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103 lines
2.2 KiB
103 lines
2.2 KiB
//
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// ImageFormatPNG.hpp
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// AwesomeAttractorND
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//
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// Created by Joshua Moerman on 11/12/11.
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// Copyright 2011 Vadovas. All rights reserved.
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//
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#ifndef AwesomeAttractorND_ImageFormatPNG_hpp
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#define AwesomeAttractorND_ImageFormatPNG_hpp
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#include <stdio.h>
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#include <stdexcept>
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#include <png.h>
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namespace ImageFormats {
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namespace png{
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struct pixelRGB {
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pixelRGB()
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: red(0)
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, green(0)
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, blue(0)
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{}
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pixelRGB(double red, double green, double blue)
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: red(clamp(255*red))
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, green(clamp(255*green))
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, blue(clamp(255*blue))
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{}
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pixelRGB(int red, int green, int blue)
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: red(clamp(red))
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, green(clamp(green))
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, blue(clamp(blue))
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{}
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private:
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uint8_t clamp(int n){
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return std::min(255, std::max(0, n));
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}
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uint8_t red;
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uint8_t green;
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uint8_t blue;
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};
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struct png_stream{
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typedef pixelRGB pixel;
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png_stream(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, 8, PNG_COLOR_TYPE_RGB, 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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~png_stream(){
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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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png_stream& 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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}
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}
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#endif
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