344 lines
5.4 KiB
HTML
344 lines
5.4 KiB
HTML
<HTML
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><HEAD
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><TITLE
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>SDL_SetPalette</TITLE
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NAME="GENERATOR"
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>SDL Library Documentation</TH
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><H1
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><A
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NAME="SDLSETPALETTE"
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>SDL_SetPalette</A
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></H1
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><DIV
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CLASS="REFNAMEDIV"
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><A
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NAME="AEN1102"
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></A
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><H2
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>Name</H2
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>SDL_SetPalette -- Sets the colors in the palette of an 8-bit surface.</DIV
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><DIV
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CLASS="REFSYNOPSISDIV"
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><A
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NAME="AEN1105"
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></A
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><H2
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>Synopsis</H2
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><DIV
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CLASS="FUNCSYNOPSIS"
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><A
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NAME="AEN1106"
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></A
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><P
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></P
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><PRE
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CLASS="FUNCSYNOPSISINFO"
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>#include "SDL.h"</PRE
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><P
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><CODE
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><CODE
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CLASS="FUNCDEF"
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>int <B
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CLASS="FSFUNC"
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>SDL_SetPalette</B
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></CODE
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>(SDL_Surface *surface, int flags, SDL_Color *colors, int firstcolor, int ncolors);</CODE
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></P
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><P
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></P
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></DIV
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></DIV
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><DIV
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CLASS="REFSECT1"
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><A
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NAME="AEN1112"
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></A
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><H2
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>Description</H2
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><P
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>Sets a portion of the palette for the given 8-bit surface.</P
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><P
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>Palettized (8-bit) screen surfaces with the
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<TT
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CLASS="LITERAL"
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>SDL_HWPALETTE</TT
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> flag have two palettes, a logical
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palette that is used for mapping blits to/from the surface and a
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physical palette (that determines how the hardware will map the colors
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to the display). <A
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HREF="sdlblitsurface.html"
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>SDL_BlitSurface</A
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>
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always uses the logical palette when blitting surfaces (if it has to
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convert between surface pixel formats). Because of this, it is often
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useful to modify only one or the other palette to achieve various
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special color effects (e.g., screen fading, color flashes, screen dimming).</P
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><P
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>This function can modify either the logical or physical palette by
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specifing <TT
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CLASS="LITERAL"
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>SDL_LOGPAL</TT
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> or
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<TT
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CLASS="LITERAL"
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>SDL_PHYSPAL</TT
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>the in the <TT
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CLASS="PARAMETER"
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><I
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>flags</I
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></TT
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>
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parameter.</P
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><P
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>When <TT
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CLASS="PARAMETER"
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><I
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>surface</I
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></TT
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> is the surface associated with the current
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display, the display colormap will be updated with the requested colors. If
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<TT
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CLASS="LITERAL"
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>SDL_HWPALETTE</TT
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> was set in <A
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HREF="sdlsetvideomode.html"
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>SDL_SetVideoMode</A
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> flags,
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<TT
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CLASS="FUNCTION"
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>SDL_SetPalette</TT
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> will always return <SPAN
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CLASS="RETURNVALUE"
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>1</SPAN
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>,
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and the palette is guaranteed to be set the way you desire, even if the window
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colormap has to be warped or run under emulation.</P
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><P
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>The color components of a
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<A
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HREF="sdlcolor.html"
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><SPAN
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CLASS="STRUCTNAME"
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>SDL_Color</SPAN
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></A
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> structure
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are 8-bits in size, giving you a total of
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256<SUP
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>3</SUP
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>=16777216 colors.</P
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></DIV
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><DIV
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CLASS="REFSECT1"
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><A
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NAME="AEN1132"
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></A
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><H2
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>Return Value</H2
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><P
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>If <TT
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CLASS="PARAMETER"
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><I
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>surface</I
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></TT
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> is not a palettized surface, this function
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does nothing, returning <SPAN
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CLASS="RETURNVALUE"
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>0</SPAN
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>. If all of the colors were set
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as passed to <TT
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CLASS="FUNCTION"
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>SDL_SetPalette</TT
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>, it will return
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<SPAN
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CLASS="RETURNVALUE"
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>1</SPAN
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>. If not all the color entries were set exactly as
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given, it will return <SPAN
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CLASS="RETURNVALUE"
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>0</SPAN
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>, and you should look at the
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surface palette to determine the actual color palette.</P
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></DIV
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><DIV
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CLASS="REFSECT1"
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><A
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NAME="AEN1140"
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></A
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><H2
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>Example</H2
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><PRE
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CLASS="PROGRAMLISTING"
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> /* Create a display surface with a grayscale palette */
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SDL_Surface *screen;
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SDL_Color colors[256];
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int i;
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.
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.
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.
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/* Fill colors with color information */
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for(i=0;i<256;i++){
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colors[i].r=i;
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colors[i].g=i;
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colors[i].b=i;
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}
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/* Create display */
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screen=SDL_SetVideoMode(640, 480, 8, SDL_HWPALETTE);
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if(!screen){
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printf("Couldn't set video mode: %s\n", SDL_GetError());
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exit(-1);
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}
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/* Set palette */
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SDL_SetPalette(screen, SDL_LOGPAL|SDL_PHYSPAL, colors, 0, 256);
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.
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.
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.
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.</PRE
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></DIV
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><DIV
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CLASS="REFSECT1"
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><A
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NAME="AEN1143"
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></A
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><H2
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>See Also</H2
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><P
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><A
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HREF="sdlsetcolors.html"
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>SDL_SetColors</A
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>,
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<A
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HREF="sdlsetvideomode.html"
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>SDL_SetVideoMode</A
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>,
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<A
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HREF="sdlsurface.html"
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>SDL_Surface</A
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>,
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<A
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HREF="sdlcolor.html"
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>SDL_Color</A
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></P
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>Prev</A
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>Home</A
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>SDL_SetColors</TD
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