pandory500/SDL-mirror
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Added SDL_LockRect() and SDL_UnlockRect()

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Incorporated XFree86 extension libraries into the source

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%40293
This commit is contained in:
Sam Lantinga 2002-03-05 19:55:32 +00:00
parent 84075e735c
commit a1db24829f
49 changed files with 8397 additions and 201 deletions
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102
src/video/SDL_surface.c
View file

@ -630,6 +630,10 @@ int SDL_FillRect(SDL_Surface *dst, SDL_Rect *dstrect, Uint32 color)
*/
int SDL_LockSurface (SDL_Surface *surface)
{
if ( surface->locked < 0 ) {
SDL_SetError("Surface has a rectangle lock");
return(-1);
}
if ( ! surface->locked ) {
/* Perform the lock */
if ( surface->flags & (SDL_HWSURFACE|SDL_ASYNCBLIT) ) {
@ -653,6 +657,78 @@ int SDL_LockSurface (SDL_Surface *surface)
/* Ready to go.. */
return(0);
}
int SDL_LockRect (SDL_Surface *surface, SDL_Rect *rect, void **pixels, int *pitch)
{
int retval = 0;
/* Check to see if the surface is already locked */
*pixels = NULL;
if ( surface->locked != 0 ) {
SDL_SetError("Surface is already locked");
return(-1);
}
/* Clip the lock to the clipping rectangle of the surface */
{
SDL_Rect *clip = &surface->clip_rect;
int dx, dy;
int h = rect->h;
int w = rect->w;
dx = clip->x - rect->x;
if(dx > 0) {
w -= dx;
rect->x += dx;
}
dx = rect->x + w - clip->x - clip->w;
if(dx > 0)
w -= dx;
dy = clip->y - rect->y;
if(dy > 0) {
h -= dy;
rect->y += dy;
}
dy = rect->y + h - clip->y - clip->h;
if(dy > 0)
h -= dy;
if(w > 0 && h > 0) {
rect->w = w;
rect->h = h;
} else {
rect->w = 0;
rect->h = 0;
SDL_SetError("Rectangle was clipped");
return(-1);
}
}
/* Perform the lock */
if ( surface->flags & (SDL_HWSURFACE|SDL_ASYNCBLIT) ) {
SDL_VideoDevice *video = current_video;
SDL_VideoDevice *this = current_video;
if ( video->LockHWSurfaceRect ) {
retval = video->LockHWSurfaceRect(this, surface, rect, pixels, pitch);
if ( retval == 0 ) {
surface->locked = -1;
return 0;
}
}
}
if ( SDL_MUSTLOCK(surface) ) {
retval = SDL_LockSurface(surface);
if ( retval < 0 ) {
return retval;
}
}
surface->locked = -1;
*pixels = (Uint8 *)surface->pixels + rect->y * surface->pitch + rect->x * surface->format->BytesPerPixel;
*pitch = surface->pitch;
/* Ready to go.. */
return(0);
}
/*
* Unlock a previously locked surface
* -- Do not call this from any blit function, as SDL_DrawCursor() may recurse
@ -663,6 +739,9 @@ int SDL_LockSurface (SDL_Surface *surface)
void SDL_UnlockSurface (SDL_Surface *surface)
{
/* Only perform an unlock if we are locked */
if ( surface->locked < 0 ) {
return;
}
if ( ! surface->locked || (--surface->locked > 0) ) {
return;
}
@ -683,6 +762,29 @@ void SDL_UnlockSurface (SDL_Surface *surface)
}
}
}
void SDL_UnlockRect (SDL_Surface *surface)
{
/* Only perform an unlock if we are locked */
if ( surface->locked != -1 ) {
return;
}
/* Perform the unlock */
if ( surface->flags & (SDL_HWSURFACE|SDL_ASYNCBLIT) ) {
SDL_VideoDevice *video = current_video;
SDL_VideoDevice *this = current_video;
if ( video->LockHWSurfaceRect ) {
video->UnlockHWSurfaceRect(this, surface);
return;
}
}
if ( SDL_MUSTLOCK(surface) ) {
surface->locked = 1;
SDL_UnlockSurface(surface);
} else {
surface->locked = 0;
}
}
/*
* Convert a surface into the specified pixel format.