Mercurial > sdl-ios-xcode
annotate docs/man3/SDL_SetPalette.3 @ 914:bbf8dcc8aed6
Date: Wed, 23 Jun 2004 17:05:33 -0400
From: Chris Nelson
Subject: [SDL] [Patch] WiseGroup MP-8800 / MP-8866 (PS2 Joystick)
In the current cvs version, SDL doesn't handle these Playstation2
controller => USB adapters correctly, in linux.
It will always assume that the maximum number of joysticks (2 in the
case of the MP-8866, 4 in the case of the 8800) are plugged in. This is
bad not only because it allows SDL to exaggerate the number of logical
joysticks, but primarily because the joystick axes are mapped
incorrectly, all over the place, such that the devices are effectively
unusable unless you have the maximum number of joysticks plugged in.
My changes to src/joystick/linux/SDL_sysjoystick.c build on another's
previous work (which was a special case for this very joystick,
actually), and fix both of these problems, as well as making the current
code a little more general, to allow for others to more easily drop in
code for quirky joysticks such as these.
I've tested this code under 2.6.7 as well as 2.4.24... Both work as
advertised (provided you load the JOYDEV linux code as a module,
otherwise they won't work at all, new code or old, but that's another
issue entirely).
Though this sounds horribly formal, you have my permission to distribute
all of my work on this issue under the LGPL. So there.
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sun, 25 Jul 2004 18:31:50 +0000 |
parents | e5bc29de3f0a |
children | 546f7c1eb755 |
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" |
3 SDL_SetPalette\- Sets the colors in the palette of an 8-bit surface\&. | |
4 .SH "SYNOPSIS" | |
5 .PP | |
6 \fB#include "SDL\&.h" | |
7 .sp | |
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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 | |
181
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parents:
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59 ...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:01 |