/*
* Free a surface created by the above function.
*/
void
SDL_FreeSurface(SDL_Surface * surface)
{
if (surface == NULL) {
return;
}
if (surface->flags & SDL_DONTFREE) {
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);
}
/* 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);
}
/*
* 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);
}
/*
* Lock a surface to directly access the pixels
*/
int
SDL_LockSurface(SDL_Surface * surface)
{
if (!surface->locked) {
/* Perform the lock */
if (surface->flags & SDL_RLEACCEL) {
SDL_UnRLESurface(surface, 1);
surface->flags |= SDL_RLEACCEL; /* save accel'd state */
}
}
/* Increment the surface lock count, for recursive locks */
++surface->locked;
/* Ready to go.. */
return (0);
}
/* Figure out which of many blit routines to set up on a surface */
int SDL_CalculateBlit(SDL_Surface *surface)
{
int blit_index;
/* Clean everything out to start */
if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) {
SDL_UnRLESurface(surface, 1);
}
surface->map->sw_blit = NULL;
/* Figure out if an accelerated hardware blit is possible */
surface->flags &= ~SDL_HWACCEL;
//__android_log_print(ANDROID_LOG_INFO, "libSDL", "SDL_CalculateBlit(): identity %d src hw %d dst hw %d video hw %d", (int)surface->map->identity, (int)(surface->flags & SDL_HWSURFACE), (int)(surface->map->dst->flags & SDL_HWSURFACE), (int)(current_video->info.blit_hw));
if ( surface->map->identity ) {
int hw_blit_ok;
if ( (surface->flags & SDL_HWSURFACE) == SDL_HWSURFACE ) {
/* We only support accelerated blitting to hardware */
if ( surface->map->dst->flags & SDL_HWSURFACE ) {
hw_blit_ok = current_video->info.blit_hw;
} else {
hw_blit_ok = 0;
}
if (hw_blit_ok && (surface->flags & SDL_SRCCOLORKEY)) {
hw_blit_ok = current_video->info.blit_hw_CC;
}
if ( hw_blit_ok && (surface->flags & SDL_SRCALPHA) ) {
hw_blit_ok = current_video->info.blit_hw_A;
}
} else {
/* We only support accelerated blitting to hardware */
if ( surface->map->dst->flags & SDL_HWSURFACE ) {
hw_blit_ok = current_video->info.blit_sw;
} else {
hw_blit_ok = 0;
}
if (hw_blit_ok && (surface->flags & SDL_SRCCOLORKEY)) {
hw_blit_ok = current_video->info.blit_sw_CC;
}
if ( hw_blit_ok && (surface->flags & SDL_SRCALPHA) ) {
hw_blit_ok = current_video->info.blit_sw_A;
}
}
if ( hw_blit_ok ) {
SDL_VideoDevice *video = current_video;
SDL_VideoDevice *this = current_video;
video->CheckHWBlit(this, surface, surface->map->dst);
}
}
/* if an alpha pixel format is specified, we can accelerate alpha blits */
if (((surface->flags & SDL_HWSURFACE) == SDL_HWSURFACE )&&(current_video->displayformatalphapixel))
{
if ( (surface->flags & SDL_SRCALPHA) )
if ( current_video->info.blit_hw_A ) {
SDL_VideoDevice *video = current_video;
SDL_VideoDevice *this = current_video;
video->CheckHWBlit(this, surface, surface->map->dst);
}
}
/* Get the blit function index, based on surface mode */
/* { 0 = nothing, 1 = colorkey, 2 = alpha, 3 = colorkey+alpha } */
blit_index = 0;
blit_index |= (!!(surface->flags & SDL_SRCCOLORKEY)) << 0;
if ( surface->flags & SDL_SRCALPHA
&& (surface->format->alpha != SDL_ALPHA_OPAQUE
|| surface->format->Amask) ) {
blit_index |= 2;
}
/* Check for special "identity" case -- copy blit */
if ( surface->map->identity && blit_index == 0 ) {
surface->map->sw_data->blit = SDL_BlitCopy;
/* Handle overlapping blits on the same surface */
if ( surface == surface->map->dst ) {
surface->map->sw_data->blit = SDL_BlitCopyOverlap;
}
} else {
if ( surface->format->BitsPerPixel < 8 ) {
surface->map->sw_data->blit =
SDL_CalculateBlit0(surface, blit_index);
} else {
switch ( surface->format->BytesPerPixel ) {
case 1:
surface->map->sw_data->blit =
SDL_CalculateBlit1(surface, blit_index);
break;
case 2:
case 3:
case 4:
surface->map->sw_data->blit =
SDL_CalculateBlitN(surface, blit_index);
break;
default:
surface->map->sw_data->blit = NULL;
break;
}
}
}
/* Make sure we have a blit function */
if ( surface->map->sw_data->blit == NULL ) {
SDL_InvalidateMap(surface->map);
SDL_SetError("Blit combination not supported");
return(-1);
}
/* Choose software blitting function */
if(surface->flags & SDL_RLEACCELOK
&& (surface->flags & SDL_HWACCEL) != SDL_HWACCEL) {
if(surface->map->identity
&& (blit_index == 1
|| (blit_index == 3 && !surface->format->Amask))) {
if ( SDL_RLESurface(surface) == 0 )
surface->map->sw_blit = SDL_RLEBlit;
} else if(blit_index == 2 && surface->format->Amask) {
if ( SDL_RLESurface(surface) == 0 )
surface->map->sw_blit = SDL_RLEAlphaBlit;
}
}
if ( surface->map->sw_blit == NULL ) {
surface->map->sw_blit = SDL_SoftBlit;
}
return(0);
}
/* The general purpose software blit routine */
static int SDL_SoftBlit(SDL_Surface *src, SDL_Rect *srcrect,
SDL_Surface *dst, SDL_Rect *dstrect)
{
int okay;
int src_locked;
int dst_locked;
/* Everything is okay at the beginning... */
okay = 1;
/* Lock the destination if it's in hardware */
dst_locked = 0;
if ( dst->flags & (SDL_HWSURFACE|SDL_ASYNCBLIT) ) {
SDL_VideoDevice *video = current_video;
SDL_VideoDevice *this = current_video;
if ( video->LockHWSurface(this, dst) < 0 ) {
okay = 0;
} else {
dst_locked = 1;
}
}
/* Lock the source if it's in hardware */
src_locked = 0;
if ( src->flags & (SDL_HWSURFACE|SDL_ASYNCBLIT) ) {
SDL_VideoDevice *video = current_video;
SDL_VideoDevice *this = current_video;
if ( video->LockHWSurface(this, src) < 0 ) {
okay = 0;
} else {
src_locked = 1;
}
}
/* Unencode the destination if it's RLE encoded */
if ( dst->flags & SDL_RLEACCEL ) {
SDL_UnRLESurface(dst, 1);
dst->flags |= SDL_RLEACCEL; /* save accel'd state */
}
/* Set up source and destination buffer pointers, and BLIT! */
if ( okay && srcrect->w && srcrect->h ) {
SDL_BlitInfo info;
SDL_loblit RunBlit;
/* Set up the blit information */
info.s_pixels = (Uint8 *)src->pixels + src->offset +
(Uint16)srcrect->y*src->pitch +
(Uint16)srcrect->x*src->format->BytesPerPixel;
info.s_width = srcrect->w;
info.s_height = srcrect->h;
info.s_skip=src->pitch-info.s_width*src->format->BytesPerPixel;
info.d_pixels = (Uint8 *)dst->pixels + dst->offset +
(Uint16)dstrect->y*dst->pitch +
(Uint16)dstrect->x*dst->format->BytesPerPixel;
info.d_width = dstrect->w;
info.d_height = dstrect->h;
info.d_skip=dst->pitch-info.d_width*dst->format->BytesPerPixel;
info.aux_data = src->map->sw_data->aux_data;
info.src = src->format;
info.table = src->map->table;
info.dst = dst->format;
RunBlit = src->map->sw_data->blit;
/* Run the actual software blit */
RunBlit(&info);
}
/* Re-encode the destination if it's RLE encoded */
if ( dst->flags & SDL_RLEACCEL ) {
dst->flags &= ~SDL_RLEACCEL; /* stop lying */
SDL_RLESurface(dst);
}
/* We need to unlock the surfaces if they're locked */
if ( dst_locked ) {
SDL_VideoDevice *video = current_video;
SDL_VideoDevice *this = current_video;
video->UnlockHWSurface(this, dst);
} else
if ( src_locked ) {
SDL_VideoDevice *video = current_video;
SDL_VideoDevice *this = current_video;
video->UnlockHWSurface(this, src);
}
/* Blit is done! */
return(okay ? 0 : -1);
}
