1 files changed, 87 insertions, 0 deletions
diff --git a/engines/mohawk/jpeg.cpp b/engines/mohawk/jpeg.cpp
new file mode 100644
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+++ b/engines/mohawk/jpeg.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 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.
+ *
+ * $URL$
+ * $Id$
+ *
+ */
+
+#include "common/system.h"
+#include "graphics/conversion.h" // For YUV2RGB
+
+#include "mohawk/jpeg.h"
+
+namespace Mohawk {
+
+JPEGDecoder::JPEGDecoder(bool freeSurfaceAfterUse) : Graphics::Codec(), _freeSurfaceAfterUse(freeSurfaceAfterUse) {
+	_jpeg = new Graphics::JPEG();
+	_pixelFormat = g_system->getScreenFormat();
+	_surface = NULL;
+}
+
+JPEGDecoder::~JPEGDecoder() {
+	delete _jpeg;
+
+	if (_surface) {
+		_surface->free();
+		delete _surface;
+	}
+}
+
+Graphics::Surface *JPEGDecoder::decodeImage(Common::SeekableReadStream* stream) {
+	_jpeg->read(stream);
+	Graphics::Surface *ySurface = _jpeg->getComponent(1);
+	Graphics::Surface *uSurface = _jpeg->getComponent(2);
+	Graphics::Surface *vSurface = _jpeg->getComponent(3);
+
+	Graphics::Surface *destSurface = NULL;
+
+	// If we should free the surface after use, use the internal _surface storage
+	// (this should be used when using as a Codec, as the Codecs should free their
+	// surfaces when deleting the Codec object). Otherwise, create a new Surface
+	// as the destination.
+	if (_freeSurfaceAfterUse) {
+		if (!_surface) {
+			_surface = new Graphics::Surface();
+			_surface->create(ySurface->w, ySurface->h, _pixelFormat.bytesPerPixel);
+		}
+		destSurface = _surface;
+	} else {
+		destSurface = new Graphics::Surface();
+		destSurface->create(ySurface->w, ySurface->h, _pixelFormat.bytesPerPixel);
+	}
+
+	assert(destSurface);
+
+	for (uint16 i = 0; i < destSurface->h; i++) {
+		for (uint16 j = 0; j < destSurface->w; j++) {
+			byte r = 0, g = 0, b = 0;
+			Graphics::YUV2RGB(*((byte *)ySurface->getBasePtr(j, i)), *((byte *)uSurface->getBasePtr(j, i)), *((byte *)vSurface->getBasePtr(j, i)), r, g, b);
+			if (_pixelFormat.bytesPerPixel == 2)
+				*((uint16 *)destSurface->getBasePtr(j, i)) = _pixelFormat.RGBToColor(r, g, b);
+			else
+				*((uint32 *)destSurface->getBasePtr(j, i)) = _pixelFormat.RGBToColor(r, g, b);
+		}
+	}
+
+	return destSurface;
+}
+
+} // End of namespace Mohawk