skia::PlatformCanvas is being deprecated. Going forward we will use gfx::Canvas wherever we need ...

ui/gfx/canvas_skia_paint_win.cc

+// Copyright (c) 2011 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 "ui/gfx/canvas_skia_paint_win.h"
+
+#include "base/logging.h"
+#include "ui/gfx/canvas_skia.h"
+#include "ui/gfx/rect.h"
+
+namespace gfx {
+
+CanvasSkiaPaint::CanvasSkiaPaint(gfx::NativeView view) : hwnd_(view) {
+  memset(&ps_, 0, sizeof(ps_));
+
+  paint_dc_ = BeginPaint(hwnd_, &ps_);
+  CHECK(InitCanvas());
+}
+
+CanvasSkiaPaint::~CanvasSkiaPaint() {
+  canvas_->skia_canvas()->restoreToCount(1);
+
+  // Commit the drawing to the screen.
+  Rect rect = GetInvalidRect();
+  canvas_->BlitToNativeContext(
+      gfx::Rect(rect.size()), rect.origin(), paint_dc_);
+
+  EndPaint(hwnd_, &ps_);
+}
+
+bool CanvasSkiaPaint::IsValid() const {
+  return GetInvalidRect().IsEmpty();
+}
+
+gfx::Rect CanvasSkiaPaint::GetInvalidRect() const {
+  return gfx::Rect(ps_.rcPaint);
+}
+
+Canvas* CanvasSkiaPaint::AsCanvas() {
+  return canvas_.get();
+}
+
+bool CanvasSkiaPaint::InitCanvas() {
+  canvas_.reset(new CanvasSkia);
+  // FIXME(brettw) for ClearType, we probably want to expand the bounds of
+  // painting by one pixel so that the boundaries will be correct (ClearType
+  // text can depend on the adjacent pixel). Then we would paint just the
+  // inset pixels to the screen.
+  const int width = ps_.rcPaint.right - ps_.rcPaint.left;
+  const int height = ps_.rcPaint.bottom - ps_.rcPaint.top;
+  if (!canvas_->Init(width, height, true))
+    return false;
+
+  // This will bring the canvas into the screen coordinate system for the
+  // dirty rect
+  canvas_->skia_canvas()->translate(SkIntToScalar(-ps_.rcPaint.left),
+                                    SkIntToScalar(-ps_.rcPaint.top));
+  return true;
+}
+
+}  // namespace gfx
+