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engines/ultima/ultima4/gfx/imageloader_u4.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 ULTIMA4_GFX_IMAGELOADER_U4_H
+#define ULTIMA4_GFX_IMAGELOADER_U4_H
+
+#include "ultima/ultima4/gfx/imageloader.h"
+
+namespace Ultima {
+namespace Ultima4 {
+
+/**
+ * Decoder for U4 raw images.  Raw images are just an uncompressed
+ * stream of pixel data with no palette information (e.g. shapes.ega,
+ * charset.ega).  This decoder handles the original 4-bit images, as
+ * well as the 8-bit VGA upgrade images.
+ */
+class U4RawImageDecoder : public U4ImageDecoder {
+public:
+	U4RawImageDecoder(int width, int height, int bpp)
+	  : U4ImageDecoder(width, height, bpp) {}
+
+	bool loadStream(Common::SeekableReadStream &stream) override;
+};
+
+/**
+ * Decoder for U4 images with RLE compression.  Like raw images, the
+ * data is just a stream of pixel data with no palette information
+ * (e.g. start.ega, rune_*.ega).  This decoder handles the original
+ * 4-bit images, as well as the 8-bit VGA upgrade images.
+ */
+class U4RleImageDecoder : public U4ImageDecoder {
+public:
+	U4RleImageDecoder(int width, int height, int bpp)
+	  : U4ImageDecoder(width, height, bpp) {}
+
+	bool loadStream(Common::SeekableReadStream &stream) override;
+};
+
+/**
+ * Decoder for U4 images with LZW compression.  Like raw images, the
+ * data is just a stream of pixel data with no palette information
+ * (e.g. title.ega, tree.ega).  This decoder handles the original 4-bit
+ * images, as well as the 8-bit VGA upgrade images.
+ */
+class U4LzwImageDecoder : public U4ImageDecoder {
+public:
+	U4LzwImageDecoder(int width, int height, int bpp)
+	  : U4ImageDecoder(width, height, bpp) {}
+
+	bool loadStream(Common::SeekableReadStream &stream) override;
+};
+
+class U4PaletteLoader {
+	static const byte _bwPalette[2 * 3];
+	static byte *_egaPalette;
+	static byte *_vgaPalette;
+
+public:
+	const byte *loadBWPalette();
+	const byte *loadEgaPalette();
+	const byte *loadVgaPalette();
+};
+
+} // End of namespace Ultima4
+} // End of namespace Ultima
+
+#endif