1 files changed, 139 insertions, 0 deletions
diff --git a/indra/llimage/llimagedimensionsinfo.cpp b/indra/llimage/llimagedimensionsinfo.cpp
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+++ b/indra/llimage/llimagedimensionsinfo.cpp
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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;
+}
+