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/***********************************************************************/
/* */
/* OCaml */
/* */
/* Xavier Leroy, projet Cristal, INRIA Rocquencourt */
/* */
/* Copyright 1996 Institut National de Recherche en Informatique et */
/* en Automatique. All rights reserved. This file is distributed */
/* under the terms of the GNU Library General Public License, with */
/* the special exception on linking described in file ../../LICENSE. */
/* */
/***********************************************************************/
/* $Id$ */
#include "libgraph.h"
#include <X11/Xatom.h>
/* Cache to speed up the translation rgb -> pixel value. */
struct color_cache_entry {
int rgb; /* RGB value with format 0xRRGGBB */
unsigned long pixel; /* Pixel value */
};
#define Color_cache_size 512
static struct color_cache_entry color_cache[Color_cache_size];
#define Empty (-1)
#define Hash_rgb(r,g,b) \
((((r) & 0xE0) << 1) + (((g) & 0xE0) >> 2) + (((b) & 0xE0) >> 5))
#define Color_cache_slack 16
static int num_overflows = 0;
/* rgb -> pixel conversion *without* display connection */
Bool caml_gr_direct_rgb = False;
int caml_gr_red_l, caml_gr_red_r;
int caml_gr_green_l, caml_gr_green_r;
int caml_gr_blue_l, caml_gr_blue_r;
unsigned long caml_gr_red_mask, caml_gr_green_mask, caml_gr_blue_mask;
/* rgb -> pixel table */
unsigned long caml_gr_red_vals[256];
unsigned long caml_gr_green_vals[256];
unsigned long caml_gr_blue_vals[256];
void caml_gr_get_shifts( unsigned long mask, int *lsl, int *lsr )
{
int l = 0;
int r = 0;
int bit = 1;
if ( mask == 0 ){ *lsl = -1; *lsr = -1; return; }
for( l = 0; l < 32; l++ ){
if( bit & mask ){ break; }
bit = bit << 1;
}
for( r = l; r < 32; r++ ){
if( ! (bit & mask) ){ break; }
bit = bit << 1;
}
/* fix r */
if ( r == 32 ) { r = 31; }
*lsl = l;
*lsr = 16 - (r - l);
}
void caml_gr_init_direct_rgb_to_pixel(void)
{
Visual *visual;
int i;
visual = DefaultVisual(caml_gr_display,caml_gr_screen);
if ( visual->class == TrueColor || visual->class == DirectColor ){
caml_gr_red_mask = visual->red_mask;
caml_gr_green_mask = visual->green_mask;
caml_gr_blue_mask = visual->blue_mask;
#ifdef QUICKCOLORDEBUG
fprintf(stderr, "visual %lx %lx %lx\n",
caml_gr_red_mask,
caml_gr_green_mask,
caml_gr_blue_mask);
#endif
caml_gr_get_shifts(caml_gr_red_mask, &caml_gr_red_l, &caml_gr_red_r);
#ifdef QUICKCOLORDEBUG
fprintf(stderr, "red %d %d\n", caml_gr_red_l, caml_gr_red_r);
#endif
for(i=0; i<256; i++){
caml_gr_red_vals[i] = (((i << 8) + i) >> caml_gr_red_r) << caml_gr_red_l;
}
caml_gr_get_shifts(caml_gr_green_mask, &caml_gr_green_l, &caml_gr_green_r);
#ifdef QUICKCOLORDEBUG
fprintf(stderr, "green %d %d\n", caml_gr_green_l, caml_gr_green_r);
#endif
for(i=0; i<256; i++){
caml_gr_green_vals[i] = (((i << 8) + i) >> caml_gr_green_r) << caml_gr_green_l;
}
caml_gr_get_shifts(caml_gr_blue_mask, &caml_gr_blue_l, &caml_gr_blue_r);
#ifdef QUICKCOLORDEBUG
fprintf(stderr, "blue %d %d\n", caml_gr_blue_l, caml_gr_blue_r);
#endif
for(i=0; i<256; i++){
caml_gr_blue_vals[i] = (((i << 8) + i) >> caml_gr_blue_r) << caml_gr_blue_l;
}
if( caml_gr_red_l < 0 || caml_gr_red_r < 0 ||
caml_gr_green_l < 0 || caml_gr_green_r < 0 ||
caml_gr_blue_l < 0 || caml_gr_blue_r < 0 ){
#ifdef QUICKCOLORDEBUG
fprintf(stderr, "Damn, boost failed\n");
#endif
caml_gr_direct_rgb = False;
} else {
#ifdef QUICKCOLORDEBUG
fprintf(stderr, "Boost ok\n");
#endif
caml_gr_direct_rgb = True;
}
} else {
/* we cannot use direct_rgb_to_pixel */
#ifdef QUICKCOLORDEBUG
fprintf(stderr, "No boost!\n");
#endif
caml_gr_direct_rgb = False;
}
}
void caml_gr_init_color_cache(void)
{
int i;
for (i = 0; i < Color_cache_size; i++) color_cache[i].rgb = Empty;
i = Hash_rgb(0, 0, 0);
color_cache[i].rgb = 0;
color_cache[i].pixel = caml_gr_black;
i = Hash_rgb(0xFF, 0xFF, 0xFF);
color_cache[i].rgb = 0xFFFFFF;
color_cache[i].pixel = caml_gr_white;
}
unsigned long caml_gr_pixel_rgb(int rgb)
{
unsigned int r, g, b;
int h, i;
XColor color;
r = (rgb >> 16) & 0xFF;
g = (rgb >> 8) & 0xFF;
b = rgb & 0xFF;
if (caml_gr_direct_rgb){
return caml_gr_red_vals[r] | caml_gr_green_vals[g] | caml_gr_blue_vals[b];
}
h = Hash_rgb(r, g, b);
i = h;
while(1) {
if (color_cache[i].rgb == Empty) break;
if (color_cache[i].rgb == rgb) return color_cache[i].pixel;
i = (i + 1) & (Color_cache_size - 1);
if (i == h) {
/* Cache is full. Instead of inserting at slot h, which causes
thrashing if many colors hash to the same value,
insert at h + n where n is pseudo-random and
smaller than Color_cache_slack */
int slack = num_overflows++ & (Color_cache_slack - 1);
i = (i + slack) & (Color_cache_size - 1);
break;
}
}
color.red = r * 0x101;
color.green = g * 0x101;
color.blue = b * 0x101;
XAllocColor(caml_gr_display, caml_gr_colormap, &color);
color_cache[i].rgb = rgb;
color_cache[i].pixel = color.pixel;
return color.pixel;
}
int caml_gr_rgb_pixel(long unsigned int pixel)
{
register int r,g,b;
XColor color;
int i;
if (caml_gr_direct_rgb) {
r = (((pixel & caml_gr_red_mask) >> caml_gr_red_l) << 8) >> (16 - caml_gr_red_r);
g = (((pixel & caml_gr_green_mask) >> caml_gr_green_l) << 8) >> (16 - caml_gr_green_r);
b = (((pixel & caml_gr_blue_mask) >> caml_gr_blue_l) << 8) >> (16 - caml_gr_blue_r);
return (r << 16) + (g << 8) + b;
}
if (pixel == caml_gr_black) return 0;
if (pixel == caml_gr_white) return 0xFFFFFF;
/* Probably faster to do a linear search than to query the X server. */
for (i = 0; i < Color_cache_size; i++) {
if (color_cache[i].rgb != Empty && color_cache[i].pixel == pixel)
return color_cache[i].rgb;
}
color.pixel = pixel;
XQueryColor(caml_gr_display, caml_gr_colormap, &color);
return
((color.red >> 8) << 16) + ((color.green >> 8) << 8) + (color.blue >> 8);
}
value caml_gr_set_color(value vrgb)
{
int xcolor;
caml_gr_check_open();
caml_gr_color = Int_val(vrgb);
if (caml_gr_color >= 0 ){
xcolor = caml_gr_pixel_rgb(Int_val(vrgb));
XSetForeground(caml_gr_display, caml_gr_window.gc, xcolor);
XSetForeground(caml_gr_display, caml_gr_bstore.gc, xcolor);
} else {
XSetForeground(caml_gr_display, caml_gr_window.gc, caml_gr_background);
XSetForeground(caml_gr_display, caml_gr_bstore.gc, caml_gr_background);
}
return Val_unit;
}
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