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ImageJPG.cpp
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ImageJPG.cpp
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/*
Copyright (C) 1996-1997 Id Software, Inc.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "quakedef.h"
#include "Texture.h"
#include "Image.h"
#include <jpeglib.h>
#include <math.h>
void Image::LoadJPG(FILE *f, char *filename, Texture *tex) {
struct jpeg_decompress_struct cinfo;
JDIMENSION num_scanlines;
JSAMPARRAY in;
struct jpeg_error_mgr jerr;
int numPixels;
int row_stride;
byte *out;
int count;
int i;
//int r, g, b;
byte *image_rgba;
// set up the decompression.
cinfo.err = jpeg_std_error(&jerr);
jpeg_create_decompress(&cinfo);
// inititalize the source
jpeg_stdio_src(&cinfo, f);
// initialize decompression
(void) jpeg_read_header(&cinfo, TRUE);
(void) jpeg_start_decompress(&cinfo);
numPixels = cinfo.image_width * cinfo.image_height;
// initialize the input buffer - we'll use the in-built memory management routines in the
// JPEG library because it will automatically free the used memory for us when we destroy
// the decompression structure. cool.
row_stride = cinfo.output_width * cinfo.output_components;
in = (*cinfo.mem->alloc_sarray) ((j_common_ptr) & cinfo, JPOOL_IMAGE, row_stride, 1);
// bit of error checking
if (cinfo.output_components != 3) {
// this should rarely (if ever) happen, but just in case...
Con_Printf("Invalid JPEG Format for file: %s\n", filename);
jpeg_destroy_decompress(&cinfo);
fclose(f);
return;
}
// initialize the return data
image_rgba = (byte *) malloc((numPixels * 4));
// read the jpeg
count = 0;
while (cinfo.output_scanline < cinfo.output_height) {
num_scanlines = jpeg_read_scanlines(&cinfo, in, 1);
out = in[0];
for (i = 0; i < row_stride;) {
image_rgba[count++] = out[i++]; //r
image_rgba[count++] = out[i++]; //g
image_rgba[count++] = out[i++]; //b
image_rgba[count++] = 255;
}
}
tex->width = cinfo.image_width;
tex->height = cinfo.image_height;
tex->bytesPerPixel = 4;
tex->setData(image_rgba);
// finish decompression and destroy the jpeg
(void) jpeg_finish_decompress(&cinfo);
jpeg_destroy_decompress(&cinfo);
fclose(f);
}