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@@ -1,1356 +1,1356 @@
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-// ****************************************************************************
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-// * This file is part of the xBRZ project. It is distributed under *
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-// * GNU General Public License: https://www.gnu.org/licenses/gpl-3.0 *
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-// * Copyright (C) Zenju (zenju AT gmx DOT de) - All Rights Reserved *
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-// * *
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-// * Additionally and as a special exception, the author gives permission *
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-// * to link the code of this program with the following libraries *
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-// * (or with modified versions that use the same licenses), and distribute *
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-// * linked combinations including the two: MAME, FreeFileSync, Snes9x, ePSXe *
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-// * You must obey the GNU General Public License in all respects for all of *
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-// * the code used other than MAME, FreeFileSync, Snes9x, ePSXe. *
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-// * If you modify this file, you may extend this exception to your version *
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-// * of the file, but you are not obligated to do so. If you do not wish to *
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-// * do so, delete this exception statement from your version. *
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-// ****************************************************************************
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-
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-#include "xbrz.h"
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-#include <cassert>
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-#include <vector>
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-#include <algorithm>
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-#include <cmath> //std::sqrt
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-#include "xbrz_tools.h"
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-
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-using namespace xbrz;
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-
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-
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-namespace
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-{
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-template <unsigned int M, unsigned int N> inline
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-uint32_t gradientRGB(uint32_t pixFront, uint32_t pixBack) //blend front color with opacity M / N over opaque background: https://en.wikipedia.org/wiki/Alpha_compositing#Alpha_blending
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-{
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- static_assert(0 < M && M < N && N <= 1000);
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-
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- auto calcColor = [](unsigned char colFront, unsigned char colBack) -> unsigned char { return (colFront * M + colBack * (N - M)) / N; };
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-
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- return makePixel(calcColor(getRed (pixFront), getRed (pixBack)),
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- calcColor(getGreen(pixFront), getGreen(pixBack)),
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- calcColor(getBlue (pixFront), getBlue (pixBack)));
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-}
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-
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-
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-template <unsigned int M, unsigned int N> inline
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-uint32_t gradientARGB(uint32_t pixFront, uint32_t pixBack) //find intermediate color between two colors with alpha channels (=> NO alpha blending!!!)
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-{
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- static_assert(0 < M && M < N && N <= 1000);
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-
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- const unsigned int weightFront = getAlpha(pixFront) * M;
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- const unsigned int weightBack = getAlpha(pixBack) * (N - M);
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- const unsigned int weightSum = weightFront + weightBack;
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- if (weightSum == 0)
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- return 0;
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-
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- auto calcColor = [=](unsigned char colFront, unsigned char colBack)
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- {
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- return static_cast<unsigned char>((colFront * weightFront + colBack * weightBack) / weightSum);
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- };
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-
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- return makePixel(static_cast<unsigned char>(weightSum / N),
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- calcColor(getRed (pixFront), getRed (pixBack)),
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- calcColor(getGreen(pixFront), getGreen(pixBack)),
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- calcColor(getBlue (pixFront), getBlue (pixBack)));
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-}
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-
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-
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-//inline
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-//double fastSqrt(double n)
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-//{
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-// __asm //speeds up xBRZ by about 9% compared to std::sqrt which internally uses the same assembler instructions but adds some "fluff"
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-// {
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-// fld n
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-// fsqrt
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-// }
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-//}
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-//
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-
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-
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-#ifdef _MSC_VER
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- #define FORCE_INLINE __forceinline
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-#elif defined __GNUC__
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- #define FORCE_INLINE __attribute__((always_inline)) inline
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-#else
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- #define FORCE_INLINE inline
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-#endif
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-
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-
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-enum RotationDegree //clock-wise
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-{
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- ROT_0,
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- ROT_90,
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- ROT_180,
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- ROT_270
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-};
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-
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-//calculate input matrix coordinates after rotation at compile time
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-template <RotationDegree rotDeg, size_t I, size_t J, size_t N>
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-struct MatrixRotation;
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-
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-template <size_t I, size_t J, size_t N>
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-struct MatrixRotation<ROT_0, I, J, N>
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-{
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- static const size_t I_old = I;
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- static const size_t J_old = J;
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-};
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-
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-template <RotationDegree rotDeg, size_t I, size_t J, size_t N> //(i, j) = (row, col) indices, N = size of (square) matrix
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-struct MatrixRotation
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-{
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- static const size_t I_old = N - 1 - MatrixRotation<static_cast<RotationDegree>(rotDeg - 1), I, J, N>::J_old; //old coordinates before rotation!
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- static const size_t J_old = MatrixRotation<static_cast<RotationDegree>(rotDeg - 1), I, J, N>::I_old; //
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-};
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-
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-
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-template <size_t N, RotationDegree rotDeg>
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-class OutputMatrix
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-{
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-public:
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- OutputMatrix(uint32_t* out, int outWidth) : //access matrix area, top-left at position "out" for image with given width
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- out_(out),
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- outWidth_(outWidth) {}
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-
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- template <size_t I, size_t J>
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- uint32_t& ref() const
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- {
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- static const size_t I_old = MatrixRotation<rotDeg, I, J, N>::I_old;
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- static const size_t J_old = MatrixRotation<rotDeg, I, J, N>::J_old;
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- return *(out_ + J_old + I_old * outWidth_);
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- }
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-
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-private:
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- uint32_t* out_;
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- const int outWidth_;
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-};
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-
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-
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-template <class T> inline
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-T square(T value) { return value * value; }
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-
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-
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-#if 0
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-inline
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-double distRGB(uint32_t pix1, uint32_t pix2)
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-{
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- const double r_diff = static_cast<int>(getRed (pix1)) - getRed (pix2);
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- const double g_diff = static_cast<int>(getGreen(pix1)) - getGreen(pix2);
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- const double b_diff = static_cast<int>(getBlue (pix1)) - getBlue (pix2);
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-
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- //euklidean RGB distance
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- return std::sqrt(square(r_diff) + square(g_diff) + square(b_diff));
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-}
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-#endif
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-
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-
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-inline
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-double distYCbCr(uint32_t pix1, uint32_t pix2, double lumaWeight)
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-{
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- //https://en.wikipedia.org/wiki/YCbCr#ITU-R_BT.601_conversion
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- //YCbCr conversion is a matrix multiplication => take advantage of linearity by subtracting first!
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- const int r_diff = static_cast<int>(getRed (pix1)) - getRed (pix2); //we may delay division by 255 to after matrix multiplication
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- const int g_diff = static_cast<int>(getGreen(pix1)) - getGreen(pix2); //
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- const int b_diff = static_cast<int>(getBlue (pix1)) - getBlue (pix2); //substraction for int is noticeable faster than for double!
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-
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- //const double k_b = 0.0722; //ITU-R BT.709 conversion
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- //const double k_r = 0.2126; //
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- const double k_b = 0.0593; //ITU-R BT.2020 conversion
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- const double k_r = 0.2627; //
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- const double k_g = 1 - k_b - k_r;
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-
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- const double scale_b = 0.5 / (1 - k_b);
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- const double scale_r = 0.5 / (1 - k_r);
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-
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- const double y = k_r * r_diff + k_g * g_diff + k_b * b_diff; //[!], analog YCbCr!
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- const double c_b = scale_b * (b_diff - y);
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- const double c_r = scale_r * (r_diff - y);
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-
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- //we skip division by 255 to have similar range like other distance functions
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- return std::sqrt(square(lumaWeight * y) + square(c_b) + square(c_r));
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-}
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-
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-
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-inline
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-double distYCbCrBuffered(uint32_t pix1, uint32_t pix2)
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-{
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- //30% perf boost compared to plain distYCbCr()!
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- //consumes 64 MB memory; using double is only 2% faster, but takes 128 MB
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- static const std::vector<float> diffToDist = []
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- {
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- std::vector<float> tmp;
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-
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- for (uint32_t i = 0; i < 256 * 256 * 256; ++i) //startup time: 114 ms on Intel Core i5 (four cores)
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- {
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- const int r_diff = static_cast<signed char>(getByte<2>(i)) * 2;
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- const int g_diff = static_cast<signed char>(getByte<1>(i)) * 2;
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- const int b_diff = static_cast<signed char>(getByte<0>(i)) * 2;
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-
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- const double k_b = 0.0593; //ITU-R BT.2020 conversion
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- const double k_r = 0.2627; //
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- const double k_g = 1 - k_b - k_r;
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-
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- const double scale_b = 0.5 / (1 - k_b);
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- const double scale_r = 0.5 / (1 - k_r);
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-
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- const double y = k_r * r_diff + k_g * g_diff + k_b * b_diff; //[!], analog YCbCr!
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- const double c_b = scale_b * (b_diff - y);
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- const double c_r = scale_r * (r_diff - y);
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-
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- tmp.push_back(static_cast<float>(std::sqrt(square(y) + square(c_b) + square(c_r))));
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- }
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- return tmp;
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- }();
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-
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- //if (pix1 == pix2) -> 8% perf degradation!
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- // return 0;
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- //if (pix1 < pix2)
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- // std::swap(pix1, pix2); -> 30% perf degradation!!!
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-
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- const int r_diff = static_cast<int>(getRed (pix1)) - getRed (pix2);
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- const int g_diff = static_cast<int>(getGreen(pix1)) - getGreen(pix2);
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- const int b_diff = static_cast<int>(getBlue (pix1)) - getBlue (pix2);
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-
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- const size_t index = (static_cast<unsigned char>(r_diff / 2) << 16) | //slightly reduce precision (division by 2) to squeeze value into single byte
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- (static_cast<unsigned char>(g_diff / 2) << 8) |
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- (static_cast<unsigned char>(b_diff / 2));
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-
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-#if 0 //attention: the following calculation creates an asymmetric color distance!!! (e.g. r_diff=46 will be unpacked as 45, but r_diff=-46 unpacks to -47
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- const size_t index = (((r_diff + 0xFF) / 2) << 16) | //slightly reduce precision (division by 2) to squeeze value into single byte
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- (((g_diff + 0xFF) / 2) << 8) |
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- (( b_diff + 0xFF) / 2);
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-#endif
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- return diffToDist[index];
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-}
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-
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-
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-#if defined _MSC_VER && !defined NDEBUG
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- const int debugPixelX = -1;
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- const int debugPixelY = 58;
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-
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- thread_local bool breakIntoDebugger = false;
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-#endif
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-
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-
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-enum BlendType
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-{
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- BLEND_NONE = 0,
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- BLEND_NORMAL, //a normal indication to blend
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- BLEND_DOMINANT, //a strong indication to blend
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- //attention: BlendType must fit into the value range of 2 bit!!!
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-};
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-
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-struct BlendResult
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-{
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- BlendType
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- /**/blend_f, blend_g,
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- /**/blend_j, blend_k;
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-};
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-
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-
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-struct Kernel_3x3
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-{
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- uint32_t
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- a, b, c,
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- d, e, f,
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- g, h, i;
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-};
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-
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-struct Kernel_4x4 //kernel for preprocessing step
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-{
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- uint32_t
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- a, b, c, //
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- e, f, g, // support reinterpret_cast from Kernel_4x4 => Kernel_3x3
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- i, j, k, //
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- m, n, o,
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- d, h, l, p;
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-};
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-
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-/* input kernel area naming convention:
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------------------
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-| A | B | C | D |
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-|---|---|---|---|
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-| E | F | G | H | evaluate the four corners between F, G, J, K
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-|---|---|---|---| input pixel is at position F
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-| I | J | K | L |
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-|---|---|---|---|
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-| M | N | O | P |
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------------------
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-*/
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-template <class ColorDistance>
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-FORCE_INLINE //detect blend direction
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-BlendResult preProcessCorners(const Kernel_4x4& ker, const xbrz::ScalerCfg& cfg) //result: F, G, J, K corners of "GradientType"
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-{
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-#if defined _MSC_VER && !defined NDEBUG
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- if (breakIntoDebugger)
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- __debugbreak(); //__asm int 3;
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-#endif
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-
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- BlendResult result = {};
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-
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- if ((ker.f == ker.g &&
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- ker.j == ker.k) ||
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- (ker.f == ker.j &&
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- ker.g == ker.k))
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- return result;
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-
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- auto dist = [&](uint32_t pix1, uint32_t pix2) { return ColorDistance::dist(pix1, pix2, cfg.luminanceWeight); };
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-
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- double jg = dist(ker.i, ker.f) + dist(ker.f, ker.c) + dist(ker.n, ker.k) + dist(ker.k, ker.h) + cfg.centerDirectionBias * dist(ker.j, ker.g);
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- double fk = dist(ker.e, ker.j) + dist(ker.j, ker.o) + dist(ker.b, ker.g) + dist(ker.g, ker.l) + cfg.centerDirectionBias * dist(ker.f, ker.k);
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-
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- if (jg < fk) //test sample: 70% of values max(jg, fk) / min(jg, fk) are between 1.1 and 3.7 with median being 1.8
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- {
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- const bool dominantGradient = cfg.dominantDirectionThreshold * jg < fk;
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- if (ker.f != ker.g && ker.f != ker.j)
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- result.blend_f = dominantGradient ? BLEND_DOMINANT : BLEND_NORMAL;
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-
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- if (ker.k != ker.j && ker.k != ker.g)
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- result.blend_k = dominantGradient ? BLEND_DOMINANT : BLEND_NORMAL;
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- }
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- else if (fk < jg)
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- {
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- const bool dominantGradient = cfg.dominantDirectionThreshold * fk < jg;
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- if (ker.j != ker.f && ker.j != ker.k)
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- result.blend_j = dominantGradient ? BLEND_DOMINANT : BLEND_NORMAL;
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-
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- if (ker.g != ker.f && ker.g != ker.k)
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- result.blend_g = dominantGradient ? BLEND_DOMINANT : BLEND_NORMAL;
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- }
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- return result;
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-}
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-
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-#define DEF_GETTER(x) template <RotationDegree rotDeg> uint32_t inline get_##x(const Kernel_3x3& ker) { return ker.x; }
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-//we cannot and NEED NOT write "ker.##x" since ## concatenates preprocessor tokens but "." is not a token
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-DEF_GETTER(a) DEF_GETTER(b) DEF_GETTER(c)
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-DEF_GETTER(d) DEF_GETTER(e) DEF_GETTER(f)
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-DEF_GETTER(g) DEF_GETTER(h) DEF_GETTER(i)
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-#undef DEF_GETTER
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-
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-#define DEF_GETTER(x, y) template <> inline uint32_t get_##x<ROT_90>(const Kernel_3x3& ker) { return ker.y; }
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-DEF_GETTER(a, g) DEF_GETTER(b, d) DEF_GETTER(c, a)
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-DEF_GETTER(d, h) DEF_GETTER(e, e) DEF_GETTER(f, b)
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-DEF_GETTER(g, i) DEF_GETTER(h, f) DEF_GETTER(i, c)
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-#undef DEF_GETTER
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-
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-#define DEF_GETTER(x, y) template <> inline uint32_t get_##x<ROT_180>(const Kernel_3x3& ker) { return ker.y; }
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-DEF_GETTER(a, i) DEF_GETTER(b, h) DEF_GETTER(c, g)
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-DEF_GETTER(d, f) DEF_GETTER(e, e) DEF_GETTER(f, d)
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-DEF_GETTER(g, c) DEF_GETTER(h, b) DEF_GETTER(i, a)
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-#undef DEF_GETTER
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-
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-#define DEF_GETTER(x, y) template <> inline uint32_t get_##x<ROT_270>(const Kernel_3x3& ker) { return ker.y; }
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-DEF_GETTER(a, c) DEF_GETTER(b, f) DEF_GETTER(c, i)
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-DEF_GETTER(d, b) DEF_GETTER(e, e) DEF_GETTER(f, h)
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-DEF_GETTER(g, a) DEF_GETTER(h, d) DEF_GETTER(i, g)
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-#undef DEF_GETTER
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-
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-
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-//compress four blend types into a single byte
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-//inline BlendType getTopL (unsigned char b) { return static_cast<BlendType>(0x3 & b); }
|
|
|
-inline BlendType getTopR (unsigned char b) { return static_cast<BlendType>(0x3 & (b >> 2)); }
|
|
|
-inline BlendType getBottomR(unsigned char b) { return static_cast<BlendType>(0x3 & (b >> 4)); }
|
|
|
-inline BlendType getBottomL(unsigned char b) { return static_cast<BlendType>(0x3 & (b >> 6)); }
|
|
|
-
|
|
|
-inline void clearAddTopL(unsigned char& b, BlendType bt) { b = static_cast<unsigned char>(bt); }
|
|
|
-inline void addTopR (unsigned char& b, BlendType bt) { b |= (bt << 2); } //buffer is assumed to be initialized before preprocessing!
|
|
|
-inline void addBottomR (unsigned char& b, BlendType bt) { b |= (bt << 4); } //e.g. via clearAddTopL()
|
|
|
-inline void addBottomL (unsigned char& b, BlendType bt) { b |= (bt << 6); } //
|
|
|
-
|
|
|
-inline bool blendingNeeded(unsigned char b)
|
|
|
-{
|
|
|
- static_assert(BLEND_NONE == 0);
|
|
|
- return b != 0;
|
|
|
-}
|
|
|
-
|
|
|
-template <RotationDegree rotDeg> inline
|
|
|
-unsigned char rotateBlendInfo(unsigned char b) { return b; }
|
|
|
-template <> inline unsigned char rotateBlendInfo<ROT_90 >(unsigned char b) { return ((b << 2) | (b >> 6)) & 0xff; }
|
|
|
-template <> inline unsigned char rotateBlendInfo<ROT_180>(unsigned char b) { return ((b << 4) | (b >> 4)) & 0xff; }
|
|
|
-template <> inline unsigned char rotateBlendInfo<ROT_270>(unsigned char b) { return ((b << 6) | (b >> 2)) & 0xff; }
|
|
|
-
|
|
|
-
|
|
|
-/* input kernel area naming convention:
|
|
|
--------------
|
|
|
-| A | B | C |
|
|
|
-|---|---|---|
|
|
|
-| D | E | F | input pixel is at position E
|
|
|
-|---|---|---|
|
|
|
-| G | H | I |
|
|
|
--------------
|
|
|
-*/
|
|
|
-template <class Scaler, class ColorDistance, RotationDegree rotDeg>
|
|
|
-FORCE_INLINE //perf: quite worth it!
|
|
|
-void blendPixel(const Kernel_3x3& ker,
|
|
|
- uint32_t* target, int trgWidth,
|
|
|
- unsigned char blendInfo, //result of preprocessing all four corners of pixel "e"
|
|
|
- const xbrz::ScalerCfg& cfg)
|
|
|
-{
|
|
|
- //#define a get_a<rotDeg>(ker)
|
|
|
-#define b get_b<rotDeg>(ker)
|
|
|
-#define c get_c<rotDeg>(ker)
|
|
|
-#define d get_d<rotDeg>(ker)
|
|
|
-#define e get_e<rotDeg>(ker)
|
|
|
-#define f get_f<rotDeg>(ker)
|
|
|
-#define g get_g<rotDeg>(ker)
|
|
|
-#define h get_h<rotDeg>(ker)
|
|
|
-#define i get_i<rotDeg>(ker)
|
|
|
-
|
|
|
-#if defined _MSC_VER && !defined NDEBUG
|
|
|
- if (breakIntoDebugger)
|
|
|
- __debugbreak(); //__asm int 3;
|
|
|
-#endif
|
|
|
-
|
|
|
- const unsigned char blend = rotateBlendInfo<rotDeg>(blendInfo);
|
|
|
-
|
|
|
- if (getBottomR(blend) >= BLEND_NORMAL)
|
|
|
- {
|
|
|
- auto eq = [&](uint32_t pix1, uint32_t pix2) { return ColorDistance::dist(pix1, pix2, cfg.luminanceWeight) < cfg.equalColorTolerance; };
|
|
|
- auto dist = [&](uint32_t pix1, uint32_t pix2) { return ColorDistance::dist(pix1, pix2, cfg.luminanceWeight); };
|
|
|
-
|
|
|
- const bool doLineBlend = [&]() -> bool
|
|
|
- {
|
|
|
- if (getBottomR(blend) >= BLEND_DOMINANT)
|
|
|
- return true;
|
|
|
-
|
|
|
- //make sure there is no second blending in an adjacent rotation for this pixel: handles insular pixels, mario eyes
|
|
|
- if (getTopR(blend) != BLEND_NONE && !eq(e, g)) //but support double-blending for 90° corners
|
|
|
- return false;
|
|
|
- if (getBottomL(blend) != BLEND_NONE && !eq(e, c))
|
|
|
- return false;
|
|
|
-
|
|
|
- //no full blending for L-shapes; blend corner only (handles "mario mushroom eyes")
|
|
|
- if (!eq(e, i) && eq(g, h) && eq(h, i) && eq(i, f) && eq(f, c))
|
|
|
- return false;
|
|
|
-
|
|
|
- return true;
|
|
|
- }();
|
|
|
-
|
|
|
- const uint32_t px = dist(e, f) <= dist(e, h) ? f : h; //choose most similar color
|
|
|
-
|
|
|
- OutputMatrix<Scaler::scale, rotDeg> out(target, trgWidth);
|
|
|
-
|
|
|
- if (doLineBlend)
|
|
|
- {
|
|
|
- const double fg = dist(f, g); //test sample: 70% of values max(fg, hc) / min(fg, hc) are between 1.1 and 3.7 with median being 1.9
|
|
|
- const double hc = dist(h, c); //
|
|
|
-
|
|
|
- const bool haveShallowLine = cfg.steepDirectionThreshold * fg <= hc && e != g && d != g;
|
|
|
- const bool haveSteepLine = cfg.steepDirectionThreshold * hc <= fg && e != c && b != c;
|
|
|
-
|
|
|
- if (haveShallowLine)
|
|
|
- {
|
|
|
- if (haveSteepLine)
|
|
|
- Scaler::blendLineSteepAndShallow(px, out);
|
|
|
- else
|
|
|
- Scaler::blendLineShallow(px, out);
|
|
|
- }
|
|
|
- else
|
|
|
- {
|
|
|
- if (haveSteepLine)
|
|
|
- Scaler::blendLineSteep(px, out);
|
|
|
- else
|
|
|
- Scaler::blendLineDiagonal(px, out);
|
|
|
- }
|
|
|
- }
|
|
|
- else
|
|
|
- Scaler::blendCorner(px, out);
|
|
|
- }
|
|
|
-
|
|
|
- //#undef a
|
|
|
-#undef b
|
|
|
-#undef c
|
|
|
-#undef d
|
|
|
-#undef e
|
|
|
-#undef f
|
|
|
-#undef g
|
|
|
-#undef h
|
|
|
-#undef i
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-class OobReaderTransparent
|
|
|
-{
|
|
|
-public:
|
|
|
- OobReaderTransparent(const uint32_t* src, int srcWidth, int srcHeight, int y) :
|
|
|
- s_m1(0 <= y - 1 && y - 1 < srcHeight ? src + srcWidth * (y - 1) : nullptr),
|
|
|
- s_0 (0 <= y && y < srcHeight ? src + srcWidth * y : nullptr),
|
|
|
- s_p1(0 <= y + 1 && y + 1 < srcHeight ? src + srcWidth * (y + 1) : nullptr),
|
|
|
- s_p2(0 <= y + 2 && y + 2 < srcHeight ? src + srcWidth * (y + 2) : nullptr),
|
|
|
- srcWidth_(srcWidth) {}
|
|
|
-
|
|
|
- void readDhlp(Kernel_4x4& ker, int x) const //(x, y) is at kernel position F
|
|
|
- {
|
|
|
- [[likely]] if (const int x_p2 = x + 2; 0 <= x_p2 && x_p2 < srcWidth_)
|
|
|
- {
|
|
|
- ker.d = s_m1 ? s_m1[x_p2] : 0;
|
|
|
- ker.h = s_0 ? s_0 [x_p2] : 0;
|
|
|
- ker.l = s_p1 ? s_p1[x_p2] : 0;
|
|
|
- ker.p = s_p2 ? s_p2[x_p2] : 0;
|
|
|
- }
|
|
|
- else
|
|
|
- {
|
|
|
- ker.d = 0;
|
|
|
- ker.h = 0;
|
|
|
- ker.l = 0;
|
|
|
- ker.p = 0;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
-private:
|
|
|
- const uint32_t* const s_m1;
|
|
|
- const uint32_t* const s_0;
|
|
|
- const uint32_t* const s_p1;
|
|
|
- const uint32_t* const s_p2;
|
|
|
- const int srcWidth_;
|
|
|
-};
|
|
|
-
|
|
|
-
|
|
|
-class OobReaderDuplicate
|
|
|
-{
|
|
|
-public:
|
|
|
- OobReaderDuplicate(const uint32_t* src, int srcWidth, int srcHeight, int y) :
|
|
|
- s_m1(src + srcWidth * std::clamp(y - 1, 0, srcHeight - 1)),
|
|
|
- s_0 (src + srcWidth * std::clamp(y, 0, srcHeight - 1)),
|
|
|
- s_p1(src + srcWidth * std::clamp(y + 1, 0, srcHeight - 1)),
|
|
|
- s_p2(src + srcWidth * std::clamp(y + 2, 0, srcHeight - 1)),
|
|
|
- srcWidth_(srcWidth) {}
|
|
|
-
|
|
|
- void readDhlp(Kernel_4x4& ker, int x) const //(x, y) is at kernel position F
|
|
|
- {
|
|
|
- const int x_p2 = std::clamp(x + 2, 0, srcWidth_ - 1);
|
|
|
- ker.d = s_m1[x_p2];
|
|
|
- ker.h = s_0 [x_p2];
|
|
|
- ker.l = s_p1[x_p2];
|
|
|
- ker.p = s_p2[x_p2];
|
|
|
- }
|
|
|
-
|
|
|
-private:
|
|
|
- const uint32_t* const s_m1;
|
|
|
- const uint32_t* const s_0;
|
|
|
- const uint32_t* const s_p1;
|
|
|
- const uint32_t* const s_p2;
|
|
|
- const int srcWidth_;
|
|
|
-};
|
|
|
-
|
|
|
-
|
|
|
-template <class Scaler, class ColorDistance, class OobReader> //scaler policy: see "Scaler2x" reference implementation
|
|
|
-void scaleImage(const uint32_t* src, uint32_t* trg, int srcWidth, int srcHeight, const xbrz::ScalerCfg& cfg, int yFirst, int yLast)
|
|
|
-{
|
|
|
- yFirst = std::max(yFirst, 0);
|
|
|
- yLast = std::min(yLast, srcHeight);
|
|
|
- if (yFirst >= yLast || srcWidth <= 0)
|
|
|
- return;
|
|
|
-
|
|
|
- const int trgWidth = srcWidth * Scaler::scale;
|
|
|
-
|
|
|
- //(ab)use space of "sizeof(uint32_t) * srcWidth * Scaler::scale" at the end of the image as temporary
|
|
|
- //buffer for "on the fly preprocessing" without risk of accidental overwriting before accessing
|
|
|
- unsigned char* const preProcBuf = reinterpret_cast<unsigned char*>(trg + yLast * Scaler::scale * trgWidth) - srcWidth;
|
|
|
-
|
|
|
- //initialize preprocessing buffer for first row of current stripe: detect upper left and right corner blending
|
|
|
- //this cannot be optimized for adjacent processing stripes; we must not allow for a memory race condition!
|
|
|
- {
|
|
|
- const OobReader oobReader(src, srcWidth, srcHeight, yFirst - 1);
|
|
|
-
|
|
|
- //initialize at position x = -1
|
|
|
- Kernel_4x4 ker4 = {};
|
|
|
- oobReader.readDhlp(ker4, -4); //hack: read a, e, i, m at x = -1
|
|
|
- ker4.a = ker4.d;
|
|
|
- ker4.e = ker4.h;
|
|
|
- ker4.i = ker4.l;
|
|
|
- ker4.m = ker4.p;
|
|
|
-
|
|
|
- oobReader.readDhlp(ker4, -3);
|
|
|
- ker4.b = ker4.d;
|
|
|
- ker4.f = ker4.h;
|
|
|
- ker4.j = ker4.l;
|
|
|
- ker4.n = ker4.p;
|
|
|
-
|
|
|
- oobReader.readDhlp(ker4, -2);
|
|
|
- ker4.c = ker4.d;
|
|
|
- ker4.g = ker4.h;
|
|
|
- ker4.k = ker4.l;
|
|
|
- ker4.o = ker4.p;
|
|
|
-
|
|
|
- oobReader.readDhlp(ker4, -1);
|
|
|
-
|
|
|
- {
|
|
|
- const BlendResult res = preProcessCorners<ColorDistance>(ker4, cfg);
|
|
|
- clearAddTopL(preProcBuf[0], res.blend_k); //set 1st known corner for (0, yFirst)
|
|
|
- }
|
|
|
-
|
|
|
- for (int x = 0; x < srcWidth; ++x)
|
|
|
- {
|
|
|
- ker4.a = ker4.b; //shift previous kernel to the left
|
|
|
- ker4.e = ker4.f; // -----------------
|
|
|
- ker4.i = ker4.j; // | A | B | C | D |
|
|
|
- ker4.m = ker4.n; // |---|---|---|---|
|
|
|
- /**/ // | E | F | G | H | (x, yFirst - 1) is at position F
|
|
|
- ker4.b = ker4.c; // |---|---|---|---|
|
|
|
- ker4.f = ker4.g; // | I | J | K | L |
|
|
|
- ker4.j = ker4.k; // |---|---|---|---|
|
|
|
- ker4.n = ker4.o; // | M | N | O | P |
|
|
|
- /**/ // -----------------
|
|
|
- ker4.c = ker4.d;
|
|
|
- ker4.g = ker4.h;
|
|
|
- ker4.k = ker4.l;
|
|
|
- ker4.o = ker4.p;
|
|
|
-
|
|
|
- oobReader.readDhlp(ker4, x);
|
|
|
-
|
|
|
- /* preprocessing blend result:
|
|
|
- ---------
|
|
|
- | F | G | evaluate corner between F, G, J, K
|
|
|
- |---+---| current input pixel is at position F
|
|
|
- | J | K |
|
|
|
- --------- */
|
|
|
- const BlendResult res = preProcessCorners<ColorDistance>(ker4, cfg);
|
|
|
- addTopR(preProcBuf[x], res.blend_j); //set 2nd known corner for (x, yFirst)
|
|
|
-
|
|
|
- if (x + 1 < srcWidth)
|
|
|
- clearAddTopL(preProcBuf[x + 1], res.blend_k); //set 1st known corner for (x + 1, yFirst)
|
|
|
- }
|
|
|
- }
|
|
|
- //------------------------------------------------------------------------------------
|
|
|
-
|
|
|
- for (int y = yFirst; y < yLast; ++y)
|
|
|
- {
|
|
|
- uint32_t* out = trg + Scaler::scale * y * trgWidth; //consider MT "striped" access
|
|
|
-
|
|
|
- const OobReader oobReader(src, srcWidth, srcHeight, y);
|
|
|
-
|
|
|
- //initialize at position x = -1
|
|
|
- Kernel_4x4 ker4 = {};
|
|
|
- oobReader.readDhlp(ker4, -4); //hack: read a, e, i, m at x = -1
|
|
|
- ker4.a = ker4.d;
|
|
|
- ker4.e = ker4.h;
|
|
|
- ker4.i = ker4.l;
|
|
|
- ker4.m = ker4.p;
|
|
|
-
|
|
|
- oobReader.readDhlp(ker4, -3);
|
|
|
- ker4.b = ker4.d;
|
|
|
- ker4.f = ker4.h;
|
|
|
- ker4.j = ker4.l;
|
|
|
- ker4.n = ker4.p;
|
|
|
-
|
|
|
- oobReader.readDhlp(ker4, -2);
|
|
|
- ker4.c = ker4.d;
|
|
|
- ker4.g = ker4.h;
|
|
|
- ker4.k = ker4.l;
|
|
|
- ker4.o = ker4.p;
|
|
|
-
|
|
|
- oobReader.readDhlp(ker4, -1);
|
|
|
-
|
|
|
- unsigned char blend_xy1 = 0; //corner blending for current (x, y + 1) position
|
|
|
- {
|
|
|
- const BlendResult res = preProcessCorners<ColorDistance>(ker4, cfg);
|
|
|
- clearAddTopL(blend_xy1, res.blend_k); //set 1st known corner for (0, y + 1) and buffer for use on next column
|
|
|
-
|
|
|
- addBottomL(preProcBuf[0], res.blend_g); //set 3rd known corner for (0, y)
|
|
|
- }
|
|
|
-
|
|
|
- for (int x = 0; x < srcWidth; ++x, out += Scaler::scale)
|
|
|
- {
|
|
|
-#if defined _MSC_VER && !defined NDEBUG
|
|
|
- breakIntoDebugger = debugPixelX == x && debugPixelY == y;
|
|
|
-#endif
|
|
|
- ker4.a = ker4.b; //shift previous kernel to the left
|
|
|
- ker4.e = ker4.f; // -----------------
|
|
|
- ker4.i = ker4.j; // | A | B | C | D |
|
|
|
- ker4.m = ker4.n; // |---|---|---|---|
|
|
|
- /**/ // | E | F | G | H | (x, y) is at position F
|
|
|
- ker4.b = ker4.c; // |---|---|---|---|
|
|
|
- ker4.f = ker4.g; // | I | J | K | L |
|
|
|
- ker4.j = ker4.k; // |---|---|---|---|
|
|
|
- ker4.n = ker4.o; // | M | N | O | P |
|
|
|
- /**/ // -----------------
|
|
|
- ker4.c = ker4.d;
|
|
|
- ker4.g = ker4.h;
|
|
|
- ker4.k = ker4.l;
|
|
|
- ker4.o = ker4.p;
|
|
|
-
|
|
|
- oobReader.readDhlp(ker4, x);
|
|
|
-
|
|
|
- //evaluate the four corners on bottom-right of current pixel
|
|
|
- unsigned char blend_xy = preProcBuf[x]; //for current (x, y) position
|
|
|
- {
|
|
|
- /* preprocessing blend result:
|
|
|
- ---------
|
|
|
- | F | G | evaluate corner between F, G, J, K
|
|
|
- |---+---| current input pixel is at position F
|
|
|
- | J | K |
|
|
|
- --------- */
|
|
|
- const BlendResult res = preProcessCorners<ColorDistance>(ker4, cfg);
|
|
|
- addBottomR(blend_xy, res.blend_f); //all four corners of (x, y) have been determined at this point due to processing sequence!
|
|
|
-
|
|
|
- addTopR(blend_xy1, res.blend_j); //set 2nd known corner for (x, y + 1)
|
|
|
- preProcBuf[x] = blend_xy1; //store on current buffer position for use on next row
|
|
|
-
|
|
|
- [[likely]] if (x + 1 < srcWidth)
|
|
|
- {
|
|
|
- //blend_xy1 -> blend_x1y1
|
|
|
- clearAddTopL(blend_xy1, res.blend_k); //set 1st known corner for (x + 1, y + 1) and buffer for use on next column
|
|
|
-
|
|
|
- addBottomL(preProcBuf[x + 1], res.blend_g); //set 3rd known corner for (x + 1, y)
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- //fill block of size scale * scale with the given color
|
|
|
- fillBlock(out, trgWidth * sizeof(uint32_t), ker4.f, Scaler::scale, Scaler::scale);
|
|
|
- //place *after* preprocessing step, to not overwrite the results while processing the last pixel!
|
|
|
-
|
|
|
- //blend all four corners of current pixel
|
|
|
- if (blendingNeeded(blend_xy))
|
|
|
- {
|
|
|
- const auto& ker3 = reinterpret_cast<const Kernel_3x3&>(ker4); //"The Things We Do for Perf"
|
|
|
- blendPixel<Scaler, ColorDistance, ROT_0 >(ker3, out, trgWidth, blend_xy, cfg);
|
|
|
- blendPixel<Scaler, ColorDistance, ROT_90 >(ker3, out, trgWidth, blend_xy, cfg);
|
|
|
- blendPixel<Scaler, ColorDistance, ROT_180>(ker3, out, trgWidth, blend_xy, cfg);
|
|
|
- blendPixel<Scaler, ColorDistance, ROT_270>(ker3, out, trgWidth, blend_xy, cfg);
|
|
|
- }
|
|
|
- }
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-//------------------------------------------------------------------------------------
|
|
|
-
|
|
|
-template <class ColorGradient>
|
|
|
-struct Scaler2x : public ColorGradient
|
|
|
-{
|
|
|
- static const int scale = 2;
|
|
|
-
|
|
|
- template <unsigned int M, unsigned int N> //bring template function into scope for GCC
|
|
|
- static void alphaGrad(uint32_t& pixBack, uint32_t pixFront) { ColorGradient::template alphaGrad<M, N>(pixBack, pixFront); }
|
|
|
-
|
|
|
-
|
|
|
- template <class OutputMatrix>
|
|
|
- static void blendLineShallow(uint32_t col, OutputMatrix& out)
|
|
|
- {
|
|
|
- alphaGrad<1, 4>(out.template ref<scale - 1, 0>(), col);
|
|
|
- alphaGrad<3, 4>(out.template ref<scale - 1, 1>(), col);
|
|
|
- }
|
|
|
-
|
|
|
- template <class OutputMatrix>
|
|
|
- static void blendLineSteep(uint32_t col, OutputMatrix& out)
|
|
|
- {
|
|
|
- alphaGrad<1, 4>(out.template ref<0, scale - 1>(), col);
|
|
|
- alphaGrad<3, 4>(out.template ref<1, scale - 1>(), col);
|
|
|
- }
|
|
|
-
|
|
|
- template <class OutputMatrix>
|
|
|
- static void blendLineSteepAndShallow(uint32_t col, OutputMatrix& out)
|
|
|
- {
|
|
|
- alphaGrad<1, 4>(out.template ref<1, 0>(), col);
|
|
|
- alphaGrad<1, 4>(out.template ref<0, 1>(), col);
|
|
|
- alphaGrad<5, 6>(out.template ref<1, 1>(), col); //[!] fixes 7/8 used in xBR
|
|
|
- }
|
|
|
-
|
|
|
- template <class OutputMatrix>
|
|
|
- static void blendLineDiagonal(uint32_t col, OutputMatrix& out)
|
|
|
- {
|
|
|
- alphaGrad<1, 2>(out.template ref<1, 1>(), col);
|
|
|
- }
|
|
|
-
|
|
|
- template <class OutputMatrix>
|
|
|
- static void blendCorner(uint32_t col, OutputMatrix& out)
|
|
|
- {
|
|
|
- //model a round corner
|
|
|
- alphaGrad<21, 100>(out.template ref<1, 1>(), col); //exact: 1 - pi/4 = 0.2146018366
|
|
|
- }
|
|
|
-};
|
|
|
-
|
|
|
-
|
|
|
-template <class ColorGradient>
|
|
|
-struct Scaler3x : public ColorGradient
|
|
|
-{
|
|
|
- static const int scale = 3;
|
|
|
-
|
|
|
- template <unsigned int M, unsigned int N> //bring template function into scope for GCC
|
|
|
- static void alphaGrad(uint32_t& pixBack, uint32_t pixFront) { ColorGradient::template alphaGrad<M, N>(pixBack, pixFront); }
|
|
|
-
|
|
|
-
|
|
|
- template <class OutputMatrix>
|
|
|
- static void blendLineShallow(uint32_t col, OutputMatrix& out)
|
|
|
- {
|
|
|
- alphaGrad<1, 4>(out.template ref<scale - 1, 0>(), col);
|
|
|
- alphaGrad<1, 4>(out.template ref<scale - 2, 2>(), col);
|
|
|
-
|
|
|
- alphaGrad<3, 4>(out.template ref<scale - 1, 1>(), col);
|
|
|
- out.template ref<scale - 1, 2>() = col;
|
|
|
- }
|
|
|
-
|
|
|
- template <class OutputMatrix>
|
|
|
- static void blendLineSteep(uint32_t col, OutputMatrix& out)
|
|
|
- {
|
|
|
- alphaGrad<1, 4>(out.template ref<0, scale - 1>(), col);
|
|
|
- alphaGrad<1, 4>(out.template ref<2, scale - 2>(), col);
|
|
|
-
|
|
|
- alphaGrad<3, 4>(out.template ref<1, scale - 1>(), col);
|
|
|
- out.template ref<2, scale - 1>() = col;
|
|
|
- }
|
|
|
-
|
|
|
- template <class OutputMatrix>
|
|
|
- static void blendLineSteepAndShallow(uint32_t col, OutputMatrix& out)
|
|
|
- {
|
|
|
- alphaGrad<1, 4>(out.template ref<2, 0>(), col);
|
|
|
- alphaGrad<1, 4>(out.template ref<0, 2>(), col);
|
|
|
- alphaGrad<3, 4>(out.template ref<2, 1>(), col);
|
|
|
- alphaGrad<3, 4>(out.template ref<1, 2>(), col);
|
|
|
- out.template ref<2, 2>() = col;
|
|
|
- }
|
|
|
-
|
|
|
- template <class OutputMatrix>
|
|
|
- static void blendLineDiagonal(uint32_t col, OutputMatrix& out)
|
|
|
- {
|
|
|
- alphaGrad<1, 8>(out.template ref<1, 2>(), col); //conflict with other rotations for this odd scale
|
|
|
- alphaGrad<1, 8>(out.template ref<2, 1>(), col);
|
|
|
- alphaGrad<7, 8>(out.template ref<2, 2>(), col); //
|
|
|
- }
|
|
|
-
|
|
|
- template <class OutputMatrix>
|
|
|
- static void blendCorner(uint32_t col, OutputMatrix& out)
|
|
|
- {
|
|
|
- //model a round corner
|
|
|
- alphaGrad<45, 100>(out.template ref<2, 2>(), col); //exact: 0.4545939598
|
|
|
- //alphaGrad<7, 256>(out.template ref<2, 1>(), col); //0.02826017254 -> negligible + avoid conflicts with other rotations for this odd scale
|
|
|
- //alphaGrad<7, 256>(out.template ref<1, 2>(), col); //0.02826017254
|
|
|
- }
|
|
|
-};
|
|
|
-
|
|
|
-
|
|
|
-template <class ColorGradient>
|
|
|
-struct Scaler4x : public ColorGradient
|
|
|
-{
|
|
|
- static const int scale = 4;
|
|
|
-
|
|
|
- template <unsigned int M, unsigned int N> //bring template function into scope for GCC
|
|
|
- static void alphaGrad(uint32_t& pixBack, uint32_t pixFront) { ColorGradient::template alphaGrad<M, N>(pixBack, pixFront); }
|
|
|
-
|
|
|
-
|
|
|
- template <class OutputMatrix>
|
|
|
- static void blendLineShallow(uint32_t col, OutputMatrix& out)
|
|
|
- {
|
|
|
- alphaGrad<1, 4>(out.template ref<scale - 1, 0>(), col);
|
|
|
- alphaGrad<1, 4>(out.template ref<scale - 2, 2>(), col);
|
|
|
-
|
|
|
- alphaGrad<3, 4>(out.template ref<scale - 1, 1>(), col);
|
|
|
- alphaGrad<3, 4>(out.template ref<scale - 2, 3>(), col);
|
|
|
-
|
|
|
- out.template ref<scale - 1, 2>() = col;
|
|
|
- out.template ref<scale - 1, 3>() = col;
|
|
|
- }
|
|
|
-
|
|
|
- template <class OutputMatrix>
|
|
|
- static void blendLineSteep(uint32_t col, OutputMatrix& out)
|
|
|
- {
|
|
|
- alphaGrad<1, 4>(out.template ref<0, scale - 1>(), col);
|
|
|
- alphaGrad<1, 4>(out.template ref<2, scale - 2>(), col);
|
|
|
-
|
|
|
- alphaGrad<3, 4>(out.template ref<1, scale - 1>(), col);
|
|
|
- alphaGrad<3, 4>(out.template ref<3, scale - 2>(), col);
|
|
|
-
|
|
|
- out.template ref<2, scale - 1>() = col;
|
|
|
- out.template ref<3, scale - 1>() = col;
|
|
|
- }
|
|
|
-
|
|
|
- template <class OutputMatrix>
|
|
|
- static void blendLineSteepAndShallow(uint32_t col, OutputMatrix& out)
|
|
|
- {
|
|
|
- alphaGrad<3, 4>(out.template ref<3, 1>(), col);
|
|
|
- alphaGrad<3, 4>(out.template ref<1, 3>(), col);
|
|
|
- alphaGrad<1, 4>(out.template ref<3, 0>(), col);
|
|
|
- alphaGrad<1, 4>(out.template ref<0, 3>(), col);
|
|
|
-
|
|
|
- alphaGrad<1, 3>(out.template ref<2, 2>(), col); //[!] fixes 1/4 used in xBR
|
|
|
-
|
|
|
- out.template ref<3, 3>() = col;
|
|
|
- out.template ref<3, 2>() = col;
|
|
|
- out.template ref<2, 3>() = col;
|
|
|
- }
|
|
|
-
|
|
|
- template <class OutputMatrix>
|
|
|
- static void blendLineDiagonal(uint32_t col, OutputMatrix& out)
|
|
|
- {
|
|
|
- alphaGrad<1, 2>(out.template ref<scale - 1, scale / 2 >(), col);
|
|
|
- alphaGrad<1, 2>(out.template ref<scale - 2, scale / 2 + 1>(), col);
|
|
|
- out.template ref<scale - 1, scale - 1>() = col;
|
|
|
- }
|
|
|
-
|
|
|
- template <class OutputMatrix>
|
|
|
- static void blendCorner(uint32_t col, OutputMatrix& out)
|
|
|
- {
|
|
|
- //model a round corner
|
|
|
- alphaGrad<68, 100>(out.template ref<3, 3>(), col); //exact: 0.6848532563
|
|
|
- alphaGrad< 9, 100>(out.template ref<3, 2>(), col); //0.08677704501
|
|
|
- alphaGrad< 9, 100>(out.template ref<2, 3>(), col); //0.08677704501
|
|
|
- }
|
|
|
-};
|
|
|
-
|
|
|
-
|
|
|
-template <class ColorGradient>
|
|
|
-struct Scaler5x : public ColorGradient
|
|
|
-{
|
|
|
- static const int scale = 5;
|
|
|
-
|
|
|
- template <unsigned int M, unsigned int N> //bring template function into scope for GCC
|
|
|
- static void alphaGrad(uint32_t& pixBack, uint32_t pixFront) { ColorGradient::template alphaGrad<M, N>(pixBack, pixFront); }
|
|
|
-
|
|
|
-
|
|
|
- template <class OutputMatrix>
|
|
|
- static void blendLineShallow(uint32_t col, OutputMatrix& out)
|
|
|
- {
|
|
|
- alphaGrad<1, 4>(out.template ref<scale - 1, 0>(), col);
|
|
|
- alphaGrad<1, 4>(out.template ref<scale - 2, 2>(), col);
|
|
|
- alphaGrad<1, 4>(out.template ref<scale - 3, 4>(), col);
|
|
|
-
|
|
|
- alphaGrad<3, 4>(out.template ref<scale - 1, 1>(), col);
|
|
|
- alphaGrad<3, 4>(out.template ref<scale - 2, 3>(), col);
|
|
|
-
|
|
|
- out.template ref<scale - 1, 2>() = col;
|
|
|
- out.template ref<scale - 1, 3>() = col;
|
|
|
- out.template ref<scale - 1, 4>() = col;
|
|
|
- out.template ref<scale - 2, 4>() = col;
|
|
|
- }
|
|
|
-
|
|
|
- template <class OutputMatrix>
|
|
|
- static void blendLineSteep(uint32_t col, OutputMatrix& out)
|
|
|
- {
|
|
|
- alphaGrad<1, 4>(out.template ref<0, scale - 1>(), col);
|
|
|
- alphaGrad<1, 4>(out.template ref<2, scale - 2>(), col);
|
|
|
- alphaGrad<1, 4>(out.template ref<4, scale - 3>(), col);
|
|
|
-
|
|
|
- alphaGrad<3, 4>(out.template ref<1, scale - 1>(), col);
|
|
|
- alphaGrad<3, 4>(out.template ref<3, scale - 2>(), col);
|
|
|
-
|
|
|
- out.template ref<2, scale - 1>() = col;
|
|
|
- out.template ref<3, scale - 1>() = col;
|
|
|
- out.template ref<4, scale - 1>() = col;
|
|
|
- out.template ref<4, scale - 2>() = col;
|
|
|
- }
|
|
|
-
|
|
|
- template <class OutputMatrix>
|
|
|
- static void blendLineSteepAndShallow(uint32_t col, OutputMatrix& out)
|
|
|
- {
|
|
|
- alphaGrad<1, 4>(out.template ref<0, scale - 1>(), col);
|
|
|
- alphaGrad<1, 4>(out.template ref<2, scale - 2>(), col);
|
|
|
- alphaGrad<3, 4>(out.template ref<1, scale - 1>(), col);
|
|
|
-
|
|
|
- alphaGrad<1, 4>(out.template ref<scale - 1, 0>(), col);
|
|
|
- alphaGrad<1, 4>(out.template ref<scale - 2, 2>(), col);
|
|
|
- alphaGrad<3, 4>(out.template ref<scale - 1, 1>(), col);
|
|
|
-
|
|
|
- alphaGrad<2, 3>(out.template ref<3, 3>(), col);
|
|
|
-
|
|
|
- out.template ref<2, scale - 1>() = col;
|
|
|
- out.template ref<3, scale - 1>() = col;
|
|
|
- out.template ref<4, scale - 1>() = col;
|
|
|
-
|
|
|
- out.template ref<scale - 1, 2>() = col;
|
|
|
- out.template ref<scale - 1, 3>() = col;
|
|
|
- }
|
|
|
-
|
|
|
- template <class OutputMatrix>
|
|
|
- static void blendLineDiagonal(uint32_t col, OutputMatrix& out)
|
|
|
- {
|
|
|
- alphaGrad<1, 8>(out.template ref<scale - 1, scale / 2 >(), col); //conflict with other rotations for this odd scale
|
|
|
- alphaGrad<1, 8>(out.template ref<scale - 2, scale / 2 + 1>(), col);
|
|
|
- alphaGrad<1, 8>(out.template ref<scale - 3, scale / 2 + 2>(), col); //
|
|
|
-
|
|
|
- alphaGrad<7, 8>(out.template ref<4, 3>(), col);
|
|
|
- alphaGrad<7, 8>(out.template ref<3, 4>(), col);
|
|
|
-
|
|
|
- out.template ref<4, 4>() = col;
|
|
|
- }
|
|
|
-
|
|
|
- template <class OutputMatrix>
|
|
|
- static void blendCorner(uint32_t col, OutputMatrix& out)
|
|
|
- {
|
|
|
- //model a round corner
|
|
|
- alphaGrad<86, 100>(out.template ref<4, 4>(), col); //exact: 0.8631434088
|
|
|
- alphaGrad<23, 100>(out.template ref<4, 3>(), col); //0.2306749731
|
|
|
- alphaGrad<23, 100>(out.template ref<3, 4>(), col); //0.2306749731
|
|
|
- //alphaGrad<1, 64>(out.template ref<4, 2>(), col); //0.01676812367 -> negligible + avoid conflicts with other rotations for this odd scale
|
|
|
- //alphaGrad<1, 64>(out.template ref<2, 4>(), col); //0.01676812367
|
|
|
- }
|
|
|
-};
|
|
|
-
|
|
|
-
|
|
|
-template <class ColorGradient>
|
|
|
-struct Scaler6x : public ColorGradient
|
|
|
-{
|
|
|
- static const int scale = 6;
|
|
|
-
|
|
|
- template <unsigned int M, unsigned int N> //bring template function into scope for GCC
|
|
|
- static void alphaGrad(uint32_t& pixBack, uint32_t pixFront) { ColorGradient::template alphaGrad<M, N>(pixBack, pixFront); }
|
|
|
-
|
|
|
-
|
|
|
- template <class OutputMatrix>
|
|
|
- static void blendLineShallow(uint32_t col, OutputMatrix& out)
|
|
|
- {
|
|
|
- alphaGrad<1, 4>(out.template ref<scale - 1, 0>(), col);
|
|
|
- alphaGrad<1, 4>(out.template ref<scale - 2, 2>(), col);
|
|
|
- alphaGrad<1, 4>(out.template ref<scale - 3, 4>(), col);
|
|
|
-
|
|
|
- alphaGrad<3, 4>(out.template ref<scale - 1, 1>(), col);
|
|
|
- alphaGrad<3, 4>(out.template ref<scale - 2, 3>(), col);
|
|
|
- alphaGrad<3, 4>(out.template ref<scale - 3, 5>(), col);
|
|
|
-
|
|
|
- out.template ref<scale - 1, 2>() = col;
|
|
|
- out.template ref<scale - 1, 3>() = col;
|
|
|
- out.template ref<scale - 1, 4>() = col;
|
|
|
- out.template ref<scale - 1, 5>() = col;
|
|
|
-
|
|
|
- out.template ref<scale - 2, 4>() = col;
|
|
|
- out.template ref<scale - 2, 5>() = col;
|
|
|
- }
|
|
|
-
|
|
|
- template <class OutputMatrix>
|
|
|
- static void blendLineSteep(uint32_t col, OutputMatrix& out)
|
|
|
- {
|
|
|
- alphaGrad<1, 4>(out.template ref<0, scale - 1>(), col);
|
|
|
- alphaGrad<1, 4>(out.template ref<2, scale - 2>(), col);
|
|
|
- alphaGrad<1, 4>(out.template ref<4, scale - 3>(), col);
|
|
|
-
|
|
|
- alphaGrad<3, 4>(out.template ref<1, scale - 1>(), col);
|
|
|
- alphaGrad<3, 4>(out.template ref<3, scale - 2>(), col);
|
|
|
- alphaGrad<3, 4>(out.template ref<5, scale - 3>(), col);
|
|
|
-
|
|
|
- out.template ref<2, scale - 1>() = col;
|
|
|
- out.template ref<3, scale - 1>() = col;
|
|
|
- out.template ref<4, scale - 1>() = col;
|
|
|
- out.template ref<5, scale - 1>() = col;
|
|
|
-
|
|
|
- out.template ref<4, scale - 2>() = col;
|
|
|
- out.template ref<5, scale - 2>() = col;
|
|
|
- }
|
|
|
-
|
|
|
- template <class OutputMatrix>
|
|
|
- static void blendLineSteepAndShallow(uint32_t col, OutputMatrix& out)
|
|
|
- {
|
|
|
- alphaGrad<1, 4>(out.template ref<0, scale - 1>(), col);
|
|
|
- alphaGrad<1, 4>(out.template ref<2, scale - 2>(), col);
|
|
|
- alphaGrad<3, 4>(out.template ref<1, scale - 1>(), col);
|
|
|
- alphaGrad<3, 4>(out.template ref<3, scale - 2>(), col);
|
|
|
-
|
|
|
- alphaGrad<1, 4>(out.template ref<scale - 1, 0>(), col);
|
|
|
- alphaGrad<1, 4>(out.template ref<scale - 2, 2>(), col);
|
|
|
- alphaGrad<3, 4>(out.template ref<scale - 1, 1>(), col);
|
|
|
- alphaGrad<3, 4>(out.template ref<scale - 2, 3>(), col);
|
|
|
-
|
|
|
- out.template ref<2, scale - 1>() = col;
|
|
|
- out.template ref<3, scale - 1>() = col;
|
|
|
- out.template ref<4, scale - 1>() = col;
|
|
|
- out.template ref<5, scale - 1>() = col;
|
|
|
-
|
|
|
- out.template ref<4, scale - 2>() = col;
|
|
|
- out.template ref<5, scale - 2>() = col;
|
|
|
-
|
|
|
- out.template ref<scale - 1, 2>() = col;
|
|
|
- out.template ref<scale - 1, 3>() = col;
|
|
|
- }
|
|
|
-
|
|
|
- template <class OutputMatrix>
|
|
|
- static void blendLineDiagonal(uint32_t col, OutputMatrix& out)
|
|
|
- {
|
|
|
- alphaGrad<1, 2>(out.template ref<scale - 1, scale / 2 >(), col);
|
|
|
- alphaGrad<1, 2>(out.template ref<scale - 2, scale / 2 + 1>(), col);
|
|
|
- alphaGrad<1, 2>(out.template ref<scale - 3, scale / 2 + 2>(), col);
|
|
|
-
|
|
|
- out.template ref<scale - 2, scale - 1>() = col;
|
|
|
- out.template ref<scale - 1, scale - 1>() = col;
|
|
|
- out.template ref<scale - 1, scale - 2>() = col;
|
|
|
- }
|
|
|
-
|
|
|
- template <class OutputMatrix>
|
|
|
- static void blendCorner(uint32_t col, OutputMatrix& out)
|
|
|
- {
|
|
|
- //model a round corner
|
|
|
- alphaGrad<97, 100>(out.template ref<5, 5>(), col); //exact: 0.9711013910
|
|
|
- alphaGrad<42, 100>(out.template ref<4, 5>(), col); //0.4236372243
|
|
|
- alphaGrad<42, 100>(out.template ref<5, 4>(), col); //0.4236372243
|
|
|
- alphaGrad< 6, 100>(out.template ref<5, 3>(), col); //0.05652034508
|
|
|
- alphaGrad< 6, 100>(out.template ref<3, 5>(), col); //0.05652034508
|
|
|
- }
|
|
|
-};
|
|
|
-
|
|
|
-//------------------------------------------------------------------------------------
|
|
|
-
|
|
|
-struct ColorDistanceRGB
|
|
|
-{
|
|
|
- static double dist(uint32_t pix1, uint32_t pix2, double luminanceWeight)
|
|
|
- {
|
|
|
- return distYCbCrBuffered(pix1, pix2);
|
|
|
-
|
|
|
- //if (pix1 == pix2) //about 4% perf boost
|
|
|
- // return 0;
|
|
|
- //return distYCbCr(pix1, pix2, luminanceWeight);
|
|
|
- }
|
|
|
-};
|
|
|
-
|
|
|
-struct ColorDistanceARGB
|
|
|
-{
|
|
|
- static double dist(uint32_t pix1, uint32_t pix2, double luminanceWeight)
|
|
|
- {
|
|
|
- const double a1 = getAlpha(pix1) / 255.0 ;
|
|
|
- const double a2 = getAlpha(pix2) / 255.0 ;
|
|
|
- /*
|
|
|
- Requirements for a color distance handling alpha channel: with a1, a2 in [0, 1]
|
|
|
-
|
|
|
- 1. if a1 = a2, distance should be: a1 * distYCbCr()
|
|
|
- 2. if a1 = 0, distance should be: a2 * distYCbCr(black, white) = a2 * 255
|
|
|
- 3. if a1 = 1, ??? maybe: 255 * (1 - a2) + a2 * distYCbCr()
|
|
|
- */
|
|
|
-
|
|
|
- //return std::min(a1, a2) * distYCbCrBuffered(pix1, pix2) + 255 * abs(a1 - a2);
|
|
|
- //=> following code is 15% faster:
|
|
|
- const double d = distYCbCrBuffered(pix1, pix2);
|
|
|
- if (a1 < a2)
|
|
|
- return a1 * d + 255 * (a2 - a1);
|
|
|
- else
|
|
|
- return a2 * d + 255 * (a1 - a2);
|
|
|
-
|
|
|
- //alternative? return std::sqrt(a1 * a2 * square(distYCbCrBuffered(pix1, pix2)) + square(255 * (a1 - a2)));
|
|
|
- }
|
|
|
-};
|
|
|
-
|
|
|
-
|
|
|
-struct ColorDistanceUnbufferedARGB
|
|
|
-{
|
|
|
- static double dist(uint32_t pix1, uint32_t pix2, double luminanceWeight)
|
|
|
- {
|
|
|
- const double a1 = getAlpha(pix1) / 255.0 ;
|
|
|
- const double a2 = getAlpha(pix2) / 255.0 ;
|
|
|
-
|
|
|
- const double d = distYCbCr(pix1, pix2, luminanceWeight);
|
|
|
- if (a1 < a2)
|
|
|
- return a1 * d + 255 * (a2 - a1);
|
|
|
- else
|
|
|
- return a2 * d + 255 * (a1 - a2);
|
|
|
- }
|
|
|
-};
|
|
|
-
|
|
|
-
|
|
|
-struct ColorGradientRGB
|
|
|
-{
|
|
|
- template <unsigned int M, unsigned int N>
|
|
|
- static void alphaGrad(uint32_t& pixBack, uint32_t pixFront)
|
|
|
- {
|
|
|
- pixBack = gradientRGB<M, N>(pixFront, pixBack);
|
|
|
- }
|
|
|
-};
|
|
|
-
|
|
|
-struct ColorGradientARGB
|
|
|
-{
|
|
|
- template <unsigned int M, unsigned int N>
|
|
|
- static void alphaGrad(uint32_t& pixBack, uint32_t pixFront)
|
|
|
- {
|
|
|
- pixBack = gradientARGB<M, N>(pixFront, pixBack);
|
|
|
- }
|
|
|
-};
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-void xbrz::scale(size_t factor, const uint32_t* src, uint32_t* trg, int srcWidth, int srcHeight, ColorFormat colFmt, const xbrz::ScalerCfg& cfg, int yFirst, int yLast)
|
|
|
-{
|
|
|
- if (factor == 1)
|
|
|
- {
|
|
|
- std::copy(src + yFirst * srcWidth, src + yLast * srcWidth, trg);
|
|
|
- return;
|
|
|
- }
|
|
|
-
|
|
|
- static_assert(SCALE_FACTOR_MAX == 6);
|
|
|
- switch (colFmt)
|
|
|
- {
|
|
|
- case ColorFormat::RGB:
|
|
|
- switch (factor)
|
|
|
- {
|
|
|
- case 2:
|
|
|
- return scaleImage<Scaler2x<ColorGradientRGB>, ColorDistanceRGB, OobReaderDuplicate>(src, trg, srcWidth, srcHeight, cfg, yFirst, yLast);
|
|
|
- case 3:
|
|
|
- return scaleImage<Scaler3x<ColorGradientRGB>, ColorDistanceRGB, OobReaderDuplicate>(src, trg, srcWidth, srcHeight, cfg, yFirst, yLast);
|
|
|
- case 4:
|
|
|
- return scaleImage<Scaler4x<ColorGradientRGB>, ColorDistanceRGB, OobReaderDuplicate>(src, trg, srcWidth, srcHeight, cfg, yFirst, yLast);
|
|
|
- case 5:
|
|
|
- return scaleImage<Scaler5x<ColorGradientRGB>, ColorDistanceRGB, OobReaderDuplicate>(src, trg, srcWidth, srcHeight, cfg, yFirst, yLast);
|
|
|
- case 6:
|
|
|
- return scaleImage<Scaler6x<ColorGradientRGB>, ColorDistanceRGB, OobReaderDuplicate>(src, trg, srcWidth, srcHeight, cfg, yFirst, yLast);
|
|
|
- }
|
|
|
- break;
|
|
|
-
|
|
|
- case ColorFormat::ARGB:
|
|
|
- switch (factor)
|
|
|
- {
|
|
|
- case 2:
|
|
|
- return scaleImage<Scaler2x<ColorGradientARGB>, ColorDistanceARGB, OobReaderTransparent>(src, trg, srcWidth, srcHeight, cfg, yFirst, yLast);
|
|
|
- case 3:
|
|
|
- return scaleImage<Scaler3x<ColorGradientARGB>, ColorDistanceARGB, OobReaderTransparent>(src, trg, srcWidth, srcHeight, cfg, yFirst, yLast);
|
|
|
- case 4:
|
|
|
- return scaleImage<Scaler4x<ColorGradientARGB>, ColorDistanceARGB, OobReaderTransparent>(src, trg, srcWidth, srcHeight, cfg, yFirst, yLast);
|
|
|
- case 5:
|
|
|
- return scaleImage<Scaler5x<ColorGradientARGB>, ColorDistanceARGB, OobReaderTransparent>(src, trg, srcWidth, srcHeight, cfg, yFirst, yLast);
|
|
|
- case 6:
|
|
|
- return scaleImage<Scaler6x<ColorGradientARGB>, ColorDistanceARGB, OobReaderTransparent>(src, trg, srcWidth, srcHeight, cfg, yFirst, yLast);
|
|
|
- }
|
|
|
- break;
|
|
|
-
|
|
|
- case ColorFormat::ARGB_UNBUFFERED:
|
|
|
- switch (factor)
|
|
|
- {
|
|
|
- case 2:
|
|
|
- return scaleImage<Scaler2x<ColorGradientARGB>, ColorDistanceUnbufferedARGB, OobReaderTransparent>(src, trg, srcWidth, srcHeight, cfg, yFirst, yLast);
|
|
|
- case 3:
|
|
|
- return scaleImage<Scaler3x<ColorGradientARGB>, ColorDistanceUnbufferedARGB, OobReaderTransparent>(src, trg, srcWidth, srcHeight, cfg, yFirst, yLast);
|
|
|
- case 4:
|
|
|
- return scaleImage<Scaler4x<ColorGradientARGB>, ColorDistanceUnbufferedARGB, OobReaderTransparent>(src, trg, srcWidth, srcHeight, cfg, yFirst, yLast);
|
|
|
- case 5:
|
|
|
- return scaleImage<Scaler5x<ColorGradientARGB>, ColorDistanceUnbufferedARGB, OobReaderTransparent>(src, trg, srcWidth, srcHeight, cfg, yFirst, yLast);
|
|
|
- case 6:
|
|
|
- return scaleImage<Scaler6x<ColorGradientARGB>, ColorDistanceUnbufferedARGB, OobReaderTransparent>(src, trg, srcWidth, srcHeight, cfg, yFirst, yLast);
|
|
|
- }
|
|
|
- break;
|
|
|
- }
|
|
|
- assert(false);
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-bool xbrz::equalColorTest(uint32_t col1, uint32_t col2, ColorFormat colFmt, double luminanceWeight, double equalColorTolerance)
|
|
|
-{
|
|
|
- switch (colFmt)
|
|
|
- {
|
|
|
- case ColorFormat::RGB:
|
|
|
- return ColorDistanceRGB::dist(col1, col2, luminanceWeight) < equalColorTolerance;
|
|
|
- case ColorFormat::ARGB:
|
|
|
- return ColorDistanceARGB::dist(col1, col2, luminanceWeight) < equalColorTolerance;
|
|
|
- case ColorFormat::ARGB_UNBUFFERED:
|
|
|
- return ColorDistanceUnbufferedARGB::dist(col1, col2, luminanceWeight) < equalColorTolerance;
|
|
|
- }
|
|
|
- assert(false);
|
|
|
- return false;
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-void xbrz::bilinearScale(const uint32_t* src, int srcWidth, int srcHeight,
|
|
|
- /**/ uint32_t* trg, int trgWidth, int trgHeight)
|
|
|
-{
|
|
|
- bilinearScale(src, srcWidth, srcHeight, srcWidth * sizeof(uint32_t),
|
|
|
- trg, trgWidth, trgHeight, trgWidth * sizeof(uint32_t),
|
|
|
- 0, trgHeight, [](uint32_t pix) { return pix; });
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-void xbrz::nearestNeighborScale(const uint32_t* src, int srcWidth, int srcHeight,
|
|
|
- /**/ uint32_t* trg, int trgWidth, int trgHeight)
|
|
|
-{
|
|
|
- nearestNeighborScale(src, srcWidth, srcHeight, srcWidth * sizeof(uint32_t),
|
|
|
- trg, trgWidth, trgHeight, trgWidth * sizeof(uint32_t),
|
|
|
- 0, trgHeight, [](uint32_t pix) { return pix; });
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-#if 0
|
|
|
-//#include <ppl.h>
|
|
|
-void bilinearScaleCpu(const uint32_t* src, int srcWidth, int srcHeight,
|
|
|
- /**/ uint32_t* trg, int trgWidth, int trgHeight)
|
|
|
-{
|
|
|
- const int TASK_GRANULARITY = 16;
|
|
|
-
|
|
|
- concurrency::task_group tg;
|
|
|
-
|
|
|
- for (int i = 0; i < trgHeight; i += TASK_GRANULARITY)
|
|
|
- tg.run([=]
|
|
|
- {
|
|
|
- const int iLast = std::min(i + TASK_GRANULARITY, trgHeight);
|
|
|
- xbrz::bilinearScale(src, srcWidth, srcHeight, srcWidth * sizeof(uint32_t),
|
|
|
- trg, trgWidth, trgHeight, trgWidth * sizeof(uint32_t),
|
|
|
- i, iLast, [](uint32_t pix) { return pix; });
|
|
|
- });
|
|
|
- tg.wait();
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-//Perf: AMP vs CPU: merely ~10% shorter runtime (scaling 1280x800 -> 1920x1080)
|
|
|
-//#include <amp.h>
|
|
|
-void bilinearScaleAmp(const uint32_t* src, int srcWidth, int srcHeight, //throw concurrency::runtime_exception
|
|
|
- /**/ uint32_t* trg, int trgWidth, int trgHeight)
|
|
|
-{
|
|
|
- //C++ AMP reference: https://msdn.microsoft.com/en-us/library/hh289390.aspx
|
|
|
- //introduction to C++ AMP: https://msdn.microsoft.com/en-us/magazine/hh882446.aspx
|
|
|
- using namespace concurrency;
|
|
|
- //TODO: pitch
|
|
|
-
|
|
|
- if (srcHeight <= 0 || srcWidth <= 0) return;
|
|
|
-
|
|
|
- const float scaleX = static_cast<float>(trgWidth ) / srcWidth;
|
|
|
- const float scaleY = static_cast<float>(trgHeight) / srcHeight;
|
|
|
-
|
|
|
- array_view<const uint32_t, 2> srcView(srcHeight, srcWidth, src);
|
|
|
- array_view< uint32_t, 2> trgView(trgHeight, trgWidth, trg);
|
|
|
- trgView.discard_data();
|
|
|
-
|
|
|
- parallel_for_each(trgView.extent, [=](index<2> idx) restrict(amp) //throw ?
|
|
|
- {
|
|
|
- const int y = idx[0];
|
|
|
- const int x = idx[1];
|
|
|
- //Perf notes:
|
|
|
- // -> float-based calculation is (almost) 2x as fas as double!
|
|
|
- // -> no noticeable improvement via tiling: https://msdn.microsoft.com/en-us/magazine/hh882447.aspx
|
|
|
- // -> no noticeable improvement with restrict(amp,cpu)
|
|
|
- // -> iterating over y-axis only is significantly slower!
|
|
|
- // -> pre-calculating x,y-dependent variables in a buffer + array_view<> is ~ 20 % slower!
|
|
|
- const int y1 = srcHeight * y / trgHeight;
|
|
|
- int y2 = y1 + 1;
|
|
|
- if (y2 == srcHeight) --y2;
|
|
|
-
|
|
|
- const float yy1 = y / scaleY - y1;
|
|
|
- const float y2y = 1 - yy1;
|
|
|
- //-------------------------------------
|
|
|
- const int x1 = srcWidth * x / trgWidth;
|
|
|
- int x2 = x1 + 1;
|
|
|
- if (x2 == srcWidth) --x2;
|
|
|
-
|
|
|
- const float xx1 = x / scaleX - x1;
|
|
|
- const float x2x = 1 - xx1;
|
|
|
- //-------------------------------------
|
|
|
- const float x2xy2y = x2x * y2y;
|
|
|
- const float xx1y2y = xx1 * y2y;
|
|
|
- const float x2xyy1 = x2x * yy1;
|
|
|
- const float xx1yy1 = xx1 * yy1;
|
|
|
-
|
|
|
- auto interpolate = [=](int offset)
|
|
|
- {
|
|
|
- /*
|
|
|
- https://en.wikipedia.org/wiki/Bilinear_interpolation
|
|
|
- (c11(x2 - x) + c21(x - x1)) * (y2 - y ) +
|
|
|
- (c12(x2 - x) + c22(x - x1)) * (y - y1)
|
|
|
- */
|
|
|
- const auto c11 = (srcView(y1, x1) >> (8 * offset)) & 0xff;
|
|
|
- const auto c21 = (srcView(y1, x2) >> (8 * offset)) & 0xff;
|
|
|
- const auto c12 = (srcView(y2, x1) >> (8 * offset)) & 0xff;
|
|
|
- const auto c22 = (srcView(y2, x2) >> (8 * offset)) & 0xff;
|
|
|
-
|
|
|
- return c11 * x2xy2y + c21 * xx1y2y +
|
|
|
- c12 * x2xyy1 + c22 * xx1yy1;
|
|
|
- };
|
|
|
-
|
|
|
- const float bi = interpolate(0);
|
|
|
- const float gi = interpolate(1);
|
|
|
- const float ri = interpolate(2);
|
|
|
- const float ai = interpolate(3);
|
|
|
-
|
|
|
- const auto b = static_cast<uint32_t>(bi + 0.5f);
|
|
|
- const auto g = static_cast<uint32_t>(gi + 0.5f);
|
|
|
- const auto r = static_cast<uint32_t>(ri + 0.5f);
|
|
|
- const auto a = static_cast<uint32_t>(ai + 0.5f);
|
|
|
-
|
|
|
- trgView(y, x) = (a << 24) | (r << 16) | (g << 8) | b;
|
|
|
- });
|
|
|
- trgView.synchronize(); //throw ?
|
|
|
-}
|
|
|
+// ****************************************************************************
|
|
|
+// * This file is part of the xBRZ project. It is distributed under *
|
|
|
+// * GNU General Public License: https://www.gnu.org/licenses/gpl-3.0 *
|
|
|
+// * Copyright (C) Zenju (zenju AT gmx DOT de) - All Rights Reserved *
|
|
|
+// * *
|
|
|
+// * Additionally and as a special exception, the author gives permission *
|
|
|
+// * to link the code of this program with the following libraries *
|
|
|
+// * (or with modified versions that use the same licenses), and distribute *
|
|
|
+// * linked combinations including the two: MAME, FreeFileSync, Snes9x, ePSXe *
|
|
|
+// * You must obey the GNU General Public License in all respects for all of *
|
|
|
+// * the code used other than MAME, FreeFileSync, Snes9x, ePSXe. *
|
|
|
+// * If you modify this file, you may extend this exception to your version *
|
|
|
+// * of the file, but you are not obligated to do so. If you do not wish to *
|
|
|
+// * do so, delete this exception statement from your version. *
|
|
|
+// ****************************************************************************
|
|
|
+
|
|
|
+#include "xbrz.h"
|
|
|
+#include <cassert>
|
|
|
+#include <vector>
|
|
|
+#include <algorithm>
|
|
|
+#include <cmath> //std::sqrt
|
|
|
+#include "xbrz_tools.h"
|
|
|
+
|
|
|
+using namespace xbrz;
|
|
|
+
|
|
|
+
|
|
|
+namespace
|
|
|
+{
|
|
|
+template <unsigned int M, unsigned int N> inline
|
|
|
+uint32_t gradientRGB(uint32_t pixFront, uint32_t pixBack) //blend front color with opacity M / N over opaque background: https://en.wikipedia.org/wiki/Alpha_compositing#Alpha_blending
|
|
|
+{
|
|
|
+ static_assert(0 < M && M < N && N <= 1000);
|
|
|
+
|
|
|
+ auto calcColor = [](unsigned char colFront, unsigned char colBack) -> unsigned char { return (colFront * M + colBack * (N - M)) / N; };
|
|
|
+
|
|
|
+ return makePixel(calcColor(getRed (pixFront), getRed (pixBack)),
|
|
|
+ calcColor(getGreen(pixFront), getGreen(pixBack)),
|
|
|
+ calcColor(getBlue (pixFront), getBlue (pixBack)));
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+template <unsigned int M, unsigned int N> inline
|
|
|
+uint32_t gradientARGB(uint32_t pixFront, uint32_t pixBack) //find intermediate color between two colors with alpha channels (=> NO alpha blending!!!)
|
|
|
+{
|
|
|
+ static_assert(0 < M && M < N && N <= 1000);
|
|
|
+
|
|
|
+ const unsigned int weightFront = getAlpha(pixFront) * M;
|
|
|
+ const unsigned int weightBack = getAlpha(pixBack) * (N - M);
|
|
|
+ const unsigned int weightSum = weightFront + weightBack;
|
|
|
+ if (weightSum == 0)
|
|
|
+ return 0;
|
|
|
+
|
|
|
+ auto calcColor = [=](unsigned char colFront, unsigned char colBack)
|
|
|
+ {
|
|
|
+ return static_cast<unsigned char>((colFront * weightFront + colBack * weightBack) / weightSum);
|
|
|
+ };
|
|
|
+
|
|
|
+ return makePixel(static_cast<unsigned char>(weightSum / N),
|
|
|
+ calcColor(getRed (pixFront), getRed (pixBack)),
|
|
|
+ calcColor(getGreen(pixFront), getGreen(pixBack)),
|
|
|
+ calcColor(getBlue (pixFront), getBlue (pixBack)));
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+//inline
|
|
|
+//double fastSqrt(double n)
|
|
|
+//{
|
|
|
+// __asm //speeds up xBRZ by about 9% compared to std::sqrt which internally uses the same assembler instructions but adds some "fluff"
|
|
|
+// {
|
|
|
+// fld n
|
|
|
+// fsqrt
|
|
|
+// }
|
|
|
+//}
|
|
|
+//
|
|
|
+
|
|
|
+
|
|
|
+#ifdef _MSC_VER
|
|
|
+ #define FORCE_INLINE __forceinline
|
|
|
+#elif defined __GNUC__
|
|
|
+ #define FORCE_INLINE __attribute__((always_inline)) inline
|
|
|
+#else
|
|
|
+ #define FORCE_INLINE inline
|
|
|
+#endif
|
|
|
+
|
|
|
+
|
|
|
+enum RotationDegree //clock-wise
|
|
|
+{
|
|
|
+ ROT_0,
|
|
|
+ ROT_90,
|
|
|
+ ROT_180,
|
|
|
+ ROT_270
|
|
|
+};
|
|
|
+
|
|
|
+//calculate input matrix coordinates after rotation at compile time
|
|
|
+template <RotationDegree rotDeg, size_t I, size_t J, size_t N>
|
|
|
+struct MatrixRotation;
|
|
|
+
|
|
|
+template <size_t I, size_t J, size_t N>
|
|
|
+struct MatrixRotation<ROT_0, I, J, N>
|
|
|
+{
|
|
|
+ static const size_t I_old = I;
|
|
|
+ static const size_t J_old = J;
|
|
|
+};
|
|
|
+
|
|
|
+template <RotationDegree rotDeg, size_t I, size_t J, size_t N> //(i, j) = (row, col) indices, N = size of (square) matrix
|
|
|
+struct MatrixRotation
|
|
|
+{
|
|
|
+ static const size_t I_old = N - 1 - MatrixRotation<static_cast<RotationDegree>(rotDeg - 1), I, J, N>::J_old; //old coordinates before rotation!
|
|
|
+ static const size_t J_old = MatrixRotation<static_cast<RotationDegree>(rotDeg - 1), I, J, N>::I_old; //
|
|
|
+};
|
|
|
+
|
|
|
+
|
|
|
+template <size_t N, RotationDegree rotDeg>
|
|
|
+class OutputMatrix
|
|
|
+{
|
|
|
+public:
|
|
|
+ OutputMatrix(uint32_t* out, int outWidth) : //access matrix area, top-left at position "out" for image with given width
|
|
|
+ out_(out),
|
|
|
+ outWidth_(outWidth) {}
|
|
|
+
|
|
|
+ template <size_t I, size_t J>
|
|
|
+ uint32_t& ref() const
|
|
|
+ {
|
|
|
+ static const size_t I_old = MatrixRotation<rotDeg, I, J, N>::I_old;
|
|
|
+ static const size_t J_old = MatrixRotation<rotDeg, I, J, N>::J_old;
|
|
|
+ return *(out_ + J_old + I_old * outWidth_);
|
|
|
+ }
|
|
|
+
|
|
|
+private:
|
|
|
+ uint32_t* out_;
|
|
|
+ const int outWidth_;
|
|
|
+};
|
|
|
+
|
|
|
+
|
|
|
+template <class T> inline
|
|
|
+T square(T value) { return value * value; }
|
|
|
+
|
|
|
+
|
|
|
+#if 0
|
|
|
+inline
|
|
|
+double distRGB(uint32_t pix1, uint32_t pix2)
|
|
|
+{
|
|
|
+ const double r_diff = static_cast<int>(getRed (pix1)) - getRed (pix2);
|
|
|
+ const double g_diff = static_cast<int>(getGreen(pix1)) - getGreen(pix2);
|
|
|
+ const double b_diff = static_cast<int>(getBlue (pix1)) - getBlue (pix2);
|
|
|
+
|
|
|
+ //euklidean RGB distance
|
|
|
+ return std::sqrt(square(r_diff) + square(g_diff) + square(b_diff));
|
|
|
+}
|
|
|
+#endif
|
|
|
+
|
|
|
+
|
|
|
+inline
|
|
|
+double distYCbCr(uint32_t pix1, uint32_t pix2, double lumaWeight)
|
|
|
+{
|
|
|
+ //https://en.wikipedia.org/wiki/YCbCr#ITU-R_BT.601_conversion
|
|
|
+ //YCbCr conversion is a matrix multiplication => take advantage of linearity by subtracting first!
|
|
|
+ const int r_diff = static_cast<int>(getRed (pix1)) - getRed (pix2); //we may delay division by 255 to after matrix multiplication
|
|
|
+ const int g_diff = static_cast<int>(getGreen(pix1)) - getGreen(pix2); //
|
|
|
+ const int b_diff = static_cast<int>(getBlue (pix1)) - getBlue (pix2); //substraction for int is noticeable faster than for double!
|
|
|
+
|
|
|
+ //const double k_b = 0.0722; //ITU-R BT.709 conversion
|
|
|
+ //const double k_r = 0.2126; //
|
|
|
+ const double k_b = 0.0593; //ITU-R BT.2020 conversion
|
|
|
+ const double k_r = 0.2627; //
|
|
|
+ const double k_g = 1 - k_b - k_r;
|
|
|
+
|
|
|
+ const double scale_b = 0.5 / (1 - k_b);
|
|
|
+ const double scale_r = 0.5 / (1 - k_r);
|
|
|
+
|
|
|
+ const double y = k_r * r_diff + k_g * g_diff + k_b * b_diff; //[!], analog YCbCr!
|
|
|
+ const double c_b = scale_b * (b_diff - y);
|
|
|
+ const double c_r = scale_r * (r_diff - y);
|
|
|
+
|
|
|
+ //we skip division by 255 to have similar range like other distance functions
|
|
|
+ return std::sqrt(square(lumaWeight * y) + square(c_b) + square(c_r));
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+inline
|
|
|
+double distYCbCrBuffered(uint32_t pix1, uint32_t pix2)
|
|
|
+{
|
|
|
+ //30% perf boost compared to plain distYCbCr()!
|
|
|
+ //consumes 64 MB memory; using double is only 2% faster, but takes 128 MB
|
|
|
+ static const std::vector<float> diffToDist = []
|
|
|
+ {
|
|
|
+ std::vector<float> tmp;
|
|
|
+
|
|
|
+ for (uint32_t i = 0; i < 256 * 256 * 256; ++i) //startup time: 114 ms on Intel Core i5 (four cores)
|
|
|
+ {
|
|
|
+ const int r_diff = static_cast<signed char>(getByte<2>(i)) * 2;
|
|
|
+ const int g_diff = static_cast<signed char>(getByte<1>(i)) * 2;
|
|
|
+ const int b_diff = static_cast<signed char>(getByte<0>(i)) * 2;
|
|
|
+
|
|
|
+ const double k_b = 0.0593; //ITU-R BT.2020 conversion
|
|
|
+ const double k_r = 0.2627; //
|
|
|
+ const double k_g = 1 - k_b - k_r;
|
|
|
+
|
|
|
+ const double scale_b = 0.5 / (1 - k_b);
|
|
|
+ const double scale_r = 0.5 / (1 - k_r);
|
|
|
+
|
|
|
+ const double y = k_r * r_diff + k_g * g_diff + k_b * b_diff; //[!], analog YCbCr!
|
|
|
+ const double c_b = scale_b * (b_diff - y);
|
|
|
+ const double c_r = scale_r * (r_diff - y);
|
|
|
+
|
|
|
+ tmp.push_back(static_cast<float>(std::sqrt(square(y) + square(c_b) + square(c_r))));
|
|
|
+ }
|
|
|
+ return tmp;
|
|
|
+ }();
|
|
|
+
|
|
|
+ //if (pix1 == pix2) -> 8% perf degradation!
|
|
|
+ // return 0;
|
|
|
+ //if (pix1 < pix2)
|
|
|
+ // std::swap(pix1, pix2); -> 30% perf degradation!!!
|
|
|
+
|
|
|
+ const int r_diff = static_cast<int>(getRed (pix1)) - getRed (pix2);
|
|
|
+ const int g_diff = static_cast<int>(getGreen(pix1)) - getGreen(pix2);
|
|
|
+ const int b_diff = static_cast<int>(getBlue (pix1)) - getBlue (pix2);
|
|
|
+
|
|
|
+ const size_t index = (static_cast<unsigned char>(r_diff / 2) << 16) | //slightly reduce precision (division by 2) to squeeze value into single byte
|
|
|
+ (static_cast<unsigned char>(g_diff / 2) << 8) |
|
|
|
+ (static_cast<unsigned char>(b_diff / 2));
|
|
|
+
|
|
|
+#if 0 //attention: the following calculation creates an asymmetric color distance!!! (e.g. r_diff=46 will be unpacked as 45, but r_diff=-46 unpacks to -47
|
|
|
+ const size_t index = (((r_diff + 0xFF) / 2) << 16) | //slightly reduce precision (division by 2) to squeeze value into single byte
|
|
|
+ (((g_diff + 0xFF) / 2) << 8) |
|
|
|
+ (( b_diff + 0xFF) / 2);
|
|
|
+#endif
|
|
|
+ return diffToDist[index];
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+#if defined _MSC_VER && !defined NDEBUG
|
|
|
+ const int debugPixelX = -1;
|
|
|
+ const int debugPixelY = 58;
|
|
|
+
|
|
|
+ thread_local bool breakIntoDebugger = false;
|
|
|
+#endif
|
|
|
+
|
|
|
+
|
|
|
+enum BlendType
|
|
|
+{
|
|
|
+ BLEND_NONE = 0,
|
|
|
+ BLEND_NORMAL, //a normal indication to blend
|
|
|
+ BLEND_DOMINANT, //a strong indication to blend
|
|
|
+ //attention: BlendType must fit into the value range of 2 bit!!!
|
|
|
+};
|
|
|
+
|
|
|
+struct BlendResult
|
|
|
+{
|
|
|
+ BlendType
|
|
|
+ /**/blend_f, blend_g,
|
|
|
+ /**/blend_j, blend_k;
|
|
|
+};
|
|
|
+
|
|
|
+
|
|
|
+struct Kernel_3x3
|
|
|
+{
|
|
|
+ uint32_t
|
|
|
+ a, b, c,
|
|
|
+ d, e, f,
|
|
|
+ g, h, i;
|
|
|
+};
|
|
|
+
|
|
|
+struct Kernel_4x4 //kernel for preprocessing step
|
|
|
+{
|
|
|
+ uint32_t
|
|
|
+ a, b, c, //
|
|
|
+ e, f, g, // support reinterpret_cast from Kernel_4x4 => Kernel_3x3
|
|
|
+ i, j, k, //
|
|
|
+ m, n, o,
|
|
|
+ d, h, l, p;
|
|
|
+};
|
|
|
+
|
|
|
+/* input kernel area naming convention:
|
|
|
+-----------------
|
|
|
+| A | B | C | D |
|
|
|
+|---|---|---|---|
|
|
|
+| E | F | G | H | evaluate the four corners between F, G, J, K
|
|
|
+|---|---|---|---| input pixel is at position F
|
|
|
+| I | J | K | L |
|
|
|
+|---|---|---|---|
|
|
|
+| M | N | O | P |
|
|
|
+-----------------
|
|
|
+*/
|
|
|
+template <class ColorDistance>
|
|
|
+FORCE_INLINE //detect blend direction
|
|
|
+BlendResult preProcessCorners(const Kernel_4x4& ker, const xbrz::ScalerCfg& cfg) //result: F, G, J, K corners of "GradientType"
|
|
|
+{
|
|
|
+#if defined _MSC_VER && !defined NDEBUG
|
|
|
+ if (breakIntoDebugger)
|
|
|
+ __debugbreak(); //__asm int 3;
|
|
|
+#endif
|
|
|
+
|
|
|
+ BlendResult result = {};
|
|
|
+
|
|
|
+ if ((ker.f == ker.g &&
|
|
|
+ ker.j == ker.k) ||
|
|
|
+ (ker.f == ker.j &&
|
|
|
+ ker.g == ker.k))
|
|
|
+ return result;
|
|
|
+
|
|
|
+ auto dist = [&](uint32_t pix1, uint32_t pix2) { return ColorDistance::dist(pix1, pix2, cfg.luminanceWeight); };
|
|
|
+
|
|
|
+ double jg = dist(ker.i, ker.f) + dist(ker.f, ker.c) + dist(ker.n, ker.k) + dist(ker.k, ker.h) + cfg.centerDirectionBias * dist(ker.j, ker.g);
|
|
|
+ double fk = dist(ker.e, ker.j) + dist(ker.j, ker.o) + dist(ker.b, ker.g) + dist(ker.g, ker.l) + cfg.centerDirectionBias * dist(ker.f, ker.k);
|
|
|
+
|
|
|
+ if (jg < fk) //test sample: 70% of values max(jg, fk) / min(jg, fk) are between 1.1 and 3.7 with median being 1.8
|
|
|
+ {
|
|
|
+ const bool dominantGradient = cfg.dominantDirectionThreshold * jg < fk;
|
|
|
+ if (ker.f != ker.g && ker.f != ker.j)
|
|
|
+ result.blend_f = dominantGradient ? BLEND_DOMINANT : BLEND_NORMAL;
|
|
|
+
|
|
|
+ if (ker.k != ker.j && ker.k != ker.g)
|
|
|
+ result.blend_k = dominantGradient ? BLEND_DOMINANT : BLEND_NORMAL;
|
|
|
+ }
|
|
|
+ else if (fk < jg)
|
|
|
+ {
|
|
|
+ const bool dominantGradient = cfg.dominantDirectionThreshold * fk < jg;
|
|
|
+ if (ker.j != ker.f && ker.j != ker.k)
|
|
|
+ result.blend_j = dominantGradient ? BLEND_DOMINANT : BLEND_NORMAL;
|
|
|
+
|
|
|
+ if (ker.g != ker.f && ker.g != ker.k)
|
|
|
+ result.blend_g = dominantGradient ? BLEND_DOMINANT : BLEND_NORMAL;
|
|
|
+ }
|
|
|
+ return result;
|
|
|
+}
|
|
|
+
|
|
|
+#define DEF_GETTER(x) template <RotationDegree rotDeg> uint32_t inline get_##x(const Kernel_3x3& ker) { return ker.x; }
|
|
|
+//we cannot and NEED NOT write "ker.##x" since ## concatenates preprocessor tokens but "." is not a token
|
|
|
+DEF_GETTER(a) DEF_GETTER(b) DEF_GETTER(c)
|
|
|
+DEF_GETTER(d) DEF_GETTER(e) DEF_GETTER(f)
|
|
|
+DEF_GETTER(g) DEF_GETTER(h) DEF_GETTER(i)
|
|
|
+#undef DEF_GETTER
|
|
|
+
|
|
|
+#define DEF_GETTER(x, y) template <> inline uint32_t get_##x<ROT_90>(const Kernel_3x3& ker) { return ker.y; }
|
|
|
+DEF_GETTER(a, g) DEF_GETTER(b, d) DEF_GETTER(c, a)
|
|
|
+DEF_GETTER(d, h) DEF_GETTER(e, e) DEF_GETTER(f, b)
|
|
|
+DEF_GETTER(g, i) DEF_GETTER(h, f) DEF_GETTER(i, c)
|
|
|
+#undef DEF_GETTER
|
|
|
+
|
|
|
+#define DEF_GETTER(x, y) template <> inline uint32_t get_##x<ROT_180>(const Kernel_3x3& ker) { return ker.y; }
|
|
|
+DEF_GETTER(a, i) DEF_GETTER(b, h) DEF_GETTER(c, g)
|
|
|
+DEF_GETTER(d, f) DEF_GETTER(e, e) DEF_GETTER(f, d)
|
|
|
+DEF_GETTER(g, c) DEF_GETTER(h, b) DEF_GETTER(i, a)
|
|
|
+#undef DEF_GETTER
|
|
|
+
|
|
|
+#define DEF_GETTER(x, y) template <> inline uint32_t get_##x<ROT_270>(const Kernel_3x3& ker) { return ker.y; }
|
|
|
+DEF_GETTER(a, c) DEF_GETTER(b, f) DEF_GETTER(c, i)
|
|
|
+DEF_GETTER(d, b) DEF_GETTER(e, e) DEF_GETTER(f, h)
|
|
|
+DEF_GETTER(g, a) DEF_GETTER(h, d) DEF_GETTER(i, g)
|
|
|
+#undef DEF_GETTER
|
|
|
+
|
|
|
+
|
|
|
+//compress four blend types into a single byte
|
|
|
+//inline BlendType getTopL (unsigned char b) { return static_cast<BlendType>(0x3 & b); }
|
|
|
+inline BlendType getTopR (unsigned char b) { return static_cast<BlendType>(0x3 & (b >> 2)); }
|
|
|
+inline BlendType getBottomR(unsigned char b) { return static_cast<BlendType>(0x3 & (b >> 4)); }
|
|
|
+inline BlendType getBottomL(unsigned char b) { return static_cast<BlendType>(0x3 & (b >> 6)); }
|
|
|
+
|
|
|
+inline void clearAddTopL(unsigned char& b, BlendType bt) { b = static_cast<unsigned char>(bt); }
|
|
|
+inline void addTopR (unsigned char& b, BlendType bt) { b |= (bt << 2); } //buffer is assumed to be initialized before preprocessing!
|
|
|
+inline void addBottomR (unsigned char& b, BlendType bt) { b |= (bt << 4); } //e.g. via clearAddTopL()
|
|
|
+inline void addBottomL (unsigned char& b, BlendType bt) { b |= (bt << 6); } //
|
|
|
+
|
|
|
+inline bool blendingNeeded(unsigned char b)
|
|
|
+{
|
|
|
+ static_assert(BLEND_NONE == 0);
|
|
|
+ return b != 0;
|
|
|
+}
|
|
|
+
|
|
|
+template <RotationDegree rotDeg> inline
|
|
|
+unsigned char rotateBlendInfo(unsigned char b) { return b; }
|
|
|
+template <> inline unsigned char rotateBlendInfo<ROT_90 >(unsigned char b) { return ((b << 2) | (b >> 6)) & 0xff; }
|
|
|
+template <> inline unsigned char rotateBlendInfo<ROT_180>(unsigned char b) { return ((b << 4) | (b >> 4)) & 0xff; }
|
|
|
+template <> inline unsigned char rotateBlendInfo<ROT_270>(unsigned char b) { return ((b << 6) | (b >> 2)) & 0xff; }
|
|
|
+
|
|
|
+
|
|
|
+/* input kernel area naming convention:
|
|
|
+-------------
|
|
|
+| A | B | C |
|
|
|
+|---|---|---|
|
|
|
+| D | E | F | input pixel is at position E
|
|
|
+|---|---|---|
|
|
|
+| G | H | I |
|
|
|
+-------------
|
|
|
+*/
|
|
|
+template <class Scaler, class ColorDistance, RotationDegree rotDeg>
|
|
|
+FORCE_INLINE //perf: quite worth it!
|
|
|
+void blendPixel(const Kernel_3x3& ker,
|
|
|
+ uint32_t* target, int trgWidth,
|
|
|
+ unsigned char blendInfo, //result of preprocessing all four corners of pixel "e"
|
|
|
+ const xbrz::ScalerCfg& cfg)
|
|
|
+{
|
|
|
+ //#define a get_a<rotDeg>(ker)
|
|
|
+#define b get_b<rotDeg>(ker)
|
|
|
+#define c get_c<rotDeg>(ker)
|
|
|
+#define d get_d<rotDeg>(ker)
|
|
|
+#define e get_e<rotDeg>(ker)
|
|
|
+#define f get_f<rotDeg>(ker)
|
|
|
+#define g get_g<rotDeg>(ker)
|
|
|
+#define h get_h<rotDeg>(ker)
|
|
|
+#define i get_i<rotDeg>(ker)
|
|
|
+
|
|
|
+#if defined _MSC_VER && !defined NDEBUG
|
|
|
+ if (breakIntoDebugger)
|
|
|
+ __debugbreak(); //__asm int 3;
|
|
|
+#endif
|
|
|
+
|
|
|
+ const unsigned char blend = rotateBlendInfo<rotDeg>(blendInfo);
|
|
|
+
|
|
|
+ if (getBottomR(blend) >= BLEND_NORMAL)
|
|
|
+ {
|
|
|
+ auto eq = [&](uint32_t pix1, uint32_t pix2) { return ColorDistance::dist(pix1, pix2, cfg.luminanceWeight) < cfg.equalColorTolerance; };
|
|
|
+ auto dist = [&](uint32_t pix1, uint32_t pix2) { return ColorDistance::dist(pix1, pix2, cfg.luminanceWeight); };
|
|
|
+
|
|
|
+ const bool doLineBlend = [&]() -> bool
|
|
|
+ {
|
|
|
+ if (getBottomR(blend) >= BLEND_DOMINANT)
|
|
|
+ return true;
|
|
|
+
|
|
|
+ //make sure there is no second blending in an adjacent rotation for this pixel: handles insular pixels, mario eyes
|
|
|
+ if (getTopR(blend) != BLEND_NONE && !eq(e, g)) //but support double-blending for 90° corners
|
|
|
+ return false;
|
|
|
+ if (getBottomL(blend) != BLEND_NONE && !eq(e, c))
|
|
|
+ return false;
|
|
|
+
|
|
|
+ //no full blending for L-shapes; blend corner only (handles "mario mushroom eyes")
|
|
|
+ if (!eq(e, i) && eq(g, h) && eq(h, i) && eq(i, f) && eq(f, c))
|
|
|
+ return false;
|
|
|
+
|
|
|
+ return true;
|
|
|
+ }();
|
|
|
+
|
|
|
+ const uint32_t px = dist(e, f) <= dist(e, h) ? f : h; //choose most similar color
|
|
|
+
|
|
|
+ OutputMatrix<Scaler::scale, rotDeg> out(target, trgWidth);
|
|
|
+
|
|
|
+ if (doLineBlend)
|
|
|
+ {
|
|
|
+ const double fg = dist(f, g); //test sample: 70% of values max(fg, hc) / min(fg, hc) are between 1.1 and 3.7 with median being 1.9
|
|
|
+ const double hc = dist(h, c); //
|
|
|
+
|
|
|
+ const bool haveShallowLine = cfg.steepDirectionThreshold * fg <= hc && e != g && d != g;
|
|
|
+ const bool haveSteepLine = cfg.steepDirectionThreshold * hc <= fg && e != c && b != c;
|
|
|
+
|
|
|
+ if (haveShallowLine)
|
|
|
+ {
|
|
|
+ if (haveSteepLine)
|
|
|
+ Scaler::blendLineSteepAndShallow(px, out);
|
|
|
+ else
|
|
|
+ Scaler::blendLineShallow(px, out);
|
|
|
+ }
|
|
|
+ else
|
|
|
+ {
|
|
|
+ if (haveSteepLine)
|
|
|
+ Scaler::blendLineSteep(px, out);
|
|
|
+ else
|
|
|
+ Scaler::blendLineDiagonal(px, out);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ else
|
|
|
+ Scaler::blendCorner(px, out);
|
|
|
+ }
|
|
|
+
|
|
|
+ //#undef a
|
|
|
+#undef b
|
|
|
+#undef c
|
|
|
+#undef d
|
|
|
+#undef e
|
|
|
+#undef f
|
|
|
+#undef g
|
|
|
+#undef h
|
|
|
+#undef i
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+class OobReaderTransparent
|
|
|
+{
|
|
|
+public:
|
|
|
+ OobReaderTransparent(const uint32_t* src, int srcWidth, int srcHeight, int y) :
|
|
|
+ s_m1(0 <= y - 1 && y - 1 < srcHeight ? src + srcWidth * (y - 1) : nullptr),
|
|
|
+ s_0 (0 <= y && y < srcHeight ? src + srcWidth * y : nullptr),
|
|
|
+ s_p1(0 <= y + 1 && y + 1 < srcHeight ? src + srcWidth * (y + 1) : nullptr),
|
|
|
+ s_p2(0 <= y + 2 && y + 2 < srcHeight ? src + srcWidth * (y + 2) : nullptr),
|
|
|
+ srcWidth_(srcWidth) {}
|
|
|
+
|
|
|
+ void readDhlp(Kernel_4x4& ker, int x) const //(x, y) is at kernel position F
|
|
|
+ {
|
|
|
+ [[likely]] if (const int x_p2 = x + 2; 0 <= x_p2 && x_p2 < srcWidth_)
|
|
|
+ {
|
|
|
+ ker.d = s_m1 ? s_m1[x_p2] : 0;
|
|
|
+ ker.h = s_0 ? s_0 [x_p2] : 0;
|
|
|
+ ker.l = s_p1 ? s_p1[x_p2] : 0;
|
|
|
+ ker.p = s_p2 ? s_p2[x_p2] : 0;
|
|
|
+ }
|
|
|
+ else
|
|
|
+ {
|
|
|
+ ker.d = 0;
|
|
|
+ ker.h = 0;
|
|
|
+ ker.l = 0;
|
|
|
+ ker.p = 0;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+private:
|
|
|
+ const uint32_t* const s_m1;
|
|
|
+ const uint32_t* const s_0;
|
|
|
+ const uint32_t* const s_p1;
|
|
|
+ const uint32_t* const s_p2;
|
|
|
+ const int srcWidth_;
|
|
|
+};
|
|
|
+
|
|
|
+
|
|
|
+class OobReaderDuplicate
|
|
|
+{
|
|
|
+public:
|
|
|
+ OobReaderDuplicate(const uint32_t* src, int srcWidth, int srcHeight, int y) :
|
|
|
+ s_m1(src + srcWidth * std::clamp(y - 1, 0, srcHeight - 1)),
|
|
|
+ s_0 (src + srcWidth * std::clamp(y, 0, srcHeight - 1)),
|
|
|
+ s_p1(src + srcWidth * std::clamp(y + 1, 0, srcHeight - 1)),
|
|
|
+ s_p2(src + srcWidth * std::clamp(y + 2, 0, srcHeight - 1)),
|
|
|
+ srcWidth_(srcWidth) {}
|
|
|
+
|
|
|
+ void readDhlp(Kernel_4x4& ker, int x) const //(x, y) is at kernel position F
|
|
|
+ {
|
|
|
+ const int x_p2 = std::clamp(x + 2, 0, srcWidth_ - 1);
|
|
|
+ ker.d = s_m1[x_p2];
|
|
|
+ ker.h = s_0 [x_p2];
|
|
|
+ ker.l = s_p1[x_p2];
|
|
|
+ ker.p = s_p2[x_p2];
|
|
|
+ }
|
|
|
+
|
|
|
+private:
|
|
|
+ const uint32_t* const s_m1;
|
|
|
+ const uint32_t* const s_0;
|
|
|
+ const uint32_t* const s_p1;
|
|
|
+ const uint32_t* const s_p2;
|
|
|
+ const int srcWidth_;
|
|
|
+};
|
|
|
+
|
|
|
+
|
|
|
+template <class Scaler, class ColorDistance, class OobReader> //scaler policy: see "Scaler2x" reference implementation
|
|
|
+void scaleImage(const uint32_t* src, uint32_t* trg, int srcWidth, int srcHeight, const xbrz::ScalerCfg& cfg, int yFirst, int yLast)
|
|
|
+{
|
|
|
+ yFirst = std::max(yFirst, 0);
|
|
|
+ yLast = std::min(yLast, srcHeight);
|
|
|
+ if (yFirst >= yLast || srcWidth <= 0)
|
|
|
+ return;
|
|
|
+
|
|
|
+ const int trgWidth = srcWidth * Scaler::scale;
|
|
|
+
|
|
|
+ //(ab)use space of "sizeof(uint32_t) * srcWidth * Scaler::scale" at the end of the image as temporary
|
|
|
+ //buffer for "on the fly preprocessing" without risk of accidental overwriting before accessing
|
|
|
+ unsigned char* const preProcBuf = reinterpret_cast<unsigned char*>(trg + yLast * Scaler::scale * trgWidth) - srcWidth;
|
|
|
+
|
|
|
+ //initialize preprocessing buffer for first row of current stripe: detect upper left and right corner blending
|
|
|
+ //this cannot be optimized for adjacent processing stripes; we must not allow for a memory race condition!
|
|
|
+ {
|
|
|
+ const OobReader oobReader(src, srcWidth, srcHeight, yFirst - 1);
|
|
|
+
|
|
|
+ //initialize at position x = -1
|
|
|
+ Kernel_4x4 ker4 = {};
|
|
|
+ oobReader.readDhlp(ker4, -4); //hack: read a, e, i, m at x = -1
|
|
|
+ ker4.a = ker4.d;
|
|
|
+ ker4.e = ker4.h;
|
|
|
+ ker4.i = ker4.l;
|
|
|
+ ker4.m = ker4.p;
|
|
|
+
|
|
|
+ oobReader.readDhlp(ker4, -3);
|
|
|
+ ker4.b = ker4.d;
|
|
|
+ ker4.f = ker4.h;
|
|
|
+ ker4.j = ker4.l;
|
|
|
+ ker4.n = ker4.p;
|
|
|
+
|
|
|
+ oobReader.readDhlp(ker4, -2);
|
|
|
+ ker4.c = ker4.d;
|
|
|
+ ker4.g = ker4.h;
|
|
|
+ ker4.k = ker4.l;
|
|
|
+ ker4.o = ker4.p;
|
|
|
+
|
|
|
+ oobReader.readDhlp(ker4, -1);
|
|
|
+
|
|
|
+ {
|
|
|
+ const BlendResult res = preProcessCorners<ColorDistance>(ker4, cfg);
|
|
|
+ clearAddTopL(preProcBuf[0], res.blend_k); //set 1st known corner for (0, yFirst)
|
|
|
+ }
|
|
|
+
|
|
|
+ for (int x = 0; x < srcWidth; ++x)
|
|
|
+ {
|
|
|
+ ker4.a = ker4.b; //shift previous kernel to the left
|
|
|
+ ker4.e = ker4.f; // -----------------
|
|
|
+ ker4.i = ker4.j; // | A | B | C | D |
|
|
|
+ ker4.m = ker4.n; // |---|---|---|---|
|
|
|
+ /**/ // | E | F | G | H | (x, yFirst - 1) is at position F
|
|
|
+ ker4.b = ker4.c; // |---|---|---|---|
|
|
|
+ ker4.f = ker4.g; // | I | J | K | L |
|
|
|
+ ker4.j = ker4.k; // |---|---|---|---|
|
|
|
+ ker4.n = ker4.o; // | M | N | O | P |
|
|
|
+ /**/ // -----------------
|
|
|
+ ker4.c = ker4.d;
|
|
|
+ ker4.g = ker4.h;
|
|
|
+ ker4.k = ker4.l;
|
|
|
+ ker4.o = ker4.p;
|
|
|
+
|
|
|
+ oobReader.readDhlp(ker4, x);
|
|
|
+
|
|
|
+ /* preprocessing blend result:
|
|
|
+ ---------
|
|
|
+ | F | G | evaluate corner between F, G, J, K
|
|
|
+ |---+---| current input pixel is at position F
|
|
|
+ | J | K |
|
|
|
+ --------- */
|
|
|
+ const BlendResult res = preProcessCorners<ColorDistance>(ker4, cfg);
|
|
|
+ addTopR(preProcBuf[x], res.blend_j); //set 2nd known corner for (x, yFirst)
|
|
|
+
|
|
|
+ if (x + 1 < srcWidth)
|
|
|
+ clearAddTopL(preProcBuf[x + 1], res.blend_k); //set 1st known corner for (x + 1, yFirst)
|
|
|
+ }
|
|
|
+ }
|
|
|
+ //------------------------------------------------------------------------------------
|
|
|
+
|
|
|
+ for (int y = yFirst; y < yLast; ++y)
|
|
|
+ {
|
|
|
+ uint32_t* out = trg + Scaler::scale * y * trgWidth; //consider MT "striped" access
|
|
|
+
|
|
|
+ const OobReader oobReader(src, srcWidth, srcHeight, y);
|
|
|
+
|
|
|
+ //initialize at position x = -1
|
|
|
+ Kernel_4x4 ker4 = {};
|
|
|
+ oobReader.readDhlp(ker4, -4); //hack: read a, e, i, m at x = -1
|
|
|
+ ker4.a = ker4.d;
|
|
|
+ ker4.e = ker4.h;
|
|
|
+ ker4.i = ker4.l;
|
|
|
+ ker4.m = ker4.p;
|
|
|
+
|
|
|
+ oobReader.readDhlp(ker4, -3);
|
|
|
+ ker4.b = ker4.d;
|
|
|
+ ker4.f = ker4.h;
|
|
|
+ ker4.j = ker4.l;
|
|
|
+ ker4.n = ker4.p;
|
|
|
+
|
|
|
+ oobReader.readDhlp(ker4, -2);
|
|
|
+ ker4.c = ker4.d;
|
|
|
+ ker4.g = ker4.h;
|
|
|
+ ker4.k = ker4.l;
|
|
|
+ ker4.o = ker4.p;
|
|
|
+
|
|
|
+ oobReader.readDhlp(ker4, -1);
|
|
|
+
|
|
|
+ unsigned char blend_xy1 = 0; //corner blending for current (x, y + 1) position
|
|
|
+ {
|
|
|
+ const BlendResult res = preProcessCorners<ColorDistance>(ker4, cfg);
|
|
|
+ clearAddTopL(blend_xy1, res.blend_k); //set 1st known corner for (0, y + 1) and buffer for use on next column
|
|
|
+
|
|
|
+ addBottomL(preProcBuf[0], res.blend_g); //set 3rd known corner for (0, y)
|
|
|
+ }
|
|
|
+
|
|
|
+ for (int x = 0; x < srcWidth; ++x, out += Scaler::scale)
|
|
|
+ {
|
|
|
+#if defined _MSC_VER && !defined NDEBUG
|
|
|
+ breakIntoDebugger = debugPixelX == x && debugPixelY == y;
|
|
|
+#endif
|
|
|
+ ker4.a = ker4.b; //shift previous kernel to the left
|
|
|
+ ker4.e = ker4.f; // -----------------
|
|
|
+ ker4.i = ker4.j; // | A | B | C | D |
|
|
|
+ ker4.m = ker4.n; // |---|---|---|---|
|
|
|
+ /**/ // | E | F | G | H | (x, y) is at position F
|
|
|
+ ker4.b = ker4.c; // |---|---|---|---|
|
|
|
+ ker4.f = ker4.g; // | I | J | K | L |
|
|
|
+ ker4.j = ker4.k; // |---|---|---|---|
|
|
|
+ ker4.n = ker4.o; // | M | N | O | P |
|
|
|
+ /**/ // -----------------
|
|
|
+ ker4.c = ker4.d;
|
|
|
+ ker4.g = ker4.h;
|
|
|
+ ker4.k = ker4.l;
|
|
|
+ ker4.o = ker4.p;
|
|
|
+
|
|
|
+ oobReader.readDhlp(ker4, x);
|
|
|
+
|
|
|
+ //evaluate the four corners on bottom-right of current pixel
|
|
|
+ unsigned char blend_xy = preProcBuf[x]; //for current (x, y) position
|
|
|
+ {
|
|
|
+ /* preprocessing blend result:
|
|
|
+ ---------
|
|
|
+ | F | G | evaluate corner between F, G, J, K
|
|
|
+ |---+---| current input pixel is at position F
|
|
|
+ | J | K |
|
|
|
+ --------- */
|
|
|
+ const BlendResult res = preProcessCorners<ColorDistance>(ker4, cfg);
|
|
|
+ addBottomR(blend_xy, res.blend_f); //all four corners of (x, y) have been determined at this point due to processing sequence!
|
|
|
+
|
|
|
+ addTopR(blend_xy1, res.blend_j); //set 2nd known corner for (x, y + 1)
|
|
|
+ preProcBuf[x] = blend_xy1; //store on current buffer position for use on next row
|
|
|
+
|
|
|
+ [[likely]] if (x + 1 < srcWidth)
|
|
|
+ {
|
|
|
+ //blend_xy1 -> blend_x1y1
|
|
|
+ clearAddTopL(blend_xy1, res.blend_k); //set 1st known corner for (x + 1, y + 1) and buffer for use on next column
|
|
|
+
|
|
|
+ addBottomL(preProcBuf[x + 1], res.blend_g); //set 3rd known corner for (x + 1, y)
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ //fill block of size scale * scale with the given color
|
|
|
+ fillBlock(out, trgWidth * sizeof(uint32_t), ker4.f, Scaler::scale, Scaler::scale);
|
|
|
+ //place *after* preprocessing step, to not overwrite the results while processing the last pixel!
|
|
|
+
|
|
|
+ //blend all four corners of current pixel
|
|
|
+ if (blendingNeeded(blend_xy))
|
|
|
+ {
|
|
|
+ const auto& ker3 = reinterpret_cast<const Kernel_3x3&>(ker4); //"The Things We Do for Perf"
|
|
|
+ blendPixel<Scaler, ColorDistance, ROT_0 >(ker3, out, trgWidth, blend_xy, cfg);
|
|
|
+ blendPixel<Scaler, ColorDistance, ROT_90 >(ker3, out, trgWidth, blend_xy, cfg);
|
|
|
+ blendPixel<Scaler, ColorDistance, ROT_180>(ker3, out, trgWidth, blend_xy, cfg);
|
|
|
+ blendPixel<Scaler, ColorDistance, ROT_270>(ker3, out, trgWidth, blend_xy, cfg);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+//------------------------------------------------------------------------------------
|
|
|
+
|
|
|
+template <class ColorGradient>
|
|
|
+struct Scaler2x : public ColorGradient
|
|
|
+{
|
|
|
+ static const int scale = 2;
|
|
|
+
|
|
|
+ template <unsigned int M, unsigned int N> //bring template function into scope for GCC
|
|
|
+ static void alphaGrad(uint32_t& pixBack, uint32_t pixFront) { ColorGradient::template alphaGrad<M, N>(pixBack, pixFront); }
|
|
|
+
|
|
|
+
|
|
|
+ template <class OutputMatrix>
|
|
|
+ static void blendLineShallow(uint32_t col, OutputMatrix& out)
|
|
|
+ {
|
|
|
+ alphaGrad<1, 4>(out.template ref<scale - 1, 0>(), col);
|
|
|
+ alphaGrad<3, 4>(out.template ref<scale - 1, 1>(), col);
|
|
|
+ }
|
|
|
+
|
|
|
+ template <class OutputMatrix>
|
|
|
+ static void blendLineSteep(uint32_t col, OutputMatrix& out)
|
|
|
+ {
|
|
|
+ alphaGrad<1, 4>(out.template ref<0, scale - 1>(), col);
|
|
|
+ alphaGrad<3, 4>(out.template ref<1, scale - 1>(), col);
|
|
|
+ }
|
|
|
+
|
|
|
+ template <class OutputMatrix>
|
|
|
+ static void blendLineSteepAndShallow(uint32_t col, OutputMatrix& out)
|
|
|
+ {
|
|
|
+ alphaGrad<1, 4>(out.template ref<1, 0>(), col);
|
|
|
+ alphaGrad<1, 4>(out.template ref<0, 1>(), col);
|
|
|
+ alphaGrad<5, 6>(out.template ref<1, 1>(), col); //[!] fixes 7/8 used in xBR
|
|
|
+ }
|
|
|
+
|
|
|
+ template <class OutputMatrix>
|
|
|
+ static void blendLineDiagonal(uint32_t col, OutputMatrix& out)
|
|
|
+ {
|
|
|
+ alphaGrad<1, 2>(out.template ref<1, 1>(), col);
|
|
|
+ }
|
|
|
+
|
|
|
+ template <class OutputMatrix>
|
|
|
+ static void blendCorner(uint32_t col, OutputMatrix& out)
|
|
|
+ {
|
|
|
+ //model a round corner
|
|
|
+ alphaGrad<21, 100>(out.template ref<1, 1>(), col); //exact: 1 - pi/4 = 0.2146018366
|
|
|
+ }
|
|
|
+};
|
|
|
+
|
|
|
+
|
|
|
+template <class ColorGradient>
|
|
|
+struct Scaler3x : public ColorGradient
|
|
|
+{
|
|
|
+ static const int scale = 3;
|
|
|
+
|
|
|
+ template <unsigned int M, unsigned int N> //bring template function into scope for GCC
|
|
|
+ static void alphaGrad(uint32_t& pixBack, uint32_t pixFront) { ColorGradient::template alphaGrad<M, N>(pixBack, pixFront); }
|
|
|
+
|
|
|
+
|
|
|
+ template <class OutputMatrix>
|
|
|
+ static void blendLineShallow(uint32_t col, OutputMatrix& out)
|
|
|
+ {
|
|
|
+ alphaGrad<1, 4>(out.template ref<scale - 1, 0>(), col);
|
|
|
+ alphaGrad<1, 4>(out.template ref<scale - 2, 2>(), col);
|
|
|
+
|
|
|
+ alphaGrad<3, 4>(out.template ref<scale - 1, 1>(), col);
|
|
|
+ out.template ref<scale - 1, 2>() = col;
|
|
|
+ }
|
|
|
+
|
|
|
+ template <class OutputMatrix>
|
|
|
+ static void blendLineSteep(uint32_t col, OutputMatrix& out)
|
|
|
+ {
|
|
|
+ alphaGrad<1, 4>(out.template ref<0, scale - 1>(), col);
|
|
|
+ alphaGrad<1, 4>(out.template ref<2, scale - 2>(), col);
|
|
|
+
|
|
|
+ alphaGrad<3, 4>(out.template ref<1, scale - 1>(), col);
|
|
|
+ out.template ref<2, scale - 1>() = col;
|
|
|
+ }
|
|
|
+
|
|
|
+ template <class OutputMatrix>
|
|
|
+ static void blendLineSteepAndShallow(uint32_t col, OutputMatrix& out)
|
|
|
+ {
|
|
|
+ alphaGrad<1, 4>(out.template ref<2, 0>(), col);
|
|
|
+ alphaGrad<1, 4>(out.template ref<0, 2>(), col);
|
|
|
+ alphaGrad<3, 4>(out.template ref<2, 1>(), col);
|
|
|
+ alphaGrad<3, 4>(out.template ref<1, 2>(), col);
|
|
|
+ out.template ref<2, 2>() = col;
|
|
|
+ }
|
|
|
+
|
|
|
+ template <class OutputMatrix>
|
|
|
+ static void blendLineDiagonal(uint32_t col, OutputMatrix& out)
|
|
|
+ {
|
|
|
+ alphaGrad<1, 8>(out.template ref<1, 2>(), col); //conflict with other rotations for this odd scale
|
|
|
+ alphaGrad<1, 8>(out.template ref<2, 1>(), col);
|
|
|
+ alphaGrad<7, 8>(out.template ref<2, 2>(), col); //
|
|
|
+ }
|
|
|
+
|
|
|
+ template <class OutputMatrix>
|
|
|
+ static void blendCorner(uint32_t col, OutputMatrix& out)
|
|
|
+ {
|
|
|
+ //model a round corner
|
|
|
+ alphaGrad<45, 100>(out.template ref<2, 2>(), col); //exact: 0.4545939598
|
|
|
+ //alphaGrad<7, 256>(out.template ref<2, 1>(), col); //0.02826017254 -> negligible + avoid conflicts with other rotations for this odd scale
|
|
|
+ //alphaGrad<7, 256>(out.template ref<1, 2>(), col); //0.02826017254
|
|
|
+ }
|
|
|
+};
|
|
|
+
|
|
|
+
|
|
|
+template <class ColorGradient>
|
|
|
+struct Scaler4x : public ColorGradient
|
|
|
+{
|
|
|
+ static const int scale = 4;
|
|
|
+
|
|
|
+ template <unsigned int M, unsigned int N> //bring template function into scope for GCC
|
|
|
+ static void alphaGrad(uint32_t& pixBack, uint32_t pixFront) { ColorGradient::template alphaGrad<M, N>(pixBack, pixFront); }
|
|
|
+
|
|
|
+
|
|
|
+ template <class OutputMatrix>
|
|
|
+ static void blendLineShallow(uint32_t col, OutputMatrix& out)
|
|
|
+ {
|
|
|
+ alphaGrad<1, 4>(out.template ref<scale - 1, 0>(), col);
|
|
|
+ alphaGrad<1, 4>(out.template ref<scale - 2, 2>(), col);
|
|
|
+
|
|
|
+ alphaGrad<3, 4>(out.template ref<scale - 1, 1>(), col);
|
|
|
+ alphaGrad<3, 4>(out.template ref<scale - 2, 3>(), col);
|
|
|
+
|
|
|
+ out.template ref<scale - 1, 2>() = col;
|
|
|
+ out.template ref<scale - 1, 3>() = col;
|
|
|
+ }
|
|
|
+
|
|
|
+ template <class OutputMatrix>
|
|
|
+ static void blendLineSteep(uint32_t col, OutputMatrix& out)
|
|
|
+ {
|
|
|
+ alphaGrad<1, 4>(out.template ref<0, scale - 1>(), col);
|
|
|
+ alphaGrad<1, 4>(out.template ref<2, scale - 2>(), col);
|
|
|
+
|
|
|
+ alphaGrad<3, 4>(out.template ref<1, scale - 1>(), col);
|
|
|
+ alphaGrad<3, 4>(out.template ref<3, scale - 2>(), col);
|
|
|
+
|
|
|
+ out.template ref<2, scale - 1>() = col;
|
|
|
+ out.template ref<3, scale - 1>() = col;
|
|
|
+ }
|
|
|
+
|
|
|
+ template <class OutputMatrix>
|
|
|
+ static void blendLineSteepAndShallow(uint32_t col, OutputMatrix& out)
|
|
|
+ {
|
|
|
+ alphaGrad<3, 4>(out.template ref<3, 1>(), col);
|
|
|
+ alphaGrad<3, 4>(out.template ref<1, 3>(), col);
|
|
|
+ alphaGrad<1, 4>(out.template ref<3, 0>(), col);
|
|
|
+ alphaGrad<1, 4>(out.template ref<0, 3>(), col);
|
|
|
+
|
|
|
+ alphaGrad<1, 3>(out.template ref<2, 2>(), col); //[!] fixes 1/4 used in xBR
|
|
|
+
|
|
|
+ out.template ref<3, 3>() = col;
|
|
|
+ out.template ref<3, 2>() = col;
|
|
|
+ out.template ref<2, 3>() = col;
|
|
|
+ }
|
|
|
+
|
|
|
+ template <class OutputMatrix>
|
|
|
+ static void blendLineDiagonal(uint32_t col, OutputMatrix& out)
|
|
|
+ {
|
|
|
+ alphaGrad<1, 2>(out.template ref<scale - 1, scale / 2 >(), col);
|
|
|
+ alphaGrad<1, 2>(out.template ref<scale - 2, scale / 2 + 1>(), col);
|
|
|
+ out.template ref<scale - 1, scale - 1>() = col;
|
|
|
+ }
|
|
|
+
|
|
|
+ template <class OutputMatrix>
|
|
|
+ static void blendCorner(uint32_t col, OutputMatrix& out)
|
|
|
+ {
|
|
|
+ //model a round corner
|
|
|
+ alphaGrad<68, 100>(out.template ref<3, 3>(), col); //exact: 0.6848532563
|
|
|
+ alphaGrad< 9, 100>(out.template ref<3, 2>(), col); //0.08677704501
|
|
|
+ alphaGrad< 9, 100>(out.template ref<2, 3>(), col); //0.08677704501
|
|
|
+ }
|
|
|
+};
|
|
|
+
|
|
|
+
|
|
|
+template <class ColorGradient>
|
|
|
+struct Scaler5x : public ColorGradient
|
|
|
+{
|
|
|
+ static const int scale = 5;
|
|
|
+
|
|
|
+ template <unsigned int M, unsigned int N> //bring template function into scope for GCC
|
|
|
+ static void alphaGrad(uint32_t& pixBack, uint32_t pixFront) { ColorGradient::template alphaGrad<M, N>(pixBack, pixFront); }
|
|
|
+
|
|
|
+
|
|
|
+ template <class OutputMatrix>
|
|
|
+ static void blendLineShallow(uint32_t col, OutputMatrix& out)
|
|
|
+ {
|
|
|
+ alphaGrad<1, 4>(out.template ref<scale - 1, 0>(), col);
|
|
|
+ alphaGrad<1, 4>(out.template ref<scale - 2, 2>(), col);
|
|
|
+ alphaGrad<1, 4>(out.template ref<scale - 3, 4>(), col);
|
|
|
+
|
|
|
+ alphaGrad<3, 4>(out.template ref<scale - 1, 1>(), col);
|
|
|
+ alphaGrad<3, 4>(out.template ref<scale - 2, 3>(), col);
|
|
|
+
|
|
|
+ out.template ref<scale - 1, 2>() = col;
|
|
|
+ out.template ref<scale - 1, 3>() = col;
|
|
|
+ out.template ref<scale - 1, 4>() = col;
|
|
|
+ out.template ref<scale - 2, 4>() = col;
|
|
|
+ }
|
|
|
+
|
|
|
+ template <class OutputMatrix>
|
|
|
+ static void blendLineSteep(uint32_t col, OutputMatrix& out)
|
|
|
+ {
|
|
|
+ alphaGrad<1, 4>(out.template ref<0, scale - 1>(), col);
|
|
|
+ alphaGrad<1, 4>(out.template ref<2, scale - 2>(), col);
|
|
|
+ alphaGrad<1, 4>(out.template ref<4, scale - 3>(), col);
|
|
|
+
|
|
|
+ alphaGrad<3, 4>(out.template ref<1, scale - 1>(), col);
|
|
|
+ alphaGrad<3, 4>(out.template ref<3, scale - 2>(), col);
|
|
|
+
|
|
|
+ out.template ref<2, scale - 1>() = col;
|
|
|
+ out.template ref<3, scale - 1>() = col;
|
|
|
+ out.template ref<4, scale - 1>() = col;
|
|
|
+ out.template ref<4, scale - 2>() = col;
|
|
|
+ }
|
|
|
+
|
|
|
+ template <class OutputMatrix>
|
|
|
+ static void blendLineSteepAndShallow(uint32_t col, OutputMatrix& out)
|
|
|
+ {
|
|
|
+ alphaGrad<1, 4>(out.template ref<0, scale - 1>(), col);
|
|
|
+ alphaGrad<1, 4>(out.template ref<2, scale - 2>(), col);
|
|
|
+ alphaGrad<3, 4>(out.template ref<1, scale - 1>(), col);
|
|
|
+
|
|
|
+ alphaGrad<1, 4>(out.template ref<scale - 1, 0>(), col);
|
|
|
+ alphaGrad<1, 4>(out.template ref<scale - 2, 2>(), col);
|
|
|
+ alphaGrad<3, 4>(out.template ref<scale - 1, 1>(), col);
|
|
|
+
|
|
|
+ alphaGrad<2, 3>(out.template ref<3, 3>(), col);
|
|
|
+
|
|
|
+ out.template ref<2, scale - 1>() = col;
|
|
|
+ out.template ref<3, scale - 1>() = col;
|
|
|
+ out.template ref<4, scale - 1>() = col;
|
|
|
+
|
|
|
+ out.template ref<scale - 1, 2>() = col;
|
|
|
+ out.template ref<scale - 1, 3>() = col;
|
|
|
+ }
|
|
|
+
|
|
|
+ template <class OutputMatrix>
|
|
|
+ static void blendLineDiagonal(uint32_t col, OutputMatrix& out)
|
|
|
+ {
|
|
|
+ alphaGrad<1, 8>(out.template ref<scale - 1, scale / 2 >(), col); //conflict with other rotations for this odd scale
|
|
|
+ alphaGrad<1, 8>(out.template ref<scale - 2, scale / 2 + 1>(), col);
|
|
|
+ alphaGrad<1, 8>(out.template ref<scale - 3, scale / 2 + 2>(), col); //
|
|
|
+
|
|
|
+ alphaGrad<7, 8>(out.template ref<4, 3>(), col);
|
|
|
+ alphaGrad<7, 8>(out.template ref<3, 4>(), col);
|
|
|
+
|
|
|
+ out.template ref<4, 4>() = col;
|
|
|
+ }
|
|
|
+
|
|
|
+ template <class OutputMatrix>
|
|
|
+ static void blendCorner(uint32_t col, OutputMatrix& out)
|
|
|
+ {
|
|
|
+ //model a round corner
|
|
|
+ alphaGrad<86, 100>(out.template ref<4, 4>(), col); //exact: 0.8631434088
|
|
|
+ alphaGrad<23, 100>(out.template ref<4, 3>(), col); //0.2306749731
|
|
|
+ alphaGrad<23, 100>(out.template ref<3, 4>(), col); //0.2306749731
|
|
|
+ //alphaGrad<1, 64>(out.template ref<4, 2>(), col); //0.01676812367 -> negligible + avoid conflicts with other rotations for this odd scale
|
|
|
+ //alphaGrad<1, 64>(out.template ref<2, 4>(), col); //0.01676812367
|
|
|
+ }
|
|
|
+};
|
|
|
+
|
|
|
+
|
|
|
+template <class ColorGradient>
|
|
|
+struct Scaler6x : public ColorGradient
|
|
|
+{
|
|
|
+ static const int scale = 6;
|
|
|
+
|
|
|
+ template <unsigned int M, unsigned int N> //bring template function into scope for GCC
|
|
|
+ static void alphaGrad(uint32_t& pixBack, uint32_t pixFront) { ColorGradient::template alphaGrad<M, N>(pixBack, pixFront); }
|
|
|
+
|
|
|
+
|
|
|
+ template <class OutputMatrix>
|
|
|
+ static void blendLineShallow(uint32_t col, OutputMatrix& out)
|
|
|
+ {
|
|
|
+ alphaGrad<1, 4>(out.template ref<scale - 1, 0>(), col);
|
|
|
+ alphaGrad<1, 4>(out.template ref<scale - 2, 2>(), col);
|
|
|
+ alphaGrad<1, 4>(out.template ref<scale - 3, 4>(), col);
|
|
|
+
|
|
|
+ alphaGrad<3, 4>(out.template ref<scale - 1, 1>(), col);
|
|
|
+ alphaGrad<3, 4>(out.template ref<scale - 2, 3>(), col);
|
|
|
+ alphaGrad<3, 4>(out.template ref<scale - 3, 5>(), col);
|
|
|
+
|
|
|
+ out.template ref<scale - 1, 2>() = col;
|
|
|
+ out.template ref<scale - 1, 3>() = col;
|
|
|
+ out.template ref<scale - 1, 4>() = col;
|
|
|
+ out.template ref<scale - 1, 5>() = col;
|
|
|
+
|
|
|
+ out.template ref<scale - 2, 4>() = col;
|
|
|
+ out.template ref<scale - 2, 5>() = col;
|
|
|
+ }
|
|
|
+
|
|
|
+ template <class OutputMatrix>
|
|
|
+ static void blendLineSteep(uint32_t col, OutputMatrix& out)
|
|
|
+ {
|
|
|
+ alphaGrad<1, 4>(out.template ref<0, scale - 1>(), col);
|
|
|
+ alphaGrad<1, 4>(out.template ref<2, scale - 2>(), col);
|
|
|
+ alphaGrad<1, 4>(out.template ref<4, scale - 3>(), col);
|
|
|
+
|
|
|
+ alphaGrad<3, 4>(out.template ref<1, scale - 1>(), col);
|
|
|
+ alphaGrad<3, 4>(out.template ref<3, scale - 2>(), col);
|
|
|
+ alphaGrad<3, 4>(out.template ref<5, scale - 3>(), col);
|
|
|
+
|
|
|
+ out.template ref<2, scale - 1>() = col;
|
|
|
+ out.template ref<3, scale - 1>() = col;
|
|
|
+ out.template ref<4, scale - 1>() = col;
|
|
|
+ out.template ref<5, scale - 1>() = col;
|
|
|
+
|
|
|
+ out.template ref<4, scale - 2>() = col;
|
|
|
+ out.template ref<5, scale - 2>() = col;
|
|
|
+ }
|
|
|
+
|
|
|
+ template <class OutputMatrix>
|
|
|
+ static void blendLineSteepAndShallow(uint32_t col, OutputMatrix& out)
|
|
|
+ {
|
|
|
+ alphaGrad<1, 4>(out.template ref<0, scale - 1>(), col);
|
|
|
+ alphaGrad<1, 4>(out.template ref<2, scale - 2>(), col);
|
|
|
+ alphaGrad<3, 4>(out.template ref<1, scale - 1>(), col);
|
|
|
+ alphaGrad<3, 4>(out.template ref<3, scale - 2>(), col);
|
|
|
+
|
|
|
+ alphaGrad<1, 4>(out.template ref<scale - 1, 0>(), col);
|
|
|
+ alphaGrad<1, 4>(out.template ref<scale - 2, 2>(), col);
|
|
|
+ alphaGrad<3, 4>(out.template ref<scale - 1, 1>(), col);
|
|
|
+ alphaGrad<3, 4>(out.template ref<scale - 2, 3>(), col);
|
|
|
+
|
|
|
+ out.template ref<2, scale - 1>() = col;
|
|
|
+ out.template ref<3, scale - 1>() = col;
|
|
|
+ out.template ref<4, scale - 1>() = col;
|
|
|
+ out.template ref<5, scale - 1>() = col;
|
|
|
+
|
|
|
+ out.template ref<4, scale - 2>() = col;
|
|
|
+ out.template ref<5, scale - 2>() = col;
|
|
|
+
|
|
|
+ out.template ref<scale - 1, 2>() = col;
|
|
|
+ out.template ref<scale - 1, 3>() = col;
|
|
|
+ }
|
|
|
+
|
|
|
+ template <class OutputMatrix>
|
|
|
+ static void blendLineDiagonal(uint32_t col, OutputMatrix& out)
|
|
|
+ {
|
|
|
+ alphaGrad<1, 2>(out.template ref<scale - 1, scale / 2 >(), col);
|
|
|
+ alphaGrad<1, 2>(out.template ref<scale - 2, scale / 2 + 1>(), col);
|
|
|
+ alphaGrad<1, 2>(out.template ref<scale - 3, scale / 2 + 2>(), col);
|
|
|
+
|
|
|
+ out.template ref<scale - 2, scale - 1>() = col;
|
|
|
+ out.template ref<scale - 1, scale - 1>() = col;
|
|
|
+ out.template ref<scale - 1, scale - 2>() = col;
|
|
|
+ }
|
|
|
+
|
|
|
+ template <class OutputMatrix>
|
|
|
+ static void blendCorner(uint32_t col, OutputMatrix& out)
|
|
|
+ {
|
|
|
+ //model a round corner
|
|
|
+ alphaGrad<97, 100>(out.template ref<5, 5>(), col); //exact: 0.9711013910
|
|
|
+ alphaGrad<42, 100>(out.template ref<4, 5>(), col); //0.4236372243
|
|
|
+ alphaGrad<42, 100>(out.template ref<5, 4>(), col); //0.4236372243
|
|
|
+ alphaGrad< 6, 100>(out.template ref<5, 3>(), col); //0.05652034508
|
|
|
+ alphaGrad< 6, 100>(out.template ref<3, 5>(), col); //0.05652034508
|
|
|
+ }
|
|
|
+};
|
|
|
+
|
|
|
+//------------------------------------------------------------------------------------
|
|
|
+
|
|
|
+struct ColorDistanceRGB
|
|
|
+{
|
|
|
+ static double dist(uint32_t pix1, uint32_t pix2, double luminanceWeight)
|
|
|
+ {
|
|
|
+ return distYCbCrBuffered(pix1, pix2);
|
|
|
+
|
|
|
+ //if (pix1 == pix2) //about 4% perf boost
|
|
|
+ // return 0;
|
|
|
+ //return distYCbCr(pix1, pix2, luminanceWeight);
|
|
|
+ }
|
|
|
+};
|
|
|
+
|
|
|
+struct ColorDistanceARGB
|
|
|
+{
|
|
|
+ static double dist(uint32_t pix1, uint32_t pix2, double luminanceWeight)
|
|
|
+ {
|
|
|
+ const double a1 = getAlpha(pix1) / 255.0 ;
|
|
|
+ const double a2 = getAlpha(pix2) / 255.0 ;
|
|
|
+ /*
|
|
|
+ Requirements for a color distance handling alpha channel: with a1, a2 in [0, 1]
|
|
|
+
|
|
|
+ 1. if a1 = a2, distance should be: a1 * distYCbCr()
|
|
|
+ 2. if a1 = 0, distance should be: a2 * distYCbCr(black, white) = a2 * 255
|
|
|
+ 3. if a1 = 1, ??? maybe: 255 * (1 - a2) + a2 * distYCbCr()
|
|
|
+ */
|
|
|
+
|
|
|
+ //return std::min(a1, a2) * distYCbCrBuffered(pix1, pix2) + 255 * abs(a1 - a2);
|
|
|
+ //=> following code is 15% faster:
|
|
|
+ const double d = distYCbCrBuffered(pix1, pix2);
|
|
|
+ if (a1 < a2)
|
|
|
+ return a1 * d + 255 * (a2 - a1);
|
|
|
+ else
|
|
|
+ return a2 * d + 255 * (a1 - a2);
|
|
|
+
|
|
|
+ //alternative? return std::sqrt(a1 * a2 * square(distYCbCrBuffered(pix1, pix2)) + square(255 * (a1 - a2)));
|
|
|
+ }
|
|
|
+};
|
|
|
+
|
|
|
+
|
|
|
+struct ColorDistanceUnbufferedARGB
|
|
|
+{
|
|
|
+ static double dist(uint32_t pix1, uint32_t pix2, double luminanceWeight)
|
|
|
+ {
|
|
|
+ const double a1 = getAlpha(pix1) / 255.0 ;
|
|
|
+ const double a2 = getAlpha(pix2) / 255.0 ;
|
|
|
+
|
|
|
+ const double d = distYCbCr(pix1, pix2, luminanceWeight);
|
|
|
+ if (a1 < a2)
|
|
|
+ return a1 * d + 255 * (a2 - a1);
|
|
|
+ else
|
|
|
+ return a2 * d + 255 * (a1 - a2);
|
|
|
+ }
|
|
|
+};
|
|
|
+
|
|
|
+
|
|
|
+struct ColorGradientRGB
|
|
|
+{
|
|
|
+ template <unsigned int M, unsigned int N>
|
|
|
+ static void alphaGrad(uint32_t& pixBack, uint32_t pixFront)
|
|
|
+ {
|
|
|
+ pixBack = gradientRGB<M, N>(pixFront, pixBack);
|
|
|
+ }
|
|
|
+};
|
|
|
+
|
|
|
+struct ColorGradientARGB
|
|
|
+{
|
|
|
+ template <unsigned int M, unsigned int N>
|
|
|
+ static void alphaGrad(uint32_t& pixBack, uint32_t pixFront)
|
|
|
+ {
|
|
|
+ pixBack = gradientARGB<M, N>(pixFront, pixBack);
|
|
|
+ }
|
|
|
+};
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+void xbrz::scale(size_t factor, const uint32_t* src, uint32_t* trg, int srcWidth, int srcHeight, ColorFormat colFmt, const xbrz::ScalerCfg& cfg, int yFirst, int yLast)
|
|
|
+{
|
|
|
+ if (factor == 1)
|
|
|
+ {
|
|
|
+ std::copy(src + yFirst * srcWidth, src + yLast * srcWidth, trg);
|
|
|
+ return;
|
|
|
+ }
|
|
|
+
|
|
|
+ static_assert(SCALE_FACTOR_MAX == 6);
|
|
|
+ switch (colFmt)
|
|
|
+ {
|
|
|
+ case ColorFormat::RGB:
|
|
|
+ switch (factor)
|
|
|
+ {
|
|
|
+ case 2:
|
|
|
+ return scaleImage<Scaler2x<ColorGradientRGB>, ColorDistanceRGB, OobReaderDuplicate>(src, trg, srcWidth, srcHeight, cfg, yFirst, yLast);
|
|
|
+ case 3:
|
|
|
+ return scaleImage<Scaler3x<ColorGradientRGB>, ColorDistanceRGB, OobReaderDuplicate>(src, trg, srcWidth, srcHeight, cfg, yFirst, yLast);
|
|
|
+ case 4:
|
|
|
+ return scaleImage<Scaler4x<ColorGradientRGB>, ColorDistanceRGB, OobReaderDuplicate>(src, trg, srcWidth, srcHeight, cfg, yFirst, yLast);
|
|
|
+ case 5:
|
|
|
+ return scaleImage<Scaler5x<ColorGradientRGB>, ColorDistanceRGB, OobReaderDuplicate>(src, trg, srcWidth, srcHeight, cfg, yFirst, yLast);
|
|
|
+ case 6:
|
|
|
+ return scaleImage<Scaler6x<ColorGradientRGB>, ColorDistanceRGB, OobReaderDuplicate>(src, trg, srcWidth, srcHeight, cfg, yFirst, yLast);
|
|
|
+ }
|
|
|
+ break;
|
|
|
+
|
|
|
+ case ColorFormat::ARGB:
|
|
|
+ switch (factor)
|
|
|
+ {
|
|
|
+ case 2:
|
|
|
+ return scaleImage<Scaler2x<ColorGradientARGB>, ColorDistanceARGB, OobReaderTransparent>(src, trg, srcWidth, srcHeight, cfg, yFirst, yLast);
|
|
|
+ case 3:
|
|
|
+ return scaleImage<Scaler3x<ColorGradientARGB>, ColorDistanceARGB, OobReaderTransparent>(src, trg, srcWidth, srcHeight, cfg, yFirst, yLast);
|
|
|
+ case 4:
|
|
|
+ return scaleImage<Scaler4x<ColorGradientARGB>, ColorDistanceARGB, OobReaderTransparent>(src, trg, srcWidth, srcHeight, cfg, yFirst, yLast);
|
|
|
+ case 5:
|
|
|
+ return scaleImage<Scaler5x<ColorGradientARGB>, ColorDistanceARGB, OobReaderTransparent>(src, trg, srcWidth, srcHeight, cfg, yFirst, yLast);
|
|
|
+ case 6:
|
|
|
+ return scaleImage<Scaler6x<ColorGradientARGB>, ColorDistanceARGB, OobReaderTransparent>(src, trg, srcWidth, srcHeight, cfg, yFirst, yLast);
|
|
|
+ }
|
|
|
+ break;
|
|
|
+
|
|
|
+ case ColorFormat::ARGB_UNBUFFERED:
|
|
|
+ switch (factor)
|
|
|
+ {
|
|
|
+ case 2:
|
|
|
+ return scaleImage<Scaler2x<ColorGradientARGB>, ColorDistanceUnbufferedARGB, OobReaderTransparent>(src, trg, srcWidth, srcHeight, cfg, yFirst, yLast);
|
|
|
+ case 3:
|
|
|
+ return scaleImage<Scaler3x<ColorGradientARGB>, ColorDistanceUnbufferedARGB, OobReaderTransparent>(src, trg, srcWidth, srcHeight, cfg, yFirst, yLast);
|
|
|
+ case 4:
|
|
|
+ return scaleImage<Scaler4x<ColorGradientARGB>, ColorDistanceUnbufferedARGB, OobReaderTransparent>(src, trg, srcWidth, srcHeight, cfg, yFirst, yLast);
|
|
|
+ case 5:
|
|
|
+ return scaleImage<Scaler5x<ColorGradientARGB>, ColorDistanceUnbufferedARGB, OobReaderTransparent>(src, trg, srcWidth, srcHeight, cfg, yFirst, yLast);
|
|
|
+ case 6:
|
|
|
+ return scaleImage<Scaler6x<ColorGradientARGB>, ColorDistanceUnbufferedARGB, OobReaderTransparent>(src, trg, srcWidth, srcHeight, cfg, yFirst, yLast);
|
|
|
+ }
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ assert(false);
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+bool xbrz::equalColorTest(uint32_t col1, uint32_t col2, ColorFormat colFmt, double luminanceWeight, double equalColorTolerance)
|
|
|
+{
|
|
|
+ switch (colFmt)
|
|
|
+ {
|
|
|
+ case ColorFormat::RGB:
|
|
|
+ return ColorDistanceRGB::dist(col1, col2, luminanceWeight) < equalColorTolerance;
|
|
|
+ case ColorFormat::ARGB:
|
|
|
+ return ColorDistanceARGB::dist(col1, col2, luminanceWeight) < equalColorTolerance;
|
|
|
+ case ColorFormat::ARGB_UNBUFFERED:
|
|
|
+ return ColorDistanceUnbufferedARGB::dist(col1, col2, luminanceWeight) < equalColorTolerance;
|
|
|
+ }
|
|
|
+ assert(false);
|
|
|
+ return false;
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+void xbrz::bilinearScale(const uint32_t* src, int srcWidth, int srcHeight,
|
|
|
+ /**/ uint32_t* trg, int trgWidth, int trgHeight)
|
|
|
+{
|
|
|
+ bilinearScale(src, srcWidth, srcHeight, srcWidth * sizeof(uint32_t),
|
|
|
+ trg, trgWidth, trgHeight, trgWidth * sizeof(uint32_t),
|
|
|
+ 0, trgHeight, [](uint32_t pix) { return pix; });
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+void xbrz::nearestNeighborScale(const uint32_t* src, int srcWidth, int srcHeight,
|
|
|
+ /**/ uint32_t* trg, int trgWidth, int trgHeight)
|
|
|
+{
|
|
|
+ nearestNeighborScale(src, srcWidth, srcHeight, srcWidth * sizeof(uint32_t),
|
|
|
+ trg, trgWidth, trgHeight, trgWidth * sizeof(uint32_t),
|
|
|
+ 0, trgHeight, [](uint32_t pix) { return pix; });
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+#if 0
|
|
|
+//#include <ppl.h>
|
|
|
+void bilinearScaleCpu(const uint32_t* src, int srcWidth, int srcHeight,
|
|
|
+ /**/ uint32_t* trg, int trgWidth, int trgHeight)
|
|
|
+{
|
|
|
+ const int TASK_GRANULARITY = 16;
|
|
|
+
|
|
|
+ concurrency::task_group tg;
|
|
|
+
|
|
|
+ for (int i = 0; i < trgHeight; i += TASK_GRANULARITY)
|
|
|
+ tg.run([=]
|
|
|
+ {
|
|
|
+ const int iLast = std::min(i + TASK_GRANULARITY, trgHeight);
|
|
|
+ xbrz::bilinearScale(src, srcWidth, srcHeight, srcWidth * sizeof(uint32_t),
|
|
|
+ trg, trgWidth, trgHeight, trgWidth * sizeof(uint32_t),
|
|
|
+ i, iLast, [](uint32_t pix) { return pix; });
|
|
|
+ });
|
|
|
+ tg.wait();
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+//Perf: AMP vs CPU: merely ~10% shorter runtime (scaling 1280x800 -> 1920x1080)
|
|
|
+//#include <amp.h>
|
|
|
+void bilinearScaleAmp(const uint32_t* src, int srcWidth, int srcHeight, //throw concurrency::runtime_exception
|
|
|
+ /**/ uint32_t* trg, int trgWidth, int trgHeight)
|
|
|
+{
|
|
|
+ //C++ AMP reference: https://msdn.microsoft.com/en-us/library/hh289390.aspx
|
|
|
+ //introduction to C++ AMP: https://msdn.microsoft.com/en-us/magazine/hh882446.aspx
|
|
|
+ using namespace concurrency;
|
|
|
+ //TODO: pitch
|
|
|
+
|
|
|
+ if (srcHeight <= 0 || srcWidth <= 0) return;
|
|
|
+
|
|
|
+ const float scaleX = static_cast<float>(trgWidth ) / srcWidth;
|
|
|
+ const float scaleY = static_cast<float>(trgHeight) / srcHeight;
|
|
|
+
|
|
|
+ array_view<const uint32_t, 2> srcView(srcHeight, srcWidth, src);
|
|
|
+ array_view< uint32_t, 2> trgView(trgHeight, trgWidth, trg);
|
|
|
+ trgView.discard_data();
|
|
|
+
|
|
|
+ parallel_for_each(trgView.extent, [=](index<2> idx) restrict(amp) //throw ?
|
|
|
+ {
|
|
|
+ const int y = idx[0];
|
|
|
+ const int x = idx[1];
|
|
|
+ //Perf notes:
|
|
|
+ // -> float-based calculation is (almost) 2x as fas as double!
|
|
|
+ // -> no noticeable improvement via tiling: https://msdn.microsoft.com/en-us/magazine/hh882447.aspx
|
|
|
+ // -> no noticeable improvement with restrict(amp,cpu)
|
|
|
+ // -> iterating over y-axis only is significantly slower!
|
|
|
+ // -> pre-calculating x,y-dependent variables in a buffer + array_view<> is ~ 20 % slower!
|
|
|
+ const int y1 = srcHeight * y / trgHeight;
|
|
|
+ int y2 = y1 + 1;
|
|
|
+ if (y2 == srcHeight) --y2;
|
|
|
+
|
|
|
+ const float yy1 = y / scaleY - y1;
|
|
|
+ const float y2y = 1 - yy1;
|
|
|
+ //-------------------------------------
|
|
|
+ const int x1 = srcWidth * x / trgWidth;
|
|
|
+ int x2 = x1 + 1;
|
|
|
+ if (x2 == srcWidth) --x2;
|
|
|
+
|
|
|
+ const float xx1 = x / scaleX - x1;
|
|
|
+ const float x2x = 1 - xx1;
|
|
|
+ //-------------------------------------
|
|
|
+ const float x2xy2y = x2x * y2y;
|
|
|
+ const float xx1y2y = xx1 * y2y;
|
|
|
+ const float x2xyy1 = x2x * yy1;
|
|
|
+ const float xx1yy1 = xx1 * yy1;
|
|
|
+
|
|
|
+ auto interpolate = [=](int offset)
|
|
|
+ {
|
|
|
+ /*
|
|
|
+ https://en.wikipedia.org/wiki/Bilinear_interpolation
|
|
|
+ (c11(x2 - x) + c21(x - x1)) * (y2 - y ) +
|
|
|
+ (c12(x2 - x) + c22(x - x1)) * (y - y1)
|
|
|
+ */
|
|
|
+ const auto c11 = (srcView(y1, x1) >> (8 * offset)) & 0xff;
|
|
|
+ const auto c21 = (srcView(y1, x2) >> (8 * offset)) & 0xff;
|
|
|
+ const auto c12 = (srcView(y2, x1) >> (8 * offset)) & 0xff;
|
|
|
+ const auto c22 = (srcView(y2, x2) >> (8 * offset)) & 0xff;
|
|
|
+
|
|
|
+ return c11 * x2xy2y + c21 * xx1y2y +
|
|
|
+ c12 * x2xyy1 + c22 * xx1yy1;
|
|
|
+ };
|
|
|
+
|
|
|
+ const float bi = interpolate(0);
|
|
|
+ const float gi = interpolate(1);
|
|
|
+ const float ri = interpolate(2);
|
|
|
+ const float ai = interpolate(3);
|
|
|
+
|
|
|
+ const auto b = static_cast<uint32_t>(bi + 0.5f);
|
|
|
+ const auto g = static_cast<uint32_t>(gi + 0.5f);
|
|
|
+ const auto r = static_cast<uint32_t>(ri + 0.5f);
|
|
|
+ const auto a = static_cast<uint32_t>(ai + 0.5f);
|
|
|
+
|
|
|
+ trgView(y, x) = (a << 24) | (r << 16) | (g << 8) | b;
|
|
|
+ });
|
|
|
+ trgView.synchronize(); //throw ?
|
|
|
+}
|
|
|
#endif
|
Ivan Savenko