Mercurial > sdl-ios-xcode
view src/video/SDL_blit.c @ 855:aa4ac9e65d92
I noticed MacOSX SDL sets up working directory to parent of executable.
On BeOS is should setup it the same way, but it only does when Tracker
wasn't restarted.
I checked code and it looks like a hack to me :(
It looks for env variable and than comapres it to default when OpenTracker
was started after boot, and wasn't restarted. That's probably ok, for that
exact case. Unfortunetly that variable isn't always like that. For
example, after Tracker crashes and is restarted, env variable most
probably is different (depends on how Tracker was restarted, by what
application, etc... for example: i have launcher application from which i
can restart Tracker, and after that nev variable points to that
application's directory, not Tracker's).
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Tue, 24 Feb 2004 18:58:40 +0000 |
parents | b8d311d90021 |
children | 9ef41050100c |
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/* 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 <stdlib.h> #include <string.h> #include "SDL_error.h" #include "SDL_video.h" #include "SDL_sysvideo.h" #include "SDL_blit.h" #include "SDL_RLEaccel_c.h" #include "SDL_pixels_c.h" #include "SDL_memops.h" #if defined(i386) && defined(__GNUC__) && defined(USE_ASMBLIT) #include "SDL_cpuinfo.h" #include "mmx.h" #endif /* The general purpose software blit routine */ static int SDL_SoftBlit(SDL_Surface *src, SDL_Rect *srcrect, SDL_Surface *dst, SDL_Rect *dstrect) { int okay; int src_locked; int dst_locked; /* Everything is okay at the beginning... */ okay = 1; /* Lock the destination if it's in hardware */ dst_locked = 0; if ( SDL_MUSTLOCK(dst) ) { if ( SDL_LockSurface(dst) < 0 ) { okay = 0; } else { dst_locked = 1; } } /* Lock the source if it's in hardware */ src_locked = 0; if ( SDL_MUSTLOCK(src) ) { if ( SDL_LockSurface(src) < 0 ) { okay = 0; } else { src_locked = 1; } } /* Set up source and destination buffer pointers, and BLIT! */ if ( okay && srcrect->w && srcrect->h ) { SDL_BlitInfo info; SDL_loblit RunBlit; /* Set up the blit information */ info.s_pixels = (Uint8 *)src->pixels + (Uint16)srcrect->y*src->pitch + (Uint16)srcrect->x*src->format->BytesPerPixel; info.s_width = srcrect->w; info.s_height = srcrect->h; info.s_skip=src->pitch-info.s_width*src->format->BytesPerPixel; info.d_pixels = (Uint8 *)dst->pixels + (Uint16)dstrect->y*dst->pitch + (Uint16)dstrect->x*dst->format->BytesPerPixel; info.d_width = dstrect->w; info.d_height = dstrect->h; info.d_skip=dst->pitch-info.d_width*dst->format->BytesPerPixel; info.aux_data = src->map->sw_data->aux_data; info.src = src->format; info.table = src->map->table; info.dst = dst->format; RunBlit = src->map->sw_data->blit; /* Run the actual software blit */ RunBlit(&info); } /* We need to unlock the surfaces if they're locked */ if ( dst_locked ) { SDL_UnlockSurface(dst); } if ( src_locked ) { SDL_UnlockSurface(src); } /* Blit is done! */ return(okay ? 0 : -1); } #if defined(i386) && defined(__GNUC__) && defined(USE_ASMBLIT) void SDL_memcpyMMX(char* to,char* from,int len) { int i; for(i=0; i<len/8; i++) { __asm__ __volatile__ ( " movq (%0), %%mm0\n" " movq %%mm0, (%1)\n" : : "r" (from), "r" (to) : "memory"); from+=8; to+=8; } if (len&7) SDL_memcpy(to, from, len&7); } void SDL_memcpySSE(char* to,char* from,int len) { int i; __asm__ __volatile__ ( " prefetchnta (%0)\n" " prefetchnta 64(%0)\n" " prefetchnta 128(%0)\n" " prefetchnta 192(%0)\n" : : "r" (from) ); for(i=0; i<len/8; i++) { __asm__ __volatile__ ( " prefetchnta 256(%0)\n" " movq (%0), %%mm0\n" " movntq %%mm0, (%1)\n" : : "r" (from), "r" (to) : "memory"); from+=8; to+=8; } if (len&7) SDL_memcpy(to, from, len&7); } #endif static void SDL_BlitCopy(SDL_BlitInfo *info) { Uint8 *src, *dst; int w, h; int srcskip, dstskip; w = info->d_width*info->dst->BytesPerPixel; h = info->d_height; src = info->s_pixels; dst = info->d_pixels; srcskip = w+info->s_skip; dstskip = w+info->d_skip; #if defined(i386) && defined(__GNUC__) && defined(USE_ASMBLIT) if(SDL_HasSSE()) { while ( h-- ) { SDL_memcpySSE(dst, src, w); src += srcskip; dst += dstskip; } __asm__ __volatile__ ( " emms\n" ::); } else if(SDL_HasMMX()) { while ( h-- ) { SDL_memcpyMMX(dst, src, w); src += srcskip; dst += dstskip; } __asm__ __volatile__ ( " emms\n" ::); } else #endif while ( h-- ) { SDL_memcpy(dst, src, w); src += srcskip; dst += dstskip; } } static void SDL_BlitCopyOverlap(SDL_BlitInfo *info) { Uint8 *src, *dst; int w, h; int srcskip, dstskip; w = info->d_width*info->dst->BytesPerPixel; h = info->d_height; src = info->s_pixels; dst = info->d_pixels; srcskip = w+info->s_skip; dstskip = w+info->d_skip; if ( dst < src ) { while ( h-- ) { SDL_memcpy(dst, src, w); src += srcskip; dst += dstskip; } } else { src += ((h-1) * srcskip); dst += ((h-1) * dstskip); while ( h-- ) { SDL_revcpy(dst, src, w); src -= srcskip; dst -= dstskip; } } } /* Figure out which of many blit routines to set up on a surface */ int SDL_CalculateBlit(SDL_Surface *surface) { int blit_index; /* Clean everything out to start */ if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) { SDL_UnRLESurface(surface, 1); } surface->map->sw_blit = NULL; /* Figure out if an accelerated hardware blit is possible */ surface->flags &= ~SDL_HWACCEL; if ( surface->map->identity ) { int hw_blit_ok; if ( (surface->flags & SDL_HWSURFACE) == SDL_HWSURFACE ) { /* We only support accelerated blitting to hardware */ if ( surface->map->dst->flags & SDL_HWSURFACE ) { hw_blit_ok = current_video->info.blit_hw; } else { hw_blit_ok = 0; } if (hw_blit_ok && (surface->flags & SDL_SRCCOLORKEY)) { hw_blit_ok = current_video->info.blit_hw_CC; } if ( hw_blit_ok && (surface->flags & SDL_SRCALPHA) ) { hw_blit_ok = current_video->info.blit_hw_A; } } else { /* We only support accelerated blitting to hardware */ if ( surface->map->dst->flags & SDL_HWSURFACE ) { hw_blit_ok = current_video->info.blit_sw; } else { hw_blit_ok = 0; } if (hw_blit_ok && (surface->flags & SDL_SRCCOLORKEY)) { hw_blit_ok = current_video->info.blit_sw_CC; } if ( hw_blit_ok && (surface->flags & SDL_SRCALPHA) ) { hw_blit_ok = current_video->info.blit_sw_A; } } if ( hw_blit_ok ) { SDL_VideoDevice *video = current_video; SDL_VideoDevice *this = current_video; video->CheckHWBlit(this, surface, surface->map->dst); } } /* Get the blit function index, based on surface mode */ /* { 0 = nothing, 1 = colorkey, 2 = alpha, 3 = colorkey+alpha } */ blit_index = 0; blit_index |= (!!(surface->flags & SDL_SRCCOLORKEY)) << 0; if ( surface->flags & SDL_SRCALPHA && (surface->format->alpha != SDL_ALPHA_OPAQUE || surface->format->Amask) ) { blit_index |= 2; } /* Check for special "identity" case -- copy blit */ if ( surface->map->identity && blit_index == 0 ) { surface->map->sw_data->blit = SDL_BlitCopy; /* Handle overlapping blits on the same surface */ if ( surface == surface->map->dst ) { surface->map->sw_data->blit = SDL_BlitCopyOverlap; } } else { if ( surface->format->BitsPerPixel < 8 ) { surface->map->sw_data->blit = SDL_CalculateBlit0(surface, blit_index); } else { switch ( surface->format->BytesPerPixel ) { case 1: surface->map->sw_data->blit = SDL_CalculateBlit1(surface, blit_index); break; case 2: case 3: case 4: surface->map->sw_data->blit = SDL_CalculateBlitN(surface, blit_index); break; default: surface->map->sw_data->blit = NULL; break; } } } /* Make sure we have a blit function */ if ( surface->map->sw_data->blit == NULL ) { SDL_InvalidateMap(surface->map); SDL_SetError("Blit combination not supported"); return(-1); } /* Choose software blitting function */ if(surface->flags & SDL_RLEACCELOK && (surface->flags & SDL_HWACCEL) != SDL_HWACCEL) { if(surface->map->identity && (blit_index == 1 || (blit_index == 3 && !surface->format->Amask))) { if ( SDL_RLESurface(surface) == 0 ) surface->map->sw_blit = SDL_RLEBlit; } else if(blit_index == 2 && surface->format->Amask) { if ( SDL_RLESurface(surface) == 0 ) surface->map->sw_blit = SDL_RLEAlphaBlit; } } if ( surface->map->sw_blit == NULL ) { surface->map->sw_blit = SDL_SoftBlit; } return(0); }