0,0 → 1,437 |
/* |
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. |
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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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#ifdef SAVE_RCSID |
static char rcsid = |
"@(#) $Id: SDL_blit.h,v 1.3 2001/07/07 20:20:16 hercules Exp $"; |
#endif |
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#ifndef _SDL_blit_h |
#define _SDL_blit_h |
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#include "SDL_endian.h" |
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/* The structure passed to the low level blit functions */ |
typedef struct { |
Uint8 *s_pixels; |
int s_width; |
int s_height; |
int s_skip; |
Uint8 *d_pixels; |
int d_width; |
int d_height; |
int d_skip; |
void *aux_data; |
SDL_PixelFormat *src; |
Uint8 *table; |
SDL_PixelFormat *dst; |
} SDL_BlitInfo; |
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/* The type definition for the low level blit functions */ |
typedef void (*SDL_loblit)(SDL_BlitInfo *info); |
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/* This is the private info structure for software accelerated blits */ |
struct private_swaccel { |
SDL_loblit blit; |
void *aux_data; |
}; |
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/* Blit mapping definition */ |
typedef struct SDL_BlitMap { |
SDL_Surface *dst; |
int identity; |
Uint8 *table; |
SDL_blit hw_blit; |
SDL_blit sw_blit; |
struct private_hwaccel *hw_data; |
struct private_swaccel *sw_data; |
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/* the version count matches the destination; mismatch indicates |
an invalid mapping */ |
unsigned int format_version; |
} SDL_BlitMap; |
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/* Definitions for special global blit functions */ |
#include "SDL_blit_A.h" |
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/* Functions found in SDL_blit.c */ |
extern int SDL_CalculateBlit(SDL_Surface *surface); |
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/* Functions found in SDL_blit_{0,1,N,A}.c */ |
extern SDL_loblit SDL_CalculateBlit0(SDL_Surface *surface, int complex); |
extern SDL_loblit SDL_CalculateBlit1(SDL_Surface *surface, int complex); |
extern SDL_loblit SDL_CalculateBlitN(SDL_Surface *surface, int complex); |
extern SDL_loblit SDL_CalculateAlphaBlit(SDL_Surface *surface, int complex); |
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/* |
* Useful macros for blitting routines |
*/ |
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#define FORMAT_EQUAL(A, B) \ |
((A)->BitsPerPixel == (B)->BitsPerPixel \ |
&& ((A)->Rmask == (B)->Rmask) && ((A)->Amask == (B)->Amask)) |
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/* Load pixel of the specified format from a buffer and get its R-G-B values */ |
/* FIXME: rescale values to 0..255 here? */ |
#define RGB_FROM_PIXEL(pixel, fmt, r, g, b) \ |
{ \ |
r = (((pixel&fmt->Rmask)>>fmt->Rshift)<<fmt->Rloss); \ |
g = (((pixel&fmt->Gmask)>>fmt->Gshift)<<fmt->Gloss); \ |
b = (((pixel&fmt->Bmask)>>fmt->Bshift)<<fmt->Bloss); \ |
} |
#define RGB_FROM_RGB565(pixel, r, g, b) \ |
{ \ |
r = (((pixel&0xF800)>>11)<<3); \ |
g = (((pixel&0x07E0)>>5)<<2); \ |
b = ((pixel&0x001F)<<3); \ |
} |
#define RGB_FROM_RGB555(pixel, r, g, b) \ |
{ \ |
r = (((pixel&0x7C00)>>10)<<3); \ |
g = (((pixel&0x03E0)>>5)<<3); \ |
b = ((pixel&0x001F)<<3); \ |
} |
#define RGB_FROM_RGB888(pixel, r, g, b) \ |
{ \ |
r = ((pixel&0xFF0000)>>16); \ |
g = ((pixel&0xFF00)>>8); \ |
b = (pixel&0xFF); \ |
} |
#define RETRIEVE_RGB_PIXEL(buf, bpp, pixel) \ |
do { \ |
switch (bpp) { \ |
case 2: \ |
pixel = *((Uint16 *)(buf)); \ |
break; \ |
\ |
case 3: { \ |
Uint8 *B = (Uint8 *)(buf); \ |
if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ |
pixel = B[0] + (B[1] << 8) + (B[2] << 16); \ |
} else { \ |
pixel = (B[0] << 16) + (B[1] << 8) + B[2]; \ |
} \ |
} \ |
break; \ |
\ |
case 4: \ |
pixel = *((Uint32 *)(buf)); \ |
break; \ |
\ |
default: \ |
pixel = 0; /* appease gcc */ \ |
break; \ |
} \ |
} while(0) |
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#define DISEMBLE_RGB(buf, bpp, fmt, pixel, r, g, b) \ |
do { \ |
switch (bpp) { \ |
case 2: \ |
pixel = *((Uint16 *)(buf)); \ |
break; \ |
\ |
case 3: { \ |
Uint8 *B = (Uint8 *)buf; \ |
if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ |
pixel = B[0] + (B[1] << 8) + (B[2] << 16); \ |
} else { \ |
pixel = (B[0] << 16) + (B[1] << 8) + B[2]; \ |
} \ |
} \ |
break; \ |
\ |
case 4: \ |
pixel = *((Uint32 *)(buf)); \ |
break; \ |
\ |
default: \ |
pixel = 0; /* prevent gcc from complaining */ \ |
break; \ |
} \ |
RGB_FROM_PIXEL(pixel, fmt, r, g, b); \ |
} while(0) |
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/* Assemble R-G-B values into a specified pixel format and store them */ |
#define PIXEL_FROM_RGB(pixel, fmt, r, g, b) \ |
{ \ |
pixel = ((r>>fmt->Rloss)<<fmt->Rshift)| \ |
((g>>fmt->Gloss)<<fmt->Gshift)| \ |
((b>>fmt->Bloss)<<fmt->Bshift); \ |
} |
#define RGB565_FROM_RGB(pixel, r, g, b) \ |
{ \ |
pixel = ((r>>3)<<11)|((g>>2)<<5)|(b>>3); \ |
} |
#define RGB555_FROM_RGB(pixel, r, g, b) \ |
{ \ |
pixel = ((r>>3)<<10)|((g>>3)<<5)|(b>>3); \ |
} |
#define RGB888_FROM_RGB(pixel, r, g, b) \ |
{ \ |
pixel = (r<<16)|(g<<8)|b; \ |
} |
#define ASSEMBLE_RGB(buf, bpp, fmt, r, g, b) \ |
{ \ |
switch (bpp) { \ |
case 2: { \ |
Uint16 pixel; \ |
\ |
PIXEL_FROM_RGB(pixel, fmt, r, g, b); \ |
*((Uint16 *)(buf)) = pixel; \ |
} \ |
break; \ |
\ |
case 3: { \ |
if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ |
*((buf)+fmt->Rshift/8) = r; \ |
*((buf)+fmt->Gshift/8) = g; \ |
*((buf)+fmt->Bshift/8) = b; \ |
} else { \ |
*((buf)+2-fmt->Rshift/8) = r; \ |
*((buf)+2-fmt->Gshift/8) = g; \ |
*((buf)+2-fmt->Bshift/8) = b; \ |
} \ |
} \ |
break; \ |
\ |
case 4: { \ |
Uint32 pixel; \ |
\ |
PIXEL_FROM_RGB(pixel, fmt, r, g, b); \ |
*((Uint32 *)(buf)) = pixel; \ |
} \ |
break; \ |
} \ |
} |
#define ASSEMBLE_RGB_AMASK(buf, bpp, fmt, r, g, b, Amask) \ |
{ \ |
switch (bpp) { \ |
case 2: { \ |
Uint16 *bufp; \ |
Uint16 pixel; \ |
\ |
bufp = (Uint16 *)buf; \ |
PIXEL_FROM_RGB(pixel, fmt, r, g, b); \ |
*bufp = pixel | (*bufp & Amask); \ |
} \ |
break; \ |
\ |
case 3: { \ |
if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ |
*((buf)+fmt->Rshift/8) = r; \ |
*((buf)+fmt->Gshift/8) = g; \ |
*((buf)+fmt->Bshift/8) = b; \ |
} else { \ |
*((buf)+2-fmt->Rshift/8) = r; \ |
*((buf)+2-fmt->Gshift/8) = g; \ |
*((buf)+2-fmt->Bshift/8) = b; \ |
} \ |
} \ |
break; \ |
\ |
case 4: { \ |
Uint32 *bufp; \ |
Uint32 pixel; \ |
\ |
bufp = (Uint32 *)buf; \ |
PIXEL_FROM_RGB(pixel, fmt, r, g, b); \ |
*bufp = pixel | (*bufp & Amask); \ |
} \ |
break; \ |
} \ |
} |
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/* FIXME: Should we rescale alpha into 0..255 here? */ |
#define RGBA_FROM_PIXEL(pixel, fmt, r, g, b, a) \ |
{ \ |
r = ((pixel&fmt->Rmask)>>fmt->Rshift)<<fmt->Rloss; \ |
g = ((pixel&fmt->Gmask)>>fmt->Gshift)<<fmt->Gloss; \ |
b = ((pixel&fmt->Bmask)>>fmt->Bshift)<<fmt->Bloss; \ |
a = ((pixel&fmt->Amask)>>fmt->Ashift)<<fmt->Aloss; \ |
} |
#define RGBA_FROM_8888(pixel, fmt, r, g, b, a) \ |
{ \ |
r = (pixel&fmt->Rmask)>>fmt->Rshift; \ |
g = (pixel&fmt->Gmask)>>fmt->Gshift; \ |
b = (pixel&fmt->Bmask)>>fmt->Bshift; \ |
a = (pixel&fmt->Amask)>>fmt->Ashift; \ |
} |
#define RGBA_FROM_RGBA8888(pixel, r, g, b, a) \ |
{ \ |
r = (pixel>>24); \ |
g = ((pixel>>16)&0xFF); \ |
b = ((pixel>>8)&0xFF); \ |
a = (pixel&0xFF); \ |
} |
#define RGBA_FROM_ARGB8888(pixel, r, g, b, a) \ |
{ \ |
r = ((pixel>>16)&0xFF); \ |
g = ((pixel>>8)&0xFF); \ |
b = (pixel&0xFF); \ |
a = (pixel>>24); \ |
} |
#define RGBA_FROM_ABGR8888(pixel, r, g, b, a) \ |
{ \ |
r = (pixel&0xFF); \ |
g = ((pixel>>8)&0xFF); \ |
b = ((pixel>>16)&0xFF); \ |
a = (pixel>>24); \ |
} |
#define DISEMBLE_RGBA(buf, bpp, fmt, pixel, r, g, b, a) \ |
do { \ |
switch (bpp) { \ |
case 2: \ |
pixel = *((Uint16 *)(buf)); \ |
break; \ |
\ |
case 3: {/* FIXME: broken code (no alpha) */ \ |
Uint8 *b = (Uint8 *)buf; \ |
if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ |
pixel = b[0] + (b[1] << 8) + (b[2] << 16); \ |
} else { \ |
pixel = (b[0] << 16) + (b[1] << 8) + b[2]; \ |
} \ |
} \ |
break; \ |
\ |
case 4: \ |
pixel = *((Uint32 *)(buf)); \ |
break; \ |
\ |
default: \ |
pixel = 0; /* stop gcc complaints */ \ |
break; \ |
} \ |
RGBA_FROM_PIXEL(pixel, fmt, r, g, b, a); \ |
pixel &= ~fmt->Amask; \ |
} while(0) |
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/* FIXME: this isn't correct, especially for Alpha (maximum != 255) */ |
#define PIXEL_FROM_RGBA(pixel, fmt, r, g, b, a) \ |
{ \ |
pixel = ((r>>fmt->Rloss)<<fmt->Rshift)| \ |
((g>>fmt->Gloss)<<fmt->Gshift)| \ |
((b>>fmt->Bloss)<<fmt->Bshift)| \ |
((a<<fmt->Aloss)<<fmt->Ashift); \ |
} |
#define ASSEMBLE_RGBA(buf, bpp, fmt, r, g, b, a) \ |
{ \ |
switch (bpp) { \ |
case 2: { \ |
Uint16 pixel; \ |
\ |
PIXEL_FROM_RGBA(pixel, fmt, r, g, b, a); \ |
*((Uint16 *)(buf)) = pixel; \ |
} \ |
break; \ |
\ |
case 3: { /* FIXME: broken code (no alpha) */ \ |
if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \ |
*((buf)+fmt->Rshift/8) = r; \ |
*((buf)+fmt->Gshift/8) = g; \ |
*((buf)+fmt->Bshift/8) = b; \ |
} else { \ |
*((buf)+2-fmt->Rshift/8) = r; \ |
*((buf)+2-fmt->Gshift/8) = g; \ |
*((buf)+2-fmt->Bshift/8) = b; \ |
} \ |
} \ |
break; \ |
\ |
case 4: { \ |
Uint32 pixel; \ |
\ |
PIXEL_FROM_RGBA(pixel, fmt, r, g, b, a); \ |
*((Uint32 *)(buf)) = pixel; \ |
} \ |
break; \ |
} \ |
} |
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/* Blend the RGB values of two pixels based on a source alpha value */ |
#define ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB) \ |
do { \ |
dR = (((sR-dR)*(A))>>8)+dR; \ |
dG = (((sG-dG)*(A))>>8)+dG; \ |
dB = (((sB-dB)*(A))>>8)+dB; \ |
} while(0) |
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/* This is a very useful loop for optimizing blitters */ |
#define USE_DUFFS_LOOP |
#ifdef USE_DUFFS_LOOP |
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/* 8-times unrolled loop */ |
#define DUFFS_LOOP8(pixel_copy_increment, width) \ |
{ int n = (width+7)/8; \ |
switch (width & 7) { \ |
case 0: do { pixel_copy_increment; \ |
case 7: pixel_copy_increment; \ |
case 6: pixel_copy_increment; \ |
case 5: pixel_copy_increment; \ |
case 4: pixel_copy_increment; \ |
case 3: pixel_copy_increment; \ |
case 2: pixel_copy_increment; \ |
case 1: pixel_copy_increment; \ |
} while ( --n > 0 ); \ |
} \ |
} |
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/* 4-times unrolled loop */ |
#define DUFFS_LOOP4(pixel_copy_increment, width) \ |
{ int n = (width+3)/4; \ |
switch (width & 3) { \ |
case 0: do { pixel_copy_increment; \ |
case 3: pixel_copy_increment; \ |
case 2: pixel_copy_increment; \ |
case 1: pixel_copy_increment; \ |
} while ( --n > 0 ); \ |
} \ |
} |
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/* Use the 8-times version of the loop by default */ |
#define DUFFS_LOOP(pixel_copy_increment, width) \ |
DUFFS_LOOP8(pixel_copy_increment, width) |
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#else |
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/* Don't use Duff's device to unroll loops */ |
#define DUFFS_LOOP(pixel_copy_increment, width) \ |
{ int n; \ |
for ( n=width; n > 0; --n ) { \ |
pixel_copy_increment; \ |
} \ |
} |
#define DUFFS_LOOP8(pixel_copy_increment, width) \ |
DUFFS_LOOP(pixel_copy_increment, width) |
#define DUFFS_LOOP4(pixel_copy_increment, width) \ |
DUFFS_LOOP(pixel_copy_increment, width) |
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#endif /* USE_DUFFS_LOOP */ |
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/* Prevent Visual C++ 6.0 from printing out stupid warnings */ |
#if defined(_MSC_VER) && (_MSC_VER >= 600) |
#pragma warning(disable: 4550) |
#endif |
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#endif /* _SDL_blit_h */ |