VIDEO: Add support for dithering in QuickTime videos

2 files changed, 25 insertions, 0 deletions

diff --git a/video/qt_decoder.cpp b/video/qt_decoder.cpp
index 9b77ef70c1..cab7372a6d 100644
--- a/video/qt_decoder.cpp
+++ b/video/qt_decoder.cpp
@@ -751,4 +751,27 @@ bool QuickTimeDecoder::VideoTrackHandler::endOfCurEdit() const {
 	return getRateAdjustedFrameTime() >= getCurEditTimeOffset() + getCurEditTrackDuration();
 }
 
+bool QuickTimeDecoder::VideoTrackHandler::canDither() const {
+	for (uint i = 0; i < _parent->sampleDescs.size(); i++) {
+		VideoSampleDesc *desc = (VideoSampleDesc *)_parent->sampleDescs[i];
+
+		if (!desc || !desc->_videoCodec)
+			return false;
+
+		if (!desc->_videoCodec->canDither(Image::Codec::kDitherTypeQT))
+			return false;
+	}
+
+	return true;
+}
+
+void QuickTimeDecoder::VideoTrackHandler::setDither(const byte *palette) {
+	assert(canDither());
+
+	for (uint i = 0; i < _parent->sampleDescs.size(); i++) {
+		VideoSampleDesc *desc = (VideoSampleDesc *)_parent->sampleDescs[i];
+		desc->_videoCodec->setDither(Image::Codec::kDitherTypeQT, palette);
+	}
+}
+
 } // End of namespace Video
diff --git a/video/qt_decoder.h b/video/qt_decoder.h
index 99ac9ff5f7..99980a303d 100644
--- a/video/qt_decoder.h
+++ b/video/qt_decoder.h
@@ -140,6 +140,8 @@ private:
 		bool hasDirtyPalette() const { return _curPalette; }
 		bool setReverse(bool reverse);
 		bool isReversed() const { return _reversed; }
+		bool canDither() const;
+		void setDither(const byte *palette);
 
 		Common::Rational getScaledWidth() const;
 		Common::Rational getScaledHeight() const;