Mercurial > sdl-ios-xcode
view src/video/SDL_blit.c @ 4590:1ad70fb49fcb
Fix so many things that there is little place in this column to list them all but the result is that blending modes just work now for drawing primitives.
Fixes involved:
1. Fix handling of alpha channel when SDL_BLENDMODE_NONE is set.
2. Make xrendercolor use floating-point values for color channels and then convert to 16 bit ints.
3. Fix handling of visuals in SDL_x11modes.c so that a 32 bit ARGB visual is used.
4. Fix the background pixel value in SDL_x11window.c so that the window background has an alpha value of 0xFF and not 0.
author | Sunny Sachanandani <sunnysachanandani@gmail.com> |
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date | Fri, 09 Jul 2010 21:36:41 +0530 |
parents | f7b03b6838cb |
children | e743b9c3f6d6 |
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/* SDL - Simple DirectMedia Layer Copyright (C) 1997-2010 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_sysvideo.h" #include "SDL_blit.h" #include "SDL_blit_auto.h" #include "SDL_blit_copy.h" #include "SDL_blit_slow.h" #include "SDL_RLEaccel_c.h" #include "SDL_pixels_c.h" /* 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_BlitFunc RunBlit; SDL_BlitInfo *info = &src->map->info; /* Set up the blit information */ info->src = (Uint8 *) src->pixels + (Uint16) srcrect->y * src->pitch + (Uint16) srcrect->x * info->src_fmt->BytesPerPixel; info->src_w = srcrect->w; info->src_h = srcrect->h; info->src_pitch = src->pitch; info->src_skip = info->src_pitch - info->src_w * info->src_fmt->BytesPerPixel; info->dst = (Uint8 *) dst->pixels + (Uint16) dstrect->y * dst->pitch + (Uint16) dstrect->x * info->dst_fmt->BytesPerPixel; info->dst_w = dstrect->w; info->dst_h = dstrect->h; info->dst_pitch = dst->pitch; info->dst_skip = info->dst_pitch - info->dst_w * info->dst_fmt->BytesPerPixel; RunBlit = (SDL_BlitFunc) src->map->data; /* 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); } #ifdef __MACOSX__ #include <sys/sysctl.h> static SDL_bool SDL_UseAltivecPrefetch() { const char key[] = "hw.l3cachesize"; u_int64_t result = 0; size_t typeSize = sizeof(result); if (sysctlbyname(key, &result, &typeSize, NULL, 0) == 0 && result > 0) { return SDL_TRUE; } else { return SDL_FALSE; } } #else static SDL_bool SDL_UseAltivecPrefetch() { /* Just guess G4 */ return SDL_TRUE; } #endif /* __MACOSX__ */ static SDL_BlitFunc SDL_ChooseBlitFunc(Uint32 src_format, Uint32 dst_format, int flags, SDL_BlitFuncEntry * entries) { int i, flagcheck; static Uint32 features = 0xffffffff; /* Get the available CPU features */ if (features == 0xffffffff) { const char *override = SDL_getenv("SDL_BLIT_CPU_FEATURES"); features = SDL_CPU_ANY; /* Allow an override for testing .. */ if (override) { SDL_sscanf(override, "%u", &features); } else { if (SDL_HasMMX()) { features |= SDL_CPU_MMX; } if (SDL_Has3DNow()) { features |= SDL_CPU_3DNOW; } if (SDL_HasSSE()) { features |= SDL_CPU_SSE; } if (SDL_HasSSE2()) { features |= SDL_CPU_SSE2; } if (SDL_HasAltiVec()) { if (SDL_UseAltivecPrefetch()) { features |= SDL_CPU_ALTIVEC_PREFETCH; } else { features |= SDL_CPU_ALTIVEC_NOPREFETCH; } } } } for (i = 0; entries[i].func; ++i) { /* Check for matching pixel formats */ if (src_format != entries[i].src_format) { continue; } if (dst_format != entries[i].dst_format) { continue; } /* Check modulation flags */ flagcheck = (flags & (SDL_COPY_MODULATE_COLOR | SDL_COPY_MODULATE_ALPHA)); if ((flagcheck & entries[i].flags) != flagcheck) { continue; } /* Check blend flags */ flagcheck = (flags & (SDL_COPY_MASK | SDL_COPY_BLEND | SDL_COPY_ADD | SDL_COPY_MOD)); if ((flagcheck & entries[i].flags) != flagcheck) { continue; } /* Check colorkey flag */ flagcheck = (flags & SDL_COPY_COLORKEY); if ((flagcheck & entries[i].flags) != flagcheck) { continue; } /* Check scaling flags */ flagcheck = (flags & SDL_COPY_NEAREST); if ((flagcheck & entries[i].flags) != flagcheck) { continue; } /* Check CPU features */ flagcheck = entries[i].cpu; if ((flagcheck & features) != flagcheck) { continue; } /* We found the best one! */ return entries[i].func; } return NULL; } /* Figure out which of many blit routines to set up on a surface */ int SDL_CalculateBlit(SDL_Surface * surface) { SDL_BlitFunc blit = NULL; SDL_BlitMap *map = surface->map; SDL_Surface *dst = map->dst; /* Clean everything out to start */ if ((surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL) { SDL_UnRLESurface(surface, 1); } map->blit = SDL_SoftBlit; map->info.src_fmt = surface->format; map->info.src_pitch = surface->pitch; map->info.dst_fmt = dst->format; map->info.dst_pitch = dst->pitch; /* See if we can do RLE acceleration */ if (map->info.flags & SDL_COPY_RLE_DESIRED) { if (SDL_RLESurface(surface) == 0) { return 0; } } /* Choose a standard blit function */ if (map->identity && !(map->info.flags & ~SDL_COPY_RLE_DESIRED)) { /* Handle overlapping blits on the same surface */ if (surface == dst) { blit = SDL_BlitCopyOverlap; } else { blit = SDL_BlitCopy; } } else if (surface->format->BitsPerPixel < 8) { blit = SDL_CalculateBlit0(surface); } else if (surface->format->BytesPerPixel == 1) { blit = SDL_CalculateBlit1(surface); } else if (map->info.flags & SDL_COPY_BLEND) { blit = SDL_CalculateBlitA(surface); } else { blit = SDL_CalculateBlitN(surface); } if (blit == NULL) { Uint32 src_format = SDL_MasksToPixelFormatEnum(surface->format->BitsPerPixel, surface->format->Rmask, surface->format->Gmask, surface->format->Bmask, surface->format->Amask); Uint32 dst_format = SDL_MasksToPixelFormatEnum(dst->format->BitsPerPixel, dst->format->Rmask, dst->format->Gmask, dst->format->Bmask, dst->format->Amask); blit = SDL_ChooseBlitFunc(src_format, dst_format, map->info.flags, SDL_GeneratedBlitFuncTable); } #ifndef TEST_SLOW_BLIT if (blit == NULL) #endif { if (surface->format->BytesPerPixel > 1 && dst->format->BytesPerPixel > 1) { blit = SDL_Blit_Slow; } } map->data = blit; /* Make sure we have a blit function */ if (blit == NULL) { SDL_InvalidateMap(map); SDL_SetError("Blit combination not supported"); return (-1); } return (0); } /* vi: set ts=4 sw=4 expandtab: */