blob: b1c65b9e58755d64774252e722b4e71bc5418fe3 [file] [log] [blame]
// 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 "impeller/entity/contents/rrect_shadow_contents.h"
#include <optional>
#include "impeller/entity/contents/content_context.h"
#include "impeller/entity/entity.h"
#include "impeller/geometry/path.h"
#include "impeller/geometry/path_builder.h"
#include "impeller/renderer/render_pass.h"
#include "impeller/renderer/vertex_buffer_builder.h"
#include "impeller/tessellator/tessellator.h"
namespace impeller {
RRectShadowContents::RRectShadowContents() = default;
RRectShadowContents::~RRectShadowContents() = default;
void RRectShadowContents::SetRRect(std::optional<Rect> rect,
Scalar corner_radius) {
rect_ = rect;
corner_radius_ = corner_radius;
}
void RRectShadowContents::SetSigma(Sigma sigma) {
sigma_ = sigma;
}
void RRectShadowContents::SetColor(Color color) {
color_ = color.Premultiply();
}
std::optional<Rect> RRectShadowContents::GetCoverage(
const Entity& entity) const {
if (!rect_.has_value()) {
return std::nullopt;
}
Scalar radius = Radius{sigma_}.radius;
auto ltrb = rect_->GetLTRB();
Rect bounds = Rect::MakeLTRB(ltrb[0] - radius, ltrb[1] - radius,
ltrb[2] + radius, ltrb[3] + radius);
return bounds.TransformBounds(entity.GetTransformation());
};
bool RRectShadowContents::Render(const ContentContext& renderer,
const Entity& entity,
RenderPass& pass) const {
if (!rect_.has_value()) {
return true;
}
using VS = RRectBlurPipeline::VertexShader;
using FS = RRectBlurPipeline::FragmentShader;
VertexBufferBuilder<VS::PerVertexData> vtx_builder;
auto blur_radius = Radius{sigma_}.radius;
auto positive_rect = rect_->GetPositive();
{
auto left = -blur_radius;
auto top = -blur_radius;
auto right = positive_rect.size.width + blur_radius;
auto bottom = positive_rect.size.height + blur_radius;
vtx_builder.AddVertices({
{Point(left, top)},
{Point(right, top)},
{Point(left, bottom)},
{Point(left, bottom)},
{Point(right, top)},
{Point(right, bottom)},
});
}
Command cmd;
cmd.label = "RRect Shadow";
auto opts = OptionsFromPassAndEntity(pass, entity);
opts.primitive_type = PrimitiveType::kTriangle;
cmd.pipeline = renderer.GetRRectBlurPipeline(opts);
cmd.stencil_reference = entity.GetStencilDepth();
cmd.BindVertices(vtx_builder.CreateVertexBuffer(pass.GetTransientsBuffer()));
VS::VertInfo vert_info;
vert_info.mvp = Matrix::MakeOrthographic(pass.GetRenderTargetSize()) *
entity.GetTransformation() *
Matrix::MakeTranslation({positive_rect.origin});
VS::BindVertInfo(cmd, pass.GetTransientsBuffer().EmplaceUniform(vert_info));
FS::FragInfo frag_info;
frag_info.color = color_;
frag_info.blur_sigma = sigma_.sigma;
frag_info.rect_size = Point(positive_rect.size);
frag_info.corner_radius =
std::min(corner_radius_, std::min(positive_rect.size.width / 2.0f,
positive_rect.size.height / 2.0f));
FS::BindFragInfo(cmd, pass.GetTransientsBuffer().EmplaceUniform(frag_info));
if (!pass.AddCommand(std::move(cmd))) {
return false;
}
return true;
}
} // namespace impeller