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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <jpeglib.h>
#include "jpeg_image.H"
#undef XJIG_JPEG_DEBUG
jpegImage::jpegImage(const char *filename, int autocrop )
: Image(filename, autocrop)
{
LoadImageFile( filename );
if (autocrop) CropImage();
}
/*****************************/
int jpegImage::LoadImageFile(FILE *fp)
/*****************************/
{
struct jpeg_decompress_struct cinfo;
struct jpeg_error_mgr jerr;
int i, j, copied_lines;
cinfo.err = jpeg_std_error(&jerr);
jpeg_create_decompress(&cinfo);
jpeg_stdio_src(&cinfo, fp);
jpeg_read_header(&cinfo, TRUE);
/* Ask for palettized RGB output */
cinfo.out_color_space = JCS_RGB;
cinfo.quantize_colors = TRUE;
jpeg_start_decompress(&cinfo);
width=cinfo.output_width;
height=cinfo.output_height;
#ifdef XJIG_JPEG_DEBUG
fprintf(stderr, "jpeg width=%d height=%d\n", width, height);
if(cinfo.output_components!=1) {
fprintf(stderr, "Not getting palettized output from libjpeg!\n");
exit(1);
}
#endif
data=(byte *)malloc(width*height*sizeof *data);
if(!data) {
fprintf(stderr, "Not enough memory to store jpeg data");
exit(1);
}
JSAMPARRAY lines=(JSAMPARRAY)malloc(cinfo.rec_outbuf_height*sizeof *lines);
if(!lines) {
fprintf(stderr, "Not enough memory to for temporary jpeg buffer");
exit(1);
}
for(i=0 ; i<cinfo.rec_outbuf_height ; ++i) {
lines[i]=(JSAMPROW)malloc(width*sizeof *lines[i]);
if(!lines[i]) {
fprintf(stderr, "Not enough memory to for temporary jpeg buffer");
exit(1);
}
}
copied_lines=0;
while(cinfo.output_scanline < cinfo.output_height) {
int gotlines=jpeg_read_scanlines(&cinfo, lines, cinfo.rec_outbuf_height);
#ifdef XJIG_JPEG_DEBUG
fprintf(stderr, "got %d lines from jpeg\n", gotlines);
#endif
for(i=0;i<gotlines;++i)
for(j=0;j<width;++j)
data[(copied_lines+i)*width+j]=lines[i][j];
copied_lines+=i;
#ifdef XJIG_JPEG_DEBUG
fprintf(stderr, "have now filled in %d lines of data\n", copied_lines);
#endif
}
for(i=0 ; i<cinfo.rec_outbuf_height ; ++i)
free(lines[i]);
free(lines);
HasColormap=1;
ColorMapSize=cinfo.actual_number_of_colors;
for(i=0;i<ColorMapSize;++i) {
Red[i] = cinfo.colormap[0][i];
Green[i] = cinfo.colormap[1][i];
Blue[i] = cinfo.colormap[2][i];
}
Background=-1;
jpeg_finish_decompress(&cinfo);
jpeg_destroy_decompress(&cinfo);
return 0;
}
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