color.c File Reference

#include <config.h>
#include "mdvi.h"
#include "color.h"

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Data Structures
struct	ColorCache

Macros
#define	CCSIZE   256
#define	GAMMA_DIFF   0.005

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

Variables
static ColorCache	color_cache [CCSIZE]
static int	cc_entries

Macro Definition Documentation

#define CCSIZE   256

Definition at line 76 of file color.c.

#define GAMMA_DIFF   0.005

Definition at line 80 of file color.c.

Function Documentation

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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void mdvi_pop_color

(

DviContext *

dvi)

Definition at line 47 of file color.c.

{
    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);
}

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void mdvi_push_color	(	DviContext *	dvi,
		Ulong	fg,
		Ulong	bg
	)

Definition at line 34 of file color.c.

{
    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);
}

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void mdvi_reset_color

(

DviContext *

dvi)

Definition at line 59 of file color.c.

{
    dvi->color_top = 0;
    mdvi_set_color(dvi, dvi->params.fg, dvi->params.bg);
}

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void mdvi_set_color	(	DviContext *	dvi,
		Ulong	fg,
		Ulong	bg
	)

Definition at line 23 of file color.c.

{
    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;
    }
}

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Variable Documentation

int cc_entries

static

Definition at line 78 of file color.c.

ColorCache color_cache[CCSIZE]

static

Definition at line 77 of file color.c.