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/*
* @file llimagepng.cpp
* @brief LLImageFormatted glue to encode / decode PNG files.
*
* $LicenseInfo:firstyear=2007&license=viewerlgpl$
* 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 "llerror.h"
#include "llimage.h"
#include "llpngwrapper.h"
#include "llimagepng.h"
// ---------------------------------------------------------------------------
// LLImagePNG
// ---------------------------------------------------------------------------
LLImagePNG::LLImagePNG()
: LLImageFormatted(IMG_CODEC_PNG)
{
}
LLImagePNG::~LLImagePNG()
{
}
// Virtual
// Parse PNG image information and set the appropriate
// width, height and component (channel) information.
bool LLImagePNG::updateData()
{
resetLastError();
LLImageDataLock lock(this);
// 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;
if (!pngWrapper.isValidPng(getData()))
{
setLastError("LLImagePNG data does not have a valid PNG header!");
return false;
}
LLPngWrapper::ImageInfo infop;
if (! pngWrapper.readPng(getData(), getDataSize(), 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();
LLImageDataSharedLock lockIn(this);
LLImageDataLock lockOut(raw_image);
// 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.isValidPng(getData()))
{
setLastError("LLImagePNG data does not have a valid PNG header!");
return false;
}
if (! pngWrapper.readPng(getData(), getDataSize(), 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();
LLImageDataSharedLock lockIn(raw_image);
LLImageDataLock lockOut(this);
// 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.
U32 bufferSize = getWidth() * getHeight() * getComponents() + 8192;
U8* tmpWriteBuffer = new(std::nothrow) U8[ bufferSize ];
if (!tmpWriteBuffer)
{
setLastError("LLImagePNG::out of memory");
return false;
}
// Delegate actual encoding work to wrapper
LLPngWrapper pngWrapper;
if (!pngWrapper.writePng(raw_image, tmpWriteBuffer, bufferSize))
{
setLastError(pngWrapper.getErrorMessage());
delete[] tmpWriteBuffer;
return false;
}
// Resize internal buffer and copy from temp
U32 encodedSize = pngWrapper.getFinalSize();
allocateData(encodedSize);
memcpy(getData(), tmpWriteBuffer, encodedSize);
delete[] tmpWriteBuffer;
return true;
}
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