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jpeg.c    214 lines (155 with data), 4.9 kB

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#include <stdio.h>
//#include <jpeglib.h>
//#define __NO_SYSTEM__
#include "filter.h"
#include "metadata.h"
#include "file.h"
#include "jpegicc.h"
int writeJPEG(Image * im, char * filename, int quality, int progressive)
{
struct jpeg_compress_struct cinfo;
struct jpeg_error_mgr jerr;
FILE *outfile;
int scanlines_written;
unsigned char *data, *buf;
cinfo.err = jpeg_std_error(&jerr);
jpeg_create_compress(&cinfo);
if ((outfile = fopen(filename, "wb")) == NULL)
{
PrintError("can't open %s", filename);
return -1;
}
TwoToOneByte(im);
jpeg_stdio_dest(&cinfo, outfile);
cinfo.image_width = im->width; /* image width and height, in pixels */
cinfo.image_height = im->height;
cinfo.input_components = 3; /* # of color components per pixel */
cinfo.in_color_space = JCS_RGB; /* colorspace of input image */
jpeg_set_defaults(&cinfo);
if (2 != (progressive & 2))
cinfo.optimize_coding = TRUE;
jpeg_set_quality(&cinfo, quality, TRUE);
if (1 == (progressive & 1))
jpeg_simple_progression(&cinfo);
jpeg_start_compress(&cinfo, TRUE);
// Write ICC Profile if it exists
if (im->metadata.iccProfile.size > 0) {
jpegICCWriteProfile(&cinfo,
(JOCTET *)im->metadata.iccProfile.data,
im->metadata.iccProfile.size);
}
scanlines_written = 0;
data = *(im->data);
buf = (unsigned char *) malloc((size_t) im->bytesPerLine);
if (buf == NULL)
{
PrintError("Not enough memory");
fclose(outfile);
return -1;
}
while (scanlines_written < im->height)
{
memcpy(buf, data, (size_t) im->bytesPerLine);
if (im->bitsPerPixel == 32) // Convert 4->3 samples
{
int x;
unsigned char *c1 = buf, *c2 = buf;
for (x = 0; x < im->width; x++)
{
c2++;
*c1++ = *c2++;
*c1++ = *c2++;
*c1++ = *c2++;
}
}
if (jpeg_write_scanlines(&cinfo, (JSAMPARRAY) & buf, 1))
{
scanlines_written++;
data += im->bytesPerLine;
}
}
jpeg_finish_compress(&cinfo);
jpeg_destroy_compress(&cinfo);
fclose(outfile);
free(buf);
return 0;
}
int readJPEG(Image * im, char *filename)
{
struct jpeg_decompress_struct cinfo;
struct jpeg_error_mgr jerr;
FILE *infile;
int scan_lines_to_be_read, scan_lines_read;
unsigned int i, scanheight;
unsigned char *data;
JSAMPARRAY sarray;
JOCTET *ptr = NULL;
unsigned int size = 0;
//PrintError("%s", sfile->name);
cinfo.err = jpeg_std_error(&jerr);
jpeg_create_decompress(&cinfo);
// Prepare the library for reading the ICC profile, see its source code
// for further information
jpegICCSetupReadICCProfile(&cinfo);
if ((infile = fopen(filename, "rb")) == NULL) {
PrintError("can't open %s", filename);
return -1;
}
jpeg_stdio_src(&cinfo, infile);
jpeg_read_header(&cinfo, TRUE);
jpeg_start_decompress(&cinfo);
SetImageDefaults(im);
im->width = cinfo.output_width;
im->height = cinfo.output_height;
if (cinfo.output_components != 3)
{
PrintError("Image must be rgb");
fclose(infile);
return -1;
}
im->bitsPerPixel = 24;
im->bytesPerLine = im->width * 3;
im->dataSize = im->width * 4 * im->height;
im->data = (unsigned char **) mymalloc((size_t) im->dataSize);
if (im->data == NULL)
{
PrintError("Not enough memory");
fclose(infile);
return -1;
}
scanheight = cinfo.rec_outbuf_height;
sarray = (JSAMPARRAY) malloc(scanheight * sizeof(JSAMPROW));
scan_lines_to_be_read = im->height;
data = *(im->data);
while (scan_lines_to_be_read)
{
for (i = 0; i < scanheight; i++)
{
sarray[i] = (JSAMPROW) (data + i * im->bytesPerLine);
}
scan_lines_read = jpeg_read_scanlines(&cinfo, sarray, scanheight);
scan_lines_to_be_read -= scan_lines_read;
data += scan_lines_read * im->bytesPerLine;
}
// read ICC profile
if (jpegICCReadProfile(&cinfo, &ptr, &size)) {
im->metadata.iccProfile.size = size;
im->metadata.iccProfile.data = (char*) ptr;
}
jpeg_finish_decompress(&cinfo);
jpeg_destroy_decompress(&cinfo);
ThreeToFourBPP(im);
free(sarray);
fclose(infile);
return 0;
}
// this function is very likely to change
// so it should be considered a hack until
// we are able to read all the JPEG metadata
int panoJPEGRead(Image * im, char * sfile)
{
if ( readJPEG(im, sfile) == 0) {
return panoMetadataUpdateFromImage(im);
} else
return FALSE;
}