/*
- Simple DirectMedia Layer
- Copyright (C) 1997-2016 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.
+ SDL - Simple DirectMedia Layer
+ Copyright (C) 1997-2012 Sam Lantinga
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+
+ Sam Lantinga
+ slouken@libsdl.org
*/
-#include "../SDL_internal.h"
+#include "SDL_config.h"
#include "SDL_video.h"
#include "SDL_blit.h"
/* Functions to blit from 8-bit surfaces to other surfaces */
-static void
-Blit1to1(SDL_BlitInfo * info)
+static void Blit1to1(SDL_BlitInfo *info)
{
#ifndef USE_DUFFS_LOOP
- int c;
+ int c;
#endif
- int width, height;
- Uint8 *src, *map, *dst;
- int srcskip, dstskip;
-
- /* Set up some basic variables */
- width = info->dst_w;
- height = info->dst_h;
- src = info->src;
- srcskip = info->src_skip;
- dst = info->dst;
- dstskip = info->dst_skip;
- map = info->table;
-
- while (height--) {
+ int width, height;
+ Uint8 *src, *map, *dst;
+ int srcskip, dstskip;
+
+ /* Set up some basic variables */
+ width = info->d_width;
+ height = info->d_height;
+ src = info->s_pixels;
+ srcskip = info->s_skip;
+ dst = info->d_pixels;
+ dstskip = info->d_skip;
+ map = info->table;
+
+ while ( height-- ) {
#ifdef USE_DUFFS_LOOP
- /* *INDENT-OFF* */
DUFFS_LOOP(
{
*dst = map[*src];
dst++;
src++;
, width);
- /* *INDENT-ON* */
#else
- for (c = width; c; --c) {
- *dst = map[*src];
- dst++;
- src++;
- }
+ for ( c=width; c; --c ) {
+ *dst = map[*src];
+ dst++;
+ src++;
+ }
#endif
- src += srcskip;
- dst += dstskip;
- }
+ src += srcskip;
+ dst += dstskip;
+ }
}
-
/* This is now endian dependent */
#if ( SDL_BYTEORDER == SDL_LIL_ENDIAN )
#define HI 1
#define HI 0
#define LO 1
#endif
-static void
-Blit1to2(SDL_BlitInfo * info)
+static void Blit1to2(SDL_BlitInfo *info)
{
#ifndef USE_DUFFS_LOOP
- int c;
+ int c;
#endif
- int width, height;
- Uint8 *src, *dst;
- Uint16 *map;
- int srcskip, dstskip;
-
- /* Set up some basic variables */
- width = info->dst_w;
- height = info->dst_h;
- src = info->src;
- srcskip = info->src_skip;
- dst = info->dst;
- dstskip = info->dst_skip;
- map = (Uint16 *) info->table;
+ int width, height;
+ Uint8 *src, *dst;
+ Uint16 *map;
+ int srcskip, dstskip;
+
+ /* Set up some basic variables */
+ width = info->d_width;
+ height = info->d_height;
+ src = info->s_pixels;
+ srcskip = info->s_skip;
+ dst = info->d_pixels;
+ dstskip = info->d_skip;
+ map = (Uint16 *)info->table;
#ifdef USE_DUFFS_LOOP
- while (height--) {
- /* *INDENT-OFF* */
+ while ( height-- ) {
DUFFS_LOOP(
{
*(Uint16 *)dst = map[*src++];
dst += 2;
},
width);
- /* *INDENT-ON* */
- src += srcskip;
- dst += dstskip;
- }
+ src += srcskip;
+ dst += dstskip;
+ }
#else
- /* Memory align at 4-byte boundary, if necessary */
- if ((long) dst & 0x03) {
- /* Don't do anything if width is 0 */
- if (width == 0) {
- return;
- }
- --width;
-
- while (height--) {
- /* Perform copy alignment */
- *(Uint16 *) dst = map[*src++];
- dst += 2;
-
- /* Copy in 4 pixel chunks */
- for (c = width / 4; c; --c) {
- *(Uint32 *) dst = (map[src[HI]] << 16) | (map[src[LO]]);
- src += 2;
- dst += 4;
- *(Uint32 *) dst = (map[src[HI]] << 16) | (map[src[LO]]);
- src += 2;
- dst += 4;
- }
- /* Get any leftovers */
- switch (width & 3) {
- case 3:
- *(Uint16 *) dst = map[*src++];
- dst += 2;
- case 2:
- *(Uint32 *) dst = (map[src[HI]] << 16) | (map[src[LO]]);
- src += 2;
- dst += 4;
- break;
- case 1:
- *(Uint16 *) dst = map[*src++];
- dst += 2;
- break;
- }
- src += srcskip;
- dst += dstskip;
- }
- } else {
- while (height--) {
- /* Copy in 4 pixel chunks */
- for (c = width / 4; c; --c) {
- *(Uint32 *) dst = (map[src[HI]] << 16) | (map[src[LO]]);
- src += 2;
- dst += 4;
- *(Uint32 *) dst = (map[src[HI]] << 16) | (map[src[LO]]);
- src += 2;
- dst += 4;
- }
- /* Get any leftovers */
- switch (width & 3) {
- case 3:
- *(Uint16 *) dst = map[*src++];
- dst += 2;
- case 2:
- *(Uint32 *) dst = (map[src[HI]] << 16) | (map[src[LO]]);
- src += 2;
- dst += 4;
- break;
- case 1:
- *(Uint16 *) dst = map[*src++];
- dst += 2;
- break;
- }
- src += srcskip;
- dst += dstskip;
- }
- }
+ /* Memory align at 4-byte boundary, if necessary */
+ if ( (long)dst & 0x03 ) {
+ /* Don't do anything if width is 0 */
+ if ( width == 0 ) {
+ return;
+ }
+ --width;
+
+ while ( height-- ) {
+ /* Perform copy alignment */
+ *(Uint16 *)dst = map[*src++];
+ dst += 2;
+
+ /* Copy in 4 pixel chunks */
+ for ( c=width/4; c; --c ) {
+ *(Uint32 *)dst =
+ (map[src[HI]]<<16)|(map[src[LO]]);
+ src += 2;
+ dst += 4;
+ *(Uint32 *)dst =
+ (map[src[HI]]<<16)|(map[src[LO]]);
+ src += 2;
+ dst += 4;
+ }
+ /* Get any leftovers */
+ switch (width & 3) {
+ case 3:
+ *(Uint16 *)dst = map[*src++];
+ dst += 2;
+ case 2:
+ *(Uint32 *)dst =
+ (map[src[HI]]<<16)|(map[src[LO]]);
+ src += 2;
+ dst += 4;
+ break;
+ case 1:
+ *(Uint16 *)dst = map[*src++];
+ dst += 2;
+ break;
+ }
+ src += srcskip;
+ dst += dstskip;
+ }
+ } else {
+ while ( height-- ) {
+ /* Copy in 4 pixel chunks */
+ for ( c=width/4; c; --c ) {
+ *(Uint32 *)dst =
+ (map[src[HI]]<<16)|(map[src[LO]]);
+ src += 2;
+ dst += 4;
+ *(Uint32 *)dst =
+ (map[src[HI]]<<16)|(map[src[LO]]);
+ src += 2;
+ dst += 4;
+ }
+ /* Get any leftovers */
+ switch (width & 3) {
+ case 3:
+ *(Uint16 *)dst = map[*src++];
+ dst += 2;
+ case 2:
+ *(Uint32 *)dst =
+ (map[src[HI]]<<16)|(map[src[LO]]);
+ src += 2;
+ dst += 4;
+ break;
+ case 1:
+ *(Uint16 *)dst = map[*src++];
+ dst += 2;
+ break;
+ }
+ src += srcskip;
+ dst += dstskip;
+ }
+ }
#endif /* USE_DUFFS_LOOP */
}
-
-static void
-Blit1to3(SDL_BlitInfo * info)
+static void Blit1to3(SDL_BlitInfo *info)
{
#ifndef USE_DUFFS_LOOP
- int c;
+ int c;
#endif
- int o;
- int width, height;
- Uint8 *src, *map, *dst;
- int srcskip, dstskip;
-
- /* Set up some basic variables */
- width = info->dst_w;
- height = info->dst_h;
- src = info->src;
- srcskip = info->src_skip;
- dst = info->dst;
- dstskip = info->dst_skip;
- map = info->table;
-
- while (height--) {
+ int o;
+ int width, height;
+ Uint8 *src, *map, *dst;
+ int srcskip, dstskip;
+
+ /* Set up some basic variables */
+ width = info->d_width;
+ height = info->d_height;
+ src = info->s_pixels;
+ srcskip = info->s_skip;
+ dst = info->d_pixels;
+ dstskip = info->d_skip;
+ map = info->table;
+
+ while ( height-- ) {
#ifdef USE_DUFFS_LOOP
- /* *INDENT-OFF* */
DUFFS_LOOP(
{
o = *src * 4;
src++;
dst += 3;
, width);
- /* *INDENT-ON* */
#else
- for (c = width; c; --c) {
- o = *src * 4;
- dst[0] = map[o++];
- dst[1] = map[o++];
- dst[2] = map[o++];
- src++;
- dst += 3;
- }
+ for ( c=width; c; --c ) {
+ o = *src * 4;
+ dst[0] = map[o++];
+ dst[1] = map[o++];
+ dst[2] = map[o++];
+ src++;
+ dst += 3;
+ }
#endif /* USE_DUFFS_LOOP */
- src += srcskip;
- dst += dstskip;
- }
+ src += srcskip;
+ dst += dstskip;
+ }
}
-
-static void
-Blit1to4(SDL_BlitInfo * info)
+static void Blit1to4(SDL_BlitInfo *info)
{
#ifndef USE_DUFFS_LOOP
- int c;
+ int c;
#endif
- int width, height;
- Uint8 *src;
- Uint32 *map, *dst;
- int srcskip, dstskip;
-
- /* Set up some basic variables */
- width = info->dst_w;
- height = info->dst_h;
- src = info->src;
- srcskip = info->src_skip;
- dst = (Uint32 *) info->dst;
- dstskip = info->dst_skip / 4;
- map = (Uint32 *) info->table;
-
- while (height--) {
+ int width, height;
+ Uint8 *src;
+ Uint32 *map, *dst;
+ int srcskip, dstskip;
+
+ /* Set up some basic variables */
+ width = info->d_width;
+ height = info->d_height;
+ src = info->s_pixels;
+ srcskip = info->s_skip;
+ dst = (Uint32 *)info->d_pixels;
+ dstskip = info->d_skip/4;
+ map = (Uint32 *)info->table;
+
+ while ( height-- ) {
#ifdef USE_DUFFS_LOOP
- /* *INDENT-OFF* */
DUFFS_LOOP(
*dst++ = map[*src++];
, width);
- /* *INDENT-ON* */
#else
- for (c = width / 4; c; --c) {
- *dst++ = map[*src++];
- *dst++ = map[*src++];
- *dst++ = map[*src++];
- *dst++ = map[*src++];
- }
- switch (width & 3) {
- case 3:
- *dst++ = map[*src++];
- case 2:
- *dst++ = map[*src++];
- case 1:
- *dst++ = map[*src++];
- }
+ for ( c=width/4; c; --c ) {
+ *dst++ = map[*src++];
+ *dst++ = map[*src++];
+ *dst++ = map[*src++];
+ *dst++ = map[*src++];
+ }
+ switch ( width & 3 ) {
+ case 3:
+ *dst++ = map[*src++];
+ case 2:
+ *dst++ = map[*src++];
+ case 1:
+ *dst++ = map[*src++];
+ }
#endif /* USE_DUFFS_LOOP */
- src += srcskip;
- dst += dstskip;
- }
+ src += srcskip;
+ dst += dstskip;
+ }
}
-static void
-Blit1to1Key(SDL_BlitInfo * info)
+static void Blit1to1Key(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;
- Uint32 ckey = info->colorkey;
-
- if (palmap) {
- while (height--) {
- /* *INDENT-OFF* */
+ 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;
+ Uint32 ckey = info->src->colorkey;
+
+ if ( palmap ) {
+ while ( height-- ) {
DUFFS_LOOP(
{
if ( *src != ckey ) {
src++;
},
width);
- /* *INDENT-ON* */
- src += srcskip;
- dst += dstskip;
- }
- } else {
- while (height--) {
- /* *INDENT-OFF* */
+ src += srcskip;
+ dst += dstskip;
+ }
+ } else {
+ while ( height-- ) {
DUFFS_LOOP(
{
if ( *src != ckey ) {
src++;
},
width);
- /* *INDENT-ON* */
- src += srcskip;
- dst += dstskip;
- }
- }
+ src += srcskip;
+ dst += dstskip;
+ }
+ }
}
-static void
-Blit1to2Key(SDL_BlitInfo * info)
+static void Blit1to2Key(SDL_BlitInfo *info)
{
- int width = info->dst_w;
- int height = info->dst_h;
- Uint8 *src = info->src;
- int srcskip = info->src_skip;
- Uint16 *dstp = (Uint16 *) info->dst;
- int dstskip = info->dst_skip;
- Uint16 *palmap = (Uint16 *) info->table;
- Uint32 ckey = info->colorkey;
-
- /* Set up some basic variables */
- dstskip /= 2;
-
- while (height--) {
- /* *INDENT-OFF* */
+ int width = info->d_width;
+ int height = info->d_height;
+ Uint8 *src = info->s_pixels;
+ int srcskip = info->s_skip;
+ Uint16 *dstp = (Uint16 *)info->d_pixels;
+ int dstskip = info->d_skip;
+ Uint16 *palmap = (Uint16 *)info->table;
+ Uint32 ckey = info->src->colorkey;
+
+ /* Set up some basic variables */
+ dstskip /= 2;
+
+ while ( height-- ) {
DUFFS_LOOP(
{
if ( *src != ckey ) {
dstp++;
},
width);
- /* *INDENT-ON* */
- src += srcskip;
- dstp += dstskip;
- }
+ src += srcskip;
+ dstp += dstskip;
+ }
}
-static void
-Blit1to3Key(SDL_BlitInfo * info)
+static void Blit1to3Key(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;
- Uint32 ckey = info->colorkey;
- int o;
-
- while (height--) {
- /* *INDENT-OFF* */
+ 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;
+ Uint32 ckey = info->src->colorkey;
+ int o;
+
+ while ( height-- ) {
DUFFS_LOOP(
{
if ( *src != ckey ) {
dst += 3;
},
width);
- /* *INDENT-ON* */
- src += srcskip;
- dst += dstskip;
- }
+ src += srcskip;
+ dst += dstskip;
+ }
}
-static void
-Blit1to4Key(SDL_BlitInfo * info)
+static void Blit1to4Key(SDL_BlitInfo *info)
{
- int width = info->dst_w;
- int height = info->dst_h;
- Uint8 *src = info->src;
- int srcskip = info->src_skip;
- Uint32 *dstp = (Uint32 *) info->dst;
- int dstskip = info->dst_skip;
- Uint32 *palmap = (Uint32 *) info->table;
- Uint32 ckey = info->colorkey;
-
- /* Set up some basic variables */
- dstskip /= 4;
-
- while (height--) {
- /* *INDENT-OFF* */
+ int width = info->d_width;
+ int height = info->d_height;
+ Uint8 *src = info->s_pixels;
+ int srcskip = info->s_skip;
+ Uint32 *dstp = (Uint32 *)info->d_pixels;
+ int dstskip = info->d_skip;
+ Uint32 *palmap = (Uint32 *)info->table;
+ Uint32 ckey = info->src->colorkey;
+
+ /* Set up some basic variables */
+ dstskip /= 4;
+
+ while ( height-- ) {
DUFFS_LOOP(
{
if ( *src != ckey ) {
dstp++;
},
width);
- /* *INDENT-ON* */
- src += srcskip;
- dstp += dstskip;
- }
+ src += srcskip;
+ dstp += dstskip;
+ }
}
-static void
-Blit1toNAlpha(SDL_BlitInfo * info)
+static void Blit1toNAlpha(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 *dstfmt = info->dst_fmt;
- const SDL_Color *srcpal = info->src_fmt->palette->colors;
- int dstbpp;
- Uint32 pixel;
- unsigned sR, sG, sB;
- unsigned dR, dG, dB, dA;
- const unsigned A = info->a;
-
- /* Set up some basic variables */
- dstbpp = dstfmt->BytesPerPixel;
-
- while (height--) {
- /* *INDENT-OFF* */
- DUFFS_LOOP4(
- {
- sR = srcpal[*src].r;
- sG = srcpal[*src].g;
- sB = srcpal[*src].b;
- DISEMBLE_RGBA(dst, dstbpp, dstfmt, pixel, dR, dG, dB, dA);
- ALPHA_BLEND_RGBA(sR, sG, sB, A, dR, dG, dB, dA);
- ASSEMBLE_RGBA(dst, dstbpp, dstfmt, dR, dG, dB, dA);
- src++;
- dst += dstbpp;
- },
- width);
- /* *INDENT-ON* */
- src += srcskip;
- dst += dstskip;
- }
+ 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;
+ SDL_PixelFormat *dstfmt = info->dst;
+ const SDL_Color *srcpal = info->src->palette->colors;
+ int dstbpp;
+ const int A = info->src->alpha;
+
+ /* Set up some basic variables */
+ dstbpp = dstfmt->BytesPerPixel;
+
+ while ( height-- ) {
+ int sR, sG, sB;
+ int dR, dG, dB;
+ DUFFS_LOOP4(
+ {
+ Uint32 pixel;
+ sR = srcpal[*src].r;
+ sG = srcpal[*src].g;
+ sB = srcpal[*src].b;
+ DISEMBLE_RGB(dst, dstbpp, dstfmt,
+ pixel, dR, dG, dB);
+ ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB);
+ ASSEMBLE_RGB(dst, dstbpp, dstfmt, dR, dG, dB);
+ src++;
+ dst += dstbpp;
+ },
+ width);
+ src += srcskip;
+ dst += dstskip;
+ }
}
-static void
-Blit1toNAlphaKey(SDL_BlitInfo * info)
+static void Blit1toNAlphaKey(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 *dstfmt = info->dst_fmt;
- const SDL_Color *srcpal = info->src_fmt->palette->colors;
- Uint32 ckey = info->colorkey;
- int dstbpp;
- Uint32 pixel;
- unsigned sR, sG, sB;
- unsigned dR, dG, dB, dA;
- const unsigned A = info->a;
-
- /* Set up some basic variables */
- dstbpp = dstfmt->BytesPerPixel;
-
- while (height--) {
- /* *INDENT-OFF* */
+ 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;
+ SDL_PixelFormat *srcfmt = info->src;
+ SDL_PixelFormat *dstfmt = info->dst;
+ const SDL_Color *srcpal = info->src->palette->colors;
+ Uint32 ckey = srcfmt->colorkey;
+ int dstbpp;
+ const int A = srcfmt->alpha;
+
+ /* Set up some basic variables */
+ dstbpp = dstfmt->BytesPerPixel;
+
+ while ( height-- ) {
+ int sR, sG, sB;
+ int dR, dG, dB;
DUFFS_LOOP(
{
if ( *src != ckey ) {
+ Uint32 pixel;
sR = srcpal[*src].r;
sG = srcpal[*src].g;
sB = srcpal[*src].b;
- DISEMBLE_RGBA(dst, dstbpp, dstfmt, pixel, dR, dG, dB, dA);
- ALPHA_BLEND_RGBA(sR, sG, sB, A, dR, dG, dB, dA);
- ASSEMBLE_RGBA(dst, dstbpp, dstfmt, dR, dG, dB, dA);
+ DISEMBLE_RGB(dst, dstbpp, dstfmt,
+ pixel, dR, dG, dB);
+ ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB);
+ ASSEMBLE_RGB(dst, dstbpp, dstfmt, dR, dG, dB);
}
src++;
dst += dstbpp;
},
width);
- /* *INDENT-ON* */
- src += srcskip;
- dst += dstskip;
- }
+ src += srcskip;
+ dst += dstskip;
+ }
}
-static const SDL_BlitFunc one_blit[] = {
- (SDL_BlitFunc) NULL, Blit1to1, Blit1to2, Blit1to3, Blit1to4
+static SDL_loblit one_blit[] = {
+ NULL, Blit1to1, Blit1to2, Blit1to3, Blit1to4
};
-static const SDL_BlitFunc one_blitkey[] = {
- (SDL_BlitFunc) NULL, Blit1to1Key, Blit1to2Key, Blit1to3Key, Blit1to4Key
+static SDL_loblit one_blitkey[] = {
+ NULL, Blit1to1Key, Blit1to2Key, Blit1to3Key, Blit1to4Key
};
-SDL_BlitFunc
-SDL_CalculateBlit1(SDL_Surface * surface)
+SDL_loblit SDL_CalculateBlit1(SDL_Surface *surface, int blit_index)
{
- int which;
- SDL_PixelFormat *dstfmt;
-
- dstfmt = surface->map->dst->format;
- if (dstfmt->BitsPerPixel < 8) {
- which = 0;
- } else {
- which = dstfmt->BytesPerPixel;
- }
- switch (surface->map->info.flags & ~SDL_COPY_RLE_MASK) {
- case 0:
- return one_blit[which];
-
- case SDL_COPY_COLORKEY:
- return one_blitkey[which];
-
- case SDL_COPY_MODULATE_ALPHA | SDL_COPY_BLEND:
- /* Supporting 8bpp->8bpp alpha is doable but requires lots of
- tables which consume space and takes time to precompute,
- so is better left to the user */
- return which >= 2 ? Blit1toNAlpha : (SDL_BlitFunc) NULL;
-
- case SDL_COPY_COLORKEY | SDL_COPY_MODULATE_ALPHA | SDL_COPY_BLEND:
- return which >= 2 ? Blit1toNAlphaKey : (SDL_BlitFunc) NULL;
- }
- return (SDL_BlitFunc) NULL;
+ int which;
+ SDL_PixelFormat *dstfmt;
+
+ dstfmt = surface->map->dst->format;
+ if ( dstfmt->BitsPerPixel < 8 ) {
+ which = 0;
+ } else {
+ which = dstfmt->BytesPerPixel;
+ }
+ switch(blit_index) {
+ case 0: /* copy */
+ return one_blit[which];
+
+ case 1: /* colorkey */
+ return one_blitkey[which];
+
+ case 2: /* alpha */
+ /* Supporting 8bpp->8bpp alpha is doable but requires lots of
+ tables which consume space and takes time to precompute,
+ so is better left to the user */
+ return which >= 2 ? Blit1toNAlpha : NULL;
+
+ case 3: /* alpha + colorkey */
+ return which >= 2 ? Blit1toNAlphaKey : NULL;
+
+ }
+ return NULL;
}
-
-/* vi: set ts=4 sw=4 expandtab: */
projects / platform / upstream / SDL.git / blobdiff