Mercurial > sdl-ios-xcode
view src/video/SDL_blit_1.c @ 1258:b2283b0ded26
Date: Thu, 19 Jan 2006 20:02:29 +0200
From: Vassilis Virvilis <vasvir@iit.demokritos.gr>
Subject: [SDL] Request: Please reconsider adding tag in SDL_Event
Hi,
Patch in question:
--- include/SDL_events.h 20 Aug 2004 18:57:01 -0000 1.11
+++ include/SDL_events.h 19 Jan 2006 17:35:09 -0000
@@ -214,7 +214,7 @@
} SDL_SysWMEvent;
/* General event structure */
-typedef union {
+typedef union SDL_Event {
Uint8 type;
SDL_ActiveEvent active;
SDL_KeyboardEvent key;
Reasoning:
----------
1) Allows forward declaration of the SDL_Event union in C++. Please
note that in plain C it is possible to forward declare it.
2) Forward declaration is good because it allows encapsulation. It hides
the specific implementation and does not necessarily exposes SDL staff
to my appication's namespace
3) It can't harm plain C because tags are living in a different namespace
than typenames
4) It is already done like this in other places in SDL. Check for example
SDL_KeySym, and SDL_.*Event structures.
5) Right now I have to include SDL/event.h from a C++ header file. See 2)
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Fri, 20 Jan 2006 13:07:25 +0000 |
parents | b8d311d90021 |
children | c9b51268668f |
line wrap: on
line source
/* SDL - Simple DirectMedia Layer Copyright (C) 1997-2004 Sam Lantinga 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@libsdl.org */ #ifdef SAVE_RCSID static char rcsid = "@(#) $Id$"; #endif #include <stdio.h> #include "SDL_types.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; }