Mercurial > sdl-ios-xcode
annotate docs/man3/SDL_SetPalette.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 |
|---|---|
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1 .TH "SDL_SetPalette" "3" "Tue 11 Sep 2001, 23:01" "SDL" "SDL API Reference" |
| 0 | 2 .SH "NAME" |
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546f7c1eb755
Merged revision 3472 from SDL 1.2, fixing bug #493
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3 SDL_SetPalette \- Sets the colors in the palette of an 8-bit surface\&. |
| 0 | 4 .SH "SYNOPSIS" |
| 5 .PP | |
| 6 \fB#include "SDL\&.h" | |
| 7 .sp | |
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Added new docs for SDL 1.2.1
Sam Lantinga <slouken@lokigames.com>
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8 \fBint \fBSDL_SetPalette\fP\fR(\fBSDL_Surface *surface, int flags, SDL_Color *colors, int firstcolor, int ncolors\fR); |
| 0 | 9 .SH "DESCRIPTION" |
| 10 .PP | |
| 11 Sets a portion of the palette for the given 8-bit surface\&. | |
| 12 .PP | |
| 13 Palettized (8-bit) screen surfaces with the \fBSDL_HWPALETTE\fP flag have two palettes, a logical palette that is used for mapping blits to/from the surface and a physical palette (that determines how the hardware will map the colors to the display)\&. \fISDL_BlitSurface\fR always uses the logical palette when blitting surfaces (if it has to convert between surface pixel formats)\&. Because of this, it is often useful to modify only one or the other palette to achieve various special color effects (e\&.g\&., screen fading, color flashes, screen dimming)\&. | |
| 14 .PP | |
| 15 This function can modify either the logical or physical palette by specifing \fBSDL_LOGPAL\fP or \fBSDL_PHYSPAL\fPthe in the \fBflags\fR parameter\&. | |
| 16 .PP | |
| 17 When \fBsurface\fR is the surface associated with the current display, the display colormap will be updated with the requested colors\&. If \fBSDL_HWPALETTE\fP was set in \fISDL_SetVideoMode\fR flags, \fBSDL_SetPalette\fP will always return \fB1\fR, and the palette is guaranteed to be set the way you desire, even if the window colormap has to be warped or run under emulation\&. | |
| 18 .PP | |
| 19 The color components of a \fI\fBSDL_Color\fR\fR structure are 8-bits in size, giving you a total of 256^3=16777216 colors\&. | |
| 20 .SH "RETURN VALUE" | |
| 21 .PP | |
| 22 If \fBsurface\fR is not a palettized surface, this function does nothing, returning \fB0\fR\&. If all of the colors were set as passed to \fBSDL_SetPalette\fP, it will return \fB1\fR\&. If not all the color entries were set exactly as given, it will return \fB0\fR, and you should look at the surface palette to determine the actual color palette\&. | |
| 23 .SH "EXAMPLE" | |
| 24 .PP | |
| 25 .nf | |
| 26 \f(CW /* Create a display surface with a grayscale palette */ | |
| 27 SDL_Surface *screen; | |
| 28 SDL_Color colors[256]; | |
| 29 int i; | |
| 30 \&. | |
| 31 \&. | |
| 32 \&. | |
| 33 /* Fill colors with color information */ | |
| 34 for(i=0;i<256;i++){ | |
| 35 colors[i]\&.r=i; | |
| 36 colors[i]\&.g=i; | |
| 37 colors[i]\&.b=i; | |
| 38 } | |
| 39 | |
| 40 /* Create display */ | |
| 41 screen=SDL_SetVideoMode(640, 480, 8, SDL_HWPALETTE); | |
| 42 if(!screen){ | |
| 43 printf("Couldn\&'t set video mode: %s | |
| 44 ", SDL_GetError()); | |
| 45 exit(-1); | |
| 46 } | |
| 47 | |
| 48 /* Set palette */ | |
| 49 SDL_SetPalette(screen, SDL_LOGPAL|SDL_PHYSPAL, colors, 0, 256); | |
| 50 \&. | |
| 51 \&. | |
| 52 \&. | |
| 53 \&.\fR | |
| 54 .fi | |
| 55 .PP | |
| 56 .SH "SEE ALSO" | |
| 57 .PP | |
| 58 \fISDL_SetColors\fR, \fISDL_SetVideoMode\fR, \fISDL_Surface\fR, \fISDL_Color\fR | |
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Updated from the SDL Documentation Project
Sam Lantinga <slouken@libsdl.org>
parents:
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59 ...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:01 |