| /* |
| 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_RLEaccel_c.h" |
| #include "SDL_pixels_c.h" |
| #include "SDL_yuv_c.h" |
| #include "../render/SDL_sysrender.h" |
| |
| /* Check to make sure we can safely check multiplication of surface w and pitch and it won't overflow size_t */ |
| SDL_COMPILE_TIME_ASSERT(surface_size_assumptions, |
| sizeof(int) == sizeof(Sint32) && sizeof(size_t) >= sizeof(Sint32)); |
| |
| SDL_COMPILE_TIME_ASSERT(can_indicate_overflow, SDL_SIZE_MAX > SDL_MAX_SINT32); |
| |
| /* Public routines */ |
| |
| /* |
| * Calculate the pad-aligned scanline width of a surface. |
| * Return SDL_SIZE_MAX on overflow. |
| * |
| * for FOURCC, use SDL_CalculateYUVSize() |
| */ |
| static size_t SDL_CalculatePitch(Uint32 format, size_t width, SDL_bool minimal) |
| { |
| size_t pitch; |
| |
| if (SDL_BITSPERPIXEL(format) >= 8) { |
| if (SDL_size_mul_overflow(width, SDL_BYTESPERPIXEL(format), &pitch)) { |
| return SDL_SIZE_MAX; |
| } |
| } else { |
| if (SDL_size_mul_overflow(width, SDL_BITSPERPIXEL(format), &pitch)) { |
| return SDL_SIZE_MAX; |
| } |
| if (SDL_size_add_overflow(pitch, 7, &pitch)) { |
| return SDL_SIZE_MAX; |
| } |
| pitch /= 8; |
| } |
| if (!minimal) { |
| /* 4-byte aligning for speed */ |
| if (SDL_size_add_overflow(pitch, 3, &pitch)) { |
| return SDL_SIZE_MAX; |
| } |
| pitch &= ~3; |
| } |
| return pitch; |
| } |
| |
| /* TODO: In SDL 3, drop the unused flags and depth parameters */ |
| /* |
| * Create an empty RGB surface of the appropriate depth using the given |
| * enum SDL_PIXELFORMAT_* format |
| */ |
| SDL_Surface *SDL_CreateRGBSurfaceWithFormat(Uint32 flags, int width, int height, int depth, |
| Uint32 format) |
| { |
| size_t pitch; |
| SDL_Surface *surface; |
| |
| /* The flags are no longer used, make the compiler happy */ |
| (void)flags; |
| |
| if (width < 0) { |
| SDL_InvalidParamError("width"); |
| return NULL; |
| } |
| |
| if (height < 0) { |
| SDL_InvalidParamError("height"); |
| return NULL; |
| } |
| |
| if (SDL_ISPIXELFORMAT_FOURCC(format)) { |
| SDL_SetError("invalid format"); |
| return NULL; |
| } else { |
| pitch = SDL_CalculatePitch(format, width, SDL_FALSE); |
| if (pitch > SDL_MAX_SINT32) { |
| /* Overflow... */ |
| SDL_OutOfMemory(); |
| return NULL; |
| } |
| } |
| |
| /* Allocate the surface */ |
| surface = (SDL_Surface *)SDL_calloc(1, sizeof(*surface)); |
| if (surface == NULL) { |
| SDL_OutOfMemory(); |
| return NULL; |
| } |
| |
| surface->format = SDL_AllocFormat(format); |
| if (!surface->format) { |
| SDL_FreeSurface(surface); |
| return NULL; |
| } |
| surface->w = width; |
| surface->h = height; |
| surface->pitch = (int)pitch; |
| SDL_SetClipRect(surface, NULL); |
| |
| if (SDL_ISPIXELFORMAT_INDEXED(surface->format->format)) { |
| SDL_Palette *palette = |
| SDL_AllocPalette((1 << surface->format->BitsPerPixel)); |
| if (palette == NULL) { |
| SDL_FreeSurface(surface); |
| return NULL; |
| } |
| if (palette->ncolors == 2) { |
| /* Create a black and white bitmap palette */ |
| palette->colors[0].r = 0xFF; |
| palette->colors[0].g = 0xFF; |
| palette->colors[0].b = 0xFF; |
| palette->colors[1].r = 0x00; |
| palette->colors[1].g = 0x00; |
| palette->colors[1].b = 0x00; |
| } |
| SDL_SetSurfacePalette(surface, palette); |
| SDL_FreePalette(palette); |
| } |
| |
| /* Get the pixels */ |
| if (surface->w && surface->h) { |
| /* Assumptions checked in surface_size_assumptions assert above */ |
| size_t size; |
| if (SDL_size_mul_overflow(surface->h, surface->pitch, &size)) { |
| /* Overflow... */ |
| SDL_FreeSurface(surface); |
| SDL_OutOfMemory(); |
| return NULL; |
| } |
| |
| surface->pixels = SDL_SIMDAlloc(size); |
| if (!surface->pixels) { |
| SDL_FreeSurface(surface); |
| SDL_OutOfMemory(); |
| return NULL; |
| } |
| surface->flags |= SDL_SIMD_ALIGNED; |
| /* This is important for bitmaps */ |
| SDL_memset(surface->pixels, 0, size); |
| } |
| |
| /* Allocate an empty mapping */ |
| surface->map = SDL_AllocBlitMap(); |
| if (!surface->map) { |
| SDL_FreeSurface(surface); |
| return NULL; |
| } |
| |
| /* By default surface with an alpha mask are set up for blending */ |
| if (surface->format->Amask) { |
| SDL_SetSurfaceBlendMode(surface, SDL_BLENDMODE_BLEND); |
| } |
| |
| /* The surface is ready to go */ |
| surface->refcount = 1; |
| return surface; |
| } |
| |
| /* TODO: In SDL 3, drop the unused flags parameter */ |
| /* |
| * Create an empty RGB surface of the appropriate depth |
| */ |
| SDL_Surface *SDL_CreateRGBSurface(Uint32 flags, |
| int width, int height, int depth, |
| Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask) |
| { |
| Uint32 format; |
| |
| /* Get the pixel format */ |
| format = SDL_MasksToPixelFormatEnum(depth, Rmask, Gmask, Bmask, Amask); |
| if (format == SDL_PIXELFORMAT_UNKNOWN) { |
| SDL_SetError("Unknown pixel format"); |
| return NULL; |
| } |
| |
| return SDL_CreateRGBSurfaceWithFormat(flags, width, height, depth, format); |
| } |
| |
| /* |
| * Create an RGB surface from an existing memory buffer |
| */ |
| SDL_Surface *SDL_CreateRGBSurfaceFrom(void *pixels, |
| int width, int height, int depth, int pitch, |
| Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, |
| Uint32 Amask) |
| { |
| SDL_Surface *surface; |
| Uint32 format; |
| size_t minimalPitch; |
| |
| if (width < 0) { |
| SDL_InvalidParamError("width"); |
| return NULL; |
| } |
| |
| if (height < 0) { |
| SDL_InvalidParamError("height"); |
| return NULL; |
| } |
| |
| format = SDL_MasksToPixelFormatEnum(depth, Rmask, Gmask, Bmask, Amask); |
| |
| if (format == SDL_PIXELFORMAT_UNKNOWN) { |
| SDL_SetError("Unknown pixel format"); |
| return NULL; |
| } |
| |
| minimalPitch = SDL_CalculatePitch(format, width, SDL_TRUE); |
| |
| if (pitch < 0 || (pitch > 0 && ((size_t)pitch) < minimalPitch)) { |
| SDL_InvalidParamError("pitch"); |
| return NULL; |
| } |
| |
| surface = SDL_CreateRGBSurfaceWithFormat(0, 0, 0, depth, format); |
| if (surface != NULL) { |
| surface->flags |= SDL_PREALLOC; |
| surface->pixels = pixels; |
| surface->w = width; |
| surface->h = height; |
| surface->pitch = pitch; |
| SDL_SetClipRect(surface, NULL); |
| } |
| return surface; |
| } |
| |
| /* TODO: In SDL 3, drop the unused depth parameter */ |
| /* |
| * Create an RGB surface from an existing memory buffer using the given given |
| * enum SDL_PIXELFORMAT_* format |
| */ |
| SDL_Surface *SDL_CreateRGBSurfaceWithFormatFrom(void *pixels, |
| int width, int height, int depth, int pitch, |
| Uint32 format) |
| { |
| SDL_Surface *surface; |
| size_t minimalPitch; |
| |
| if (width < 0) { |
| SDL_InvalidParamError("width"); |
| return NULL; |
| } |
| |
| if (height < 0) { |
| SDL_InvalidParamError("height"); |
| return NULL; |
| } |
| |
| if (SDL_ISPIXELFORMAT_FOURCC(format)) { |
| SDL_SetError("invalid format"); |
| return NULL; |
| } else { |
| minimalPitch = SDL_CalculatePitch(format, width, SDL_TRUE); |
| } |
| |
| if (pitch < 0 || (pitch > 0 && ((size_t)pitch) < minimalPitch)) { |
| SDL_InvalidParamError("pitch"); |
| return NULL; |
| } |
| |
| surface = SDL_CreateRGBSurfaceWithFormat(0, 0, 0, depth, format); |
| if (surface != NULL) { |
| surface->flags |= SDL_PREALLOC; |
| surface->pixels = pixels; |
| surface->w = width; |
| surface->h = height; |
| surface->pitch = pitch; |
| SDL_SetClipRect(surface, NULL); |
| } |
| return surface; |
| } |
| |
| int SDL_SetSurfacePalette(SDL_Surface *surface, SDL_Palette *palette) |
| { |
| if (surface == NULL) { |
| return SDL_InvalidParamError("SDL_SetSurfacePalette(): surface"); |
| } |
| if (SDL_SetPixelFormatPalette(surface->format, palette) < 0) { |
| return -1; |
| } |
| SDL_InvalidateMap(surface->map); |
| |
| return 0; |
| } |
| |
| int SDL_SetSurfaceRLE(SDL_Surface *surface, int flag) |
| { |
| int flags; |
| |
| if (surface == NULL) { |
| return -1; |
| } |
| |
| flags = surface->map->info.flags; |
| if (flag) { |
| surface->map->info.flags |= SDL_COPY_RLE_DESIRED; |
| } else { |
| surface->map->info.flags &= ~SDL_COPY_RLE_DESIRED; |
| } |
| if (surface->map->info.flags != flags) { |
| SDL_InvalidateMap(surface->map); |
| } |
| return 0; |
| } |
| |
| SDL_bool SDL_HasSurfaceRLE(SDL_Surface *surface) |
| { |
| if (surface == NULL) { |
| return SDL_FALSE; |
| } |
| |
| if (!(surface->map->info.flags & SDL_COPY_RLE_DESIRED)) { |
| return SDL_FALSE; |
| } |
| |
| return SDL_TRUE; |
| } |
| |
| int SDL_SetColorKey(SDL_Surface *surface, int flag, Uint32 key) |
| { |
| int flags; |
| |
| if (surface == NULL) { |
| return SDL_InvalidParamError("surface"); |
| } |
| |
| if (surface->format->palette && key >= ((Uint32)surface->format->palette->ncolors)) { |
| return SDL_InvalidParamError("key"); |
| } |
| |
| if (flag & SDL_RLEACCEL) { |
| SDL_SetSurfaceRLE(surface, 1); |
| } |
| |
| flags = surface->map->info.flags; |
| if (flag) { |
| surface->map->info.flags |= SDL_COPY_COLORKEY; |
| surface->map->info.colorkey = key; |
| } else { |
| surface->map->info.flags &= ~SDL_COPY_COLORKEY; |
| } |
| if (surface->map->info.flags != flags) { |
| SDL_InvalidateMap(surface->map); |
| } |
| |
| return 0; |
| } |
| |
| SDL_bool SDL_HasColorKey(SDL_Surface *surface) |
| { |
| if (surface == NULL) { |
| return SDL_FALSE; |
| } |
| |
| if (!(surface->map->info.flags & SDL_COPY_COLORKEY)) { |
| return SDL_FALSE; |
| } |
| |
| return SDL_TRUE; |
| } |
| |
| int SDL_GetColorKey(SDL_Surface *surface, Uint32 *key) |
| { |
| if (surface == NULL) { |
| return SDL_InvalidParamError("surface"); |
| } |
| |
| if (!(surface->map->info.flags & SDL_COPY_COLORKEY)) { |
| return SDL_SetError("Surface doesn't have a colorkey"); |
| } |
| |
| if (key) { |
| *key = surface->map->info.colorkey; |
| } |
| return 0; |
| } |
| |
| /* This is a fairly slow function to switch from colorkey to alpha |
| NB: it doesn't handle bpp 1 or 3, because they have no alpha channel */ |
| static void SDL_ConvertColorkeyToAlpha(SDL_Surface *surface, SDL_bool ignore_alpha) |
| { |
| int x, y, bpp; |
| |
| if (surface == NULL) { |
| return; |
| } |
| |
| if (!(surface->map->info.flags & SDL_COPY_COLORKEY) || |
| !surface->format->Amask) { |
| return; |
| } |
| |
| bpp = surface->format->BytesPerPixel; |
| |
| SDL_LockSurface(surface); |
| |
| if (bpp == 2) { |
| Uint16 *row, *spot; |
| Uint16 ckey = (Uint16)surface->map->info.colorkey; |
| Uint16 mask = (Uint16)(~surface->format->Amask); |
| |
| /* Ignore, or not, alpha in colorkey comparison */ |
| if (ignore_alpha) { |
| ckey &= mask; |
| row = (Uint16 *)surface->pixels; |
| for (y = surface->h; y--;) { |
| spot = row; |
| for (x = surface->w; x--;) { |
| if ((*spot & mask) == ckey) { |
| *spot &= mask; |
| } |
| ++spot; |
| } |
| row += surface->pitch / 2; |
| } |
| } else { |
| row = (Uint16 *)surface->pixels; |
| for (y = surface->h; y--;) { |
| spot = row; |
| for (x = surface->w; x--;) { |
| if (*spot == ckey) { |
| *spot &= mask; |
| } |
| ++spot; |
| } |
| row += surface->pitch / 2; |
| } |
| } |
| } else if (bpp == 4) { |
| Uint32 *row, *spot; |
| Uint32 ckey = surface->map->info.colorkey; |
| Uint32 mask = ~surface->format->Amask; |
| |
| /* Ignore, or not, alpha in colorkey comparison */ |
| if (ignore_alpha) { |
| ckey &= mask; |
| row = (Uint32 *)surface->pixels; |
| for (y = surface->h; y--;) { |
| spot = row; |
| for (x = surface->w; x--;) { |
| if ((*spot & mask) == ckey) { |
| *spot &= mask; |
| } |
| ++spot; |
| } |
| row += surface->pitch / 4; |
| } |
| } else { |
| row = (Uint32 *)surface->pixels; |
| for (y = surface->h; y--;) { |
| spot = row; |
| for (x = surface->w; x--;) { |
| if (*spot == ckey) { |
| *spot &= mask; |
| } |
| ++spot; |
| } |
| row += surface->pitch / 4; |
| } |
| } |
| } |
| |
| SDL_UnlockSurface(surface); |
| |
| SDL_SetColorKey(surface, 0, 0); |
| SDL_SetSurfaceBlendMode(surface, SDL_BLENDMODE_BLEND); |
| } |
| |
| int SDL_SetSurfaceColorMod(SDL_Surface *surface, Uint8 r, Uint8 g, Uint8 b) |
| { |
| int flags; |
| |
| if (surface == NULL) { |
| return -1; |
| } |
| |
| surface->map->info.r = r; |
| surface->map->info.g = g; |
| surface->map->info.b = b; |
| |
| flags = surface->map->info.flags; |
| if (r != 0xFF || g != 0xFF || b != 0xFF) { |
| surface->map->info.flags |= SDL_COPY_MODULATE_COLOR; |
| } else { |
| surface->map->info.flags &= ~SDL_COPY_MODULATE_COLOR; |
| } |
| if (surface->map->info.flags != flags) { |
| SDL_InvalidateMap(surface->map); |
| } |
| return 0; |
| } |
| |
| int SDL_GetSurfaceColorMod(SDL_Surface *surface, Uint8 *r, Uint8 *g, Uint8 *b) |
| { |
| if (surface == NULL) { |
| return -1; |
| } |
| |
| if (r) { |
| *r = surface->map->info.r; |
| } |
| if (g) { |
| *g = surface->map->info.g; |
| } |
| if (b) { |
| *b = surface->map->info.b; |
| } |
| return 0; |
| } |
| |
| int SDL_SetSurfaceAlphaMod(SDL_Surface *surface, Uint8 alpha) |
| { |
| int flags; |
| |
| if (surface == NULL) { |
| return -1; |
| } |
| |
| surface->map->info.a = alpha; |
| |
| flags = surface->map->info.flags; |
| if (alpha != 0xFF) { |
| surface->map->info.flags |= SDL_COPY_MODULATE_ALPHA; |
| } else { |
| surface->map->info.flags &= ~SDL_COPY_MODULATE_ALPHA; |
| } |
| if (surface->map->info.flags != flags) { |
| SDL_InvalidateMap(surface->map); |
| } |
| return 0; |
| } |
| |
| int SDL_GetSurfaceAlphaMod(SDL_Surface *surface, Uint8 *alpha) |
| { |
| if (surface == NULL) { |
| return -1; |
| } |
| |
| if (alpha) { |
| *alpha = surface->map->info.a; |
| } |
| return 0; |
| } |
| |
| int SDL_SetSurfaceBlendMode(SDL_Surface *surface, SDL_BlendMode blendMode) |
| { |
| int flags, status; |
| |
| if (surface == NULL) { |
| return -1; |
| } |
| |
| status = 0; |
| flags = surface->map->info.flags; |
| surface->map->info.flags &= |
| ~(SDL_COPY_BLEND | SDL_COPY_ADD | SDL_COPY_MOD | SDL_COPY_MUL); |
| switch (blendMode) { |
| case SDL_BLENDMODE_NONE: |
| break; |
| case SDL_BLENDMODE_BLEND: |
| surface->map->info.flags |= SDL_COPY_BLEND; |
| break; |
| case SDL_BLENDMODE_ADD: |
| surface->map->info.flags |= SDL_COPY_ADD; |
| break; |
| case SDL_BLENDMODE_MOD: |
| surface->map->info.flags |= SDL_COPY_MOD; |
| break; |
| case SDL_BLENDMODE_MUL: |
| surface->map->info.flags |= SDL_COPY_MUL; |
| break; |
| default: |
| status = SDL_Unsupported(); |
| break; |
| } |
| |
| if (surface->map->info.flags != flags) { |
| SDL_InvalidateMap(surface->map); |
| } |
| |
| return status; |
| } |
| |
| int SDL_GetSurfaceBlendMode(SDL_Surface *surface, SDL_BlendMode *blendMode) |
| { |
| if (surface == NULL) { |
| return -1; |
| } |
| |
| if (blendMode == NULL) { |
| return 0; |
| } |
| |
| switch (surface->map->info.flags & (SDL_COPY_BLEND | SDL_COPY_ADD | SDL_COPY_MOD | SDL_COPY_MUL)) { |
| case SDL_COPY_BLEND: |
| *blendMode = SDL_BLENDMODE_BLEND; |
| break; |
| case SDL_COPY_ADD: |
| *blendMode = SDL_BLENDMODE_ADD; |
| break; |
| case SDL_COPY_MOD: |
| *blendMode = SDL_BLENDMODE_MOD; |
| break; |
| case SDL_COPY_MUL: |
| *blendMode = SDL_BLENDMODE_MUL; |
| break; |
| default: |
| *blendMode = SDL_BLENDMODE_NONE; |
| break; |
| } |
| return 0; |
| } |
| |
| SDL_bool SDL_SetClipRect(SDL_Surface *surface, const SDL_Rect *rect) |
| { |
| SDL_Rect full_rect; |
| |
| /* Don't do anything if there's no surface to act on */ |
| if (surface == NULL) { |
| return SDL_FALSE; |
| } |
| |
| /* Set up the full surface rectangle */ |
| full_rect.x = 0; |
| full_rect.y = 0; |
| full_rect.w = surface->w; |
| full_rect.h = surface->h; |
| |
| /* Set the clipping rectangle */ |
| if (rect == NULL) { |
| surface->clip_rect = full_rect; |
| return SDL_TRUE; |
| } |
| return SDL_IntersectRect(rect, &full_rect, &surface->clip_rect); |
| } |
| |
| void SDL_GetClipRect(SDL_Surface *surface, SDL_Rect *rect) |
| { |
| if (surface && rect) { |
| *rect = surface->clip_rect; |
| } |
| } |
| |
| /* |
| * Set up a blit between two surfaces -- split into three parts: |
| * The upper part, SDL_UpperBlit(), performs clipping and rectangle |
| * verification. The lower part is a pointer to a low level |
| * accelerated blitting function. |
| * |
| * These parts are separated out and each used internally by this |
| * library in the optimimum places. They are exported so that if |
| * you know exactly what you are doing, you can optimize your code |
| * by calling the one(s) you need. |
| */ |
| int SDL_LowerBlit(SDL_Surface *src, SDL_Rect *srcrect, |
| SDL_Surface *dst, SDL_Rect *dstrect) |
| { |
| /* Check to make sure the blit mapping is valid */ |
| if ((src->map->dst != dst) || |
| (dst->format->palette && |
| src->map->dst_palette_version != dst->format->palette->version) || |
| (src->format->palette && |
| src->map->src_palette_version != src->format->palette->version)) { |
| if (SDL_MapSurface(src, dst) < 0) { |
| return -1; |
| } |
| /* just here for debugging */ |
| /* printf */ |
| /* ("src = 0x%08X src->flags = %08X src->map->info.flags = %08x\ndst = 0x%08X dst->flags = %08X dst->map->info.flags = %08X\nsrc->map->blit = 0x%08x\n", */ |
| /* src, dst->flags, src->map->info.flags, dst, dst->flags, */ |
| /* dst->map->info.flags, src->map->blit); */ |
| } |
| return src->map->blit(src, srcrect, dst, dstrect); |
| } |
| |
| int SDL_UpperBlit(SDL_Surface *src, const SDL_Rect *srcrect, |
| SDL_Surface *dst, SDL_Rect *dstrect) |
| { |
| SDL_Rect fulldst; |
| int srcx, srcy, w, h; |
| |
| /* Make sure the surfaces aren't locked */ |
| if (src == NULL || dst == NULL) { |
| return SDL_InvalidParamError("SDL_UpperBlit(): src/dst"); |
| } |
| if (src->locked || dst->locked) { |
| return SDL_SetError("Surfaces must not be locked during blit"); |
| } |
| |
| /* If the destination rectangle is NULL, use the entire dest surface */ |
| if (dstrect == NULL) { |
| fulldst.x = fulldst.y = 0; |
| fulldst.w = dst->w; |
| fulldst.h = dst->h; |
| dstrect = &fulldst; |
| } |
| |
| /* clip the source rectangle to the source surface */ |
| if (srcrect) { |
| int maxw, maxh; |
| |
| srcx = srcrect->x; |
| w = srcrect->w; |
| if (srcx < 0) { |
| w += srcx; |
| dstrect->x -= srcx; |
| srcx = 0; |
| } |
| maxw = src->w - srcx; |
| if (maxw < w) { |
| w = maxw; |
| } |
| |
| srcy = srcrect->y; |
| h = srcrect->h; |
| if (srcy < 0) { |
| h += srcy; |
| dstrect->y -= srcy; |
| srcy = 0; |
| } |
| maxh = src->h - srcy; |
| if (maxh < h) { |
| h = maxh; |
| } |
| |
| } else { |
| srcx = srcy = 0; |
| w = src->w; |
| h = src->h; |
| } |
| |
| /* clip the destination rectangle against the clip rectangle */ |
| { |
| SDL_Rect *clip = &dst->clip_rect; |
| int dx, dy; |
| |
| dx = clip->x - dstrect->x; |
| if (dx > 0) { |
| w -= dx; |
| dstrect->x += dx; |
| srcx += dx; |
| } |
| dx = dstrect->x + w - clip->x - clip->w; |
| if (dx > 0) { |
| w -= dx; |
| } |
| |
| dy = clip->y - dstrect->y; |
| if (dy > 0) { |
| h -= dy; |
| dstrect->y += dy; |
| srcy += dy; |
| } |
| dy = dstrect->y + h - clip->y - clip->h; |
| if (dy > 0) { |
| h -= dy; |
| } |
| } |
| |
| /* Switch back to a fast blit if we were previously stretching */ |
| if (src->map->info.flags & SDL_COPY_NEAREST) { |
| src->map->info.flags &= ~SDL_COPY_NEAREST; |
| SDL_InvalidateMap(src->map); |
| } |
| |
| if (w > 0 && h > 0) { |
| SDL_Rect sr; |
| sr.x = srcx; |
| sr.y = srcy; |
| sr.w = dstrect->w = w; |
| sr.h = dstrect->h = h; |
| return SDL_LowerBlit(src, &sr, dst, dstrect); |
| } |
| dstrect->w = dstrect->h = 0; |
| return 0; |
| } |
| |
| int SDL_UpperBlitScaled(SDL_Surface *src, const SDL_Rect *srcrect, |
| SDL_Surface *dst, SDL_Rect *dstrect) |
| { |
| return SDL_PrivateUpperBlitScaled(src, srcrect, dst, dstrect, SDL_ScaleModeNearest); |
| } |
| |
| int SDL_PrivateUpperBlitScaled(SDL_Surface *src, const SDL_Rect *srcrect, |
| SDL_Surface *dst, SDL_Rect *dstrect, SDL_ScaleMode scaleMode) |
| { |
| double src_x0, src_y0, src_x1, src_y1; |
| double dst_x0, dst_y0, dst_x1, dst_y1; |
| SDL_Rect final_src, final_dst; |
| double scaling_w, scaling_h; |
| int src_w, src_h; |
| int dst_w, dst_h; |
| |
| /* Make sure the surfaces aren't locked */ |
| if (src == NULL || dst == NULL) { |
| return SDL_InvalidParamError("SDL_UpperBlitScaled(): src/dst"); |
| } |
| if (src->locked || dst->locked) { |
| return SDL_SetError("Surfaces must not be locked during blit"); |
| } |
| |
| if (srcrect == NULL) { |
| src_w = src->w; |
| src_h = src->h; |
| } else { |
| src_w = srcrect->w; |
| src_h = srcrect->h; |
| } |
| |
| if (dstrect == NULL) { |
| dst_w = dst->w; |
| dst_h = dst->h; |
| } else { |
| dst_w = dstrect->w; |
| dst_h = dstrect->h; |
| } |
| |
| if (dst_w == src_w && dst_h == src_h) { |
| /* No scaling, defer to regular blit */ |
| return SDL_BlitSurface(src, srcrect, dst, dstrect); |
| } |
| |
| scaling_w = (double)dst_w / src_w; |
| scaling_h = (double)dst_h / src_h; |
| |
| if (dstrect == NULL) { |
| dst_x0 = 0; |
| dst_y0 = 0; |
| dst_x1 = dst_w; |
| dst_y1 = dst_h; |
| } else { |
| dst_x0 = dstrect->x; |
| dst_y0 = dstrect->y; |
| dst_x1 = dst_x0 + dst_w; |
| dst_y1 = dst_y0 + dst_h; |
| } |
| |
| if (srcrect == NULL) { |
| src_x0 = 0; |
| src_y0 = 0; |
| src_x1 = src_w; |
| src_y1 = src_h; |
| } else { |
| src_x0 = srcrect->x; |
| src_y0 = srcrect->y; |
| src_x1 = src_x0 + src_w; |
| src_y1 = src_y0 + src_h; |
| |
| /* Clip source rectangle to the source surface */ |
| |
| if (src_x0 < 0) { |
| dst_x0 -= src_x0 * scaling_w; |
| src_x0 = 0; |
| } |
| |
| if (src_x1 > src->w) { |
| dst_x1 -= (src_x1 - src->w) * scaling_w; |
| src_x1 = src->w; |
| } |
| |
| if (src_y0 < 0) { |
| dst_y0 -= src_y0 * scaling_h; |
| src_y0 = 0; |
| } |
| |
| if (src_y1 > src->h) { |
| dst_y1 -= (src_y1 - src->h) * scaling_h; |
| src_y1 = src->h; |
| } |
| } |
| |
| /* Clip destination rectangle to the clip rectangle */ |
| |
| /* Translate to clip space for easier calculations */ |
| dst_x0 -= dst->clip_rect.x; |
| dst_x1 -= dst->clip_rect.x; |
| dst_y0 -= dst->clip_rect.y; |
| dst_y1 -= dst->clip_rect.y; |
| |
| if (dst_x0 < 0) { |
| src_x0 -= dst_x0 / scaling_w; |
| dst_x0 = 0; |
| } |
| |
| if (dst_x1 > dst->clip_rect.w) { |
| src_x1 -= (dst_x1 - dst->clip_rect.w) / scaling_w; |
| dst_x1 = dst->clip_rect.w; |
| } |
| |
| if (dst_y0 < 0) { |
| src_y0 -= dst_y0 / scaling_h; |
| dst_y0 = 0; |
| } |
| |
| if (dst_y1 > dst->clip_rect.h) { |
| src_y1 -= (dst_y1 - dst->clip_rect.h) / scaling_h; |
| dst_y1 = dst->clip_rect.h; |
| } |
| |
| /* Translate back to surface coordinates */ |
| dst_x0 += dst->clip_rect.x; |
| dst_x1 += dst->clip_rect.x; |
| dst_y0 += dst->clip_rect.y; |
| dst_y1 += dst->clip_rect.y; |
| |
| final_src.x = (int)SDL_round(src_x0); |
| final_src.y = (int)SDL_round(src_y0); |
| final_src.w = (int)SDL_round(src_x1 - src_x0); |
| final_src.h = (int)SDL_round(src_y1 - src_y0); |
| |
| final_dst.x = (int)SDL_round(dst_x0); |
| final_dst.y = (int)SDL_round(dst_y0); |
| final_dst.w = (int)SDL_round(dst_x1 - dst_x0); |
| final_dst.h = (int)SDL_round(dst_y1 - dst_y0); |
| |
| /* Clip again */ |
| { |
| SDL_Rect tmp; |
| tmp.x = 0; |
| tmp.y = 0; |
| tmp.w = src->w; |
| tmp.h = src->h; |
| SDL_IntersectRect(&tmp, &final_src, &final_src); |
| } |
| |
| /* Clip again */ |
| SDL_IntersectRect(&dst->clip_rect, &final_dst, &final_dst); |
| |
| if (dstrect) { |
| *dstrect = final_dst; |
| } |
| |
| if (final_dst.w == 0 || final_dst.h == 0 || |
| final_src.w <= 0 || final_src.h <= 0) { |
| /* No-op. */ |
| return 0; |
| } |
| |
| return SDL_PrivateLowerBlitScaled(src, &final_src, dst, &final_dst, scaleMode); |
| } |
| |
| /** |
| * This is a semi-private blit function and it performs low-level surface |
| * scaled blitting only. |
| */ |
| int SDL_LowerBlitScaled(SDL_Surface *src, SDL_Rect *srcrect, |
| SDL_Surface *dst, SDL_Rect *dstrect) |
| { |
| return SDL_PrivateLowerBlitScaled(src, srcrect, dst, dstrect, SDL_ScaleModeNearest); |
| } |
| |
| int SDL_PrivateLowerBlitScaled(SDL_Surface *src, SDL_Rect *srcrect, |
| SDL_Surface *dst, SDL_Rect *dstrect, SDL_ScaleMode scaleMode) |
| { |
| static const Uint32 complex_copy_flags = (SDL_COPY_MODULATE_COLOR | SDL_COPY_MODULATE_ALPHA | |
| SDL_COPY_BLEND | SDL_COPY_ADD | SDL_COPY_MOD | SDL_COPY_MUL | |
| SDL_COPY_COLORKEY); |
| |
| if (srcrect->w > SDL_MAX_UINT16 || srcrect->h > SDL_MAX_UINT16 || |
| dstrect->w > SDL_MAX_UINT16 || dstrect->h > SDL_MAX_UINT16) { |
| return SDL_SetError("Size too large for scaling"); |
| } |
| |
| if (!(src->map->info.flags & SDL_COPY_NEAREST)) { |
| src->map->info.flags |= SDL_COPY_NEAREST; |
| SDL_InvalidateMap(src->map); |
| } |
| |
| if (scaleMode == SDL_ScaleModeNearest) { |
| if (!(src->map->info.flags & complex_copy_flags) && |
| src->format->format == dst->format->format && |
| !SDL_ISPIXELFORMAT_INDEXED(src->format->format)) { |
| return SDL_SoftStretch(src, srcrect, dst, dstrect); |
| } else { |
| return SDL_LowerBlit(src, srcrect, dst, dstrect); |
| } |
| } else { |
| if (!(src->map->info.flags & complex_copy_flags) && |
| src->format->format == dst->format->format && |
| !SDL_ISPIXELFORMAT_INDEXED(src->format->format) && |
| src->format->BytesPerPixel == 4 && |
| src->format->format != SDL_PIXELFORMAT_ARGB2101010) { |
| /* fast path */ |
| return SDL_SoftStretchLinear(src, srcrect, dst, dstrect); |
| } else { |
| /* Use intermediate surface(s) */ |
| SDL_Surface *tmp1 = NULL; |
| int ret; |
| SDL_Rect srcrect2; |
| int is_complex_copy_flags = (src->map->info.flags & complex_copy_flags); |
| |
| Uint32 flags; |
| Uint8 r, g, b; |
| Uint8 alpha; |
| SDL_BlendMode blendMode; |
| |
| /* Save source infos */ |
| flags = src->flags; |
| SDL_GetSurfaceColorMod(src, &r, &g, &b); |
| SDL_GetSurfaceAlphaMod(src, &alpha); |
| SDL_GetSurfaceBlendMode(src, &blendMode); |
| srcrect2.x = srcrect->x; |
| srcrect2.y = srcrect->y; |
| srcrect2.w = srcrect->w; |
| srcrect2.h = srcrect->h; |
| |
| /* Change source format if not appropriate for scaling */ |
| if (src->format->BytesPerPixel != 4 || src->format->format == SDL_PIXELFORMAT_ARGB2101010) { |
| SDL_Rect tmprect; |
| int fmt; |
| tmprect.x = 0; |
| tmprect.y = 0; |
| tmprect.w = src->w; |
| tmprect.h = src->h; |
| if (dst->format->BytesPerPixel == 4 && dst->format->format != SDL_PIXELFORMAT_ARGB2101010) { |
| fmt = dst->format->format; |
| } else { |
| fmt = SDL_PIXELFORMAT_ARGB8888; |
| } |
| tmp1 = SDL_CreateRGBSurfaceWithFormat(flags, src->w, src->h, 0, fmt); |
| SDL_LowerBlit(src, srcrect, tmp1, &tmprect); |
| |
| srcrect2.x = 0; |
| srcrect2.y = 0; |
| SDL_SetSurfaceColorMod(tmp1, r, g, b); |
| SDL_SetSurfaceAlphaMod(tmp1, alpha); |
| SDL_SetSurfaceBlendMode(tmp1, blendMode); |
| |
| src = tmp1; |
| } |
| |
| /* Intermediate scaling */ |
| if (is_complex_copy_flags || src->format->format != dst->format->format) { |
| SDL_Rect tmprect; |
| SDL_Surface *tmp2 = SDL_CreateRGBSurfaceWithFormat(flags, dstrect->w, dstrect->h, 0, src->format->format); |
| SDL_SoftStretchLinear(src, &srcrect2, tmp2, NULL); |
| |
| SDL_SetSurfaceColorMod(tmp2, r, g, b); |
| SDL_SetSurfaceAlphaMod(tmp2, alpha); |
| SDL_SetSurfaceBlendMode(tmp2, blendMode); |
| |
| tmprect.x = 0; |
| tmprect.y = 0; |
| tmprect.w = dstrect->w; |
| tmprect.h = dstrect->h; |
| ret = SDL_LowerBlit(tmp2, &tmprect, dst, dstrect); |
| SDL_FreeSurface(tmp2); |
| } else { |
| ret = SDL_SoftStretchLinear(src, &srcrect2, dst, dstrect); |
| } |
| |
| SDL_FreeSurface(tmp1); |
| return ret; |
| } |
| } |
| } |
| |
| /* |
| * Lock a surface to directly access the pixels |
| */ |
| int SDL_LockSurface(SDL_Surface *surface) |
| { |
| if (!surface->locked) { |
| #if SDL_HAVE_RLE |
| /* Perform the lock */ |
| if (surface->flags & SDL_RLEACCEL) { |
| SDL_UnRLESurface(surface, 1); |
| surface->flags |= SDL_RLEACCEL; /* save accel'd state */ |
| } |
| #endif |
| } |
| |
| /* Increment the surface lock count, for recursive locks */ |
| ++surface->locked; |
| |
| /* Ready to go.. */ |
| return 0; |
| } |
| |
| /* |
| * Unlock a previously locked surface |
| */ |
| void SDL_UnlockSurface(SDL_Surface *surface) |
| { |
| /* Only perform an unlock if we are locked */ |
| if (!surface->locked || (--surface->locked > 0)) { |
| return; |
| } |
| |
| #if SDL_HAVE_RLE |
| /* Update RLE encoded surface with new data */ |
| if ((surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL) { |
| surface->flags &= ~SDL_RLEACCEL; /* stop lying */ |
| SDL_RLESurface(surface); |
| } |
| #endif |
| } |
| |
| /* |
| * Creates a new surface identical to the existing surface |
| */ |
| SDL_Surface *SDL_DuplicateSurface(SDL_Surface *surface) |
| { |
| return SDL_ConvertSurface(surface, surface->format, surface->flags); |
| } |
| |
| /* |
| * Convert a surface into the specified pixel format. |
| */ |
| SDL_Surface *SDL_ConvertSurface(SDL_Surface * surface, const SDL_PixelFormat * format, |
| Uint32 flags) |
| { |
| SDL_Surface *convert; |
| Uint32 copy_flags; |
| SDL_Color copy_color; |
| SDL_Rect bounds; |
| int ret; |
| SDL_bool palette_ck_transform = SDL_FALSE; |
| int palette_ck_value = 0; |
| SDL_bool palette_has_alpha = SDL_FALSE; |
| Uint8 *palette_saved_alpha = NULL; |
| int palette_saved_alpha_ncolors = 0; |
| |
| if (surface == NULL) { |
| SDL_InvalidParamError("surface"); |
| return NULL; |
| } |
| if (format == NULL) { |
| SDL_InvalidParamError("format"); |
| return NULL; |
| } |
| |
| /* Check for empty destination palette! (results in empty image) */ |
| if (format->palette != NULL) { |
| int i; |
| for (i = 0; i < format->palette->ncolors; ++i) { |
| if ((format->palette->colors[i].r != 0xFF) || (format->palette->colors[i].g != 0xFF) || (format->palette->colors[i].b != 0xFF)) { |
| break; |
| } |
| } |
| if (i == format->palette->ncolors) { |
| SDL_SetError("Empty destination palette"); |
| return NULL; |
| } |
| } |
| |
| /* Create a new surface with the desired format */ |
| convert = SDL_CreateRGBSurface(flags, surface->w, surface->h, |
| format->BitsPerPixel, format->Rmask, |
| format->Gmask, format->Bmask, |
| format->Amask); |
| if (convert == NULL) { |
| return NULL; |
| } |
| |
| /* Copy the palette if any */ |
| if (format->palette && convert->format->palette) { |
| SDL_memcpy(convert->format->palette->colors, |
| format->palette->colors, |
| format->palette->ncolors * sizeof(SDL_Color)); |
| convert->format->palette->ncolors = format->palette->ncolors; |
| } |
| |
| /* Save the original copy flags */ |
| copy_flags = surface->map->info.flags; |
| copy_color.r = surface->map->info.r; |
| copy_color.g = surface->map->info.g; |
| copy_color.b = surface->map->info.b; |
| copy_color.a = surface->map->info.a; |
| surface->map->info.r = 0xFF; |
| surface->map->info.g = 0xFF; |
| surface->map->info.b = 0xFF; |
| surface->map->info.a = 0xFF; |
| surface->map->info.flags = (copy_flags & (SDL_COPY_RLE_COLORKEY | SDL_COPY_RLE_ALPHAKEY)); |
| SDL_InvalidateMap(surface->map); |
| |
| /* Copy over the image data */ |
| bounds.x = 0; |
| bounds.y = 0; |
| bounds.w = surface->w; |
| bounds.h = surface->h; |
| |
| /* Source surface has a palette with no real alpha (0 or OPAQUE). |
| * Destination format has alpha. |
| * -> set alpha channel to be opaque */ |
| if (surface->format->palette && format->Amask) { |
| SDL_bool set_opaque = SDL_FALSE; |
| |
| SDL_bool is_opaque, has_alpha_channel; |
| SDL_DetectPalette(surface->format->palette, &is_opaque, &has_alpha_channel); |
| |
| if (is_opaque) { |
| if (!has_alpha_channel) { |
| set_opaque = SDL_TRUE; |
| } |
| } else { |
| palette_has_alpha = SDL_TRUE; |
| } |
| |
| /* Set opaque and backup palette alpha values */ |
| if (set_opaque) { |
| int i; |
| palette_saved_alpha_ncolors = surface->format->palette->ncolors; |
| palette_saved_alpha = SDL_stack_alloc(Uint8, palette_saved_alpha_ncolors); |
| for (i = 0; i < palette_saved_alpha_ncolors; i++) { |
| palette_saved_alpha[i] = surface->format->palette->colors[i].a; |
| surface->format->palette->colors[i].a = SDL_ALPHA_OPAQUE; |
| } |
| } |
| } |
| |
| /* Transform colorkey to alpha. for cases where source palette has duplicate values, and colorkey is one of them */ |
| if (copy_flags & SDL_COPY_COLORKEY) { |
| if (surface->format->palette && !format->palette) { |
| palette_ck_transform = SDL_TRUE; |
| palette_has_alpha = SDL_TRUE; |
| palette_ck_value = surface->format->palette->colors[surface->map->info.colorkey].a; |
| surface->format->palette->colors[surface->map->info.colorkey].a = SDL_ALPHA_TRANSPARENT; |
| } |
| } |
| |
| ret = SDL_LowerBlit(surface, &bounds, convert, &bounds); |
| |
| /* Restore colorkey alpha value */ |
| if (palette_ck_transform) { |
| surface->format->palette->colors[surface->map->info.colorkey].a = palette_ck_value; |
| } |
| |
| /* Restore palette alpha values */ |
| if (palette_saved_alpha) { |
| int i; |
| for (i = 0; i < palette_saved_alpha_ncolors; i++) { |
| surface->format->palette->colors[i].a = palette_saved_alpha[i]; |
| } |
| SDL_stack_free(palette_saved_alpha); |
| } |
| |
| /* Clean up the original surface, and update converted surface */ |
| convert->map->info.r = copy_color.r; |
| convert->map->info.g = copy_color.g; |
| convert->map->info.b = copy_color.b; |
| convert->map->info.a = copy_color.a; |
| convert->map->info.flags = |
| (copy_flags & |
| ~(SDL_COPY_COLORKEY | SDL_COPY_BLEND | SDL_COPY_RLE_DESIRED | SDL_COPY_RLE_COLORKEY | |
| SDL_COPY_RLE_ALPHAKEY)); |
| surface->map->info.r = copy_color.r; |
| surface->map->info.g = copy_color.g; |
| surface->map->info.b = copy_color.b; |
| surface->map->info.a = copy_color.a; |
| surface->map->info.flags = copy_flags; |
| SDL_InvalidateMap(surface->map); |
| |
| /* SDL_LowerBlit failed, and so the conversion */ |
| if (ret < 0) { |
| SDL_FreeSurface(convert); |
| return NULL; |
| } |
| |
| if (copy_flags & SDL_COPY_COLORKEY) { |
| SDL_bool set_colorkey_by_color = SDL_FALSE; |
| SDL_bool convert_colorkey = SDL_TRUE; |
| |
| if (surface->format->palette) { |
| if (format->palette && |
| surface->format->palette->ncolors <= format->palette->ncolors && |
| (SDL_memcmp(surface->format->palette->colors, format->palette->colors, |
| surface->format->palette->ncolors * sizeof(SDL_Color)) == 0)) { |
| /* The palette is identical, just set the same colorkey */ |
| SDL_SetColorKey(convert, 1, surface->map->info.colorkey); |
| } else if (!format->palette) { |
| if (format->Amask) { |
| /* No need to add the colorkey, transparency is in the alpha channel*/ |
| } else { |
| /* Only set the colorkey information */ |
| set_colorkey_by_color = SDL_TRUE; |
| convert_colorkey = SDL_FALSE; |
| } |
| } else { |
| set_colorkey_by_color = SDL_TRUE; |
| } |
| } else { |
| set_colorkey_by_color = SDL_TRUE; |
| } |
| |
| if (set_colorkey_by_color) { |
| SDL_Surface *tmp; |
| SDL_Surface *tmp2; |
| int converted_colorkey = 0; |
| |
| /* Create a dummy surface to get the colorkey converted */ |
| tmp = SDL_CreateRGBSurface(0, 1, 1, |
| surface->format->BitsPerPixel, surface->format->Rmask, |
| surface->format->Gmask, surface->format->Bmask, |
| surface->format->Amask); |
| |
| /* Share the palette, if any */ |
| if (surface->format->palette) { |
| SDL_SetSurfacePalette(tmp, surface->format->palette); |
| } |
| |
| SDL_FillRect(tmp, NULL, surface->map->info.colorkey); |
| |
| tmp->map->info.flags &= ~SDL_COPY_COLORKEY; |
| |
| /* Convertion of the colorkey */ |
| tmp2 = SDL_ConvertSurface(tmp, format, 0); |
| |
| /* Get the converted colorkey */ |
| SDL_memcpy(&converted_colorkey, tmp2->pixels, tmp2->format->BytesPerPixel); |
| |
| SDL_FreeSurface(tmp); |
| SDL_FreeSurface(tmp2); |
| |
| /* Set the converted colorkey on the new surface */ |
| SDL_SetColorKey(convert, 1, converted_colorkey); |
| |
| /* This is needed when converting for 3D texture upload */ |
| if (convert_colorkey) { |
| SDL_ConvertColorkeyToAlpha(convert, SDL_TRUE); |
| } |
| } |
| } |
| SDL_SetClipRect(convert, &surface->clip_rect); |
| |
| /* Enable alpha blending by default if the new surface has an |
| * alpha channel or alpha modulation */ |
| if ((surface->format->Amask && format->Amask) || |
| (palette_has_alpha && format->Amask) || |
| (copy_flags & SDL_COPY_MODULATE_ALPHA)) { |
| SDL_SetSurfaceBlendMode(convert, SDL_BLENDMODE_BLEND); |
| } |
| if ((copy_flags & SDL_COPY_RLE_DESIRED) || (flags & SDL_RLEACCEL)) { |
| SDL_SetSurfaceRLE(convert, SDL_RLEACCEL); |
| } |
| |
| /* We're ready to go! */ |
| return convert; |
| } |
| |
| SDL_Surface *SDL_ConvertSurfaceFormat(SDL_Surface * surface, Uint32 pixel_format, |
| Uint32 flags) |
| { |
| SDL_PixelFormat *fmt; |
| SDL_Surface *convert = NULL; |
| |
| fmt = SDL_AllocFormat(pixel_format); |
| if (fmt) { |
| convert = SDL_ConvertSurface(surface, fmt, flags); |
| SDL_FreeFormat(fmt); |
| } |
| return convert; |
| } |
| |
| /* |
| * Create a surface on the stack for quick blit operations |
| */ |
| static SDL_INLINE SDL_bool SDL_CreateSurfaceOnStack(int width, int height, Uint32 pixel_format, |
| void *pixels, int pitch, SDL_Surface *surface, |
| SDL_PixelFormat *format, SDL_BlitMap *blitmap) |
| { |
| if (SDL_ISPIXELFORMAT_INDEXED(pixel_format)) { |
| SDL_SetError("Indexed pixel formats not supported"); |
| return SDL_FALSE; |
| } |
| if (SDL_InitFormat(format, pixel_format) < 0) { |
| return SDL_FALSE; |
| } |
| |
| SDL_zerop(surface); |
| surface->flags = SDL_PREALLOC; |
| surface->format = format; |
| surface->pixels = pixels; |
| surface->w = width; |
| surface->h = height; |
| surface->pitch = pitch; |
| /* We don't actually need to set up the clip rect for our purposes */ |
| /* SDL_SetClipRect(surface, NULL); */ |
| |
| /* Allocate an empty mapping */ |
| SDL_zerop(blitmap); |
| blitmap->info.r = 0xFF; |
| blitmap->info.g = 0xFF; |
| blitmap->info.b = 0xFF; |
| blitmap->info.a = 0xFF; |
| surface->map = blitmap; |
| |
| /* The surface is ready to go */ |
| surface->refcount = 1; |
| return SDL_TRUE; |
| } |
| |
| /* |
| * Copy a block of pixels of one format to another format |
| */ |
| int SDL_ConvertPixels(int width, int height, |
| Uint32 src_format, const void *src, int src_pitch, |
| Uint32 dst_format, void *dst, int dst_pitch) |
| { |
| SDL_Surface src_surface, dst_surface; |
| SDL_PixelFormat src_fmt, dst_fmt; |
| SDL_BlitMap src_blitmap, dst_blitmap; |
| SDL_Rect rect; |
| void *nonconst_src = (void *)src; |
| int ret; |
| |
| if (src == NULL) { |
| return SDL_InvalidParamError("src"); |
| } |
| if (!src_pitch) { |
| return SDL_InvalidParamError("src_pitch"); |
| } |
| if (dst == NULL) { |
| return SDL_InvalidParamError("dst"); |
| } |
| if (!dst_pitch) { |
| return SDL_InvalidParamError("dst_pitch"); |
| } |
| |
| #if SDL_HAVE_YUV |
| if (SDL_ISPIXELFORMAT_FOURCC(src_format) && SDL_ISPIXELFORMAT_FOURCC(dst_format)) { |
| return SDL_ConvertPixels_YUV_to_YUV(width, height, src_format, src, src_pitch, dst_format, dst, dst_pitch); |
| } else if (SDL_ISPIXELFORMAT_FOURCC(src_format)) { |
| return SDL_ConvertPixels_YUV_to_RGB(width, height, src_format, src, src_pitch, dst_format, dst, dst_pitch); |
| } else if (SDL_ISPIXELFORMAT_FOURCC(dst_format)) { |
| return SDL_ConvertPixels_RGB_to_YUV(width, height, src_format, src, src_pitch, dst_format, dst, dst_pitch); |
| } |
| #else |
| if (SDL_ISPIXELFORMAT_FOURCC(src_format) || SDL_ISPIXELFORMAT_FOURCC(dst_format)) { |
| return SDL_SetError("SDL not built with YUV support"); |
| } |
| #endif |
| |
| /* Fast path for same format copy */ |
| if (src_format == dst_format) { |
| int i; |
| const int bpp = SDL_BYTESPERPIXEL(src_format); |
| width *= bpp; |
| for (i = height; i--;) { |
| SDL_memcpy(dst, src, width); |
| src = (const Uint8 *)src + src_pitch; |
| dst = (Uint8 *)dst + dst_pitch; |
| } |
| return 0; |
| } |
| |
| if (!SDL_CreateSurfaceOnStack(width, height, src_format, nonconst_src, |
| src_pitch, |
| &src_surface, &src_fmt, &src_blitmap)) { |
| return -1; |
| } |
| if (!SDL_CreateSurfaceOnStack(width, height, dst_format, dst, dst_pitch, |
| &dst_surface, &dst_fmt, &dst_blitmap)) { |
| return -1; |
| } |
| |
| /* Set up the rect and go! */ |
| rect.x = 0; |
| rect.y = 0; |
| rect.w = width; |
| rect.h = height; |
| ret = SDL_LowerBlit(&src_surface, &rect, &dst_surface, &rect); |
| |
| /* Free blitmap reference, after blitting between stack'ed surfaces */ |
| SDL_InvalidateMap(src_surface.map); |
| |
| return ret; |
| } |
| |
| /* |
| * Premultiply the alpha on a block of pixels |
| * |
| * This is currently only implemented for SDL_PIXELFORMAT_ARGB8888 |
| * |
| * Here are some ideas for optimization: |
| * https://github.com/Wizermil/premultiply_alpha/tree/master/premultiply_alpha |
| * https://developer.arm.com/documentation/101964/0201/Pre-multiplied-alpha-channel-data |
| */ |
| int SDL_PremultiplyAlpha(int width, int height, |
| Uint32 src_format, const void *src, int src_pitch, |
| Uint32 dst_format, void *dst, int dst_pitch) |
| { |
| int c; |
| Uint32 srcpixel; |
| Uint32 srcR, srcG, srcB, srcA; |
| Uint32 dstpixel; |
| Uint32 dstR, dstG, dstB, dstA; |
| |
| if (src == NULL) { |
| return SDL_InvalidParamError("src"); |
| } |
| if (!src_pitch) { |
| return SDL_InvalidParamError("src_pitch"); |
| } |
| if (dst == NULL) { |
| return SDL_InvalidParamError("dst"); |
| } |
| if (!dst_pitch) { |
| return SDL_InvalidParamError("dst_pitch"); |
| } |
| if (src_format != SDL_PIXELFORMAT_ARGB8888) { |
| return SDL_InvalidParamError("src_format"); |
| } |
| if (dst_format != SDL_PIXELFORMAT_ARGB8888) { |
| return SDL_InvalidParamError("dst_format"); |
| } |
| |
| while (height--) { |
| const Uint32 *src_px = (const Uint32 *)src; |
| Uint32 *dst_px = (Uint32 *)dst; |
| for (c = width; c; --c) { |
| /* Component bytes extraction. */ |
| srcpixel = *src_px++; |
| RGBA_FROM_ARGB8888(srcpixel, srcR, srcG, srcB, srcA); |
| |
| /* Alpha pre-multiplication of each component. */ |
| dstA = srcA; |
| dstR = (srcA * srcR) / 255; |
| dstG = (srcA * srcG) / 255; |
| dstB = (srcA * srcB) / 255; |
| |
| /* ARGB8888 pixel recomposition. */ |
| ARGB8888_FROM_RGBA(dstpixel, dstR, dstG, dstB, dstA); |
| *dst_px++ = dstpixel; |
| } |
| src = (const Uint8 *)src + src_pitch; |
| dst = (Uint8 *)dst + dst_pitch; |
| } |
| return 0; |
| } |
| |
| /* |
| * Free a surface created by the above function. |
| */ |
| void SDL_FreeSurface(SDL_Surface *surface) |
| { |
| if (surface == NULL) { |
| return; |
| } |
| if (surface->flags & SDL_DONTFREE) { |
| return; |
| } |
| SDL_InvalidateMap(surface->map); |
| |
| SDL_InvalidateAllBlitMap(surface); |
| |
| if (--surface->refcount > 0) { |
| return; |
| } |
| while (surface->locked > 0) { |
| SDL_UnlockSurface(surface); |
| } |
| #if SDL_HAVE_RLE |
| if (surface->flags & SDL_RLEACCEL) { |
| SDL_UnRLESurface(surface, 0); |
| } |
| #endif |
| if (surface->format) { |
| SDL_SetSurfacePalette(surface, NULL); |
| SDL_FreeFormat(surface->format); |
| surface->format = NULL; |
| } |
| if (surface->flags & SDL_PREALLOC) { |
| /* Don't free */ |
| } else if (surface->flags & SDL_SIMD_ALIGNED) { |
| /* Free aligned */ |
| SDL_SIMDFree(surface->pixels); |
| } else { |
| /* Normal */ |
| SDL_free(surface->pixels); |
| } |
| if (surface->map) { |
| SDL_FreeBlitMap(surface->map); |
| } |
| SDL_free(surface); |
| } |
| |
| /* vi: set ts=4 sw=4 expandtab: */ |
