tile.cpp

#include "tile.h"

#include "common.h"

namespace libsonassmd {

void Tile::fromBinaryStream(std::istream &stream)
{
	stream.clear();
	const auto original_exceptions = stream.exceptions();
	stream.exceptions(stream.badbit | stream.eofbit | stream.failbit);

	for (unsigned int y = 0; y < height; ++y)
	{
		for (unsigned int x = 0; x < width; x += 2)
		{
			const unsigned char byte = ReadU8(stream);

			pixels[y][x + 0] = byte >> 4;
			pixels[y][x + 1] = byte & 0xF;
		}
	}

	stream.clear();
	stream.exceptions(original_exceptions);
}

void Tile::toAssemblyStream(std::ostream &stream) const
{
	stream << "\tdc.b ";

	for (unsigned int y = 0; y < height; ++y)
	{
		for (unsigned int x = 0; x < width; x += 2)
		{
			if (x != 0 || y != 0)
				stream << ',';

			stream << '$';

			static const char nibble_to_char[0x10] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
			stream << nibble_to_char[pixels[y][x + 0]];
			stream << nibble_to_char[pixels[y][x + 1]];
		}
	}

	stream << '\n';
}

void Tile::toBinaryStream(std::ostream &stream) const
{
	for (unsigned int y = 0; y < height; ++y)
	{
		for (unsigned int x = 0; x < width; x += 2)
		{
			const unsigned char byte = (pixels[y][x + 0] << 4) | (pixels[y][x + 1] << 0);
			stream << byte;
		}
	}
}

}