blob: 1623b4baed93fcba5d57b5731b1542ba8416835b [file] [log] [blame]
// Copyright (c) 2012 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 "skia/ext/platform_canvas.h"
#include "ui/gfx/canvas.h"
#import <Cocoa/Cocoa.h>
namespace gfx {
// A class designed to translate skia painting into a region to the current
// graphics context. On construction, it will set up a context for painting
// into, and on destruction, it will commit it to the current context.
// Note: The created context is always inialized to (0, 0, 0, 0).
class GFX_EXPORT CanvasSkiaPaint : public Canvas {
// This constructor assumes the result is opaque.
explicit CanvasSkiaPaint(NSRect dirtyRect);
CanvasSkiaPaint(NSRect dirtyRect, bool opaque);
~CanvasSkiaPaint() override;
// If true, the data painted into the CanvasSkiaPaint is blended onto the
// current context, else it is copied.
void set_composite_alpha(bool composite_alpha) {
composite_alpha_ = composite_alpha;
// Returns true if the invalid region is empty. The caller should call this
// function to determine if anything needs painting.
bool is_empty() const {
return NSIsEmptyRect(rectangle_);
const NSRect& rectangle() const {
return rectangle_;
void Init(bool opaque);
NSRect rectangle_;
// See description above setter.
bool composite_alpha_;
// Disallow copy and assign.
CanvasSkiaPaint(const CanvasSkiaPaint&);
CanvasSkiaPaint& operator=(const CanvasSkiaPaint&);
} // namespace gfx