0,0 → 1,471 |
/* |
SDL - Simple DirectMedia Layer |
Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga |
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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@devolution.com |
*/ |
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#include <stdio.h> |
#include <string.h> |
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#include "SDL_types.h" |
#include "SDL_video.h" |
#include "SDL_blit.h" |
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/* Functions to blit from bitmaps to other surfaces */ |
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static void BlitBto1(SDL_BlitInfo *info) |
{ |
int c; |
int width, height; |
Uint8 *src, *map, *dst; |
int srcskip, dstskip; |
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/* 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; |
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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; |
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/* 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; |
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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; |
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/* 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; |
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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; |
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/* 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; |
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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; |
} |
} |
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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; |
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/* Set up some basic variables */ |
srcskip += width-(width+7)/8; |
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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; |
} |
} |
} |
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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; |
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/* Set up some basic variables */ |
srcskip += width-(width+7)/8; |
dstskip /= 2; |
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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; |
} |
} |
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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; |
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/* Set up some basic variables */ |
srcskip += width-(width+7)/8; |
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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 ) { |
memcpy(dst, &palmap[bit*4], 3); |
} |
byte <<= 1; |
dst += 3; |
} |
src += srcskip; |
dst += dstskip; |
} |
} |
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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; |
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/* Set up some basic variables */ |
srcskip += width-(width+7)/8; |
dstskip /= 4; |
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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; |
} |
} |
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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; |
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/* Set up some basic variables */ |
dstbpp = dstfmt->BytesPerPixel; |
srcskip += width-(width+7)/8; |
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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; |
} |
} |
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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; |
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/* Set up some basic variables */ |
dstbpp = dstfmt->BytesPerPixel; |
srcskip += width-(width+7)/8; |
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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; |
} |
} |
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static SDL_loblit bitmap_blit[] = { |
NULL, BlitBto1, BlitBto2, BlitBto3, BlitBto4 |
}; |
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static SDL_loblit colorkey_blit[] = { |
NULL, BlitBto1Key, BlitBto2Key, BlitBto3Key, BlitBto4Key |
}; |
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SDL_loblit SDL_CalculateBlit0(SDL_Surface *surface, int blit_index) |
{ |
int which; |
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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]; |
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case 1: /* colorkey */ |
return colorkey_blit[which]; |
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case 2: /* alpha */ |
return which >= 2 ? BlitBtoNAlpha : NULL; |
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case 4: /* alpha + colorkey */ |
return which >= 2 ? BlitBtoNAlphaKey : NULL; |
} |
return NULL; |
} |
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