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/*
* @file llimagepng.cpp
* @brief LLImageFormatted glue to encode / decode PNG files.
*
* $LicenseInfo:firstyear=2007&license=viewergpl$
*
* 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.
* $/LicenseInfo$
*/
#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());
delete[] mTmpWriteBuffer;
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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