[SVG] DisplayList-based patterns.

Source/platform/graphics/Pattern.cpp

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Computer, Inc.  All rights reserved.
  * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
  * 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 13 matching lines @@
  * (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 "platform/graphics/Pattern.h"
 
 #include <v8.h>
 #include "SkCanvas.h"
 #include "SkColorShader.h"
+#include "SkShader.h"
+#include "platform/graphics/DisplayList.h"
+#include "platform/graphics/Image.h"
 #include "platform/graphics/skia/SkiaUtils.h"
 
 
 namespace blink {
 
 PassRefPtr<Pattern> Pattern::createBitmapPattern(PassRefPtr<Image> tileImage, RepeatMode repeatMode)
 {
     return adoptRef(new Pattern(tileImage, repeatMode));
 }
 
+PassRefPtr<Pattern> Pattern::createDisplayListPattern(PassRefPtr<DisplayList> displayList,
+    RepeatMode repeatMode)
+{
+    return adoptRef(new Pattern(displayList, repeatMode));
+}
+
 Pattern::Pattern(PassRefPtr<Image> image, RepeatMode repeatMode)
     : m_repeatMode(repeatMode)
     , m_externalMemoryAllocated(0)
 {
     if (image) {
         m_tileImage = image->nativeImageForCurrentFrame();
     }
 }
 
+Pattern::Pattern(PassRefPtr<DisplayList> displayList, RepeatMode repeatMode)
+    : m_tileDisplayList(displayList)
+    , m_repeatMode(repeatMode)
+    , m_externalMemoryAllocated(0)
+{
+}
+
 Pattern::~Pattern()
 {
+    ASSERT(!m_tileImage || !m_tileDisplayList);
+
     if (m_externalMemoryAllocated)
         v8::Isolate::GetCurrent()->AdjustAmountOfExternalAllocatedMemory(-m_externalMemoryAllocated);
 }
 
 SkShader* Pattern::shader()
 {
     if (m_pattern)
         return m_pattern.get();
 
     SkMatrix localMatrix = affineTransformToSkMatrix(m_patternSpaceTransformation);
 
-    // If we don't have a bitmap, return a transparent shader.
+    // FIXME: convert all clients to DisplayList and drop the Image tile code.
     if (!m_tileImage) {
-        m_pattern = adoptRef(new SkColorShader(SK_ColorTRANSPARENT));
+        if (m_tileDisplayList) {
+            // All current display list clients use RepeatModeXY, so we only support this mode.
+            ASSERT(m_repeatMode == RepeatModeXY);
+
+            SkRect tileBounds = SkRect::MakeWH(m_tileDisplayList->bounds().width(),
+                m_tileDisplayList->bounds().height());
+            m_pattern = adoptRef(SkShader::CreatePictureShader(m_tileDisplayList->picture(),
+                SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode, &localMatrix, &tileBounds));
+        } else {
+            m_pattern = adoptRef(new SkColorShader(SK_ColorTRANSPARENT));
+        }
     } else if (m_repeatMode == RepeatModeXY) {
-        m_pattern = adoptRef(SkShader::CreateBitmapShader(m_tileImage->bitmap(),
-            SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode, &localMatrix));
+        m_pattern = adoptRef(SkShader::CreateBitmapShader(m_tileImage->bitmap(), SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode, &localMatrix));
     } else {
         // Skia does not have a "draw the tile only once" option. Clamp_TileMode
         // repeats the last line of the image after drawing one tile. To avoid
         // filling the space with arbitrary pixels, this workaround forces the
         // image to have a line of transparent pixels on the "repeated" edge(s),
         // thus causing extra space to be transparent filled.
         SkShader::TileMode tileModeX = (m_repeatMode & RepeatModeX)
             ? SkShader::kRepeat_TileMode
             : SkShader::kClamp_TileMode;
         SkShader::TileMode tileModeY = (m_repeatMode & RepeatModeY)
@@ skipping 29 matching lines @@
 void Pattern::setPatternSpaceTransform(const AffineTransform& patternSpaceTransformation)
 {
     if (patternSpaceTransformation == m_patternSpaceTransformation)
         return;
 
     m_patternSpaceTransformation = patternSpaceTransformation;
     m_pattern.clear();
 }
 
 }