Revamp filter primitive region calculations for Filter Effects

third_party/WebKit/Source/core/paint/FilterPainter.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/paint/FilterPainter.h"
 
 #include "core/paint/FilterEffectBuilder.h"
 #include "core/paint/LayerClipRecorder.h"
 #include "core/paint/PaintLayer.h"
 #include "platform/RuntimeEnabledFeatures.h"
@@ skipping 16 matching lines @@
 {
     if (!layer.paintsWithFilters())
         return;
 
     FilterEffect* lastEffect = layer.lastFilterEffect();
     if (!lastEffect)
         return;
 
     DCHECK(layer.filterInfo());
 
-    lastEffect->determineFilterPrimitiveSubregion(MapRectForward);
+    lastEffect->determineMaximumEffectRect(MapRectForward);
     sk_sp<SkImageFilter> imageFilter = SkiaImageFilterBuilder::build(lastEffect, ColorSpaceDeviceRGB);
     if (!imageFilter)
         return;
 
     // We'll handle clipping to the dirty rect before filter rasterization.
     // Filter processing will automatically expand the clip rect and the offscreen to accommodate any filter outsets.
     // FIXME: It is incorrect to just clip to the damageRect here once multiple fragments are involved.
 
     // Subsequent code should not clip to the dirty rect, since we've already
     // done it above, and doing it later will defeat the outsets.
@@ skipping 29 matching lines @@
 
 FilterPainter::~FilterPainter()
 {
     if (!m_filterInProgress)
         return;
 
     m_context.getPaintController().endItem<EndFilterDisplayItem>(*m_layoutObject);
 }
 
 } // namespace blink