From 5a0ae1117906416b8204e0cf1751f129f84bd447 Mon Sep 17 00:00:00 2001
From: Jacek Antonelli
Date: Fri, 15 Aug 2008 23:45:00 -0500
Subject: Second Life viewer sources 1.17.2.0

---
 linden/indra/llimage/llimagepng.cpp | 147 ++++++++++++++++++++++++++++++++++++
 1 file changed, 147 insertions(+)
 create mode 100644 linden/indra/llimage/llimagepng.cpp

(limited to 'linden/indra/llimage/llimagepng.cpp')

diff --git a/linden/indra/llimage/llimagepng.cpp b/linden/indra/llimage/llimagepng.cpp
new file mode 100644
index 0000000..d6b62a8
--- /dev/null
+++ b/linden/indra/llimage/llimagepng.cpp
@@ -0,0 +1,147 @@
+/*
+ * @file llimagepng.cpp
+ * @brief LLImageFormatted glue to encode / decode PNG files.
+ *
+ * Copyright (c) 2007 Peekay Semyorka.
+ * Copyright (c) 2007-2007, 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://secondlife.com/developers/opensource/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://secondlife.com/developers/opensource/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.
+ */
+
+#include "linden_common.h"
+#include "stdtypes.h"
+#include "llerror.h"
+
+#include "llimage.h"
+#include "llpngwrapper.h"
+#include "llimagepng.h"
+
+// ---------------------------------------------------------------------------
+// LLImagePNG
+// ---------------------------------------------------------------------------
+LLImagePNG::LLImagePNG()
+    : LLImageFormatted(IMG_CODEC_PNG),
+	  mTmpWriteBuffer(NULL)
+{
+}
+
+LLImagePNG::~LLImagePNG()
+{
+	if (mTmpWriteBuffer)
+	{
+		delete[] mTmpWriteBuffer;
+	}
+}
+
+// Virtual
+// Parse PNG image information and set the appropriate
+// width, height and component (channel) information.
+BOOL LLImagePNG::updateData()
+{
+    resetLastError();
+
+    // Check to make sure that this instance has been initialized with data
+    if (!getData() || (0 == getDataSize()))
+    {
+        setLastError("Uninitialized instance of LLImagePNG");
+        return FALSE;
+    }
+
+	// Decode the PNG data and extract sizing information
+	LLPngWrapper pngWrapper;
+	LLPngWrapper::ImageInfo infop;
+	if (! pngWrapper.readPng(getData(), NULL, &infop))
+	{
+		setLastError(pngWrapper.getErrorMessage());
+		return FALSE;
+	}
+
+	setSize(infop.mWidth, infop.mHeight, infop.mComponents);
+
+	return TRUE;
+}
+
+// Virtual
+// Decode an in-memory PNG image into the raw RGB or RGBA format
+// used within SecondLife.
+BOOL LLImagePNG::decode(LLImageRaw* raw_image, F32 decode_time)
+{
+	llassert_always(raw_image);
+
+    resetLastError();
+
+    // Check to make sure that this instance has been initialized with data
+    if (!getData() || (0 == getDataSize()))
+    {
+        setLastError("LLImagePNG trying to decode an image with no data!");
+        return FALSE;
+    }
+
+	// Decode the PNG data into the raw image
+	LLPngWrapper pngWrapper;
+	if (! pngWrapper.readPng(getData(), raw_image))
+	{
+		setLastError(pngWrapper.getErrorMessage());
+		return FALSE;
+	}
+
+	return TRUE;
+}
+
+// Virtual
+// Encode the in memory RGB image into PNG format.
+BOOL LLImagePNG::encode(const LLImageRaw* raw_image, F32 encode_time)
+{
+	llassert_always(raw_image);
+
+    resetLastError();
+
+	// Image logical size
+	setSize(raw_image->getWidth(), raw_image->getHeight(), raw_image->getComponents());
+
+	// Temporary buffer to hold the encoded image. Note: the final image
+	// size should be much smaller due to compression.
+	if (mTmpWriteBuffer)
+	{
+		delete[] mTmpWriteBuffer;
+	}
+	U32 bufferSize = getWidth() * getHeight() * getComponents() + 1024;
+    U8* mTmpWriteBuffer = new U8[ bufferSize ];
+
+	// Delegate actual encoding work to wrapper
+	LLPngWrapper pngWrapper;
+	if (! pngWrapper.writePng(raw_image, mTmpWriteBuffer))
+	{
+		setLastError(pngWrapper.getErrorMessage());
+		return FALSE;
+	}
+
+	// Resize internal buffer and copy from temp
+	U32 encodedSize = pngWrapper.getFinalSize();
+	allocateData(encodedSize);
+	memcpy(getData(), mTmpWriteBuffer, encodedSize);
+
+	delete[] mTmpWriteBuffer;
+
+	return TRUE;
+}
+
-- 
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