/indra/llimage/llimagepng.cpp
C++ | 136 lines | 68 code | 23 blank | 45 comment | 9 complexity | 9f38e6c41182eadf7b62e6ce533c5930 MD5 | raw file
Possible License(s): LGPL-2.1
- /*
- * @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();
- // 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.
- U32 bufferSize = getWidth() * getHeight() * getComponents() + 1024;
- U8* tmpWriteBuffer = new U8[ bufferSize ];
- // Delegate actual encoding work to wrapper
- LLPngWrapper pngWrapper;
- if (! pngWrapper.writePng(raw_image, tmpWriteBuffer))
- {
- 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;
- }