134 lines
3.0 KiB
C++
134 lines
3.0 KiB
C++
/**
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* @file llimagedimensionsinfo.cpp
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*
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* $LicenseInfo:firstyear=2002&license=viewerlgpl$
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* Second Life Viewer Source Code
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* Copyright (C) 2010, Linden Research, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation;
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* version 2.1 of the License only.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
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* $/LicenseInfo$
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*/
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#include "linden_common.h"
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#include "stdtypes.h"
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#include "llimagejpeg.h"
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#include "llimagedimensionsinfo.h"
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bool LLImageDimensionsInfo::load(const std::string& src_filename,U32 codec)
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{
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clean();
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mSrcFilename = src_filename;
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S32 file_size = 0;
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apr_status_t s = mInfile.open(src_filename, LL_APR_RB, NULL, &file_size);
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if (s != APR_SUCCESS)
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{
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setLastError("Unable to open file for reading", src_filename);
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return false;
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}
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if (file_size == 0)
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{
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setLastError("File is empty",src_filename);
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return false;
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}
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switch (codec)
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{
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case IMG_CODEC_BMP:
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return getImageDimensionsBmp();
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case IMG_CODEC_TGA:
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return getImageDimensionsTga();
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case IMG_CODEC_JPEG:
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return getImageDimensionsJpeg();
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case IMG_CODEC_PNG:
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return getImageDimensionsPng();
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default:
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return false;
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}
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}
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bool LLImageDimensionsInfo::getImageDimensionsBmp()
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{
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const S32 BMP_FILE_HEADER_SIZE = 14;
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mInfile.seek(APR_CUR,BMP_FILE_HEADER_SIZE+4);
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mWidth = read_reverse_s32();
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mHeight = read_reverse_s32();
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return true;
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}
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bool LLImageDimensionsInfo::getImageDimensionsTga()
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{
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const S32 TGA_FILE_HEADER_SIZE = 12;
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mInfile.seek(APR_CUR,TGA_FILE_HEADER_SIZE);
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mWidth = read_byte() | read_byte() << 8;
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mHeight = read_byte() | read_byte() << 8;
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return true;
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}
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bool LLImageDimensionsInfo::getImageDimensionsPng()
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{
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const S32 PNG_FILE_MARKER_SIZE = 8;
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mInfile.seek(APR_CUR,PNG_FILE_MARKER_SIZE + 8/*header offset+chunk length+chunk type*/);
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mWidth = read_s32();
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mHeight = read_s32();
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return true;
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}
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bool LLImageDimensionsInfo::getImageDimensionsJpeg()
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{
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clean();
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FILE *fp = fopen (mSrcFilename.c_str(), "rb");
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if (fp == NULL)
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{
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setLastError("Unable to open file for reading", mSrcFilename);
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return false;
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}
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/* Init jpeg */
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jpeg_error_mgr jerr;
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jpeg_decompress_struct cinfo;
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cinfo.err = jpeg_std_error(&jerr);
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jpeg_create_decompress (&cinfo);
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jpeg_stdio_src (&cinfo, fp);
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jpeg_read_header (&cinfo, TRUE);
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cinfo.out_color_space = JCS_RGB;
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jpeg_start_decompress (&cinfo);
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mHeight = cinfo.output_width;
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mHeight = cinfo.output_height;
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jpeg_destroy_decompress(&cinfo);
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fclose(fp);
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return true;
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}
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