1 files changed, 131 insertions, 0 deletions
diff --git a/image/bmp.cpp b/image/bmp.cpp
new file mode 100644
index 0000000000..cdf6e4097d
--- /dev/null
+++ b/image/bmp.cpp
@@ -0,0 +1,131 @@
+/* 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 2
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#include "image/bmp.h"
+
+#include "common/stream.h"
+#include "common/substream.h"
+#include "common/textconsole.h"
+#include "graphics/pixelformat.h"
+#include "graphics/surface.h"
+#include "image/codecs/codec.h"
+
+namespace Image {
+
+BitmapDecoder::BitmapDecoder() {
+	_surface = 0;
+	_palette = 0;
+	_paletteColorCount = 0;
+	_codec = 0;
+}
+
+BitmapDecoder::~BitmapDecoder() {
+	destroy();
+}
+
+void BitmapDecoder::destroy() {
+	_surface = 0;
+
+	delete[] _palette;
+	_palette = 0;
+
+	_paletteColorCount = 0;
+
+	delete _codec;
+	_codec = 0;
+}
+
+bool BitmapDecoder::loadStream(Common::SeekableReadStream &stream) {
+	destroy();
+
+	if (stream.readByte() != 'B')
+		return false;
+
+	if (stream.readByte() != 'M')
+		return false;
+
+	/* uint32 fileSize = */ stream.readUint32LE();
+	/* uint16 res1 = */ stream.readUint16LE();
+	/* uint16 res2 = */ stream.readUint16LE();
+	uint32 imageOffset = stream.readUint32LE();
+
+	uint32 infoSize = stream.readUint32LE();
+	if (infoSize != 40) {
+		warning("Only Windows v3 bitmaps are supported");
+		return false;
+	}
+
+	uint32 width = stream.readUint32LE();
+	int32 height = stream.readSint32LE();
+
+	if (width == 0 || height == 0)
+		return false;
+
+	if (height < 0) {
+		warning("Right-side up bitmaps not supported");
+		return false;
+	}
+
+	/* uint16 planes = */ stream.readUint16LE();
+	uint16 bitsPerPixel = stream.readUint16LE();
+
+	if (bitsPerPixel != 8 && bitsPerPixel != 24 && bitsPerPixel != 32) {
+		warning("%dbpp bitmaps not supported", bitsPerPixel);
+		return false;
+	}
+
+	uint32 compression = stream.readUint32BE();
+	uint32 imageSize = stream.readUint32LE();
+	/* uint32 pixelsPerMeterX = */ stream.readUint32LE();
+	/* uint32 pixelsPerMeterY = */ stream.readUint32LE();
+	_paletteColorCount = stream.readUint32LE();
+	/* uint32 colorsImportant = */ stream.readUint32LE();
+
+	if (bitsPerPixel == 8) {
+		if (_paletteColorCount == 0)
+			_paletteColorCount = 256;
+
+		// Read the palette
+		_palette = new byte[_paletteColorCount * 3];
+		for (uint16 i = 0; i < _paletteColorCount; i++) {
+			_palette[i * 3 + 2] = stream.readByte();
+			_palette[i * 3 + 1] = stream.readByte();
+			_palette[i * 3 + 0] = stream.readByte();
+			stream.readByte();
+		}
+	}
+
+	// Create the codec (it will warn about unhandled compression)
+	_codec = createBitmapCodec(compression, width, height, bitsPerPixel);
+	if (!_codec)
+		return false;
+
+	// Grab the frame data
+	Common::SeekableSubReadStream subStream(&stream, imageOffset, imageOffset + imageSize);
+
+	// We only support raw bitmaps for now
+	_surface = _codec->decodeFrame(subStream);
+
+	return true;
+}
+
+} // End of namespace Image