Imported existing code

indra/llimage/llpngwrapper.h

@@ -0,0 +1,105 @@
+/*
+ * @file llpngwrapper.h
+ *
+ * $LicenseInfo:firstyear=2007&license=viewergpl$
+ * 
+ * Copyright (c) 2007-2009, 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.
+ * $/LicenseInfo$
+ */
+
+#ifndef LL_LLPNGWRAPPER_H
+#define LL_LLPNGWRAPPER_H
+
+#include "libpng12/png.h"
+#include "llimage.h"
+
+class LLPngWrapper
+{
+public:
+	LLPngWrapper();
+	virtual ~LLPngWrapper();
+
+public:
+	struct ImageInfo
+	{
+		U16 mWidth;
+		U16 mHeight;
+		S8  mComponents;
+	};
+
+	BOOL isValidPng(U8* src);
+	BOOL readPng(U8* src, LLImageRaw* rawImage, ImageInfo *infop = NULL);
+	BOOL writePng(const LLImageRaw* rawImage, U8* dst);
+	U32  getFinalSize();
+	const std::string& getErrorMessage();
+
+protected:
+	void normalizeImage();
+	void updateMetaData();
+
+private:
+
+	// Structure for writing/reading PNG data to/from memory
+	// as opposed to using a file.
+	struct PngDataInfo
+	{
+		U8 *mData;
+		U32 mOffset;
+	};
+
+	static void writeFlush(png_structp png_ptr);
+	static void errorHandler(png_structp png_ptr, png_const_charp msg);
+	static void readDataCallback(png_structp png_ptr, png_bytep dest, png_size_t length);
+	static void writeDataCallback(png_structp png_ptr, png_bytep src, png_size_t length);
+
+	void releaseResources();
+
+	png_structp mReadPngPtr;
+	png_infop mReadInfoPtr;
+	png_structp mWritePngPtr;
+	png_infop mWriteInfoPtr;
+
+	U8 **mRowPointers;
+
+	png_uint_32 mWidth;
+	png_uint_32 mHeight;
+	S32 mBitDepth;
+	S32 mColorType;
+	S32 mChannels;
+	S32 mInterlaceType;
+	S32 mCompressionType;
+	S32 mFilterMethod;
+
+	U32 mFinalSize;
+
+	bool mHasBKGD;
+	png_color_16p mBackgroundColor;
+
+	F64 mGamma;
+
+	std::string mErrorMessage;
+};
+
+#endif