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Diffstat (limited to 'distrib/sdl-1.2.15/src/video/SDL_blit_1.c')
-rw-r--r--distrib/sdl-1.2.15/src/video/SDL_blit_1.c523
1 files changed, 523 insertions, 0 deletions
diff --git a/distrib/sdl-1.2.15/src/video/SDL_blit_1.c b/distrib/sdl-1.2.15/src/video/SDL_blit_1.c
new file mode 100644
index 0000000..7f95f5b
--- /dev/null
+++ b/distrib/sdl-1.2.15/src/video/SDL_blit_1.c
@@ -0,0 +1,523 @@
+/*
+ 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_config.h"
+
+#include "SDL_video.h"
+#include "SDL_blit.h"
+#include "SDL_sysvideo.h"
+#include "SDL_endian.h"
+
+/* Functions to blit from 8-bit surfaces to other surfaces */
+
+static void Blit1to1(SDL_BlitInfo *info)
+{
+#ifndef USE_DUFFS_LOOP
+ int c;
+#endif
+ 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
+ DUFFS_LOOP(
+ {
+ *dst = map[*src];
+ }
+ dst++;
+ src++;
+ , width);
+#else
+ for ( c=width; c; --c ) {
+ *dst = map[*src];
+ dst++;
+ src++;
+ }
+#endif
+ src += srcskip;
+ dst += dstskip;
+ }
+}
+/* This is now endian dependent */
+#if ( SDL_BYTEORDER == SDL_LIL_ENDIAN )
+#define HI 1
+#define LO 0
+#else /* ( SDL_BYTEORDER == SDL_BIG_ENDIAN ) */
+#define HI 0
+#define LO 1
+#endif
+static void Blit1to2(SDL_BlitInfo *info)
+{
+#ifndef USE_DUFFS_LOOP
+ int c;
+#endif
+ 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-- ) {
+ DUFFS_LOOP(
+ {
+ *(Uint16 *)dst = map[*src++];
+ dst += 2;
+ },
+ width);
+ 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;
+ }
+ }
+#endif /* USE_DUFFS_LOOP */
+}
+static void Blit1to3(SDL_BlitInfo *info)
+{
+#ifndef USE_DUFFS_LOOP
+ int c;
+#endif
+ 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
+ DUFFS_LOOP(
+ {
+ o = *src * 4;
+ dst[0] = map[o++];
+ dst[1] = map[o++];
+ dst[2] = map[o++];
+ }
+ src++;
+ dst += 3;
+ , width);
+#else
+ 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;
+ }
+}
+static void Blit1to4(SDL_BlitInfo *info)
+{
+#ifndef USE_DUFFS_LOOP
+ int c;
+#endif
+ 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
+ DUFFS_LOOP(
+ *dst++ = map[*src++];
+ , width);
+#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++];
+ }
+#endif /* USE_DUFFS_LOOP */
+ src += srcskip;
+ dst += dstskip;
+ }
+}
+
+static void Blit1to1Key(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;
+ Uint32 ckey = info->src->colorkey;
+
+ if ( palmap ) {
+ while ( height-- ) {
+ DUFFS_LOOP(
+ {
+ if ( *src != ckey ) {
+ *dst = palmap[*src];
+ }
+ dst++;
+ src++;
+ },
+ width);
+ src += srcskip;
+ dst += dstskip;
+ }
+ } else {
+ while ( height-- ) {
+ DUFFS_LOOP(
+ {
+ if ( *src != ckey ) {
+ *dst = *src;
+ }
+ dst++;
+ src++;
+ },
+ width);
+ src += srcskip;
+ dst += dstskip;
+ }
+ }
+}
+
+static void Blit1to2Key(SDL_BlitInfo *info)
+{
+ 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=palmap[*src];
+ }
+ src++;
+ dstp++;
+ },
+ width);
+ src += srcskip;
+ dstp += dstskip;
+ }
+}
+
+static void Blit1to3Key(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;
+ Uint32 ckey = info->src->colorkey;
+ int o;
+
+ while ( height-- ) {
+ DUFFS_LOOP(
+ {
+ if ( *src != ckey ) {
+ o = *src * 4;
+ dst[0] = palmap[o++];
+ dst[1] = palmap[o++];
+ dst[2] = palmap[o++];
+ }
+ src++;
+ dst += 3;
+ },
+ width);
+ src += srcskip;
+ dst += dstskip;
+ }
+}
+
+static void Blit1to4Key(SDL_BlitInfo *info)
+{
+ 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 = palmap[*src];
+ }
+ src++;
+ dstp++;
+ },
+ width);
+ src += srcskip;
+ dstp += dstskip;
+ }
+}
+
+static void Blit1toNAlpha(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;
+ 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)
+{
+ 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_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 SDL_loblit one_blit[] = {
+ NULL, Blit1to1, Blit1to2, Blit1to3, Blit1to4
+};
+
+static SDL_loblit one_blitkey[] = {
+ NULL, Blit1to1Key, Blit1to2Key, Blit1to3Key, Blit1to4Key
+};
+
+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(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;
+}
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