IMAGE: Split raw bitmap decoding into a Codec

2014-02-27 21:27:24 -05:00 · 2014-02-27 21:27:24 -05:00 · 0f07f85a94
commit 0f07f85a94
parent 08ea14a8d0
5 changed files with 186 additions and 67 deletions
--- a/image/codecs/bmp_raw.cpp
+++ b/image/codecs/bmp_raw.cpp
@ -0,0 +1,113 @@
+/* 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/codecs/bmp_raw.h"
+
+#include "common/stream.h"
+#include "common/textconsole.h"
+#include "graphics/surface.h"
+
+namespace Image {
+
+BitmapRawDecoder::BitmapRawDecoder(int width, int height, int bitsPerPixel) : Codec(),
+		_surface(0), _width(width), _height(height), _bitsPerPixel(bitsPerPixel) {
+}
+
+BitmapRawDecoder::~BitmapRawDecoder() {
+	if (_surface) {
+		_surface->free();
+		delete _surface;
+	}
+}
+
+const Graphics::Surface *BitmapRawDecoder::decodeFrame(Common::SeekableReadStream &stream) {
+	Graphics::PixelFormat format = getPixelFormat();
+
+	_surface = new Graphics::Surface();
+	_surface->create(_width, _height, format);
+
+	int srcPitch = _width * (_bitsPerPixel >> 3);
+	const int extraDataLength = (srcPitch % 4) ? 4 - (srcPitch % 4) : 0;
+
+	if (_bitsPerPixel == 8) {
+		byte *dst = (byte *)_surface->getPixels();
+
+		for (int i = 0; i < _height; i++) {
+			stream.read(dst + (_height - i - 1) * _width, _width);
+			stream.skip(extraDataLength);
+		}
+	} else if (_bitsPerPixel == 24) {
+		byte *dst = (byte *)_surface->getBasePtr(0, _height - 1);
+
+		for (int i = 0; i < _height; i++) {
+			for (int j = 0; j < _width; j++) {
+				byte b = stream.readByte();
+				byte g = stream.readByte();
+				byte r = stream.readByte();
+				uint32 color = format.RGBToColor(r, g, b);
+
+				*((uint32 *)dst) = color;
+				dst += format.bytesPerPixel;
+			}
+
+			stream.skip(extraDataLength);
+			dst -= _surface->pitch * 2;
+		}
+	} else { // 32 bpp
+		byte *dst = (byte *)_surface->getBasePtr(0, _height - 1);
+
+		for (int i = 0; i < _height; i++) {
+			for (int j = 0; j < _width; j++) {
+				byte b = stream.readByte();
+				byte g = stream.readByte();
+				byte r = stream.readByte();
+				// Ignore the last byte, as in v3 it is unused
+				// and should thus NOT be used as alpha.
+				// ref: http://msdn.microsoft.com/en-us/library/windows/desktop/dd183376%28v=vs.85%29.aspx
+				stream.readByte();
+				uint32 color = format.RGBToColor(r, g, b);
+
+				*((uint32 *)dst) = color;
+				dst += format.bytesPerPixel;
+			}
+
+			stream.skip(extraDataLength);
+			dst -= _surface->pitch * 2;
+		}
+	}
+
+	return _surface;
+}
+
+Graphics::PixelFormat BitmapRawDecoder::getPixelFormat() const {
+	switch (_bitsPerPixel) {
+	case 8:
+		return Graphics::PixelFormat::createFormatCLUT8();
+	case 24:
+	case 32:
+		return Graphics::PixelFormat(4, 8, 8, 8, 8, 8, 16, 24, 0);
+	}
+
+	error("Unhandled BMP raw %dbpp", _bitsPerPixel);
+}
+
+} // End of namespace Image