Faster blit with no ColorKey
Applied to following formats:
ABGR8888 -> BGRX8888 : faster x5 (3177493 -> 630439)
ABGR8888 -> RGBX8888 : faster x5 (3178104 -> 628925)
ARGB8888 -> BGRX8888 : faster x4 (3141089 -> 629448)
ARGB8888 -> RGBX8888 : faster x5 (3216413 -> 630465)
BGR888 -> BGRA8888 : faster x4 (3145403 -> 637701)
BGR888 -> BGRX8888 : faster x4 (3142106 -> 630144)
BGR888 -> RGBA8888 : faster x4 (3202685 -> 649384)
BGR888 -> RGBX8888 : faster x4 (3170617 -> 658670)
BGRA8888 -> BGR888 : faster x4 (3203308 -> 657697)
BGRA8888 -> RGB888 : faster x5 (3201475 -> 631747)
BGRA8888 -> RGBX8888 : faster x5 (3274544 -> 630409)
BGRX8888 -> ABGR8888 : faster x4 (3149753 -> 638682)
BGRX8888 -> ARGB8888 : faster x5 (3164101 -> 631273)
BGRX8888 -> BGR888 : faster x4 (3144454 -> 630712)
BGRX8888 -> RGB888 : faster x4 (3160490 -> 638047)
BGRX8888 -> RGBA8888 : faster x5 (3308988 -> 631232)
BGRX8888 -> RGBX8888 : faster x5 (3216775 -> 638065)
RGB888 -> BGRA8888 : faster x4 (3143135 -> 655146)
RGB888 -> BGRX8888 : faster x4 (3141790 -> 653771)
RGB888 -> RGBA8888 : faster x5 (3214402 -> 637001)
RGB888 -> RGBX8888 : faster x4 (3143082 -> 630009)
RGBA8888 -> BGR888 : faster x3 (3157048 -> 920375)
RGBA8888 -> BGRX8888 : faster x5 (3196692 -> 632996)
RGBA8888 -> RGB888 : faster x4 (3141570 -> 652151)
RGBX8888 -> ABGR8888 : faster x5 (3175401 -> 631218)
RGBX8888 -> ARGB8888 : faster x4 (3144690 -> 639440)
RGBX8888 -> BGR888 : faster x4 (3144250 -> 630171)
RGBX8888 -> BGRA8888 : faster x5 (3220321 -> 630731)
RGBX8888 -> BGRX8888 : faster x4 (3178453 -> 637445)
RGBX8888 -> RGB888 : faster x5 (3203623 -> 632596)
diff --git a/src/video/SDL_blit_N.c b/src/video/SDL_blit_N.c
index 0886bed..6bb7113 100644
--- a/src/video/SDL_blit_N.c
+++ b/src/video/SDL_blit_N.c
@@ -2163,7 +2163,77 @@
SDL_PixelFormat *dstfmt = info->dst_fmt;
int dstbpp = dstfmt->BytesPerPixel;
unsigned alpha = dstfmt->Amask ? info->a : 0;
+
+ /* Any src/dst 8888 for 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;
+
+ /* Find the appropriate permutation */
+ int missing = 0, r, g, b, a;
+ int Pixel = 0x04030201; /* +1 */
+ RGB_FROM_PIXEL(Pixel, srcfmt, r, g, b);
+
+ if (dstfmt->Amask) {
+ PIXEL_FROM_RGBA(Pixel, dstfmt, r, g, b, 0);
+ } else {
+ PIXEL_FROM_RGB(Pixel, dstfmt, r, g, b);
+ }
+ 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 == 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(
+ {
+ 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;
+ }
+
while (height--) {
/* *INDENT-OFF* */
DUFFS_LOOP(
