pngPtr            300 Source/platform/image-decoders/png/PNGImageDecoder.cpp     png_structp png = m_reader->pngPtr();
pngPtr            403 Source/platform/image-decoders/png/PNGImageDecoder.cpp         png_structp png = m_reader->pngPtr();
pngPtr            480 Source/platform/image-decoders/png/PNGImageDecoder.cpp         png_progressive_combine_row(m_reader->pngPtr(), row, rowBuffer);