231 lines
6.1 KiB
C
231 lines
6.1 KiB
C
/***********************************************************************/
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/* */
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/* Objective Caml */
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/* */
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/* Xavier Leroy, projet Cristal, INRIA Rocquencourt */
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/* */
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/* Copyright 1996 Institut National de Recherche en Informatique et */
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/* en Automatique. All rights reserved. This file is distributed */
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/* under the terms of the GNU Library General Public License, with */
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/* the special exception on linking described in file ../../LICENSE. */
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/* */
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/***********************************************************************/
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/* $Id$ */
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#include "libgraph.h"
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#include <X11/Xatom.h>
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/* Cache to speed up the translation rgb -> pixel value. */
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struct color_cache_entry {
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int rgb; /* RGB value with format 0xRRGGBB */
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unsigned long pixel; /* Pixel value */
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};
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#define Color_cache_size 512
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static struct color_cache_entry color_cache[Color_cache_size];
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#define Empty (-1)
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#define Hash_rgb(r,g,b) \
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((((r) & 0xE0) << 1) + (((g) & 0xE0) >> 2) + (((b) & 0xE0) >> 5))
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#define Color_cache_slack 16
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static int num_overflows = 0;
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/* rgb -> pixel conversion *without* display connection */
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Bool direct_rgb = False;
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int red_l, red_r;
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int green_l, green_r;
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int blue_l, blue_r;
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unsigned long red_mask, green_mask, blue_mask;
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/* rgb -> pixel table */
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unsigned long red_vals[256];
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unsigned long green_vals[256];
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unsigned long blue_vals[256];
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void get_shifts( unsigned long mask, int *lsl, int *lsr )
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{
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int l = 0;
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int r = 0;
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int bit = 1;
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if ( mask == 0 ){ *lsl = -1; *lsr = -1; return; }
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for( l = 0; l < 32; l++ ){
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if( bit & mask ){ break; }
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bit = bit << 1;
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}
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for( r = l; r < 32; r++ ){
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if( ! (bit & mask) ){ break; }
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bit = bit << 1;
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}
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/* fix r */
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if ( r == 32 ) { r = 31; }
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*lsl = l;
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*lsr = 16 - (r - l);
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}
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void gr_init_direct_rgb_to_pixel(void)
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{
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Visual *visual;
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int i;
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visual = DefaultVisual(grdisplay,grscreen);
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if ( visual->class == TrueColor || visual->class == DirectColor ){
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int lsl, lsr;
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red_mask = visual->red_mask;
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green_mask = visual->green_mask;
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blue_mask = visual->blue_mask;
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#ifdef QUICKCOLORDEBUG
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fprintf(stderr, "visual %lx %lx %lx\n",
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red_mask,
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green_mask,
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blue_mask);
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#endif
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get_shifts(red_mask, &red_l, &red_r);
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#ifdef QUICKCOLORDEBUG
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fprintf(stderr, "red %d %d\n", red_l, red_r);
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#endif
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for(i=0; i<256; i++){
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red_vals[i] = (((i << 8) + i) >> red_r) << red_l;
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}
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get_shifts(green_mask, &green_l, &green_r);
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#ifdef QUICKCOLORDEBUG
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fprintf(stderr, "green %d %d\n", green_l, green_r);
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#endif
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for(i=0; i<256; i++){
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green_vals[i] = (((i << 8) + i) >> green_r) << green_l;
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}
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get_shifts(blue_mask, &blue_l, &blue_r);
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#ifdef QUICKCOLORDEBUG
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fprintf(stderr, "blue %d %d\n", blue_l, blue_r);
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#endif
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for(i=0; i<256; i++){
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blue_vals[i] = (((i << 8) + i) >> blue_r) << blue_l;
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}
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if( red_l < 0 || red_r < 0 ||
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green_l < 0 || green_r < 0 ||
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blue_l < 0 || blue_r < 0 ){
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#ifdef QUICKCOLORDEBUG
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fprintf(stderr, "Damn, boost failed\n");
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#endif
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direct_rgb = False;
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} else {
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#ifdef QUICKCOLORDEBUG
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fprintf(stderr, "Boost ok\n");
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#endif
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direct_rgb = True;
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}
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} else {
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/* we cannot use direct_rgb_to_pixel */
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#ifdef QUICKCOLORDEBUG
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fprintf(stderr, "No boost!\n");
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#endif
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direct_rgb = False;
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}
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}
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void gr_init_color_cache(void)
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{
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int i;
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for (i = 0; i < Color_cache_size; i++) color_cache[i].rgb = Empty;
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i = Hash_rgb(0, 0, 0);
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color_cache[i].rgb = 0;
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color_cache[i].pixel = grblack;
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i = Hash_rgb(0xFF, 0xFF, 0xFF);
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color_cache[i].rgb = 0xFFFFFF;
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color_cache[i].pixel = grwhite;
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}
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unsigned long gr_pixel_rgb(int rgb)
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{
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unsigned int r, g, b;
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int h, i;
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XColor color;
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unsigned short tmp;
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r = (rgb >> 16) & 0xFF;
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g = (rgb >> 8) & 0xFF;
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b = rgb & 0xFF;
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if (direct_rgb){
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return red_vals[r] | green_vals[g] | blue_vals[b];
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}
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h = Hash_rgb(r, g, b);
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i = h;
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while(1) {
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if (color_cache[i].rgb == Empty) break;
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if (color_cache[i].rgb == rgb) return color_cache[i].pixel;
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i = (i + 1) & (Color_cache_size - 1);
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if (i == h) {
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/* Cache is full. Instead of inserting at slot h, which causes
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thrashing if many colors hash to the same value,
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insert at h + n where n is pseudo-random and
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smaller than Color_cache_slack */
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int slack = num_overflows++ & (Color_cache_slack - 1);
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i = (i + slack) & (Color_cache_size - 1);
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break;
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}
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}
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color.red = r * 0x101;
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color.green = g * 0x101;
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color.blue = b * 0x101;
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XAllocColor(grdisplay, grcolormap, &color);
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color_cache[i].rgb = rgb;
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color_cache[i].pixel = color.pixel;
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return color.pixel;
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}
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int gr_rgb_pixel(long unsigned int pixel)
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{
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register int r,g,b;
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XColor color;
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int i;
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if (direct_rgb) {
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r = (((pixel & red_mask) >> red_l) << 8) >> (16 - red_r);
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g = (((pixel & green_mask) >> green_l) << 8) >> (16 - green_r);
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b = (((pixel & blue_mask) >> blue_l) << 8) >> (16 - blue_r);
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return (r << 16) + (g << 8) + b;
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}
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if (pixel == grblack) return 0;
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if (pixel == grwhite) return 0xFFFFFF;
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/* Probably faster to do a linear search than to query the X server. */
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for (i = 0; i < Color_cache_size; i++) {
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if (color_cache[i].rgb != Empty && color_cache[i].pixel == pixel)
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return color_cache[i].rgb;
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}
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color.pixel = pixel;
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XQueryColor(grdisplay, grcolormap, &color);
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return
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((color.red >> 8) << 16) + ((color.green >> 8) << 8) + (color.blue >> 8);
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}
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value gr_set_color(value vrgb)
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{
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int xcolor;
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gr_check_open();
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grcolor = Int_val(vrgb);
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if (grcolor >= 0 ){
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xcolor = gr_pixel_rgb(Int_val(vrgb));
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XSetForeground(grdisplay, grwindow.gc, xcolor);
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XSetForeground(grdisplay, grbstore.gc, xcolor);
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} else {
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XSetForeground(grdisplay, grwindow.gc, grbackground);
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XSetForeground(grdisplay, grbstore.gc, grbackground);
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}
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return Val_unit;
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}
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