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Diffstat (limited to 'source/3rd-party/SDL2/src/video/SDL_blit_A.c')
-rw-r--r--source/3rd-party/SDL2/src/video/SDL_blit_A.c1388
1 files changed, 1388 insertions, 0 deletions
diff --git a/source/3rd-party/SDL2/src/video/SDL_blit_A.c b/source/3rd-party/SDL2/src/video/SDL_blit_A.c
new file mode 100644
index 0000000..3507932
--- /dev/null
+++ b/source/3rd-party/SDL2/src/video/SDL_blit_A.c
@@ -0,0 +1,1388 @@
+/*
+ Simple DirectMedia Layer
+ Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
+
+ This software is provided 'as-is', without any express or implied
+ warranty. In no event will the authors be held liable for any damages
+ arising from the use of this software.
+
+ Permission is granted to anyone to use this software for any purpose,
+ including commercial applications, and to alter it and redistribute it
+ freely, subject to the following restrictions:
+
+ 1. The origin of this software must not be misrepresented; you must not
+ claim that you wrote the original software. If you use this software
+ in a product, an acknowledgment in the product documentation would be
+ appreciated but is not required.
+ 2. Altered source versions must be plainly marked as such, and must not be
+ misrepresented as being the original software.
+ 3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../SDL_internal.h"
+
+#include "SDL_video.h"
+#include "SDL_blit.h"
+
+/* Functions to perform alpha blended blitting */
+
+/* N->1 blending with per-surface alpha */
+static void
+BlitNto1SurfaceAlpha(SDL_BlitInfo * info)
+{
+ int width = info->dst_w;
+ int height = info->dst_h;
+ Uint8 *src = info->src;
+ int srcskip = info->src_skip;
+ Uint8 *dst = info->dst;
+ int dstskip = info->dst_skip;
+ Uint8 *palmap = info->table;
+ SDL_PixelFormat *srcfmt = info->src_fmt;
+ SDL_PixelFormat *dstfmt = info->dst_fmt;
+ int srcbpp = srcfmt->BytesPerPixel;
+ Uint32 Pixel;
+ unsigned sR, sG, sB;
+ unsigned dR, dG, dB;
+ const unsigned A = info->a;
+
+ while (height--) {
+ /* *INDENT-OFF* */
+ DUFFS_LOOP4(
+ {
+ DISEMBLE_RGB(src, srcbpp, srcfmt, Pixel, sR, sG, sB);
+ dR = dstfmt->palette->colors[*dst].r;
+ dG = dstfmt->palette->colors[*dst].g;
+ dB = dstfmt->palette->colors[*dst].b;
+ ALPHA_BLEND_RGB(sR, sG, sB, A, dR, dG, dB);
+ dR &= 0xff;
+ dG &= 0xff;
+ dB &= 0xff;
+ /* Pack RGB into 8bit pixel */
+ if ( palmap == NULL ) {
+ *dst =((dR>>5)<<(3+2))|((dG>>5)<<(2))|((dB>>6)<<(0));
+ } else {
+ *dst = palmap[((dR>>5)<<(3+2))|((dG>>5)<<(2))|((dB>>6)<<(0))];
+ }
+ dst++;
+ src += srcbpp;
+ },
+ width);
+ /* *INDENT-ON* */
+ src += srcskip;
+ dst += dstskip;
+ }
+}
+
+/* N->1 blending with pixel alpha */
+static void
+BlitNto1PixelAlpha(SDL_BlitInfo * info)
+{
+ int width = info->dst_w;
+ int height = info->dst_h;
+ Uint8 *src = info->src;
+ int srcskip = info->src_skip;
+ Uint8 *dst = info->dst;
+ int dstskip = info->dst_skip;
+ Uint8 *palmap = info->table;
+ SDL_PixelFormat *srcfmt = info->src_fmt;
+ SDL_PixelFormat *dstfmt = info->dst_fmt;
+ int srcbpp = srcfmt->BytesPerPixel;
+ Uint32 Pixel;
+ unsigned sR, sG, sB, sA;
+ unsigned dR, dG, dB;
+
+ while (height--) {
+ /* *INDENT-OFF* */
+ DUFFS_LOOP4(
+ {
+ DISEMBLE_RGBA(src,srcbpp,srcfmt,Pixel,sR,sG,sB,sA);
+ dR = dstfmt->palette->colors[*dst].r;
+ dG = dstfmt->palette->colors[*dst].g;
+ dB = dstfmt->palette->colors[*dst].b;
+ ALPHA_BLEND_RGB(sR, sG, sB, sA, dR, dG, dB);
+ dR &= 0xff;
+ dG &= 0xff;
+ dB &= 0xff;
+ /* Pack RGB into 8bit pixel */
+ if ( palmap == NULL ) {
+ *dst =((dR>>5)<<(3+2))|((dG>>5)<<(2))|((dB>>6)<<(0));
+ } else {
+ *dst = palmap[((dR>>5)<<(3+2))|((dG>>5)<<(2))|((dB>>6)<<(0))];
+ }
+ dst++;
+ src += srcbpp;
+ },
+ width);
+ /* *INDENT-ON* */
+ src += srcskip;
+ dst += dstskip;
+ }
+}
+
+/* colorkeyed N->1 blending with per-surface alpha */
+static void
+BlitNto1SurfaceAlphaKey(SDL_BlitInfo * info)
+{
+ int width = info->dst_w;
+ int height = info->dst_h;
+ Uint8 *src = info->src;
+ int srcskip = info->src_skip;
+ Uint8 *dst = info->dst;
+ int dstskip = info->dst_skip;
+ Uint8 *palmap = info->table;
+ SDL_PixelFormat *srcfmt = info->src_fmt;
+ SDL_PixelFormat *dstfmt = info->dst_fmt;
+ int srcbpp = srcfmt->BytesPerPixel;
+ Uint32 ckey = info->colorkey;
+ Uint32 Pixel;
+ unsigned sR, sG, sB;
+ unsigned dR, dG, dB;
+ const unsigned A = info->a;
+
+ while (height--) {
+ /* *INDENT-OFF* */
+ DUFFS_LOOP(
+ {
+ DISEMBLE_RGB(src, srcbpp, srcfmt, Pixel, sR, sG, sB);
+ if ( Pixel != ckey ) {
+ dR = dstfmt->palette->colors[*dst].r;
+ dG = dstfmt->palette->colors[*dst].g;
+ dB = dstfmt->palette->colors[*dst].b;
+ ALPHA_BLEND_RGB(sR, sG, sB, A, dR, dG, dB);
+ dR &= 0xff;
+ dG &= 0xff;
+ dB &= 0xff;
+ /* Pack RGB into 8bit pixel */
+ if ( palmap == NULL ) {
+ *dst =((dR>>5)<<(3+2))|((dG>>5)<<(2))|((dB>>6)<<(0));
+ } else {
+ *dst = palmap[((dR>>5)<<(3+2))|((dG>>5)<<(2))|((dB>>6)<<(0))];
+ }
+ }
+ dst++;
+ src += srcbpp;
+ },
+ width);
+ /* *INDENT-ON* */
+ src += srcskip;
+ dst += dstskip;
+ }
+}
+
+#ifdef __MMX__
+
+/* fast RGB888->(A)RGB888 blending with surface alpha=128 special case */
+static void
+BlitRGBtoRGBSurfaceAlpha128MMX(SDL_BlitInfo * info)
+{
+ int width = info->dst_w;
+ int height = info->dst_h;
+ Uint32 *srcp = (Uint32 *) info->src;
+ int srcskip = info->src_skip >> 2;
+ Uint32 *dstp = (Uint32 *) info->dst;
+ int dstskip = info->dst_skip >> 2;
+ Uint32 dalpha = info->dst_fmt->Amask;
+
+ __m64 src1, src2, dst1, dst2, lmask, hmask, dsta;
+
+ hmask = _mm_set_pi32(0x00fefefe, 0x00fefefe); /* alpha128 mask -> hmask */
+ lmask = _mm_set_pi32(0x00010101, 0x00010101); /* !alpha128 mask -> lmask */
+ dsta = _mm_set_pi32(dalpha, dalpha); /* dst alpha mask -> dsta */
+
+ while (height--) {
+ int n = width;
+ if (n & 1) {
+ Uint32 s = *srcp++;
+ Uint32 d = *dstp;
+ *dstp++ = ((((s & 0x00fefefe) + (d & 0x00fefefe)) >> 1)
+ + (s & d & 0x00010101)) | dalpha;
+ n--;
+ }
+
+ for (n >>= 1; n > 0; --n) {
+ dst1 = *(__m64 *) dstp; /* 2 x dst -> dst1(ARGBARGB) */
+ dst2 = dst1; /* 2 x dst -> dst2(ARGBARGB) */
+
+ src1 = *(__m64 *) srcp; /* 2 x src -> src1(ARGBARGB) */
+ src2 = src1; /* 2 x src -> src2(ARGBARGB) */
+
+ dst2 = _mm_and_si64(dst2, hmask); /* dst & mask -> dst2 */
+ src2 = _mm_and_si64(src2, hmask); /* src & mask -> src2 */
+ src2 = _mm_add_pi32(src2, dst2); /* dst2 + src2 -> src2 */
+ src2 = _mm_srli_pi32(src2, 1); /* src2 >> 1 -> src2 */
+
+ dst1 = _mm_and_si64(dst1, src1); /* src & dst -> dst1 */
+ dst1 = _mm_and_si64(dst1, lmask); /* dst1 & !mask -> dst1 */
+ dst1 = _mm_add_pi32(dst1, src2); /* src2 + dst1 -> dst1 */
+ dst1 = _mm_or_si64(dst1, dsta); /* dsta(full alpha) | dst1 -> dst1 */
+
+ *(__m64 *) dstp = dst1; /* dst1 -> 2 x dst pixels */
+ dstp += 2;
+ srcp += 2;
+ }
+
+ srcp += srcskip;
+ dstp += dstskip;
+ }
+ _mm_empty();
+}
+
+/* fast RGB888->(A)RGB888 blending with surface alpha */
+static void
+BlitRGBtoRGBSurfaceAlphaMMX(SDL_BlitInfo * info)
+{
+ SDL_PixelFormat *df = info->dst_fmt;
+ Uint32 chanmask;
+ unsigned alpha = info->a;
+
+ if (alpha == 128 && (df->Rmask | df->Gmask | df->Bmask) == 0x00FFFFFF) {
+ /* only call a128 version when R,G,B occupy lower bits */
+ BlitRGBtoRGBSurfaceAlpha128MMX(info);
+ } else {
+ int width = info->dst_w;
+ int height = info->dst_h;
+ Uint32 *srcp = (Uint32 *) info->src;
+ int srcskip = info->src_skip >> 2;
+ Uint32 *dstp = (Uint32 *) info->dst;
+ int dstskip = info->dst_skip >> 2;
+ Uint32 dalpha = df->Amask;
+ Uint32 amult;
+
+ __m64 src1, src2, dst1, dst2, mm_alpha, mm_zero, dsta;
+
+ mm_zero = _mm_setzero_si64(); /* 0 -> mm_zero */
+ /* form the alpha mult */
+ amult = alpha | (alpha << 8);
+ amult = amult | (amult << 16);
+ chanmask =
+ (0xff << df->Rshift) | (0xff << df->
+ Gshift) | (0xff << df->Bshift);
+ mm_alpha = _mm_set_pi32(0, amult & chanmask); /* 0000AAAA -> mm_alpha, minus 1 chan */
+ mm_alpha = _mm_unpacklo_pi8(mm_alpha, mm_zero); /* 0A0A0A0A -> mm_alpha, minus 1 chan */
+ /* at this point mm_alpha can be 000A0A0A or 0A0A0A00 or another combo */
+ dsta = _mm_set_pi32(dalpha, dalpha); /* dst alpha mask -> dsta */
+
+ while (height--) {
+ int n = width;
+ if (n & 1) {
+ /* One Pixel Blend */
+ src2 = _mm_cvtsi32_si64(*srcp); /* src(ARGB) -> src2 (0000ARGB) */
+ src2 = _mm_unpacklo_pi8(src2, mm_zero); /* 0A0R0G0B -> src2 */
+
+ dst1 = _mm_cvtsi32_si64(*dstp); /* dst(ARGB) -> dst1 (0000ARGB) */
+ dst1 = _mm_unpacklo_pi8(dst1, mm_zero); /* 0A0R0G0B -> dst1 */
+
+ src2 = _mm_sub_pi16(src2, dst1); /* src2 - dst2 -> src2 */
+ src2 = _mm_mullo_pi16(src2, mm_alpha); /* src2 * alpha -> src2 */
+ src2 = _mm_srli_pi16(src2, 8); /* src2 >> 8 -> src2 */
+ dst1 = _mm_add_pi8(src2, dst1); /* src2 + dst1 -> dst1 */
+
+ dst1 = _mm_packs_pu16(dst1, mm_zero); /* 0000ARGB -> dst1 */
+ dst1 = _mm_or_si64(dst1, dsta); /* dsta | dst1 -> dst1 */
+ *dstp = _mm_cvtsi64_si32(dst1); /* dst1 -> pixel */
+
+ ++srcp;
+ ++dstp;
+
+ n--;
+ }
+
+ for (n >>= 1; n > 0; --n) {
+ /* Two Pixels Blend */
+ src1 = *(__m64 *) srcp; /* 2 x src -> src1(ARGBARGB) */
+ src2 = src1; /* 2 x src -> src2(ARGBARGB) */
+ src1 = _mm_unpacklo_pi8(src1, mm_zero); /* low - 0A0R0G0B -> src1 */
+ src2 = _mm_unpackhi_pi8(src2, mm_zero); /* high - 0A0R0G0B -> src2 */
+
+ dst1 = *(__m64 *) dstp; /* 2 x dst -> dst1(ARGBARGB) */
+ dst2 = dst1; /* 2 x dst -> dst2(ARGBARGB) */
+ dst1 = _mm_unpacklo_pi8(dst1, mm_zero); /* low - 0A0R0G0B -> dst1 */
+ dst2 = _mm_unpackhi_pi8(dst2, mm_zero); /* high - 0A0R0G0B -> dst2 */
+
+ src1 = _mm_sub_pi16(src1, dst1); /* src1 - dst1 -> src1 */
+ src1 = _mm_mullo_pi16(src1, mm_alpha); /* src1 * alpha -> src1 */
+ src1 = _mm_srli_pi16(src1, 8); /* src1 >> 8 -> src1 */
+ dst1 = _mm_add_pi8(src1, dst1); /* src1 + dst1(dst1) -> dst1 */
+
+ src2 = _mm_sub_pi16(src2, dst2); /* src2 - dst2 -> src2 */
+ src2 = _mm_mullo_pi16(src2, mm_alpha); /* src2 * alpha -> src2 */
+ src2 = _mm_srli_pi16(src2, 8); /* src2 >> 8 -> src2 */
+ dst2 = _mm_add_pi8(src2, dst2); /* src2 + dst2(dst2) -> dst2 */
+
+ dst1 = _mm_packs_pu16(dst1, dst2); /* 0A0R0G0B(res1), 0A0R0G0B(res2) -> dst1(ARGBARGB) */
+ dst1 = _mm_or_si64(dst1, dsta); /* dsta | dst1 -> dst1 */
+
+ *(__m64 *) dstp = dst1; /* dst1 -> 2 x pixel */
+
+ srcp += 2;
+ dstp += 2;
+ }
+ srcp += srcskip;
+ dstp += dstskip;
+ }
+ _mm_empty();
+ }
+}
+
+/* fast ARGB888->(A)RGB888 blending with pixel alpha */
+static void
+BlitRGBtoRGBPixelAlphaMMX(SDL_BlitInfo * info)
+{
+ int width = info->dst_w;
+ int height = info->dst_h;
+ Uint32 *srcp = (Uint32 *) info->src;
+ int srcskip = info->src_skip >> 2;
+ Uint32 *dstp = (Uint32 *) info->dst;
+ int dstskip = info->dst_skip >> 2;
+ SDL_PixelFormat *sf = info->src_fmt;
+ Uint32 amask = sf->Amask;
+ Uint32 ashift = sf->Ashift;
+ Uint64 multmask, multmask2;
+
+ __m64 src1, dst1, mm_alpha, mm_zero, mm_alpha2;
+
+ mm_zero = _mm_setzero_si64(); /* 0 -> mm_zero */
+ multmask = 0x00FF;
+ multmask <<= (ashift * 2);
+ multmask2 = 0x00FF00FF00FF00FFULL;
+
+ while (height--) {
+ /* *INDENT-OFF* */
+ DUFFS_LOOP4({
+ Uint32 alpha = *srcp & amask;
+ if (alpha == 0) {
+ /* do nothing */
+ } else if (alpha == amask) {
+ *dstp = *srcp;
+ } else {
+ src1 = _mm_cvtsi32_si64(*srcp); /* src(ARGB) -> src1 (0000ARGB) */
+ src1 = _mm_unpacklo_pi8(src1, mm_zero); /* 0A0R0G0B -> src1 */
+
+ dst1 = _mm_cvtsi32_si64(*dstp); /* dst(ARGB) -> dst1 (0000ARGB) */
+ dst1 = _mm_unpacklo_pi8(dst1, mm_zero); /* 0A0R0G0B -> dst1 */
+
+ mm_alpha = _mm_cvtsi32_si64(alpha); /* alpha -> mm_alpha (0000000A) */
+ mm_alpha = _mm_srli_si64(mm_alpha, ashift); /* mm_alpha >> ashift -> mm_alpha(0000000A) */
+ mm_alpha = _mm_unpacklo_pi16(mm_alpha, mm_alpha); /* 00000A0A -> mm_alpha */
+ mm_alpha2 = _mm_unpacklo_pi32(mm_alpha, mm_alpha); /* 0A0A0A0A -> mm_alpha2 */
+ mm_alpha = _mm_or_si64(mm_alpha2, *(__m64 *) & multmask); /* 0F0A0A0A -> mm_alpha */
+ mm_alpha2 = _mm_xor_si64(mm_alpha2, *(__m64 *) & multmask2); /* 255 - mm_alpha -> mm_alpha */
+
+ /* blend */
+ src1 = _mm_mullo_pi16(src1, mm_alpha);
+ src1 = _mm_srli_pi16(src1, 8);
+ dst1 = _mm_mullo_pi16(dst1, mm_alpha2);
+ dst1 = _mm_srli_pi16(dst1, 8);
+ dst1 = _mm_add_pi16(src1, dst1);
+ dst1 = _mm_packs_pu16(dst1, mm_zero);
+
+ *dstp = _mm_cvtsi64_si32(dst1); /* dst1 -> pixel */
+ }
+ ++srcp;
+ ++dstp;
+ }, width);
+ /* *INDENT-ON* */
+ srcp += srcskip;
+ dstp += dstskip;
+ }
+ _mm_empty();
+}
+
+#endif /* __MMX__ */
+
+/* fast RGB888->(A)RGB888 blending with surface alpha=128 special case */
+static void
+BlitRGBtoRGBSurfaceAlpha128(SDL_BlitInfo * info)
+{
+ int width = info->dst_w;
+ int height = info->dst_h;
+ Uint32 *srcp = (Uint32 *) info->src;
+ int srcskip = info->src_skip >> 2;
+ Uint32 *dstp = (Uint32 *) info->dst;
+ int dstskip = info->dst_skip >> 2;
+
+ while (height--) {
+ /* *INDENT-OFF* */
+ DUFFS_LOOP4({
+ Uint32 s = *srcp++;
+ Uint32 d = *dstp;
+ *dstp++ = ((((s & 0x00fefefe) + (d & 0x00fefefe)) >> 1)
+ + (s & d & 0x00010101)) | 0xff000000;
+ }, width);
+ /* *INDENT-ON* */
+ srcp += srcskip;
+ dstp += dstskip;
+ }
+}
+
+/* fast RGB888->(A)RGB888 blending with surface alpha */
+static void
+BlitRGBtoRGBSurfaceAlpha(SDL_BlitInfo * info)
+{
+ unsigned alpha = info->a;
+ if (alpha == 128) {
+ BlitRGBtoRGBSurfaceAlpha128(info);
+ } else {
+ int width = info->dst_w;
+ int height = info->dst_h;
+ Uint32 *srcp = (Uint32 *) info->src;
+ int srcskip = info->src_skip >> 2;
+ Uint32 *dstp = (Uint32 *) info->dst;
+ int dstskip = info->dst_skip >> 2;
+ Uint32 s;
+ Uint32 d;
+ Uint32 s1;
+ Uint32 d1;
+
+ while (height--) {
+ /* *INDENT-OFF* */
+ DUFFS_LOOP4({
+ s = *srcp;
+ d = *dstp;
+ s1 = s & 0xff00ff;
+ d1 = d & 0xff00ff;
+ d1 = (d1 + ((s1 - d1) * alpha >> 8))
+ & 0xff00ff;
+ s &= 0xff00;
+ d &= 0xff00;
+ d = (d + ((s - d) * alpha >> 8)) & 0xff00;
+ *dstp = d1 | d | 0xff000000;
+ ++srcp;
+ ++dstp;
+ }, width);
+ /* *INDENT-ON* */
+ srcp += srcskip;
+ dstp += dstskip;
+ }
+ }
+}
+
+/* fast ARGB888->(A)RGB888 blending with pixel alpha */
+static void
+BlitRGBtoRGBPixelAlpha(SDL_BlitInfo * info)
+{
+ int width = info->dst_w;
+ int height = info->dst_h;
+ Uint32 *srcp = (Uint32 *) info->src;
+ int srcskip = info->src_skip >> 2;
+ Uint32 *dstp = (Uint32 *) info->dst;
+ int dstskip = info->dst_skip >> 2;
+
+ while (height--) {
+ /* *INDENT-OFF* */
+ DUFFS_LOOP4({
+ Uint32 dalpha;
+ Uint32 d;
+ Uint32 s1;
+ Uint32 d1;
+ Uint32 s = *srcp;
+ Uint32 alpha = s >> 24;
+ /* FIXME: Here we special-case opaque alpha since the
+ compositioning used (>>8 instead of /255) doesn't handle
+ it correctly. Also special-case alpha=0 for speed?
+ Benchmark this! */
+ if (alpha) {
+ if (alpha == SDL_ALPHA_OPAQUE) {
+ *dstp = *srcp;
+ } else {
+ /*
+ * take out the middle component (green), and process
+ * the other two in parallel. One multiply less.
+ */
+ d = *dstp;
+ dalpha = d >> 24;
+ s1 = s & 0xff00ff;
+ d1 = d & 0xff00ff;
+ d1 = (d1 + ((s1 - d1) * alpha >> 8)) & 0xff00ff;
+ s &= 0xff00;
+ d &= 0xff00;
+ d = (d + ((s - d) * alpha >> 8)) & 0xff00;
+ dalpha = alpha + (dalpha * (alpha ^ 0xFF) >> 8);
+ *dstp = d1 | d | (dalpha << 24);
+ }
+ }
+ ++srcp;
+ ++dstp;
+ }, width);
+ /* *INDENT-ON* */
+ srcp += srcskip;
+ dstp += dstskip;
+ }
+}
+
+#ifdef __3dNOW__
+/* fast (as in MMX with prefetch) ARGB888->(A)RGB888 blending with pixel alpha */
+static void
+BlitRGBtoRGBPixelAlphaMMX3DNOW(SDL_BlitInfo * info)
+{
+ int width = info->dst_w;
+ int height = info->dst_h;
+ Uint32 *srcp = (Uint32 *) info->src;
+ int srcskip = info->src_skip >> 2;
+ Uint32 *dstp = (Uint32 *) info->dst;
+ int dstskip = info->dst_skip >> 2;
+ SDL_PixelFormat *sf = info->src_fmt;
+ Uint32 amask = sf->Amask;
+ Uint32 ashift = sf->Ashift;
+ Uint64 multmask, multmask2;
+
+ __m64 src1, dst1, mm_alpha, mm_zero, mm_alpha2;
+
+ mm_zero = _mm_setzero_si64(); /* 0 -> mm_zero */
+ multmask = 0x00FF;
+ multmask <<= (ashift * 2);
+ multmask2 = 0x00FF00FF00FF00FFULL;
+
+ while (height--) {
+ /* *INDENT-OFF* */
+ DUFFS_LOOP4({
+ Uint32 alpha;
+
+ _m_prefetch(srcp + 16);
+ _m_prefetch(dstp + 16);
+
+ alpha = *srcp & amask;
+ if (alpha == 0) {
+ /* do nothing */
+ } else if (alpha == amask) {
+ *dstp = *srcp;
+ } else {
+ src1 = _mm_cvtsi32_si64(*srcp); /* src(ARGB) -> src1 (0000ARGB) */
+ src1 = _mm_unpacklo_pi8(src1, mm_zero); /* 0A0R0G0B -> src1 */
+
+ dst1 = _mm_cvtsi32_si64(*dstp); /* dst(ARGB) -> dst1 (0000ARGB) */
+ dst1 = _mm_unpacklo_pi8(dst1, mm_zero); /* 0A0R0G0B -> dst1 */
+
+ mm_alpha = _mm_cvtsi32_si64(alpha); /* alpha -> mm_alpha (0000000A) */
+ mm_alpha = _mm_srli_si64(mm_alpha, ashift); /* mm_alpha >> ashift -> mm_alpha(0000000A) */
+ mm_alpha = _mm_unpacklo_pi16(mm_alpha, mm_alpha); /* 00000A0A -> mm_alpha */
+ mm_alpha2 = _mm_unpacklo_pi32(mm_alpha, mm_alpha); /* 0A0A0A0A -> mm_alpha2 */
+ mm_alpha = _mm_or_si64(mm_alpha2, *(__m64 *) & multmask); /* 0F0A0A0A -> mm_alpha */
+ mm_alpha2 = _mm_xor_si64(mm_alpha2, *(__m64 *) & multmask2); /* 255 - mm_alpha -> mm_alpha */
+
+
+ /* blend */
+ src1 = _mm_mullo_pi16(src1, mm_alpha);
+ src1 = _mm_srli_pi16(src1, 8);
+ dst1 = _mm_mullo_pi16(dst1, mm_alpha2);
+ dst1 = _mm_srli_pi16(dst1, 8);
+ dst1 = _mm_add_pi16(src1, dst1);
+ dst1 = _mm_packs_pu16(dst1, mm_zero);
+
+ *dstp = _mm_cvtsi64_si32(dst1); /* dst1 -> pixel */
+ }
+ ++srcp;
+ ++dstp;
+ }, width);
+ /* *INDENT-ON* */
+ srcp += srcskip;
+ dstp += dstskip;
+ }
+ _mm_empty();
+}
+
+#endif /* __3dNOW__ */
+
+/* 16bpp special case for per-surface alpha=50%: blend 2 pixels in parallel */
+
+/* blend a single 16 bit pixel at 50% */
+#define BLEND16_50(d, s, mask) \
+ ((((s & mask) + (d & mask)) >> 1) + (s & d & (~mask & 0xffff)))
+
+/* blend two 16 bit pixels at 50% */
+#define BLEND2x16_50(d, s, mask) \
+ (((s & (mask | mask << 16)) >> 1) + ((d & (mask | mask << 16)) >> 1) \
+ + (s & d & (~(mask | mask << 16))))
+
+static void
+Blit16to16SurfaceAlpha128(SDL_BlitInfo * info, Uint16 mask)
+{
+ int width = info->dst_w;
+ int height = info->dst_h;
+ Uint16 *srcp = (Uint16 *) info->src;
+ int srcskip = info->src_skip >> 1;
+ Uint16 *dstp = (Uint16 *) info->dst;
+ int dstskip = info->dst_skip >> 1;
+
+ while (height--) {
+ if (((uintptr_t) srcp ^ (uintptr_t) dstp) & 2) {
+ /*
+ * Source and destination not aligned, pipeline it.
+ * This is mostly a win for big blits but no loss for
+ * small ones
+ */
+ Uint32 prev_sw;
+ int w = width;
+
+ /* handle odd destination */
+ if ((uintptr_t) dstp & 2) {
+ Uint16 d = *dstp, s = *srcp;
+ *dstp = BLEND16_50(d, s, mask);
+ dstp++;
+ srcp++;
+ w--;
+ }
+ srcp++; /* srcp is now 32-bit aligned */
+
+ /* bootstrap pipeline with first halfword */
+ prev_sw = ((Uint32 *) srcp)[-1];
+
+ while (w > 1) {
+ Uint32 sw, dw, s;
+ sw = *(Uint32 *) srcp;
+ dw = *(Uint32 *) dstp;
+#if SDL_BYTEORDER == SDL_BIG_ENDIAN
+ s = (prev_sw << 16) + (sw >> 16);
+#else
+ s = (prev_sw >> 16) + (sw << 16);
+#endif
+ prev_sw = sw;
+ *(Uint32 *) dstp = BLEND2x16_50(dw, s, mask);
+ dstp += 2;
+ srcp += 2;
+ w -= 2;
+ }
+
+ /* final pixel if any */
+ if (w) {
+ Uint16 d = *dstp, s;
+#if SDL_BYTEORDER == SDL_BIG_ENDIAN
+ s = (Uint16) prev_sw;
+#else
+ s = (Uint16) (prev_sw >> 16);
+#endif
+ *dstp = BLEND16_50(d, s, mask);
+ srcp++;
+ dstp++;
+ }
+ srcp += srcskip - 1;
+ dstp += dstskip;
+ } else {
+ /* source and destination are aligned */
+ int w = width;
+
+ /* first odd pixel? */
+ if ((uintptr_t) srcp & 2) {
+ Uint16 d = *dstp, s = *srcp;
+ *dstp = BLEND16_50(d, s, mask);
+ srcp++;
+ dstp++;
+ w--;
+ }
+ /* srcp and dstp are now 32-bit aligned */
+
+ while (w > 1) {
+ Uint32 sw = *(Uint32 *) srcp;
+ Uint32 dw = *(Uint32 *) dstp;
+ *(Uint32 *) dstp = BLEND2x16_50(dw, sw, mask);
+ srcp += 2;
+ dstp += 2;
+ w -= 2;
+ }
+
+ /* last odd pixel? */
+ if (w) {
+ Uint16 d = *dstp, s = *srcp;
+ *dstp = BLEND16_50(d, s, mask);
+ srcp++;
+ dstp++;
+ }
+ srcp += srcskip;
+ dstp += dstskip;
+ }
+ }
+}
+
+#ifdef __MMX__
+
+/* fast RGB565->RGB565 blending with surface alpha */
+static void
+Blit565to565SurfaceAlphaMMX(SDL_BlitInfo * info)
+{
+ unsigned alpha = info->a;
+ if (alpha == 128) {
+ Blit16to16SurfaceAlpha128(info, 0xf7de);
+ } else {
+ int width = info->dst_w;
+ int height = info->dst_h;
+ Uint16 *srcp = (Uint16 *) info->src;
+ int srcskip = info->src_skip >> 1;
+ Uint16 *dstp = (Uint16 *) info->dst;
+ int dstskip = info->dst_skip >> 1;
+ Uint32 s, d;
+
+ __m64 src1, dst1, src2, dst2, gmask, bmask, mm_res, mm_alpha;
+
+ alpha &= ~(1 + 2 + 4); /* cut alpha to get the exact same behaviour */
+ mm_alpha = _mm_set_pi32(0, alpha); /* 0000000A -> mm_alpha */
+ alpha >>= 3; /* downscale alpha to 5 bits */
+
+ mm_alpha = _mm_unpacklo_pi16(mm_alpha, mm_alpha); /* 00000A0A -> mm_alpha */
+ mm_alpha = _mm_unpacklo_pi32(mm_alpha, mm_alpha); /* 0A0A0A0A -> mm_alpha */
+ /* position alpha to allow for mullo and mulhi on diff channels
+ to reduce the number of operations */
+ mm_alpha = _mm_slli_si64(mm_alpha, 3);
+
+ /* Setup the 565 color channel masks */
+ gmask = _mm_set_pi32(0x07E007E0, 0x07E007E0); /* MASKGREEN -> gmask */
+ bmask = _mm_set_pi32(0x001F001F, 0x001F001F); /* MASKBLUE -> bmask */
+
+ while (height--) {
+ /* *INDENT-OFF* */
+ DUFFS_LOOP_124(
+ {
+ s = *srcp++;
+ d = *dstp;
+ /*
+ * shift out the middle component (green) to
+ * the high 16 bits, and process all three RGB
+ * components at the same time.
+ */
+ s = (s | s << 16) & 0x07e0f81f;
+ d = (d | d << 16) & 0x07e0f81f;
+ d += (s - d) * alpha >> 5;
+ d &= 0x07e0f81f;
+ *dstp++ = (Uint16)(d | d >> 16);
+ },{
+ s = *srcp++;
+ d = *dstp;
+ /*
+ * shift out the middle component (green) to
+ * the high 16 bits, and process all three RGB
+ * components at the same time.
+ */
+ s = (s | s << 16) & 0x07e0f81f;
+ d = (d | d << 16) & 0x07e0f81f;
+ d += (s - d) * alpha >> 5;
+ d &= 0x07e0f81f;
+ *dstp++ = (Uint16)(d | d >> 16);
+ s = *srcp++;
+ d = *dstp;
+ /*
+ * shift out the middle component (green) to
+ * the high 16 bits, and process all three RGB
+ * components at the same time.
+ */
+ s = (s | s << 16) & 0x07e0f81f;
+ d = (d | d << 16) & 0x07e0f81f;
+ d += (s - d) * alpha >> 5;
+ d &= 0x07e0f81f;
+ *dstp++ = (Uint16)(d | d >> 16);
+ },{
+ src1 = *(__m64*)srcp; /* 4 src pixels -> src1 */
+ dst1 = *(__m64*)dstp; /* 4 dst pixels -> dst1 */
+
+ /* red */
+ src2 = src1;
+ src2 = _mm_srli_pi16(src2, 11); /* src2 >> 11 -> src2 [000r 000r 000r 000r] */
+
+ dst2 = dst1;
+ dst2 = _mm_srli_pi16(dst2, 11); /* dst2 >> 11 -> dst2 [000r 000r 000r 000r] */
+
+ /* blend */
+ src2 = _mm_sub_pi16(src2, dst2);/* src - dst -> src2 */
+ src2 = _mm_mullo_pi16(src2, mm_alpha); /* src2 * alpha -> src2 */
+ src2 = _mm_srli_pi16(src2, 11); /* src2 >> 11 -> src2 */
+ dst2 = _mm_add_pi16(src2, dst2); /* src2 + dst2 -> dst2 */
+ dst2 = _mm_slli_pi16(dst2, 11); /* dst2 << 11 -> dst2 */
+
+ mm_res = dst2; /* RED -> mm_res */
+
+ /* green -- process the bits in place */
+ src2 = src1;
+ src2 = _mm_and_si64(src2, gmask); /* src & MASKGREEN -> src2 */
+
+ dst2 = dst1;
+ dst2 = _mm_and_si64(dst2, gmask); /* dst & MASKGREEN -> dst2 */
+
+ /* blend */
+ src2 = _mm_sub_pi16(src2, dst2);/* src - dst -> src2 */
+ src2 = _mm_mulhi_pi16(src2, mm_alpha); /* src2 * alpha -> src2 */
+ src2 = _mm_slli_pi16(src2, 5); /* src2 << 5 -> src2 */
+ dst2 = _mm_add_pi16(src2, dst2); /* src2 + dst2 -> dst2 */
+
+ mm_res = _mm_or_si64(mm_res, dst2); /* RED | GREEN -> mm_res */
+
+ /* blue */
+ src2 = src1;
+ src2 = _mm_and_si64(src2, bmask); /* src & MASKBLUE -> src2[000b 000b 000b 000b] */
+
+ dst2 = dst1;
+ dst2 = _mm_and_si64(dst2, bmask); /* dst & MASKBLUE -> dst2[000b 000b 000b 000b] */
+
+ /* blend */
+ src2 = _mm_sub_pi16(src2, dst2);/* src - dst -> src2 */
+ src2 = _mm_mullo_pi16(src2, mm_alpha); /* src2 * alpha -> src2 */
+ src2 = _mm_srli_pi16(src2, 11); /* src2 >> 11 -> src2 */
+ dst2 = _mm_add_pi16(src2, dst2); /* src2 + dst2 -> dst2 */
+ dst2 = _mm_and_si64(dst2, bmask); /* dst2 & MASKBLUE -> dst2 */
+
+ mm_res = _mm_or_si64(mm_res, dst2); /* RED | GREEN | BLUE -> mm_res */
+
+ *(__m64*)dstp = mm_res; /* mm_res -> 4 dst pixels */
+
+ srcp += 4;
+ dstp += 4;
+ }, width);
+ /* *INDENT-ON* */
+ srcp += srcskip;
+ dstp += dstskip;
+ }
+ _mm_empty();
+ }
+}
+
+/* fast RGB555->RGB555 blending with surface alpha */
+static void
+Blit555to555SurfaceAlphaMMX(SDL_BlitInfo * info)
+{
+ unsigned alpha = info->a;
+ if (alpha == 128) {
+ Blit16to16SurfaceAlpha128(info, 0xfbde);
+ } else {
+ int width = info->dst_w;
+ int height = info->dst_h;
+ Uint16 *srcp = (Uint16 *) info->src;
+ int srcskip = info->src_skip >> 1;
+ Uint16 *dstp = (Uint16 *) info->dst;
+ int dstskip = info->dst_skip >> 1;
+ Uint32 s, d;
+
+ __m64 src1, dst1, src2, dst2, rmask, gmask, bmask, mm_res, mm_alpha;
+
+ alpha &= ~(1 + 2 + 4); /* cut alpha to get the exact same behaviour */
+ mm_alpha = _mm_set_pi32(0, alpha); /* 0000000A -> mm_alpha */
+ alpha >>= 3; /* downscale alpha to 5 bits */
+
+ mm_alpha = _mm_unpacklo_pi16(mm_alpha, mm_alpha); /* 00000A0A -> mm_alpha */
+ mm_alpha = _mm_unpacklo_pi32(mm_alpha, mm_alpha); /* 0A0A0A0A -> mm_alpha */
+ /* position alpha to allow for mullo and mulhi on diff channels
+ to reduce the number of operations */
+ mm_alpha = _mm_slli_si64(mm_alpha, 3);
+
+ /* Setup the 555 color channel masks */
+ rmask = _mm_set_pi32(0x7C007C00, 0x7C007C00); /* MASKRED -> rmask */
+ gmask = _mm_set_pi32(0x03E003E0, 0x03E003E0); /* MASKGREEN -> gmask */
+ bmask = _mm_set_pi32(0x001F001F, 0x001F001F); /* MASKBLUE -> bmask */
+
+ while (height--) {
+ /* *INDENT-OFF* */
+ DUFFS_LOOP_124(
+ {
+ s = *srcp++;
+ d = *dstp;
+ /*
+ * shift out the middle component (green) to
+ * the high 16 bits, and process all three RGB
+ * components at the same time.
+ */
+ s = (s | s << 16) & 0x03e07c1f;
+ d = (d | d << 16) & 0x03e07c1f;
+ d += (s - d) * alpha >> 5;
+ d &= 0x03e07c1f;
+ *dstp++ = (Uint16)(d | d >> 16);
+ },{
+ s = *srcp++;
+ d = *dstp;
+ /*
+ * shift out the middle component (green) to
+ * the high 16 bits, and process all three RGB
+ * components at the same time.
+ */
+ s = (s | s << 16) & 0x03e07c1f;
+ d = (d | d << 16) & 0x03e07c1f;
+ d += (s - d) * alpha >> 5;
+ d &= 0x03e07c1f;
+ *dstp++ = (Uint16)(d | d >> 16);
+ s = *srcp++;
+ d = *dstp;
+ /*
+ * shift out the middle component (green) to
+ * the high 16 bits, and process all three RGB
+ * components at the same time.
+ */
+ s = (s | s << 16) & 0x03e07c1f;
+ d = (d | d << 16) & 0x03e07c1f;
+ d += (s - d) * alpha >> 5;
+ d &= 0x03e07c1f;
+ *dstp++ = (Uint16)(d | d >> 16);
+ },{
+ src1 = *(__m64*)srcp; /* 4 src pixels -> src1 */
+ dst1 = *(__m64*)dstp; /* 4 dst pixels -> dst1 */
+
+ /* red -- process the bits in place */
+ src2 = src1;
+ src2 = _mm_and_si64(src2, rmask); /* src & MASKRED -> src2 */
+
+ dst2 = dst1;
+ dst2 = _mm_and_si64(dst2, rmask); /* dst & MASKRED -> dst2 */
+
+ /* blend */
+ src2 = _mm_sub_pi16(src2, dst2);/* src - dst -> src2 */
+ src2 = _mm_mulhi_pi16(src2, mm_alpha); /* src2 * alpha -> src2 */
+ src2 = _mm_slli_pi16(src2, 5); /* src2 << 5 -> src2 */
+ dst2 = _mm_add_pi16(src2, dst2); /* src2 + dst2 -> dst2 */
+ dst2 = _mm_and_si64(dst2, rmask); /* dst2 & MASKRED -> dst2 */
+
+ mm_res = dst2; /* RED -> mm_res */
+
+ /* green -- process the bits in place */
+ src2 = src1;
+ src2 = _mm_and_si64(src2, gmask); /* src & MASKGREEN -> src2 */
+
+ dst2 = dst1;
+ dst2 = _mm_and_si64(dst2, gmask); /* dst & MASKGREEN -> dst2 */
+
+ /* blend */
+ src2 = _mm_sub_pi16(src2, dst2);/* src - dst -> src2 */
+ src2 = _mm_mulhi_pi16(src2, mm_alpha); /* src2 * alpha -> src2 */
+ src2 = _mm_slli_pi16(src2, 5); /* src2 << 5 -> src2 */
+ dst2 = _mm_add_pi16(src2, dst2); /* src2 + dst2 -> dst2 */
+
+ mm_res = _mm_or_si64(mm_res, dst2); /* RED | GREEN -> mm_res */
+
+ /* blue */
+ src2 = src1; /* src -> src2 */
+ src2 = _mm_and_si64(src2, bmask); /* src & MASKBLUE -> src2[000b 000b 000b 000b] */
+
+ dst2 = dst1; /* dst -> dst2 */
+ dst2 = _mm_and_si64(dst2, bmask); /* dst & MASKBLUE -> dst2[000b 000b 000b 000b] */
+
+ /* blend */
+ src2 = _mm_sub_pi16(src2, dst2);/* src - dst -> src2 */
+ src2 = _mm_mullo_pi16(src2, mm_alpha); /* src2 * alpha -> src2 */
+ src2 = _mm_srli_pi16(src2, 11); /* src2 >> 11 -> src2 */
+ dst2 = _mm_add_pi16(src2, dst2); /* src2 + dst2 -> dst2 */
+ dst2 = _mm_and_si64(dst2, bmask); /* dst2 & MASKBLUE -> dst2 */
+
+ mm_res = _mm_or_si64(mm_res, dst2); /* RED | GREEN | BLUE -> mm_res */
+
+ *(__m64*)dstp = mm_res; /* mm_res -> 4 dst pixels */
+
+ srcp += 4;
+ dstp += 4;
+ }, width);
+ /* *INDENT-ON* */
+ srcp += srcskip;
+ dstp += dstskip;
+ }
+ _mm_empty();
+ }
+}
+
+#endif /* __MMX__ */
+
+/* fast RGB565->RGB565 blending with surface alpha */
+static void
+Blit565to565SurfaceAlpha(SDL_BlitInfo * info)
+{
+ unsigned alpha = info->a;
+ if (alpha == 128) {
+ Blit16to16SurfaceAlpha128(info, 0xf7de);
+ } else {
+ int width = info->dst_w;
+ int height = info->dst_h;
+ Uint16 *srcp = (Uint16 *) info->src;
+ int srcskip = info->src_skip >> 1;
+ Uint16 *dstp = (Uint16 *) info->dst;
+ int dstskip = info->dst_skip >> 1;
+ alpha >>= 3; /* downscale alpha to 5 bits */
+
+ while (height--) {
+ /* *INDENT-OFF* */
+ DUFFS_LOOP4({
+ Uint32 s = *srcp++;
+ Uint32 d = *dstp;
+ /*
+ * shift out the middle component (green) to
+ * the high 16 bits, and process all three RGB
+ * components at the same time.
+ */
+ s = (s | s << 16) & 0x07e0f81f;
+ d = (d | d << 16) & 0x07e0f81f;
+ d += (s - d) * alpha >> 5;
+ d &= 0x07e0f81f;
+ *dstp++ = (Uint16)(d | d >> 16);
+ }, width);
+ /* *INDENT-ON* */
+ srcp += srcskip;
+ dstp += dstskip;
+ }
+ }
+}
+
+/* fast RGB555->RGB555 blending with surface alpha */
+static void
+Blit555to555SurfaceAlpha(SDL_BlitInfo * info)
+{
+ unsigned alpha = info->a; /* downscale alpha to 5 bits */
+ if (alpha == 128) {
+ Blit16to16SurfaceAlpha128(info, 0xfbde);
+ } else {
+ int width = info->dst_w;
+ int height = info->dst_h;
+ Uint16 *srcp = (Uint16 *) info->src;
+ int srcskip = info->src_skip >> 1;
+ Uint16 *dstp = (Uint16 *) info->dst;
+ int dstskip = info->dst_skip >> 1;
+ alpha >>= 3; /* downscale alpha to 5 bits */
+
+ while (height--) {
+ /* *INDENT-OFF* */
+ DUFFS_LOOP4({
+ Uint32 s = *srcp++;
+ Uint32 d = *dstp;
+ /*
+ * shift out the middle component (green) to
+ * the high 16 bits, and process all three RGB
+ * components at the same time.
+ */
+ s = (s | s << 16) & 0x03e07c1f;
+ d = (d | d << 16) & 0x03e07c1f;
+ d += (s - d) * alpha >> 5;
+ d &= 0x03e07c1f;
+ *dstp++ = (Uint16)(d | d >> 16);
+ }, width);
+ /* *INDENT-ON* */
+ srcp += srcskip;
+ dstp += dstskip;
+ }
+ }
+}
+
+/* fast ARGB8888->RGB565 blending with pixel alpha */
+static void
+BlitARGBto565PixelAlpha(SDL_BlitInfo * info)
+{
+ int width = info->dst_w;
+ int height = info->dst_h;
+ Uint32 *srcp = (Uint32 *) info->src;
+ int srcskip = info->src_skip >> 2;
+ Uint16 *dstp = (Uint16 *) info->dst;
+ int dstskip = info->dst_skip >> 1;
+
+ while (height--) {
+ /* *INDENT-OFF* */
+ DUFFS_LOOP4({
+ Uint32 s = *srcp;
+ unsigned alpha = s >> 27; /* downscale alpha to 5 bits */
+ /* FIXME: Here we special-case opaque alpha since the
+ compositioning used (>>8 instead of /255) doesn't handle
+ it correctly. Also special-case alpha=0 for speed?
+ Benchmark this! */
+ if(alpha) {
+ if(alpha == (SDL_ALPHA_OPAQUE >> 3)) {
+ *dstp = (Uint16)((s >> 8 & 0xf800) + (s >> 5 & 0x7e0) + (s >> 3 & 0x1f));
+ } else {
+ Uint32 d = *dstp;
+ /*
+ * convert source and destination to G0RAB65565
+ * and blend all components at the same time
+ */
+ s = ((s & 0xfc00) << 11) + (s >> 8 & 0xf800)
+ + (s >> 3 & 0x1f);
+ d = (d | d << 16) & 0x07e0f81f;
+ d += (s - d) * alpha >> 5;
+ d &= 0x07e0f81f;
+ *dstp = (Uint16)(d | d >> 16);
+ }
+ }
+ srcp++;
+ dstp++;
+ }, width);
+ /* *INDENT-ON* */
+ srcp += srcskip;
+ dstp += dstskip;
+ }
+}
+
+/* fast ARGB8888->RGB555 blending with pixel alpha */
+static void
+BlitARGBto555PixelAlpha(SDL_BlitInfo * info)
+{
+ int width = info->dst_w;
+ int height = info->dst_h;
+ Uint32 *srcp = (Uint32 *) info->src;
+ int srcskip = info->src_skip >> 2;
+ Uint16 *dstp = (Uint16 *) info->dst;
+ int dstskip = info->dst_skip >> 1;
+
+ while (height--) {
+ /* *INDENT-OFF* */
+ DUFFS_LOOP4({
+ unsigned alpha;
+ Uint32 s = *srcp;
+ alpha = s >> 27; /* downscale alpha to 5 bits */
+ /* FIXME: Here we special-case opaque alpha since the
+ compositioning used (>>8 instead of /255) doesn't handle
+ it correctly. Also special-case alpha=0 for speed?
+ Benchmark this! */
+ if(alpha) {
+ if(alpha == (SDL_ALPHA_OPAQUE >> 3)) {
+ *dstp = (Uint16)((s >> 9 & 0x7c00) + (s >> 6 & 0x3e0) + (s >> 3 & 0x1f));
+ } else {
+ Uint32 d = *dstp;
+ /*
+ * convert source and destination to G0RAB65565
+ * and blend all components at the same time
+ */
+ s = ((s & 0xf800) << 10) + (s >> 9 & 0x7c00)
+ + (s >> 3 & 0x1f);
+ d = (d | d << 16) & 0x03e07c1f;
+ d += (s - d) * alpha >> 5;
+ d &= 0x03e07c1f;
+ *dstp = (Uint16)(d | d >> 16);
+ }
+ }
+ srcp++;
+ dstp++;
+ }, width);
+ /* *INDENT-ON* */
+ srcp += srcskip;
+ dstp += dstskip;
+ }
+}
+
+/* General (slow) N->N blending with per-surface alpha */
+static void
+BlitNtoNSurfaceAlpha(SDL_BlitInfo * info)
+{
+ int width = info->dst_w;
+ int height = info->dst_h;
+ Uint8 *src = info->src;
+ int srcskip = info->src_skip;
+ Uint8 *dst = info->dst;
+ int dstskip = info->dst_skip;
+ SDL_PixelFormat *srcfmt = info->src_fmt;
+ SDL_PixelFormat *dstfmt = info->dst_fmt;
+ int srcbpp = srcfmt->BytesPerPixel;
+ int dstbpp = dstfmt->BytesPerPixel;
+ Uint32 Pixel;
+ unsigned sR, sG, sB;
+ unsigned dR, dG, dB, dA;
+ const unsigned sA = info->a;
+
+ if (sA) {
+ while (height--) {
+ /* *INDENT-OFF* */
+ DUFFS_LOOP4(
+ {
+ DISEMBLE_RGB(src, srcbpp, srcfmt, Pixel, sR, sG, sB);
+ DISEMBLE_RGBA(dst, dstbpp, dstfmt, Pixel, dR, dG, dB, dA);
+ ALPHA_BLEND_RGBA(sR, sG, sB, sA, dR, dG, dB, dA);
+ ASSEMBLE_RGBA(dst, dstbpp, dstfmt, dR, dG, dB, dA);
+ src += srcbpp;
+ dst += dstbpp;
+ },
+ width);
+ /* *INDENT-ON* */
+ src += srcskip;
+ dst += dstskip;
+ }
+ }
+}
+
+/* General (slow) colorkeyed N->N blending with per-surface alpha */
+static void
+BlitNtoNSurfaceAlphaKey(SDL_BlitInfo * info)
+{
+ int width = info->dst_w;
+ int height = info->dst_h;
+ Uint8 *src = info->src;
+ int srcskip = info->src_skip;
+ Uint8 *dst = info->dst;
+ int dstskip = info->dst_skip;
+ SDL_PixelFormat *srcfmt = info->src_fmt;
+ SDL_PixelFormat *dstfmt = info->dst_fmt;
+ Uint32 ckey = info->colorkey;
+ int srcbpp = srcfmt->BytesPerPixel;
+ int dstbpp = dstfmt->BytesPerPixel;
+ Uint32 Pixel;
+ unsigned sR, sG, sB;
+ unsigned dR, dG, dB, dA;
+ const unsigned sA = info->a;
+
+ while (height--) {
+ /* *INDENT-OFF* */
+ DUFFS_LOOP4(
+ {
+ RETRIEVE_RGB_PIXEL(src, srcbpp, Pixel);
+ if(sA && Pixel != ckey) {
+ RGB_FROM_PIXEL(Pixel, srcfmt, sR, sG, sB);
+ DISEMBLE_RGBA(dst, dstbpp, dstfmt, Pixel, dR, dG, dB, dA);
+ ALPHA_BLEND_RGBA(sR, sG, sB, sA, dR, dG, dB, dA);
+ ASSEMBLE_RGBA(dst, dstbpp, dstfmt, dR, dG, dB, dA);
+ }
+ src += srcbpp;
+ dst += dstbpp;
+ },
+ width);
+ /* *INDENT-ON* */
+ src += srcskip;
+ dst += dstskip;
+ }
+}
+
+/* General (slow) N->N blending with pixel alpha */
+static void
+BlitNtoNPixelAlpha(SDL_BlitInfo * info)
+{
+ int width = info->dst_w;
+ int height = info->dst_h;
+ Uint8 *src = info->src;
+ int srcskip = info->src_skip;
+ Uint8 *dst = info->dst;
+ int dstskip = info->dst_skip;
+ SDL_PixelFormat *srcfmt = info->src_fmt;
+ SDL_PixelFormat *dstfmt = info->dst_fmt;
+ int srcbpp;
+ int dstbpp;
+ Uint32 Pixel;
+ unsigned sR, sG, sB, sA;
+ unsigned dR, dG, dB, dA;
+
+ /* Set up some basic variables */
+ srcbpp = srcfmt->BytesPerPixel;
+ dstbpp = dstfmt->BytesPerPixel;
+
+ while (height--) {
+ /* *INDENT-OFF* */
+ DUFFS_LOOP4(
+ {
+ DISEMBLE_RGBA(src, srcbpp, srcfmt, Pixel, sR, sG, sB, sA);
+ if(sA) {
+ DISEMBLE_RGBA(dst, dstbpp, dstfmt, Pixel, dR, dG, dB, dA);
+ ALPHA_BLEND_RGBA(sR, sG, sB, sA, dR, dG, dB, dA);
+ ASSEMBLE_RGBA(dst, dstbpp, dstfmt, dR, dG, dB, dA);
+ }
+ src += srcbpp;
+ dst += dstbpp;
+ },
+ width);
+ /* *INDENT-ON* */
+ src += srcskip;
+ dst += dstskip;
+ }
+}
+
+
+SDL_BlitFunc
+SDL_CalculateBlitA(SDL_Surface * surface)
+{
+ SDL_PixelFormat *sf = surface->format;
+ SDL_PixelFormat *df = surface->map->dst->format;
+
+ switch (surface->map->info.flags & ~SDL_COPY_RLE_MASK) {
+ case SDL_COPY_BLEND:
+ /* Per-pixel alpha blits */
+ switch (df->BytesPerPixel) {
+ case 1:
+ return BlitNto1PixelAlpha;
+
+ case 2:
+ if (sf->BytesPerPixel == 4 && sf->Amask == 0xff000000
+ && sf->Gmask == 0xff00
+ && ((sf->Rmask == 0xff && df->Rmask == 0x1f)
+ || (sf->Bmask == 0xff && df->Bmask == 0x1f))) {
+ if (df->Gmask == 0x7e0)
+ return BlitARGBto565PixelAlpha;
+ else if (df->Gmask == 0x3e0)
+ return BlitARGBto555PixelAlpha;
+ }
+ return BlitNtoNPixelAlpha;
+
+ case 4:
+ if (sf->Rmask == df->Rmask
+ && sf->Gmask == df->Gmask
+ && sf->Bmask == df->Bmask && sf->BytesPerPixel == 4) {
+#if defined(__MMX__) || defined(__3dNOW__)
+ if (sf->Rshift % 8 == 0
+ && sf->Gshift % 8 == 0
+ && sf->Bshift % 8 == 0
+ && sf->Ashift % 8 == 0 && sf->Aloss == 0) {
+#ifdef __3dNOW__
+ if (SDL_Has3DNow())
+ return BlitRGBtoRGBPixelAlphaMMX3DNOW;
+#endif
+#ifdef __MMX__
+ if (SDL_HasMMX())
+ return BlitRGBtoRGBPixelAlphaMMX;
+#endif
+ }
+#endif /* __MMX__ || __3dNOW__ */
+ if (sf->Amask == 0xff000000) {
+ return BlitRGBtoRGBPixelAlpha;
+ }
+ }
+ return BlitNtoNPixelAlpha;
+
+ case 3:
+ default:
+ break;
+ }
+ return BlitNtoNPixelAlpha;
+
+ case SDL_COPY_MODULATE_ALPHA | SDL_COPY_BLEND:
+ if (sf->Amask == 0) {
+ /* Per-surface alpha blits */
+ switch (df->BytesPerPixel) {
+ case 1:
+ return BlitNto1SurfaceAlpha;
+
+ case 2:
+ if (surface->map->identity) {
+ if (df->Gmask == 0x7e0) {
+#ifdef __MMX__
+ if (SDL_HasMMX())
+ return Blit565to565SurfaceAlphaMMX;
+ else
+#endif
+ return Blit565to565SurfaceAlpha;
+ } else if (df->Gmask == 0x3e0) {
+#ifdef __MMX__
+ if (SDL_HasMMX())
+ return Blit555to555SurfaceAlphaMMX;
+ else
+#endif
+ return Blit555to555SurfaceAlpha;
+ }
+ }
+ return BlitNtoNSurfaceAlpha;
+
+ case 4:
+ if (sf->Rmask == df->Rmask
+ && sf->Gmask == df->Gmask
+ && sf->Bmask == df->Bmask && sf->BytesPerPixel == 4) {
+#ifdef __MMX__
+ if (sf->Rshift % 8 == 0
+ && sf->Gshift % 8 == 0
+ && sf->Bshift % 8 == 0 && SDL_HasMMX())
+ return BlitRGBtoRGBSurfaceAlphaMMX;
+#endif
+ if ((sf->Rmask | sf->Gmask | sf->Bmask) == 0xffffff) {
+ return BlitRGBtoRGBSurfaceAlpha;
+ }
+ }
+ return BlitNtoNSurfaceAlpha;
+
+ case 3:
+ default:
+ return BlitNtoNSurfaceAlpha;
+ }
+ }
+ break;
+
+ case SDL_COPY_COLORKEY | SDL_COPY_MODULATE_ALPHA | SDL_COPY_BLEND:
+ if (sf->Amask == 0) {
+ if (df->BytesPerPixel == 1) {
+ return BlitNto1SurfaceAlphaKey;
+ } else {
+ return BlitNtoNSurfaceAlphaKey;
+ }
+ }
+ break;
+ }
+
+ return NULL;
+}
+
+/* vi: set ts=4 sw=4 expandtab: */
generated by cgit v1.1-26-g67d0 at 2025-05-18 19:57:34 +0000