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sdl_updaterects(3) [centos man page]

SDL_UpdateRects(3)						 SDL API Reference						SDL_UpdateRects(3)

SDL_UpdateRects - Makes sure the given list of rectangles is updated on the given screen. SYNOPSIS
#include "SDL.h" void SDL_UpdateRects(SDL_Surface *screen, int numrects, SDL_Rect *rects); DESCRIPTION
Makes sure the given list of rectangles is updated on the given screen. The rectangles must all be confined within the screen boundaries (no clipping is done). This function should not be called while screen is locked. Note: It is adviced to call this function only once per frame, since each call has some processing overhead. This is no restriction since you can pass any number of rectangles each time. The rectangles are not automatically merged or checked for overlap. In general, the programmer can use his knowledge about his par- ticular rectangles to merge them in an efficient way, to avoid overdraw. SEE ALSO
SDL_UpdateRect, SDL_Rect, SDL_Surface, SDL_LockSurface SDL
Tue 11 Sep 2001, 23:01 SDL_UpdateRects(3)

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SDL_SetVideoMode(3)						 SDL API Reference					       SDL_SetVideoMode(3)

SDL_SetVideoMode- Set up a video mode with the specified width, height and bits-per-pixel. SYNOPSIS
#include "SDL.h" SDL_Surface *SDL_SetVideoMode(int width, int height, int bpp, Uint32 flags); DESCRIPTION
Set up a video mode with the specified width, height and bits-per-pixel. If bpp is 0, it is treated as the current display bits per pixel. The flags parameter is the same as the flags field of the SDL_Surface structure. OR'd combinations of the following values are valid. SDL_SWSURFACE Create the video surface in system memory SDL_HWSURFACE Create the video surface in video memory SDL_ASYNCBLIT Enables the use of asynchronous updates of the display surface. This will usually slow down blitting on single CPU machines, but may provide a speed increase on SMP systems. SDL_ANYFORMAT Normally, if a video surface of the requested bits-per-pixel (bpp) is not available, SDL will emulate one with a shadow surface. Passing SDL_ANYFORMAT prevents this and causes SDL to use the video surface, regardless of its pixel depth. SDL_HWPALETTE Give SDL exclusive palette access. Without this flag you may not always get the the colors you request with SDL_SetCol- ors or SDL_SetPalette. SDL_DOUBLEBUF Enable hardware double buffering; only valid with SDL_HWSURFACE. Calling SDL_Flip will flip the buffers and update the screen. All drawing will take place on the surface that is not displayed at the moment. If double buffering could not be enabled then SDL_Flip will just perform a SDL_UpdateRect on the entire screen. SDL_FULLSCREEN SDL will attempt to use a fullscreen mode. If a hardware resolution change is not possible (for whatever reason), the next higher resolution will be used and the display window centered on a black background. SDL_OPENGL Create an OpenGL rendering context. You should have previously set OpenGL video attributes with SDL_GL_SetAttribute. SDL_OPENGLBLIT Create an OpenGL rendering context, like above, but allow normal blitting operations. The screen (2D) surface may have an alpha channel, and SDL_UpdateRects must be used for updating changes to the screen surface. SDL_RESIZABLE Create a resizable window. When the window is resized by the user a SDL_VIDEORESIZE event is generated and SDL_SetVideoMode can be called again with the new size. SDL_NOFRAME If possible, SDL_NOFRAME causes SDL to create a window with no title bar or frame decoration. Fullscreen modes automat- ically have this flag set. Note: Whatever flags SDL_SetVideoMode could satisfy are set in the flags member of the returned surface. Note: The bpp parameter is the number of bits per pixel, so a bpp of 24 uses the packed representation of 3 bytes/pixel. For the more com- mon 4 bytes/pixel mode, use a bpp of 32. Somewhat oddly, both 15 and 16 will request a 2 bytes/pixel mode, but different pixel for- mats. RETURN VALUE
The framebuffer surface, or NULL if it fails. The surface returned is freed by SDL_Quit() and should nt be freed by the caller. SEE ALSO
SDL_LockSurface, SDL_SetColors, SDL_Flip, SDL_Surface SDL
Tue 11 Sep 2001, 23:01 SDL_SetVideoMode(3)
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