Function ConvertIA4

Source/HLEGraphics/ConvertTile.cpp:424–471

}

static void ConvertIA4(const TileDestInfo & dsti, const TextureInfo & ti)
{
	u32 width {dsti.Width};
	u32 height {dsti.Height};

	u32 * dst {static_cast<u32*>(dsti.Data)};
	u32 dst_row_stride {dsti.Pitch / sizeof(u32)};
	u32 dst_row_offset {};

	const u8 * src     {gTMEM};
	u32 src_row_stride {ti.GetLine()<<3};
	u32 src_row_offset {ti.GetTmemAddress()<<3};

	u32 row_swizzle {};
	for (u32 y {}; y < height; ++y)
	{
		u32 src_offset {src_row_offset};
		u32 dst_offset {dst_row_offset};

		// Process 2 pixels at a time
		for (u32 x {}; x+1 < width; x += 2)
		{
			u8 src_pixel {src[src_offset^row_swizzle]};

			dst[dst_offset+0] = IA4(src_pixel>>4);
			dst[dst_offset+1] = IA4((src_pixel&0xf));

			src_offset += 1;
			dst_offset += 2;
		}

		// Handle trailing pixel, if odd width
		if (width&1)
		{
			u8 src_pixel {src[src_offset^row_swizzle]};

			dst[dst_offset+0] = IA4(src_pixel>>4);

			src_offset += 1;
			dst_offset += 1;
		}

	  src_row_offset += src_row_stride;
	  dst_row_offset += dst_row_stride;

	  row_swizzle ^= 0x4;   // Alternate lines are word-swapped
	}
}

static void ConvertI8(const TileDestInfo & dsti, const TextureInfo & ti)
{