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#include <stdio.h>
#include <stdlib.h>
#include <png.h>
#include "pes.h"
void output_png(struct pes *pes)
{
int i;
int width = pes->max_x - pes->min_x + 1;
int height = pes->max_y - pes->min_y + 1;
int outw = 128, outh = 128;
png_byte **rows;
struct pes_block *block;
png_structp png_ptr;
png_infop info_ptr;
rows = calloc(sizeof(*rows), outh);
for (i = 0; i < outh; i++)
rows[i] = calloc(sizeof(png_byte)*4, outw);
block = pes->blocks;
while (block) {
struct color *c = block->color;
struct stitch *stitch = block->stitch;
int i;
for (i = 0; i < block->nr_stitches; i++, stitch++) {
int x = (stitch->x - pes->min_x) * outw / width;
int y = (stitch->y - pes->min_y) * outh / height;
png_byte *ptr = rows[y] + x*4;
ptr[0] = c->r;
ptr[1] = c->g;
ptr[2] = c->b;
ptr[3] = 255;
}
block = block->next;
}
png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
info_ptr = png_create_info_struct(png_ptr);
png_init_io(png_ptr, stdout);
png_set_IHDR(png_ptr, info_ptr, outw, outh,
8, PNG_COLOR_TYPE_RGBA, PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
png_write_info(png_ptr, info_ptr);
png_write_image(png_ptr, rows);
png_write_end(png_ptr, NULL);
}
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