This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
SDL_surface.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,
but WITHOUT ANY WARRANTY; without even the implied warranty of
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
License along with this library; if not, write to the Free Software
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"
#include "SDL_blit.h"
#include "SDL_RLEaccel_c.h"
#include "SDL_pixels_c.h"
#include "SDL_leaks.h"
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/* Public routines */
/*
* Create an empty RGB surface of the appropriate depth
*/
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SDL_Surface *
SDL_CreateRGBSurface(Uint32 flags,
int width, int height, int depth,
Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask)
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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) {
SDL_OutOfMemory();
return NULL;
}
surface->format = SDL_AllocFormat(depth, Rmask, Gmask, Bmask, Amask);
if (!surface->format) {
SDL_FreeSurface(surface);
return NULL;
}
surface->w = width;
surface->h = height;
surface->pitch = SDL_CalculatePitch(surface);
SDL_SetClipRect(surface, NULL);
if (surface->format->BitsPerPixel <= 8) {
SDL_Palette *palette =
SDL_AllocPalette((1 << surface->format->BitsPerPixel));
if (!palette) {
SDL_FreeSurface(surface);
return NULL;
}
if (Rmask || Bmask || Gmask) {
const SDL_PixelFormat *format = surface->format;
/* create palette according to masks */
int i;
int Rm = 0, Gm = 0, Bm = 0;
int Rw = 0, Gw = 0, Bw = 0;
if (Rmask) {
Rw = 8 - format->Rloss;
for (i = format->Rloss; i > 0; i -= Rw)
Rm |= 1 << i;
}
if (Gmask) {
Gw = 8 - format->Gloss;
for (i = format->Gloss; i > 0; i -= Gw)
Gm |= 1 << i;
}
if (Bmask) {
Bw = 8 - format->Bloss;
for (i = format->Bloss; i > 0; i -= Bw)
Bm |= 1 << i;
}
for (i = 0; i < palette->ncolors; ++i) {
int r, g, b;
r = (i & Rmask) >> format->Rshift;
r = (r << format->Rloss) | ((r * Rm) >> Rw);
palette->colors[i].r = r;
g = (i & Gmask) >> format->Gshift;
g = (g << format->Gloss) | ((g * Gm) >> Gw);
palette->colors[i].g = g;
b = (i & Bmask) >> format->Bshift;
b = (b << format->Bloss) | ((b * Bm) >> Bw);
palette->colors[i].b = b;
}
} else 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;
}
SDL_FormatChanged(surface);
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/* By default surface with an alpha mask are set up for blending */
if (Amask) {
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SDL_SetSurfaceBlendMode(surface, SDL_BLENDMODE_BLEND);
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/* The surface is ready to go */
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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/*
* Create an RGB surface from an existing memory buffer
*/
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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;
}
static int
SDL_SurfacePaletteChanged(void *userdata, SDL_Palette * palette)
{
SDL_Surface *surface = (SDL_Surface *) userdata;
SDL_FormatChanged(surface);
return 0;
}
int
SDL_SetSurfacePalette(SDL_Surface * surface, SDL_Palette * palette)
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{
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if (!surface || !surface->format) {
SDL_SetError("SDL_SetSurfacePalette() passed a NULL surface");
return -1;
}
if (palette && palette->ncolors != (1 << surface->format->BitsPerPixel)) {
SDL_SetError
("SDL_SetSurfacePalette() passed a palette that doesn't match the surface format");
return -1;
}
if (surface->format->palette == palette) {
return 0;
}
if (surface->format->palette) {
SDL_DelPaletteWatch(surface->format->palette,
SDL_SurfacePaletteChanged, surface);
}
surface->format->palette = palette;
if (surface->format->palette) {
SDL_AddPaletteWatch(surface->format->palette,
SDL_SurfacePaletteChanged, surface);
}
return 0;
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}
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int
SDL_SetSurfaceRLE(SDL_Surface * surface, int flag)
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{
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int flags;
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if (!surface) {
return -1;
}
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flags = surface->map->info.flags;
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surface->map->info.flags |= SDL_COPY_RLE_DESIRED;
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surface->map->info.flags &= ~SDL_COPY_RLE_DESIRED;
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if (surface->map->info.flags != flags) {
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SDL_InvalidateMap(surface->map);
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SDL_SetColorKey(SDL_Surface * surface, int flag, Uint32 key)
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{
int flags;
if (!surface) {
return -1;
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if (flag & SDL_RLEACCEL) {
SDL_SetSurfaceRLE(surface, 1);
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flags = surface->map->info.flags;
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surface->map->info.flags |= SDL_COPY_COLORKEY;
surface->map->info.colorkey = key;
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surface->map->info.flags &= ~SDL_COPY_COLORKEY;
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if (surface->map->info.flags != flags) {
SDL_InvalidateMap(surface->map);
}
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/* Compatibility mode */
if (surface->map->info.flags & SDL_COPY_COLORKEY) {
surface->flags |= SDL_SRCCOLORKEY;
} else {
surface->flags &= ~SDL_SRCCOLORKEY;
}
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}
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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;
}
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/* This is a fairly slow function to switch from colorkey to alpha */
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SDL_ConvertColorkeyToAlpha(SDL_Surface * surface)
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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);
row = (Uint16 *) surface->pixels;
for (y = surface->h; y--;) {
spot = row;
for (x = surface->w; x--;) {
if (*spot == ckey) {
*spot &= mask;
}
++spot;
}
row += surface->pitch / 2;
}
}
break;
case 3:
/* FIXME */
break;
case 4:
{
Uint32 *row, *spot;
Uint32 ckey = surface->map->info.colorkey;
Uint32 mask = ~surface->format->Amask;
row = (Uint32 *) surface->pixels;
for (y = surface->h; y--;) {
spot = row;
for (x = surface->w; x--;) {
if (*spot == ckey) {
*spot &= mask;
}
++spot;
}
row += surface->pitch / 4;
}
}
break;
}
SDL_UnlockSurface(surface);
SDL_SetColorKey(surface, 0, 0);
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SDL_SetSurfaceBlendMode(surface, SDL_BLENDMODE_BLEND);
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int
SDL_SetSurfaceColorMod(SDL_Surface * surface, Uint8 r, Uint8 g, Uint8 b)
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{
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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;
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surface->map->info.flags &= ~SDL_COPY_MODULATE_COLOR;
}
if (surface->map->info.flags != flags) {
SDL_InvalidateMap(surface->map);
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return 0;
}
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int
SDL_GetSurfaceColorMod(SDL_Surface * surface, Uint8 * r, Uint8 * g, Uint8 * b)
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{
if (!surface) {
return -1;
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if (r) {
*r = surface->map->info.r;
}
if (g) {
*g = surface->map->info.g;
}
if (b) {
*b = surface->map->info.b;
}
return 0;
}
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int
SDL_SetSurfaceAlphaMod(SDL_Surface * surface, Uint8 alpha)
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{
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;
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surface->map->info.flags &= ~SDL_COPY_MODULATE_ALPHA;
}
if (surface->map->info.flags != flags) {
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SDL_InvalidateMap(surface->map);
}
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}
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int
SDL_GetSurfaceAlphaMod(SDL_Surface * surface, Uint8 * alpha)
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if (!surface) {
return -1;
}
if (alpha) {
*alpha = surface->map->info.a;
}
return 0;
}
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int
SDL_SetSurfaceBlendMode(SDL_Surface * surface, int blendMode)
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{
int flags, status;
if (!surface) {
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return -1;
}
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status = 0;
flags = surface->map->info.flags;
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surface->map->info.flags &=
~(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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case SDL_BLENDMODE_MASK:
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surface->map->info.flags |= SDL_COPY_MASK;
break;
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case SDL_BLENDMODE_BLEND:
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surface->map->info.flags |= SDL_COPY_BLEND;
break;
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case SDL_BLENDMODE_ADD:
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surface->map->info.flags |= SDL_COPY_ADD;
break;
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case SDL_BLENDMODE_MOD:
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surface->map->info.flags |= SDL_COPY_MOD;
break;
default:
SDL_Unsupported();
status = -1;
break;
}
if (surface->map->info.flags != flags) {
SDL_InvalidateMap(surface->map);
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/* Compatibility mode */
if (surface->map->info.flags & SDL_COPY_BLEND) {
surface->flags |= SDL_SRCALPHA;
} else {
surface->flags &= ~SDL_SRCALPHA;
}
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return status;
}
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int
SDL_GetSurfaceBlendMode(SDL_Surface * surface, int *blendMode)
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{
if (!surface) {
return -1;
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if (!blendMode) {
return 0;
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switch (surface->map->
info.flags & (SDL_COPY_MASK | SDL_COPY_BLEND | SDL_COPY_ADD |
SDL_COPY_MOD)) {
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case SDL_COPY_MASK:
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*blendMode = SDL_BLENDMODE_MASK;
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break;
case SDL_COPY_BLEND:
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*blendMode = SDL_BLENDMODE_BLEND;
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break;
case SDL_COPY_ADD:
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*blendMode = SDL_BLENDMODE_ADD;
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break;
case SDL_COPY_MOD:
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*blendMode = SDL_BLENDMODE_MOD;
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break;
default:
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*blendMode = SDL_BLENDMODE_NONE;
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return 0;
}
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int
SDL_SetSurfaceScaleMode(SDL_Surface * surface, int scaleMode)
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{
int flags, status;
if (!surface) {
return -1;
}
status = 0;
flags = surface->map->info.flags;
surface->map->info.flags &= ~(SDL_COPY_NEAREST);
switch (scaleMode) {
case SDL_TEXTURESCALEMODE_NONE:
break;
case SDL_TEXTURESCALEMODE_FAST:
surface->map->info.flags |= SDL_COPY_NEAREST;
break;
case SDL_TEXTURESCALEMODE_SLOW:
case SDL_TEXTURESCALEMODE_BEST:
SDL_Unsupported();
surface->map->info.flags |= SDL_COPY_NEAREST;
status = -1;
break;
default:
SDL_Unsupported();
status = -1;
break;
}
if (surface->map->info.flags != flags) {
SDL_InvalidateMap(surface->map);
}
return status;
}
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int
SDL_GetSurfaceScaleMode(SDL_Surface * surface, int *scaleMode)
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{
if (!surface) {
return -1;
}
if (!scaleMode) {
return 0;
}
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switch (surface->map->info.flags & SDL_COPY_NEAREST) {
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case SDL_COPY_NEAREST:
*scaleMode = SDL_TEXTURESCALEMODE_FAST;
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break;
default:
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*scaleMode = SDL_TEXTURESCALEMODE_NONE;
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}
return 0;
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SDL_bool
SDL_SetClipRect(SDL_Surface * surface, const SDL_Rect * rect)
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{
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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 1;
}
return SDL_IntersectRect(rect, &full_rect, &surface->clip_rect);
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}
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void
SDL_GetClipRect(SDL_Surface * surface, SDL_Rect * rect)
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{
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if (surface && rect) {
*rect = surface->clip_rect;
}
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}
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/*
* 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.
*/
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int
SDL_LowerBlit(SDL_Surface * src, SDL_Rect * srcrect,
SDL_Surface * dst, SDL_Rect * dstrect)
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{
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/* 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);
}
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/* just here for debugging */
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/* 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); */
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return (src->map->blit(src, srcrect, dst, dstrect));
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}
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int
SDL_UpperBlit(SDL_Surface * src, SDL_Rect * srcrect,
SDL_Surface * dst, SDL_Rect * dstrect)
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{
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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;
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}
/*
* Lock a surface to directly access the pixels
*/
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int
SDL_LockSurface(SDL_Surface * surface)
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{
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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);
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}
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/*
* Unlock a previously locked surface
*/
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void
SDL_UnlockSurface(SDL_Surface * surface)
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{
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/* 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);
}
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}
/*
* Convert a surface into the specified pixel format.
*/
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SDL_Surface *
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SDL_ConvertSurface(SDL_Surface * surface, SDL_PixelFormat * format,
Uint32 flags)
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{
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SDL_Surface *convert;
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Uint32 copy_flags;
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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 */
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convert = SDL_CreateRGBSurface(flags, surface->w, surface->h,
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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;
}
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/* Save the original copy flags */
copy_flags = surface->map->info.flags;
surface->map->info.flags = 0;
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/* 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 */
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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;
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if (copy_flags & SDL_COPY_COLORKEY) {
Uint8 keyR, keyG, keyB, keyA;
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SDL_GetRGBA(surface->map->info.colorkey, surface->format, &keyR,
&keyG, &keyB, &keyA);
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SDL_SetColorKey(convert, 1,
SDL_MapRGBA(convert->format, keyR, keyG, keyB, keyA));
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/* This is needed when converting for 3D texture upload */
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SDL_ConvertColorkeyToAlpha(convert);
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SDL_SetClipRect(convert, &surface->clip_rect);
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/* Enable alpha blending by default if the new surface has an
* alpha channel or alpha modulation */
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if ((surface->format->Amask && format->Amask) ||
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(copy_flags & (SDL_COPY_COLORKEY|SDL_COPY_MODULATE_ALPHA))) {
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SDL_SetSurfaceBlendMode(convert, SDL_BLENDMODE_BLEND);
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if ((copy_flags & SDL_COPY_RLE_DESIRED) || (flags & SDL_RLEACCEL)) {
SDL_SetSurfaceRLE(convert, SDL_RLEACCEL);
}
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/* We're ready to go! */
return (convert);
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}
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/*
* 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;
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rect.h = height;
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return SDL_LowerBlit(&src_surface, &rect, &dst_surface, &rect);
}
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/*
* Free a surface created by the above function.
*/
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void
SDL_FreeSurface(SDL_Surface * surface)
973
{
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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);
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#ifdef CHECK_LEAKS
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--surfaces_allocated;