Revert 156733 "Refactoring DrawLooper so that it can apply shado..."

trunk/Source/core/platform/graphics/DrawLooper.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 15 matching lines @@
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "core/platform/graphics/DrawLooper.h"
 
 #include "core/platform/graphics/Color.h"
 #include "core/platform/graphics/FloatSize.h"
-#include "third_party/skia/include/core/SkBitmap.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "third_party/skia/include/core/SkColorFilter.h"
 #include "third_party/skia/include/core/SkDrawLooper.h"
 #include "third_party/skia/include/core/SkPaint.h"
 #include "third_party/skia/include/core/SkXfermode.h"
 #include "third_party/skia/include/effects/SkBlurMaskFilter.h"
-#include "third_party/skia/include/effects/SkDropShadowImageFilter.h"
 #include "third_party/skia/include/effects/SkLayerDrawLooper.h"
 
 namespace WebCore {
 
-DrawLooper::DrawLooper() { }
+DrawLooper::DrawLooper() : m_skDrawLooper(adoptRef(new SkLayerDrawLooper)) { }
 
 DrawLooper::~DrawLooper() { }
 
 SkDrawLooper* DrawLooper::skDrawLooper() const
 {
-    if (!m_cachedDrawLooper)
-        buildCachedDrawLooper();
-    return m_cachedDrawLooper.get();
-}
-
-SkImageFilter* DrawLooper::imageFilter() const
-{
-    if (!m_cachedImageFilter)
-        buildCachedImageFilter();
-    return m_cachedImageFilter.get();
-}
-
-void DrawLooper::clearCached()
-{
-    m_cachedDrawLooper.clear();
-    m_cachedImageFilter.clear();
+    return m_skDrawLooper.get();
 }
 
 void DrawLooper::addUnmodifiedContent()
 {
-    DrawLooperLayerInfo info;
-    info.m_layerType = UnmodifiedLayer;
-    m_layerInfo.append(info);
-    clearCached();
+    SkLayerDrawLooper::LayerInfo info;
+    m_skDrawLooper->addLayerOnTop(info);
 }
 
 void DrawLooper::addShadow(const FloatSize& offset, float blur, const Color& color,
     ShadowTransformMode shadowTransformMode, ShadowAlphaMode shadowAlphaMode)
 {
     // Detect when there's no effective shadow.
     if (!color.alpha())
         return;
-    DrawLooperLayerInfo info;
-    info.m_layerType = ShadowLayer;
-    info.m_blur = blur;
-    info.m_color = color;
-    info.m_offset = offset;
-    info.m_shadowAlphaMode = shadowAlphaMode;
-    info.m_shadowTransformMode = shadowTransformMode;
-    m_layerInfo.append(info);
-    clearCached();
-};
 
-void DrawLooper::buildCachedDrawLooper() const
-{
-    m_cachedDrawLooper = adoptRef(new SkLayerDrawLooper);
-    LayerVector::const_iterator info;
-    for (info = m_layerInfo.begin(); info < m_layerInfo.end(); ++info) {
-        if (info->m_layerType == ShadowLayer) {
-            SkColor skColor = info->m_color.rgb();
+    SkColor skColor = color.rgb();
 
-            SkLayerDrawLooper::LayerInfo skInfo;
+    SkLayerDrawLooper::LayerInfo info;
 
-            switch (info->m_shadowAlphaMode) {
-            case ShadowRespectsAlpha:
-                skInfo.fColorMode = SkXfermode::kDst_Mode;
-                break;
-            case ShadowIgnoresAlpha:
-                skInfo.fColorMode = SkXfermode::kSrc_Mode;
-                break;
-            default:
-                ASSERT_NOT_REACHED();
-            }
+    switch (shadowAlphaMode) {
+    case ShadowRespectsAlpha:
+        info.fColorMode = SkXfermode::kDst_Mode;
+        break;
+    case ShadowIgnoresAlpha:
+        info.fColorMode = SkXfermode::kSrc_Mode;
+        break;
+    default:
+        ASSERT_NOT_REACHED();
+    }
 
-            if (info->m_blur)
-                skInfo.fPaintBits |= SkLayerDrawLooper::kMaskFilter_Bit; // our blur
-            skInfo.fPaintBits |= SkLayerDrawLooper::kColorFilter_Bit;
-            skInfo.fOffset.set(info->m_offset.width(), info->m_offset.height());
-            skInfo.fPostTranslate = (info->m_shadowTransformMode == ShadowIgnoresTransforms);
+    if (blur)
+        info.fPaintBits |= SkLayerDrawLooper::kMaskFilter_Bit; // our blur
+    info.fPaintBits |= SkLayerDrawLooper::kColorFilter_Bit;
+    info.fOffset.set(offset.width(), offset.height());
+    info.fPostTranslate = (shadowTransformMode == ShadowIgnoresTransforms);
 
-            SkPaint* paint = m_cachedDrawLooper->addLayerOnTop(skInfo);
+    SkPaint* paint = m_skDrawLooper->addLayerOnTop(info);
 
-            if (info->m_blur) {
-                uint32_t mfFlags = SkBlurMaskFilter::kHighQuality_BlurFlag;
-                if (info->m_shadowTransformMode == ShadowIgnoresTransforms)
-                    mfFlags |= SkBlurMaskFilter::kIgnoreTransform_BlurFlag;
-                RefPtr<SkMaskFilter> mf = adoptRef(SkBlurMaskFilter::Create(
-                    (double)info->m_blur / 2.0, SkBlurMaskFilter::kNormal_BlurStyle, mfFlags));
-                paint->setMaskFilter(mf.get());
-            }
+    if (blur) {
+        uint32_t mfFlags = SkBlurMaskFilter::kHighQuality_BlurFlag;
+        if (shadowTransformMode == ShadowIgnoresTransforms)
+            mfFlags |= SkBlurMaskFilter::kIgnoreTransform_BlurFlag;
+        RefPtr<SkMaskFilter> mf = adoptRef(SkBlurMaskFilter::Create(
+            (double)blur / 2.0, SkBlurMaskFilter::kNormal_BlurStyle, mfFlags));
+        paint->setMaskFilter(mf.get());
+    }
 
-            RefPtr<SkColorFilter> cf = adoptRef(SkColorFilter::CreateModeFilter(skColor, SkXfermode::kSrcIn_Mode));
-            paint->setColorFilter(cf.get());
-        } else {
-            // Unmodified layer
-            SkLayerDrawLooper::LayerInfo skInfo;
-            m_cachedDrawLooper->addLayerOnTop(skInfo);
-        }
-    }
-}
-
-void DrawLooper::buildCachedImageFilter() const
-{
-    ASSERT(m_layerInfo.size() == 2);
-    ASSERT(m_layerInfo[0].m_layerType == ShadowLayer);
-    ASSERT(m_layerInfo[1].m_layerType == UnmodifiedLayer);
-    ASSERT(m_layerInfo[0].m_shadowAlphaMode == ShadowRespectsAlpha);
-    ASSERT(m_layerInfo[0].m_shadowTransformMode == ShadowIgnoresTransforms);
-    const float blurToSigmaFactor = 0.25;
-    SkColor skColor = m_layerInfo[0].m_color.rgb();
-    m_cachedImageFilter = adoptRef(new SkDropShadowImageFilter(m_layerInfo[0].m_offset.width(), m_layerInfo[0].m_offset.height(), m_layerInfo[0].m_blur * blurToSigmaFactor, skColor));
-}
-
-bool DrawLooper::shouldUseImageFilterToDrawBitmap(const SkBitmap& bitmap) const
-{
-    if (bitmap.isOpaque() || !m_layerInfo.size())
-        return false;
-
-#if !ASSERT_DISABLED
-    // Verify that cases that require a mask filter to render correctly are of
-    // a form that can be handled by DropShadowImageFilter.
-    LayerVector::const_iterator info;
-    int unmodifiedCount = 0;
-    int shadowCount = 0;
-    bool needsFilter = false;
-    for (info = m_layerInfo.begin(); info < m_layerInfo.end(); ++info) {
-        if (info->m_layerType == ShadowLayer) {
-            needsFilter = needsFilter || (info->m_blur && info->m_shadowAlphaMode == ShadowRespectsAlpha);
-            shadowCount++;
-        } else {
-            unmodifiedCount++;
-        }
-
-    }
-    if (needsFilter) {
-        // If any of the following assertions ever fire, it means that we are hitting
-        // case that may not be rendered correclty by the DrawLooper and cannot be
-        // handled by DropShadowImageFilter.
-        ASSERT(shadowCount == 1);
-        ASSERT(unmodifiedCount == 1);
-        ASSERT(m_layerInfo[0].m_layerType == ShadowLayer);
-        ASSERT(m_layerInfo[0].m_shadowTransformMode == ShadowIgnoresTransforms);
-    }
-#endif
-
-    return m_layerInfo.size() == 2
-        && m_layerInfo[0].m_layerType == ShadowLayer
-        && m_layerInfo[0].m_shadowAlphaMode == ShadowRespectsAlpha
-        && m_layerInfo[0].m_shadowTransformMode == ShadowIgnoresTransforms
-        && m_layerInfo[0].m_blur
-        && m_layerInfo[1].m_layerType == UnmodifiedLayer;
+    RefPtr<SkColorFilter> cf = adoptRef(SkColorFilter::CreateModeFilter(skColor, SkXfermode::kSrcIn_Mode));
+    paint->setColorFilter(cf.get());
 }
 
 } // namespace WebCore