blink: Add backdrop-filter support

Source/modules/canvas2d/CanvasRenderingContext2D.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2007 Alp Toker <alp@atoker.com>
  * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008 Dirk Schulze <krit@webkit.org>
  * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
  * Copyright (C) 2012, 2013 Intel Corporation. All rights reserved.
  * Copyright (C) 2013 Adobe Systems Incorporated. All rights reserved.
  *
@@ skipping 645 matching lines @@
 
     RefPtrWillBeRawPtr<CSSValue> filterValue = CSSParser::parseSingleValue(CSSPropertyWebkitFilter, filterString, CSSParserContext(HTMLStandardMode, 0));
 
     if (!filterValue || filterValue->isInitialValue() || filterValue->isInheritedValue())
         return;
 
     modifiableState().setUnparsedFilter(filterString);
     modifiableState().setFilter(filterValue.release());
 }
 
+String CanvasRenderingContext2D::backdropFilter() const
+{
+    return state().unparsedBackdropFilter();
+}
+
+void CanvasRenderingContext2D::setBackdropFilter(const String& backdropFilterString)
+{
+    if (backdropFilterString == state().unparsedBackdropFilter())
+        return;
+
+    RefPtrWillBeRawPtr<CSSValue> backdropFilterValue = CSSParser::parseSingleValue(CSSPropertyBackdropFilter, backdropFilterString, CSSParserContext(HTMLStandardMode, 0));
+
+    if (!backdropFilterValue || backdropFilterValue->isInitialValue() || backdropFilterValue->isInheritedValue())
+        return;
+
+    modifiableState().setUnparsedBackdropFilter(backdropFilterString);
+    modifiableState().setBackdropFilter(backdropFilterValue.release());
+}
+
 PassRefPtrWillBeRawPtr<SVGMatrixTearOff> CanvasRenderingContext2D::currentTransform() const
 {
     return SVGMatrixTearOff::create(state().transform());
 }
 
 void CanvasRenderingContext2D::setCurrentTransform(PassRefPtrWillBeRawPtr<SVGMatrixTearOff> passMatrixTearOff)
 {
     RefPtrWillBeRawPtr<SVGMatrixTearOff> matrixTearOff = passMatrixTearOff;
     const AffineTransform& transform = matrixTearOff->value();
     setTransform(transform.a(), transform.b(), transform.c(), transform.d(), transform.e(), transform.f());
@@ skipping 1644 matching lines @@
         if (imageType == CanvasRenderingContext2DState::NonOpaqueImage)
             return;
         if (alpha < 0xFF)
             return;
     }
 
     canvas()->buffer()->willOverwriteCanvas();
 }
 
 } // namespace blink