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/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997-2009 Sam Lantinga

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

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
Lesser General Public License for more details.

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

Sam Lantinga
slouken@libsdl.org
*/
#include "SDL_config.h"

#include "SDL_video.h"
#include "SDL_sysvideo.h"
#include "SDL_cursor_c.h"
#include "SDL_blit.h"
#include "SDL_RLEaccel_c.h"
#include "SDL_pixels_c.h"
#include "SDL_leaks.h"


/* Public routines */
/*
* Create an empty RGB surface of the appropriate depth
*/
SDL_Surface * SDL_CreateRGBSurface (Uint32 flags,
int width, int height, int depth,
Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask)
{
SDL_VideoDevice *video = current_video;
SDL_VideoDevice *this = current_video;
SDL_Surface *screen;
SDL_Surface *surface;

/* Make sure the size requested doesn't overflow our datatypes */
/* Next time I write a library like SDL, I'll use int for size. :) */
if ( width >= 16384 || height >= 65536 ) {
SDL_SetError("Width or height is too large");
return(NULL);
}

/* Check to see if we desire the surface in video memory */
if ( video ) {
screen = SDL_PublicSurface;
} else {
screen = NULL;
}
if ( screen && ((screen->flags&SDL_HWSURFACE) == SDL_HWSURFACE) ) {
if ( (flags&(SDL_SRCCOLORKEY|SDL_SRCALPHA)) != 0 ) {
flags |= SDL_HWSURFACE;
}
if ( (flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY ) {
if ( ! current_video->info.blit_hw_CC ) {
flags &= ~SDL_HWSURFACE;
}
}
if ( (flags & SDL_SRCALPHA) == SDL_SRCALPHA ) {
if ( ! current_video->info.blit_hw_A ) {
flags &= ~SDL_HWSURFACE;
}
}
} else {
flags &= ~SDL_HWSURFACE;
}

/* Allocate the surface */
surface = (SDL_Surface *)SDL_malloc(sizeof(*surface));
if ( surface == NULL ) {
SDL_OutOfMemory();
return(NULL);
}
surface->flags = SDL_SWSURFACE;
if ( (flags & SDL_HWSURFACE) == SDL_HWSURFACE ) {
if ((Amask) && (video->displayformatalphapixel))
{
depth = video->displayformatalphapixel->BitsPerPixel;
Rmask = video->displayformatalphapixel->Rmask;
Gmask = video->displayformatalphapixel->Gmask;
Bmask = video->displayformatalphapixel->Bmask;
Amask = video->displayformatalphapixel->Amask;
}
else
{
depth = screen->format->BitsPerPixel;
Rmask = screen->format->Rmask;
Gmask = screen->format->Gmask;
Bmask = screen->format->Bmask;
Amask = screen->format->Amask;
}
}
surface->format = SDL_AllocFormat(depth, Rmask, Gmask, Bmask, Amask);
if ( surface->format == NULL ) {
SDL_free(surface);
return(NULL);
}
if ( Amask ) {
surface->flags |= SDL_SRCALPHA;
}
surface->w = width;
surface->h = height;
surface->pitch = SDL_CalculatePitch(surface);
surface->pixels = NULL;
surface->offset = 0;
surface->hwdata = NULL;
surface->locked = 0;
surface->map = NULL;
surface->unused1 = 0;
SDL_SetClipRect(surface, NULL);
SDL_FormatChanged(surface);

/* Get the pixels */
if ( ((flags&SDL_HWSURFACE) == SDL_SWSURFACE) ||
(video->AllocHWSurface(this, surface) < 0) ) {
if ( surface->w && surface->h ) {
surface->pixels = SDL_malloc(surface->h*surface->pitch);
if ( surface->pixels == NULL ) {
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 == NULL ) {
SDL_FreeSurface(surface);
return(NULL);
}

/* The surface is ready to go */
surface->refcount = 1;
#ifdef CHECK_LEAKS
++surfaces_allocated;
#endif
return(surface);
}
/*
* Create an RGB surface from an existing memory buffer
*/
SDL_Surface * SDL_CreateRGBSurfaceFrom (void *pixels,
int width, int height, int depth, int pitch,
Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask)
{
SDL_Surface *surface;

surface = SDL_CreateRGBSurface(SDL_SWSURFACE, 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);
}
/*
* Set the color key in a blittable surface
*/
int SDL_SetColorKey (SDL_Surface *surface, Uint32 flag, Uint32 key)
{
/* Sanity check the flag as it gets passed in */
if ( flag & SDL_SRCCOLORKEY ) {
if ( flag & (SDL_RLEACCEL|SDL_RLEACCELOK) ) {
flag = (SDL_SRCCOLORKEY | SDL_RLEACCELOK);
} else {
flag = SDL_SRCCOLORKEY;
}
} else {
flag = 0;
}

/* Optimize away operations that don't change anything */
if ( (flag == (surface->flags & (SDL_SRCCOLORKEY|SDL_RLEACCELOK))) &&
(key == surface->format->colorkey) ) {
return(0);
}

/* UnRLE surfaces before we change the colorkey */
if ( surface->flags & SDL_RLEACCEL ) {
SDL_UnRLESurface(surface, 1);
}

if ( flag ) {
SDL_VideoDevice *video = current_video;
SDL_VideoDevice *this = current_video;


surface->flags |= SDL_SRCCOLORKEY;
surface->format->colorkey = key;
if ( (surface->flags & SDL_HWACCEL) == SDL_HWACCEL ) {
if ( (video->SetHWColorKey == NULL) ||
(video->SetHWColorKey(this, surface, key) < 0) ) {
surface->flags &= ~SDL_HWACCEL;
}
}
if ( flag & SDL_RLEACCELOK ) {
surface->flags |= SDL_RLEACCELOK;
} else {
surface->flags &= ~SDL_RLEACCELOK;
}
} else {
surface->flags &= ~(SDL_SRCCOLORKEY|SDL_RLEACCELOK);
surface->format->colorkey = 0;
}
SDL_InvalidateMap(surface->map);
return(0);
}
/* This function sets the alpha channel of a surface */
int SDL_SetAlpha (SDL_Surface *surface, Uint32 flag, Uint8 value)
{
Uint32 oldflags = surface->flags;
Uint32 oldalpha = surface->format->alpha;

/* Sanity check the flag as it gets passed in */
if ( flag & SDL_SRCALPHA ) {
if ( flag & (SDL_RLEACCEL|SDL_RLEACCELOK) ) {
flag = (SDL_SRCALPHA | SDL_RLEACCELOK);
} else {
flag = SDL_SRCALPHA;
}
} else {
flag = 0;
}

/* Optimize away operations that don't change anything */
if ( (flag == (surface->flags & (SDL_SRCALPHA|SDL_RLEACCELOK))) &&
(!flag || value == oldalpha) ) {
return(0);
}

if(!(flag & SDL_RLEACCELOK) && (surface->flags & SDL_RLEACCEL))
SDL_UnRLESurface(surface, 1);

if ( flag ) {
SDL_VideoDevice *video = current_video;
SDL_VideoDevice *this = current_video;

surface->flags |= SDL_SRCALPHA;
surface->format->alpha = value;
if ( (surface->flags & SDL_HWACCEL) == SDL_HWACCEL ) {
if ( (video->SetHWAlpha == NULL) ||
(video->SetHWAlpha(this, surface, value) < 0) ) {
surface->flags &= ~SDL_HWACCEL;
}
}
if ( flag & SDL_RLEACCELOK ) {
surface->flags |= SDL_RLEACCELOK;
} else {
surface->flags &= ~SDL_RLEACCELOK;
}
} else {
surface->flags &= ~SDL_SRCALPHA;
surface->format->alpha = SDL_ALPHA_OPAQUE;
}
/*
* The representation for software surfaces is independent of
* per-surface alpha, so no need to invalidate the blit mapping
* if just the alpha value was changed. (If either is 255, we still
* need to invalidate.)
*/
if((surface->flags & SDL_HWACCEL) == SDL_HWACCEL
|| oldflags != surface->flags
|| (((oldalpha + 1) ^ (value + 1)) & 0x100))
SDL_InvalidateMap(surface->map);
return(0);
}
int SDL_SetAlphaChannel(SDL_Surface *surface, Uint8 value)
{
int row, col;
int offset;
Uint8 *buf;

if ( (surface->format->Amask != 0xFF000000) &&
(surface->format->Amask != 0x000000FF) ) {
SDL_SetError("Unsupported surface alpha mask format");
return -1;
}

#if SDL_BYTEORDER == SDL_LIL_ENDIAN
if ( surface->format->Amask == 0xFF000000 ) {
offset = 3;
} else {
offset = 0;
}
#else
if ( surface->format->Amask == 0xFF000000 ) {
offset = 0;
} else {
offset = 3;
}
#endif /* Byte ordering */

/* Quickly set the alpha channel of an RGBA or ARGB surface */
if ( SDL_MUSTLOCK(surface) ) {
if ( SDL_LockSurface(surface) < 0 ) {
return -1;
}
}
row = surface->h;
while (row--) {
col = surface->w;
buf = (Uint8 *)surface->pixels + row * surface->pitch + offset;
while(col--) {
*buf = value;
buf += 4;
}
}
if ( SDL_MUSTLOCK(surface) ) {
SDL_UnlockSurface(surface);
}
return 0;
}

/*
* A function to calculate the intersection of two rectangles:
* return true if the rectangles intersect, false otherwise
*/
static __inline__
SDL_bool SDL_IntersectRect(const SDL_Rect *A, const SDL_Rect *B, SDL_Rect *intersection)
{
int Amin, Amax, Bmin, Bmax;

/* Horizontal intersection */
Amin = A->x;
Amax = Amin + A->w;
Bmin = B->x;
Bmax = Bmin + B->w;
if(Bmin > Amin)
Amin = Bmin;
intersection->x = Amin;
if(Bmax < Amax)
Amax = Bmax;
intersection->w = Amax - Amin > 0 ? Amax - Amin : 0;

/* Vertical intersection */
Amin = A->y;
Amax = Amin + A->h;
Bmin = B->y;
Bmax = Bmin + B->h;
if(Bmin > Amin)
Amin = Bmin;
intersection->y = Amin;
if(Bmax < Amax)
Amax = Bmax;
intersection->h = Amax - Amin > 0 ? Amax - Amin : 0;

return (intersection->w && intersection->h);
}
/*
* Set the clipping rectangle for a blittable surface
*/
SDL_bool SDL_SetClipRect(SDL_Surface *surface, const SDL_Rect *rect)
{
SDL_Rect full_rect;

/* Don't do anything if there's no surface to act on */
if ( ! surface ) {
return SDL_FALSE;
}

/* Set up the full surface rectangle */
full_rect.x = 0;
full_rect.y = 0;
full_rect.w = surface->w;
full_rect.h = surface->h;

/* Set the clipping rectangle */
if ( ! rect ) {
surface->clip_rect = full_rect;
return 1;
}
return SDL_IntersectRect(rect, &full_rect, &surface->clip_rect);
}
void SDL_GetClipRect(SDL_Surface *surface, SDL_Rect *rect)
{
if ( surface && rect ) {
*rect = surface->clip_rect;
}
}
/*
* Set up a blit between two surfaces -- split into three parts:
* The upper part, SDL_UpperBlit(), performs clipping and rectangle
* verification. The lower part is a pointer to a low level
* accelerated blitting function.
*
* These parts are separated out and each used internally by this
* library in the optimimum places. They are exported so that if
* you know exactly what you are doing, you can optimize your code
* by calling the one(s) you need.
*/
int SDL_LowerBlit (SDL_Surface *src, SDL_Rect *srcrect,
SDL_Surface *dst, SDL_Rect *dstrect)
{
SDL_blit do_blit;
SDL_Rect hw_srcrect;
SDL_Rect hw_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);
}
}

/* Figure out which blitter to use */
if ( (src->flags & SDL_HWACCEL) == SDL_HWACCEL ) {
if ( src == SDL_VideoSurface ) {
hw_srcrect = *srcrect;
hw_srcrect.x += current_video->offset_x;
hw_srcrect.y += current_video->offset_y;
srcrect = &hw_srcrect;
}
if ( dst == SDL_VideoSurface ) {
hw_dstrect = *dstrect;
hw_dstrect.x += current_video->offset_x;
hw_dstrect.y += current_video->offset_y;
dstrect = &hw_dstrect;
}
do_blit = src->map->hw_blit;
} else {
do_blit = src->map->sw_blit;
}
return(do_blit(src, srcrect, dst, dstrect));
}


int SDL_UpperBlit (SDL_Surface *src, 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;
}

static int SDL_FillRect1(SDL_Surface *dst, SDL_Rect *dstrect, Uint32 color)
{
/* FIXME: We have to worry about packing order.. *sigh* */
SDL_SetError("1-bpp rect fill not yet implemented");
return -1;
}

static int SDL_FillRect4(SDL_Surface *dst, SDL_Rect *dstrect, Uint32 color)
{
/* FIXME: We have to worry about packing order.. *sigh* */
SDL_SetError("4-bpp rect fill not yet implemented");
return -1;
}

/*
* This function performs a fast fill of the given rectangle with 'color'
*/
int SDL_FillRect(SDL_Surface *dst, SDL_Rect *dstrect, Uint32 color)
{
SDL_VideoDevice *video = current_video;
SDL_VideoDevice *this = current_video;
int x, y;
Uint8 *row;

/* This function doesn't work on surfaces < 8 bpp */
if ( dst->format->BitsPerPixel < 8 ) {
switch(dst->format->BitsPerPixel) {
case 1:
return SDL_FillRect1(dst, dstrect, color);
break;
case 4:
return SDL_FillRect4(dst, dstrect, color);
break;
default:
SDL_SetError("Fill rect on unsupported surface format");
return(-1);
break;
}
}

/* If 'dstrect' == NULL, then fill the whole surface */
if ( dstrect ) {
/* Perform clipping */
if ( !SDL_IntersectRect(dstrect, &dst->clip_rect, dstrect) ) {
return(0);
}
} else {
dstrect = &dst->clip_rect;
}

/* Check for hardware acceleration */
if ( ((dst->flags & SDL_HWSURFACE) == SDL_HWSURFACE) &&
video->info.blit_fill ) {
SDL_Rect hw_rect;
if ( dst == SDL_VideoSurface ) {
hw_rect = *dstrect;
hw_rect.x += current_video->offset_x;
hw_rect.y += current_video->offset_y;
dstrect = &hw_rect;
}
return(video->FillHWRect(this, dst, dstrect, color));
}

/* Perform software fill */
if ( SDL_LockSurface(dst) != 0 ) {
return(-1);
}
row = (Uint8 *)dst->pixels+dstrect->y*dst->pitch+
dstrect->x*dst->format->BytesPerPixel;
if ( dst->format->palette || (color == 0) ) {
x = dstrect->w*dst->format->BytesPerPixel;
if ( !color && !((uintptr_t)row&3) && !(x&3) && !(dst->pitch&3) ) {
int n = x >> 2;
for ( y=dstrect->h; y; --y ) {
SDL_memset4(row, 0, n);
row += dst->pitch;
}
} else {
#ifdef __powerpc__
/*
* SDL_memset() on PPC (both glibc and codewarrior) uses
* the dcbz (Data Cache Block Zero) instruction, which
* causes an alignment exception if the destination is
* uncachable, so only use it on software surfaces
*/
if((dst->flags & SDL_HWSURFACE) == SDL_HWSURFACE) {
if(dstrect->w >= 8) {
/*
* 64-bit stores are probably most
* efficient to uncached video memory
*/
double fill;
SDL_memset(&fill, color, (sizeof fill));
for(y = dstrect->h; y; y--) {
Uint8 *d = row;
unsigned n = x;
unsigned nn;
Uint8 c = color;
double f = fill;
while((unsigned long)d
& (sizeof(double) - 1)) {
*d++ = c;
n--;
}
nn = n / (sizeof(double) * 4);
while(nn) {
((double *)d)[0] = f;
((double *)d)[1] = f;
((double *)d)[2] = f;
((double *)d)[3] = f;
d += 4*sizeof(double);
nn--;
}
n &= ~(sizeof(double) * 4 - 1);
nn = n / sizeof(double);
while(nn) {
*(double *)d = f;
d += sizeof(double);
nn--;
}
n &= ~(sizeof(double) - 1);
while(n) {
*d++ = c;
n--;
}
row += dst->pitch;
}
} else {
/* narrow boxes */
for(y = dstrect->h; y; y--) {
Uint8 *d = row;
Uint8 c = color;
int n = x;
while(n) {
*d++ = c;
n--;
}
row += dst->pitch;
}
}
} else
#endif /* __powerpc__ */
{
for(y = dstrect->h; y; y--) {
SDL_memset(row, color, x);
row += dst->pitch;
}
}
}
} else {
switch (dst->format->BytesPerPixel) {
case 2:
for ( y=dstrect->h; y; --y ) {
Uint16 *pixels = (Uint16 *)row;
Uint16 c = (Uint16)color;
Uint32 cc = (Uint32)c << 16 | c;
int n = dstrect->w;
if((uintptr_t)pixels & 3) {
*pixels++ = c;
n--;
}
if(n >> 1)
SDL_memset4(pixels, cc, n >> 1);
if(n & 1)
pixels[n - 1] = c;
row += dst->pitch;
}
break;

case 3:
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
color <<= 8;
#endif
for ( y=dstrect->h; y; --y ) {
Uint8 *pixels = row;
for ( x=dstrect->w; x; --x ) {
SDL_memcpy(pixels, &color, 3);
pixels += 3;
}
row += dst->pitch;
}
break;

case 4:
for(y = dstrect->h; y; --y) {
SDL_memset4(row, color, dstrect->w);
row += dst->pitch;
}
break;
}
}
SDL_UnlockSurface(dst);

/* We're done! */
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_HWSURFACE|SDL_ASYNCBLIT) ) {
SDL_VideoDevice *video = current_video;
SDL_VideoDevice *this = current_video;
if ( video->LockHWSurface(this, surface) < 0 ) {
return(-1);
}
}
if ( surface->flags & SDL_RLEACCEL ) {
SDL_UnRLESurface(surface, 1);
surface->flags |= SDL_RLEACCEL; /* save accel'd state */
}
/* This needs to be done here in case pixels changes value */
surface->pixels = (Uint8 *)surface->pixels + surface->offset;
}

/* 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;
}

/* Perform the unlock */
surface->pixels = (Uint8 *)surface->pixels - surface->offset;

/* Unlock hardware or accelerated surfaces */
if ( surface->flags & (SDL_HWSURFACE|SDL_ASYNCBLIT) ) {
SDL_VideoDevice *video = current_video;
SDL_VideoDevice *this = current_video;
video->UnlockHWSurface(this, surface);
} else {
/* 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 colorkey = 0;
Uint8 alpha = 0;
Uint32 surface_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 != 0) ||
(format->palette->colors[i].g != 0) ||
(format->palette->colors[i].b != 0) )
break;
}
if ( i == format->palette->ncolors ) {
SDL_SetError("Empty destination palette");
return(NULL);
}
}

/* Only create hw surfaces with alpha channel if hw alpha blits
are supported */
if(format->Amask != 0 && (flags & SDL_HWSURFACE)) {
const SDL_VideoInfo *vi = SDL_GetVideoInfo();
if(!vi || !vi->blit_hw_A)
flags &= ~SDL_HWSURFACE;
}

/* 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 surface color key and alpha */
surface_flags = surface->flags;
if ( (surface_flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY ) {
/* Convert colourkeyed surfaces to RGBA if requested */
if((flags & SDL_SRCCOLORKEY) != SDL_SRCCOLORKEY
&& format->Amask) {
surface_flags &= ~SDL_SRCCOLORKEY;
} else {
colorkey = surface->format->colorkey;
SDL_SetColorKey(surface, 0, 0);
}
}
if ( (surface_flags & SDL_SRCALPHA) == SDL_SRCALPHA ) {
/* Copy over the alpha channel to RGBA if requested */
if ( format->Amask ) {
surface->flags &= ~SDL_SRCALPHA;
} else {
alpha = surface->format->alpha;
SDL_SetAlpha(surface, 0, 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 */
if ( convert != NULL ) {
SDL_SetClipRect(convert, &surface->clip_rect);
}
if ( (surface_flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY ) {
Uint32 cflags = surface_flags&(SDL_SRCCOLORKEY|SDL_RLEACCELOK);
if ( convert != NULL ) {
Uint8 keyR, keyG, keyB;

SDL_GetRGB(colorkey,surface->format,&keyR,&keyG,&keyB);
SDL_SetColorKey(convert, cflags|(flags&SDL_RLEACCELOK),
SDL_MapRGB(convert->format, keyR, keyG, keyB));
}
SDL_SetColorKey(surface, cflags, colorkey);
}
if ( (surface_flags & SDL_SRCALPHA) == SDL_SRCALPHA ) {
Uint32 aflags = surface_flags&(SDL_SRCALPHA|SDL_RLEACCELOK);
if ( convert != NULL ) {
SDL_SetAlpha(convert, aflags|(flags&SDL_RLEACCELOK),
alpha);
}
if ( format->Amask ) {
surface->flags |= SDL_SRCALPHA;
} else {
SDL_SetAlpha(surface, aflags, alpha);
}
}

/* We're ready to go! */
return(convert);
}

/*
* Free a surface created by the above function.
*/
void SDL_FreeSurface (SDL_Surface *surface)
{
/* Free anything that's not NULL, and not the screen surface */
if ((surface == NULL) ||
(current_video &&
((surface == SDL_ShadowSurface)||(surface == SDL_VideoSurface)))) {
return;
}
if ( --surface->refcount > 0 ) {
return;
}
while ( surface->locked > 0 ) {
SDL_UnlockSurface(surface);
}
if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) {
SDL_UnRLESurface(surface, 0);
}
if ( surface->format ) {
SDL_FreeFormat(surface->format);
surface->format = NULL;
}
if ( surface->map != NULL ) {
SDL_FreeBlitMap(surface->map);
surface->map = NULL;
}
if ( surface->hwdata ) {
SDL_VideoDevice *video = current_video;
SDL_VideoDevice *this = current_video;
video->FreeHWSurface(this, surface);
}
if ( surface->pixels &&
((surface->flags & SDL_PREALLOC) != SDL_PREALLOC) ) {
SDL_free(surface->pixels);
}
SDL_free(surface);
#ifdef CHECK_LEAKS
--surfaces_allocated;
#endif
}
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