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/*
* Copyright (C) 2000, Matias Atria
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <config.h>
#include "mdvi.h"
#include "color.h"
void mdvi_set_color(DviContext *dvi, Ulong fg, Ulong bg)
{
if(dvi->curr_fg != fg || dvi->curr_bg != bg) {
DEBUG((DBG_DEVICE, "setting color to (%lu,%lu)\n", fg, bg));
if(dvi->device.set_color)
dvi->device.set_color(dvi->device.device_data, fg, bg);
dvi->curr_fg = fg;
dvi->curr_bg = bg;
}
}
void mdvi_push_color(DviContext *dvi, Ulong fg, Ulong bg)
{
if(dvi->color_top == dvi->color_size) {
dvi->color_size += 32;
dvi->color_stack = mdvi_realloc(dvi->color_stack,
dvi->color_size * sizeof(DviColorPair));
}
dvi->color_stack[dvi->color_top].fg = dvi->curr_fg;
dvi->color_stack[dvi->color_top].bg = dvi->curr_bg;
dvi->color_top++;
mdvi_set_color(dvi, fg, bg);
}
void mdvi_pop_color(DviContext *dvi)
{
Ulong fg, bg;
if(dvi->color_top == 0)
return;
dvi->color_top--;
fg = dvi->color_stack[dvi->color_top].fg;
bg = dvi->color_stack[dvi->color_top].bg;
mdvi_set_color(dvi, fg, bg);
}
void mdvi_reset_color(DviContext *dvi)
{
dvi->color_top = 0;
mdvi_set_color(dvi, dvi->params.fg, dvi->params.bg);
}
/* cache for color tables, to avoid creating them for every glyph */
typedef struct {
Ulong fg;
Ulong bg;
Uint nlevels;
Ulong *pixels;
int density;
double gamma;
Uint hits;
} ColorCache;
#define CCSIZE 256
static ColorCache color_cache[CCSIZE];
static int cc_entries;
#define GAMMA_DIFF 0.005
/* create a color table */
Ulong *get_color_table(DviDevice *dev,
int nlevels, Ulong fg, Ulong bg, double gamma, int density)
{
ColorCache *cc, *tofree;
int lohits;
Ulong *pixels;
int status;
lohits = color_cache[0].hits;
tofree = &color_cache[0];
/* look in the cache and see if we have one that matches this request */
for(cc = &color_cache[0]; cc < &color_cache[cc_entries]; cc++) {
if(cc->hits < lohits) {
lohits = cc->hits;
tofree = cc;
}
if(cc->fg == fg && cc->bg == bg && cc->density == density &&
cc->nlevels == nlevels && fabs(cc->gamma - gamma) <= GAMMA_DIFF)
break;
}
if(cc < &color_cache[cc_entries]) {
cc->hits++;
return cc->pixels;
}
DEBUG((DBG_DEVICE, "Adding color table to cache (fg=%lu, bg=%lu, n=%d)\n",
fg, bg, nlevels));
/* no entry was found in the cache, create a new one */
if(cc_entries < CCSIZE) {
cc = &color_cache[cc_entries++];
cc->pixels = NULL;
} else {
cc = tofree;
mdvi_free(cc->pixels);
}
pixels = xnalloc(Ulong, nlevels);
status = dev->alloc_colors(dev->device_data,
pixels, nlevels, fg, bg, gamma, density);
if(status < 0) {
mdvi_free(pixels);
return NULL;
}
cc->fg = fg;
cc->bg = bg;
cc->gamma = gamma;
cc->density = density;
cc->nlevels = nlevels;
cc->pixels = pixels;
cc->hits = 1;
return pixels;
}
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