Use newImageSnapshot() to get an image from a Canvas

Source/platform/graphics/StaticBitmapPattern.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 "config.h"
+#include "platform/graphics/StaticBitmapPattern.h"
+
+#include "platform/graphics/skia/SkiaUtils.h"
+#include "third_party/skia/include/core/SkCanvas.h"
+#include "third_party/skia/include/core/SkColorShader.h"
+#include "third_party/skia/include/core/SkImage.h"
+#include <v8.h>
+
+namespace blink {
+
+PassRefPtr<Pattern> StaticBitmapPattern::create(PassRefPtr<Image> tileImage, RepeatMode repeatMode)
+{
+    return adoptRef(new StaticBitmapPattern(tileImage->image(), repeatMode));
+}
+
+StaticBitmapPattern::StaticBitmapPattern(PassRefPtr<SkImage> image, RepeatMode repeatMode)
+: BitmapPatternBase(repeatMode, 0)
+{
+    if (image) {
+        m_tileImage = image;
+        adjustExternalMemoryAllocated(m_tileImage->width() * m_tileImage->height() * 4);
+    }
+}
+
+StaticBitmapPattern::~StaticBitmapPattern() { }
+
+PassRefPtr<SkShader> StaticBitmapPattern::createShader()
+{
+    // If we have no image, return null
+    if (!m_tileImage) {
+        return adoptRef(new SkColorShader(SK_ColorTRANSPARENT));
+    }
+
+    SkMatrix localMatrix = affineTransformToSkMatrix(m_patternSpaceTransformation);
+
+    if (isRepeatXY()) {
+        return adoptRef(m_tileImage->newShader(SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode, &localMatrix));
+    }
+
+    return BitmapPatternBase::createShader();
+}
+
+SkImageInfo StaticBitmapPattern::getBitmapInfo()
+{
+    return SkImageInfo::MakeN32Premul(m_tileImage->width(), m_tileImage->height());
+}
+
+void StaticBitmapPattern::drawBitmapToCanvas(SkCanvas& canvas, SkPaint& paint)
+{
+    canvas.drawImage(m_tileImage.get(), SkIntToScalar(0), SkIntToScalar(0), &paint);
+}
+
+} // namespace