| /* |
| 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; |
| } |
| |
