SDL for win64, I bet it's broken but better a broken SDL than no SDL

[xonotic/xonotic.git] / misc / builddeps / dp.win64 / share / man / man3 / SDL_SetPalette.3

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+.TH "SDL_SetPalette" "3" "Tue 11 Sep 2001, 23:01" "SDL" "SDL API Reference" 
+.SH "NAME"
+SDL_SetPalette \- Sets the colors in the palette of an 8-bit surface\&.
+.SH "SYNOPSIS"
+.PP
+\fB#include "SDL\&.h"
+.sp
+\fBint \fBSDL_SetPalette\fP\fR(\fBSDL_Surface *surface, int flags, SDL_Color *colors, int firstcolor, int ncolors\fR);
+.SH "DESCRIPTION"
+.PP
+Sets a portion of the palette for the given 8-bit surface\&.
+.PP
+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)\&.
+.PP
+This function can modify either the logical or physical palette by specifing \fBSDL_LOGPAL\fP or \fBSDL_PHYSPAL\fPthe in the \fBflags\fR parameter\&.
+.PP
+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\&.
+.PP
+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\&.
+.SH "RETURN VALUE"
+.PP
+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\&.
+.SH "EXAMPLE"
+.PP
+.nf
+\f(CW        /* Create a display surface with a grayscale palette */
+        SDL_Surface *screen;
+        SDL_Color colors[256];
+        int i;
+        \&.
+        \&.
+        \&.
+        /* Fill colors with color information */
+        for(i=0;i<256;i++){
+          colors[i]\&.r=i;
+          colors[i]\&.g=i;
+          colors[i]\&.b=i;
+        }
+
+        /* Create display */
+        screen=SDL_SetVideoMode(640, 480, 8, SDL_HWPALETTE);
+        if(!screen){
+          printf("Couldn\&'t set video mode: %s
+", SDL_GetError());
+          exit(-1);
+        }
+
+        /* Set palette */
+        SDL_SetPalette(screen, SDL_LOGPAL|SDL_PHYSPAL, colors, 0, 256);
+        \&.
+        \&.
+        \&.
+        \&.\fR
+.fi
+.PP
+.SH "SEE ALSO"
+.PP
+\fISDL_SetColors\fR, \fISDL_SetVideoMode\fR, \fISDL_Surface\fR, \fISDL_Color\fR
+.\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:01