1 files changed, 133 insertions, 0 deletions
diff --git a/indra/llimage/llimagedimensionsinfo.cpp b/indra/llimage/llimagedimensionsinfo.cpp
new file mode 100644
index 0000000000..5ea4a236b5
--- /dev/null
+++ b/indra/llimage/llimagedimensionsinfo.cpp
@@ -0,0 +1,133 @@
+/** 
+ * @file llimagedimensionsinfo.cpp
+ *
+ * $LicenseInfo:firstyear=2002&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2010, Linden Research, Inc.
+ * 
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ * 
+ * This library 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
+ * Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ * 
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#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;
+}
+