portapack-mayhem/firmware/common/png_writer.hpp
2016-11-26 16:50:44 -08:00

65 lines
1.8 KiB
C++

/*
* Copyright (C) 2016 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __PNG_WRITER_H__
#define __PNG_WRITER_H__
#include <cstdint>
#include <cstddef>
#include <string>
#include <array>
#include "ui.hpp"
#include "file.hpp"
#include "crc.hpp"
class PNGWriter {
public:
~PNGWriter();
Optional<File::Error> create(const std::filesystem::path& filename);
void write_scanline(const std::array<ui::ColorRGB888, 240>& scanline);
private:
// TODO: These constants are baked in a few places, do not change blithely.
static constexpr int width { 240 };
static constexpr int height { 320 };
File file { };
int scanline_count { 0 };
CRC<32, true, true> crc { 0x04c11db7, 0xffffffff, 0xffffffff };
Adler32 adler_32 { };
void write_chunk_header(const size_t length, const std::array<uint8_t, 4>& type);
void write_chunk_content(const void* const p, const size_t count);
template<size_t N>
void write_chunk_content(const std::array<uint8_t, N>& data) {
write_chunk_content(data.data(), sizeof(data));
}
void write_chunk_crc();
void write_uint32_be(const uint32_t v);
};
#endif/*__PNG_WRITER_H__*/