solid_color_contents.cc

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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.
 
#include "solid_color_contents.h"
 
#include "impeller/entity/contents/clip_contents.h"
#include "impeller/entity/contents/content_context.h"
#include "impeller/entity/entity.h"
#include "impeller/geometry/path.h"
#include "impeller/renderer/render_pass.h"
 
namespace impeller {
 
SolidColorContents::SolidColorContents() = default;
 
SolidColorContents::~SolidColorContents() = default;
 
void SolidColorContents::SetColor(Color color) {
  color_ = color;
}
 
Color SolidColorContents::GetColor() const {
  return color_.WithAlpha(color_.alpha * GetOpacityFactor());
}
 
bool SolidColorContents::IsSolidColor() const {
  return true;
}
 
bool SolidColorContents::IsOpaque() const {
  return GetColor().IsOpaque();
}
 
std::optional<Rect> SolidColorContents::GetCoverage(
    const Entity& entity) const {
  if (GetColor().IsTransparent()) {
    return std::nullopt;
  }
 
  auto geometry = GetGeometry();
  if (geometry == nullptr) {
    return std::nullopt;
  }
  return geometry->GetCoverage(entity.GetTransform());
};
 
bool SolidColorContents::Render(const ContentContext& renderer,
                                const Entity& entity,
                                RenderPass& pass) const {
  auto capture = entity.GetCapture().CreateChild("SolidColorContents");
 
  using VS = SolidFillPipeline::VertexShader;
 
  Command cmd;
  DEBUG_COMMAND_INFO(cmd, "Solid Fill");
  cmd.stencil_reference = entity.GetClipDepth();
 
  auto geometry_result =
      GetGeometry()->GetPositionBuffer(renderer, entity, pass);
 
  auto options = OptionsFromPassAndEntity(pass, entity);
  if (geometry_result.prevent_overdraw) {
    options.stencil_compare = CompareFunction::kEqual;
    options.stencil_operation = StencilOperation::kIncrementClamp;
  }
 
  options.primitive_type = geometry_result.type;
  cmd.pipeline = renderer.GetSolidFillPipeline(options);
  cmd.BindVertices(std::move(geometry_result.vertex_buffer));
 
  VS::FrameInfo frame_info;
  frame_info.mvp = capture.AddMatrix("Transform", geometry_result.transform);
  frame_info.color = capture.AddColor("Color", GetColor()).Premultiply();
  VS::BindFrameInfo(cmd, pass.GetTransientsBuffer().EmplaceUniform(frame_info));
 
  if (!pass.AddCommand(std::move(cmd))) {
    return false;
  }
 
  if (geometry_result.prevent_overdraw) {
    auto restore = ClipRestoreContents();
    restore.SetRestoreCoverage(GetCoverage(entity));
    return restore.Render(renderer, entity, pass);
  }
  return true;
}
 
std::unique_ptr<SolidColorContents> SolidColorContents::Make(Path path,
                                                             Color color) {
  auto contents = std::make_unique<SolidColorContents>();
  contents->SetGeometry(Geometry::MakeFillPath(std::move(path)));
  contents->SetColor(color);
  return contents;
}
 
std::optional<Color> SolidColorContents::AsBackgroundColor(
    const Entity& entity,
    ISize target_size) const {
  Rect target_rect = Rect::MakeSize(target_size);
  return GetGeometry()->CoversArea(entity.GetTransform(), target_rect)
             ? GetColor()
             : std::optional<Color>();
}
 
bool SolidColorContents::ApplyColorFilter(
    const ColorFilterProc& color_filter_proc) {
  color_ = color_filter_proc(color_);
  return true;
}
 
}  // namespace impeller