diff options
Diffstat (limited to 'indra/llimage/llpngwrapper.cpp')
| -rwxr-xr-x[-rw-r--r--] | indra/llimage/llpngwrapper.cpp | 67 |
1 files changed, 29 insertions, 38 deletions
diff --git a/indra/llimage/llpngwrapper.cpp b/indra/llimage/llpngwrapper.cpp index 0dd991a63b..aad139f570 100644..100755 --- a/indra/llimage/llpngwrapper.cpp +++ b/indra/llimage/llpngwrapper.cpp @@ -2,31 +2,25 @@ * @file llpngwrapper.cpp * @brief Encapsulates libpng read/write functionality. * - * $LicenseInfo:firstyear=2007&license=viewergpl$ - * - * Copyright (c) 2007-2009, Linden Research, Inc. - * + * $LicenseInfo:firstyear=2007&license=viewerlgpl$ * 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 + * Copyright (C) 2010, Linden Research, Inc. * - * 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 + * 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. * - * 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. + * 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. * - * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO - * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY, - * COMPLETENESS OR PERFORMANCE. + * 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 * $/LicenseInfo$ */ @@ -56,8 +50,6 @@ LLPngWrapper::LLPngWrapper() mCompressionType( 0 ), mFilterMethod( 0 ), mFinalSize( 0 ), - mHasBKGD(false), - mBackgroundColor(), mGamma(0.f) { } @@ -95,6 +87,12 @@ void LLPngWrapper::errorHandler(png_structp png_ptr, png_const_charp msg) void LLPngWrapper::readDataCallback(png_structp png_ptr, png_bytep dest, png_size_t length) { PngDataInfo *dataInfo = (PngDataInfo *) png_get_io_ptr(png_ptr); + if(dataInfo->mOffset + length > dataInfo->mDataSize) + { + png_error(png_ptr, "Data read error. Requested data size exceeds available data size."); + return; + } + U8 *src = &dataInfo->mData[dataInfo->mOffset]; memcpy(dest, src, length); dataInfo->mOffset += static_cast<U32>(length); @@ -117,12 +115,12 @@ void LLPngWrapper::writeFlush(png_structp png_ptr) } // Read the PNG file using the libpng. The low-level interface is used here -// because we want to do various transformations (including setting the -// matte background if any, and applying gama) which can't be done with -// the high-level interface. The scanline also begins at the bottom of +// because we want to do various transformations (including applying gama) +// which can't be done with the high-level interface. +// The scanline also begins at the bottom of // the image (per SecondLife conventions) instead of at the top, so we // must assign row-pointers in "reverse" order. -BOOL LLPngWrapper::readPng(U8* src, LLImageRaw* rawImage, ImageInfo *infop) +BOOL LLPngWrapper::readPng(U8* src, S32 dataSize, LLImageRaw* rawImage, ImageInfo *infop) { try { @@ -141,6 +139,7 @@ BOOL LLPngWrapper::readPng(U8* src, LLImageRaw* rawImage, ImageInfo *infop) PngDataInfo dataPtr; dataPtr.mData = src; dataPtr.mOffset = 0; + dataPtr.mDataSize = dataSize; png_set_read_fn(mReadPngPtr, &dataPtr, &readDataCallback); png_set_sig_bytes(mReadPngPtr, 0); @@ -207,8 +206,7 @@ void LLPngWrapper::normalizeImage() // 2. Convert grayscales to RGB // 3. Create alpha layer from transparency // 4. Ensure 8-bpp for all images - // 5. Apply background matte if any - // 6. Set (or guess) gamma + // 5. Set (or guess) gamma if (mColorType == PNG_COLOR_TYPE_PALETTE) { @@ -216,7 +214,7 @@ void LLPngWrapper::normalizeImage() } if (mColorType == PNG_COLOR_TYPE_GRAY && mBitDepth < 8) { - png_set_gray_1_2_4_to_8(mReadPngPtr); + png_set_expand_gray_1_2_4_to_8(mReadPngPtr); } if (mColorType == PNG_COLOR_TYPE_GRAY || mColorType == PNG_COLOR_TYPE_GRAY_ALPHA) @@ -235,12 +233,6 @@ void LLPngWrapper::normalizeImage() { png_set_strip_16(mReadPngPtr); } - mHasBKGD = png_get_bKGD(mReadPngPtr, mReadInfoPtr, &mBackgroundColor); - if (mHasBKGD) - { - png_set_background(mReadPngPtr, mBackgroundColor, - PNG_BACKGROUND_GAMMA_FILE, 1, 1.0); - } #if LL_DARWIN const F64 SCREEN_GAMMA = 1.8; @@ -267,7 +259,6 @@ void LLPngWrapper::updateMetaData() mBitDepth = png_get_bit_depth(mReadPngPtr, mReadInfoPtr); mColorType = png_get_color_type(mReadPngPtr, mReadInfoPtr); mChannels = png_get_channels(mReadPngPtr, mReadInfoPtr); - mHasBKGD = png_get_bKGD(mReadPngPtr, mReadInfoPtr, &mBackgroundColor); } // Method to write raw image into PNG at dest. The raw scanline begins @@ -364,7 +355,7 @@ void LLPngWrapper::releaseResources() { if (mReadPngPtr || mReadInfoPtr) { - png_destroy_read_struct(&mReadPngPtr, &mReadInfoPtr, png_infopp_NULL); + png_destroy_read_struct(&mReadPngPtr, &mReadInfoPtr, NULL); mReadPngPtr = NULL; mReadInfoPtr = NULL; } |