1 files changed, 90 insertions, 0 deletions
diff --git a/skia/ext/vector_canvas.cc b/skia/ext/vector_canvas.cc
new file mode 100644
index 0000000..440ee64
--- /dev/null
+++ b/skia/ext/vector_canvas.cc
@@ -0,0 +1,90 @@
+// Copyright (c) 2006-2008 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 "base/gfx/vector_canvas.h"
+
+#include "base/gfx/vector_device.h"
+#include "base/logging.h"
+
+namespace gfx {
+
+VectorCanvas::VectorCanvas() {
+}
+
+VectorCanvas::VectorCanvas(HDC dc, int width, int height) {
+  bool initialized = initialize(dc, width, height);
+  CHECK(initialized);
+}
+
+VectorCanvas::~VectorCanvas() {
+}
+
+bool VectorCanvas::initialize(HDC context, int width, int height) {
+  SkDevice* device = createPlatformDevice(width, height, true, context);
+  if (!device)
+    return false;
+
+  setDevice(device);
+  device->unref();  // was created with refcount 1, and setDevice also refs
+  return true;
+}
+
+SkBounder* VectorCanvas::setBounder(SkBounder* bounder) {
+  if (!IsTopDeviceVectorial())
+    return PlatformCanvasWin::setBounder(bounder);
+
+  // This function isn't used in the code. Verify this assumption.
+  NOTREACHED();
+  return NULL;
+}
+
+SkDevice* VectorCanvas::createDevice(SkBitmap::Config config,
+                                     int width, int height,
+                                     bool is_opaque, bool isForLayer) {
+  DCHECK(config == SkBitmap::kARGB_8888_Config);
+  return createPlatformDevice(width, height, is_opaque, NULL);
+}
+
+SkDrawFilter* VectorCanvas::setDrawFilter(SkDrawFilter* filter) {
+  // This function isn't used in the code. Verify this assumption.
+  NOTREACHED();
+  return NULL;
+}
+
+SkDevice* VectorCanvas::createPlatformDevice(int width,
+                                             int height, bool is_opaque,
+                                             HANDLE shared_section) {
+  if (!is_opaque) {
+    // TODO(maruel):  http://b/1184002 1184002 When restoring a semi-transparent
+    // layer, i.e. merging it, we need to rasterize it because GDI doesn't
+    // support transparency except for AlphaBlend(). Right now, a
+    // BitmapPlatformDeviceWin is created when VectorCanvas think a saveLayers()
+    // call is being done. The way to save a layer would be to create an
+    // EMF-based VectorDevice and have this device registers the drawing. When
+    // playing back the device into a bitmap, do it at the printer's dpi instead
+    // of the layout's dpi (which is much lower).
+    return PlatformCanvasWin::createPlatformDevice(width, height, is_opaque,
+                                                shared_section);
+  }
+
+  // TODO(maruel):  http://b/1183870 Look if it would be worth to increase the
+  // resolution by ~10x (any worthy factor) to increase the rendering precision
+  // (think about printing) while using a relatively low dpi. This happens
+  // because we receive float as input but the GDI functions works with
+  // integers. The idea is to premultiply the matrix with this factor and
+  // multiply each SkScalar that are passed to SkScalarRound(value) as
+  // SkScalarRound(value * 10). Safari is already doing the same for text
+  // rendering.
+  DCHECK(shared_section);
+  PlatformDeviceWin* device = VectorDevice::create(
+      reinterpret_cast<HDC>(shared_section), width, height);
+  return device;
+}
+
+bool VectorCanvas::IsTopDeviceVectorial() const {
+  return getTopPlatformDevice().IsVectorial();
+}
+
+}  // namespace gfx
+