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95 lines
2.3 KiB
95 lines
2.3 KiB
//
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// png.hpp
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// ImageStreams
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//
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// Created by Joshua Moerman on 9/7/12.
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// Copyright (c) 2012 Vadovas. All rights reserved.
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//
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#ifndef ImageStreams_png_hpp
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#define ImageStreams_png_hpp
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#include <cstdio>
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#include <stdexcept>
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#include <vector>
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#include <png.h>
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#include "basics.hpp"
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namespace png{
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template <typename P>
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int color_type(){
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int num_colors = pixel_formats::traits<P>::num_colors;
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switch (num_colors) {
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case 1: return PNG_COLOR_TYPE_GRAY;
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case 2: return PNG_COLOR_TYPE_GRAY_ALPHA;
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case 3: return PNG_COLOR_TYPE_RGB;
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case 4: return PNG_COLOR_TYPE_RGB_ALPHA;
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default: return PNG_COLOR_TYPE_RGB;
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}
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}
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template <typename P = pixel_formats::rgb>
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struct ostream{
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typedef P pixel;
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ostream() = delete;
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ostream(ostream const &) = delete;
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ostream & operator=(ostream const &) = delete;
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ostream(uint32_t width, uint32_t height, std::string filename)
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: fp(0)
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, png_ptr(0)
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, info_ptr(0)
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, row(width)
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, x(0)
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{
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fp = fopen(filename.c_str(), "wb");
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if(!fp) throw std::runtime_error("Could not open file");
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png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0);
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if(!png_ptr) throw std::runtime_error("PNG structure could not be allocated");
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info_ptr = png_create_info_struct(png_ptr);
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if(!info_ptr) throw std::runtime_error("PNG information structure could not be allocated");
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png_init_io(png_ptr, fp);
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png_set_IHDR(png_ptr, info_ptr, width, height, pixel_formats::traits<pixel>::bits_per_color, color_type<pixel>(), PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
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png_set_compression_level(png_ptr, 9);
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png_write_info(png_ptr, info_ptr);
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}
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~ostream(){
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// NOTE: the pnglib already checks for us whether all pixels are written
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png_write_end(png_ptr, info_ptr);
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png_destroy_info_struct(png_ptr, &info_ptr);
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fclose(fp);
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}
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ostream& operator<<(pixel const & p){
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row[x] = p;
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++x;
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if(x >= row.size()){
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png_write_row(png_ptr, reinterpret_cast<unsigned char const*>(row.data()));
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x = 0;
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}
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return *this;
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}
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private:
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FILE* fp;
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png_structp png_ptr;
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png_infop info_ptr;
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std::vector<pixel> row;
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uint32_t x;
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};
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typedef ostream<> colored_ostream;
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typedef ostream<pixel_formats::gray> gray_ostream;
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}
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#endif
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