1 files changed, 109 insertions, 0 deletions
diff --git a/base/gfx/vector_canvas.cc b/base/gfx/vector_canvas.cc
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+++ b/base/gfx/vector_canvas.cc
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+// Copyright 2008, 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
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// 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 "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) {
+  initialize(dc, width, height);
+}
+
+VectorCanvas::~VectorCanvas() {
+}
+
+void VectorCanvas::initialize(HDC context, int width, int height) {
+  SkDevice* device = createPlatformDevice(width, height, true, context);
+  setDevice(device);
+  device->unref();  // was created with refcount 1, and setDevice also refs
+}
+
+SkBounder* VectorCanvas::setBounder(SkBounder* bounder) {
+  if (!IsTopDeviceVectorial())
+    return PlatformCanvas::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
+    // BitmapPlatformDevice 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 PlatformCanvas::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);
+  PlatformDevice* device = VectorDevice::create(
+      reinterpret_cast<HDC>(shared_section), width, height);
+  return device;
+}
+
+bool VectorCanvas::IsTopDeviceVectorial() const {
+  return getTopPlatformDevice().IsVectorial();
+}
+
+}  // namespace gfx