Mercurial > sdl-ios-xcode
view src/video/x11/SDL_x11gamma.c @ 5088:c2539ff054c8
Fixed compiling on Windows Mobile SDK 5.0 with Visual Studio 2008
author | Sam Lantinga <slouken@libsdl.org> |
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date | Mon, 24 Jan 2011 15:46:11 -0800 |
parents | f7b03b6838cb |
children |
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/* SDL - Simple DirectMedia Layer Copyright (C) 1997-2010 Sam Lantinga This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA Sam Lantinga slouken@libsdl.org */ #include "SDL_config.h" #include "../SDL_sysvideo.h" #include "SDL_x11video.h" /* The size of *all* SDL gamma ramps */ #define SDL_GammaRampSize (3 * 256 * sizeof(Uint16)) static int numCmaps = 0; typedef struct { Display *display; int scrNum; Colormap colormap; Visual visual; Uint16 *ramp; } cmapTableEntry; cmapTableEntry *cmapTable = NULL; /* To reduce the overhead as much as possible lets do as little as possible. When we do have to create a colormap keep track of it and reuse it. We're going to do this for both DirectColor and PseudoColor colormaps. */ Colormap X11_LookupColormap(Display * display, int scrNum, VisualID vid) { int i; for (i = 0; i < numCmaps; i++) { if (cmapTable[i].display == display && cmapTable[i].scrNum == scrNum && cmapTable[i].visual.visualid == vid) { return cmapTable[i].colormap; } } return 0; } void X11_TrackColormap(Display * display, int scrNum, Colormap colormap, Visual * visual, XColor * ramp) { int i; Uint16 *newramp; int ncolors; /* search the table to find out if we already have this one. We only want one entry for each display, screen number, visualid, and colormap combination */ for (i = 0; i < numCmaps; i++) { if (cmapTable[i].display == display && cmapTable[i].scrNum == scrNum && cmapTable[i].visual.visualid == visual->visualid && cmapTable[i].colormap == colormap) { return; } } /* increase the table by one entry. If the table is NULL create the first entrty */ cmapTable = SDL_realloc(cmapTable, (numCmaps + 1) * sizeof(cmapTableEntry)); if (NULL == cmapTable) { SDL_SetError("Out of memory in X11_TrackColormap()"); return; } cmapTable[numCmaps].display = display; cmapTable[numCmaps].scrNum = scrNum; cmapTable[numCmaps].colormap = colormap; SDL_memcpy(&cmapTable[numCmaps].visual, visual, sizeof(Visual)); cmapTable[numCmaps].ramp = NULL; if (ramp != NULL) { newramp = SDL_malloc(SDL_GammaRampSize); if (NULL == newramp) { SDL_SetError("Out of memory in X11_TrackColormap()"); return; } SDL_memset(newramp, 0, SDL_GammaRampSize); cmapTable[numCmaps].ramp = newramp; ncolors = cmapTable[numCmaps].visual.map_entries; for (i = 0; i < ncolors; i++) { newramp[(0 * 256) + i] = ramp[i].red; newramp[(1 * 256) + i] = ramp[i].green; newramp[(2 * 256) + i] = ramp[i].blue; } } numCmaps++; } /* The problem is that you have to have at least one DirectColor colormap before you can set the gamma ramps or read the gamma ramps. If the application has created a DirectColor window then the cmapTable will have at least one colormap in it and everything is cool. If not, then we just fail */ int X11_SetDisplayGammaRamp(_THIS, SDL_VideoDisplay * sdl_display, Uint16 * ramp) { Visual *visual; Display *display; Colormap colormap; XColor *colorcells; int ncolors; int rmask, gmask, bmask; int rshift, gshift, bshift; int i; int j; for (j = 0; j < numCmaps; j++) { if (cmapTable[j].visual.class == DirectColor) { display = cmapTable[j].display; colormap = cmapTable[j].colormap; ncolors = cmapTable[j].visual.map_entries; visual = &cmapTable[j].visual; colorcells = SDL_malloc(ncolors * sizeof(XColor)); if (NULL == colorcells) { SDL_SetError("out of memory in X11_SetDisplayGammaRamp"); return -1; } /* remember the new ramp */ if (cmapTable[j].ramp == NULL) { Uint16 *newramp = SDL_malloc(SDL_GammaRampSize); if (NULL == newramp) { SDL_SetError("Out of memory in X11_TrackColormap()"); return -1; } cmapTable[j].ramp = newramp; } SDL_memcpy(cmapTable[j].ramp, ramp, SDL_GammaRampSize); rshift = 0; rmask = visual->red_mask; while (0 == (rmask & 1)) { rshift++; rmask >>= 1; } /* printf("rmask = %4x rshift = %4d\n", rmask, rshift); */ gshift = 0; gmask = visual->green_mask; while (0 == (gmask & 1)) { gshift++; gmask >>= 1; } /* printf("gmask = %4x gshift = %4d\n", gmask, gshift); */ bshift = 0; bmask = visual->blue_mask; while (0 == (bmask & 1)) { bshift++; bmask >>= 1; } /* printf("bmask = %4x bshift = %4d\n", bmask, bshift); */ /* build the color table pixel values */ for (i = 0; i < ncolors; i++) { Uint32 rbits = (rmask * i) / (ncolors - 1); Uint32 gbits = (gmask * i) / (ncolors - 1); Uint32 bbits = (bmask * i) / (ncolors - 1); Uint32 pix = (rbits << rshift) | (gbits << gshift) | (bbits << bshift); colorcells[i].pixel = pix; colorcells[i].flags = DoRed | DoGreen | DoBlue; colorcells[i].red = ramp[(0 * 256) + i]; colorcells[i].green = ramp[(1 * 256) + i]; colorcells[i].blue = ramp[(2 * 256) + i]; } XStoreColors(display, colormap, colorcells, ncolors); XFlush(display); SDL_free(colorcells); } } return 0; } int X11_GetDisplayGammaRamp(_THIS, SDL_VideoDisplay * display, Uint16 * ramp) { int i; /* find the first DirectColor colormap and use it to get the gamma ramp */ for (i = 0; i < numCmaps; i++) { if (cmapTable[i].visual.class == DirectColor) { SDL_memcpy(ramp, cmapTable[i].ramp, SDL_GammaRampSize); return 0; } } return -1; }