src/video/x11/SDL_x11gamma.c
author Bob Pendleton <bob@pendleton.com>
Thu, 26 Jul 2007 17:58:17 +0000
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changed to use SDL_realloc()
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2006 Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Lesser General Public
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    License as published by the Free Software Foundation; either
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    version 2.1 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Lesser General Public License for more details.
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    You should have received a copy of the GNU Lesser General Public
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    License along with this library; if not, write to the Free Software
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    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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#include "SDL_config.h"
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#include "../SDL_sysvideo.h"
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#include "SDL_x11video.h"
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static int numCmaps = 0;
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typedef struct
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{
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    Display *display;
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    int scrNum;
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    Colormap colormap;
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    XStandardColormap cmap;
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    Visual visual;
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} cmapTableEntry;
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cmapTableEntry *cmapTable = NULL;
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/* To reduce the overhead as much as possible lets do as little as
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   possible. When we do have to create a colormap keep track of it and
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   reuse it. We're going to do this for both DirectColor and
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   PseudoColor colormaps. */
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Colormap
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X11_LookupColormap(Display * display, int scrNum, VisualID vid)
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{
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    int i;
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    for (i = 0; i < numCmaps; i++) {
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        if (cmapTable[i].display == display &&
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            cmapTable[i].scrNum == scrNum &&
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            cmapTable[i].cmap.visualid == vid) {
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            return cmapTable[i].cmap.colormap;
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        }
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    }
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    return 0;
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}
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void
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X11_TrackColormap(Display * display, int scrNum, Colormap colormap,
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                  XStandardColormap * cmap, Visual * visual)
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{
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    int i;
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    /* search the table to find out if we already have this one. We
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       only want one entry for each display, screen number, visualid,
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       and colormap combination */
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    for (i = 0; i < numCmaps; i++) {
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        if (cmapTable[i].display == display &&
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            cmapTable[i].scrNum == scrNum &&
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            cmapTable[i].cmap.visualid == cmap->visualid &&
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            cmapTable[i].cmap.colormap == colormap) {
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            return;
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        }
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    }
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    /* increase the table by one entry. If the table is NULL create the
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       first entrty */
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    cmapTable = SDL_realloc(cmapTable, (numCmaps + 1) * sizeof(cmapTableEntry));
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    if (NULL == cmapTable) {
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        SDL_SetError("Out of memory in X11_TrackColormap()");
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        return;
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    }
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    cmapTable[numCmaps].display = display;
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    cmapTable[numCmaps].scrNum = scrNum;
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    cmapTable[numCmaps].colormap = colormap;
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    SDL_memcpy(&cmapTable[numCmaps].cmap, cmap, sizeof(XStandardColormap));
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    SDL_memcpy(&cmapTable[numCmaps].visual, visual, sizeof(Visual));
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    numCmaps++;
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}
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/* The problem is that you have to have at least one DirectColor
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   colormap before you can set the gamma ramps or read the gamma
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   ramps. If the application has created a DirectColor window then the
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   cmapTable will have at least one colormap in it and everything is
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   cool. If not, then we just fail  */
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int
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X11_SetDisplayGammaRamp(_THIS, Uint16 * ramp)
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{
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    Display *display;
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    Colormap colormap;
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    XColor *colorcells;
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    int ncolors;
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    int i;
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    int j;
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    int rmax, gmax, bmax;
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    int rmul, gmul, bmul;
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    for (j = 0; j < numCmaps; j++) {
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        if (cmapTable[j].visual.class == DirectColor) {
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            display = cmapTable[j].display;
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            colormap = cmapTable[j].colormap;
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            ncolors = cmapTable[j].visual.map_entries;
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            colorcells = SDL_malloc(ncolors * sizeof(XColor));
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            if (NULL == colorcells) {
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                SDL_SetError("out of memory in X11_SetDisplayGammaRamp");
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                return -1;
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            }
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            rmax = cmapTable[j].cmap.red_max + 1;
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            gmax = cmapTable[j].cmap.blue_max + 1;
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            bmax = cmapTable[j].cmap.green_max + 1;
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            rmul = cmapTable[j].cmap.red_mult;
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            gmul = cmapTable[j].cmap.blue_mult;
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            bmul = cmapTable[j].cmap.green_mult;
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            /* build the color table pixel values */
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            for (i = 0; i < ncolors; i++) {
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                Uint32 red = (rmax * i) / ncolors;
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                Uint32 green = (gmax * i) / ncolors;
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                Uint32 blue = (bmax * i) / ncolors;
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                colorcells[i].pixel =
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                    (red * rmul) | (green * gmul) | (blue * bmul);
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                colorcells[i].flags = DoRed | DoGreen | DoBlue;
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                colorcells[i].red = ramp[(0 * 256) + i];
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                colorcells[i].green = ramp[(1 * 256) + i];
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                colorcells[i].blue = ramp[(2 * 256) + i];
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            }
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            XStoreColors(display, colormap, colorcells, ncolors);
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            XFlush(display);
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            SDL_free(colorcells);
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        }
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    }
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    return 0;
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}
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int
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X11_GetDisplayGammaRamp(_THIS, Uint16 * ramp)
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{
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    Display *display;
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    Colormap colormap;
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    XColor *colorcells;
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    int ncolors;
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    int dc;
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    int i;
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    int rmax, gmax, bmax;
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    int rmul, gmul, bmul;
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    /* find the first DirectColor colormap and use it to get the gamma
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       ramp */
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    dc = -1;
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    for (i = 0; i < numCmaps; i++) {
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        if (cmapTable[i].visual.class == DirectColor) {
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            dc = i;
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            break;
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        }
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    }
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    if (dc < 0) {
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        return -1;
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    }
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    /* there is at least one DirectColor colormap in the cmapTable,
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       let's just get the entries from that colormap */
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    display = cmapTable[dc].display;
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    colormap = cmapTable[dc].colormap;
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    ncolors = cmapTable[dc].visual.map_entries;
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    colorcells = SDL_malloc(ncolors * sizeof(XColor));
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    if (NULL == colorcells) {
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        SDL_SetError("out of memory in X11_GetDisplayGammaRamp");
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        return -1;
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    }
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    rmax = cmapTable[dc].cmap.red_max + 1;
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    gmax = cmapTable[dc].cmap.blue_max + 1;
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    bmax = cmapTable[dc].cmap.green_max + 1;
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    rmul = cmapTable[dc].cmap.red_mult;
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    gmul = cmapTable[dc].cmap.blue_mult;
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    bmul = cmapTable[dc].cmap.green_mult;
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    /* build the color table pixel values */
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    for (i = 0; i < ncolors; i++) {
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        Uint32 red = (rmax * i) / ncolors;
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        Uint32 green = (gmax * i) / ncolors;
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        Uint32 blue = (bmax * i) / ncolors;
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        colorcells[i].pixel = (red * rmul) | (green * gmul) | (blue * bmul);
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    }
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    XQueryColors(display, colormap, colorcells, ncolors);
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    /* prepare the values to be returned. Note that SDL assumes that
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       gamma ramps are always 3 * 256 entries long with the red entries
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       in the first 256 elements, the green in the second 256 elements
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       and the blue in the last 256 elements */
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    for (i = 0; i < ncolors; i++) {
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        ramp[(0 * 256) + i] = colorcells[i].red;
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        ramp[(1 * 256) + i] = colorcells[i].green;
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        ramp[(2 * 256) + i] = colorcells[i].blue;
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    }
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    SDL_free(colorcells);
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    return 0;
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}