| /* |
| Simple DirectMedia Layer |
| Copyright (C) 1997-2016 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" |
| |
| /* Public routines */ |
| /* |
| * 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) |
| { |
| SDL_Surface *surface; |
| Uint32 format; |
| |
| /* The flags are no longer used, make the compiler happy */ |
| (void)flags; |
| |
| /* Get the pixel format */ |
| format = SDL_MasksToPixelFormatEnum(depth, Rmask, Gmask, Bmask, Amask); |
| if (format == SDL_PIXELFORMAT_UNKNOWN) { |
| SDL_SetError("Unknown pixel format"); |
| 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 = SDL_CalculatePitch(surface); |
| SDL_SetClipRect(surface, NULL); |
| |
| if (SDL_ISPIXELFORMAT_INDEXED(surface->format->format)) { |
| SDL_Palette *palette = |
| SDL_AllocPalette((1 << surface->format->BitsPerPixel)); |
| if (!palette) { |
| 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) { |
| surface->pixels = SDL_malloc(surface->h * surface->pitch); |
| if (!surface->pixels) { |
| SDL_FreeSurface(surface); |
| SDL_OutOfMemory(); |
| return NULL; |
| } |
| /* This is important for bitmaps */ |
| SDL_memset(surface->pixels, 0, surface->h * surface->pitch); |
| } |
| |
| /* 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 (Amask) { |
| SDL_SetSurfaceBlendMode(surface, SDL_BLENDMODE_BLEND); |
| } |
| |
| /* The surface is ready to go */ |
| surface->refcount = 1; |
| return surface; |
| } |
| |
| /* |
| * 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; |
| |
| surface = |
| SDL_CreateRGBSurface(0, 0, 0, depth, Rmask, Gmask, Bmask, Amask); |
| 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) { |
| return SDL_SetError("SDL_SetSurfacePalette() passed a NULL 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) { |
| 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; |
| } |
| |
| int |
| SDL_SetColorKey(SDL_Surface * surface, int flag, Uint32 key) |
| { |
| int flags; |
| |
| if (!surface) { |
| 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; |
| if (surface->format->palette) { |
| surface->format->palette->colors[surface->map->info.colorkey].a = SDL_ALPHA_TRANSPARENT; |
| ++surface->format->palette->version; |
| if (!surface->format->palette->version) { |
| surface->format->palette->version = 1; |
| } |
| } |
| } else { |
| if (surface->format->palette) { |
| surface->format->palette->colors[surface->map->info.colorkey].a = SDL_ALPHA_OPAQUE; |
| ++surface->format->palette->version; |
| if (!surface->format->palette->version) { |
| surface->format->palette->version = 1; |
| } |
| } |
| surface->map->info.flags &= ~SDL_COPY_COLORKEY; |
| } |
| if (surface->map->info.flags != flags) { |
| SDL_InvalidateMap(surface->map); |
| } |
| |
| return 0; |
| } |
| |
| int |
| SDL_GetColorKey(SDL_Surface * surface, Uint32 * key) |
| { |
| if (!surface) { |
| return -1; |
| } |
| |
| if (!(surface->map->info.flags & SDL_COPY_COLORKEY)) { |
| return -1; |
| } |
| |
| if (key) { |
| *key = surface->map->info.colorkey; |
| } |
| return 0; |
| } |
| |
| /* This is a fairly slow function to switch from colorkey to alpha */ |
| static void |
| SDL_ConvertColorkeyToAlpha(SDL_Surface * surface) |
| { |
| int x, y; |
| |
| if (!surface) { |
| return; |
| } |
| |
| if (!(surface->map->info.flags & SDL_COPY_COLORKEY) || |
| !surface->format->Amask) { |
| return; |
| } |
| |
| SDL_LockSurface(surface); |
| |
| switch (surface->format->BytesPerPixel) { |
| case 2: |
| { |
| Uint16 *row, *spot; |
| Uint16 ckey = (Uint16) surface->map->info.colorkey; |
| Uint16 mask = (Uint16) (~surface->format->Amask); |
| |
| /* Ignore alpha in colorkey comparison */ |
| 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; |
| } |
| } |
| break; |
| case 3: |
| /* FIXME */ |
| break; |
| case 4: |
| { |
| Uint32 *row, *spot; |
| Uint32 ckey = surface->map->info.colorkey; |
| Uint32 mask = ~surface->format->Amask; |
| |
| /* Ignore alpha in colorkey comparison */ |
| 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; |
| } |
| } |
| break; |
| } |
| |
| 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) { |
| 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) { |
| 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) { |
| 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) { |
| 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) { |
| return -1; |
| } |
| |
| status = 0; |
| flags = surface->map->info.flags; |
| surface->map->info.flags &= |
| ~(SDL_COPY_BLEND | SDL_COPY_ADD | SDL_COPY_MOD); |
| 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; |
| 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) { |
| return -1; |
| } |
| |
| if (!blendMode) { |
| return 0; |
| } |
| |
| switch (surface->map-> |
| info.flags & (SDL_COPY_BLEND | SDL_COPY_ADD | SDL_COPY_MOD)) { |
| 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; |
| 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) { |
| 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) { |
| 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 || !dst) { |
| return SDL_SetError("SDL_UpperBlit: passed a NULL surface"); |
| } |
| 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) |
| { |
| 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 || !dst) { |
| return SDL_SetError("SDL_UpperBlitScaled: passed a NULL surface"); |
| } |
| if (src->locked || dst->locked) { |
| return SDL_SetError("Surfaces must not be locked during blit"); |
| } |
| |
| if (NULL == srcrect) { |
| src_w = src->w; |
| src_h = src->h; |
| } else { |
| src_w = srcrect->w; |
| src_h = srcrect->h; |
| } |
| |
| if (NULL == dstrect) { |
| 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 (NULL == dstrect) { |
| dst_x0 = 0; |
| dst_y0 = 0; |
| dst_x1 = dst_w - 1; |
| dst_y1 = dst_h - 1; |
| } else { |
| dst_x0 = dstrect->x; |
| dst_y0 = dstrect->y; |
| dst_x1 = dst_x0 + dst_w - 1; |
| dst_y1 = dst_y0 + dst_h - 1; |
| } |
| |
| if (NULL == srcrect) { |
| src_x0 = 0; |
| src_y0 = 0; |
| src_x1 = src_w - 1; |
| src_y1 = src_h - 1; |
| } else { |
| src_x0 = srcrect->x; |
| src_y0 = srcrect->y; |
| src_x1 = src_x0 + src_w - 1; |
| src_y1 = src_y0 + src_h - 1; |
| |
| /* 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 + 1) * scaling_w; |
| src_x1 = src->w - 1; |
| } |
| |
| if (src_y0 < 0) { |
| dst_y0 -= src_y0 * scaling_h; |
| src_y0 = 0; |
| } |
| |
| if (src_y1 >= src->h) { |
| dst_y1 -= (src_y1 - src->h + 1) * scaling_h; |
| src_y1 = src->h - 1; |
| } |
| } |
| |
| /* 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 + 1) / scaling_w; |
| dst_x1 = dst->clip_rect.w - 1; |
| } |
| |
| 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 + 1) / scaling_h; |
| dst_y1 = dst->clip_rect.h - 1; |
| } |
| |
| /* 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_floor(src_x0 + 0.5); |
| final_src.y = (int)SDL_floor(src_y0 + 0.5); |
| final_src.w = (int)SDL_floor(src_x1 - src_x0 + 1.5); |
| final_src.h = (int)SDL_floor(src_y1 - src_y0 + 1.5); |
| |
| final_dst.x = (int)SDL_floor(dst_x0 + 0.5); |
| final_dst.y = (int)SDL_floor(dst_y0 + 0.5); |
| final_dst.w = (int)SDL_floor(dst_x1 - dst_x0 + 1.5); |
| final_dst.h = (int)SDL_floor(dst_y1 - dst_y0 + 1.5); |
| |
| if (final_dst.w < 0) |
| final_dst.w = 0; |
| if (final_dst.h < 0) |
| final_dst.h = 0; |
| |
| 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_LowerBlitScaled(src, &final_src, dst, &final_dst); |
| } |
| |
| /** |
| * 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) |
| { |
| 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_COLORKEY |
| ); |
| |
| if (!(src->map->info.flags & SDL_COPY_NEAREST)) { |
| src->map->info.flags |= SDL_COPY_NEAREST; |
| SDL_InvalidateMap(src->map); |
| } |
| |
| 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 ); |
| } |
| } |
| |
| /* |
| * Lock a surface to directly access the pixels |
| */ |
| int |
| SDL_LockSurface(SDL_Surface * surface) |
| { |
| if (!surface->locked) { |
| /* Perform the lock */ |
| if (surface->flags & SDL_RLEACCEL) { |
| SDL_UnRLESurface(surface, 1); |
| surface->flags |= SDL_RLEACCEL; /* save accel'd state */ |
| } |
| } |
| |
| /* 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; |
| } |
| |
| /* Update RLE encoded surface with new data */ |
| if ((surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL) { |
| surface->flags &= ~SDL_RLEACCEL; /* stop lying */ |
| SDL_RLESurface(surface); |
| } |
| } |
| |
| /* |
| * 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; |
| |
| /* 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 = 0; |
| SDL_InvalidateMap(surface->map); |
| |
| /* Copy over the image data */ |
| bounds.x = 0; |
| bounds.y = 0; |
| bounds.w = surface->w; |
| bounds.h = surface->h; |
| SDL_LowerBlit(surface, &bounds, convert, &bounds); |
| |
| /* 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); |
| if (copy_flags & SDL_COPY_COLORKEY) { |
| SDL_bool set_colorkey_by_color = SDL_FALSE; |
| |
| 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->Amask) { |
| /* The alpha was set in the destination from the palette */ |
| } else { |
| set_colorkey_by_color = SDL_TRUE; |
| } |
| } else { |
| set_colorkey_by_color = SDL_TRUE; |
| } |
| |
| if (set_colorkey_by_color) { |
| /* Set the colorkey by color, which needs to be unique */ |
| Uint8 keyR, keyG, keyB, keyA; |
| |
| SDL_GetRGBA(surface->map->info.colorkey, surface->format, &keyR, |
| &keyG, &keyB, &keyA); |
| SDL_SetColorKey(convert, 1, |
| SDL_MapRGBA(convert->format, keyR, keyG, keyB, keyA)); |
| /* This is needed when converting for 3D texture upload */ |
| SDL_ConvertColorkeyToAlpha(convert); |
| } |
| } |
| 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) || |
| (copy_flags & (SDL_COPY_COLORKEY|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; |
| |
| /* Check to make sure we are blitting somewhere, so we don't crash */ |
| if (!dst) { |
| return SDL_InvalidParamError("dst"); |
| } |
| if (!dst_pitch) { |
| return SDL_InvalidParamError("dst_pitch"); |
| } |
| |
| /* Fast path for same format copy */ |
| if (src_format == dst_format) { |
| int bpp, i; |
| |
| if (SDL_ISPIXELFORMAT_FOURCC(src_format)) { |
| switch (src_format) { |
| case SDL_PIXELFORMAT_YUY2: |
| case SDL_PIXELFORMAT_UYVY: |
| case SDL_PIXELFORMAT_YVYU: |
| bpp = 2; |
| break; |
| case SDL_PIXELFORMAT_YV12: |
| case SDL_PIXELFORMAT_IYUV: |
| case SDL_PIXELFORMAT_NV12: |
| case SDL_PIXELFORMAT_NV21: |
| bpp = 1; |
| break; |
| default: |
| return SDL_SetError("Unknown FOURCC pixel format"); |
| } |
| } else { |
| bpp = SDL_BYTESPERPIXEL(src_format); |
| } |
| width *= bpp; |
| |
| for (i = height; i--;) { |
| SDL_memcpy(dst, src, width); |
| src = (Uint8*)src + src_pitch; |
| dst = (Uint8*)dst + dst_pitch; |
| } |
| |
| if (src_format == SDL_PIXELFORMAT_YV12 || src_format == SDL_PIXELFORMAT_IYUV) { |
| /* U and V planes are a quarter the size of the Y plane */ |
| width /= 2; |
| height /= 2; |
| src_pitch /= 2; |
| dst_pitch /= 2; |
| for (i = height * 2; i--;) { |
| SDL_memcpy(dst, src, width); |
| src = (Uint8*)src + src_pitch; |
| dst = (Uint8*)dst + dst_pitch; |
| } |
| } else if (src_format == SDL_PIXELFORMAT_NV12 || src_format == SDL_PIXELFORMAT_NV21) { |
| /* U/V plane is half the height of the Y plane */ |
| height /= 2; |
| for (i = height; i--;) { |
| SDL_memcpy(dst, src, width); |
| src = (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; |
| return SDL_LowerBlit(&src_surface, &rect, &dst_surface, &rect); |
| } |
| |
| /* |
| * Free a surface created by the above function. |
| */ |
| void |
| SDL_FreeSurface(SDL_Surface * surface) |
| { |
| if (surface == NULL) { |
| return; |
| } |
| if (surface->flags & SDL_DONTFREE) { |
| return; |
| } |
| if (--surface->refcount > 0) { |
| return; |
| } |
| while (surface->locked > 0) { |
| SDL_UnlockSurface(surface); |
| } |
| if (surface->flags & SDL_RLEACCEL) { |
| SDL_UnRLESurface(surface, 0); |
| } |
| if (surface->format) { |
| SDL_SetSurfacePalette(surface, NULL); |
| SDL_FreeFormat(surface->format); |
| surface->format = NULL; |
| } |
| if (surface->map != NULL) { |
| SDL_FreeBlitMap(surface->map); |
| surface->map = NULL; |
| } |
| if (!(surface->flags & SDL_PREALLOC)) { |
| SDL_free(surface->pixels); |
| } |
| SDL_free(surface); |
| } |
| |
| /* vi: set ts=4 sw=4 expandtab: */ |
