Mercurial > sdl-ios-xcode
view src/video/SDL_blit_1.c @ 1614:6162b8d921ce
Date: Wed, 29 Mar 2006 17:26:55 +0200 CEST
From: "Fran���is Revol"
Subject: [SDL] BeOS port fix: PrintScreen key crashing
It seems the latest SDL crashes when someone hits the PrtScrn key in
ZETA (BeOS R6), somewhere it gets a negative value as key code (or a
big unsigned maybe ?), and uses it as an index in the keysym table...
I'll investigate the cause for the negative value, but it's always
better to check for bounds correctly when indexing a table. The
attached diff fixes it.
Fran���is Revol
--
Software Architect
yellowTAB GmbH
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Fri, 31 Mar 2006 06:16:20 +0000 |
parents | d910939febfa |
children | 782fd950bd46 c121d94672cb a1b03ba2fcd0 |
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/* SDL - Simple DirectMedia Layer Copyright (C) 1997-2006 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; }