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engines/stark/formats/dds.h

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef STARK_FORMATS_DDS_H
+#define STARK_FORMATS_DDS_H
+
+#include "common/array.h"
+#include "common/stream.h"
+#include "graphics/surface.h"
+
+namespace Stark {
+namespace Formats {
+
+// Based on xoreos' DDS code
+
+/**
+ * DDS texture
+ *
+ * Only a very small subset of DDS features are supported. Especially,
+ * compressed formats are not supported. This class is meant to
+ * load a single DDS file per instance.
+ */
+class DDS {
+public:
+	~DDS();
+
+	typedef Common::Array<Graphics::Surface> MipMaps;
+
+	/** Load a DDS texture from a stream */
+	bool load(Common::SeekableReadStream &dds, const Common::String &name);
+
+	/**
+	 * Retrieve the mip map levels for a loaded texture
+	 *
+	 * The first mipmap is the full size image. Each further
+	 * mipmap divides by two the with and the height of the
+	 * previous one.
+	 */
+	const MipMaps &getMipMaps() const;
+
+private:
+	/** The specific pixel format of the included image data. */
+	struct DDSPixelFormat {
+		/** The size of the image data in bytes */
+		uint32 size;
+
+		/** Features of the image data */
+		uint32 flags;
+
+		/** The FourCC to detect the format by */
+		uint32 fourCC;
+
+		/** Number of bits per pixel */
+		uint32 bitCount;
+
+		/** Bit mask for the red color component */
+		uint32 rBitMask;
+
+		/** Bit mask for the green color component */
+		uint32 gBitMask;
+
+		/** Bit mask for the blue color component */
+		uint32 bBitMask;
+
+		/** Bit mask for the alpha component */
+		uint32 aBitMask;
+	};
+
+	bool readHeader(Common::SeekableReadStream &dds);
+	bool readData(Common::SeekableReadStream &dds);
+
+	bool detectFormat(const DDSPixelFormat &format);
+
+	MipMaps _mipmaps;
+	Graphics::PixelFormat _format;
+	Common::String _name;
+};
+
+} // End of namespace Formats
+} // End of namespace Stark
+
+#endif // STARK_FORMATS_DDS_H