コード例 #1
0
ファイル: ImageFormat_JPEG.cpp プロジェクト: Siv3D/OpenSiv3D
	Image ImageFormat_JPEG::decode(IReader& reader) const
	{
		const int64 size = reader.size();
		
		uint8* buffer = static_cast<uint8*>(::malloc(static_cast<size_t>(size)));
		
		reader.read(buffer, size);

		int width, height;

		tjhandle tj = ::tjInitDecompress();

		::tjDecompressHeader(tj, buffer, static_cast<unsigned long>(size), &width, &height);

		Image image(width, height);

		::tjDecompress(
			tj,
			buffer,
			static_cast<unsigned long>(size),
			image.dataAsUint8(),
			image.width(),
			image.stride(),
			image.height(),
			sizeof(Color),
			0);

		::tjDestroy(tj);

		::free(buffer);

		return image;
	}
コード例 #2
0
ファイル: ImageFormat_JPEG.cpp プロジェクト: Siv3D/OpenSiv3D
	Size ImageFormat_JPEG::getSize(const IReader& reader) const
	{
		uint8 buf[24];

		if (!reader.lookahead(buf))
		{
			return{ 0, 0 };
		}

		const auto len = reader.size();

		//
		//	http://www.wischik.com/lu/programmer/get-image-size.html
		//
		if ((buf[0] == 0xFF && buf[1] == 0xD8 && buf[2] == 0xFF && buf[3] == 0xE0 && buf[6] == 'J' && buf[7] == 'F' && buf[8] == 'I' && buf[9] == 'F')
			|| (buf[0] == 0xFF && buf[1] == 0xD8 && buf[2] == 0xFF && buf[3] == 0xE1 && buf[6] == 'E' && buf[7] == 'x' && buf[8] == 'i' && buf[9] == 'f'))
		{
			int64 pos = 2;

			while (buf[2] == 0xFF)
			{
				if (buf[3] == 0xC0
					|| buf[3] == 0xC1
					|| buf[3] == 0xC2
					|| buf[3] == 0xC3
					|| buf[3] == 0xC5
					|| buf[3] == 0xC6
					|| buf[3] == 0xC7
					|| buf[3] == 0xC9
					|| buf[3] == 0xCA
					|| buf[3] == 0xCB
					|| buf[3] == 0xCD
					|| buf[3] == 0xCE
					|| buf[3] == 0xCF)
				{
					break;
				}

				pos += 2 + (buf[4] << 8) + buf[5];

				if (pos + 12 > len)
				{
					break;
				}

				reader.lookahead(buf + 2, pos, 12);
			}
		}

		// JPEG: (first two bytes of buf are first two bytes of the jpeg file; rest of buf is the DCT frame
		if (buf[0] == 0xFF && buf[1] == 0xD8 && buf[2] == 0xFF)
		{
			const int32 width = (buf[9] << 8) + buf[10];
			const int32 height = (buf[7] << 8) + buf[8];

			return{ width, height };
		}

		return{ 0, 0 };
	}
コード例 #3
0
ファイル: CAudioFormat.cpp プロジェクト: Siv3D/OpenSiv3D
			TemporaryFile(const IReader& reader)
				: m_path(FileSystem::UniqueFilePath())
			{
				WritableMemoryMapping file(m_path);

				const size_t size = static_cast<size_t>(reader.size());

				file.map(0, size);

				reader.lookahead(file.data(), size);

				file.unmap();
			}