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@@ -0,0 +1,1231 @@
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+/*
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+
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+ SDL_rotozoom.c - rotozoomer for 32bit or 8bit surfaces
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+
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+ LGPL (c) A. Schiffler
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+
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+*/
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+#include "stdafx.h"
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+#ifdef WIN32
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+#include <windows.h>
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+#endif
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+
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+#include <stdlib.h>
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+#include <string.h>
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+
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+#include "SDL_rotozoom.h"
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+
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+#define MAX(a,b) (((a) > (b)) ? (a) : (b))
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+
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+
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+/*
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+
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+ 32bit integer-factor averaging Shrinker
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+
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+ Shrinks 32bit RGBA/ABGR 'src' surface to 'dst' surface.
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+
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+*/
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+
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+int shrinkSurfaceRGBA(SDL_Surface * src, SDL_Surface * dst, int factorx, int factory)
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+{
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+ int x, y, dx, dy, sgap, dgap, ra, ga, ba, aa;
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+ int n_average;
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+ tColorRGBA *sp, *osp, *oosp;
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+ tColorRGBA *dp;
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+
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+ /*
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+ * Averaging integer shrink
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+ */
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+
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+ /* Precalculate division factor */
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+ n_average = factorx*factory;
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+
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+ /*
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+ * Scan destination
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+ */
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+ sp = (tColorRGBA *) src->pixels;
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+ sgap = src->pitch - src->w * 4;
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+
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+ dp = (tColorRGBA *) dst->pixels;
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+ dgap = dst->pitch - dst->w * 4;
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+
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+ for (y = 0; y < dst->h; y++) {
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+
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+ osp=sp;
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+ for (x = 0; x < dst->w; x++) {
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+
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+ /* Trace out source box and accumulate */
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+ oosp=sp;
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+ ra=ga=ba=aa=0;
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+ for (dy=0; dy < factory; dy++) {
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+ for (dx=0; dx < factorx; dx++) {
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+ ra += sp->r;
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+ ga += sp->g;
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+ ba += sp->b;
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+ aa += sp->a;
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+
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+ sp++;
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+ } // src dx loop
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+ sp = (tColorRGBA *)((Uint8*)sp + (src->pitch - 4*factorx)); // next y
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+ } // src dy loop
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+
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+ // next box-x
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+ sp = (tColorRGBA *)((Uint8*)oosp + 4*factorx);
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+
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+ /* Store result in destination */
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+ dp->r = ra/n_average;
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+ dp->g = ga/n_average;
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+ dp->b = ba/n_average;
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+ dp->a = aa/n_average;
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+
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+ /*
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+ * Advance destination pointer
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+ */
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+ dp++;
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+ } // dst x loop
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+
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+ // next box-y
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+ sp = (tColorRGBA *)((Uint8*)osp + src->pitch*factory);
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+
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+ /*
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+ * Advance destination pointers
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+ */
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+ dp = (tColorRGBA *) ((Uint8 *) dp + dgap);
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+ } // dst y loop
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+
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+ return (0);
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+}
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+
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+/*
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+
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+ 8bit integer-factor averaging Shrinker
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+
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+ Shrinks 8bit Y 'src' surface to 'dst' surface.
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+
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+*/
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+
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+int shrinkSurfaceY(SDL_Surface * src, SDL_Surface * dst, int factorx, int factory)
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+{
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+ int x, y, dx, dy, sgap, dgap, a;
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+ int n_average;
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+ Uint8 *sp, *osp, *oosp;
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+ Uint8 *dp;
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+
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+ /*
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+ * Averaging integer shrink
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+ */
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+
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+ /* Precalculate division factor */
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+ n_average = factorx*factory;
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+
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+ /*
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+ * Scan destination
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+ */
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+ sp = (Uint8 *) src->pixels;
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+ sgap = src->pitch - src->w;
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+
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+ dp = (Uint8 *) dst->pixels;
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+ dgap = dst->pitch - dst->w;
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+
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+ for (y = 0; y < dst->h; y++) {
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+
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+ osp=sp;
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+ for (x = 0; x < dst->w; x++) {
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+
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+ /* Trace out source box and accumulate */
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+ oosp=sp;
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+ a=0;
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+ for (dy=0; dy < factory; dy++) {
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+ for (dx=0; dx < factorx; dx++) {
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+ a += (*sp);
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+ sp++; // next x
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+ } // src dx loop
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+ sp = (Uint8 *)((Uint8*)sp + (src->pitch - factorx)); // next y
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+ } // src dy loop
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+
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+ // next box-x
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+ sp = (Uint8 *)((Uint8*)oosp + factorx);
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+
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+ /* Store result in destination */
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+ *dp = a/n_average;
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+
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+ /*
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+ * Advance destination pointer
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+ */
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+ dp++;
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+ } // dst x loop
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+
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+ // next box-y
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+ sp = (Uint8 *)((Uint8*)osp + src->pitch*factory);
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+
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+ /*
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+ * Advance destination pointers
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+ */
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+ dp = (Uint8 *)((Uint8 *)dp + dgap);
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+ } // dst y loop
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+
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+ return (0);
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+}
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+
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+/*
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+
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+ 32bit Zoomer with optional anti-aliasing by bilinear interpolation.
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+
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+ Zoomes 32bit RGBA/ABGR 'src' surface to 'dst' surface.
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+
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+*/
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+
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+int zoomSurfaceRGBA(SDL_Surface * src, SDL_Surface * dst, int flipx, int flipy, int smooth)
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+{
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+ int x, y, sx, sy, *sax, *say, *csax, *csay, csx, csy, ex, ey, t1, t2, sstep;
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+ tColorRGBA *c00, *c01, *c10, *c11;
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+ tColorRGBA *sp, *csp, *dp;
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+ int dgap;
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+
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+ /*
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+ * Variable setup
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+ */
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+ if (smooth) {
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+ /*
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+ * For interpolation: assume source dimension is one pixel
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+ */
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+ /*
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+ * smaller to avoid overflow on right and bottom edge.
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+ */
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+ sx = (int) (65536.0 * (float) (src->w - 1) / (float) dst->w);
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+ sy = (int) (65536.0 * (float) (src->h - 1) / (float) dst->h);
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+ } else {
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+ sx = (int) (65536.0 * (float) src->w / (float) dst->w);
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+ sy = (int) (65536.0 * (float) src->h / (float) dst->h);
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+ }
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+
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+ /*
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+ * Allocate memory for row increments
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+ */
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+ if ((sax = (int *) malloc((dst->w + 1) * sizeof(Uint32))) == NULL) {
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+ return (-1);
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+ }
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+ if ((say = (int *) malloc((dst->h + 1) * sizeof(Uint32))) == NULL) {
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+ free(sax);
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+ return (-1);
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+ }
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+
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+ /*
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+ * Precalculate row increments
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+ */
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+ sp = csp = (tColorRGBA *) src->pixels;
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+ dp = (tColorRGBA *) dst->pixels;
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+
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+ if (flipx) csp += (src->w-1);
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+ if (flipy) csp = (tColorRGBA*)( (Uint8*)csp + src->pitch*(src->h-1) );
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+
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+ csx = 0;
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+ csax = sax;
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+ for (x = 0; x <= dst->w; x++) {
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+ *csax = csx;
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+ csax++;
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+ csx &= 0xffff;
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+ csx += sx;
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+ }
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+ csy = 0;
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+ csay = say;
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+ for (y = 0; y <= dst->h; y++) {
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+ *csay = csy;
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+ csay++;
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+ csy &= 0xffff;
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+ csy += sy;
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+ }
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+
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+ dgap = dst->pitch - dst->w * 4;
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+
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+ /*
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+ * Switch between interpolating and non-interpolating code
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+ */
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+ if (smooth) {
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+
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+ /*
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+ * Interpolating Zoom
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+ */
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+
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+ /*
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+ * Scan destination
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+ */
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+ csay = say;
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+ for (y = 0; y < dst->h; y++) {
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+ /*
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+ * Setup color source pointers
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+ */
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+ c00 = csp;
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+ c01 = csp;
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+ c01++;
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+ c10 = (tColorRGBA *) ((Uint8 *) csp + src->pitch);
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+ c11 = c10;
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+ c11++;
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+ csax = sax;
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+ for (x = 0; x < dst->w; x++) {
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+
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+ /*
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+ * Interpolate colors
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+ */
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+ ex = (*csax & 0xffff);
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+ ey = (*csay & 0xffff);
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+ t1 = ((((c01->r - c00->r) * ex) >> 16) + c00->r) & 0xff;
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+ t2 = ((((c11->r - c10->r) * ex) >> 16) + c10->r) & 0xff;
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+ dp->r = (((t2 - t1) * ey) >> 16) + t1;
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+ t1 = ((((c01->g - c00->g) * ex) >> 16) + c00->g) & 0xff;
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+ t2 = ((((c11->g - c10->g) * ex) >> 16) + c10->g) & 0xff;
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+ dp->g = (((t2 - t1) * ey) >> 16) + t1;
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+ t1 = ((((c01->b - c00->b) * ex) >> 16) + c00->b) & 0xff;
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+ t2 = ((((c11->b - c10->b) * ex) >> 16) + c10->b) & 0xff;
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+ dp->b = (((t2 - t1) * ey) >> 16) + t1;
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+ t1 = ((((c01->a - c00->a) * ex) >> 16) + c00->a) & 0xff;
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+ t2 = ((((c11->a - c10->a) * ex) >> 16) + c10->a) & 0xff;
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+ dp->a = (((t2 - t1) * ey) >> 16) + t1;
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+
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+ /*
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+ * Advance source pointers
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+ */
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+ csax++;
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+ sstep = (*csax >> 16);
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+ c00 += sstep;
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+ c01 += sstep;
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+ c10 += sstep;
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+ c11 += sstep;
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+ /*
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+ * Advance destination pointer
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+ */
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+ dp++;
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+ }
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+ /*
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+ * Advance source pointer
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+ */
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+ csay++;
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+ csp = (tColorRGBA *) ((Uint8 *) csp + (*csay >> 16) * src->pitch);
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+ /*
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+ * Advance destination pointers
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+ */
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+ dp = (tColorRGBA *) ((Uint8 *) dp + dgap);
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+ }
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+
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+ } else {
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+
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+ /*
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+ * Non-Interpolating Zoom
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+ */
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+
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+ csay = say;
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+ for (y = 0; y < dst->h; y++) {
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+ sp = csp;
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+ csax = sax;
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+ for (x = 0; x < dst->w; x++) {
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+ /*
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+ * Draw
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+ */
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+ *dp = *sp;
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+ /*
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+ * Advance source pointers
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+ */
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+ csax++;
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+ sstep = (*csax >> 16);
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+ if (flipx) sstep = -sstep;
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+ sp += sstep;
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+ /*
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+ * Advance destination pointer
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+ */
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+ dp++;
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+ }
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+ /*
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+ * Advance source pointer
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+ */
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+ csay++;
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+ sstep = (*csay >> 16) * src->pitch;
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+ if (flipy) sstep = -sstep;
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+ csp = (tColorRGBA *) ((Uint8 *) csp + sstep);
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+
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+ /*
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+ * Advance destination pointers
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+ */
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+ dp = (tColorRGBA *) ((Uint8 *) dp + dgap);
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+ }
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+
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+ }
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+
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+ /*
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+ * Remove temp arrays
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+ */
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+ free(sax);
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+ free(say);
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+
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+ return (0);
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+}
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+
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+/*
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+
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+ 8bit Zoomer without smoothing.
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+
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+ Zoomes 8bit palette/Y 'src' surface to 'dst' surface.
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+
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+*/
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+
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+int zoomSurfaceY(SDL_Surface * src, SDL_Surface * dst, int flipx, int flipy)
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+{
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+ Uint32 x, y, sx, sy, *sax, *say, *csax, *csay, csx, csy;
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+ Uint8 *sp, *dp, *csp;
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+ int dgap;
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+
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+ /*
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+ * Variable setup
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+ */
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+ sx = (Uint32) (65536.0 * (float) src->w / (float) dst->w);
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+ sy = (Uint32) (65536.0 * (float) src->h / (float) dst->h);
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+
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+ /*
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+ * Allocate memory for row increments
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+ */
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+ if ((sax = (Uint32 *) malloc(dst->w * sizeof(Uint32))) == NULL) {
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+ return (-1);
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+ }
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+ if ((say = (Uint32 *) malloc(dst->h * sizeof(Uint32))) == NULL) {
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+ if (sax != NULL) {
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+ free(sax);
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+ }
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+ return (-1);
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+ }
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+
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+ /*
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+ * Precalculate row increments
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+ */
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+ csx = 0;
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+ csax = sax;
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+ for (x = 0; x < dst->w; x++) {
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+ csx += sx;
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+ *csax = (csx >> 16);
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+ csx &= 0xffff;
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+ csax++;
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+ }
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+ csy = 0;
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+ csay = say;
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+ for (y = 0; y < dst->h; y++) {
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+ csy += sy;
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+ *csay = (csy >> 16);
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+ csy &= 0xffff;
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+ csay++;
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+ }
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+
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+ csx = 0;
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+ csax = sax;
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+ for (x = 0; x < dst->w; x++) {
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+ csx += (*csax);
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+ csax++;
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+ }
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+ csy = 0;
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+ csay = say;
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+ for (y = 0; y < dst->h; y++) {
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+ csy += (*csay);
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+ csay++;
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+ }
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+
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+ /*
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+ * Pointer setup
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+ */
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+ sp = csp = (Uint8 *) src->pixels;
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+ dp = (Uint8 *) dst->pixels;
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+ dgap = dst->pitch - dst->w;
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+
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+ /*
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+ * Draw
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+ */
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+ csay = say;
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+ for (y = 0; y < dst->h; y++) {
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+ csax = sax;
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+ sp = csp;
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+ for (x = 0; x < dst->w; x++) {
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|
|
+ /*
|
|
|
+ * Draw
|
|
|
+ */
|
|
|
+ *dp = *sp;
|
|
|
+ /*
|
|
|
+ * Advance source pointers
|
|
|
+ */
|
|
|
+ sp += (*csax);
|
|
|
+ csax++;
|
|
|
+ /*
|
|
|
+ * Advance destination pointer
|
|
|
+ */
|
|
|
+ dp++;
|
|
|
+ }
|
|
|
+ /*
|
|
|
+ * Advance source pointer (for row)
|
|
|
+ */
|
|
|
+ csp += ((*csay) * src->pitch);
|
|
|
+ csay++;
|
|
|
+ /*
|
|
|
+ * Advance destination pointers
|
|
|
+ */
|
|
|
+ dp += dgap;
|
|
|
+ }
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Remove temp arrays
|
|
|
+ */
|
|
|
+ free(sax);
|
|
|
+ free(say);
|
|
|
+
|
|
|
+ return (0);
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+
|
|
|
+ 32bit Rotozoomer with optional anti-aliasing by bilinear interpolation.
|
|
|
+
|
|
|
+ Rotates and zoomes 32bit RGBA/ABGR 'src' surface to 'dst' surface.
|
|
|
+
|
|
|
+*/
|
|
|
+
|
|
|
+void transformSurfaceRGBA(SDL_Surface * src, SDL_Surface * dst, int cx, int cy, int isin, int icos, int flipx, int flipy, int smooth)
|
|
|
+{
|
|
|
+ int x, y, t1, t2, dx, dy, xd, yd, sdx, sdy, ax, ay, ex, ey, sw, sh;
|
|
|
+ tColorRGBA c00, c01, c10, c11;
|
|
|
+ tColorRGBA *pc, *sp;
|
|
|
+ int gap;
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Variable setup
|
|
|
+ */
|
|
|
+ xd = ((src->w - dst->w) << 15);
|
|
|
+ yd = ((src->h - dst->h) << 15);
|
|
|
+ ax = (cx << 16) - (icos * cx);
|
|
|
+ ay = (cy << 16) - (isin * cx);
|
|
|
+ sw = src->w - 1;
|
|
|
+ sh = src->h - 1;
|
|
|
+ pc = (tColorRGBA*)dst->pixels;
|
|
|
+ gap = dst->pitch - dst->w * 4;
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Switch between interpolating and non-interpolating code
|
|
|
+ */
|
|
|
+ if (smooth) {
|
|
|
+ for (y = 0; y < dst->h; y++) {
|
|
|
+ dy = cy - y;
|
|
|
+ sdx = (ax + (isin * dy)) + xd;
|
|
|
+ sdy = (ay - (icos * dy)) + yd;
|
|
|
+ for (x = 0; x < dst->w; x++) {
|
|
|
+ dx = (sdx >> 16);
|
|
|
+ dy = (sdy >> 16);
|
|
|
+ if ((dx >= -1) && (dy >= -1) && (dx < src->w) && (dy < src->h)) {
|
|
|
+ if ((dx >= 0) && (dy >= 0) && (dx < sw) && (dy < sh)) {
|
|
|
+ sp = (tColorRGBA *) ((Uint8 *) src->pixels + src->pitch * dy);
|
|
|
+ sp += dx;
|
|
|
+ c00 = *sp;
|
|
|
+ sp += 1;
|
|
|
+ c01 = *sp;
|
|
|
+ sp = (tColorRGBA *) ((Uint8 *) sp + src->pitch);
|
|
|
+ sp -= 1;
|
|
|
+ c10 = *sp;
|
|
|
+ sp += 1;
|
|
|
+ c11 = *sp;
|
|
|
+ } else if ((dx == sw) && (dy == sh)) {
|
|
|
+ sp = (tColorRGBA *) ((Uint8 *) src->pixels + src->pitch * dy);
|
|
|
+ sp += dx;
|
|
|
+ c00 = *sp;
|
|
|
+ c01 = *sp;
|
|
|
+ c10 = *sp;
|
|
|
+ c11 = *sp;
|
|
|
+ } else if ((dx == -1) && (dy == -1)) {
|
|
|
+ sp = (tColorRGBA *) (src->pixels);
|
|
|
+ c00 = *sp;
|
|
|
+ c01 = *sp;
|
|
|
+ c10 = *sp;
|
|
|
+ c11 = *sp;
|
|
|
+ } else if ((dx == -1) && (dy == sh)) {
|
|
|
+ sp = (tColorRGBA *) (src->pixels);
|
|
|
+ sp = (tColorRGBA *) ((Uint8 *) src->pixels + src->pitch * dy);
|
|
|
+ c00 = *sp;
|
|
|
+ c01 = *sp;
|
|
|
+ c10 = *sp;
|
|
|
+ c11 = *sp;
|
|
|
+ } else if ((dx == sw) && (dy == -1)) {
|
|
|
+ sp = (tColorRGBA *) (src->pixels);
|
|
|
+ sp += dx;
|
|
|
+ c00 = *sp;
|
|
|
+ c01 = *sp;
|
|
|
+ c10 = *sp;
|
|
|
+ c11 = *sp;
|
|
|
+ } else if (dx == -1) {
|
|
|
+ sp = (tColorRGBA *) ((Uint8 *) src->pixels + src->pitch * dy);
|
|
|
+ c00 = *sp;
|
|
|
+ c01 = *sp;
|
|
|
+ c10 = *sp;
|
|
|
+ sp = (tColorRGBA *) ((Uint8 *) sp + src->pitch);
|
|
|
+ c11 = *sp;
|
|
|
+ } else if (dy == -1) {
|
|
|
+ sp = (tColorRGBA *) (src->pixels);
|
|
|
+ sp += dx;
|
|
|
+ c00 = *sp;
|
|
|
+ c01 = *sp;
|
|
|
+ c10 = *sp;
|
|
|
+ sp += 1;
|
|
|
+ c11 = *sp;
|
|
|
+ } else if (dx == sw) {
|
|
|
+ sp = (tColorRGBA *) ((Uint8 *) src->pixels + src->pitch * dy);
|
|
|
+ sp += dx;
|
|
|
+ c00 = *sp;
|
|
|
+ c01 = *sp;
|
|
|
+ sp = (tColorRGBA *) ((Uint8 *) sp + src->pitch);
|
|
|
+ c10 = *sp;
|
|
|
+ c11 = *sp;
|
|
|
+ } else if (dy == sh) {
|
|
|
+ sp = (tColorRGBA *) ((Uint8 *) src->pixels + src->pitch * dy);
|
|
|
+ sp += dx;
|
|
|
+ c00 = *sp;
|
|
|
+ sp += 1;
|
|
|
+ c01 = *sp;
|
|
|
+ c10 = *sp;
|
|
|
+ c11 = *sp;
|
|
|
+ }
|
|
|
+ /*
|
|
|
+ * Interpolate colors
|
|
|
+ */
|
|
|
+ ex = (sdx & 0xffff);
|
|
|
+ ey = (sdy & 0xffff);
|
|
|
+ t1 = ((((c01.r - c00.r) * ex) >> 16) + c00.r) & 0xff;
|
|
|
+ t2 = ((((c11.r - c10.r) * ex) >> 16) + c10.r) & 0xff;
|
|
|
+ pc->r = (((t2 - t1) * ey) >> 16) + t1;
|
|
|
+ t1 = ((((c01.g - c00.g) * ex) >> 16) + c00.g) & 0xff;
|
|
|
+ t2 = ((((c11.g - c10.g) * ex) >> 16) + c10.g) & 0xff;
|
|
|
+ pc->g = (((t2 - t1) * ey) >> 16) + t1;
|
|
|
+ t1 = ((((c01.b - c00.b) * ex) >> 16) + c00.b) & 0xff;
|
|
|
+ t2 = ((((c11.b - c10.b) * ex) >> 16) + c10.b) & 0xff;
|
|
|
+ pc->b = (((t2 - t1) * ey) >> 16) + t1;
|
|
|
+ t1 = ((((c01.a - c00.a) * ex) >> 16) + c00.a) & 0xff;
|
|
|
+ t2 = ((((c11.a - c10.a) * ex) >> 16) + c10.a) & 0xff;
|
|
|
+ pc->a = (((t2 - t1) * ey) >> 16) + t1;
|
|
|
+ }
|
|
|
+ sdx += icos;
|
|
|
+ sdy += isin;
|
|
|
+ pc++;
|
|
|
+ }
|
|
|
+ pc = (tColorRGBA *) ((Uint8 *) pc + gap);
|
|
|
+ }
|
|
|
+ } else {
|
|
|
+ for (y = 0; y < dst->h; y++) {
|
|
|
+ dy = cy - y;
|
|
|
+ sdx = (ax + (isin * dy)) + xd;
|
|
|
+ sdy = (ay - (icos * dy)) + yd;
|
|
|
+ for (x = 0; x < dst->w; x++) {
|
|
|
+ dx = (short) (sdx >> 16);
|
|
|
+ dy = (short) (sdy >> 16);
|
|
|
+ if (flipx) dx = (src->w-1)-dx;
|
|
|
+ if (flipy) dy = (src->h-1)-dy;
|
|
|
+ if ((dx >= 0) && (dy >= 0) && (dx < src->w) && (dy < src->h)) {
|
|
|
+ sp = (tColorRGBA *) ((Uint8 *) src->pixels + src->pitch * dy);
|
|
|
+ sp += dx;
|
|
|
+ *pc = *sp;
|
|
|
+ }
|
|
|
+ sdx += icos;
|
|
|
+ sdy += isin;
|
|
|
+ pc++;
|
|
|
+ }
|
|
|
+ pc = (tColorRGBA *) ((Uint8 *) pc + gap);
|
|
|
+ }
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+
|
|
|
+ 8bit Rotozoomer without smoothing
|
|
|
+
|
|
|
+ Rotates and zoomes 8bit palette/Y 'src' surface to 'dst' surface.
|
|
|
+
|
|
|
+*/
|
|
|
+
|
|
|
+void transformSurfaceY(SDL_Surface * src, SDL_Surface * dst, int cx, int cy, int isin, int icos)
|
|
|
+{
|
|
|
+ int x, y, dx, dy, xd, yd, sdx, sdy, ax, ay, sw, sh;
|
|
|
+ tColorY *pc, *sp;
|
|
|
+ int gap;
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Variable setup
|
|
|
+ */
|
|
|
+ xd = ((src->w - dst->w) << 15);
|
|
|
+ yd = ((src->h - dst->h) << 15);
|
|
|
+ ax = (cx << 16) - (icos * cx);
|
|
|
+ ay = (cy << 16) - (isin * cx);
|
|
|
+ sw = src->w - 1;
|
|
|
+ sh = src->h - 1;
|
|
|
+ pc = (tColorY*)dst->pixels;
|
|
|
+ gap = dst->pitch - dst->w;
|
|
|
+ /*
|
|
|
+ * Clear surface to colorkey
|
|
|
+ */
|
|
|
+ memset(pc, (unsigned char) (src->format->colorkey & 0xff), dst->pitch * dst->h);
|
|
|
+ /*
|
|
|
+ * Iterate through destination surface
|
|
|
+ */
|
|
|
+ for (y = 0; y < dst->h; y++) {
|
|
|
+ dy = cy - y;
|
|
|
+ sdx = (ax + (isin * dy)) + xd;
|
|
|
+ sdy = (ay - (icos * dy)) + yd;
|
|
|
+ for (x = 0; x < dst->w; x++) {
|
|
|
+ dx = (short) (sdx >> 16);
|
|
|
+ dy = (short) (sdy >> 16);
|
|
|
+ if ((dx >= 0) && (dy >= 0) && (dx < src->w) && (dy < src->h)) {
|
|
|
+ sp = (tColorY *) (src->pixels);
|
|
|
+ sp += (src->pitch * dy + dx);
|
|
|
+ *pc = *sp;
|
|
|
+ }
|
|
|
+ sdx += icos;
|
|
|
+ sdy += isin;
|
|
|
+ pc++;
|
|
|
+ }
|
|
|
+ pc += gap;
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+
|
|
|
+ rotozoomSurface()
|
|
|
+
|
|
|
+ Rotates and zoomes a 32bit or 8bit 'src' surface to newly created 'dst' surface.
|
|
|
+ 'angle' is the rotation in degrees. 'zoom' a scaling factor. If 'smooth' is 1
|
|
|
+ then the destination 32bit surface is anti-aliased. If the surface is not 8bit
|
|
|
+ or 32bit RGBA/ABGR it will be converted into a 32bit RGBA format on the fly.
|
|
|
+
|
|
|
+*/
|
|
|
+
|
|
|
+#define VALUE_LIMIT 0.001
|
|
|
+
|
|
|
+
|
|
|
+/* Local rotozoom-size function with trig result return */
|
|
|
+
|
|
|
+void rotozoomSurfaceSizeTrig(int width, int height, double angle, double zoomx, double zoomy, int *dstwidth, int *dstheight,
|
|
|
+ double *canglezoom, double *sanglezoom)
|
|
|
+{
|
|
|
+ double x, y, cx, cy, sx, sy;
|
|
|
+ double radangle;
|
|
|
+ int dstwidthhalf, dstheighthalf;
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Determine destination width and height by rotating a centered source box
|
|
|
+ */
|
|
|
+ radangle = angle * (M_PI / 180.0);
|
|
|
+ *sanglezoom = sin(radangle);
|
|
|
+ *canglezoom = cos(radangle);
|
|
|
+ *sanglezoom *= zoomx;
|
|
|
+ *canglezoom *= zoomx;
|
|
|
+ x = width / 2;
|
|
|
+ y = height / 2;
|
|
|
+ cx = *canglezoom * x;
|
|
|
+ cy = *canglezoom * y;
|
|
|
+ sx = *sanglezoom * x;
|
|
|
+ sy = *sanglezoom * y;
|
|
|
+
|
|
|
+ dstwidthhalf = MAX((int)
|
|
|
+ ceil(MAX(MAX(MAX(fabs(cx + sy), fabs(cx - sy)), fabs(-cx + sy)), fabs(-cx - sy))), 1);
|
|
|
+ dstheighthalf = MAX((int)
|
|
|
+ ceil(MAX(MAX(MAX(fabs(sx + cy), fabs(sx - cy)), fabs(-sx + cy)), fabs(-sx - cy))), 1);
|
|
|
+ *dstwidth = 2 * dstwidthhalf;
|
|
|
+ *dstheight = 2 * dstheighthalf;
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+/* Publically available rotozoom-size function */
|
|
|
+
|
|
|
+void rotozoomSurfaceSizeXY(int width, int height, double angle, double zoomx, double zoomy, int *dstwidth, int *dstheight)
|
|
|
+{
|
|
|
+ double dummy_sanglezoom, dummy_canglezoom;
|
|
|
+
|
|
|
+ rotozoomSurfaceSizeTrig(width, height, angle, zoomx, zoomy, dstwidth, dstheight, &dummy_sanglezoom, &dummy_canglezoom);
|
|
|
+}
|
|
|
+
|
|
|
+/* Publically available rotozoom-size function */
|
|
|
+
|
|
|
+void rotozoomSurfaceSize(int width, int height, double angle, double zoom, int *dstwidth, int *dstheight)
|
|
|
+{
|
|
|
+ double dummy_sanglezoom, dummy_canglezoom;
|
|
|
+
|
|
|
+ rotozoomSurfaceSizeTrig(width, height, angle, zoom, zoom, dstwidth, dstheight, &dummy_sanglezoom, &dummy_canglezoom);
|
|
|
+}
|
|
|
+
|
|
|
+/* Publically available rotozoom function */
|
|
|
+
|
|
|
+SDL_Surface *rotozoomSurface(SDL_Surface * src, double angle, double zoom, int smooth)
|
|
|
+{
|
|
|
+ return rotozoomSurfaceXY(src, angle, zoom, zoom, smooth);
|
|
|
+}
|
|
|
+
|
|
|
+/* Publically available rotozoom function */
|
|
|
+
|
|
|
+SDL_Surface *rotozoomSurfaceXY(SDL_Surface * src, double angle, double zoomx, double zoomy, int smooth)
|
|
|
+{
|
|
|
+ SDL_Surface *rz_src;
|
|
|
+ SDL_Surface *rz_dst;
|
|
|
+ double zoominv;
|
|
|
+ double sanglezoom, canglezoom, sanglezoominv, canglezoominv;
|
|
|
+ int dstwidthhalf, dstwidth, dstheighthalf, dstheight;
|
|
|
+ int is32bit;
|
|
|
+ int i, src_converted;
|
|
|
+ int flipx,flipy;
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Sanity check
|
|
|
+ */
|
|
|
+ if (src == NULL)
|
|
|
+ return (NULL);
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Determine if source surface is 32bit or 8bit
|
|
|
+ */
|
|
|
+ is32bit = (src->format->BitsPerPixel == 32);
|
|
|
+ if ((is32bit) || (src->format->BitsPerPixel == 8)) {
|
|
|
+ /*
|
|
|
+ * Use source surface 'as is'
|
|
|
+ */
|
|
|
+ rz_src = src;
|
|
|
+ src_converted = 0;
|
|
|
+ } else {
|
|
|
+ /*
|
|
|
+ * New source surface is 32bit with a defined RGBA ordering
|
|
|
+ */
|
|
|
+ rz_src =
|
|
|
+ SDL_CreateRGBSurface(SDL_SWSURFACE, src->w, src->h, 32, 0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000);
|
|
|
+ SDL_BlitSurface(src, NULL, rz_src, NULL);
|
|
|
+ src_converted = 1;
|
|
|
+ is32bit = 1;
|
|
|
+ }
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Sanity check zoom factor
|
|
|
+ */
|
|
|
+ flipx = (zoomx<0);
|
|
|
+ if (flipx) zoomx=-zoomx;
|
|
|
+ flipy = (zoomy<0);
|
|
|
+ if (flipy) zoomy=-zoomy;
|
|
|
+ if (zoomx < VALUE_LIMIT) zoomx = VALUE_LIMIT;
|
|
|
+ if (zoomy < VALUE_LIMIT) zoomy = VALUE_LIMIT;
|
|
|
+ zoominv = 65536.0 / (zoomx * zoomx);
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Check if we have a rotozoom or just a zoom
|
|
|
+ */
|
|
|
+ if (fabs(angle) > VALUE_LIMIT) {
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Angle!=0: full rotozoom
|
|
|
+ */
|
|
|
+ /*
|
|
|
+ * -----------------------
|
|
|
+ */
|
|
|
+
|
|
|
+ /* Determine target size */
|
|
|
+ rotozoomSurfaceSizeTrig(rz_src->w, rz_src->h, angle, zoomx, zoomy, &dstwidth, &dstheight, &canglezoom, &sanglezoom);
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Calculate target factors from sin/cos and zoom
|
|
|
+ */
|
|
|
+ sanglezoominv = sanglezoom;
|
|
|
+ canglezoominv = canglezoom;
|
|
|
+ sanglezoominv *= zoominv;
|
|
|
+ canglezoominv *= zoominv;
|
|
|
+
|
|
|
+ /* Calculate half size */
|
|
|
+ dstwidthhalf = dstwidth / 2;
|
|
|
+ dstheighthalf = dstheight / 2;
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Alloc space to completely contain the rotated surface
|
|
|
+ */
|
|
|
+ rz_dst = NULL;
|
|
|
+ if (is32bit) {
|
|
|
+ /*
|
|
|
+ * Target surface is 32bit with source RGBA/ABGR ordering
|
|
|
+ */
|
|
|
+ rz_dst =
|
|
|
+ SDL_CreateRGBSurface(SDL_SWSURFACE, dstwidth, dstheight, 32,
|
|
|
+ rz_src->format->Rmask, rz_src->format->Gmask,
|
|
|
+ rz_src->format->Bmask, rz_src->format->Amask);
|
|
|
+ } else {
|
|
|
+ /*
|
|
|
+ * Target surface is 8bit
|
|
|
+ */
|
|
|
+ rz_dst = SDL_CreateRGBSurface(SDL_SWSURFACE, dstwidth, dstheight, 8, 0, 0, 0, 0);
|
|
|
+ }
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Lock source surface
|
|
|
+ */
|
|
|
+ SDL_LockSurface(rz_src);
|
|
|
+ /*
|
|
|
+ * Check which kind of surface we have
|
|
|
+ */
|
|
|
+ if (is32bit) {
|
|
|
+ /*
|
|
|
+ * Call the 32bit transformation routine to do the rotation (using alpha)
|
|
|
+ */
|
|
|
+ transformSurfaceRGBA(rz_src, rz_dst, dstwidthhalf, dstheighthalf,
|
|
|
+ (int) (sanglezoominv), (int) (canglezoominv),
|
|
|
+ flipx, flipy,
|
|
|
+ smooth);
|
|
|
+ /*
|
|
|
+ * Turn on source-alpha support
|
|
|
+ */
|
|
|
+ SDL_SetAlpha(rz_dst, SDL_SRCALPHA, 255);
|
|
|
+ } else {
|
|
|
+ /*
|
|
|
+ * Copy palette and colorkey info
|
|
|
+ */
|
|
|
+ for (i = 0; i < rz_src->format->palette->ncolors; i++) {
|
|
|
+ rz_dst->format->palette->colors[i] = rz_src->format->palette->colors[i];
|
|
|
+ }
|
|
|
+ rz_dst->format->palette->ncolors = rz_src->format->palette->ncolors;
|
|
|
+ /*
|
|
|
+ * Call the 8bit transformation routine to do the rotation
|
|
|
+ */
|
|
|
+ transformSurfaceY(rz_src, rz_dst, dstwidthhalf, dstheighthalf,
|
|
|
+ (int) (sanglezoominv), (int) (canglezoominv));
|
|
|
+ SDL_SetColorKey(rz_dst, SDL_SRCCOLORKEY | SDL_RLEACCEL, rz_src->format->colorkey);
|
|
|
+ }
|
|
|
+ /*
|
|
|
+ * Unlock source surface
|
|
|
+ */
|
|
|
+ SDL_UnlockSurface(rz_src);
|
|
|
+
|
|
|
+ } else {
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Angle=0: Just a zoom
|
|
|
+ */
|
|
|
+ /*
|
|
|
+ * --------------------
|
|
|
+ */
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Calculate target size
|
|
|
+ */
|
|
|
+ zoomSurfaceSize(rz_src->w, rz_src->h, zoomx, zoomy, &dstwidth, &dstheight);
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Alloc space to completely contain the zoomed surface
|
|
|
+ */
|
|
|
+ rz_dst = NULL;
|
|
|
+ if (is32bit) {
|
|
|
+ /*
|
|
|
+ * Target surface is 32bit with source RGBA/ABGR ordering
|
|
|
+ */
|
|
|
+ rz_dst =
|
|
|
+ SDL_CreateRGBSurface(SDL_SWSURFACE, dstwidth, dstheight, 32,
|
|
|
+ rz_src->format->Rmask, rz_src->format->Gmask,
|
|
|
+ rz_src->format->Bmask, rz_src->format->Amask);
|
|
|
+ } else {
|
|
|
+ /*
|
|
|
+ * Target surface is 8bit
|
|
|
+ */
|
|
|
+ rz_dst = SDL_CreateRGBSurface(SDL_SWSURFACE, dstwidth, dstheight, 8, 0, 0, 0, 0);
|
|
|
+ }
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Lock source surface
|
|
|
+ */
|
|
|
+ SDL_LockSurface(rz_src);
|
|
|
+ /*
|
|
|
+ * Check which kind of surface we have
|
|
|
+ */
|
|
|
+ if (is32bit) {
|
|
|
+ /*
|
|
|
+ * Call the 32bit transformation routine to do the zooming (using alpha)
|
|
|
+ */
|
|
|
+ zoomSurfaceRGBA(rz_src, rz_dst, flipx, flipy, smooth);
|
|
|
+ /*
|
|
|
+ * Turn on source-alpha support
|
|
|
+ */
|
|
|
+ SDL_SetAlpha(rz_dst, SDL_SRCALPHA, 255);
|
|
|
+ } else {
|
|
|
+ /*
|
|
|
+ * Copy palette and colorkey info
|
|
|
+ */
|
|
|
+ for (i = 0; i < rz_src->format->palette->ncolors; i++) {
|
|
|
+ rz_dst->format->palette->colors[i] = rz_src->format->palette->colors[i];
|
|
|
+ }
|
|
|
+ rz_dst->format->palette->ncolors = rz_src->format->palette->ncolors;
|
|
|
+ /*
|
|
|
+ * Call the 8bit transformation routine to do the zooming
|
|
|
+ */
|
|
|
+ zoomSurfaceY(rz_src, rz_dst, flipx, flipy);
|
|
|
+ SDL_SetColorKey(rz_dst, SDL_SRCCOLORKEY | SDL_RLEACCEL, rz_src->format->colorkey);
|
|
|
+ }
|
|
|
+ /*
|
|
|
+ * Unlock source surface
|
|
|
+ */
|
|
|
+ SDL_UnlockSurface(rz_src);
|
|
|
+ }
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Cleanup temp surface
|
|
|
+ */
|
|
|
+ if (src_converted) {
|
|
|
+ SDL_FreeSurface(rz_src);
|
|
|
+ }
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Return destination surface
|
|
|
+ */
|
|
|
+ return (rz_dst);
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+
|
|
|
+ zoomSurface()
|
|
|
+
|
|
|
+ Zoomes a 32bit or 8bit 'src' surface to newly created 'dst' surface.
|
|
|
+ 'zoomx' and 'zoomy' are scaling factors for width and height. If 'smooth' is 1
|
|
|
+ then the destination 32bit surface is anti-aliased. If the surface is not 8bit
|
|
|
+ or 32bit RGBA/ABGR it will be converted into a 32bit RGBA format on the fly.
|
|
|
+
|
|
|
+*/
|
|
|
+
|
|
|
+#define VALUE_LIMIT 0.001
|
|
|
+
|
|
|
+void zoomSurfaceSize(int width, int height, double zoomx, double zoomy, int *dstwidth, int *dstheight)
|
|
|
+{
|
|
|
+ /*
|
|
|
+ * Sanity check zoom factors
|
|
|
+ */
|
|
|
+ if (zoomx < VALUE_LIMIT) {
|
|
|
+ zoomx = VALUE_LIMIT;
|
|
|
+ }
|
|
|
+ if (zoomy < VALUE_LIMIT) {
|
|
|
+ zoomy = VALUE_LIMIT;
|
|
|
+ }
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Calculate target size
|
|
|
+ */
|
|
|
+ *dstwidth = (int) ((double) width * zoomx);
|
|
|
+ *dstheight = (int) ((double) height * zoomy);
|
|
|
+ if (*dstwidth < 1) {
|
|
|
+ *dstwidth = 1;
|
|
|
+ }
|
|
|
+ if (*dstheight < 1) {
|
|
|
+ *dstheight = 1;
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+SDL_Surface *zoomSurface(SDL_Surface * src, double zoomx, double zoomy, int smooth)
|
|
|
+{
|
|
|
+ SDL_Surface *rz_src;
|
|
|
+ SDL_Surface *rz_dst;
|
|
|
+ int dstwidth, dstheight;
|
|
|
+ int is32bit;
|
|
|
+ int i, src_converted;
|
|
|
+ int flipx, flipy;
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Sanity check
|
|
|
+ */
|
|
|
+ if (src == NULL)
|
|
|
+ return (NULL);
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Determine if source surface is 32bit or 8bit
|
|
|
+ */
|
|
|
+ is32bit = (src->format->BitsPerPixel == 32);
|
|
|
+ if ((is32bit) || (src->format->BitsPerPixel == 8)) {
|
|
|
+ /*
|
|
|
+ * Use source surface 'as is'
|
|
|
+ */
|
|
|
+ rz_src = src;
|
|
|
+ src_converted = 0;
|
|
|
+ } else {
|
|
|
+ /*
|
|
|
+ * New source surface is 32bit with a defined RGBA ordering
|
|
|
+ */
|
|
|
+ rz_src =
|
|
|
+ SDL_CreateRGBSurface(SDL_SWSURFACE, src->w, src->h, 32, 0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000);
|
|
|
+ SDL_BlitSurface(src, NULL, rz_src, NULL);
|
|
|
+ src_converted = 1;
|
|
|
+ is32bit = 1;
|
|
|
+ }
|
|
|
+
|
|
|
+ flipx = (zoomx<0);
|
|
|
+ if (flipx) zoomx = -zoomx;
|
|
|
+ flipy = (zoomy<0);
|
|
|
+ if (flipy) zoomy = -zoomy;
|
|
|
+
|
|
|
+ /* Get size if target */
|
|
|
+ zoomSurfaceSize(rz_src->w, rz_src->h, zoomx, zoomy, &dstwidth, &dstheight);
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Alloc space to completely contain the zoomed surface
|
|
|
+ */
|
|
|
+ rz_dst = NULL;
|
|
|
+ if (is32bit) {
|
|
|
+ /*
|
|
|
+ * Target surface is 32bit with source RGBA/ABGR ordering
|
|
|
+ */
|
|
|
+ rz_dst =
|
|
|
+ SDL_CreateRGBSurface(SDL_SWSURFACE, dstwidth, dstheight, 32,
|
|
|
+ rz_src->format->Rmask, rz_src->format->Gmask,
|
|
|
+ rz_src->format->Bmask, rz_src->format->Amask);
|
|
|
+ } else {
|
|
|
+ /*
|
|
|
+ * Target surface is 8bit
|
|
|
+ */
|
|
|
+ rz_dst = SDL_CreateRGBSurface(SDL_SWSURFACE, dstwidth, dstheight, 8, 0, 0, 0, 0);
|
|
|
+ }
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Lock source surface
|
|
|
+ */
|
|
|
+ SDL_LockSurface(rz_src);
|
|
|
+ /*
|
|
|
+ * Check which kind of surface we have
|
|
|
+ */
|
|
|
+ if (is32bit) {
|
|
|
+ /*
|
|
|
+ * Call the 32bit transformation routine to do the zooming (using alpha)
|
|
|
+ */
|
|
|
+ zoomSurfaceRGBA(rz_src, rz_dst, flipx, flipy, smooth);
|
|
|
+ /*
|
|
|
+ * Turn on source-alpha support
|
|
|
+ */
|
|
|
+ SDL_SetAlpha(rz_dst, SDL_SRCALPHA, 255);
|
|
|
+ } else {
|
|
|
+ /*
|
|
|
+ * Copy palette and colorkey info
|
|
|
+ */
|
|
|
+ for (i = 0; i < rz_src->format->palette->ncolors; i++) {
|
|
|
+ rz_dst->format->palette->colors[i] = rz_src->format->palette->colors[i];
|
|
|
+ }
|
|
|
+ rz_dst->format->palette->ncolors = rz_src->format->palette->ncolors;
|
|
|
+ /*
|
|
|
+ * Call the 8bit transformation routine to do the zooming
|
|
|
+ */
|
|
|
+ zoomSurfaceY(rz_src, rz_dst, flipx, flipy);
|
|
|
+ SDL_SetColorKey(rz_dst, SDL_SRCCOLORKEY | SDL_RLEACCEL, rz_src->format->colorkey);
|
|
|
+ }
|
|
|
+ /*
|
|
|
+ * Unlock source surface
|
|
|
+ */
|
|
|
+ SDL_UnlockSurface(rz_src);
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Cleanup temp surface
|
|
|
+ */
|
|
|
+ if (src_converted) {
|
|
|
+ SDL_FreeSurface(rz_src);
|
|
|
+ }
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Return destination surface
|
|
|
+ */
|
|
|
+ return (rz_dst);
|
|
|
+}
|
|
|
+
|
|
|
+SDL_Surface *shrinkSurface(SDL_Surface * src, int factorx, int factory)
|
|
|
+{
|
|
|
+ SDL_Surface *rz_src;
|
|
|
+ SDL_Surface *rz_dst;
|
|
|
+ int dstwidth, dstheight;
|
|
|
+ int is32bit;
|
|
|
+ int i, src_converted;
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Sanity check
|
|
|
+ */
|
|
|
+ if (src == NULL)
|
|
|
+ return (NULL);
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Determine if source surface is 32bit or 8bit
|
|
|
+ */
|
|
|
+ is32bit = (src->format->BitsPerPixel == 32);
|
|
|
+ if ((is32bit) || (src->format->BitsPerPixel == 8)) {
|
|
|
+ /*
|
|
|
+ * Use source surface 'as is'
|
|
|
+ */
|
|
|
+ rz_src = src;
|
|
|
+ src_converted = 0;
|
|
|
+ } else {
|
|
|
+ /*
|
|
|
+ * New source surface is 32bit with a defined RGBA ordering
|
|
|
+ */
|
|
|
+ rz_src =
|
|
|
+ SDL_CreateRGBSurface(SDL_SWSURFACE, src->w, src->h, 32, 0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000);
|
|
|
+ SDL_BlitSurface(src, NULL, rz_src, NULL);
|
|
|
+ src_converted = 1;
|
|
|
+ is32bit = 1;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Get size for target */
|
|
|
+ dstwidth=rz_src->w/factorx;
|
|
|
+ while (dstwidth*factorx>rz_src->w) { dstwidth--; }
|
|
|
+ dstheight=rz_src->h/factory;
|
|
|
+ while (dstheight*factory>rz_src->h) { dstheight--; }
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Alloc space to completely contain the shrunken surface
|
|
|
+ */
|
|
|
+ rz_dst = NULL;
|
|
|
+ if (is32bit) {
|
|
|
+ /*
|
|
|
+ * Target surface is 32bit with source RGBA/ABGR ordering
|
|
|
+ */
|
|
|
+ rz_dst =
|
|
|
+ SDL_CreateRGBSurface(SDL_SWSURFACE, dstwidth, dstheight, 32,
|
|
|
+ rz_src->format->Rmask, rz_src->format->Gmask,
|
|
|
+ rz_src->format->Bmask, rz_src->format->Amask);
|
|
|
+ } else {
|
|
|
+ /*
|
|
|
+ * Target surface is 8bit
|
|
|
+ */
|
|
|
+ rz_dst = SDL_CreateRGBSurface(SDL_SWSURFACE, dstwidth, dstheight, 8, 0, 0, 0, 0);
|
|
|
+ }
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Lock source surface
|
|
|
+ */
|
|
|
+ SDL_LockSurface(rz_src);
|
|
|
+ /*
|
|
|
+ * Check which kind of surface we have
|
|
|
+ */
|
|
|
+ if (is32bit) {
|
|
|
+ /*
|
|
|
+ * Call the 32bit transformation routine to do the shrinking (using alpha)
|
|
|
+ */
|
|
|
+ shrinkSurfaceRGBA(rz_src, rz_dst, factorx, factory);
|
|
|
+ /*
|
|
|
+ * Turn on source-alpha support
|
|
|
+ */
|
|
|
+ SDL_SetAlpha(rz_dst, SDL_SRCALPHA, 255);
|
|
|
+ } else {
|
|
|
+ /*
|
|
|
+ * Copy palette and colorkey info
|
|
|
+ */
|
|
|
+ for (i = 0; i < rz_src->format->palette->ncolors; i++) {
|
|
|
+ rz_dst->format->palette->colors[i] = rz_src->format->palette->colors[i];
|
|
|
+ }
|
|
|
+ rz_dst->format->palette->ncolors = rz_src->format->palette->ncolors;
|
|
|
+ /*
|
|
|
+ * Call the 8bit transformation routine to do the shrinking
|
|
|
+ */
|
|
|
+ shrinkSurfaceY(rz_src, rz_dst, factorx, factory);
|
|
|
+ SDL_SetColorKey(rz_dst, SDL_SRCCOLORKEY | SDL_RLEACCEL, rz_src->format->colorkey);
|
|
|
+ }
|
|
|
+ /*
|
|
|
+ * Unlock source surface
|
|
|
+ */
|
|
|
+ SDL_UnlockSurface(rz_src);
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Cleanup temp surface
|
|
|
+ */
|
|
|
+ if (src_converted) {
|
|
|
+ SDL_FreeSurface(rz_src);
|
|
|
+ }
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Return destination surface
|
|
|
+ */
|
|
|
+ return (rz_dst);
|
|
|
+}
|