dl_matrix_color_source_base.h

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// Copyright 2013 The Flutter 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 FLUTTER_DISPLAY_LIST_EFFECTS_COLOR_SOURCES_DL_MATRIX_COLOR_SOURCE_BASE_H_
#define FLUTTER_DISPLAY_LIST_EFFECTS_COLOR_SOURCES_DL_MATRIX_COLOR_SOURCE_BASE_H_
 
#include "flutter/display_list/effects/dl_color_source.h"
 
namespace flutter {
 
// Utility base class common to all DlColorSource implementations that
// hold an optional DlMatrix
class DlMatrixColorSourceBase : public DlColorSource {
 public:
  const DlMatrix& matrix() const { return matrix_; }
  const DlMatrix* matrix_ptr() const {
    return matrix_.IsIdentity() ? nullptr : &matrix_;
  }
 
 protected:
  explicit DlMatrixColorSourceBase(const DlMatrix* matrix)
      : matrix_(matrix ? *matrix : DlMatrix()) {}
 
 private:
  const DlMatrix matrix_;
};
 
}  // namespace flutter
 
#endif  // FLUTTER_DISPLAY_LIST_EFFECTS_COLOR_SOURCES_DL_MATRIX_COLOR_SOURCE_BASE_H_