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https://github.com/Relintai/sdl2_frt.git
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Code factorization of the pixel format permutation
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@ -2149,6 +2149,71 @@ Blit4to4CopyAlpha(SDL_BlitInfo * info)
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/* permutation for mapping srcfmt to dstfmt, overloading or not the alpha channel */
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static void
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get_permutation(SDL_PixelFormat *srcfmt, SDL_PixelFormat *dstfmt,
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int *_r , int *_g, int *_b, int *_a, int *_missing)
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{
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int missing = 0, r, g, b, a = 0;
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int Pixel = 0x04030201; /* identity permutation */
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if (srcfmt->Amask) {
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RGBA_FROM_PIXEL(Pixel, srcfmt, r, g, b, a);
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} else {
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RGB_FROM_PIXEL(Pixel, srcfmt, r, g, b);
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}
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if (dstfmt->Amask) {
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if (srcfmt->Amask) {
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PIXEL_FROM_RGBA(Pixel, dstfmt, r, g, b, a);
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} else {
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PIXEL_FROM_RGBA(Pixel, dstfmt, r, g, b, 0);
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}
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} else {
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PIXEL_FROM_RGB(Pixel, dstfmt, r, g, b);
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}
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r = Pixel & 0xFF;
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g = (Pixel >> 8) & 0xFF;
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b = (Pixel >> 16) & 0xFF;
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a = (Pixel >> 24) & 0xFF;
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{
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int val;
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for (val = 0; val <= 3; val++) {
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if (r != val && g != val && b != val && a != val) {
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missing = val;
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break;
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}
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}
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}
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if (r == 0) {
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r = missing;
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missing = 0;
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} else if (g == 0) {
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g = missing;
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missing = 1;
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} else if (b == 0) {
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b = missing;
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missing = 2;
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} else if (a == 0) {
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a = missing;
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missing = 3;
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}
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*_r = r - 1;
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*_g = g - 1;
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*_b = b - 1;
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*_a = a - 1;
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if (missing) {
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*_missing = missing;
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}
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return;
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}
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static void
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BlitNtoN(SDL_BlitInfo * info)
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{
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@ -2174,45 +2239,8 @@ BlitNtoN(SDL_BlitInfo * info)
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/* Find the appropriate permutation */
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int missing = 0, r, g, b, a;
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int Pixel = 0x04030201; /* +1 */
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RGB_FROM_PIXEL(Pixel, srcfmt, r, g, b);
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if (dstfmt->Amask) {
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PIXEL_FROM_RGBA(Pixel, dstfmt, r, g, b, 0);
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} else {
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PIXEL_FROM_RGB(Pixel, dstfmt, r, g, b);
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}
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r = Pixel & 0xFF;
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g = (Pixel >> 8) & 0xFF;
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b = (Pixel >> 16) & 0xFF;
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a = (Pixel >> 24) & 0xFF;
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{
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int val;
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for (val = 0; val <= 3; val++) {
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if (r != val && g != val && b != val && a != val) {
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missing = val;
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}
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}
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}
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if (r == 0) {
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r = missing;
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missing = 0;
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} else if (g == 0) {
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g = missing;
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missing = 1;
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} else if (b == 0) {
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b = missing;
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missing = 2;
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} else if (a == 0) {
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a = missing;
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missing = 3;
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}
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/* -1 */
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r -= 1; g -= 1; b -= 1; a -= 1;
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get_permutation(srcfmt, dstfmt, &r, &g, &b, &a, &missing);
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while (height--) {
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/* *INDENT-OFF* */
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DUFFS_LOOP(
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@ -2456,41 +2484,12 @@ BlitNtoNKey(SDL_BlitInfo * info)
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Uint32 *src32 = (Uint32*)src;
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Uint32 *dst32 = (Uint32*)dst;
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/* Find the appropriate permutation */
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int missing = 0, r, g, b, a;
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get_permutation(srcfmt, dstfmt, &r, &g, &b, &a, &missing);
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if (dstfmt->Amask) {
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/* Find the appropriate permutation */
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int missing = 0, r, g, b, a;
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int Pixel = 0x03020100;
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RGB_FROM_PIXEL(Pixel, srcfmt, r, g, b);
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PIXEL_FROM_RGBA(Pixel, dstfmt, r, g, b, 255);
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r = Pixel & 0xFF;
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g = (Pixel >> 8) & 0xFF;
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b = (Pixel >> 16) & 0xFF;
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a = (Pixel >> 24) & 0xFF;
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{
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int val;
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for (val = 0; val <= 3; val++) {
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if (r != val && g != val && b != val && a != val) {
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missing = val;
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}
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}
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}
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if (r == 255) {
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r = missing;
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missing = 0;
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} else if (g == 255) {
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g = missing;
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missing = 1;
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} else if (b == 255) {
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b = missing;
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missing = 2;
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} else if (a == 255) {
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a = missing;
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missing = 3;
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}
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while (height--) {
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/* *INDENT-OFF* */
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DUFFS_LOOP(
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@ -2514,34 +2513,6 @@ BlitNtoNKey(SDL_BlitInfo * info)
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return;
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} else {
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/* Find the appropriate permutation */
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int missing = 0, r, g, b, a;
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int Pixel = 0x04030201; /* +1 */
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RGBA_FROM_PIXEL(Pixel, srcfmt, r, g, b, a);
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missing = a;
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PIXEL_FROM_RGB(Pixel, dstfmt, r, g, b);
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r = Pixel & 0xFF;
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g = (Pixel >> 8) & 0xFF;
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b = (Pixel >> 16) & 0xFF;
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a = (Pixel >> 24) & 0xFF;
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if (r == 0) {
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r = missing;
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missing = 0;
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} else if (g == 0) {
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g = missing;
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missing = 1;
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} else if (b == 0) {
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b = missing;
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missing = 2;
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} else if (a == 0) {
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a = missing;
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missing = 3;
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}
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/* -1 */
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r -= 1; g -= 1; b -= 1; a -= 1;
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while (height--) {
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/* *INDENT-OFF* */
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DUFFS_LOOP(
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@ -2716,13 +2687,7 @@ BlitNtoNKeyCopyAlpha(SDL_BlitInfo * info)
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/* Find the appropriate permutation */
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int r, g, b, a;
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Pixel = 0x03020100;
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RGBA_FROM_PIXEL(Pixel, srcfmt, r, g, b, a);
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PIXEL_FROM_RGBA(Pixel, dstfmt, r, g, b, a);
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r = Pixel & 0xFF;
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g = (Pixel >> 8) & 0xFF;
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b = (Pixel >> 16) & 0xFF;
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a = (Pixel >> 24) & 0xFF;
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get_permutation(srcfmt, dstfmt, &r, &g, &b, &a, NULL);
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while (height--) {
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/* *INDENT-OFF* */
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