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/** \file
* \brief Additional Image Quantization Operations
*
* See Copyright Notice in im_lib.h
* $Id: im_quantize.cpp,v 1.2 2009/09/25 18:40:32 scuri Exp $
*/
#include <im.h>
#include <im_util.h>
#include <im_palette.h>
#include <im_math.h>
#include "im_process_pon.h"
#include <stdlib.h>
#include <memory.h>
void imProcessQuantizeRGBUniform(const imImage* src_image, imImage* dst_image, int dither)
{
imbyte *dst_map=(imbyte*)dst_image->data[0],
*red_map=(imbyte*)src_image->data[0],
*green_map=(imbyte*)src_image->data[1],
*blue_map=(imbyte*)src_image->data[2];
imImageSetPalette(dst_image, imPaletteUniform(), 256);
for (int y = 0; y < src_image->height; y++)
{
for (int x = 0; x < src_image->width; x++)
{
if (dither)
*dst_map++ = (imbyte)imPaletteUniformIndexHalftoned(imColorEncode(*red_map++, *green_map++, *blue_map++), x, y);
else
*dst_map++ = (imbyte)imPaletteUniformIndex(imColorEncode(*red_map++, *green_map++, *blue_map++));
}
}
}
void imProcessQuantizeGrayUniform(const imImage* src_image, imImage* dst_image, int grays)
{
int i, value;
imbyte *dst_map=(imbyte*)dst_image->data[0],
*src_map=(imbyte*)src_image->data[0];
imbyte re_map[256];
memset(re_map, 0, 256);
float factor = (float)grays/256.0f;
float factor256 = 256.0f/(float)grays;
for (i = 0; i < 256; i++)
{
value = imResample(i, factor);
value = imResample(value, factor256);
re_map[i] = (imbyte)IM_BYTECROP(value);
}
int total_count = src_image->count*src_image->depth;
for (i = 0; i < total_count; i++)
dst_map[i] = re_map[src_map[i]];
}
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