color.h File Reference

#include "common.h"

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Functions
Ulong *	get_color_table (DviDevice *dev, int nlevels, Ulong fg, Ulong bg, double gamma, int density)
void mdvi_set_color	__PROTO ((DviContext *, Ulong, Ulong))
void mdvi_pop_color	__PROTO ((DviContext *))

Function Documentation

void mdvi_set_color __PROTO

(

(DviContext *, Ulong, Ulong)

)

void mdvi_pop_color __PROTO

(

(DviContext *)

)

Ulong* get_color_table	(	DviDevice *	dev,
		int	nlevels,
		Ulong	fg,
		Ulong	bg,
		double	gamma,
		int	density
	)

Definition at line 84 of file color.c.

{
    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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