linear_gradient_contents.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.
 
#pragma once
 
#include <functional>
#include <memory>
#include <vector>
 
#include "flutter/fml/macros.h"
#include "flutter/impeller/core/texture.h"
#include "impeller/entity/contents/color_source_contents.h"
#include "impeller/entity/entity.h"
#include "impeller/geometry/color.h"
#include "impeller/geometry/gradient.h"
#include "impeller/geometry/path.h"
#include "impeller/geometry/point.h"
 
namespace impeller {
 
class LinearGradientContents final : public ColorSourceContents {
 public:
  LinearGradientContents();
 
  ~LinearGradientContents() override;
 
  // |Contents|
  bool IsOpaque() const override;
 
  // |Contents|
  bool Render(const ContentContext& renderer,
              const Entity& entity,
              RenderPass& pass) const override;
 
  // |Contents|
  [[nodiscard]] bool ApplyColorFilter(
      const ColorFilterProc& color_filter_proc) override;
 
  void SetEndPoints(Point start_point, Point end_point);
 
  void SetColors(std::vector<Color> colors);
 
  void SetStops(std::vector<Scalar> stops);
 
  const std::vector<Color>& GetColors() const;
 
  const std::vector<Scalar>& GetStops() const;
 
  void SetTileMode(Entity::TileMode tile_mode);
 
  void SetDither(bool dither);
 
 private:
  bool RenderTexture(const ContentContext& renderer,
                     const Entity& entity,
                     RenderPass& pass) const;
 
  bool RenderSSBO(const ContentContext& renderer,
                  const Entity& entity,
                  RenderPass& pass) const;
 
  Point start_point_;
  Point end_point_;
  std::vector<Color> colors_;
  std::vector<Scalar> stops_;
  Entity::TileMode tile_mode_;
  Color decal_border_color_ = Color::BlackTransparent();
  bool dither_ = false;
 
  FML_DISALLOW_COPY_AND_ASSIGN(LinearGradientContents);
};
 
}  // namespace impeller