Mercurial > sdl-ios-xcode
annotate docs/man3/SDL_VideoModeOK.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 |
rev | line source |
---|---|
181
e5bc29de3f0a
Updated from the SDL Documentation Project
Sam Lantinga <slouken@libsdl.org>
parents:
55
diff
changeset
|
1 .TH "SDL_VideoModeOK" "3" "Tue 11 Sep 2001, 23:01" "SDL" "SDL API Reference" |
0 | 2 .SH "NAME" |
2283
546f7c1eb755
Merged revision 3472 from SDL 1.2, fixing bug #493
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
|
3 SDL_VideoModeOK \- Check to see if a particular video mode is supported\&. |
0 | 4 .SH "SYNOPSIS" |
5 .PP | |
6 \fB#include "SDL\&.h" | |
7 .sp | |
8 \fBint \fBSDL_VideoModeOK\fP\fR(\fBint width, int height, int bpp, Uint32 flags\fR); | |
9 .SH "DESCRIPTION" | |
10 .PP | |
11 \fBSDL_VideoModeOK\fP returns \fB0\fR if the requested mode is not supported under any bit depth, or returns the bits-per-pixel of the closest available mode with the given width, height and requested \fIsurface\fR flags (see \fI\fBSDL_SetVideoMode\fP\fR)\&. | |
12 .PP | |
13 The bits-per-pixel value returned is only a suggested mode\&. You can usually request and bpp you want when \fIsetting\fR the video mode and SDL will emulate that color depth with a shadow video surface\&. | |
14 .PP | |
15 The arguments to \fBSDL_VideoModeOK\fP are the same ones you would pass to \fISDL_SetVideoMode\fR | |
16 .SH "EXAMPLE" | |
17 .PP | |
18 .nf | |
19 \f(CWSDL_Surface *screen; | |
20 Uint32 bpp; | |
21 \&. | |
22 \&. | |
23 \&. | |
24 printf("Checking mode 640x480@16bpp\&. | |
25 "); | |
26 bpp=SDL_VideoModeOK(640, 480, 16, SDL_HWSURFACE); | |
27 | |
28 if(!bpp){ | |
29 printf("Mode not available\&. | |
30 "); | |
31 exit(-1); | |
32 } | |
33 | |
34 printf("SDL Recommends 640x480@%dbpp\&. | |
35 ", bpp); | |
36 screen=SDL_SetVideoMode(640, 480, bpp, SDL_HWSURFACE); | |
37 \&. | |
38 \&.\fR | |
39 .fi | |
40 .PP | |
41 .SH "SEE ALSO" | |
42 .PP | |
43 \fI\fBSDL_SetVideoMode\fP\fR, \fI\fBSDL_GetVideoInfo\fP\fR | |
181
e5bc29de3f0a
Updated from the SDL Documentation Project
Sam Lantinga <slouken@libsdl.org>
parents:
55
diff
changeset
|
44 ...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:01 |