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#include "jpeg12_utils.h"
#include <stdexcept>
#include <cstring>
#include <csetjmp>
extern "C"
{
#include "libs/jpeg12/jpeglib12.h"
}
// #include "libs/openjp2/openjpeg.h"
namespace image
{
struct jpeg_error_struct12
{
struct jpeg_error_mgr pub;
jmp_buf setjmp_buffer;
};
static void libjpeg_error_func12(j_common_ptr cinfo)
{
longjmp(((jpeg_error_struct12 *)cinfo->err)->setjmp_buffer, 1);
}
static void libjpeg_error_func_ignore12(j_common_ptr /*cinfo*/)
{
// longjmp(((jpeg_error_struct *)cinfo->err)->setjmp_buffer, 1);
}
Image decompress_jpeg12(uint8_t *data, int length, bool ignore_errors)
{
Image img;
short *jpeg_decomp = NULL;
// Huge thanks to https://gist.github.com/PhirePhly/3080633
jpeg_error_struct12 jerr;
jpeg_decompress_struct cinfo;
// Init
cinfo.err = jpeg_std_error(&jerr.pub);
jerr.pub.error_exit = ignore_errors ? libjpeg_error_func_ignore12 : libjpeg_error_func12;
if (setjmp(jerr.setjmp_buffer))
{
// Free memory
delete[] jpeg_decomp;
return img;
}
jpeg_create_decompress(&cinfo);
// Parse and start decompressing
jpeg_mem__src12(&cinfo, data, length);
jpeg_read_header(&cinfo, FALSE);
jpeg_start_decompress(&cinfo);
// Init output buffer
jpeg_decomp = new short[cinfo.image_width * cinfo.image_height];
// Decompress
while (cinfo.output_scanline < cinfo.output_height)
{
short *buffer_array[1];
buffer_array[0] = jpeg_decomp + (cinfo.output_scanline) * cinfo.image_width;
jpeg_read_scanlines(&cinfo, buffer_array, 1);
}
// Cleanup
// jpeg_finish_decompress(&cinfo);
jpeg_destroy_decompress(&cinfo);
// Init CImg image
img = Image(16, cinfo.image_width, cinfo.image_height, 1);
// Copy over
for (int i = 0; i < (int)cinfo.image_width * (int)cinfo.image_height; i++)
img.set(i, jpeg_decomp[i] << 4);
// Free memory
delete[] jpeg_decomp;
return img;
}
}
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