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#include "gr3.h"
#include <stdio.h>
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include <jpeglib.h>
#include "gr3_internals.h"
int gr3_export_jpeg_(const char *filename, int width, int height)
{
FILE *jpegfp;
char *pixels;
int err;
struct jpeg_compress_struct cinfo;
struct jpeg_error_mgr jerr;
jpegfp = fopen(filename, "wb");
if (!jpegfp)
{
RETURN_ERROR(GR3_ERROR_CANNOT_OPEN_FILE);
}
pixels = (char *)malloc(width * height * 3);
if (!pixels)
{
RETURN_ERROR(GR3_ERROR_OUT_OF_MEM);
}
err = gr3_getimage(width, height, FALSE, pixels);
if (err != GR3_ERROR_NONE)
{
fclose(jpegfp);
free(pixels);
return err;
}
cinfo.err = jpeg_std_error(&jerr);
jpeg_create_compress(&cinfo);
jpeg_stdio_dest(&cinfo, jpegfp);
cinfo.image_width = width;
cinfo.image_height = height;
cinfo.input_components = 3;
cinfo.in_color_space = JCS_RGB;
jpeg_set_defaults(&cinfo);
jpeg_set_quality(&cinfo, 100, TRUE);
jpeg_start_compress(&cinfo, TRUE);
while (cinfo.next_scanline < cinfo.image_height)
{
JSAMPROW row_pointer[1];
row_pointer[0] = (JSAMPLE *)(pixels + 3 * (height - cinfo.next_scanline - 1) * width);
jpeg_write_scanlines(&cinfo, row_pointer, 1);
}
jpeg_finish_compress(&cinfo);
jpeg_destroy_compress(&cinfo);
fclose(jpegfp);
free(pixels);
return GR3_ERROR_NONE;
}
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