slouken@0: /*
slouken@0:     SDL - Simple DirectMedia Layer
slouken@1312:     Copyright (C) 1997-2006 Sam Lantinga
slouken@0: 
slouken@0:     This library is free software; you can redistribute it and/or
slouken@1312:     modify it under the terms of the GNU Lesser General Public
slouken@0:     License as published by the Free Software Foundation; either
slouken@1312:     version 2.1 of the License, or (at your option) any later version.
slouken@0: 
slouken@0:     This library is distributed in the hope that it will be useful,
slouken@0:     but WITHOUT ANY WARRANTY; without even the implied warranty of
slouken@0:     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
slouken@1312:     Lesser General Public License for more details.
slouken@0: 
slouken@1312:     You should have received a copy of the GNU Lesser General Public
slouken@1312:     License along with this library; if not, write to the Free Software
slouken@1312:     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
slouken@0: 
slouken@0:     Sam Lantinga
slouken@252:     slouken@libsdl.org
slouken@0: */
slouken@1402: #include "SDL_config.h"
slouken@0: 
slouken@0: #include "SDL_video.h"
slouken@1895: #include "SDL_compat.h"
slouken@0: #include "SDL_sysvideo.h"
slouken@0: #include "SDL_blit.h"
slouken@0: #include "SDL_RLEaccel_c.h"
slouken@0: #include "SDL_pixels_c.h"
slouken@0: #include "SDL_leaks.h"
slouken@0: 
icculus@1251: 
slouken@0: /* Public routines */
slouken@0: /*
slouken@0:  * Create an empty RGB surface of the appropriate depth
slouken@0:  */
slouken@1895: SDL_Surface *
slouken@1895: SDL_CreateRGBSurface(Uint32 flags,
slouken@1895:                      int width, int height, int depth,
slouken@1895:                      Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask)
slouken@0: {
slouken@1895:     SDL_Surface *surface;
slouken@0: 
slouken@2807:     /* The flags are no longer used, make the compiler happy */
slouken@2807:     flags;
slouken@2807: 
slouken@1895:     /* Allocate the surface */
slouken@1920:     surface = (SDL_Surface *) SDL_calloc(1, sizeof(*surface));
slouken@1895:     if (surface == NULL) {
slouken@1895:         SDL_OutOfMemory();
slouken@1895:         return NULL;
slouken@1895:     }
slouken@940: 
slouken@1895:     surface->format = SDL_AllocFormat(depth, Rmask, Gmask, Bmask, Amask);
slouken@1895:     if (!surface->format) {
slouken@1895:         SDL_FreeSurface(surface);
slouken@1895:         return NULL;
slouken@1895:     }
slouken@1895:     surface->w = width;
slouken@1895:     surface->h = height;
slouken@1895:     surface->pitch = SDL_CalculatePitch(surface);
slouken@1895:     SDL_SetClipRect(surface, NULL);
slouken@0: 
slouken@1895:     if (surface->format->BitsPerPixel <= 8) {
slouken@1895:         SDL_Palette *palette =
slouken@1895:             SDL_AllocPalette((1 << surface->format->BitsPerPixel));
slouken@1895:         if (!palette) {
slouken@1895:             SDL_FreeSurface(surface);
slouken@1895:             return NULL;
slouken@1895:         }
slouken@1895:         if (Rmask || Bmask || Gmask) {
slouken@1895:             const SDL_PixelFormat *format = surface->format;
slouken@0: 
slouken@1895:             /* create palette according to masks */
slouken@1895:             int i;
slouken@1895:             int Rm = 0, Gm = 0, Bm = 0;
slouken@1895:             int Rw = 0, Gw = 0, Bw = 0;
slouken@0: 
slouken@1895:             if (Rmask) {
slouken@1895:                 Rw = 8 - format->Rloss;
slouken@1895:                 for (i = format->Rloss; i > 0; i -= Rw)
slouken@1895:                     Rm |= 1 << i;
slouken@1895:             }
slouken@1895:             if (Gmask) {
slouken@1895:                 Gw = 8 - format->Gloss;
slouken@1895:                 for (i = format->Gloss; i > 0; i -= Gw)
slouken@1895:                     Gm |= 1 << i;
slouken@1895:             }
slouken@1895:             if (Bmask) {
slouken@1895:                 Bw = 8 - format->Bloss;
slouken@1895:                 for (i = format->Bloss; i > 0; i -= Bw)
slouken@1895:                     Bm |= 1 << i;
slouken@1895:             }
slouken@1895:             for (i = 0; i < palette->ncolors; ++i) {
slouken@1895:                 int r, g, b;
slouken@1895:                 r = (i & Rmask) >> format->Rshift;
slouken@1895:                 r = (r << format->Rloss) | ((r * Rm) >> Rw);
slouken@1895:                 palette->colors[i].r = r;
slouken@0: 
slouken@1895:                 g = (i & Gmask) >> format->Gshift;
slouken@1895:                 g = (g << format->Gloss) | ((g * Gm) >> Gw);
slouken@1895:                 palette->colors[i].g = g;
slouken@1895: 
slouken@1895:                 b = (i & Bmask) >> format->Bshift;
slouken@1895:                 b = (b << format->Bloss) | ((b * Bm) >> Bw);
slouken@1895:                 palette->colors[i].b = b;
slouken@1895:             }
slouken@1895:         } else if (palette->ncolors == 2) {
slouken@1895:             /* Create a black and white bitmap palette */
slouken@1895:             palette->colors[0].r = 0xFF;
slouken@1895:             palette->colors[0].g = 0xFF;
slouken@1895:             palette->colors[0].b = 0xFF;
slouken@1895:             palette->colors[1].r = 0x00;
slouken@1895:             palette->colors[1].g = 0x00;
slouken@1895:             palette->colors[1].b = 0x00;
slouken@1895:         }
slouken@1895:         SDL_SetSurfacePalette(surface, palette);
slouken@1895:         SDL_FreePalette(palette);
slouken@1895:     }
slouken@1895: 
slouken@1895:     /* Get the pixels */
slouken@1895:     if (surface->w && surface->h) {
slouken@1895:         surface->pixels = SDL_malloc(surface->h * surface->pitch);
slouken@1895:         if (!surface->pixels) {
slouken@1895:             SDL_FreeSurface(surface);
slouken@1895:             SDL_OutOfMemory();
slouken@1895:             return NULL;
slouken@1895:         }
slouken@1895:         /* This is important for bitmaps */
slouken@1895:         SDL_memset(surface->pixels, 0, surface->h * surface->pitch);
slouken@1895:     }
slouken@1895: 
slouken@1895:     /* Allocate an empty mapping */
slouken@1895:     surface->map = SDL_AllocBlitMap();
slouken@1895:     if (!surface->map) {
slouken@1895:         SDL_FreeSurface(surface);
slouken@1895:         return NULL;
slouken@1895:     }
slouken@1895:     SDL_FormatChanged(surface);
slouken@1895: 
slouken@2267:     /* By default surface with an alpha mask are set up for blending */
slouken@2267:     if (Amask) {
slouken@2267:         SDL_SetSurfaceBlendMode(surface, SDL_TEXTUREBLENDMODE_BLEND);
slouken@2267:     }
slouken@2267: 
slouken@1895:     /* The surface is ready to go */
slouken@1895:     surface->refcount = 1;
slouken@0: #ifdef CHECK_LEAKS
slouken@1895:     ++surfaces_allocated;
slouken@0: #endif
slouken@1895:     return surface;
slouken@0: }
slouken@1895: 
slouken@0: /*
slouken@0:  * Create an RGB surface from an existing memory buffer
slouken@0:  */
slouken@1895: SDL_Surface *
slouken@1895: SDL_CreateRGBSurfaceFrom(void *pixels,
slouken@1895:                          int width, int height, int depth, int pitch,
slouken@1895:                          Uint32 Rmask, Uint32 Gmask, Uint32 Bmask,
slouken@1895:                          Uint32 Amask)
slouken@0: {
slouken@1895:     SDL_Surface *surface;
slouken@0: 
slouken@1895:     surface =
slouken@1895:         SDL_CreateRGBSurface(0, 0, 0, depth, Rmask, Gmask, Bmask, Amask);
slouken@1895:     if (surface != NULL) {
slouken@1895:         surface->flags |= SDL_PREALLOC;
slouken@1895:         surface->pixels = pixels;
slouken@1895:         surface->w = width;
slouken@1895:         surface->h = height;
slouken@1895:         surface->pitch = pitch;
slouken@1895:         SDL_SetClipRect(surface, NULL);
slouken@1895:     }
slouken@1895:     return surface;
slouken@0: }
slouken@1895: 
slouken@1895: static int
slouken@1895: SDL_SurfacePaletteChanged(void *userdata, SDL_Palette * palette)
slouken@1895: {
slouken@1895:     SDL_Surface *surface = (SDL_Surface *) userdata;
slouken@1895: 
slouken@1895:     SDL_FormatChanged(surface);
slouken@1895: 
slouken@1895:     return 0;
slouken@1895: }
slouken@1895: 
slouken@1895: int
slouken@1895: SDL_SetSurfacePalette(SDL_Surface * surface, SDL_Palette * palette)
slouken@1895: {
slouken@1895:     if (!surface || !surface->format) {
slouken@1895:         SDL_SetError("SDL_SetSurfacePalette() passed a NULL surface");
slouken@1895:         return -1;
slouken@1895:     }
slouken@1895: 
slouken@1895:     if (palette && palette->ncolors != (1 << surface->format->BitsPerPixel)) {
slouken@1895:         SDL_SetError
slouken@1895:             ("SDL_SetSurfacePalette() passed a palette that doesn't match the surface format");
slouken@1895:         return -1;
slouken@1895:     }
slouken@1895: 
slouken@1895:     if (surface->format->palette == palette) {
slouken@1895:         return 0;
slouken@1895:     }
slouken@1895: 
slouken@1895:     if (surface->format->palette) {
slouken@1895:         SDL_DelPaletteWatch(surface->format->palette,
slouken@1895:                             SDL_SurfacePaletteChanged, surface);
slouken@1895:     }
slouken@1895: 
slouken@1895:     surface->format->palette = palette;
slouken@1895: 
slouken@1895:     if (surface->format->palette) {
slouken@1895:         SDL_AddPaletteWatch(surface->format->palette,
slouken@1895:                             SDL_SurfacePaletteChanged, surface);
slouken@1895:     }
slouken@1895:     return 0;
slouken@1895: }
slouken@1895: 
slouken@2267: int
slouken@2267: SDL_SetSurfaceRLE(SDL_Surface * surface, int flag)
slouken@0: {
slouken@2267:     int flags;
slouken@0: 
slouken@2266:     if (!surface) {
slouken@2266:         return -1;
slouken@1895:     }
slouken@0: 
slouken@2267:     flags = surface->map->info.flags;
slouken@1895:     if (flag) {
slouken@2267:         surface->map->info.flags |= SDL_COPY_RLE_DESIRED;
slouken@1895:     } else {
slouken@2267:         surface->map->info.flags &= ~SDL_COPY_RLE_DESIRED;
slouken@1895:     }
slouken@2267:     if (surface->map->info.flags != flags) {
slouken@1895:         SDL_InvalidateMap(surface->map);
slouken@1895:     }
slouken@1895:     return 0;
slouken@431: }
slouken@0: 
slouken@2267: int
slouken@2267: SDL_SetColorKey(SDL_Surface * surface, Uint32 flag, Uint32 key)
slouken@2266: {
slouken@2266:     int flags;
slouken@2266: 
slouken@2266:     if (!surface) {
slouken@2266:         return -1;
slouken@2266:     }
slouken@2266: 
slouken@2266:     if (flag & SDL_RLEACCEL) {
slouken@2266:         SDL_SetSurfaceRLE(surface, 1);
slouken@2266:     }
slouken@2266: 
slouken@2266:     flags = surface->map->info.flags;
slouken@2266:     if (flag) {
slouken@2266:         surface->map->info.flags |= SDL_COPY_COLORKEY;
slouken@2266:         surface->map->info.colorkey = key;
slouken@2266:     } else {
slouken@2266:         surface->map->info.flags &= ~SDL_COPY_COLORKEY;
slouken@2266:     }
slouken@2266:     if (surface->map->info.flags != flags) {
slouken@2266:         SDL_InvalidateMap(surface->map);
slouken@2266:     }
slouken@2267: 
slouken@2267:     /* Compatibility mode */
slouken@2267:     if (surface->map->info.flags & SDL_COPY_COLORKEY) {
slouken@2267:         surface->flags |= SDL_SRCCOLORKEY;
slouken@2267:     } else {
slouken@2267:         surface->flags &= ~SDL_SRCCOLORKEY;
slouken@2267:     }
slouken@2267: 
slouken@2266:     return 0;
slouken@2266: }
slouken@2266: 
slouken@2785: /* This is a fairly slow function to switch from colorkey to alpha */
slouken@2787: static void
slouken@2786: SDL_ConvertColorkeyToAlpha(SDL_Surface * surface)
slouken@2785: {
slouken@2786:     int x, y;
slouken@2785: 
slouken@2786:     if (!surface) {
slouken@2786:         return;
slouken@2786:     }
slouken@2785: 
slouken@2786:     if (!(surface->map->info.flags & SDL_COPY_COLORKEY) ||
slouken@2786:         !surface->format->Amask) {
slouken@2786:         return;
slouken@2786:     }
slouken@2785: 
slouken@2786:     SDL_LockSurface(surface);
slouken@2785: 
slouken@2786:     switch (surface->format->BytesPerPixel) {
slouken@2786:     case 2:
slouken@2786:         {
slouken@2786:             Uint16 *row, *spot;
slouken@2786:             Uint16 ckey = (Uint16) surface->map->info.colorkey;
slouken@2786:             Uint16 mask = (Uint16) (~surface->format->Amask);
slouken@2785: 
slouken@2786:             row = (Uint16 *) surface->pixels;
slouken@2786:             for (y = surface->h; y--;) {
slouken@2786:                 spot = row;
slouken@2786:                 for (x = surface->w; x--;) {
slouken@2786:                     if (*spot == ckey) {
slouken@2786:                         *spot &= mask;
slouken@2786:                     }
slouken@2786:                     ++spot;
slouken@2786:                 }
slouken@2786:                 row += surface->pitch / 2;
slouken@2786:             }
slouken@2786:         }
slouken@2786:         break;
slouken@2786:     case 3:
slouken@2786:         /* FIXME */
slouken@2786:         break;
slouken@2786:     case 4:
slouken@2786:         {
slouken@2786:             Uint32 *row, *spot;
slouken@2786:             Uint32 ckey = surface->map->info.colorkey;
slouken@2786:             Uint32 mask = ~surface->format->Amask;
slouken@2785: 
slouken@2786:             row = (Uint32 *) surface->pixels;
slouken@2786:             for (y = surface->h; y--;) {
slouken@2786:                 spot = row;
slouken@2786:                 for (x = surface->w; x--;) {
slouken@2786:                     if (*spot == ckey) {
slouken@2786:                         *spot &= mask;
slouken@2786:                     }
slouken@2786:                     ++spot;
slouken@2786:                 }
slouken@2786:                 row += surface->pitch / 4;
slouken@2786:             }
slouken@2786:         }
slouken@2786:         break;
slouken@2786:     }
slouken@2785: 
slouken@2786:     SDL_UnlockSurface(surface);
slouken@2785: 
slouken@2786:     SDL_SetColorKey(surface, 0, 0);
slouken@2824:     SDL_SetSurfaceBlendMode(surface, SDL_TEXTUREBLENDMODE_BLEND);
slouken@2785: }
slouken@2785: 
slouken@2267: int
slouken@2267: SDL_SetSurfaceColorMod(SDL_Surface * surface, Uint8 r, Uint8 g, Uint8 b)
slouken@2266: {
slouken@2266:     int flags;
slouken@2266: 
slouken@2266:     if (!surface) {
slouken@2266:         return -1;
slouken@2266:     }
slouken@2266: 
slouken@2266:     surface->map->info.r = r;
slouken@2266:     surface->map->info.g = g;
slouken@2266:     surface->map->info.b = b;
slouken@2266: 
slouken@2266:     flags = surface->map->info.flags;
slouken@2266:     if (r != 0xFF || g != 0xFF || b != 0xFF) {
slouken@2266:         surface->map->info.flags |= SDL_COPY_MODULATE_COLOR;
slouken@2266:     } else {
slouken@2266:         surface->map->info.flags &= ~SDL_COPY_MODULATE_COLOR;
slouken@2266:     }
slouken@2266:     if (surface->map->info.flags != flags) {
slouken@2266:         SDL_InvalidateMap(surface->map);
slouken@2266:     }
slouken@2266:     return 0;
slouken@2266: }
slouken@2266: 
slouken@2266: 
slouken@2267: int
slouken@2267: SDL_GetSurfaceColorMod(SDL_Surface * surface, Uint8 * r, Uint8 * g, Uint8 * b)
slouken@2266: {
slouken@2266:     if (!surface) {
slouken@2266:         return -1;
slouken@2266:     }
slouken@2266: 
slouken@2266:     if (r) {
slouken@2266:         *r = surface->map->info.r;
slouken@2266:     }
slouken@2266:     if (g) {
slouken@2266:         *g = surface->map->info.g;
slouken@2266:     }
slouken@2266:     if (b) {
slouken@2266:         *b = surface->map->info.b;
slouken@2266:     }
slouken@2266:     return 0;
slouken@2266: }
slouken@2266: 
slouken@2267: int
slouken@2267: SDL_SetSurfaceAlphaMod(SDL_Surface * surface, Uint8 alpha)
slouken@2266: {
slouken@2266:     int flags;
slouken@2266: 
slouken@2266:     if (!surface) {
slouken@2266:         return -1;
slouken@2266:     }
slouken@2266: 
slouken@2266:     surface->map->info.a = alpha;
slouken@2266: 
slouken@2266:     flags = surface->map->info.flags;
slouken@2266:     if (alpha != 0xFF) {
slouken@2266:         surface->map->info.flags |= SDL_COPY_MODULATE_ALPHA;
slouken@2266:     } else {
slouken@2266:         surface->map->info.flags &= ~SDL_COPY_MODULATE_ALPHA;
slouken@2266:     }
slouken@2266:     if (surface->map->info.flags != flags) {
slouken@2266:         SDL_InvalidateMap(surface->map);
slouken@2266:     }
slouken@2266:     return 0;
slouken@2266: }
slouken@2266: 
slouken@2267: int
slouken@2267: SDL_GetSurfaceAlphaMod(SDL_Surface * surface, Uint8 * alpha)
slouken@2266: {
slouken@2266:     if (!surface) {
slouken@2266:         return -1;
slouken@2266:     }
slouken@2266: 
slouken@2266:     if (alpha) {
slouken@2266:         *alpha = surface->map->info.a;
slouken@2266:     }
slouken@2266:     return 0;
slouken@2266: }
slouken@2266: 
slouken@2267: int
slouken@2267: SDL_SetSurfaceBlendMode(SDL_Surface * surface, int blendMode)
slouken@2266: {
slouken@2266:     int flags, status;
slouken@2266: 
slouken@2266:     if (!surface) {
slouken@2266:         return -1;
slouken@2266:     }
slouken@2266: 
slouken@2266:     status = 0;
slouken@2266:     flags = surface->map->info.flags;
slouken@2267:     surface->map->info.flags &=
slouken@2267:         ~(SDL_COPY_MASK | SDL_COPY_BLEND | SDL_COPY_ADD | SDL_COPY_MOD);
slouken@2266:     switch (blendMode) {
slouken@2266:     case SDL_TEXTUREBLENDMODE_NONE:
slouken@2266:         break;
slouken@2266:     case SDL_TEXTUREBLENDMODE_MASK:
slouken@2266:         surface->map->info.flags |= SDL_COPY_MASK;
slouken@2266:         break;
slouken@2266:     case SDL_TEXTUREBLENDMODE_BLEND:
slouken@2266:         surface->map->info.flags |= SDL_COPY_BLEND;
slouken@2266:         break;
slouken@2266:     case SDL_TEXTUREBLENDMODE_ADD:
slouken@2266:         surface->map->info.flags |= SDL_COPY_ADD;
slouken@2266:         break;
slouken@2266:     case SDL_TEXTUREBLENDMODE_MOD:
slouken@2266:         surface->map->info.flags |= SDL_COPY_MOD;
slouken@2266:         break;
slouken@2266:     default:
slouken@2266:         SDL_Unsupported();
slouken@2266:         status = -1;
slouken@2266:         break;
slouken@2266:     }
slouken@2266: 
slouken@2266:     if (surface->map->info.flags != flags) {
slouken@2266:         SDL_InvalidateMap(surface->map);
slouken@2266:     }
slouken@2267: 
slouken@2267:     /* Compatibility mode */
slouken@2267:     if (surface->map->info.flags & SDL_COPY_BLEND) {
slouken@2267:         surface->flags |= SDL_SRCALPHA;
slouken@2267:     } else {
slouken@2267:         surface->flags &= ~SDL_SRCALPHA;
slouken@2267:     }
slouken@2267: 
slouken@2266:     return status;
slouken@2266: }
slouken@2266: 
slouken@2267: int
slouken@2267: SDL_GetSurfaceBlendMode(SDL_Surface * surface, int *blendMode)
slouken@2266: {
slouken@2266:     if (!surface) {
slouken@2266:         return -1;
slouken@2266:     }
slouken@2266: 
slouken@2266:     if (!blendMode) {
slouken@2266:         return 0;
slouken@2266:     }
slouken@2266: 
slouken@2735:     switch (surface->map->
slouken@2735:             info.flags & (SDL_COPY_MASK | SDL_COPY_BLEND | SDL_COPY_ADD |
slouken@2735:                           SDL_COPY_MOD)) {
slouken@2266:     case SDL_COPY_MASK:
slouken@2267:         *blendMode = SDL_TEXTUREBLENDMODE_MASK;
slouken@2266:         break;
slouken@2266:     case SDL_COPY_BLEND:
slouken@2267:         *blendMode = SDL_TEXTUREBLENDMODE_BLEND;
slouken@2266:         break;
slouken@2266:     case SDL_COPY_ADD:
slouken@2267:         *blendMode = SDL_TEXTUREBLENDMODE_ADD;
slouken@2266:         break;
slouken@2266:     case SDL_COPY_MOD:
slouken@2267:         *blendMode = SDL_TEXTUREBLENDMODE_MOD;
slouken@2266:         break;
slouken@2266:     default:
slouken@2267:         *blendMode = SDL_TEXTUREBLENDMODE_NONE;
slouken@2266:         break;
slouken@2266:     }
slouken@2266:     return 0;
slouken@2266: }
slouken@2266: 
slouken@2267: int
slouken@2267: SDL_SetSurfaceScaleMode(SDL_Surface * surface, int scaleMode)
slouken@2266: {
slouken@2266:     int flags, status;
slouken@2266: 
slouken@2266:     if (!surface) {
slouken@2266:         return -1;
slouken@2266:     }
slouken@2266: 
slouken@2266:     status = 0;
slouken@2266:     flags = surface->map->info.flags;
slouken@2266:     surface->map->info.flags &= ~(SDL_COPY_NEAREST);
slouken@2266:     switch (scaleMode) {
slouken@2266:     case SDL_TEXTURESCALEMODE_NONE:
slouken@2266:         break;
slouken@2266:     case SDL_TEXTURESCALEMODE_FAST:
slouken@2266:         surface->map->info.flags |= SDL_COPY_NEAREST;
slouken@2266:         break;
slouken@2266:     case SDL_TEXTURESCALEMODE_SLOW:
slouken@2266:     case SDL_TEXTURESCALEMODE_BEST:
slouken@2266:         SDL_Unsupported();
slouken@2266:         surface->map->info.flags |= SDL_COPY_NEAREST;
slouken@2266:         status = -1;
slouken@2266:         break;
slouken@2266:     default:
slouken@2266:         SDL_Unsupported();
slouken@2266:         status = -1;
slouken@2266:         break;
slouken@2266:     }
slouken@2266: 
slouken@2266:     if (surface->map->info.flags != flags) {
slouken@2266:         SDL_InvalidateMap(surface->map);
slouken@2266:     }
slouken@2266:     return status;
slouken@2266: }
slouken@2266: 
slouken@2267: int
slouken@2267: SDL_GetSurfaceScaleMode(SDL_Surface * surface, int *scaleMode)
slouken@2266: {
slouken@2266:     if (!surface) {
slouken@2266:         return -1;
slouken@2266:     }
slouken@2266: 
slouken@2266:     if (!scaleMode) {
slouken@2266:         return 0;
slouken@2266:     }
slouken@2266: 
slouken@2267:     switch (surface->map->info.flags & (SDL_COPY_NEAREST)) {
slouken@2267:     case SDL_COPY_NEAREST:
slouken@2267:         *scaleMode = SDL_TEXTURESCALEMODE_FAST;
slouken@2266:         break;
slouken@2266:     default:
slouken@2267:         *scaleMode = SDL_TEXTURESCALEMODE_NONE;
slouken@2266:         break;
slouken@2266:     }
slouken@2266:     return 0;
slouken@2266: }
slouken@2266: 
slouken@1895: SDL_bool
slouken@1895: SDL_SetClipRect(SDL_Surface * surface, const SDL_Rect * rect)
slouken@0: {
slouken@1895:     SDL_Rect full_rect;
slouken@0: 
slouken@1895:     /* Don't do anything if there's no surface to act on */
slouken@1895:     if (!surface) {
slouken@1895:         return SDL_FALSE;
slouken@1895:     }
slouken@0: 
slouken@1895:     /* Set up the full surface rectangle */
slouken@1895:     full_rect.x = 0;
slouken@1895:     full_rect.y = 0;
slouken@1895:     full_rect.w = surface->w;
slouken@1895:     full_rect.h = surface->h;
slouken@0: 
slouken@1895:     /* Set the clipping rectangle */
slouken@1895:     if (!rect) {
slouken@1895:         surface->clip_rect = full_rect;
slouken@1895:         return 1;
slouken@1895:     }
slouken@1895:     return SDL_IntersectRect(rect, &full_rect, &surface->clip_rect);
slouken@0: }
slouken@1895: 
slouken@1895: void
slouken@1895: SDL_GetClipRect(SDL_Surface * surface, SDL_Rect * rect)
slouken@0: {
slouken@1895:     if (surface && rect) {
slouken@1895:         *rect = surface->clip_rect;
slouken@1895:     }
slouken@0: }
slouken@1895: 
slouken@0: /* 
slouken@0:  * Set up a blit between two surfaces -- split into three parts:
slouken@0:  * The upper part, SDL_UpperBlit(), performs clipping and rectangle 
slouken@0:  * verification.  The lower part is a pointer to a low level
slouken@0:  * accelerated blitting function.
slouken@0:  *
slouken@0:  * These parts are separated out and each used internally by this 
slouken@0:  * library in the optimimum places.  They are exported so that if
slouken@0:  * you know exactly what you are doing, you can optimize your code
slouken@0:  * by calling the one(s) you need.
slouken@0:  */
slouken@1895: int
slouken@1895: SDL_LowerBlit(SDL_Surface * src, SDL_Rect * srcrect,
slouken@1895:               SDL_Surface * dst, SDL_Rect * dstrect)
slouken@0: {
slouken@1895:     /* Check to make sure the blit mapping is valid */
slouken@1895:     if ((src->map->dst != dst) ||
slouken@1895:         (src->map->dst->format_version != src->map->format_version)) {
slouken@1895:         if (SDL_MapSurface(src, dst) < 0) {
slouken@1895:             return (-1);
slouken@1895:         }
bob@2328:         /* just here for debugging */
bob@2329: /*         printf */
bob@2329: /*             ("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", */
bob@2329: /*              src, dst->flags, src->map->info.flags, dst, dst->flags, */
bob@2329: /*              dst->map->info.flags, src->map->blit); */
slouken@1895:     }
slouken@2257:     return (src->map->blit(src, srcrect, dst, dstrect));
slouken@0: }
slouken@0: 
slouken@0: 
slouken@1895: int
slouken@1895: SDL_UpperBlit(SDL_Surface * src, SDL_Rect * srcrect,
slouken@1895:               SDL_Surface * dst, SDL_Rect * dstrect)
slouken@0: {
slouken@1895:     SDL_Rect fulldst;
slouken@1895:     int srcx, srcy, w, h;
slouken@0: 
slouken@1895:     /* Make sure the surfaces aren't locked */
slouken@1895:     if (!src || !dst) {
slouken@1895:         SDL_SetError("SDL_UpperBlit: passed a NULL surface");
slouken@1895:         return (-1);
slouken@1895:     }
slouken@1895:     if (src->locked || dst->locked) {
slouken@1895:         SDL_SetError("Surfaces must not be locked during blit");
slouken@1895:         return (-1);
slouken@1895:     }
slouken@0: 
slouken@1895:     /* If the destination rectangle is NULL, use the entire dest surface */
slouken@1895:     if (dstrect == NULL) {
slouken@1895:         fulldst.x = fulldst.y = 0;
slouken@1895:         dstrect = &fulldst;
slouken@1895:     }
slouken@0: 
slouken@1895:     /* clip the source rectangle to the source surface */
slouken@1895:     if (srcrect) {
slouken@1895:         int maxw, maxh;
slouken@0: 
slouken@1895:         srcx = srcrect->x;
slouken@1895:         w = srcrect->w;
slouken@1895:         if (srcx < 0) {
slouken@1895:             w += srcx;
slouken@1895:             dstrect->x -= srcx;
slouken@1895:             srcx = 0;
slouken@1895:         }
slouken@1895:         maxw = src->w - srcx;
slouken@1895:         if (maxw < w)
slouken@1895:             w = maxw;
slouken@0: 
slouken@1895:         srcy = srcrect->y;
slouken@1895:         h = srcrect->h;
slouken@1895:         if (srcy < 0) {
slouken@1895:             h += srcy;
slouken@1895:             dstrect->y -= srcy;
slouken@1895:             srcy = 0;
slouken@1895:         }
slouken@1895:         maxh = src->h - srcy;
slouken@1895:         if (maxh < h)
slouken@1895:             h = maxh;
slouken@0: 
slouken@1895:     } else {
slouken@1895:         srcx = srcy = 0;
slouken@1895:         w = src->w;
slouken@1895:         h = src->h;
slouken@1895:     }
slouken@0: 
slouken@1895:     /* clip the destination rectangle against the clip rectangle */
slouken@1895:     {
slouken@1895:         SDL_Rect *clip = &dst->clip_rect;
slouken@1895:         int dx, dy;
slouken@0: 
slouken@1895:         dx = clip->x - dstrect->x;
slouken@1895:         if (dx > 0) {
slouken@1895:             w -= dx;
slouken@1895:             dstrect->x += dx;
slouken@1895:             srcx += dx;
slouken@1895:         }
slouken@1895:         dx = dstrect->x + w - clip->x - clip->w;
slouken@1895:         if (dx > 0)
slouken@1895:             w -= dx;
slouken@1895: 
slouken@1895:         dy = clip->y - dstrect->y;
slouken@1895:         if (dy > 0) {
slouken@1895:             h -= dy;
slouken@1895:             dstrect->y += dy;
slouken@1895:             srcy += dy;
slouken@1895:         }
slouken@1895:         dy = dstrect->y + h - clip->y - clip->h;
slouken@1895:         if (dy > 0)
slouken@1895:             h -= dy;
slouken@1895:     }
slouken@1895: 
slouken@1895:     if (w > 0 && h > 0) {
slouken@1895:         SDL_Rect sr;
slouken@1895:         sr.x = srcx;
slouken@1895:         sr.y = srcy;
slouken@1895:         sr.w = dstrect->w = w;
slouken@1895:         sr.h = dstrect->h = h;
slouken@1895:         return SDL_LowerBlit(src, &sr, dst, dstrect);
slouken@1895:     }
slouken@1895:     dstrect->w = dstrect->h = 0;
slouken@1895:     return 0;
slouken@0: }
slouken@0: 
slouken@0: /*
slouken@0:  * Lock a surface to directly access the pixels
slouken@0:  */
slouken@1895: int
slouken@1895: SDL_LockSurface(SDL_Surface * surface)
slouken@0: {
slouken@1895:     if (!surface->locked) {
slouken@1895:         /* Perform the lock */
slouken@1895:         if (surface->flags & SDL_RLEACCEL) {
slouken@1895:             SDL_UnRLESurface(surface, 1);
slouken@1895:             surface->flags |= SDL_RLEACCEL;     /* save accel'd state */
slouken@1895:         }
slouken@1895:     }
slouken@0: 
slouken@1895:     /* Increment the surface lock count, for recursive locks */
slouken@1895:     ++surface->locked;
slouken@0: 
slouken@1895:     /* Ready to go.. */
slouken@1895:     return (0);
slouken@0: }
slouken@1895: 
slouken@0: /*
slouken@0:  * Unlock a previously locked surface
slouken@0:  */
slouken@1895: void
slouken@1895: SDL_UnlockSurface(SDL_Surface * surface)
slouken@0: {
slouken@1895:     /* Only perform an unlock if we are locked */
slouken@1895:     if (!surface->locked || (--surface->locked > 0)) {
slouken@1895:         return;
slouken@1895:     }
slouken@0: 
slouken@1895:     /* Update RLE encoded surface with new data */
slouken@1895:     if ((surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL) {
slouken@1895:         surface->flags &= ~SDL_RLEACCEL;        /* stop lying */
slouken@1895:         SDL_RLESurface(surface);
slouken@1895:     }
slouken@0: }
slouken@0: 
slouken@0: /* 
slouken@0:  * Convert a surface into the specified pixel format.
slouken@0:  */
slouken@1895: SDL_Surface *
slouken@2807: SDL_ConvertSurface(SDL_Surface * surface, SDL_PixelFormat * format,
slouken@2807:                    Uint32 flags)
slouken@0: {
slouken@1895:     SDL_Surface *convert;
slouken@2266:     Uint32 copy_flags;
slouken@1895:     SDL_Rect bounds;
slouken@0: 
slouken@1895:     /* Check for empty destination palette! (results in empty image) */
slouken@1895:     if (format->palette != NULL) {
slouken@1895:         int i;
slouken@1895:         for (i = 0; i < format->palette->ncolors; ++i) {
slouken@1895:             if ((format->palette->colors[i].r != 0xFF) ||
slouken@1895:                 (format->palette->colors[i].g != 0xFF) ||
slouken@1895:                 (format->palette->colors[i].b != 0xFF))
slouken@1895:                 break;
slouken@1895:         }
slouken@1895:         if (i == format->palette->ncolors) {
slouken@1895:             SDL_SetError("Empty destination palette");
slouken@1895:             return (NULL);
slouken@1895:         }
slouken@1895:     }
slouken@0: 
slouken@1895:     /* Create a new surface with the desired format */
slouken@2807:     convert = SDL_CreateRGBSurface(flags, surface->w, surface->h,
slouken@1895:                                    format->BitsPerPixel, format->Rmask,
slouken@1895:                                    format->Gmask, format->Bmask,
slouken@1895:                                    format->Amask);
slouken@1895:     if (convert == NULL) {
slouken@1895:         return (NULL);
slouken@1895:     }
slouken@264: 
slouken@1895:     /* Copy the palette if any */
slouken@1895:     if (format->palette && convert->format->palette) {
slouken@1895:         SDL_memcpy(convert->format->palette->colors,
slouken@1895:                    format->palette->colors,
slouken@1895:                    format->palette->ncolors * sizeof(SDL_Color));
slouken@1895:         convert->format->palette->ncolors = format->palette->ncolors;
slouken@1895:     }
slouken@0: 
slouken@2266:     /* Save the original copy flags */
slouken@2266:     copy_flags = surface->map->info.flags;
slouken@2266:     surface->map->info.flags = 0;
slouken@0: 
slouken@1895:     /* Copy over the image data */
slouken@1895:     bounds.x = 0;
slouken@1895:     bounds.y = 0;
slouken@1895:     bounds.w = surface->w;
slouken@1895:     bounds.h = surface->h;
slouken@1895:     SDL_LowerBlit(surface, &bounds, convert, &bounds);
slouken@0: 
slouken@1895:     /* Clean up the original surface, and update converted surface */
slouken@2824:     convert->map->info.r = surface->map->info.r;
slouken@2824:     convert->map->info.g = surface->map->info.g;
slouken@2824:     convert->map->info.b = surface->map->info.b;
slouken@2824:     convert->map->info.a = surface->map->info.a;
slouken@2824:     convert->map->info.flags =
slouken@2824:         (copy_flags &
slouken@2824:          ~(SDL_COPY_COLORKEY | SDL_COPY_BLEND
slouken@2824:            | SDL_COPY_RLE_DESIRED | SDL_COPY_RLE_COLORKEY |
slouken@2824:            SDL_COPY_RLE_ALPHAKEY));
slouken@2824:     surface->map->info.flags = copy_flags;
slouken@2266:     if (copy_flags & SDL_COPY_COLORKEY) {
slouken@2266:         Uint8 keyR, keyG, keyB, keyA;
slouken@2266: 
slouken@2267:         SDL_GetRGBA(surface->map->info.colorkey, surface->format, &keyR,
slouken@2267:                     &keyG, &keyB, &keyA);
slouken@2266:         SDL_SetColorKey(convert, 1,
slouken@2266:                         SDL_MapRGBA(convert->format, keyR, keyG, keyB, keyA));
slouken@2824:         /* This is needed when converting for 3D texture upload */
slouken@2787:         SDL_ConvertColorkeyToAlpha(convert);
slouken@1895:     }
slouken@2824:     SDL_SetClipRect(convert, &surface->clip_rect);
slouken@0: 
slouken@2266:     /* Enable alpha blending by default if the new surface has an
slouken@2266:      * alpha channel or alpha modulation */
slouken@2824:     if ((surface->format->Amask && format->Amask) ||
slouken@2824:         (copy_flags & SDL_COPY_MODULATE_ALPHA)) {
slouken@2266:         SDL_SetSurfaceBlendMode(convert, SDL_TEXTUREBLENDMODE_BLEND);
slouken@1895:     }
slouken@2824:     if ((copy_flags & SDL_COPY_RLE_DESIRED) || (flags & SDL_RLEACCEL)) {
slouken@2824:         SDL_SetSurfaceRLE(convert, SDL_RLEACCEL);
slouken@2824:     }
slouken@0: 
slouken@1895:     /* We're ready to go! */
slouken@1895:     return (convert);
slouken@0: }
slouken@0: 
slouken@0: /*
slouken@0:  * Free a surface created by the above function.
slouken@0:  */
slouken@1895: void
slouken@1895: SDL_FreeSurface(SDL_Surface * surface)
slouken@0: {
slouken@1895:     if (surface == NULL) {
slouken@1895:         return;
slouken@1895:     }
slouken@1895:     if (--surface->refcount > 0) {
slouken@1895:         return;
slouken@1895:     }
slouken@1895:     while (surface->locked > 0) {
slouken@1895:         SDL_UnlockSurface(surface);
slouken@1895:     }
slouken@1895:     if (surface->flags & SDL_RLEACCEL) {
slouken@1895:         SDL_UnRLESurface(surface, 0);
slouken@1895:     }
slouken@1895:     if (surface->format) {
slouken@1895:         SDL_SetSurfacePalette(surface, NULL);
slouken@1895:         SDL_FreeFormat(surface->format);
slouken@1895:         surface->format = NULL;
slouken@1895:     }
slouken@1895:     if (surface->map != NULL) {
slouken@1895:         SDL_FreeBlitMap(surface->map);
slouken@1895:         surface->map = NULL;
slouken@1895:     }
slouken@1895:     if (surface->pixels && ((surface->flags & SDL_PREALLOC) != SDL_PREALLOC)) {
slouken@1895:         SDL_free(surface->pixels);
slouken@1895:     }
slouken@1895:     SDL_free(surface);
slouken@0: #ifdef CHECK_LEAKS
slouken@1895:     --surfaces_allocated;
slouken@0: #endif
slouken@0: }
slouken@1895: 
slouken@1895: /* vi: set ts=4 sw=4 expandtab: */