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SDL_blit_A.c
1466 lines (1325 loc) · 44.8 KB
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SDL_blit_A.c
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/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Sam Lantinga
slouken@libsdl.org
*/
#ifdef SAVE_RCSID
static char rcsid =
"@(#) $Id$";
#endif
#include <stdio.h>
#include "SDL_types.h"
#include "SDL_video.h"
#include "SDL_blit.h"
#if defined(i386) && defined(__GNUC__) && defined(USE_ASMBLIT)
/* Function to check the CPU flags */
#include "SDL_cpuinfo.h"
#include "mmx.h"
#endif
/* Functions to perform alpha blended blitting */
/* N->1 blending with per-surface alpha */
static void BlitNto1SurfaceAlpha(SDL_BlitInfo *info)
{
int width = info->d_width;
int height = info->d_height;
Uint8 *src = info->s_pixels;
int srcskip = info->s_skip;
Uint8 *dst = info->d_pixels;
int dstskip = info->d_skip;
Uint8 *palmap = info->table;
SDL_PixelFormat *srcfmt = info->src;
SDL_PixelFormat *dstfmt = info->dst;
int srcbpp = srcfmt->BytesPerPixel;
const unsigned A = srcfmt->alpha;
while ( height-- ) {
DUFFS_LOOP4(
{
Uint32 pixel;
unsigned sR;
unsigned sG;
unsigned sB;
unsigned dR;
unsigned dG;
unsigned dB;
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(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);
src += srcskip;
dst += dstskip;
}
}
/* N->1 blending with pixel alpha */
static void BlitNto1PixelAlpha(SDL_BlitInfo *info)
{
int width = info->d_width;
int height = info->d_height;
Uint8 *src = info->s_pixels;
int srcskip = info->s_skip;
Uint8 *dst = info->d_pixels;
int dstskip = info->d_skip;
Uint8 *palmap = info->table;
SDL_PixelFormat *srcfmt = info->src;
SDL_PixelFormat *dstfmt = info->dst;
int srcbpp = srcfmt->BytesPerPixel;
/* FIXME: fix alpha bit field expansion here too? */
while ( height-- ) {
DUFFS_LOOP4(
{
Uint32 pixel;
unsigned sR;
unsigned sG;
unsigned sB;
unsigned sA;
unsigned dR;
unsigned dG;
unsigned dB;
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(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);
src += srcskip;
dst += dstskip;
}
}
/* colorkeyed N->1 blending with per-surface alpha */
static void BlitNto1SurfaceAlphaKey(SDL_BlitInfo *info)
{
int width = info->d_width;
int height = info->d_height;
Uint8 *src = info->s_pixels;
int srcskip = info->s_skip;
Uint8 *dst = info->d_pixels;
int dstskip = info->d_skip;
Uint8 *palmap = info->table;
SDL_PixelFormat *srcfmt = info->src;
SDL_PixelFormat *dstfmt = info->dst;
int srcbpp = srcfmt->BytesPerPixel;
Uint32 ckey = srcfmt->colorkey;
const int A = srcfmt->alpha;
while ( height-- ) {
DUFFS_LOOP(
{
Uint32 pixel;
unsigned sR;
unsigned sG;
unsigned sB;
unsigned dR;
unsigned dG;
unsigned dB;
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(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);
src += srcskip;
dst += dstskip;
}
}
#if defined(i386) && defined(__GNUC__) && defined(USE_ASMBLIT)
/* fast RGB888->(A)RGB888 blending with surface alpha=128 special case */
static void BlitRGBtoRGBSurfaceAlpha128MMX(SDL_BlitInfo *info)
{
int width = info->d_width;
int height = info->d_height;
Uint32 *srcp = (Uint32 *)info->s_pixels;
int srcskip = info->s_skip >> 2;
Uint32 *dstp = (Uint32 *)info->d_pixels;
int dstskip = info->d_skip >> 2;
Uint8 load[8];
*(Uint64 *)load = 0x00fefefe00fefefeULL;/* alpha128 mask */
movq_m2r(*load, mm4); /* alpha128 mask -> mm4 */
*(Uint64 *)load = 0x0001010100010101ULL;/* !alpha128 mask */
movq_m2r(*load, mm3); /* !alpha128 mask -> mm3 */
*(Uint64 *)load = 0xFF000000FF000000ULL;/* dst alpha mask */
movq_m2r(*load, mm7); /* dst alpha mask -> mm7 */
while(height--) {
DUFFS_LOOP_DOUBLE2(
{
Uint32 s = *srcp++;
Uint32 d = *dstp;
*dstp++ = ((((s & 0x00fefefe) + (d & 0x00fefefe)) >> 1)
+ (s & d & 0x00010101)) | 0xff000000;
},{
movq_m2r((*dstp), mm2);/* 2 x dst -> mm2(ARGBARGB) */
movq_r2r(mm2, mm6); /* 2 x dst -> mm6(ARGBARGB) */
movq_m2r((*srcp), mm1);/* 2 x src -> mm1(ARGBARGB) */
movq_r2r(mm1, mm5); /* 2 x src -> mm5(ARGBARGB) */
pand_r2r(mm4, mm6); /* dst & mask -> mm6 */
pand_r2r(mm4, mm5); /* src & mask -> mm5 */
paddd_r2r(mm6, mm5); /* mm6 + mm5 -> mm5 */
psrld_i2r(1, mm5); /* mm5 >> 1 -> mm5 */
pand_r2r(mm1, mm2); /* src & dst -> mm2 */
pand_r2r(mm3, mm2); /* mm2 & !mask -> mm2 */
paddd_r2r(mm5, mm2); /* mm5 + mm2 -> mm2 */
por_r2r(mm7, mm2); /* mm7(full alpha) | mm2 -> mm2 */
movq_r2m(mm2, (*dstp));/* mm2 -> 2 x dst pixels */
dstp += 2;
srcp += 2;
}, width);
srcp += srcskip;
dstp += dstskip;
}
emms();
}
/* fast RGB888->(A)RGB888 blending with surface alpha */
static void BlitRGBtoRGBSurfaceAlphaMMX(SDL_BlitInfo *info)
{
unsigned alpha = info->src->alpha;
if(alpha == 128) {
BlitRGBtoRGBSurfaceAlpha128MMX(info);
} else {
int width = info->d_width;
int height = info->d_height;
Uint32 *srcp = (Uint32 *)info->s_pixels;
int srcskip = info->s_skip >> 2;
Uint32 *dstp = (Uint32 *)info->d_pixels;
int dstskip = info->d_skip >> 2;
Uint8 load[8] = {alpha, alpha, alpha, alpha,
alpha, alpha, alpha, alpha};
movq_m2r(*load, mm4); /* alpha -> mm4 */
*(Uint64 *)load = 0x00FF00FF00FF00FFULL;
movq_m2r(*load, mm3); /* mask -> mm3 */
pand_r2r(mm3, mm4); /* mm4 & mask -> 0A0A0A0A -> mm4 */
*(Uint64 *)load = 0xFF000000FF000000ULL;/* dst alpha mask */
movq_m2r(*load, mm7); /* dst alpha mask -> mm7 */
while(height--) {
DUFFS_LOOP_DOUBLE2({
/* One Pixel Blend */
movd_m2r((*srcp), mm1);/* src(ARGB) -> mm1 (0000ARGB)*/
punpcklbw_r2r(mm1, mm1); /* AARRGGBB -> mm1 */
pand_r2r(mm3, mm1); /* 0A0R0G0B -> mm1 */
movd_m2r((*dstp), mm2);/* dst(ARGB) -> mm2 (0000ARGB)*/
movq_r2r(mm2, mm6);/* dst(ARGB) -> mm6 (0000ARGB)*/
punpcklbw_r2r(mm2, mm2); /* AARRGGBB -> mm2 */
pand_r2r(mm3, mm2); /* 0A0R0G0B -> mm2 */
psubw_r2r(mm2, mm1);/* src - dst -> mm1 */
pmullw_r2r(mm4, mm1); /* mm1 * alpha -> mm1 */
psrlw_i2r(8, mm1); /* mm1 >> 8 -> mm1 */
paddw_r2r(mm1, mm2); /* mm1 + mm2(dst) -> mm2 */
pand_r2r(mm3, mm2); /* 0A0R0G0B -> mm2 */
packuswb_r2r(mm2, mm2); /* ARGBARGB -> mm2 */
por_r2r(mm7, mm2); /* mm7(full alpha) | mm2 -> mm2 */
movd_r2m(mm2, *dstp);/* mm2 -> pixel */
++srcp;
++dstp;
},{
/* Two Pixels Blend */
movq_m2r((*srcp), mm0);/* 2 x src -> mm0(ARGBARGB)*/
movq_r2r(mm0, mm1); /* 2 x src -> mm1(ARGBARGB) */
punpcklbw_r2r(mm0, mm0); /* low - AARRGGBB -> mm0 */
pand_r2r(mm3, mm0); /* 0A0R0G0B -> mm0(src1) */
punpckhbw_r2r(mm1, mm1); /* high - AARRGGBB -> mm1 */
pand_r2r(mm3, mm1); /* 0A0R0G0B -> mm1(src2) */
movq_m2r((*dstp), mm2);/* 2 x dst -> mm2(ARGBARGB) */
movq_r2r(mm2, mm5); /* 2 x dst -> mm5(ARGBARGB) */
movq_r2r(mm2, mm6); /* 2 x dst -> mm6(ARGBARGB) */
punpcklbw_r2r(mm2, mm2); /* low - AARRGGBB -> mm2 */
punpckhbw_r2r(mm6, mm6); /* high - AARRGGBB -> mm6 */
pand_r2r(mm3, mm2); /* 0A0R0G0B -> mm2(dst1) */
psubw_r2r(mm2, mm0);/* src1 - dst1 -> mm0 */
pmullw_r2r(mm4, mm0); /* mm0 * alpha -> mm0 */
pand_r2r(mm3, mm6); /* 0A0R0G0B -> mm6(dst2) */
psrlw_i2r(8, mm0); /* mm0 >> 8 -> mm1 */
psubw_r2r(mm6, mm1);/* src2 - dst2 -> mm1 */
pmullw_r2r(mm4, mm1); /* mm1 * alpha -> mm1 */
paddw_r2r(mm0, mm2); /* mm0 + mm2(dst1) -> mm2 */
psrlw_i2r(8, mm1); /* mm1 >> 8 -> mm0 */
pand_r2r(mm3, mm2); /* 0A0R0G0B -> mm2 */
paddw_r2r(mm1, mm6); /* mm1 + mm6(dst2) -> mm6 */
pand_r2r(mm3, mm6); /* 0A0R0G0B -> mm6 */
packuswb_r2r(mm2, mm2); /* ARGBARGB -> mm2 */
packuswb_r2r(mm6, mm6); /* ARGBARGB -> mm6 */
psrlq_i2r(32, mm2); /* mm2 >> 32 -> mm2 */
psllq_i2r(32, mm6); /* mm6 << 32 -> mm6 */
por_r2r(mm6, mm2); /* mm6 | mm2 -> mm2 */
por_r2r(mm7, mm2); /* mm7(full alpha) | mm2 -> mm2 */
movq_r2m(mm2, *dstp);/* mm2 -> 2 x pixel */
srcp += 2;
dstp += 2;
}, width);
srcp += srcskip;
dstp += dstskip;
}
emms();
}
}
/* fast ARGB888->(A)RGB888 blending with pixel alpha */
static void BlitRGBtoRGBPixelAlphaMMX(SDL_BlitInfo *info)
{
int width = info->d_width;
int height = info->d_height;
Uint32 *srcp = (Uint32 *)info->s_pixels;
int srcskip = info->s_skip >> 2;
Uint32 *dstp = (Uint32 *)info->d_pixels;
int dstskip = info->d_skip >> 2;
Uint32 alpha = 0;
Uint8 load[8];
*(Uint64 *)load = 0x00FF00FF00FF00FFULL;
movq_m2r(*load, mm3); /* mask -> mm2 */
*(Uint64 *)load = 0x00FF000000000000ULL;
movq_m2r(*load, mm7); /* dst alpha mask -> mm2 */
*(Uint64 *)load = 0x00FFFFFF00FFFFFFULL;
movq_m2r(*load, mm0); /* alpha 255 mask -> mm0 */
*(Uint64 *)load = 0xFF000000FF000000ULL;
movq_m2r(*load, mm6); /* alpha 255 !mask -> mm6 */
while(height--) {
DUFFS_LOOP4({
alpha = *srcp;
alpha >>= 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) {
movd_m2r((*srcp), mm1);/* src(ARGB) -> mm1 (0000ARGB)*/
movd_m2r((*dstp), mm2);/* dst(ARGB) -> mm2 (0000ARGB)*/
pand_r2r(mm0, mm1);
pand_r2r(mm6, mm2);
por_r2r(mm1, mm2);
movd_r2m(mm2, (*dstp));
} else {
movd_m2r((*srcp), mm1);/* src(ARGB) -> mm1 (0000ARGB)*/
punpcklbw_r2r(mm1, mm1); /* AARRGGBB -> mm1 */
pand_r2r(mm3, mm1); /* 0A0R0G0B -> mm1 */
movd_m2r((*dstp), mm2);/* dst(ARGB) -> mm2 (0000ARGB)*/
punpcklbw_r2r(mm2, mm2); /* AARRGGBB -> mm2 */
pand_r2r(mm3, mm2); /* 0A0R0G0B -> mm2 */
movq_r2r(mm2, mm5);/* mm2(0A0R0G0B) -> mm5 */
pand_r2r(mm7, mm5); /* mm5 & dst alpha mask -> mm5(0A000000) */
psrlq_i2r(24, mm5); /* mm5 >> 24 -> mm5 (0000A000)*/
movq_r2r(mm1, mm4);/* mm1(0A0R0G0B) -> mm4 */
psrlq_i2r(48, mm4); /* mm4 >> 48 -> mm4(0000000A) */
punpcklwd_r2r(mm4, mm4); /* 00000A0A -> mm4 */
punpcklwd_r2r(mm4, mm4); /* 0A0A0A0A -> mm4 */
/* blend */
psubw_r2r(mm2, mm1);/* src - dst -> mm1 */
pmullw_r2r(mm4, mm1); /* mm1 * alpha -> mm1 */
psrlw_i2r(8, mm1); /* mm1 >> 8 -> mm1 */
paddw_r2r(mm1, mm2); /* mm1 + mm2(dst) -> mm2 */
pand_r2r(mm3, mm2); /* 0A0R0G0B -> mm2 */
packuswb_r2r(mm2, mm2); /* ARGBARGB -> mm2 */
pand_r2r(mm0, mm2); /* 0RGB0RGB -> mm2 */
por_r2r(mm5, mm2); /* dst alpha | mm2 -> mm2 */
movd_r2m(mm2, *dstp);/* mm2 -> dst */
}
}
++srcp;
++dstp;
}, width);
srcp += srcskip;
dstp += dstskip;
}
emms();
}
#endif
/* fast RGB888->(A)RGB888 blending with surface alpha=128 special case */
static void BlitRGBtoRGBSurfaceAlpha128(SDL_BlitInfo *info)
{
int width = info->d_width;
int height = info->d_height;
Uint32 *srcp = (Uint32 *)info->s_pixels;
int srcskip = info->s_skip >> 2;
Uint32 *dstp = (Uint32 *)info->d_pixels;
int dstskip = info->d_skip >> 2;
while(height--) {
DUFFS_LOOP4({
Uint32 s = *srcp++;
Uint32 d = *dstp;
*dstp++ = ((((s & 0x00fefefe) + (d & 0x00fefefe)) >> 1)
+ (s & d & 0x00010101)) | 0xff000000;
}, width);
srcp += srcskip;
dstp += dstskip;
}
}
/* fast RGB888->(A)RGB888 blending with surface alpha */
static void BlitRGBtoRGBSurfaceAlpha(SDL_BlitInfo *info)
{
unsigned alpha = info->src->alpha;
if(alpha == 128) {
BlitRGBtoRGBSurfaceAlpha128(info);
} else {
int width = info->d_width;
int height = info->d_height;
Uint32 *srcp = (Uint32 *)info->s_pixels;
int srcskip = info->s_skip >> 2;
Uint32 *dstp = (Uint32 *)info->d_pixels;
int dstskip = info->d_skip >> 2;
Uint32 s;
Uint32 d;
Uint32 s1;
Uint32 d1;
while(height--) {
DUFFS_LOOP_DOUBLE2({
/* One Pixel Blend */
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;
},{
/* Two Pixels Blend */
s = *srcp;
d = *dstp;
s1 = s & 0xff00ff;
d1 = d & 0xff00ff;
d1 += (s1 - d1) * alpha >> 8;
d1 &= 0xff00ff;
s = ((s & 0xff00) >> 8) |
((srcp[1] & 0xff00) << 8);
d = ((d & 0xff00) >> 8) |
((dstp[1] & 0xff00) << 8);
d += (s - d) * alpha >> 8;
d &= 0x00ff00ff;
*dstp++ = d1 | ((d << 8) & 0xff00) | 0xff000000;
++srcp;
s1 = *srcp;
d1 = *dstp;
s1 &= 0xff00ff;
d1 &= 0xff00ff;
d1 += (s1 - d1) * alpha >> 8;
d1 &= 0xff00ff;
*dstp = d1 | ((d >> 8) & 0xff00) | 0xff000000;
++srcp;
++dstp;
}, width);
srcp += srcskip;
dstp += dstskip;
}
}
}
/* fast ARGB888->(A)RGB888 blending with pixel alpha */
static void BlitRGBtoRGBPixelAlpha(SDL_BlitInfo *info)
{
int width = info->d_width;
int height = info->d_height;
Uint32 *srcp = (Uint32 *)info->s_pixels;
int srcskip = info->s_skip >> 2;
Uint32 *dstp = (Uint32 *)info->d_pixels;
int dstskip = info->d_skip >> 2;
while(height--) {
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 = (s & 0x00ffffff) | (*dstp & 0xff000000);
} else {
/*
* take out the middle component (green), and process
* the other two in parallel. One multiply less.
*/
d = *dstp;
dalpha = d & 0xff000000;
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 | dalpha;
}
}
++srcp;
++dstp;
}, width);
srcp += srcskip;
dstp += dstskip;
}
}
#if defined(i386) && defined(__GNUC__) && defined(USE_ASMBLIT)
/* fast (as in MMX with prefetch) ARGB888->(A)RGB888 blending with pixel alpha */
inline static void BlitRGBtoRGBPixelAlphaMMX3DNOW(SDL_BlitInfo *info)
{
int width = info->d_width;
int height = info->d_height;
Uint32 *srcp = (Uint32 *)info->s_pixels;
int srcskip = info->s_skip >> 2;
Uint32 *dstp = (Uint32 *)info->d_pixels;
int dstskip = info->d_skip >> 2;
Uint32 s;
Uint32 alpha;
__asm__ (
/* make mm6 all zeros. */
"pxor %%mm6, %%mm6\n"
/* Make a mask to preserve the alpha. */
"pcmpeqb %%mm7, %%mm7\n\t" /* mm7(s) = FF FF FF FF | FF FF FF FF */
"psrlq $16, %%mm7\n\t" /* mm7(s) = 00 00 FF FF | FF FF FF FF */
: );
while(height--) {
DUFFS_LOOP4({
__asm__ (
"prefetch 64(%0)\n"
"prefetch 64(%1)\n"
: : "r" (srcp), "r" (dstp) );
s = *srcp;
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 == SDL_ALPHA_OPAQUE) {
*dstp = (s & 0x00ffffff) | (*dstp & 0xff000000);
}
else {
__asm__ (
/* load in the source, and dst. */
"movd (%0), %%mm0\n" /* mm0(s) = 0 0 0 0 | As Rs Gs Bs */
"movd (%1), %%mm1\n" /* mm1(d) = 0 0 0 0 | Ad Rd Gd Bd */
/* Move the src alpha into mm2 */
/* if supporting pshufw */
/*"pshufw $0x55, %%mm0, %%mm2\n" */ /* mm2 = 0 As 0 As | 0 As 0 As */
/*"psrlw $8, %%mm2\n" */
/* else: */
"movq %%mm0, %%mm2\n"
"psrld $24, %%mm2\n" /* mm2 = 0 0 0 0 | 0 0 0 As */
"punpcklwd %%mm2, %%mm2\n" /* mm2 = 0 0 0 0 | 0 As 0 As */
"punpckldq %%mm2, %%mm2\n" /* mm2 = 0 As 0 As | 0 As 0 As */
/* move the colors into words. */
"punpcklbw %%mm6, %%mm0\n" /* mm0 = 0 As 0 Rs | 0 Gs 0 Bs */
"punpcklbw %%mm6, %%mm1\n" /* mm0 = 0 Ad 0 Rd | 0 Gd 0 Bd */
/* src - dst */
"psubw %%mm1, %%mm0\n" /* mm0 = As-Ad Rs-Rd | Gs-Gd Bs-Bd */
/* A * (src-dst) */
"pmullw %%mm2, %%mm0\n" /* mm0 = As*As-d As*Rs-d | As*Gs-d As*Bs-d */
"pand %%mm7, %%mm0\n" /* to preserve dest alpha */
"psrlw $8, %%mm0\n" /* mm0 = Ac>>8 Rc>>8 | Gc>>8 Bc>>8 */
"paddb %%mm1, %%mm0\n" /* mm0 = Ac+Ad Rc+Rd | Gc+Gd Bc+Bd */
"packuswb %%mm0, %%mm0\n" /* mm0 = | Ac Rc Gc Bc */
"movd %%mm0, (%1)\n" /* result in mm0 */
: : "r" (srcp), "r" (dstp) );
}
++srcp;
++dstp;
}, width);
srcp += srcskip;
dstp += dstskip;
}
__asm__ (
"emms\n"
: );
}
#endif
/* 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->d_width;
int height = info->d_height;
Uint16 *srcp = (Uint16 *)info->s_pixels;
int srcskip = info->s_skip >> 1;
Uint16 *dstp = (Uint16 *)info->d_pixels;
int dstskip = info->d_skip >> 1;
while(height--) {
if(((unsigned long)srcp ^ (unsigned long)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((unsigned long)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);
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 = prev_sw;
else
s = prev_sw >> 16;
*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((unsigned long)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;
}
}
}
#if defined(i386) && defined(__GNUC__) && defined(USE_ASMBLIT)
/* fast RGB565->RGB565 blending with surface alpha */
static void Blit565to565SurfaceAlphaMMX(SDL_BlitInfo *info)
{
unsigned alpha = info->src->alpha; /* downscale alpha to 5 bits */
if(alpha == 128) {
Blit16to16SurfaceAlpha128(info, 0xf7de);
} else {
int width = info->d_width;
int height = info->d_height;
Uint16 *srcp = (Uint16 *)info->s_pixels;
int srcskip = info->s_skip >> 1;
Uint16 *dstp = (Uint16 *)info->d_pixels;
int dstskip = info->d_skip >> 1;
Uint32 s, d;
Uint8 load[8];
alpha &= ~(1+2+4); /* cut alpha to get the exact same behaviour */
*(Uint64 *)load = alpha;
alpha >>= 3; /* downscale alpha to 5 bits */
movq_m2r(*load, mm0); /* alpha(0000000A) -> mm0 */
punpcklwd_r2r(mm0, mm0); /* 00000A0A -> mm0 */
punpcklwd_r2r(mm0, mm0); /* 0A0A0A0A -> mm0 */
/* Setup the 565 color channel masks */
*(Uint64 *)load = 0xF800F800F800F800ULL;
movq_m2r(*load, mm1); /* MASKRED -> mm1 */
*(Uint64 *)load = 0x07E007E007E007E0ULL;
movq_m2r(*load, mm4); /* MASKGREEN -> mm4 */
*(Uint64 *)load = 0x001F001F001F001FULL;
movq_m2r(*load, mm7); /* MASKBLUE -> mm7 */
while(height--) {
DUFFS_LOOP_QUATRO2(
{
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++ = 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++ = 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++ = d | d >> 16;
},{
movq_m2r((*dstp), mm3);/* 4 dst pixels -> mm3 */
movq_m2r((*srcp), mm2);/* 4 src pixels -> mm2 */
/* RED */
movq_r2r(mm2, mm5); /* src -> mm5 */
pand_r2r(mm1 , mm5); /* src & MASKRED -> mm5 */
psrlq_i2r(11, mm5); /* mm5 >> 11 -> mm5 [000r 000r 000r 000r] */
movq_r2r(mm3, mm6); /* dst -> mm6 */
pand_r2r(mm1 , mm6); /* dst & MASKRED -> mm6 */
psrlq_i2r(11, mm6); /* mm6 >> 11 -> mm6 [000r 000r 000r 000r] */
/* blend */
psubw_r2r(mm6, mm5);/* src - dst -> mm5 */
pmullw_r2r(mm0, mm5); /* mm5 * alpha -> mm5 */
psrlw_i2r(8, mm5); /* mm5 >> 8 -> mm5 */
paddw_r2r(mm5, mm6); /* mm5 + mm6(dst) -> mm6 */
psllq_i2r(11, mm6); /* mm6 << 11 -> mm6 */
pand_r2r(mm1, mm6); /* mm6 & MASKRED -> mm6 */
movq_r2r(mm4, mm5); /* MASKGREEN -> mm5 */
por_r2r(mm7, mm5); /* MASKBLUE | mm5 -> mm5 */
pand_r2r(mm5, mm3); /* mm3 & mm5(!MASKRED) -> mm3 */
por_r2r(mm6, mm3); /* save new reds in dsts */
/* green */
movq_r2r(mm2, mm5); /* src -> mm5 */
pand_r2r(mm4 , mm5); /* src & MASKGREEN -> mm5 */
psrlq_i2r(5, mm5); /* mm5 >> 5 -> mm5 [000g 000g 000g 000g] */
movq_r2r(mm3, mm6); /* dst -> mm6 */
pand_r2r(mm4 , mm6); /* dst & MASKGREEN -> mm6 */
psrlq_i2r(5, mm6); /* mm6 >> 5 -> mm6 [000g 000g 000g 000g] */
/* blend */
psubw_r2r(mm6, mm5);/* src - dst -> mm5 */
pmullw_r2r(mm0, mm5); /* mm5 * alpha -> mm5 */
psrlw_i2r(8, mm5); /* mm5 >> 8 -> mm5 */
paddw_r2r(mm5, mm6); /* mm5 + mm6(dst) -> mm6 */
psllq_i2r(5, mm6); /* mm6 << 5 -> mm6 */
pand_r2r(mm4, mm6); /* mm6 & MASKGREEN -> mm6 */
movq_r2r(mm1, mm5); /* MASKRED -> mm5 */
por_r2r(mm7, mm5); /* MASKBLUE | mm5 -> mm5 */
pand_r2r(mm5, mm3); /* mm3 & mm5(!MASKGREEN) -> mm3 */
por_r2r(mm6, mm3); /* save new greens in dsts */
/* blue */
movq_r2r(mm2, mm5); /* src -> mm5 */
pand_r2r(mm7 , mm5); /* src & MASKRED -> mm5[000b 000b 000b 000b] */
movq_r2r(mm3, mm6); /* dst -> mm6 */
pand_r2r(mm7 , mm6); /* dst & MASKBLUE -> mm6[000b 000b 000b 000b] */
/* blend */
psubw_r2r(mm6, mm5);/* src - dst -> mm5 */
pmullw_r2r(mm0, mm5); /* mm5 * alpha -> mm5 */
psrlw_i2r(8, mm5); /* mm5 >> 8 -> mm5 */
paddw_r2r(mm5, mm6); /* mm5 + mm6(dst) -> mm6 */
pand_r2r(mm7, mm6); /* mm6 & MASKBLUE -> mm6 */
movq_r2r(mm1, mm5); /* MASKRED -> mm5 */
por_r2r(mm4, mm5); /* MASKGREEN | mm5 -> mm5 */
pand_r2r(mm5, mm3); /* mm3 & mm5(!MASKBLUE) -> mm3 */
por_r2r(mm6, mm3); /* save new blues in dsts */
movq_r2m(mm3, *dstp);/* mm3 -> 4 dst pixels */
srcp += 4;
dstp += 4;
}, width);
srcp += srcskip;
dstp += dstskip;
}
emms();
}
}
/* fast RGB555->RGB555 blending with surface alpha */
static void Blit555to555SurfaceAlphaMMX(SDL_BlitInfo *info)
{
unsigned alpha = info->src->alpha; /* downscale alpha to 5 bits */
if(alpha == 128) {
Blit16to16SurfaceAlpha128(info, 0xfbde);
} else {
int width = info->d_width;
int height = info->d_height;
Uint16 *srcp = (Uint16 *)info->s_pixels;
int srcskip = info->s_skip >> 1;
Uint16 *dstp = (Uint16 *)info->d_pixels;
int dstskip = info->d_skip >> 1;
Uint32 s, d;
Uint8 load[8];
alpha &= ~(1+2+4); /* cut alpha to get the exact same behaviour */
*(Uint64 *)load = alpha;
alpha >>= 3; /* downscale alpha to 5 bits */
movq_m2r(*load, mm0); /* alpha(0000000A) -> mm0 */
punpcklwd_r2r(mm0, mm0); /* 00000A0A -> mm0 */
punpcklwd_r2r(mm0, mm0); /* 0A0A0A0A -> mm0 */
/* Setup the 555 color channel masks */
*(Uint64 *)load = 0x7C007C007C007C00ULL;
movq_m2r(*load, mm1); /* MASKRED -> mm1 */
*(Uint64 *)load = 0x03E003E003E003E0ULL;
movq_m2r(*load, mm4); /* MASKGREEN -> mm4 */
*(Uint64 *)load = 0x001F001F001F001FULL;
movq_m2r(*load, mm7); /* MASKBLUE -> mm7 */
while(height--) {
DUFFS_LOOP_QUATRO2(
{
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++ = 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++ = 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++ = d | d >> 16;
},{
movq_m2r((*dstp), mm3);/* 4 dst pixels -> mm3 */
movq_m2r((*srcp), mm2);/* 4 src pixels -> mm2 */
/* RED */
movq_r2r(mm2, mm5); /* src -> mm5 */
pand_r2r(mm1 , mm5); /* src & MASKRED -> mm5 */
psrlq_i2r(10, mm5); /* mm5 >> 10 -> mm5 [000r 000r 000r 000r] */
movq_r2r(mm3, mm6); /* dst -> mm6 */
pand_r2r(mm1 , mm6); /* dst & MASKRED -> mm6 */
psrlq_i2r(10, mm6); /* mm6 >> 10 -> mm6 [000r 000r 000r 000r] */
/* blend */
psubw_r2r(mm6, mm5);/* src - dst -> mm5 */
pmullw_r2r(mm0, mm5); /* mm5 * alpha -> mm5 */
psrlw_i2r(8, mm5); /* mm5 >> 8 -> mm5 */