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Diffstat (limited to 'src/video/SDL_blit_0.c')
-rw-r--r--src/video/SDL_blit_0.c471
1 files changed, 471 insertions, 0 deletions
diff --git a/src/video/SDL_blit_0.c b/src/video/SDL_blit_0.c
new file mode 100644
index 0000000..26b60ac
--- /dev/null
+++ b/src/video/SDL_blit_0.c
@@ -0,0 +1,471 @@
+/*
+ SDL - Simple DirectMedia Layer
+ Copyright (C) 1997-2009 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"
+
+/* Functions to blit from bitmaps to other surfaces */
+
+static void BlitBto1(SDL_BlitInfo *info)
+{
+ int c;
+ 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;
+ srcskip += width-(width+7)/8;
+
+ if ( map ) {
+ while ( height-- ) {
+ Uint8 byte = 0, bit;
+ for ( c=0; c<width; ++c ) {
+ if ( (c&7) == 0 ) {
+ byte = *src++;
+ }
+ bit = (byte&0x80)>>7;
+ if ( 1 ) {
+ *dst = map[bit];
+ }
+ dst++;
+ byte <<= 1;
+ }
+ src += srcskip;
+ dst += dstskip;
+ }
+ } else {
+ while ( height-- ) {
+ Uint8 byte = 0, bit;
+ for ( c=0; c<width; ++c ) {
+ if ( (c&7) == 0 ) {
+ byte = *src++;
+ }
+ bit = (byte&0x80)>>7;
+ if ( 1 ) {
+ *dst = bit;
+ }
+ dst++;
+ byte <<= 1;
+ }
+ src += srcskip;
+ dst += dstskip;
+ }
+ }
+}
+static void BlitBto2(SDL_BlitInfo *info)
+{
+ int c;
+ int width, height;
+ Uint8 *src;
+ Uint16 *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 = (Uint16 *)info->d_pixels;
+ dstskip = info->d_skip/2;
+ map = (Uint16 *)info->table;
+ srcskip += width-(width+7)/8;
+
+ while ( height-- ) {
+ Uint8 byte = 0, bit;
+ for ( c=0; c<width; ++c ) {
+ if ( (c&7) == 0 ) {
+ byte = *src++;
+ }
+ bit = (byte&0x80)>>7;
+ if ( 1 ) {
+ *dst = map[bit];
+ }
+ byte <<= 1;
+ dst++;
+ }
+ src += srcskip;
+ dst += dstskip;
+ }
+}
+static void BlitBto3(SDL_BlitInfo *info)
+{
+ int c, 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;
+ srcskip += width-(width+7)/8;
+
+ while ( height-- ) {
+ Uint8 byte = 0, bit;
+ for ( c=0; c<width; ++c ) {
+ if ( (c&7) == 0 ) {
+ byte = *src++;
+ }
+ bit = (byte&0x80)>>7;
+ if ( 1 ) {
+ o = bit * 4;
+ dst[0] = map[o++];
+ dst[1] = map[o++];
+ dst[2] = map[o++];
+ }
+ byte <<= 1;
+ dst += 3;
+ }
+ src += srcskip;
+ dst += dstskip;
+ }
+}
+static void BlitBto4(SDL_BlitInfo *info)
+{
+ int width, height;
+ Uint8 *src;
+ Uint32 *map, *dst;
+ int srcskip, dstskip;
+ int c;
+
+ /* 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;
+ srcskip += width-(width+7)/8;
+
+ while ( height-- ) {
+ Uint8 byte = 0, bit;
+ for ( c=0; c<width; ++c ) {
+ if ( (c&7) == 0 ) {
+ byte = *src++;
+ }
+ bit = (byte&0x80)>>7;
+ if ( 1 ) {
+ *dst = map[bit];
+ }
+ byte <<= 1;
+ dst++;
+ }
+ src += srcskip;
+ dst += dstskip;
+ }
+}
+
+static void BlitBto1Key(SDL_BlitInfo *info)
+{
+ int width = info->d_width;
+ int height = info->d_height;
+ Uint8 *src = info->s_pixels;
+ Uint8 *dst = info->d_pixels;
+ int srcskip = info->s_skip;
+ int dstskip = info->d_skip;
+ Uint32 ckey = info->src->colorkey;
+ Uint8 *palmap = info->table;
+ int c;
+
+ /* Set up some basic variables */
+ srcskip += width-(width+7)/8;
+
+ if ( palmap ) {
+ while ( height-- ) {
+ Uint8 byte = 0, bit;
+ for ( c=0; c<width; ++c ) {
+ if ( (c&7) == 0 ) {
+ byte = *src++;
+ }
+ bit = (byte&0x80)>>7;
+ if ( bit != ckey ) {
+ *dst = palmap[bit];
+ }
+ dst++;
+ byte <<= 1;
+ }
+ src += srcskip;
+ dst += dstskip;
+ }
+ } else {
+ while ( height-- ) {
+ Uint8 byte = 0, bit;
+ for ( c=0; c<width; ++c ) {
+ if ( (c&7) == 0 ) {
+ byte = *src++;
+ }
+ bit = (byte&0x80)>>7;
+ if ( bit != ckey ) {
+ *dst = bit;
+ }
+ dst++;
+ byte <<= 1;
+ }
+ src += srcskip;
+ dst += dstskip;
+ }
+ }
+}
+
+static void BlitBto2Key(SDL_BlitInfo *info)
+{
+ int width = info->d_width;
+ int height = info->d_height;
+ Uint8 *src = info->s_pixels;
+ Uint16 *dstp = (Uint16 *)info->d_pixels;
+ int srcskip = info->s_skip;
+ int dstskip = info->d_skip;
+ Uint32 ckey = info->src->colorkey;
+ Uint8 *palmap = info->table;
+ int c;
+
+ /* Set up some basic variables */
+ srcskip += width-(width+7)/8;
+ dstskip /= 2;
+
+ while ( height-- ) {
+ Uint8 byte = 0, bit;
+ for ( c=0; c<width; ++c ) {
+ if ( (c&7) == 0 ) {
+ byte = *src++;
+ }
+ bit = (byte&0x80)>>7;
+ if ( bit != ckey ) {
+ *dstp=((Uint16 *)palmap)[bit];
+ }
+ byte <<= 1;
+ dstp++;
+ }
+ src += srcskip;
+ dstp += dstskip;
+ }
+}
+
+static void BlitBto3Key(SDL_BlitInfo *info)
+{
+ int width = info->d_width;
+ int height = info->d_height;
+ Uint8 *src = info->s_pixels;
+ Uint8 *dst = info->d_pixels;
+ int srcskip = info->s_skip;
+ int dstskip = info->d_skip;
+ Uint32 ckey = info->src->colorkey;
+ Uint8 *palmap = info->table;
+ int c;
+
+ /* Set up some basic variables */
+ srcskip += width-(width+7)/8;
+
+ while ( height-- ) {
+ Uint8 byte = 0, bit;
+ for ( c=0; c<width; ++c ) {
+ if ( (c&7) == 0 ) {
+ byte = *src++;
+ }
+ bit = (byte&0x80)>>7;
+ if ( bit != ckey ) {
+ SDL_memcpy(dst, &palmap[bit*4], 3);
+ }
+ byte <<= 1;
+ dst += 3;
+ }
+ src += srcskip;
+ dst += dstskip;
+ }
+}
+
+static void BlitBto4Key(SDL_BlitInfo *info)
+{
+ int width = info->d_width;
+ int height = info->d_height;
+ Uint8 *src = info->s_pixels;
+ Uint32 *dstp = (Uint32 *)info->d_pixels;
+ int srcskip = info->s_skip;
+ int dstskip = info->d_skip;
+ Uint32 ckey = info->src->colorkey;
+ Uint8 *palmap = info->table;
+ int c;
+
+ /* Set up some basic variables */
+ srcskip += width-(width+7)/8;
+ dstskip /= 4;
+
+ while ( height-- ) {
+ Uint8 byte = 0, bit;
+ for ( c=0; c<width; ++c ) {
+ if ( (c&7) == 0 ) {
+ byte = *src++;
+ }
+ bit = (byte&0x80)>>7;
+ if ( bit != ckey ) {
+ *dstp=((Uint32 *)palmap)[bit];
+ }
+ byte <<= 1;
+ dstp++;
+ }
+ src += srcskip;
+ dstp += dstskip;
+ }
+}
+
+static void BlitBtoNAlpha(SDL_BlitInfo *info)
+{
+ int width = info->d_width;
+ int height = info->d_height;
+ Uint8 *src = info->s_pixels;
+ Uint8 *dst = info->d_pixels;
+ int srcskip = info->s_skip;
+ int dstskip = info->d_skip;
+ const SDL_Color *srcpal = info->src->palette->colors;
+ SDL_PixelFormat *dstfmt = info->dst;
+ int dstbpp;
+ int c;
+ const int A = info->src->alpha;
+
+ /* Set up some basic variables */
+ dstbpp = dstfmt->BytesPerPixel;
+ srcskip += width-(width+7)/8;
+
+ while ( height-- ) {
+ Uint8 byte = 0, bit;
+ for ( c=0; c<width; ++c ) {
+ if ( (c&7) == 0 ) {
+ byte = *src++;
+ }
+ bit = (byte&0x80)>>7;
+ if ( 1 ) {
+ Uint32 pixel;
+ unsigned sR, sG, sB;
+ unsigned dR, dG, dB;
+ sR = srcpal[bit].r;
+ sG = srcpal[bit].g;
+ sB = srcpal[bit].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);
+ }
+ byte <<= 1;
+ dst += dstbpp;
+ }
+ src += srcskip;
+ dst += dstskip;
+ }
+}
+
+static void BlitBtoNAlphaKey(SDL_BlitInfo *info)
+{
+ int width = info->d_width;
+ int height = info->d_height;
+ Uint8 *src = info->s_pixels;
+ Uint8 *dst = info->d_pixels;
+ int srcskip = info->s_skip;
+ int dstskip = info->d_skip;
+ SDL_PixelFormat *srcfmt = info->src;
+ SDL_PixelFormat *dstfmt = info->dst;
+ const SDL_Color *srcpal = srcfmt->palette->colors;
+ int dstbpp;
+ int c;
+ const int A = srcfmt->alpha;
+ Uint32 ckey = srcfmt->colorkey;
+
+ /* Set up some basic variables */
+ dstbpp = dstfmt->BytesPerPixel;
+ srcskip += width-(width+7)/8;
+
+ while ( height-- ) {
+ Uint8 byte = 0, bit;
+ for ( c=0; c<width; ++c ) {
+ if ( (c&7) == 0 ) {
+ byte = *src++;
+ }
+ bit = (byte&0x80)>>7;
+ if ( bit != ckey ) {
+ int sR, sG, sB;
+ int dR, dG, dB;
+ Uint32 pixel;
+ sR = srcpal[bit].r;
+ sG = srcpal[bit].g;
+ sB = srcpal[bit].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);
+ }
+ byte <<= 1;
+ dst += dstbpp;
+ }
+ src += srcskip;
+ dst += dstskip;
+ }
+}
+
+static SDL_loblit bitmap_blit[] = {
+ NULL, BlitBto1, BlitBto2, BlitBto3, BlitBto4
+};
+
+static SDL_loblit colorkey_blit[] = {
+ NULL, BlitBto1Key, BlitBto2Key, BlitBto3Key, BlitBto4Key
+};
+
+SDL_loblit SDL_CalculateBlit0(SDL_Surface *surface, int blit_index)
+{
+ int which;
+
+ if ( surface->format->BitsPerPixel != 1 ) {
+ /* We don't support sub 8-bit packed pixel modes */
+ return NULL;
+ }
+ if ( surface->map->dst->format->BitsPerPixel < 8 ) {
+ which = 0;
+ } else {
+ which = surface->map->dst->format->BytesPerPixel;
+ }
+ switch(blit_index) {
+ case 0: /* copy */
+ return bitmap_blit[which];
+
+ case 1: /* colorkey */
+ return colorkey_blit[which];
+
+ case 2: /* alpha */
+ return which >= 2 ? BlitBtoNAlpha : NULL;
+
+ case 4: /* alpha + colorkey */
+ return which >= 2 ? BlitBtoNAlphaKey : NULL;
+ }
+ return NULL;
+}
+
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