/*

SDL - Simple DirectMedia Layer

Copyright (C) 1997-2011 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"

#ifndef _SDL_blit_h

#define _SDL_blit_h

#include "SDL_cpuinfo.h"

#include "SDL_endian.h"

#include "SDL_surface.h"

/* SDL blit copy flags */

#define SDL_COPY_MODULATE_COLOR 0x00000001

#define SDL_COPY_MODULATE_ALPHA 0x00000002

#define SDL_COPY_BLEND 0x00000010

#define SDL_COPY_ADD 0x00000020

#define SDL_COPY_MOD 0x00000040

#define SDL_COPY_COLORKEY 0x00000100

#define SDL_COPY_NEAREST 0x00000200

#define SDL_COPY_RLE_DESIRED 0x00001000

#define SDL_COPY_RLE_COLORKEY 0x00002000

#define SDL_COPY_RLE_ALPHAKEY 0x00004000

#define SDL_COPY_RLE_MASK (SDL_COPY_RLE_DESIRED|SDL_COPY_RLE_COLORKEY|SDL_COPY_RLE_ALPHAKEY)

/* SDL blit CPU flags */

#define SDL_CPU_ANY 0x00000000

#define SDL_CPU_MMX 0x00000001

#define SDL_CPU_3DNOW 0x00000002

#define SDL_CPU_SSE 0x00000004

#define SDL_CPU_SSE2 0x00000008

#define SDL_CPU_ALTIVEC_PREFETCH 0x00000010

#define SDL_CPU_ALTIVEC_NOPREFETCH 0x00000020

typedef struct

{

Uint8 *src;

int src_w, src_h;

int src_pitch;

int src_skip;

Uint8 *dst;

int dst_w, dst_h;

int dst_pitch;

int dst_skip;

SDL_PixelFormat *src_fmt;

SDL_PixelFormat *dst_fmt;

Uint8 *table;

int flags;

Uint32 colorkey;

Uint8 r, g, b, a;

} SDL_BlitInfo;

typedef void (SDLCALL * SDL_BlitFunc) (SDL_BlitInfo * info);

typedef struct

{

Uint32 src_format;

Uint32 dst_format;

int flags;

int cpu;

SDL_BlitFunc func;

} SDL_BlitFuncEntry;

/* Blit mapping definition */

typedef struct SDL_BlitMap

} SDL_BlitMap;

/* Functions found in SDL_blit.c */

extern int SDL_CalculateBlit(SDL_Surface * surface);

/* Functions found in SDL_blit_*.c */

extern SDL_BlitFunc SDL_CalculateBlit0(SDL_Surface * surface);

extern SDL_BlitFunc SDL_CalculateBlit1(SDL_Surface * surface);

extern SDL_BlitFunc SDL_CalculateBlitN(SDL_Surface * surface);

extern SDL_BlitFunc SDL_CalculateBlitA(SDL_Surface * surface);

/*

* Useful macros for blitting routines

*/

#if defined(__GNUC__)

#define DECLARE_ALIGNED(t,v,a) t __attribute__((aligned(a))) v

#elif defined(_MSC_VER)

#define DECLARE_ALIGNED(t,v,a) __declspec(align(a)) t v

#else

#define DECLARE_ALIGNED(t,v,a) t v

#endif

/* 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; /* stop gcc complaints */ \

break; \

} \

} while (0)

#define DISEMBLE_RGB(buf, bpp, fmt, Pixel, r, g, b) \

do { \

switch (bpp) { \

case 2: \

Pixel = *((Uint16 *)(buf)); \

RGB_FROM_PIXEL(Pixel, fmt, r, g, b); \

break; \

\

case 3: { \

if (SDL_BYTEORDER == SDL_LIL_ENDIAN) { \

r = *((buf)+fmt->Rshift/8); \

g = *((buf)+fmt->Gshift/8); \

b = *((buf)+fmt->Bshift/8); \

} else { \

r = *((buf)+2-fmt->Rshift/8); \

g = *((buf)+2-fmt->Gshift/8); \

b = *((buf)+2-fmt->Bshift/8); \

} \

} \

break; \

\

case 4: \

Pixel = *((Uint32 *)(buf)); \

RGB_FROM_PIXEL(Pixel, fmt, r, g, b); \

break; \

\

default: \

Pixel; /* stop gcc complaints */ \

break; \

} \

} while (0)

/* 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 ARGB8888_FROM_RGBA(Pixel, r, g, b, a) \

{ \

Pixel = (a<<24)|(r<<16)|(g<<8)|b; \

}

#define RGBA8888_FROM_RGBA(Pixel, r, g, b, a) \

{ \

Pixel = (r<<24)|(g<<16)|(b<<8)|a; \

}

#define ABGR8888_FROM_RGBA(Pixel, r, g, b, a) \

{ \

Pixel = (a<<24)|(b<<16)|(g<<8)|r; \

}

#define BGRA8888_FROM_RGBA(Pixel, r, g, b, a) \

{ \

Pixel = (b<<24)|(g<<16)|(r<<8)|a; \

}

#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; \

} \

}

/* 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 RGBA_FROM_BGRA8888(Pixel, r, g, b, a) \

{ \

r = ((Pixel>>8)&0xFF); \

g = ((Pixel>>16)&0xFF); \

b = (Pixel>>24); \

a = (Pixel&0xFF); \

}

#define DISEMBLE_RGBA(buf, bpp, fmt, Pixel, r, g, b, a) \

do { \

switch (bpp) { \

case 2: \

Pixel = *((Uint16 *)(buf)); \

RGBA_FROM_PIXEL(Pixel, fmt, r, g, b, a); \

break; \

\

case 3: { \

if (SDL_BYTEORDER == SDL_LIL_ENDIAN) { \

r = *((buf)+fmt->Rshift/8); \

g = *((buf)+fmt->Gshift/8); \

b = *((buf)+fmt->Bshift/8); \

} else { \

r = *((buf)+2-fmt->Rshift/8); \

g = *((buf)+2-fmt->Gshift/8); \

b = *((buf)+2-fmt->Bshift/8); \

} \

a = 0xFF; \

} \

break; \

\

case 4: \

Pixel = *((Uint32 *)(buf)); \

RGBA_FROM_PIXEL(Pixel, fmt, r, g, b, a); \

break; \

\

default: \

Pixel; /* stop gcc complaints */ \

break; \

} \

} while (0)

/* 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: { \

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; \

} \

}

/* 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 = ((((int)(sR-dR)*(int)A)/255)+dR); \

dG = ((((int)(sG-dG)*(int)A)/255)+dG); \

dB = ((((int)(sB-dB)*(int)A)/255)+dB); \

} while(0)

/* This is a very useful loop for optimizing blitters */

#if defined(_MSC_VER) && (_MSC_VER == 1300)

/* There's a bug in the Visual C++ 7 optimizer when compiling this code */

#else

#define USE_DUFFS_LOOP

#endif

#ifdef USE_DUFFS_LOOP

/* 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 ); \

} \

}

/* 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); \

} \

}

/* Use the 8-times version of the loop by default */

#define DUFFS_LOOP(pixel_copy_increment, width) \

DUFFS_LOOP8(pixel_copy_increment, width)

/* Special version of Duff's device for even more optimization */

#define DUFFS_LOOP_124(pixel_copy_increment1, \

pixel_copy_increment2, \

pixel_copy_increment4, width) \

{ int n = width; \

if (n & 1) { \

pixel_copy_increment1; n -= 1; \

} \

if (n & 2) { \

pixel_copy_increment2; n -= 2; \

} \

if (n) { \

n = (n+7)/ 8; \

switch (n & 4) { \

case 0: do { pixel_copy_increment4; \

case 4: pixel_copy_increment4; \

} while (--n > 0); \

} \

} \

}

#else

/* 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)

#define DUFFS_LOOP_124(pixel_copy_increment1, \

pixel_copy_increment2, \

pixel_copy_increment4, width) \

DUFFS_LOOP(pixel_copy_increment1, width)

#endif /* USE_DUFFS_LOOP */

/* Prevent Visual C++ 6.0 from printing out stupid warnings */

#if defined(_MSC_VER) && (_MSC_VER >= 600)

#pragma warning(disable: 4550)

#endif

#endif /* _SDL_blit_h */

/* vi: set ts=4 sw=4 expandtab: */