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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_COMPOSITOR_PAINT_CACHE_H_
#define UI_COMPOSITOR_PAINT_CACHE_H_
#include "cc/paint/paint_record.h"
#include "third_party/abseil-cpp/absl/types/optional.h"
#include "ui/compositor/compositor_export.h"
#include "ui/gfx/geometry/rect.h"
namespace ui {
class PaintContext;
class PaintRecorder;
// A class that holds the output of a PaintRecorder to be reused when the
// object that created the PaintRecorder has not been changed/invalidated.
class COMPOSITOR_EXPORT PaintCache {
public:
PaintCache();
PaintCache(const PaintCache&) = delete;
PaintCache& operator=(const PaintCache&) = delete;
~PaintCache();
// Returns true if the PaintCache was able to insert a previously-saved
// painting output into the PaintContext. If it returns false, the caller
// needs to do the work of painting, which can be stored into the PaintCache
// to be used next time.
bool UseCache(const PaintContext& context, const gfx::Size& size_in_context);
private:
// Only PaintRecorder can modify these.
friend PaintRecorder;
void SetPaintRecord(cc::PaintRecord record, float device_scale_factor);
// Stored in an sk_sp because PaintOpBuffer requires this to append the cached
// items into it.
absl::optional<cc::PaintRecord> record_;
// This allows paint cache to be device scale factor aware. If a request for
// a cache entry is made that does not match the stored cache entry's DSF,
// then we can reject it instead of returning the incorrect cache entry.
// See https://crbug.com/834114 for details.
float device_scale_factor_ = 0.f;
};
} // namespace ui
#endif // UI_COMPOSITOR_PAINT_CACHE_H_
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