296 lines
8.4 KiB
C
Executable file
296 lines
8.4 KiB
C
Executable file
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2021 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#include "../SDL_internal.h"
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#include "SDL_video.h"
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#include "SDL_sysvideo.h"
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#include "SDL_blit.h"
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#include "SDL_blit_auto.h"
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#include "SDL_blit_copy.h"
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#include "SDL_blit_slow.h"
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#include "SDL_RLEaccel_c.h"
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#include "SDL_pixels_c.h"
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/* The general purpose software blit routine */
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static int SDLCALL
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SDL_SoftBlit(SDL_Surface * src, SDL_Rect * srcrect,
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SDL_Surface * dst, SDL_Rect * dstrect)
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{
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int okay;
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int src_locked;
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int dst_locked;
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/* Everything is okay at the beginning... */
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okay = 1;
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/* Lock the destination if it's in hardware */
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dst_locked = 0;
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if (SDL_MUSTLOCK(dst)) {
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if (SDL_LockSurface(dst) < 0) {
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okay = 0;
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} else {
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dst_locked = 1;
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}
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}
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/* Lock the source if it's in hardware */
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src_locked = 0;
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if (SDL_MUSTLOCK(src)) {
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if (SDL_LockSurface(src) < 0) {
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okay = 0;
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} else {
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src_locked = 1;
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}
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}
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/* Set up source and destination buffer pointers, and BLIT! */
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if (okay && !SDL_RectEmpty(srcrect)) {
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SDL_BlitFunc RunBlit;
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SDL_BlitInfo *info = &src->map->info;
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/* Set up the blit information */
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info->src = (Uint8 *) src->pixels +
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(Uint16) srcrect->y * src->pitch +
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(Uint16) srcrect->x * info->src_fmt->BytesPerPixel;
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info->src_w = srcrect->w;
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info->src_h = srcrect->h;
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info->src_pitch = src->pitch;
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info->src_skip =
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info->src_pitch - info->src_w * info->src_fmt->BytesPerPixel;
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info->dst =
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(Uint8 *) dst->pixels + (Uint16) dstrect->y * dst->pitch +
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(Uint16) dstrect->x * info->dst_fmt->BytesPerPixel;
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info->dst_w = dstrect->w;
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info->dst_h = dstrect->h;
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info->dst_pitch = dst->pitch;
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info->dst_skip =
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info->dst_pitch - info->dst_w * info->dst_fmt->BytesPerPixel;
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RunBlit = (SDL_BlitFunc) src->map->data;
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/* Run the actual software blit */
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RunBlit(info);
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}
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/* We need to unlock the surfaces if they're locked */
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if (dst_locked) {
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SDL_UnlockSurface(dst);
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}
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if (src_locked) {
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SDL_UnlockSurface(src);
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}
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/* Blit is done! */
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return (okay ? 0 : -1);
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}
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#if SDL_HAVE_BLIT_AUTO
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#ifdef __MACOSX__
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#include <sys/sysctl.h>
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static SDL_bool
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SDL_UseAltivecPrefetch()
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{
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const char key[] = "hw.l3cachesize";
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u_int64_t result = 0;
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size_t typeSize = sizeof(result);
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if (sysctlbyname(key, &result, &typeSize, NULL, 0) == 0 && result > 0) {
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return SDL_TRUE;
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} else {
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return SDL_FALSE;
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}
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}
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#else
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static SDL_bool
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SDL_UseAltivecPrefetch()
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{
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/* Just guess G4 */
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return SDL_TRUE;
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}
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#endif /* __MACOSX__ */
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static SDL_BlitFunc
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SDL_ChooseBlitFunc(Uint32 src_format, Uint32 dst_format, int flags,
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SDL_BlitFuncEntry * entries)
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{
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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));
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static int features = 0x7fffffff;
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/* Get the available CPU features */
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if (features == 0x7fffffff) {
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const char *override = SDL_getenv("SDL_BLIT_CPU_FEATURES");
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features = SDL_CPU_ANY;
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/* Allow an override for testing .. */
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if (override) {
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SDL_sscanf(override, "%u", &features);
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} else {
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if (SDL_HasMMX()) {
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features |= SDL_CPU_MMX;
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}
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if (SDL_Has3DNow()) {
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features |= SDL_CPU_3DNOW;
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}
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if (SDL_HasSSE()) {
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features |= SDL_CPU_SSE;
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}
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if (SDL_HasSSE2()) {
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features |= SDL_CPU_SSE2;
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}
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if (SDL_HasAltiVec()) {
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if (SDL_UseAltivecPrefetch()) {
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features |= SDL_CPU_ALTIVEC_PREFETCH;
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} else {
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features |= SDL_CPU_ALTIVEC_NOPREFETCH;
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}
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}
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}
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}
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for (i = 0; entries[i].func; ++i) {
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/* Check for matching pixel formats */
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if (src_format != entries[i].src_format) {
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continue;
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}
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if (dst_format != entries[i].dst_format) {
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continue;
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}
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/* Check flags */
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if ((flagcheck & entries[i].flags) != flagcheck) {
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continue;
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}
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/* Check CPU features */
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if ((entries[i].cpu & features) != entries[i].cpu) {
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continue;
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}
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/* We found the best one! */
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return entries[i].func;
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}
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return NULL;
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}
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#endif /* SDL_HAVE_BLIT_AUTO */
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/* Figure out which of many blit routines to set up on a surface */
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int
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SDL_CalculateBlit(SDL_Surface * surface)
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{
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SDL_BlitFunc blit = NULL;
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SDL_BlitMap *map = surface->map;
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SDL_Surface *dst = map->dst;
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/* We don't currently support blitting to < 8 bpp surfaces */
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if (dst->format->BitsPerPixel < 8) {
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SDL_InvalidateMap(map);
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return SDL_SetError("Blit combination not supported");
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}
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#if SDL_HAVE_RLE
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/* Clean everything out to start */
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if ((surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL) {
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SDL_UnRLESurface(surface, 1);
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}
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#endif
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map->blit = SDL_SoftBlit;
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map->info.src_fmt = surface->format;
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map->info.src_pitch = surface->pitch;
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map->info.dst_fmt = dst->format;
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map->info.dst_pitch = dst->pitch;
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#if SDL_HAVE_RLE
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/* See if we can do RLE acceleration */
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if (map->info.flags & SDL_COPY_RLE_DESIRED) {
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if (SDL_RLESurface(surface) == 0) {
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return 0;
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}
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}
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#endif
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/* Choose a standard blit function */
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if (map->identity && !(map->info.flags & ~SDL_COPY_RLE_DESIRED)) {
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blit = SDL_BlitCopy;
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} else if (surface->format->Rloss > 8 || dst->format->Rloss > 8) {
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/* Greater than 8 bits per channel not supported yet */
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SDL_InvalidateMap(map);
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return SDL_SetError("Blit combination not supported");
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}
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#if SDL_HAVE_BLIT_0
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else if (surface->format->BitsPerPixel < 8 &&
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SDL_ISPIXELFORMAT_INDEXED(surface->format->format)) {
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blit = SDL_CalculateBlit0(surface);
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}
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#endif
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#if SDL_HAVE_BLIT_1
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else if (surface->format->BytesPerPixel == 1 &&
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SDL_ISPIXELFORMAT_INDEXED(surface->format->format)) {
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blit = SDL_CalculateBlit1(surface);
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}
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#endif
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#if SDL_HAVE_BLIT_A
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else if (map->info.flags & SDL_COPY_BLEND) {
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blit = SDL_CalculateBlitA(surface);
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}
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#endif
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#if SDL_HAVE_BLIT_N
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else {
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blit = SDL_CalculateBlitN(surface);
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}
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#endif
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#if SDL_HAVE_BLIT_AUTO
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if (blit == NULL) {
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Uint32 src_format = surface->format->format;
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Uint32 dst_format = dst->format->format;
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blit =
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SDL_ChooseBlitFunc(src_format, dst_format, map->info.flags,
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SDL_GeneratedBlitFuncTable);
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}
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#endif
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#ifndef TEST_SLOW_BLIT
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if (blit == NULL)
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#endif
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{
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Uint32 src_format = surface->format->format;
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Uint32 dst_format = dst->format->format;
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if (!SDL_ISPIXELFORMAT_INDEXED(src_format) &&
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!SDL_ISPIXELFORMAT_FOURCC(src_format) &&
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!SDL_ISPIXELFORMAT_INDEXED(dst_format) &&
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!SDL_ISPIXELFORMAT_FOURCC(dst_format)) {
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blit = SDL_Blit_Slow;
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}
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}
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map->data = blit;
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/* Make sure we have a blit function */
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if (blit == NULL) {
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SDL_InvalidateMap(map);
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return SDL_SetError("Blit combination not supported");
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}
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return 0;
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}
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/* vi: set ts=4 sw=4 expandtab: */
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