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/*
* Pixmap manipulation
*
* (C) Copyright 2001-2003 Geert Uytterhoeven
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive for
* more details.
*/
#include <stdlib.h>
#include "types.h"
#include "clut.h"
#include "image.h"
#include "pixmap.h"
#include "visual.h"
#include "visops.h"
#include "util.h"
static void image_bw_to_pixmap(const struct image *image, pixel_t *pixmap);
static void image_lut256_to_pixmap(const struct image *image, pixel_t *pixmap);
static void image_rgb888_to_pixmap(const struct image *image, pixel_t *pixmap);
/*
* Convert an image to a pixmap
*/
pixel_t *create_pixmap(const struct image *image)
{
pixel_t *pixmap;
pixmap = malloc(image->width*image->height*sizeof(pixel_t));
if (!pixmap)
Fatal("Not enough memory\n");
switch (image->type) {
case IMAGE_BW:
image_bw_to_pixmap(image, pixmap);
break;
case IMAGE_GREY256:
case IMAGE_CLUT256:
image_lut256_to_pixmap(image, pixmap);
break;
case IMAGE_RGB888:
image_rgb888_to_pixmap(image, pixmap);
break;
default:
Fatal("Unknown image type %d\n", image->type);
break;
}
return pixmap;
}
/*
* Convert a black-and-white image to a pixmap
*/
static const unsigned char bitmask[8] = {
0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01
};
static void image_bw_to_pixmap(const struct image *image, pixel_t *pixmap)
{
pixel_t black, white;
const unsigned char *src;
pixel_t *dst;
int i, j, k;
black = match_color(&clut_mono[0]);
white = match_color(&clut_mono[1]);
src = image->data;
dst = pixmap;
for (i = 0; i < image->height; i++) {
for (j = 0, k = 0; j < image->width; j++, k = (k+1) & 7) {
*dst++ = (*src & bitmask[k]) ? white : black;
if (k == 7)
src++;
}
if (k)
src++;
}
}
/*
* Convert a GREY256/CLUT256 image to a pixmap
*/
static pixel_t lut[256];
static void image_lut256_to_pixmap(const struct image *image, pixel_t *pixmap)
{
rgba_t color;
const unsigned char *src;
pixel_t *dst;
int i;
color.a = 65535;
if (image->type == IMAGE_GREY256) {
for (i = 0; i < 256; i++) {
color.r = color.g = color.b = EXPAND_TO_16BIT(i, 255);
lut[i] = match_color(&color);
}
} else {
src = image->clut;
for (i = 0; i < image->clut_len; i++) {
color.r = EXPAND_TO_16BIT(*src++, 255);
color.g = EXPAND_TO_16BIT(*src++, 255);
color.b = EXPAND_TO_16BIT(*src++, 255);
lut[i] = match_color(&color);
}
}
src = image->data;
dst = pixmap;
for (i = 0; i < image->width*image->height; i++)
*dst++ = lut[*src++];
}
/*
* Convert an RGB888 image to a pixmap
*/
static void image_rgb888_to_pixmap(const struct image *image, pixel_t *pixmap)
{
const unsigned char *src;
pixel_t *dst;
rgba_t color;
int i;
src = image->data;
dst = pixmap;
color.a = 65535;
for (i = 0; i < image->width*image->height; i++) {
color.r = EXPAND_TO_16BIT(*src++, 255);
color.g = EXPAND_TO_16BIT(*src++, 255);
color.b = EXPAND_TO_16BIT(*src++, 255);
*dst++ = match_color(&color);
}
}
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