Initial commit

engines/glk/raw_decoder.cpp

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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/>.
+ *
+ */
+
+#include "glk/raw_decoder.h"
+#include "common/stream.h"
+#include "common/textconsole.h"
+
+namespace Glk {
+
+RawDecoder::RawDecoder() : Image::ImageDecoder(), _palette(0),
+	_transColor(0) {
+}
+
+RawDecoder::~RawDecoder() {
+	destroy();
+}
+
+void RawDecoder::destroy() {
+	_surface.free();
+	_palette.clear();
+}
+
+bool RawDecoder::loadStream(Common::SeekableReadStream &stream) {
+	// Reset member variables from previous decodings
+	destroy();
+
+	uint width = stream.readUint16LE();
+	uint height = stream.readUint16LE();
+	uint paletteColorCount = stream.readUint16LE();
+	assert(paletteColorCount == 0 || paletteColorCount <= 0x100);
+
+	if (paletteColorCount != 0) {
+		// Read in the palette
+		_palette.resize(paletteColorCount, false);
+		for (uint16 i = 0; i < paletteColorCount; i++) {
+			byte r = stream.readByte();
+			byte g = stream.readByte();
+			byte b = stream.readByte();
+			_palette.set(i, r, g, b);
+		}
+
+		// Get the transparent color
+		byte transColor = stream.readByte();
+		if (transColor < paletteColorCount)
+			_transColor = transColor;
+	} else {
+		_transColor = 0;
+	}
+
+	// Set up the surface
+	_surface.create(width, height, (paletteColorCount == 0) ?
+	    Graphics::PixelFormat(4, 8, 8, 8, 8, 24, 16, 8, 0) :
+		Graphics::PixelFormat::createFormatCLUT8());
+
+	assert((stream.size() - stream.pos()) ==
+		(int)(width * height * _surface.format.bytesPerPixel));
+	byte *pixels = (byte *)_surface.getPixels();
+	stream.read(pixels, width * height * _surface.format.bytesPerPixel);
+
+	if (paletteColorCount > 0) {
+		for (uint idx = 0; idx < width * height; ++idx, ++pixels) {
+			assert(*pixels != 0xff);
+			if (*pixels >= paletteColorCount)
+				*pixels = paletteColorCount - 1;
+		}
+	}
+
+	return true;
+}
+
+} // End of namespace Glk