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/**
* @file llimagedimensionsinfo.cpp
*
* $LicenseInfo:firstyear=2002&license=viewergpl$
*
* Copyright (c) 2002-2009, Linden Research, Inc.
*
* Second Life Viewer Source Code
* The source code in this file ("Source Code") is provided by Linden Lab
* to you under the terms of the GNU General Public License, version 2.0
* ("GPL"), unless you have obtained a separate licensing agreement
* ("Other License"), formally executed by you and Linden Lab. Terms of
* the GPL can be found in doc/GPL-license.txt in this distribution, or
* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
*
* There are special exceptions to the terms and conditions of the GPL as
* it is applied to this Source Code. View the full text of the exception
* in the file doc/FLOSS-exception.txt in this software distribution, or
* online at
* http://secondlifegrid.net/programs/open_source/licensing/flossexception
*
* By copying, modifying or distributing this software, you acknowledge
* that you have read and understood your obligations described above,
* and agree to abide by those obligations.
*
* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
* COMPLETENESS OR PERFORMANCE.
* $/LicenseInfo$
*/
#include "linden_common.h"
#include "stdtypes.h"
#include "llimagejpeg.h"
#include "llimagedimensionsinfo.h"
bool LLImageDimensionsInfo::load(const std::string& src_filename,U32 codec)
{
clean();
mSrcFilename = src_filename;
S32 file_size = 0;
apr_status_t s = mInfile.open(src_filename, LL_APR_RB, NULL, &file_size);
if (s != APR_SUCCESS)
{
setLastError("Unable to open file for reading", src_filename);
return false;
}
if (file_size == 0)
{
setLastError("File is empty",src_filename);
return false;
}
switch (codec)
{
case IMG_CODEC_BMP:
return getImageDimensionsBmp();
case IMG_CODEC_TGA:
return getImageDimensionsTga();
case IMG_CODEC_JPEG:
return getImageDimensionsJpeg();
case IMG_CODEC_PNG:
return getImageDimensionsPng();
default:
return false;
}
}
bool LLImageDimensionsInfo::getImageDimensionsBmp()
{
const S32 BMP_FILE_HEADER_SIZE = 14;
mInfile.seek(APR_CUR,BMP_FILE_HEADER_SIZE+4);
mWidth = read_reverse_s32();
mHeight = read_reverse_s32();
return true;
}
bool LLImageDimensionsInfo::getImageDimensionsTga()
{
const S32 TGA_FILE_HEADER_SIZE = 12;
mInfile.seek(APR_CUR,TGA_FILE_HEADER_SIZE);
mWidth = read_byte() | read_byte() << 8;
mHeight = read_byte() | read_byte() << 8;
return true;
}
bool LLImageDimensionsInfo::getImageDimensionsPng()
{
const S32 PNG_FILE_MARKER_SIZE = 8;
mInfile.seek(APR_CUR,PNG_FILE_MARKER_SIZE + 8/*header offset+chunk length+chunk type*/);
mWidth = read_s32();
mHeight = read_s32();
return true;
}
bool LLImageDimensionsInfo::getImageDimensionsJpeg()
{
clean();
FILE *fp = fopen (mSrcFilename.c_str(), "rb");
if (fp == NULL)
{
setLastError("Unable to open file for reading", mSrcFilename);
return false;
}
/* Init jpeg */
jpeg_error_mgr jerr;
jpeg_decompress_struct cinfo;
cinfo.err = jpeg_std_error(&jerr);
jpeg_create_decompress (&cinfo);
jpeg_stdio_src (&cinfo, fp);
jpeg_read_header (&cinfo, TRUE);
cinfo.out_color_space = JCS_RGB;
jpeg_start_decompress (&cinfo);
mHeight = cinfo.output_width;
mHeight = cinfo.output_height;
jpeg_destroy_decompress(&cinfo);
fclose(fp);
return true;
}
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