| // 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_IMPELLER_ENTITY_CONTENTS_FILTERS_BLEND_FILTER_CONTENTS_H_ |
| #define FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_BLEND_FILTER_CONTENTS_H_ |
| |
| #include <optional> |
| #include "impeller/entity/contents/filters/color_filter_contents.h" |
| #include "impeller/entity/contents/filters/inputs/filter_input.h" |
| #include "impeller/geometry/color.h" |
| |
| namespace impeller { |
| |
| constexpr std::array<std::array<Scalar, 5>, 15> kPorterDuffCoefficients = {{ |
| {0, 0, 0, 0, 0}, // Clear |
| {1, 0, 0, 0, 0}, // Source |
| {0, 0, 1, 0, 0}, // Destination |
| {1, 0, 1, -1, 0}, // SourceOver |
| {1, -1, 1, 0, 0}, // DestinationOver |
| {0, 1, 0, 0, 0}, // SourceIn |
| {0, 0, 0, 1, 0}, // DestinationIn |
| {1, -1, 0, 0, 0}, // SourceOut |
| {0, 0, 1, -1, 0}, // DestinationOut |
| {0, 1, 1, -1, 0}, // SourceATop |
| {1, -1, 0, 1, 0}, // DestinationATop |
| {1, -1, 1, -1, 0}, // Xor |
| {1, 0, 1, 0, 0}, // Plus |
| {0, 0, 0, 0, 1}, // Modulate |
| {0, 0, 1, 0, -1}, // Screen |
| }}; |
| |
| std::optional<BlendMode> InvertPorterDuffBlend(BlendMode blend_mode); |
| |
| class BlendFilterContents : public ColorFilterContents { |
| public: |
| using AdvancedBlendProc = std::function<std::optional<Entity>( |
| const FilterInput::Vector& inputs, |
| const ContentContext& renderer, |
| const Entity& entity, |
| const Rect& coverage, |
| BlendMode blend_mode, |
| std::optional<Color> foreground_color, |
| ColorFilterContents::AbsorbOpacity absorb_opacity, |
| std::optional<Scalar> alpha)>; |
| |
| BlendFilterContents(); |
| |
| ~BlendFilterContents() override; |
| |
| void SetBlendMode(BlendMode blend_mode); |
| |
| /// @brief Sets a source color which is blended after all of the inputs have |
| /// been blended. |
| void SetForegroundColor(std::optional<Color> color); |
| |
| private: |
| // |FilterContents| |
| std::optional<Entity> RenderFilter( |
| const FilterInput::Vector& inputs, |
| const ContentContext& renderer, |
| const Entity& entity, |
| const Matrix& effect_transform, |
| const Rect& coverage, |
| const std::optional<Rect>& coverage_hint) const override; |
| |
| /// @brief Optimized advanced blend that avoids a second subpass when there is |
| /// only a single input and a foreground color. |
| /// |
| /// These contents cannot absorb opacity. |
| std::optional<Entity> CreateForegroundAdvancedBlend( |
| const std::shared_ptr<FilterInput>& input, |
| const ContentContext& renderer, |
| const Entity& entity, |
| const Rect& coverage, |
| Color foreground_color, |
| BlendMode blend_mode, |
| std::optional<Scalar> alpha, |
| ColorFilterContents::AbsorbOpacity absorb_opacity) const; |
| |
| /// @brief Optimized porter-duff blend that avoids a second subpass when there |
| /// is only a single input and a foreground color. |
| /// |
| /// These contents cannot absorb opacity. |
| std::optional<Entity> CreateForegroundPorterDuffBlend( |
| const std::shared_ptr<FilterInput>& input, |
| const ContentContext& renderer, |
| const Entity& entity, |
| const Rect& coverage, |
| Color foreground_color, |
| BlendMode blend_mode, |
| std::optional<Scalar> alpha, |
| ColorFilterContents::AbsorbOpacity absorb_opacity) const; |
| |
| BlendMode blend_mode_ = BlendMode::kSourceOver; |
| std::optional<Color> foreground_color_; |
| |
| BlendFilterContents(const BlendFilterContents&) = delete; |
| |
| BlendFilterContents& operator=(const BlendFilterContents&) = delete; |
| }; |
| |
| } // namespace impeller |
| |
| #endif // FLUTTER_IMPELLER_ENTITY_CONTENTS_FILTERS_BLEND_FILTER_CONTENTS_H_ |