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Added SDL_LockRect() and SDL_UnlockRect()

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Incorporated XFree86 extension libraries into the source
This commit is contained in:
Sam Lantinga
2002-03-05 19:55:32 +00:00
parent 3ff890d752
commit 393bef31ab
49 changed files with 8397 additions and 201 deletions
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20
include/SDL_video.h
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@@ -531,6 +531,26 @@ extern DECLSPEC void SDL_FreeSurface(SDL_Surface *surface);
extern DECLSPEC int SDL_LockSurface(SDL_Surface *surface);
extern DECLSPEC void SDL_UnlockSurface(SDL_Surface *surface);
/*
* SDL_LockRect() locks a portion of the surface designated by the 'rect'
* parameter, and saves the resulting pixels and pitch in the arguments.
* The rect will be clipped if it extends beyond the bounds of the surface
*
* This may be more efficient than a full lock if you are using a hardware
* surface and plan to make a few changes to small areas in the surface.
*
* While a rectangle is locked, no other lock or blit call may be called
* on the surface. No operating system or library calls should be made
* between lock/unlock pairs, as critical system locks may be held during
* this time.
*
* After the surface is unlocked, the pixels pointer is no longer valid.
*
* SDL_LockRect() returns 0, or -1 if the surface couldn't be locked.
*/
extern DECLSPEC int SDL_LockRect(SDL_Surface *surface, SDL_Rect *rect, void **pixels, int *pitch);
extern DECLSPEC void SDL_UnlockRect(SDL_Surface *surface);
/*
* Load a surface from a seekable SDL data source (memory or file.)
* If 'freesrc' is non-zero, the source will be closed after being read.