524 lines
10 KiB
C
524 lines
10 KiB
C
/*
|
|
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;
|
|
}
|