Faster blit when using No Alpha or Set Alpha, + ColorKey
Applied to following formats:
ABGR8888 -> BGRX8888 : faster x4 (2794295 -> 610587)
ABGR8888 -> RGB888 : faster x4 (2835693 -> 615561)
ABGR8888 -> RGBX8888 : faster x4 (2880475 -> 610479)
ARGB8888 -> BGR888 : faster x4 (2802718 -> 610702)
ARGB8888 -> BGRX8888 : faster x4 (2792481 -> 606311)
ARGB8888 -> RGBX8888 : faster x4 (2821621 -> 624745)
BGR888 -> ARGB8888 : faster x4 (2791705 -> 637889)
BGR888 -> BGRA8888 : faster x4 (2793195 -> 652299)
BGR888 -> BGRX8888 : faster x4 (2800713 -> 609326)
BGR888 -> RGB888 : faster x4 (2812260 -> 610471)
BGR888 -> RGBA8888 : faster x4 (2792327 -> 629288)
BGR888 -> RGBX8888 : faster x4 (2799224 -> 607073)
BGRA8888 -> BGR888 : faster x4 (2800520 -> 606897)
BGRA8888 -> RGB888 : faster x4 (2825274 -> 616156)
BGRA8888 -> RGBX8888 : faster x4 (2812530 -> 610340)
BGRX8888 -> ABGR8888 : faster x4 (2793940 -> 628596)
BGRX8888 -> ARGB8888 : faster x4 (2822686 -> 638899)
BGRX8888 -> BGR888 : faster x4 (2818141 -> 613659)
BGRX8888 -> RGB888 : faster x4 (2929017 -> 611794)
BGRX8888 -> RGBA8888 : faster x4 (2799709 -> 629750)
BGRX8888 -> RGBX8888 : faster x4 (2911010 -> 605640)
RGB888 -> ABGR8888 : faster x4 (2800671 -> 631542)
RGB888 -> BGR888 : faster x4 (2802644 -> 604461)
RGB888 -> BGRA8888 : faster x4 (2801919 -> 628729)
RGB888 -> BGRX8888 : faster x4 (2938244 -> 604135)
RGB888 -> RGBA8888 : faster x4 (2912447 -> 642185)
RGB888 -> RGBX8888 : faster x4 (2831676 -> 634293)
RGBA8888 -> BGR888 : faster x4 (2928896 -> 614960)
RGBA8888 -> BGRX8888 : faster x4 (2821422 -> 608146)
RGBA8888 -> RGB888 : faster x4 (2825927 -> 617184)
RGBX8888 -> ABGR8888 : faster x4 (2803852 -> 654129)
RGBX8888 -> ARGB8888 : faster x4 (2923615 -> 642644)
RGBX8888 -> BGR888 : faster x4 (2806523 -> 610447)
RGBX8888 -> BGRA8888 : faster x4 (2813388 -> 630305)
RGBX8888 -> BGRX8888 : faster x4 (2800052 -> 607881)
RGBX8888 -> RGB888 : faster x4 (2807722 -> 610263)
diff --git a/src/video/SDL_blit_N.c b/src/video/SDL_blit_N.c
index 2067dfb..0886bed 100644
--- a/src/video/SDL_blit_N.c
+++ b/src/video/SDL_blit_N.c
@@ -2379,6 +2379,123 @@
}
}
+ /* Any src/dst 8888, not CopyAlpha, no ARGB2101010 */
+ if (srcbpp == 4 && dstbpp == 4 &&
+ srcfmt->format != SDL_PIXELFORMAT_ARGB2101010 &&
+ dstfmt->format != SDL_PIXELFORMAT_ARGB2101010) {
+
+ Uint32 *src32 = (Uint32*)src;
+ Uint32 *dst32 = (Uint32*)dst;
+
+ if (dstfmt->Amask) {
+ /* Find the appropriate permutation */
+ int missing = 0, r, g, b, a;
+ int Pixel = 0x03020100;
+ RGB_FROM_PIXEL(Pixel, srcfmt, r, g, b);
+ PIXEL_FROM_RGBA(Pixel, dstfmt, r, g, b, 255);
+ r = Pixel & 0xFF;
+ g = (Pixel >> 8) & 0xFF;
+ b = (Pixel >> 16) & 0xFF;
+ a = (Pixel >> 24) & 0xFF;
+
+ {
+ int val;
+ for (val = 0; val <= 3; val++) {
+ if (r != val && g != val && b != val && a != val) {
+ missing = val;
+ }
+ }
+ }
+
+ if (r == 255) {
+ r = missing;
+ missing = 0;
+ } else if (g == 255) {
+ g = missing;
+ missing = 1;
+ } else if (b == 255) {
+ b = missing;
+ missing = 2;
+ } else if (a == 255) {
+ a = missing;
+ missing = 3;
+ }
+
+ while (height--) {
+ /* *INDENT-OFF* */
+ DUFFS_LOOP(
+ {
+ if ((*src32 & rgbmask) != ckey) {
+ Uint8 *s8 = (Uint8 *)src32;
+ Uint8 *d8 = (Uint8 *)dst32;
+ d8[0] = s8[r];
+ d8[1] = s8[g];
+ d8[2] = s8[b];
+ d8[3] = s8[a];
+ d8[missing] = alpha;
+ }
+ ++src32;
+ ++dst32;
+ }, width);
+ /* *INDENT-ON* */
+ src32 = (Uint32 *)((Uint8 *)src32 + srcskip);
+ dst32 = (Uint32 *)((Uint8 *)dst32 + dstskip);
+ }
+
+ return;
+ } else {
+ /* Find the appropriate permutation */
+ int missing = 0, r, g, b, a;
+ int Pixel = 0x04030201; /* +1 */
+ RGBA_FROM_PIXEL(Pixel, srcfmt, r, g, b, a);
+ missing = a;
+ PIXEL_FROM_RGB(Pixel, dstfmt, r, g, b);
+ r = Pixel & 0xFF;
+ g = (Pixel >> 8) & 0xFF;
+ b = (Pixel >> 16) & 0xFF;
+ a = (Pixel >> 24) & 0xFF;
+
+ if (r == 0) {
+ r = missing;
+ missing = 0;
+ } else if (g == 0) {
+ g = missing;
+ missing = 1;
+ } else if (b == 0) {
+ b = missing;
+ missing = 2;
+ } else if (a == 0) {
+ a = missing;
+ missing = 3;
+ }
+
+ /* -1 */
+ r -= 1; g -= 1; b -= 1; a -= 1;
+
+ while (height--) {
+ /* *INDENT-OFF* */
+ DUFFS_LOOP(
+ {
+ if ((*src32 & rgbmask) != ckey) {
+ Uint8 *s8 = (Uint8 *)src32;
+ Uint8 *d8 = (Uint8 *)dst32;
+ d8[0] = s8[r];
+ d8[1] = s8[g];
+ d8[2] = s8[b];
+ d8[3] = s8[a];
+ d8[missing] = 0;
+ }
+ ++src32;
+ ++dst32;
+ }, width);
+ /* *INDENT-ON* */
+ src32 = (Uint32 *)((Uint8 *)src32 + srcskip);
+ dst32 = (Uint32 *)((Uint8 *)dst32 + dstskip);
+ }
+ return;
+ }
+ }
+
/* BPP 3, same rgb triplet */
if ((sfmt == SDL_PIXELFORMAT_RGB24 && dfmt == SDL_PIXELFORMAT_RGB24) ||
(sfmt == SDL_PIXELFORMAT_BGR24 && dfmt == SDL_PIXELFORMAT_BGR24)) {
