946 lines
25 KiB
C
946 lines
25 KiB
C
/*
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SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2010 Sam Lantinga
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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Sam Lantinga
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slouken@libsdl.org
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*/
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#include "SDL_config.h"
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#include "SDL_video.h"
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#include "SDL_compat.h"
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#include "SDL_sysvideo.h"
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#include "SDL_blit.h"
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#include "SDL_RLEaccel_c.h"
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#include "SDL_pixels_c.h"
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#include "SDL_leaks.h"
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/* Public routines */
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/*
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* Create an empty RGB surface of the appropriate depth
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*/
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SDL_Surface *
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SDL_CreateRGBSurface(Uint32 flags,
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int width, int height, int depth,
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Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask)
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{
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SDL_Surface *surface;
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/* The flags are no longer used, make the compiler happy */
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(void)flags;
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/* Allocate the surface */
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surface = (SDL_Surface *) SDL_calloc(1, sizeof(*surface));
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if (surface == NULL) {
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SDL_OutOfMemory();
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return NULL;
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}
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surface->format = SDL_AllocFormat(depth, Rmask, Gmask, Bmask, Amask);
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if (!surface->format) {
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SDL_FreeSurface(surface);
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return NULL;
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}
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surface->w = width;
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surface->h = height;
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surface->pitch = SDL_CalculatePitch(surface);
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SDL_SetClipRect(surface, NULL);
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if (surface->format->BitsPerPixel <= 8) {
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SDL_Palette *palette =
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SDL_AllocPalette((1 << surface->format->BitsPerPixel));
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if (!palette) {
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SDL_FreeSurface(surface);
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return NULL;
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}
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if (Rmask || Bmask || Gmask) {
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const SDL_PixelFormat *format = surface->format;
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/* create palette according to masks */
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int i;
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int Rm = 0, Gm = 0, Bm = 0;
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int Rw = 0, Gw = 0, Bw = 0;
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if (Rmask) {
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Rw = 8 - format->Rloss;
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for (i = format->Rloss; i > 0; i -= Rw)
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Rm |= 1 << i;
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}
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if (Gmask) {
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Gw = 8 - format->Gloss;
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for (i = format->Gloss; i > 0; i -= Gw)
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Gm |= 1 << i;
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}
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if (Bmask) {
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Bw = 8 - format->Bloss;
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for (i = format->Bloss; i > 0; i -= Bw)
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Bm |= 1 << i;
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}
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for (i = 0; i < palette->ncolors; ++i) {
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int r, g, b;
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r = (i & Rmask) >> format->Rshift;
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r = (r << format->Rloss) | ((r * Rm) >> Rw);
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palette->colors[i].r = r;
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g = (i & Gmask) >> format->Gshift;
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g = (g << format->Gloss) | ((g * Gm) >> Gw);
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palette->colors[i].g = g;
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b = (i & Bmask) >> format->Bshift;
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b = (b << format->Bloss) | ((b * Bm) >> Bw);
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palette->colors[i].b = b;
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}
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} else if (palette->ncolors == 2) {
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/* Create a black and white bitmap palette */
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palette->colors[0].r = 0xFF;
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palette->colors[0].g = 0xFF;
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palette->colors[0].b = 0xFF;
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palette->colors[1].r = 0x00;
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palette->colors[1].g = 0x00;
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palette->colors[1].b = 0x00;
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}
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SDL_SetSurfacePalette(surface, palette);
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SDL_FreePalette(palette);
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}
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/* Get the pixels */
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if (surface->w && surface->h) {
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surface->pixels = SDL_malloc(surface->h * surface->pitch);
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if (!surface->pixels) {
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SDL_FreeSurface(surface);
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SDL_OutOfMemory();
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return NULL;
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}
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/* This is important for bitmaps */
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SDL_memset(surface->pixels, 0, surface->h * surface->pitch);
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}
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/* Allocate an empty mapping */
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surface->map = SDL_AllocBlitMap();
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if (!surface->map) {
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SDL_FreeSurface(surface);
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return NULL;
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}
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SDL_FormatChanged(surface);
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/* By default surface with an alpha mask are set up for blending */
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if (Amask) {
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SDL_SetSurfaceBlendMode(surface, SDL_BLENDMODE_BLEND);
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}
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/* The surface is ready to go */
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surface->refcount = 1;
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#ifdef CHECK_LEAKS
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++surfaces_allocated;
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#endif
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return surface;
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}
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/*
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* Create an RGB surface from an existing memory buffer
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*/
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SDL_Surface *
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SDL_CreateRGBSurfaceFrom(void *pixels,
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int width, int height, int depth, int pitch,
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Uint32 Rmask, Uint32 Gmask, Uint32 Bmask,
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Uint32 Amask)
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{
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SDL_Surface *surface;
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surface =
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SDL_CreateRGBSurface(0, 0, 0, depth, Rmask, Gmask, Bmask, Amask);
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if (surface != NULL) {
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surface->flags |= SDL_PREALLOC;
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surface->pixels = pixels;
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surface->w = width;
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surface->h = height;
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surface->pitch = pitch;
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SDL_SetClipRect(surface, NULL);
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}
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return surface;
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}
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static int
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SDL_SurfacePaletteChanged(void *userdata, SDL_Palette * palette)
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{
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SDL_Surface *surface = (SDL_Surface *) userdata;
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SDL_FormatChanged(surface);
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return 0;
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}
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int
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SDL_SetSurfacePalette(SDL_Surface * surface, SDL_Palette * palette)
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{
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if (!surface || !surface->format) {
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SDL_SetError("SDL_SetSurfacePalette() passed a NULL surface");
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return -1;
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}
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if (palette && palette->ncolors != (1 << surface->format->BitsPerPixel)) {
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SDL_SetError
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("SDL_SetSurfacePalette() passed a palette that doesn't match the surface format");
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return -1;
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}
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if (surface->format->palette == palette) {
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return 0;
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}
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if (surface->format->palette) {
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SDL_DelPaletteWatch(surface->format->palette,
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SDL_SurfacePaletteChanged, surface);
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}
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surface->format->palette = palette;
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if (surface->format->palette) {
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SDL_AddPaletteWatch(surface->format->palette,
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SDL_SurfacePaletteChanged, surface);
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}
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return 0;
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}
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int
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SDL_SetSurfaceRLE(SDL_Surface * surface, int flag)
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{
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int flags;
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if (!surface) {
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return -1;
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}
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flags = surface->map->info.flags;
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if (flag) {
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surface->map->info.flags |= SDL_COPY_RLE_DESIRED;
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} else {
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surface->map->info.flags &= ~SDL_COPY_RLE_DESIRED;
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}
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if (surface->map->info.flags != flags) {
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SDL_InvalidateMap(surface->map);
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}
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return 0;
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}
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int
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SDL_SetColorKey(SDL_Surface * surface, int flag, Uint32 key)
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{
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int flags;
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if (!surface) {
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return -1;
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}
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if (flag & SDL_RLEACCEL) {
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SDL_SetSurfaceRLE(surface, 1);
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}
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flags = surface->map->info.flags;
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if (flag) {
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surface->map->info.flags |= SDL_COPY_COLORKEY;
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surface->map->info.colorkey = key;
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} else {
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surface->map->info.flags &= ~SDL_COPY_COLORKEY;
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}
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if (surface->map->info.flags != flags) {
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SDL_InvalidateMap(surface->map);
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}
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/* Compatibility mode */
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if (surface->map->info.flags & SDL_COPY_COLORKEY) {
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surface->flags |= SDL_SRCCOLORKEY;
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} else {
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surface->flags &= ~SDL_SRCCOLORKEY;
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}
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return 0;
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}
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int
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SDL_GetColorKey(SDL_Surface * surface, Uint32 * key)
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{
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if (!surface) {
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return -1;
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}
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if (!(surface->map->info.flags & SDL_COPY_COLORKEY)) {
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return -1;
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}
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if (key) {
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*key = surface->map->info.colorkey;
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}
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return 0;
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}
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/* This is a fairly slow function to switch from colorkey to alpha */
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static void
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SDL_ConvertColorkeyToAlpha(SDL_Surface * surface)
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{
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int x, y;
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if (!surface) {
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return;
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}
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if (!(surface->map->info.flags & SDL_COPY_COLORKEY) ||
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!surface->format->Amask) {
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return;
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}
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SDL_LockSurface(surface);
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switch (surface->format->BytesPerPixel) {
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case 2:
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{
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Uint16 *row, *spot;
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Uint16 ckey = (Uint16) surface->map->info.colorkey;
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Uint16 mask = (Uint16) (~surface->format->Amask);
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row = (Uint16 *) surface->pixels;
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for (y = surface->h; y--;) {
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spot = row;
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for (x = surface->w; x--;) {
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if (*spot == ckey) {
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*spot &= mask;
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}
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++spot;
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}
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row += surface->pitch / 2;
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}
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}
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break;
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case 3:
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/* FIXME */
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break;
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case 4:
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{
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Uint32 *row, *spot;
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Uint32 ckey = surface->map->info.colorkey;
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Uint32 mask = ~surface->format->Amask;
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row = (Uint32 *) surface->pixels;
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for (y = surface->h; y--;) {
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spot = row;
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for (x = surface->w; x--;) {
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if (*spot == ckey) {
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*spot &= mask;
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}
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++spot;
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}
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row += surface->pitch / 4;
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}
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}
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break;
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}
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SDL_UnlockSurface(surface);
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SDL_SetColorKey(surface, 0, 0);
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SDL_SetSurfaceBlendMode(surface, SDL_BLENDMODE_BLEND);
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}
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int
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SDL_SetSurfaceColorMod(SDL_Surface * surface, Uint8 r, Uint8 g, Uint8 b)
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{
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int flags;
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if (!surface) {
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return -1;
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}
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surface->map->info.r = r;
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surface->map->info.g = g;
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surface->map->info.b = b;
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flags = surface->map->info.flags;
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if (r != 0xFF || g != 0xFF || b != 0xFF) {
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surface->map->info.flags |= SDL_COPY_MODULATE_COLOR;
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} else {
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surface->map->info.flags &= ~SDL_COPY_MODULATE_COLOR;
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}
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if (surface->map->info.flags != flags) {
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SDL_InvalidateMap(surface->map);
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}
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return 0;
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}
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int
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SDL_GetSurfaceColorMod(SDL_Surface * surface, Uint8 * r, Uint8 * g, Uint8 * b)
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{
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if (!surface) {
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return -1;
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}
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if (r) {
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*r = surface->map->info.r;
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}
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if (g) {
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*g = surface->map->info.g;
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}
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if (b) {
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*b = surface->map->info.b;
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}
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return 0;
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}
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int
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SDL_SetSurfaceAlphaMod(SDL_Surface * surface, Uint8 alpha)
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{
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int flags;
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if (!surface) {
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return -1;
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}
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surface->map->info.a = alpha;
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flags = surface->map->info.flags;
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if (alpha != 0xFF) {
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surface->map->info.flags |= SDL_COPY_MODULATE_ALPHA;
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} else {
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surface->map->info.flags &= ~SDL_COPY_MODULATE_ALPHA;
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}
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if (surface->map->info.flags != flags) {
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SDL_InvalidateMap(surface->map);
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}
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return 0;
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}
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int
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SDL_GetSurfaceAlphaMod(SDL_Surface * surface, Uint8 * alpha)
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{
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if (!surface) {
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return -1;
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}
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if (alpha) {
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*alpha = surface->map->info.a;
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}
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return 0;
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}
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int
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SDL_SetSurfaceBlendMode(SDL_Surface * surface, SDL_BlendMode blendMode)
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{
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int flags, status;
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if (!surface) {
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return -1;
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}
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status = 0;
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flags = surface->map->info.flags;
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surface->map->info.flags &=
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~(SDL_COPY_MASK | SDL_COPY_BLEND | SDL_COPY_ADD | SDL_COPY_MOD);
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switch (blendMode) {
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case SDL_BLENDMODE_NONE:
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break;
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case SDL_BLENDMODE_MASK:
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surface->map->info.flags |= SDL_COPY_MASK;
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break;
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case SDL_BLENDMODE_BLEND:
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surface->map->info.flags |= SDL_COPY_BLEND;
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break;
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case SDL_BLENDMODE_ADD:
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surface->map->info.flags |= SDL_COPY_ADD;
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break;
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case SDL_BLENDMODE_MOD:
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surface->map->info.flags |= SDL_COPY_MOD;
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break;
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default:
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SDL_Unsupported();
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status = -1;
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break;
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}
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if (surface->map->info.flags != flags) {
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SDL_InvalidateMap(surface->map);
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}
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/* Compatibility mode */
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if (surface->map->info.flags & SDL_COPY_BLEND) {
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surface->flags |= SDL_SRCALPHA;
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} else {
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surface->flags &= ~SDL_SRCALPHA;
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}
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return status;
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}
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int
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SDL_GetSurfaceBlendMode(SDL_Surface * surface, SDL_BlendMode *blendMode)
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{
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if (!surface) {
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return -1;
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}
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if (!blendMode) {
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return 0;
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}
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|
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switch (surface->map->
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info.flags & (SDL_COPY_MASK | SDL_COPY_BLEND | SDL_COPY_ADD |
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SDL_COPY_MOD)) {
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case SDL_COPY_MASK:
|
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*blendMode = SDL_BLENDMODE_MASK;
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break;
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case SDL_COPY_BLEND:
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*blendMode = SDL_BLENDMODE_BLEND;
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break;
|
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case SDL_COPY_ADD:
|
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*blendMode = SDL_BLENDMODE_ADD;
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break;
|
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case SDL_COPY_MOD:
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*blendMode = SDL_BLENDMODE_MOD;
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break;
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default:
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*blendMode = SDL_BLENDMODE_NONE;
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break;
|
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}
|
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return 0;
|
|
}
|
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|
|
SDL_bool
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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;
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|
|
/* Set the clipping rectangle */
|
|
if (!rect) {
|
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surface->clip_rect = full_rect;
|
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return SDL_TRUE;
|
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}
|
|
return SDL_IntersectRect(rect, &full_rect, &surface->clip_rect);
|
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}
|
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|
|
void
|
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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) ||
|
|
(src->map->dst->format_version != src->map->format_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) {
|
|
SDL_SetError("SDL_UpperBlit: passed a NULL surface");
|
|
return (-1);
|
|
}
|
|
if (src->locked || dst->locked) {
|
|
SDL_SetError("Surfaces must not be locked during blit");
|
|
return (-1);
|
|
}
|
|
|
|
/* If the destination rectangle is NULL, use the entire dest surface */
|
|
if (dstrect == NULL) {
|
|
fulldst.x = fulldst.y = 0;
|
|
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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* 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, SDL_PixelFormat * format,
|
|
Uint32 flags)
|
|
{
|
|
SDL_Surface *convert;
|
|
Uint32 copy_flags;
|
|
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;
|
|
surface->map->info.flags = 0;
|
|
|
|
/* 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 = surface->map->info.r;
|
|
convert->map->info.g = surface->map->info.g;
|
|
convert->map->info.b = surface->map->info.b;
|
|
convert->map->info.a = surface->map->info.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.flags = copy_flags;
|
|
if (copy_flags & SDL_COPY_COLORKEY) {
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* Create a surface on the stack for quick blit operations
|
|
*/
|
|
static __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)
|
|
{
|
|
int bpp;
|
|
Uint32 Rmask, Gmask, Bmask, Amask;
|
|
|
|
if (!SDL_PixelFormatEnumToMasks(pixel_format,
|
|
&bpp, &Rmask, &Gmask, &Bmask, &Amask)) {
|
|
return SDL_FALSE;
|
|
}
|
|
if (bpp <= 8) {
|
|
SDL_SetError("Indexed pixel formats not supported");
|
|
return SDL_FALSE;
|
|
}
|
|
|
|
SDL_zerop(surface);
|
|
surface->flags = SDL_PREALLOC;
|
|
surface->format = SDL_InitFormat(format, bpp, Rmask, Gmask, Bmask, Amask);
|
|
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;
|
|
SDL_FormatChanged(surface);
|
|
|
|
/* 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;
|
|
|
|
/* Fast path for same format copy */
|
|
if (src_format == dst_format) {
|
|
int bpp;
|
|
|
|
if (SDL_ISPIXELFORMAT_FOURCC(src_format)) {
|
|
switch (src_format) {
|
|
case SDL_PIXELFORMAT_YV12:
|
|
case SDL_PIXELFORMAT_IYUV:
|
|
case SDL_PIXELFORMAT_YUY2:
|
|
case SDL_PIXELFORMAT_UYVY:
|
|
case SDL_PIXELFORMAT_YVYU:
|
|
bpp = 2;
|
|
default:
|
|
SDL_SetError("Unknown FOURCC pixel format");
|
|
return -1;
|
|
}
|
|
} else {
|
|
bpp = SDL_BYTESPERPIXEL(src_format);
|
|
}
|
|
width *= bpp;
|
|
|
|
while (height-- > 0) {
|
|
SDL_memcpy(dst, src, width);
|
|
src = (Uint8*)src + src_pitch;
|
|
dst = (Uint8*)dst + dst_pitch;
|
|
}
|
|
return SDL_TRUE;
|
|
}
|
|
|
|
if (!SDL_CreateSurfaceOnStack(width, height, src_format, (void*)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->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->pixels && ((surface->flags & SDL_PREALLOC) != SDL_PREALLOC)) {
|
|
SDL_free(surface->pixels);
|
|
}
|
|
SDL_free(surface);
|
|
#ifdef CHECK_LEAKS
|
|
--surfaces_allocated;
|
|
#endif
|
|
}
|
|
|
|
/* vi: set ts=4 sw=4 expandtab: */
|