Mercurial > sdl-ios-xcode
view docs/man3/SDL_Surface.3 @ 3335:b8d313de8a65
Adam Strzelecki to SDL
Since current DirectFB implementation is incomplete for YUV surfaces (actually causes segmentation faults when trying Lock and use YUV planar textures) I decided to fix it a bit.
Here's a patch that should make DirectFB properly support YUV both packed and planar (3 planes).
(1) Removed SDL_BYTESPERPIXEL at all in favor of DFB_BYTES_PER_PIXEL(SDLToDFBPixelFormat(fmt)) which does return always proper BPP for YUVs too, coz SDL_BYTESPERPIXEL returns incorrect values for FOURCCs
(2) Fixed data->pixels allocation for planar YUVs in CreateTexture, it should allocate 150% more space
(3) Copy other planes for planar YUVs in UpdateTexture
(4) Moved checking if format is supported at all with DirectFB on CreateTexture at the beginning of the code
Waiting for comments,
--
Adam Strzelecki | nanoant.com
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 04 Oct 2009 04:03:37 +0000 |
| parents | 546f7c1eb755 |
| children | 1238da4a7112 |
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.TH "SDL_Surface" "3" "Tue 11 Sep 2001, 23:01" "SDL" "SDL API Reference" .SH "NAME" SDL_Surface \- Graphical Surface Structure .SH "STRUCTURE DEFINITION" .PP .nf \f(CWtypedef struct SDL_Surface { Uint32 flags; /* Read-only */ SDL_PixelFormat *format; /* Read-only */ int w, h; /* Read-only */ Uint16 pitch; /* Read-only */ void *pixels; /* Read-write */ /* clipping information */ SDL_Rect clip_rect; /* Read-only */ /* Reference count -- used when freeing surface */ int refcount; /* Read-mostly */ /* This structure also contains private fields not shown here */ } SDL_Surface;\fR .fi .PP .SH "STRUCTURE DATA" .TP 20 \fBflags\fR Surface flags .TP 20 \fBformat\fR Pixel \fIformat\fR .TP 20 \fBw, h\fR Width and height of the surface .TP 20 \fBpitch\fR Length of a surface scanline in bytes .TP 20 \fBpixels\fR Pointer to the actual pixel data .TP 20 \fBclip_rect\fR surface clip \fIrectangle\fR .SH "DESCRIPTION" .PP \fBSDL_Surface\fR\&'s represent areas of "graphical" memory, memory that can be drawn to\&. The video framebuffer is returned as a \fBSDL_Surface\fR by \fI\fBSDL_SetVideoMode\fP\fR and \fI\fBSDL_GetVideoSurface\fP\fR\&. Most of the fields should be pretty obvious\&. \fBw\fR and \fBh\fR are the width and height of the surface in pixels\&. \fBpixels\fR is a pointer to the actual pixel data, the surface should be \fIlocked\fR before accessing this field\&. The \fBclip_rect\fR field is the clipping rectangle as set by \fI\fBSDL_SetClipRect\fP\fR\&. .PP The following are supported in the \fBflags\fR field\&. .TP 20 \fBSDL_SWSURFACE\fP Surface is stored in system memory .TP 20 \fBSDL_HWSURFACE\fP Surface is stored in video memory .TP 20 \fBSDL_ASYNCBLIT\fP Surface uses asynchronous blits if possible .TP 20 \fBSDL_ANYFORMAT\fP Allows any pixel-format (Display surface) .TP 20 \fBSDL_HWPALETTE\fP Surface has exclusive palette .TP 20 \fBSDL_DOUBLEBUF\fP Surface is double buffered (Display surface) .TP 20 \fBSDL_FULLSCREEN\fP Surface is full screen (Display Surface) .TP 20 \fBSDL_OPENGL\fP Surface has an OpenGL context (Display Surface) .TP 20 \fBSDL_OPENGLBLIT\fP Surface supports OpenGL blitting (Display Surface) .TP 20 \fBSDL_RESIZABLE\fP Surface is resizable (Display Surface) .TP 20 \fBSDL_HWACCEL\fP Surface blit uses hardware acceleration .TP 20 \fBSDL_SRCCOLORKEY\fP Surface use colorkey blitting .TP 20 \fBSDL_RLEACCEL\fP Colorkey blitting is accelerated with RLE .TP 20 \fBSDL_SRCALPHA\fP Surface blit uses alpha blending .TP 20 \fBSDL_PREALLOC\fP Surface uses preallocated memory .SH "SEE ALSO" .PP \fI\fBSDL_PixelFormat\fR\fR ...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:01