Function BmpRead1

src/bmp.cpp:21–39

* Reads a 1 bpp uncompressed bitmap * The bitmap is converted to a 8 bpp bitmap */

 * The bitmap is converted to a 8 bpp bitmap
 */
static inline bool BmpRead1(RandomAccessFile &file, BmpInfo &info, BmpData &data)
{
	uint8_t pad = GB(4 - info.width / 8, 0, 2);
	for (uint y = info.height; y > 0; y--) {
		uint x = 0;
		uint8_t *pixel_row = &data.bitmap[(y - 1) * static_cast<size_t>(info.width)];
		while (x < info.width) {
			if (file.AtEndOfFile()) return false; // the file is shorter than expected
			uint8_t b = file.ReadByte();
			for (uint i = 8; i > 0; i--) {
				if (x < info.width) *pixel_row++ = GB(b, i - 1, 1);
				x++;
			}
		}
		/* Padding for 32 bit align */
		file.SkipBytes(pad);
	}
	return true;
}

/**
 * Reads a 4 bpp uncompressed bitmap