[Tux4kids-commits] r628 - in tuxmath/trunk: doc src
tholy-guest at alioth.debian.org
tholy-guest at alioth.debian.org
Fri Aug 15 10:52:48 UTC 2008
Author: tholy-guest
Date: 2008-08-15 10:52:48 +0000 (Fri, 15 Aug 2008)
New Revision: 628
Added:
tuxmath/trunk/src/SDL_rotozoom.c
tuxmath/trunk/src/SDL_rotozoom.h
Modified:
tuxmath/trunk/doc/README.txt
tuxmath/trunk/doc/changelog
tuxmath/trunk/src/CMakeLists.txt
Log:
Add SDL_rotozoom to sources.
Modified: tuxmath/trunk/doc/README.txt
===================================================================
--- tuxmath/trunk/doc/README.txt 2008-08-14 12:57:11 UTC (rev 627)
+++ tuxmath/trunk/doc/README.txt 2008-08-15 10:52:48 UTC (rev 628)
@@ -666,4 +666,6 @@
Subversion
http://subversion.tigris.org/
-
+ SDL_rotozoom was copied from the SDL_gfx library and re-licensed
+ (for the purposes of TuxMath only) to GPL
+ http://www.ferzkopp.net/Software/SDL_gfx-2.0/
Modified: tuxmath/trunk/doc/changelog
===================================================================
--- tuxmath/trunk/doc/changelog 2008-08-14 12:57:11 UTC (rev 627)
+++ tuxmath/trunk/doc/changelog 2008-08-15 10:52:48 UTC (rev 628)
@@ -1,3 +1,11 @@
+2008.Aug.15 (svn.debian.org/tux4kids - revision 627)
+ Added SDL_rotozoom to the sources, from the SDL_gfx library.
+
+ Also note: most of the summer of code contributions have been
+ added, but this is not well-reflected in the changelog.
+
+ Tim Holy
+
2008.June.19 (svn.debian.org/tux4kids - revision 537)
Code:
Tweaked menu locations for larger screens and fixed a number of
Modified: tuxmath/trunk/src/CMakeLists.txt
===================================================================
--- tuxmath/trunk/src/CMakeLists.txt 2008-08-14 12:57:11 UTC (rev 627)
+++ tuxmath/trunk/src/CMakeLists.txt 2008-08-15 10:52:48 UTC (rev 628)
@@ -8,10 +8,12 @@
find_package(SDL_mixer REQUIRED)
find_package(SDL_gfx)
-if (NOT ${SLDGFX_FOUND})
+#message("SDLGFX_FOUND ${SDLGFX_FOUND}")
+
+if (NOT SLDGFX_FOUND)
message("Adding rotozoom")
set(TUXMATH_EXTRA_SRC ${TUXMATH_EXTRA_SRC} SDL_rotozoom.c)
-endif (NOT ${SLDGFX_FOUND})
+endif (NOT SLDGFX_FOUND)
## Define the source files used for each executable
Added: tuxmath/trunk/src/SDL_rotozoom.c
===================================================================
--- tuxmath/trunk/src/SDL_rotozoom.c (rev 0)
+++ tuxmath/trunk/src/SDL_rotozoom.c 2008-08-15 10:52:48 UTC (rev 628)
@@ -0,0 +1,1355 @@
+/*
+
+ The SDL_rotozoom sources were copied from the SDL_gfx library and
+ are relicensed, only for the purposes of TuxMath, to GPL. Thanks to
+ Andreas Schiffler.
+
+ SDL_rotozoom.c - rotozoomer for 32bit or 8bit surfaces
+
+ LGPL (c) A. Schiffler
+
+*/
+
+#ifdef WIN32
+#include <windows.h>
+#endif
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "SDL_rotozoom.h"
+
+#define MAX(a,b) (((a) > (b)) ? (a) : (b))
+
+
+/*
+
+ 32bit integer-factor averaging Shrinker
+
+ Shrinks 32bit RGBA/ABGR 'src' surface to 'dst' surface.
+
+*/
+
+int shrinkSurfaceRGBA(SDL_Surface * src, SDL_Surface * dst, int factorx, int factory)
+{
+ int x, y, dx, dy, sgap, dgap, ra, ga, ba, aa;
+ int n_average;
+ tColorRGBA *sp, *osp, *oosp;
+ tColorRGBA *dp;
+
+ /*
+ * Averaging integer shrink
+ */
+
+ /* Precalculate division factor */
+ n_average = factorx*factory;
+
+ /*
+ * Scan destination
+ */
+ sp = (tColorRGBA *) src->pixels;
+ sgap = src->pitch - src->w * 4;
+
+ dp = (tColorRGBA *) dst->pixels;
+ dgap = dst->pitch - dst->w * 4;
+
+ for (y = 0; y < dst->h; y++) {
+
+ osp=sp;
+ for (x = 0; x < dst->w; x++) {
+
+ /* Trace out source box and accumulate */
+ oosp=sp;
+ ra=ga=ba=aa=0;
+ for (dy=0; dy < factory; dy++) {
+ for (dx=0; dx < factorx; dx++) {
+ ra += sp->r;
+ ga += sp->g;
+ ba += sp->b;
+ aa += sp->a;
+
+ sp++;
+ } // src dx loop
+ sp = (tColorRGBA *)((Uint8*)sp + (src->pitch - 4*factorx)); // next y
+ } // src dy loop
+
+ // next box-x
+ sp = (tColorRGBA *)((Uint8*)oosp + 4*factorx);
+
+ /* Store result in destination */
+ dp->r = ra/n_average;
+ dp->g = ga/n_average;
+ dp->b = ba/n_average;
+ dp->a = aa/n_average;
+
+ /*
+ * Advance destination pointer
+ */
+ dp++;
+ } // dst x loop
+
+ // next box-y
+ sp = (tColorRGBA *)((Uint8*)osp + src->pitch*factory);
+
+ /*
+ * Advance destination pointers
+ */
+ dp = (tColorRGBA *) ((Uint8 *) dp + dgap);
+ } // dst y loop
+
+ return (0);
+}
+
+/*
+
+ 8bit integer-factor averaging Shrinker
+
+ Shrinks 8bit Y 'src' surface to 'dst' surface.
+
+*/
+
+int shrinkSurfaceY(SDL_Surface * src, SDL_Surface * dst, int factorx, int factory)
+{
+ int x, y, dx, dy, sgap, dgap, a;
+ int n_average;
+ Uint8 *sp, *osp, *oosp;
+ Uint8 *dp;
+
+ /*
+ * Averaging integer shrink
+ */
+
+ /* Precalculate division factor */
+ n_average = factorx*factory;
+
+ /*
+ * Scan destination
+ */
+ sp = (Uint8 *) src->pixels;
+ sgap = src->pitch - src->w;
+
+ dp = (Uint8 *) dst->pixels;
+ dgap = dst->pitch - dst->w;
+
+ for (y = 0; y < dst->h; y++) {
+
+ osp=sp;
+ for (x = 0; x < dst->w; x++) {
+
+ /* Trace out source box and accumulate */
+ oosp=sp;
+ a=0;
+ for (dy=0; dy < factory; dy++) {
+ for (dx=0; dx < factorx; dx++) {
+ a += (*sp);
+ sp++; // next x
+ } // src dx loop
+ sp = (Uint8 *)((Uint8*)sp + (src->pitch - factorx)); // next y
+ } // src dy loop
+
+ // next box-x
+ sp = (Uint8 *)((Uint8*)oosp + factorx);
+
+ /* Store result in destination */
+ *dp = a/n_average;
+
+ /*
+ * Advance destination pointer
+ */
+ dp++;
+ } // dst x loop
+
+ // next box-y
+ sp = (Uint8 *)((Uint8*)osp + src->pitch*factory);
+
+ /*
+ * Advance destination pointers
+ */
+ dp = (Uint8 *)((Uint8 *)dp + dgap);
+ } // dst y loop
+
+ return (0);
+}
+
+/*
+
+ 32bit Zoomer with optional anti-aliasing by bilinear interpolation.
+
+ Zoomes 32bit RGBA/ABGR 'src' surface to 'dst' surface.
+
+*/
+
+int zoomSurfaceRGBA(SDL_Surface * src, SDL_Surface * dst, int flipx, int flipy, int smooth)
+{
+ int x, y, sx, sy, *sax, *say, *csax, *csay, csx, csy, ex, ey, t1, t2, sstep;
+ tColorRGBA *c00, *c01, *c10, *c11;
+ tColorRGBA *sp, *csp, *dp;
+ int dgap;
+
+ /*
+ * Variable setup
+ */
+ if (smooth) {
+ /*
+ * For interpolation: assume source dimension is one pixel
+ */
+ /*
+ * smaller to avoid overflow on right and bottom edge.
+ */
+ sx = (int) (65536.0 * (float) (src->w - 1) / (float) dst->w);
+ sy = (int) (65536.0 * (float) (src->h - 1) / (float) dst->h);
+ } else {
+ sx = (int) (65536.0 * (float) src->w / (float) dst->w);
+ sy = (int) (65536.0 * (float) src->h / (float) dst->h);
+ }
+
+ /*
+ * Allocate memory for row increments
+ */
+ if ((sax = (int *) malloc((dst->w + 1) * sizeof(Uint32))) == NULL) {
+ return (-1);
+ }
+ if ((say = (int *) malloc((dst->h + 1) * sizeof(Uint32))) == NULL) {
+ free(sax);
+ return (-1);
+ }
+
+ /*
+ * Precalculate row increments
+ */
+ sp = csp = (tColorRGBA *) src->pixels;
+ dp = (tColorRGBA *) dst->pixels;
+
+ if (flipx) csp += (src->w-1);
+ if (flipy) csp = (tColorRGBA*)( (Uint8*)csp + src->pitch*(src->h-1) );
+
+ csx = 0;
+ csax = sax;
+ for (x = 0; x <= dst->w; x++) {
+ *csax = csx;
+ csax++;
+ csx &= 0xffff;
+ csx += sx;
+ }
+ csy = 0;
+ csay = say;
+ for (y = 0; y <= dst->h; y++) {
+ *csay = csy;
+ csay++;
+ csy &= 0xffff;
+ csy += sy;
+ }
+
+ dgap = dst->pitch - dst->w * 4;
+
+ /*
+ * Switch between interpolating and non-interpolating code
+ */
+ if (smooth) {
+
+ /*
+ * Interpolating Zoom
+ */
+
+ /*
+ * Scan destination
+ */
+ csay = say;
+ for (y = 0; y < dst->h; y++) {
+ /*
+ * Setup color source pointers
+ */
+ c00 = csp;
+ c01 = csp;
+ c01++;
+ c10 = (tColorRGBA *) ((Uint8 *) csp + src->pitch);
+ c11 = c10;
+ c11++;
+ csax = sax;
+ for (x = 0; x < dst->w; x++) {
+
+ /*
+ * Interpolate colors
+ */
+ ex = (*csax & 0xffff);
+ ey = (*csay & 0xffff);
+ t1 = ((((c01->r - c00->r) * ex) >> 16) + c00->r) & 0xff;
+ t2 = ((((c11->r - c10->r) * ex) >> 16) + c10->r) & 0xff;
+ dp->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;
+ dp->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;
+ dp->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;
+ dp->a = (((t2 - t1) * ey) >> 16) + t1;
+
+ /*
+ * Advance source pointers
+ */
+ csax++;
+ sstep = (*csax >> 16);
+ c00 += sstep;
+ c01 += sstep;
+ c10 += sstep;
+ c11 += sstep;
+ /*
+ * Advance destination pointer
+ */
+ dp++;
+ }
+ /*
+ * Advance source pointer
+ */
+ csay++;
+ csp = (tColorRGBA *) ((Uint8 *) csp + (*csay >> 16) * src->pitch);
+ /*
+ * Advance destination pointers
+ */
+ dp = (tColorRGBA *) ((Uint8 *) dp + dgap);
+ }
+
+ } else {
+
+ /*
+ * Non-Interpolating Zoom
+ */
+
+ csay = say;
+ for (y = 0; y < dst->h; y++) {
+ sp = csp;
+ csax = sax;
+ for (x = 0; x < dst->w; x++) {
+ /*
+ * Draw
+ */
+ *dp = *sp;
+ /*
+ * Advance source pointers
+ */
+ csax++;
+ sstep = (*csax >> 16);
+ if (flipx) sstep = -sstep;
+ sp += sstep;
+ /*
+ * Advance destination pointer
+ */
+ dp++;
+ }
+ /*
+ * Advance source pointer
+ */
+ csay++;
+ sstep = (*csay >> 16) * src->pitch;
+ if (flipy) sstep = -sstep;
+ csp = (tColorRGBA *) ((Uint8 *) csp + sstep);
+
+ /*
+ * Advance destination pointers
+ */
+ dp = (tColorRGBA *) ((Uint8 *) dp + dgap);
+ }
+
+ }
+
+ /*
+ * Remove temp arrays
+ */
+ free(sax);
+ free(say);
+
+ return (0);
+}
+
+/*
+
+ 8bit Zoomer without smoothing.
+
+ Zoomes 8bit palette/Y 'src' surface to 'dst' surface.
+
+*/
+
+int zoomSurfaceY(SDL_Surface * src, SDL_Surface * dst, int flipx, int flipy)
+{
+ Uint32 x, y, sx, sy, *sax, *say, *csax, *csay, csx, csy;
+ Uint8 *sp, *dp, *csp;
+ int dgap;
+
+ /*
+ * Variable setup
+ */
+ sx = (Uint32) (65536.0 * (float) src->w / (float) dst->w);
+ sy = (Uint32) (65536.0 * (float) src->h / (float) dst->h);
+
+ /*
+ * Allocate memory for row increments
+ */
+ if ((sax = (Uint32 *) malloc(dst->w * sizeof(Uint32))) == NULL) {
+ return (-1);
+ }
+ if ((say = (Uint32 *) malloc(dst->h * sizeof(Uint32))) == NULL) {
+ if (sax != NULL) {
+ free(sax);
+ }
+ return (-1);
+ }
+
+ /*
+ * Precalculate row increments
+ */
+ csx = 0;
+ csax = sax;
+ for (x = 0; x < dst->w; x++) {
+ csx += sx;
+ *csax = (csx >> 16);
+ csx &= 0xffff;
+ csax++;
+ }
+ csy = 0;
+ csay = say;
+ for (y = 0; y < dst->h; y++) {
+ csy += sy;
+ *csay = (csy >> 16);
+ csy &= 0xffff;
+ csay++;
+ }
+
+ csx = 0;
+ csax = sax;
+ for (x = 0; x < dst->w; x++) {
+ csx += (*csax);
+ csax++;
+ }
+ csy = 0;
+ csay = say;
+ for (y = 0; y < dst->h; y++) {
+ csy += (*csay);
+ csay++;
+ }
+
+ /*
+ * Pointer setup
+ */
+ sp = csp = (Uint8 *) src->pixels;
+ dp = (Uint8 *) dst->pixels;
+ dgap = dst->pitch - dst->w;
+
+ /*
+ * Draw
+ */
+ csay = say;
+ for (y = 0; y < dst->h; y++) {
+ csax = sax;
+ sp = csp;
+ for (x = 0; x < dst->w; x++) {
+ /*
+ * 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 = 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 = 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;
+ }
+}
+
+
+/*
+
+ 32bit specialized 90degree rotator
+
+ Rotates and zooms 'src' surface to 'dst' surface in 90degree increments.
+
+ (contributed by Jeff Schiller)
+
+*/
+SDL_Surface* rotateSurface90Degrees(SDL_Surface* pSurf, int numClockwiseTurns)
+{
+ int row, col;
+
+ // Has to be a valid surface pointer and only 32-bit surfaces (for now)
+ if (!pSurf || pSurf->format->BitsPerPixel != 32) { return NULL; }
+
+ // normalize numClockwiseTurns
+ while(numClockwiseTurns < 0) { numClockwiseTurns += 4; }
+ numClockwiseTurns = (numClockwiseTurns % 4);
+
+ // if it's even, our new width will be the same as the source surface
+ int newWidth = (numClockwiseTurns % 2) ? (pSurf->h) : (pSurf->w);
+ int newHeight = (numClockwiseTurns % 2) ? (pSurf->w) : (pSurf->h);
+ SDL_Surface* pSurfOut = SDL_CreateRGBSurface( pSurf->flags, newWidth, newHeight, pSurf->format->BitsPerPixel,
+ pSurf->format->Rmask,
+ pSurf->format->Gmask,
+ pSurf->format->Bmask,
+ pSurf->format->Amask);
+ if(!pSurfOut) {
+ return NULL;
+ }
+
+ if(numClockwiseTurns != 0) {
+ SDL_LockSurface(pSurf);
+ SDL_LockSurface(pSurfOut);
+ switch(numClockwiseTurns) {
+ // rotate clockwise
+ case 1: // rotated 90 degrees clockwise
+ {
+ Uint32* srcBuf = NULL;
+ Uint32* dstBuf = NULL;
+
+ for (row = 0; row < pSurf->h; ++row) {
+ srcBuf = (Uint32*)(pSurf->pixels) + (row*pSurf->pitch/4);
+ dstBuf = (Uint32*)(pSurfOut->pixels) + (pSurfOut->w - row - 1);
+ for (col = 0; col < pSurf->w; ++col) {
+ *dstBuf = *srcBuf;
+ ++srcBuf;
+ dstBuf += pSurfOut->pitch/4;
+ } // for(col)
+ } // for(row)
+ }
+ break;
+
+ case 2: // rotated 180 degrees clockwise
+ {
+ Uint32* srcBuf = NULL;
+ Uint32* dstBuf = NULL;
+
+ for(row = 0; row < pSurf->h; ++row) {
+ srcBuf = (Uint32*)(pSurf->pixels) + (row*pSurf->pitch/4);
+ dstBuf = (Uint32*)(pSurfOut->pixels) + ((pSurfOut->h - row - 1)*pSurfOut->pitch/4) + (pSurfOut->w - 1);
+ for(col = 0; col < pSurf->w; ++col) {
+ *dstBuf = *srcBuf;
+ ++srcBuf;
+ --dstBuf;
+ } // for(col)
+ } // for(row)
+ }
+ break;
+
+ case 3:
+ {
+ Uint32* srcBuf = NULL;
+ Uint32* dstBuf = NULL;
+
+ for(row = 0; row < pSurf->h; ++row) {
+ srcBuf = (Uint32*)(pSurf->pixels) + (row*pSurf->pitch/4);
+ dstBuf = (Uint32*)(pSurfOut->pixels) + row + ((pSurfOut->h - 1)*pSurfOut->pitch/4);
+ for(col = 0; col < pSurf->w; ++col) {
+ *dstBuf = *srcBuf;
+ ++srcBuf;
+ dstBuf -= pSurfOut->pitch/4;
+ } // for(col)
+ } // for(row)
+ }
+ break;
+ } // switch
+
+ SDL_UnlockSurface(pSurf);
+ SDL_UnlockSurface(pSurfOut);
+ } // if numClockwiseTurns > 0
+ else {
+ // simply copy surface to output
+ if(SDL_BlitSurface(pSurf, NULL, pSurfOut, NULL)) {
+ return NULL;
+ }
+ }
+ return pSurfOut;
+}
+
+/*
+
+ 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,
+#if SDL_BYTEORDER == SDL_LIL_ENDIAN
+ 0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000
+#else
+ 0xff000000, 0x00ff0000, 0x0000ff00, 0x000000ff
+#endif
+ );
+ 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,
+#if SDL_BYTEORDER == SDL_LIL_ENDIAN
+ 0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000
+#else
+ 0xff000000, 0x00ff0000, 0x0000ff00, 0x000000ff
+#endif
+ );
+ 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,
+#if SDL_BYTEORDER == SDL_LIL_ENDIAN
+ 0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000
+#else
+ 0xff000000, 0x00ff0000, 0x0000ff00, 0x000000ff
+#endif
+ );
+ 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);
+}
Added: tuxmath/trunk/src/SDL_rotozoom.h
===================================================================
--- tuxmath/trunk/src/SDL_rotozoom.h (rev 0)
+++ tuxmath/trunk/src/SDL_rotozoom.h 2008-08-15 10:52:48 UTC (rev 628)
@@ -0,0 +1,129 @@
+
+/*
+
+ The SDL_rotozoom sources were copied from the SDL_gfx library and
+ are relicensed, only for the purposes of TuxMath, to GPL. Thanks to
+ Andreas Schiffler.
+
+ SDL_rotozoom - rotozoomer
+
+ LGPL (c) A. Schiffler
+
+*/
+
+#ifndef _SDL_rotozoom_h
+#define _SDL_rotozoom_h
+
+#include <math.h>
+
+/* Set up for C function definitions, even when using C++ */
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef M_PI
+#define M_PI 3.141592654
+#endif
+
+#include "SDL.h"
+
+/* ---- Defines */
+
+#define SMOOTHING_OFF 0
+#define SMOOTHING_ON 1
+
+/* ---- Structures */
+
+ typedef struct tColorRGBA {
+ Uint8 r;
+ Uint8 g;
+ Uint8 b;
+ Uint8 a;
+ } tColorRGBA;
+
+ typedef struct tColorY {
+ Uint8 y;
+ } tColorY;
+
+
+/* ---- Prototypes */
+
+#ifdef WIN32
+#ifdef BUILD_DLL
+#define DLLINTERFACE __declspec(dllexport)
+#else
+#define DLLINTERFACE __declspec(dllimport)
+#endif
+#else
+#define DLLINTERFACE
+#endif
+
+/*
+
+ 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.
+
+*/
+
+ DLLINTERFACE SDL_Surface *rotozoomSurface(SDL_Surface * src, double angle, double zoom, int smooth);
+
+ DLLINTERFACE SDL_Surface *rotozoomSurfaceXY
+ (SDL_Surface * src, double angle, double zoomx, double zoomy, int smooth);
+
+/* Returns the size of the target surface for a rotozoomSurface() call */
+
+ DLLINTERFACE void rotozoomSurfaceSize(int width, int height, double angle, double zoom, int *dstwidth,
+ int *dstheight);
+
+ DLLINTERFACE void rotozoomSurfaceSizeXY
+ (int width, int height, double angle, double zoomx, double zoomy,
+ int *dstwidth, int *dstheight);
+
+/*
+
+ 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.
+
+*/
+
+ DLLINTERFACE SDL_Surface *zoomSurface(SDL_Surface * src, double zoomx, double zoomy, int smooth);
+
+/* Returns the size of the target surface for a zoomSurface() call */
+
+ DLLINTERFACE void zoomSurfaceSize(int width, int height, double zoomx, double zoomy, int *dstwidth, int *dstheight);
+
+
+/*
+ shrinkSurface()
+
+ Shrinks a 32bit or 8bit 'src' surface ti a newly created 'dst' surface.
+ 'factorx' and 'factory' are the shrinking ratios (i.e. 2=1/2 the size,
+ 3=1/3 the size, etc.) The destination surface is antialiased by averaging
+ the source box RGBA or Y information. If the surface is not 8bit
+ or 32bit RGBA/ABGR it will be converted into a 32bit RGBA format on the fly.
+*/
+
+ DLLINTERFACE SDL_Surface *shrinkSurface(SDL_Surface * src, int factorx, int factory);
+
+/*
+
+ Other functions
+
+*/
+
+ DLLINTERFACE SDL_Surface* rotateSurface90Degrees(SDL_Surface* pSurf, int numClockwiseTurns);
+
+/* Ends C function definitions when using C++ */
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _SDL_rotozoom_h */
More information about the Tux4kids-commits
mailing list