Function imageDecodeToR8

Source/3rdParty/bimg/src/image.cpp:4514–4537

	}

	void imageDecodeToR8(bx::AllocatorI* _allocator, void* _dst, const void* _src, uint32_t _width, uint32_t _height, uint32_t _depth, uint32_t _dstPitch, TextureFormat::Enum _srcFormat)
	{
		const uint8_t* src = (const uint8_t*)_src;
		uint8_t* dst = (uint8_t*)_dst;

		const uint32_t srcBpp = s_imageBlockInfo[_srcFormat].bitsPerPixel;
		const uint32_t srcPitch = _width*srcBpp/8;

		for (uint32_t zz = 0; zz < _depth; ++zz, src += _height*srcPitch, dst += _height*_dstPitch)
		{
			if (isCompressed(_srcFormat))
			{
				uint32_t size = imageGetSize(NULL, uint16_t(_width), uint16_t(_height), 0, false, false, 1, TextureFormat::RGBA8);
				void* temp = bx::alloc(_allocator, size);
				imageDecodeToRgba8(_allocator, temp, _src, _width, _height, _width*4, _srcFormat);
				imageConvert(_allocator, dst, TextureFormat::R8, temp, TextureFormat::RGBA8, _width, _height, 1, _width*4, _dstPitch);
				bx::free(_allocator, temp);
			}
			else
			{
				imageConvert(_allocator, dst, TextureFormat::R8, src, _srcFormat, _width, _height, 1, srcPitch, _dstPitch);
			}
		}
	}

	void imageDecodeToBgra8(bx::AllocatorI* _allocator, void* _dst, const void* _src, uint32_t _width, uint32_t _height, uint32_t _dstPitch, TextureFormat::Enum _srcFormat)
	{