| // 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 "linear_gradient_contents.h" |
| |
| #include "impeller/core/formats.h" |
| #include "impeller/entity/contents/content_context.h" |
| #include "impeller/entity/contents/gradient_generator.h" |
| #include "impeller/entity/entity.h" |
| #include "impeller/renderer/render_pass.h" |
| |
| namespace impeller { |
| |
| LinearGradientContents::LinearGradientContents() = default; |
| |
| LinearGradientContents::~LinearGradientContents() = default; |
| |
| void LinearGradientContents::SetEndPoints(Point start_point, Point end_point) { |
| start_point_ = start_point; |
| end_point_ = end_point; |
| } |
| |
| void LinearGradientContents::SetColors(std::vector<Color> colors) { |
| colors_ = std::move(colors); |
| } |
| |
| void LinearGradientContents::SetStops(std::vector<Scalar> stops) { |
| stops_ = std::move(stops); |
| } |
| |
| const std::vector<Color>& LinearGradientContents::GetColors() const { |
| return colors_; |
| } |
| |
| const std::vector<Scalar>& LinearGradientContents::GetStops() const { |
| return stops_; |
| } |
| |
| void LinearGradientContents::SetTileMode(Entity::TileMode tile_mode) { |
| tile_mode_ = tile_mode; |
| } |
| |
| bool LinearGradientContents::IsOpaque() const { |
| if (GetOpacityFactor() < 1 || tile_mode_ == Entity::TileMode::kDecal) { |
| return false; |
| } |
| for (auto color : colors_) { |
| if (!color.IsOpaque()) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| bool LinearGradientContents::Render(const ContentContext& renderer, |
| const Entity& entity, |
| RenderPass& pass) const { |
| if (renderer.GetDeviceCapabilities().SupportsSSBO()) { |
| return RenderSSBO(renderer, entity, pass); |
| } |
| return RenderTexture(renderer, entity, pass); |
| } |
| |
| bool LinearGradientContents::RenderTexture(const ContentContext& renderer, |
| const Entity& entity, |
| RenderPass& pass) const { |
| using VS = LinearGradientFillPipeline::VertexShader; |
| using FS = LinearGradientFillPipeline::FragmentShader; |
| |
| VS::FrameInfo frame_info; |
| frame_info.matrix = GetInverseEffectTransform(); |
| |
| PipelineBuilderCallback pipeline_callback = |
| [&renderer](ContentContextOptions options) { |
| return renderer.GetLinearGradientFillPipeline(options); |
| }; |
| return ColorSourceContents::DrawPositions<VS>( |
| renderer, entity, pass, pipeline_callback, frame_info, |
| [this, &renderer](RenderPass& pass) { |
| auto gradient_data = CreateGradientBuffer(colors_, stops_); |
| auto gradient_texture = |
| CreateGradientTexture(gradient_data, renderer.GetContext()); |
| if (gradient_texture == nullptr) { |
| return false; |
| } |
| |
| FS::FragInfo frag_info; |
| frag_info.start_point = start_point_; |
| frag_info.end_point = end_point_; |
| frag_info.tile_mode = static_cast<Scalar>(tile_mode_); |
| frag_info.decal_border_color = decal_border_color_; |
| frag_info.texture_sampler_y_coord_scale = |
| gradient_texture->GetYCoordScale(); |
| frag_info.alpha = GetOpacityFactor(); |
| frag_info.half_texel = |
| Vector2(0.5 / gradient_texture->GetSize().width, |
| 0.5 / gradient_texture->GetSize().height); |
| |
| pass.SetCommandLabel("LinearGradientFill"); |
| |
| SamplerDescriptor sampler_desc; |
| sampler_desc.min_filter = MinMagFilter::kLinear; |
| sampler_desc.mag_filter = MinMagFilter::kLinear; |
| |
| FS::BindTextureSampler( |
| pass, std::move(gradient_texture), |
| renderer.GetContext()->GetSamplerLibrary()->GetSampler( |
| sampler_desc)); |
| FS::BindFragInfo( |
| pass, renderer.GetTransientsBuffer().EmplaceUniform(frag_info)); |
| return true; |
| }); |
| } |
| |
| bool LinearGradientContents::RenderSSBO(const ContentContext& renderer, |
| const Entity& entity, |
| RenderPass& pass) const { |
| using VS = LinearGradientSSBOFillPipeline::VertexShader; |
| using FS = LinearGradientSSBOFillPipeline::FragmentShader; |
| |
| VS::FrameInfo frame_info; |
| frame_info.matrix = GetInverseEffectTransform(); |
| |
| PipelineBuilderCallback pipeline_callback = |
| [&renderer](ContentContextOptions options) { |
| return renderer.GetLinearGradientSSBOFillPipeline(options); |
| }; |
| return ColorSourceContents::DrawPositions<VS>( |
| renderer, entity, pass, pipeline_callback, frame_info, |
| [this, &renderer](RenderPass& pass) { |
| FS::FragInfo frag_info; |
| frag_info.start_point = start_point_; |
| frag_info.end_point = end_point_; |
| frag_info.tile_mode = static_cast<Scalar>(tile_mode_); |
| frag_info.decal_border_color = decal_border_color_; |
| frag_info.alpha = GetOpacityFactor(); |
| |
| auto& host_buffer = renderer.GetTransientsBuffer(); |
| auto colors = CreateGradientColors(colors_, stops_); |
| |
| frag_info.colors_length = colors.size(); |
| auto color_buffer = |
| host_buffer.Emplace(colors.data(), colors.size() * sizeof(StopData), |
| DefaultUniformAlignment()); |
| |
| pass.SetCommandLabel("LinearGradientSSBOFill"); |
| |
| FS::BindFragInfo( |
| pass, renderer.GetTransientsBuffer().EmplaceUniform(frag_info)); |
| FS::BindColorData(pass, color_buffer); |
| |
| return true; |
| }); |
| } |
| |
| bool LinearGradientContents::ApplyColorFilter( |
| const ColorFilterProc& color_filter_proc) { |
| for (Color& color : colors_) { |
| color = color_filter_proc(color); |
| } |
| decal_border_color_ = color_filter_proc(decal_border_color_); |
| return true; |
| } |
| |
| } // namespace impeller |