| /* |
| Simple DirectMedia Layer |
| Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org> |
| |
| This software is provided 'as-is', without any express or implied |
| warranty. In no event will the authors be held liable for any damages |
| arising from the use of this software. |
| |
| Permission is granted to anyone to use this software for any purpose, |
| including commercial applications, and to alter it and redistribute it |
| freely, subject to the following restrictions: |
| |
| 1. The origin of this software must not be misrepresented; you must not |
| claim that you wrote the original software. If you use this software |
| in a product, an acknowledgment in the product documentation would be |
| appreciated but is not required. |
| 2. Altered source versions must be plainly marked as such, and must not be |
| misrepresented as being the original software. |
| 3. This notice may not be removed or altered from any source distribution. |
| */ |
| #include "../SDL_internal.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 SDLCALL 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 && !SDL_RectEmpty(srcrect)) { |
| 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; |
| } |
| |
| #if SDL_HAVE_BLIT_AUTO |
| |
| #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 = (flags & (SDL_COPY_MODULATE_COLOR | SDL_COPY_MODULATE_ALPHA | SDL_COPY_BLEND | SDL_COPY_ADD | SDL_COPY_MOD | SDL_COPY_MUL | SDL_COPY_COLORKEY | SDL_COPY_NEAREST)); |
| static int features = 0x7fffffff; |
| |
| /* Get the available CPU features */ |
| if (features == 0x7fffffff) { |
| const char *override = SDL_getenv("SDL_BLIT_CPU_FEATURES"); |
| |
| features = SDL_CPU_ANY; |
| |
| /* Allow an override for testing .. */ |
| if (override) { |
| (void)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 flags */ |
| if ((flagcheck & entries[i].flags) != flagcheck) { |
| continue; |
| } |
| |
| /* Check CPU features */ |
| if ((entries[i].cpu & features) != entries[i].cpu) { |
| continue; |
| } |
| |
| /* We found the best one! */ |
| return entries[i].func; |
| } |
| return NULL; |
| } |
| #endif /* SDL_HAVE_BLIT_AUTO */ |
| |
| /* 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; |
| |
| /* We don't currently support blitting to < 8 bpp surfaces */ |
| if (dst->format->BitsPerPixel < 8) { |
| SDL_InvalidateMap(map); |
| return SDL_SetError("Blit combination not supported"); |
| } |
| |
| #if SDL_HAVE_RLE |
| /* Clean everything out to start */ |
| if ((surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL) { |
| SDL_UnRLESurface(surface, 1); |
| } |
| #endif |
| |
| 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; |
| |
| #if SDL_HAVE_RLE |
| /* See if we can do RLE acceleration */ |
| if (map->info.flags & SDL_COPY_RLE_DESIRED) { |
| if (SDL_RLESurface(surface) == 0) { |
| return 0; |
| } |
| } |
| #endif |
| |
| /* Choose a standard blit function */ |
| if (map->identity && !(map->info.flags & ~SDL_COPY_RLE_DESIRED)) { |
| blit = SDL_BlitCopy; |
| } else if (surface->format->Rloss > 8 || dst->format->Rloss > 8) { |
| blit = SDL_Blit_Slow; |
| } |
| #if SDL_HAVE_BLIT_0 |
| else if (surface->format->BitsPerPixel < 8 && |
| SDL_ISPIXELFORMAT_INDEXED(surface->format->format)) { |
| blit = SDL_CalculateBlit0(surface); |
| } |
| #endif |
| #if SDL_HAVE_BLIT_1 |
| else if (surface->format->BytesPerPixel == 1 && |
| SDL_ISPIXELFORMAT_INDEXED(surface->format->format)) { |
| blit = SDL_CalculateBlit1(surface); |
| } |
| #endif |
| #if SDL_HAVE_BLIT_A |
| else if (map->info.flags & SDL_COPY_BLEND) { |
| blit = SDL_CalculateBlitA(surface); |
| } |
| #endif |
| #if SDL_HAVE_BLIT_N |
| else { |
| blit = SDL_CalculateBlitN(surface); |
| } |
| #endif |
| #if SDL_HAVE_BLIT_AUTO |
| if (blit == NULL) { |
| Uint32 src_format = surface->format->format; |
| Uint32 dst_format = dst->format->format; |
| |
| blit = |
| SDL_ChooseBlitFunc(src_format, dst_format, map->info.flags, |
| SDL_GeneratedBlitFuncTable); |
| } |
| #endif |
| |
| #ifndef TEST_SLOW_BLIT |
| if (blit == NULL) |
| #endif |
| { |
| Uint32 src_format = surface->format->format; |
| Uint32 dst_format = dst->format->format; |
| |
| if (!SDL_ISPIXELFORMAT_INDEXED(src_format) && |
| !SDL_ISPIXELFORMAT_FOURCC(src_format) && |
| !SDL_ISPIXELFORMAT_INDEXED(dst_format) && |
| !SDL_ISPIXELFORMAT_FOURCC(dst_format)) { |
| blit = SDL_Blit_Slow; |
| } |
| } |
| map->data = blit; |
| |
| /* Make sure we have a blit function */ |
| if (blit == NULL) { |
| SDL_InvalidateMap(map); |
| return SDL_SetError("Blit combination not supported"); |
| } |
| |
| return 0; |
| } |
| |
| /* vi: set ts=4 sw=4 expandtab: */ |
