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Unified Diff: ui/compositor/canvas_painter.h

Issue 1161933007: ui: Introduce CanvasPainter, remove PaintContext(gfx::Canvas*). (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: canvaspainter: . Created 5 years, 6 months ago
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Index: ui/compositor/canvas_painter.h
diff --git a/ui/compositor/canvas_painter.h b/ui/compositor/canvas_painter.h
new file mode 100644
index 0000000000000000000000000000000000000000..6d8d39023535f1a8f030cd94eeaaa19236f1e9f0
--- /dev/null
+++ b/ui/compositor/canvas_painter.h
@@ -0,0 +1,48 @@
+// Copyright 2015 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.
+
+#ifndef UI_COMPOSITOR_CANVAS_PAINTER_H_
+#define UI_COMPOSITOR_CANVAS_PAINTER_H_
+
+#include "base/memory/ref_counted.h"
+#include "ui/compositor/compositor_export.h"
+#include "ui/compositor/paint_context.h"
+#include "ui/gfx/geometry/rect.h"
+
+namespace cc {
+class DisplayItemList;
+}
+
+namespace gfx {
+class Canvas;
+}
+
+namespace ui {
+
+// This class provides a simple helper for painting directly to a bitmap
+// backed canvas (for painting use-cases other than compositing). After
+// constructing an instance of a CanvasPainter, the context() can be used
+// to do painting using the normal composited paint paths. When
+// the painter is destroyed, any painting done with the context() will be
+// rastered into the canvas.
+class COMPOSITOR_EXPORT CanvasPainter {
+ public:
+ CanvasPainter(gfx::Canvas* canvas, float raster_scale_factor);
+ ~CanvasPainter();
+
+ const PaintContext& context() const { return context_; }
+
+ private:
+ gfx::Canvas* const canvas_;
+ const float raster_scale_factor_;
+ const gfx::Rect rect_;
+ scoped_refptr<cc::DisplayItemList> list_;
+ PaintContext context_;
+
+ DISALLOW_COPY_AND_ASSIGN(CanvasPainter);
+};
+
+} // namespace ui
+
+#endif // UI_COMPOSITOR_CANVAS_PAINTER_H_
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