OZ++ Class: PNGFileWriter |
/****************************************************************************** * * Copyright (c) 2015 Antillia.com TOSHIYUKI ARAI. ALL RIGHTS RESERVED. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions, and the following disclaimer. * * 2. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * * PNGFileWriter.h * *****************************************************************************/ // 2015/07/22 This is a very simple PNG file writer based on libpng. // 2015/08/22 Fixed some bugs and, added write method. #pragma once #include <oz++/PNGFile.h> namespace OZ { class PNGFileWriter :public PNGFile { public: //2015/08/20 Modified PNGFileWriter(const char* filename, bool deleteData=true) :PNGFile(WRITE, filename, deleteData) { } ~PNGFileWriter() { } void writeInfo() { if (setJump()) { throw IException("Failed to write info-header"); } png_write_info(png_ptr, info_ptr); } // Set png_info header void setInfoHeader(png_uint_32 width, png_uint_32 height, int bitDepth, int colorType, int interlaceMethod, int compressionMethod, int filterMethod) { if (setJump()) { throw IException("Failed to write a png header"); } png_set_IHDR(png_ptr, info_ptr, width, height, bitDepth, colorType, interlaceMethod, compressionMethod, filterMethod); } // Write imageData through rows void writeImage(png_bytep* rows) { if (setJump()) { throw IException("Failed to write image data"); } png_write_image(png_ptr, rows); } void writeEnd() { if (setJump()) { throw IException("Failed to write end."); } png_write_end(png_ptr, NULL); } //2015/08/20 Added this write method based on the lpng1617\example.c //(bitDepth takes one of the values 1, 2, 4, 8 and 16. void write(png_uint_32 width, png_uint_32 height, int bitDepth, int channels, unsigned char* data, bool vertFlip = true, int colorType = PNG_COLOR_TYPE_RGBA, int interlaceMethod = PNG_INTERLACE_NONE, int compressionMethod = PNG_COMPRESSION_TYPE_BASE, int filterMethod = PNG_FILTER_TYPE_BASE) { if (data == NULL) { throw IException("Invalid argument: data is NULL"); } if (width <=0 || height <= 0) { throw IException("Invalid argument; widht or height is <=0"); } //set info header setInfoHeader(width, height, bitDepth, colorType, interlaceMethod, compressionMethod, filterMethod); setPalette(); setPacking(); //write info writeInfo(); png_bytep* rows = (png_bytep*) new png_bytep[height]; for (int i = 0; i<height; i++) { if (vertFlip) { rows[height-i-1] = data + width * channels * i; } else { rows[i] = data + width * channels * i; } } //write rows writeImage(rows); delete [] rows; //write end writeEnd(); } }; }