src/video/SDL_surface.c
author Sam Lantinga <slouken@libsdl.org>
Sat, 21 Aug 2004 05:29:45 +0000
changeset 940 bb1588ebe47b
parent 915 01cddd0f2efb
child 1017 c2f2370ac1e5
permissions -rw-r--r--
Date: Sat, 10 Jul 2004 21:02:33 +0200
From: "Philippe Plantier (ayin)"
Subject: [SDL] Problems allocating large surfaces

There are problems when allocating large surfaces using SDL_CreateRGBSurface.

When, for example, we try to allocate a surface wider than 16384 pixels,
the calculation of the pitch overflows; this leads to a surface that
has the w and h flags correctly set, but whose "pixels" buffer is too
small. That may lead to heap corruption.
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2004 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 Library General Public
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    License as published by the Free Software Foundation; either
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    version 2 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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    Library General Public License for more details.
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    You should have received a copy of the GNU Library General Public
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    License along with this library; if not, write to the Free
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    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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#ifdef SAVE_RCSID
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static char rcsid =
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 "@(#) $Id$";
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "SDL_error.h"
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#include "SDL_video.h"
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#include "SDL_sysvideo.h"
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#include "SDL_cursor_c.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_memops.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 * 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_VideoDevice *video = current_video;
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	SDL_VideoDevice *this  = current_video;
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	SDL_Surface *screen;
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	SDL_Surface *surface;
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	/* Make sure the size requested doesn't overflow our datatypes */
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	/* Next time I write a library like SDL, I'll use int for size. :) */
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	if ( width > 16384 || height > 16384 ) {
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		SDL_SetError("Width or height is too large");
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		return(NULL);
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	}
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	/* Check to see if we desire the surface in video memory */
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	if ( video ) {
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		screen = SDL_PublicSurface;
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	} else {
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		screen = NULL;
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	}
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	if ( screen && ((screen->flags&SDL_HWSURFACE) == SDL_HWSURFACE) ) {
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		if ( (flags&(SDL_SRCCOLORKEY|SDL_SRCALPHA)) != 0 ) {
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			flags |= SDL_HWSURFACE;
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		}
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		if ( (flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY ) {
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			if ( ! current_video->info.blit_hw_CC ) {
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				flags &= ~SDL_HWSURFACE;
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			}
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		}
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		if ( (flags & SDL_SRCALPHA) == SDL_SRCALPHA ) {
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			if ( ! current_video->info.blit_hw_A ) {
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				flags &= ~SDL_HWSURFACE;
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			}
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		}
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	} else {
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		flags &= ~SDL_HWSURFACE;
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	}
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	/* Allocate the surface */
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	surface = (SDL_Surface *)malloc(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->flags = SDL_SWSURFACE;
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	if ( (flags & SDL_HWSURFACE) == SDL_HWSURFACE ) {
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		depth = screen->format->BitsPerPixel;
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		Rmask = screen->format->Rmask;
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		Gmask = screen->format->Gmask;
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		Bmask = screen->format->Bmask;
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		Amask = screen->format->Amask;
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	}
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	surface->format = SDL_AllocFormat(depth, Rmask, Gmask, Bmask, Amask);
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	if ( surface->format == NULL ) {
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		free(surface);
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		return(NULL);
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	}
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	if ( Amask ) {
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		surface->flags |= SDL_SRCALPHA;
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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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	surface->pixels = NULL;
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	surface->offset = 0;
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	surface->hwdata = NULL;
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	surface->locked = 0;
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	surface->map = NULL;
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	surface->unused1 = 0;
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	SDL_SetClipRect(surface, NULL);
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	SDL_FormatChanged(surface);
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	/* Get the pixels */
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	if ( ((flags&SDL_HWSURFACE) == SDL_SWSURFACE) || 
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				(video->AllocHWSurface(this, surface) < 0) ) {
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		if ( surface->w && surface->h ) {
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			surface->pixels = malloc(surface->h*surface->pitch);
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			if ( surface->pixels == NULL ) {
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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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			memset(surface->pixels, 0, surface->h*surface->pitch);
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		}
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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 == NULL ) {
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		SDL_FreeSurface(surface);
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		return(NULL);
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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 * 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, Uint32 Amask)
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{
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	SDL_Surface *surface;
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	surface = SDL_CreateRGBSurface(SDL_SWSURFACE, 0, 0, depth,
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	                               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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/*
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 * Set the color key in a blittable surface
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 */
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int SDL_SetColorKey (SDL_Surface *surface, Uint32 flag, Uint32 key)
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{
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	/* Sanity check the flag as it gets passed in */
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	if ( flag & SDL_SRCCOLORKEY ) {
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		if ( flag & (SDL_RLEACCEL|SDL_RLEACCELOK) ) {
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			flag = (SDL_SRCCOLORKEY | SDL_RLEACCELOK);
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		} else {
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			flag = SDL_SRCCOLORKEY;
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		}
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	} else {
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		flag = 0;
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	}
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	/* Optimize away operations that don't change anything */
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	if ( (flag == (surface->flags & (SDL_SRCCOLORKEY|SDL_RLEACCELOK))) &&
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	     (key == surface->format->colorkey) ) {
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		return(0);
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	}
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	/* UnRLE surfaces before we change the colorkey */
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	if ( surface->flags & SDL_RLEACCEL ) {
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	        SDL_UnRLESurface(surface, 1);
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	}
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	if ( flag ) {
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		SDL_VideoDevice *video = current_video;
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		SDL_VideoDevice *this  = current_video;
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		surface->flags |= SDL_SRCCOLORKEY;
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		surface->format->colorkey = key;
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		if ( (surface->flags & SDL_HWACCEL) == SDL_HWACCEL ) {
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			if ( (video->SetHWColorKey == NULL) ||
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			     (video->SetHWColorKey(this, surface, key) < 0) ) {
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				surface->flags &= ~SDL_HWACCEL;
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			}
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		}
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		if ( flag & SDL_RLEACCELOK ) {
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			surface->flags |= SDL_RLEACCELOK;
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		} else {
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			surface->flags &= ~SDL_RLEACCELOK;
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		}
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	} else {
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		surface->flags &= ~(SDL_SRCCOLORKEY|SDL_RLEACCELOK);
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		surface->format->colorkey = 0;
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	}
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	SDL_InvalidateMap(surface->map);
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	return(0);
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}
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/* This function sets the alpha channel of a surface */
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int SDL_SetAlpha (SDL_Surface *surface, Uint32 flag, Uint8 value)
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{
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	Uint32 oldflags = surface->flags;
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	Uint32 oldalpha = surface->format->alpha;
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	/* Sanity check the flag as it gets passed in */
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	if ( flag & SDL_SRCALPHA ) {
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		if ( flag & (SDL_RLEACCEL|SDL_RLEACCELOK) ) {
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			flag = (SDL_SRCALPHA | SDL_RLEACCELOK);
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		} else {
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			flag = SDL_SRCALPHA;
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		}
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	} else {
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		flag = 0;
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	}
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	/* Optimize away operations that don't change anything */
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	if ( (flag == (surface->flags & (SDL_SRCALPHA|SDL_RLEACCELOK))) &&
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	     (!flag || value == oldalpha) ) {
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		return(0);
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	}
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	if(!(flag & SDL_RLEACCELOK) && (surface->flags & SDL_RLEACCEL))
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		SDL_UnRLESurface(surface, 1);
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	if ( flag ) {
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		SDL_VideoDevice *video = current_video;
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		SDL_VideoDevice *this  = current_video;
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		surface->flags |= SDL_SRCALPHA;
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		surface->format->alpha = value;
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		if ( (surface->flags & SDL_HWACCEL) == SDL_HWACCEL ) {
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			if ( (video->SetHWAlpha == NULL) ||
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			     (video->SetHWAlpha(this, surface, value) < 0) ) {
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				surface->flags &= ~SDL_HWACCEL;
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			}
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		}
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		if ( flag & SDL_RLEACCELOK ) {
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		        surface->flags |= SDL_RLEACCELOK;
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		} else {
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		        surface->flags &= ~SDL_RLEACCELOK;
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		}
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	} else {
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		surface->flags &= ~SDL_SRCALPHA;
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		surface->format->alpha = SDL_ALPHA_OPAQUE;
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	}
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	/*
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	 * The representation for software surfaces is independent of
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	 * per-surface alpha, so no need to invalidate the blit mapping
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	 * if just the alpha value was changed. (If either is 255, we still
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	 * need to invalidate.)
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	 */
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	if((surface->flags & SDL_HWACCEL) == SDL_HWACCEL
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	   || oldflags != surface->flags
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	   || (((oldalpha + 1) ^ (value + 1)) & 0x100))
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		SDL_InvalidateMap(surface->map);
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	return(0);
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}
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int SDL_SetAlphaChannel(SDL_Surface *surface, Uint8 value)
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{
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	int row, col;
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	int offset;
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	Uint8 *buf;
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	if ( (surface->format->Amask != 0xFF000000) &&
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	     (surface->format->Amask != 0x000000FF) ) {
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		SDL_SetError("Unsupported surface alpha mask format");
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		return -1;
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	}
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#if SDL_BYTEORDER == SDL_LIL_ENDIAN
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	if ( surface->format->Amask == 0xFF000000 ) {
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			offset = 3;
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	} else {
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			offset = 0;
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	}
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#else
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	if ( surface->format->Amask == 0xFF000000 ) {
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			offset = 0;
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	} else {
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			offset = 3;
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	}
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#endif /* Byte ordering */
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	/* Quickly set the alpha channel of an RGBA or ARGB surface */
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	if ( SDL_MUSTLOCK(surface) ) {
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		if ( SDL_LockSurface(surface) < 0 ) {
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			return -1;
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		}
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	}
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	row = surface->h;
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	while (row--) {
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		col = surface->w;
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		buf = (Uint8 *)surface->pixels + row * surface->pitch + offset;
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		while(col--) {
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			*buf = value;
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			buf += 4;
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		}
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	}
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	if ( SDL_MUSTLOCK(surface) ) {
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		SDL_UnlockSurface(surface);
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	}
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	return 0;
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}
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/*
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 * A function to calculate the intersection of two rectangles:
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 * return true if the rectangles intersect, false otherwise
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 */
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static __inline__
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SDL_bool SDL_IntersectRect(const SDL_Rect *A, const SDL_Rect *B, SDL_Rect *intersection)
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{
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	int Amin, Amax, Bmin, Bmax;
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	/* Horizontal intersection */
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	Amin = A->x;
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	Amax = Amin + A->w;
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	Bmin = B->x;
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	Bmax = Bmin + B->w;
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	if(Bmin > Amin)
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	        Amin = Bmin;
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	intersection->x = Amin;
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	if(Bmax < Amax)
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	        Amax = Bmax;
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	intersection->w = Amax - Amin > 0 ? Amax - Amin : 0;
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	/* Vertical intersection */
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	Amin = A->y;
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	Amax = Amin + A->h;
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	Bmin = B->y;
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	Bmax = Bmin + B->h;
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	if(Bmin > Amin)
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	        Amin = Bmin;
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	intersection->y = Amin;
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	if(Bmax < Amax)
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	        Amax = Bmax;
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	intersection->h = Amax - Amin > 0 ? Amax - Amin : 0;
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	return (intersection->w && intersection->h);
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}
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/*
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 * Set the clipping rectangle for a blittable surface
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 */
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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;
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slouken@0
   370
	/* Don't do anything if there's no surface to act on */
slouken@0
   371
	if ( ! surface ) {
slouken@0
   372
		return SDL_FALSE;
slouken@0
   373
	}
slouken@0
   374
slouken@0
   375
	/* Set up the full surface rectangle */
slouken@0
   376
	full_rect.x = 0;
slouken@0
   377
	full_rect.y = 0;
slouken@0
   378
	full_rect.w = surface->w;
slouken@0
   379
	full_rect.h = surface->h;
slouken@0
   380
slouken@0
   381
	/* Set the clipping rectangle */
slouken@0
   382
	if ( ! rect ) {
slouken@0
   383
		surface->clip_rect = full_rect;
slouken@0
   384
		return 1;
slouken@0
   385
	}
slouken@0
   386
	return SDL_IntersectRect(rect, &full_rect, &surface->clip_rect);
slouken@0
   387
}
slouken@0
   388
void SDL_GetClipRect(SDL_Surface *surface, SDL_Rect *rect)
slouken@0
   389
{
slouken@0
   390
	if ( surface && rect ) {
slouken@0
   391
		*rect = surface->clip_rect;
slouken@0
   392
	}
slouken@0
   393
}
slouken@0
   394
/* 
slouken@0
   395
 * Set up a blit between two surfaces -- split into three parts:
slouken@0
   396
 * The upper part, SDL_UpperBlit(), performs clipping and rectangle 
slouken@0
   397
 * verification.  The lower part is a pointer to a low level
slouken@0
   398
 * accelerated blitting function.
slouken@0
   399
 *
slouken@0
   400
 * These parts are separated out and each used internally by this 
slouken@0
   401
 * library in the optimimum places.  They are exported so that if
slouken@0
   402
 * you know exactly what you are doing, you can optimize your code
slouken@0
   403
 * by calling the one(s) you need.
slouken@0
   404
 */
slouken@0
   405
int SDL_LowerBlit (SDL_Surface *src, SDL_Rect *srcrect,
slouken@0
   406
				SDL_Surface *dst, SDL_Rect *dstrect)
slouken@0
   407
{
slouken@0
   408
	SDL_blit do_blit;
slouken@462
   409
	SDL_Rect hw_srcrect;
slouken@462
   410
	SDL_Rect hw_dstrect;
slouken@0
   411
slouken@0
   412
	/* Check to make sure the blit mapping is valid */
slouken@0
   413
	if ( (src->map->dst != dst) ||
slouken@0
   414
             (src->map->dst->format_version != src->map->format_version) ) {
slouken@0
   415
		if ( SDL_MapSurface(src, dst) < 0 ) {
slouken@0
   416
			return(-1);
slouken@0
   417
		}
slouken@0
   418
	}
slouken@0
   419
slouken@0
   420
	/* Figure out which blitter to use */
slouken@0
   421
	if ( (src->flags & SDL_HWACCEL) == SDL_HWACCEL ) {
slouken@462
   422
		if ( src == SDL_VideoSurface ) {
slouken@519
   423
			hw_srcrect = *srcrect;
slouken@462
   424
			hw_srcrect.x += current_video->offset_x;
slouken@462
   425
			hw_srcrect.y += current_video->offset_y;
slouken@462
   426
			srcrect = &hw_srcrect;
slouken@462
   427
		}
slouken@462
   428
		if ( dst == SDL_VideoSurface ) {
slouken@462
   429
			hw_dstrect = *dstrect;
slouken@462
   430
			hw_dstrect.x += current_video->offset_x;
slouken@462
   431
			hw_dstrect.y += current_video->offset_y;
slouken@462
   432
			dstrect = &hw_dstrect;
slouken@462
   433
		}
slouken@0
   434
		do_blit = src->map->hw_blit;
slouken@0
   435
	} else {
slouken@0
   436
		do_blit = src->map->sw_blit;
slouken@0
   437
	}
slouken@0
   438
	return(do_blit(src, srcrect, dst, dstrect));
slouken@0
   439
}
slouken@0
   440
slouken@0
   441
slouken@0
   442
int SDL_UpperBlit (SDL_Surface *src, SDL_Rect *srcrect,
slouken@0
   443
		   SDL_Surface *dst, SDL_Rect *dstrect)
slouken@0
   444
{
slouken@0
   445
        SDL_Rect fulldst;
slouken@0
   446
	int srcx, srcy, w, h;
slouken@0
   447
slouken@0
   448
	/* Make sure the surfaces aren't locked */
slouken@0
   449
	if ( ! src || ! dst ) {
slouken@0
   450
		SDL_SetError("SDL_UpperBlit: passed a NULL surface");
slouken@0
   451
		return(-1);
slouken@0
   452
	}
slouken@0
   453
	if ( src->locked || dst->locked ) {
slouken@0
   454
		SDL_SetError("Surfaces must not be locked during blit");
slouken@0
   455
		return(-1);
slouken@0
   456
	}
slouken@0
   457
slouken@0
   458
	/* If the destination rectangle is NULL, use the entire dest surface */
slouken@0
   459
	if ( dstrect == NULL ) {
slouken@0
   460
	        fulldst.x = fulldst.y = 0;
slouken@0
   461
		dstrect = &fulldst;
slouken@0
   462
	}
slouken@0
   463
slouken@0
   464
	/* clip the source rectangle to the source surface */
slouken@0
   465
	if(srcrect) {
slouken@0
   466
	        int maxw, maxh;
slouken@0
   467
	
slouken@0
   468
		srcx = srcrect->x;
slouken@0
   469
		w = srcrect->w;
slouken@0
   470
		if(srcx < 0) {
slouken@0
   471
		        w += srcx;
slouken@0
   472
			dstrect->x -= srcx;
slouken@0
   473
			srcx = 0;
slouken@0
   474
		}
slouken@0
   475
		maxw = src->w - srcx;
slouken@0
   476
		if(maxw < w)
slouken@0
   477
			w = maxw;
slouken@0
   478
slouken@0
   479
		srcy = srcrect->y;
slouken@0
   480
		h = srcrect->h;
slouken@0
   481
		if(srcy < 0) {
slouken@0
   482
		        h += srcy;
slouken@0
   483
			dstrect->y -= srcy;
slouken@0
   484
			srcy = 0;
slouken@0
   485
		}
slouken@0
   486
		maxh = src->h - srcy;
slouken@0
   487
		if(maxh < h)
slouken@0
   488
			h = maxh;
slouken@0
   489
	    
slouken@0
   490
	} else {
slouken@0
   491
	        srcx = srcy = 0;
slouken@0
   492
		w = src->w;
slouken@0
   493
		h = src->h;
slouken@0
   494
	}
slouken@0
   495
slouken@0
   496
	/* clip the destination rectangle against the clip rectangle */
slouken@0
   497
	{
slouken@0
   498
	        SDL_Rect *clip = &dst->clip_rect;
slouken@0
   499
		int dx, dy;
slouken@0
   500
slouken@0
   501
		dx = clip->x - dstrect->x;
slouken@0
   502
		if(dx > 0) {
slouken@0
   503
			w -= dx;
slouken@0
   504
			dstrect->x += dx;
slouken@0
   505
			srcx += dx;
slouken@0
   506
		}
slouken@0
   507
		dx = dstrect->x + w - clip->x - clip->w;
slouken@0
   508
		if(dx > 0)
slouken@0
   509
			w -= dx;
slouken@0
   510
slouken@0
   511
		dy = clip->y - dstrect->y;
slouken@0
   512
		if(dy > 0) {
slouken@0
   513
			h -= dy;
slouken@0
   514
			dstrect->y += dy;
slouken@0
   515
			srcy += dy;
slouken@0
   516
		}
slouken@0
   517
		dy = dstrect->y + h - clip->y - clip->h;
slouken@0
   518
		if(dy > 0)
slouken@0
   519
			h -= dy;
slouken@0
   520
	}
slouken@0
   521
slouken@0
   522
	if(w > 0 && h > 0) {
slouken@0
   523
	        SDL_Rect sr;
slouken@0
   524
	        sr.x = srcx;
slouken@0
   525
		sr.y = srcy;
slouken@0
   526
		sr.w = dstrect->w = w;
slouken@0
   527
		sr.h = dstrect->h = h;
slouken@0
   528
		return SDL_LowerBlit(src, &sr, dst, dstrect);
slouken@0
   529
	}
slouken@0
   530
	dstrect->w = dstrect->h = 0;
slouken@0
   531
	return 0;
slouken@0
   532
}
slouken@0
   533
slouken@532
   534
static int SDL_FillRect1(SDL_Surface *dst, SDL_Rect *dstrect, Uint32 color)
slouken@532
   535
{
slouken@532
   536
	/* FIXME: We have to worry about packing order.. *sigh* */
slouken@532
   537
	SDL_SetError("1-bpp rect fill not yet implemented");
slouken@532
   538
	return -1;
slouken@532
   539
}
slouken@532
   540
slouken@532
   541
static int SDL_FillRect4(SDL_Surface *dst, SDL_Rect *dstrect, Uint32 color)
slouken@532
   542
{
slouken@532
   543
	/* FIXME: We have to worry about packing order.. *sigh* */
slouken@532
   544
	SDL_SetError("4-bpp rect fill not yet implemented");
slouken@532
   545
	return -1;
slouken@532
   546
}
slouken@532
   547
slouken@0
   548
/* 
slouken@0
   549
 * This function performs a fast fill of the given rectangle with 'color'
slouken@0
   550
 */
slouken@0
   551
int SDL_FillRect(SDL_Surface *dst, SDL_Rect *dstrect, Uint32 color)
slouken@0
   552
{
slouken@0
   553
	SDL_VideoDevice *video = current_video;
slouken@0
   554
	SDL_VideoDevice *this  = current_video;
slouken@0
   555
	int x, y;
slouken@0
   556
	Uint8 *row;
slouken@0
   557
slouken@532
   558
	/* This function doesn't work on surfaces < 8 bpp */
slouken@532
   559
	if ( dst->format->BitsPerPixel < 8 ) {
slouken@532
   560
		switch(dst->format->BitsPerPixel) {
slouken@532
   561
		    case 1:
slouken@532
   562
			return SDL_FillRect1(dst, dstrect, color);
slouken@532
   563
			break;
slouken@532
   564
		    case 4:
slouken@532
   565
			return SDL_FillRect4(dst, dstrect, color);
slouken@532
   566
			break;
slouken@532
   567
		    default:
slouken@532
   568
			SDL_SetError("Fill rect on unsupported surface format");
slouken@532
   569
			return(-1);
slouken@532
   570
			break;
slouken@532
   571
		}
slouken@532
   572
	}
slouken@532
   573
slouken@0
   574
	/* If 'dstrect' == NULL, then fill the whole surface */
slouken@0
   575
	if ( dstrect ) {
slouken@0
   576
		/* Perform clipping */
slouken@0
   577
		if ( !SDL_IntersectRect(dstrect, &dst->clip_rect, dstrect) ) {
slouken@0
   578
			return(0);
slouken@0
   579
		}
slouken@0
   580
	} else {
slouken@0
   581
		dstrect = &dst->clip_rect;
slouken@0
   582
	}
slouken@0
   583
slouken@0
   584
	/* Check for hardware acceleration */
slouken@0
   585
	if ( ((dst->flags & SDL_HWSURFACE) == SDL_HWSURFACE) &&
slouken@0
   586
					video->info.blit_fill ) {
slouken@462
   587
		SDL_Rect hw_rect;
slouken@462
   588
		if ( dst == SDL_VideoSurface ) {
slouken@462
   589
			hw_rect = *dstrect;
slouken@462
   590
			hw_rect.x += current_video->offset_x;
slouken@462
   591
			hw_rect.y += current_video->offset_y;
slouken@462
   592
			dstrect = &hw_rect;
slouken@462
   593
		}
slouken@0
   594
		return(video->FillHWRect(this, dst, dstrect, color));
slouken@0
   595
	}
slouken@0
   596
slouken@0
   597
	/* Perform software fill */
slouken@0
   598
	if ( SDL_LockSurface(dst) != 0 ) {
slouken@0
   599
		return(-1);
slouken@0
   600
	}
slouken@0
   601
	row = (Uint8 *)dst->pixels+dstrect->y*dst->pitch+
slouken@0
   602
			dstrect->x*dst->format->BytesPerPixel;
slouken@0
   603
	if ( dst->format->palette || (color == 0) ) {
slouken@0
   604
		x = dstrect->w*dst->format->BytesPerPixel;
slouken@0
   605
		if ( !color && !((long)row&3) && !(x&3) && !(dst->pitch&3) ) {
slouken@0
   606
			int n = x >> 2;
slouken@0
   607
			for ( y=dstrect->h; y; --y ) {
slouken@0
   608
				SDL_memset4(row, 0, n);
slouken@0
   609
				row += dst->pitch;
slouken@0
   610
			}
slouken@0
   611
		} else {
slouken@0
   612
#ifdef __powerpc__
slouken@0
   613
			/*
slouken@0
   614
			 * memset() on PPC (both glibc and codewarrior) uses
slouken@0
   615
			 * the dcbz (Data Cache Block Zero) instruction, which
slouken@0
   616
			 * causes an alignment exception if the destination is
slouken@0
   617
			 * uncachable, so only use it on software surfaces
slouken@0
   618
			 */
slouken@0
   619
			if((dst->flags & SDL_HWSURFACE) == SDL_HWSURFACE) {
slouken@0
   620
				if(dstrect->w >= 8) {
slouken@0
   621
					/*
slouken@0
   622
					 * 64-bit stores are probably most
slouken@0
   623
					 * efficient to uncached video memory
slouken@0
   624
					 */
slouken@0
   625
					double fill;
slouken@0
   626
					memset(&fill, color, (sizeof fill));
slouken@0
   627
					for(y = dstrect->h; y; y--) {
slouken@0
   628
						Uint8 *d = row;
slouken@0
   629
						unsigned n = x;
slouken@0
   630
						unsigned nn;
slouken@0
   631
						Uint8 c = color;
slouken@0
   632
						double f = fill;
slouken@0
   633
						while((unsigned long)d
slouken@0
   634
						      & (sizeof(double) - 1)) {
slouken@0
   635
							*d++ = c;
slouken@0
   636
							n--;
slouken@0
   637
						}
slouken@0
   638
						nn = n / (sizeof(double) * 4);
slouken@0
   639
						while(nn) {
slouken@0
   640
							((double *)d)[0] = f;
slouken@0
   641
							((double *)d)[1] = f;
slouken@0
   642
							((double *)d)[2] = f;
slouken@0
   643
							((double *)d)[3] = f;
slouken@0
   644
							d += 4*sizeof(double);
slouken@0
   645
							nn--;
slouken@0
   646
						}
slouken@0
   647
						n &= ~(sizeof(double) * 4 - 1);
slouken@0
   648
						nn = n / sizeof(double);
slouken@0
   649
						while(nn) {
slouken@0
   650
							*(double *)d = f;
slouken@0
   651
							d += sizeof(double);
slouken@0
   652
							nn--;
slouken@0
   653
						}
slouken@0
   654
						n &= ~(sizeof(double) - 1);
slouken@0
   655
						while(n) {
slouken@0
   656
							*d++ = c;
slouken@0
   657
							n--;
slouken@0
   658
						}
slouken@0
   659
						row += dst->pitch;
slouken@0
   660
					}
slouken@0
   661
				} else {
slouken@0
   662
					/* narrow boxes */
slouken@0
   663
					for(y = dstrect->h; y; y--) {
slouken@0
   664
						Uint8 *d = row;
slouken@0
   665
						Uint8 c = color;
slouken@0
   666
						int n = x;
slouken@0
   667
						while(n) {
slouken@0
   668
							*d++ = c;
slouken@0
   669
							n--;
slouken@0
   670
						}
slouken@0
   671
						row += dst->pitch;
slouken@0
   672
					}
slouken@0
   673
				}
slouken@0
   674
			} else
slouken@0
   675
#endif /* __powerpc__ */
slouken@0
   676
			{
slouken@0
   677
				for(y = dstrect->h; y; y--) {
slouken@0
   678
					memset(row, color, x);
slouken@0
   679
					row += dst->pitch;
slouken@0
   680
				}
slouken@0
   681
			}
slouken@0
   682
		}
slouken@0
   683
	} else {
slouken@0
   684
		switch (dst->format->BytesPerPixel) {
slouken@0
   685
		    case 2:
slouken@0
   686
			for ( y=dstrect->h; y; --y ) {
slouken@0
   687
				Uint16 *pixels = (Uint16 *)row;
slouken@0
   688
				Uint16 c = color;
slouken@0
   689
				Uint32 cc = (Uint32)c << 16 | c;
slouken@0
   690
				int n = dstrect->w;
slouken@0
   691
				if((unsigned long)pixels & 3) {
slouken@0
   692
					*pixels++ = c;
slouken@0
   693
					n--;
slouken@0
   694
				}
slouken@0
   695
				if(n >> 1)
slouken@0
   696
					SDL_memset4(pixels, cc, n >> 1);
slouken@0
   697
				if(n & 1)
slouken@0
   698
					pixels[n - 1] = c;
slouken@0
   699
				row += dst->pitch;
slouken@0
   700
			}
slouken@0
   701
			break;
slouken@0
   702
slouken@0
   703
		    case 3:
slouken@0
   704
			if(SDL_BYTEORDER == SDL_BIG_ENDIAN)
slouken@0
   705
				color <<= 8;
slouken@0
   706
			for ( y=dstrect->h; y; --y ) {
slouken@0
   707
				Uint8 *pixels = row;
slouken@0
   708
				for ( x=dstrect->w; x; --x ) {
slouken@0
   709
					memcpy(pixels, &color, 3);
slouken@0
   710
					pixels += 3;
slouken@0
   711
				}
slouken@0
   712
				row += dst->pitch;
slouken@0
   713
			}
slouken@0
   714
			break;
slouken@0
   715
slouken@0
   716
		    case 4:
slouken@0
   717
			for(y = dstrect->h; y; --y) {
slouken@0
   718
				SDL_memset4(row, color, dstrect->w);
slouken@0
   719
				row += dst->pitch;
slouken@0
   720
			}
slouken@0
   721
			break;
slouken@0
   722
		}
slouken@0
   723
	}
slouken@0
   724
	SDL_UnlockSurface(dst);
slouken@0
   725
slouken@0
   726
	/* We're done! */
slouken@0
   727
	return(0);
slouken@0
   728
}
slouken@0
   729
slouken@0
   730
/*
slouken@0
   731
 * Lock a surface to directly access the pixels
slouken@0
   732
 */
slouken@0
   733
int SDL_LockSurface (SDL_Surface *surface)
slouken@0
   734
{
slouken@0
   735
	if ( ! surface->locked ) {
slouken@0
   736
		/* Perform the lock */
slouken@0
   737
		if ( surface->flags & (SDL_HWSURFACE|SDL_ASYNCBLIT) ) {
slouken@0
   738
			SDL_VideoDevice *video = current_video;
slouken@0
   739
			SDL_VideoDevice *this  = current_video;
slouken@0
   740
			if ( video->LockHWSurface(this, surface) < 0 ) {
slouken@0
   741
				return(-1);
slouken@0
   742
			}
slouken@0
   743
		}
slouken@0
   744
		if ( surface->flags & SDL_RLEACCEL ) {
slouken@0
   745
			SDL_UnRLESurface(surface, 1);
slouken@0
   746
			surface->flags |= SDL_RLEACCEL;	/* save accel'd state */
slouken@0
   747
		}
slouken@0
   748
		/* This needs to be done here in case pixels changes value */
slouken@0
   749
		surface->pixels = (Uint8 *)surface->pixels + surface->offset;
slouken@0
   750
	}
slouken@0
   751
slouken@0
   752
	/* Increment the surface lock count, for recursive locks */
slouken@0
   753
	++surface->locked;
slouken@0
   754
slouken@0
   755
	/* Ready to go.. */
slouken@0
   756
	return(0);
slouken@0
   757
}
slouken@0
   758
/*
slouken@0
   759
 * Unlock a previously locked surface
slouken@0
   760
 */
slouken@0
   761
void SDL_UnlockSurface (SDL_Surface *surface)
slouken@0
   762
{
slouken@0
   763
	/* Only perform an unlock if we are locked */
slouken@0
   764
	if ( ! surface->locked || (--surface->locked > 0) ) {
slouken@0
   765
		return;
slouken@0
   766
	}
slouken@0
   767
slouken@0
   768
	/* Perform the unlock */
slouken@0
   769
	surface->pixels = (Uint8 *)surface->pixels - surface->offset;
slouken@0
   770
slouken@0
   771
	/* Unlock hardware or accelerated surfaces */
slouken@0
   772
	if ( surface->flags & (SDL_HWSURFACE|SDL_ASYNCBLIT) ) {
slouken@0
   773
		SDL_VideoDevice *video = current_video;
slouken@0
   774
		SDL_VideoDevice *this  = current_video;
slouken@0
   775
		video->UnlockHWSurface(this, surface);
slouken@0
   776
	} else {
slouken@0
   777
		/* Update RLE encoded surface with new data */
slouken@0
   778
		if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) {
slouken@0
   779
		        surface->flags &= ~SDL_RLEACCEL; /* stop lying */
slouken@0
   780
			SDL_RLESurface(surface);
slouken@0
   781
		}
slouken@0
   782
	}
slouken@0
   783
}
slouken@0
   784
slouken@0
   785
/* 
slouken@0
   786
 * Convert a surface into the specified pixel format.
slouken@0
   787
 */
slouken@0
   788
SDL_Surface * SDL_ConvertSurface (SDL_Surface *surface,
slouken@0
   789
					SDL_PixelFormat *format, Uint32 flags)
slouken@0
   790
{
slouken@0
   791
	SDL_Surface *convert;
slouken@0
   792
	Uint32 colorkey = 0;
slouken@0
   793
	Uint8 alpha = 0;
slouken@0
   794
	Uint32 surface_flags;
slouken@0
   795
	SDL_Rect bounds;
slouken@0
   796
slouken@0
   797
	/* Check for empty destination palette! (results in empty image) */
slouken@0
   798
	if ( format->palette != NULL ) {
slouken@0
   799
		int i;
slouken@0
   800
		for ( i=0; i<format->palette->ncolors; ++i ) {
slouken@0
   801
			if ( (format->palette->colors[i].r != 0) ||
slouken@0
   802
			     (format->palette->colors[i].g != 0) ||
slouken@0
   803
			     (format->palette->colors[i].b != 0) )
slouken@0
   804
				break;
slouken@0
   805
		}
slouken@0
   806
		if ( i == format->palette->ncolors ) {
slouken@0
   807
			SDL_SetError("Empty destination palette");
slouken@0
   808
			return(NULL);
slouken@0
   809
		}
slouken@0
   810
	}
slouken@0
   811
slouken@264
   812
	/* Only create hw surfaces with alpha channel if hw alpha blits
slouken@264
   813
	   are supported */
slouken@264
   814
	if(format->Amask != 0 && (flags & SDL_HWSURFACE)) {
slouken@264
   815
		const SDL_VideoInfo *vi = SDL_GetVideoInfo();
slouken@264
   816
		if(!vi || !vi->blit_hw_A)
slouken@264
   817
			flags &= ~SDL_HWSURFACE;
slouken@264
   818
	}
slouken@264
   819
slouken@0
   820
	/* Create a new surface with the desired format */
slouken@0
   821
	convert = SDL_CreateRGBSurface(flags,
slouken@0
   822
				surface->w, surface->h, format->BitsPerPixel,
slouken@0
   823
		format->Rmask, format->Gmask, format->Bmask, format->Amask);
slouken@0
   824
	if ( convert == NULL ) {
slouken@0
   825
		return(NULL);
slouken@0
   826
	}
slouken@0
   827
slouken@0
   828
	/* Copy the palette if any */
slouken@0
   829
	if ( format->palette && convert->format->palette ) {
slouken@0
   830
		memcpy(convert->format->palette->colors,
slouken@0
   831
				format->palette->colors,
slouken@0
   832
				format->palette->ncolors*sizeof(SDL_Color));
slouken@0
   833
		convert->format->palette->ncolors = format->palette->ncolors;
slouken@0
   834
	}
slouken@0
   835
slouken@0
   836
	/* Save the original surface color key and alpha */
slouken@0
   837
	surface_flags = surface->flags;
slouken@0
   838
	if ( (surface_flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY ) {
slouken@0
   839
		/* Convert colourkeyed surfaces to RGBA if requested */
slouken@0
   840
		if((flags & SDL_SRCCOLORKEY) != SDL_SRCCOLORKEY
slouken@0
   841
		   && format->Amask) {
slouken@0
   842
			surface_flags &= ~SDL_SRCCOLORKEY;
slouken@0
   843
		} else {
slouken@0
   844
			colorkey = surface->format->colorkey;
slouken@0
   845
			SDL_SetColorKey(surface, 0, 0);
slouken@0
   846
		}
slouken@0
   847
	}
slouken@0
   848
	if ( (surface_flags & SDL_SRCALPHA) == SDL_SRCALPHA ) {
slouken@431
   849
		/* Copy over the alpha channel to RGBA if requested */
slouken@431
   850
		if ( format->Amask ) {
slouken@431
   851
			surface->flags &= ~SDL_SRCALPHA;
slouken@431
   852
		} else {
slouken@431
   853
			alpha = surface->format->alpha;
slouken@431
   854
			SDL_SetAlpha(surface, 0, 0);
slouken@431
   855
		}
slouken@0
   856
	}
slouken@0
   857
slouken@0
   858
	/* Copy over the image data */
slouken@0
   859
	bounds.x = 0;
slouken@0
   860
	bounds.y = 0;
slouken@0
   861
	bounds.w = surface->w;
slouken@0
   862
	bounds.h = surface->h;
slouken@0
   863
	SDL_LowerBlit(surface, &bounds, convert, &bounds);
slouken@0
   864
slouken@0
   865
	/* Clean up the original surface, and update converted surface */
slouken@0
   866
	if ( convert != NULL ) {
slouken@0
   867
		SDL_SetClipRect(convert, &surface->clip_rect);
slouken@0
   868
	}
slouken@0
   869
	if ( (surface_flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY ) {
slouken@0
   870
		Uint32 cflags = surface_flags&(SDL_SRCCOLORKEY|SDL_RLEACCELOK);
slouken@0
   871
		if ( convert != NULL ) {
slouken@0
   872
			Uint8 keyR, keyG, keyB;
slouken@0
   873
slouken@0
   874
			SDL_GetRGB(colorkey,surface->format,&keyR,&keyG,&keyB);
slouken@0
   875
			SDL_SetColorKey(convert, cflags|(flags&SDL_RLEACCELOK),
slouken@0
   876
				SDL_MapRGB(convert->format, keyR, keyG, keyB));
slouken@0
   877
		}
slouken@0
   878
		SDL_SetColorKey(surface, cflags, colorkey);
slouken@0
   879
	}
slouken@0
   880
	if ( (surface_flags & SDL_SRCALPHA) == SDL_SRCALPHA ) {
slouken@0
   881
		Uint32 aflags = surface_flags&(SDL_SRCALPHA|SDL_RLEACCELOK);
slouken@0
   882
		if ( convert != NULL ) {
slouken@0
   883
		        SDL_SetAlpha(convert, aflags|(flags&SDL_RLEACCELOK),
slouken@0
   884
				alpha);
slouken@0
   885
		}
slouken@431
   886
		if ( format->Amask ) {
slouken@431
   887
			surface->flags |= SDL_SRCALPHA;
slouken@431
   888
		} else {
slouken@431
   889
			SDL_SetAlpha(surface, aflags, alpha);
slouken@431
   890
		}
slouken@0
   891
	}
slouken@0
   892
slouken@0
   893
	/* We're ready to go! */
slouken@0
   894
	return(convert);
slouken@0
   895
}
slouken@0
   896
slouken@0
   897
/*
slouken@0
   898
 * Free a surface created by the above function.
slouken@0
   899
 */
slouken@0
   900
void SDL_FreeSurface (SDL_Surface *surface)
slouken@0
   901
{
slouken@0
   902
	/* Free anything that's not NULL, and not the screen surface */
slouken@0
   903
	if ((surface == NULL) ||
slouken@0
   904
	    (current_video &&
slouken@0
   905
	    ((surface == SDL_ShadowSurface)||(surface == SDL_VideoSurface)))) {
slouken@0
   906
		return;
slouken@0
   907
	}
slouken@0
   908
	if ( --surface->refcount > 0 ) {
slouken@0
   909
		return;
slouken@0
   910
	}
slouken@915
   911
	while ( surface->locked > 0 ) {
slouken@915
   912
		SDL_UnlockSurface(surface);
slouken@915
   913
	}
slouken@0
   914
	if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) {
slouken@0
   915
	        SDL_UnRLESurface(surface, 0);
slouken@0
   916
	}
slouken@0
   917
	if ( surface->format ) {
slouken@0
   918
		SDL_FreeFormat(surface->format);
slouken@0
   919
		surface->format = NULL;
slouken@0
   920
	}
slouken@0
   921
	if ( surface->map != NULL ) {
slouken@0
   922
		SDL_FreeBlitMap(surface->map);
slouken@0
   923
		surface->map = NULL;
slouken@0
   924
	}
slouken@422
   925
	if ( surface->hwdata ) {
slouken@0
   926
		SDL_VideoDevice *video = current_video;
slouken@0
   927
		SDL_VideoDevice *this  = current_video;
slouken@0
   928
		video->FreeHWSurface(this, surface);
slouken@0
   929
	}
slouken@0
   930
	if ( surface->pixels &&
slouken@0
   931
	     ((surface->flags & SDL_PREALLOC) != SDL_PREALLOC) ) {
slouken@0
   932
		free(surface->pixels);
slouken@0
   933
	}
slouken@0
   934
	free(surface);
slouken@0
   935
#ifdef CHECK_LEAKS
slouken@0
   936
	--surfaces_allocated;
slouken@0
   937
#endif
slouken@0
   938
}