flutter_flutter/flutter/lib/ui/compositing/scene_builder.cc

// Copyright 2015 The Chromium 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 "flutter/lib/ui/compositing/scene_builder.h"

#include "flow/layers/backdrop_filter_layer.h"
#include "flow/layers/child_scene_layer.h"
#include "flow/layers/clip_path_layer.h"
#include "flow/layers/clip_rect_layer.h"
#include "flow/layers/clip_rrect_layer.h"
#include "flow/layers/color_filter_layer.h"
#include "flow/layers/container_layer.h"
#include "flow/layers/opacity_layer.h"
#include "flow/layers/performance_overlay_layer.h"
#include "flow/layers/picture_layer.h"
#include "flow/layers/shader_mask_layer.h"
#include "flow/layers/transform_layer.h"
#include "flutter/lib/ui/painting/matrix.h"
#include "flutter/lib/ui/painting/shader.h"
#include "flutter/tonic/dart_args.h"
#include "flutter/tonic/dart_binding_macros.h"
#include "flutter/tonic/dart_converter.h"
#include "flutter/tonic/dart_library_natives.h"
#include "third_party/skia/include/core/SkColorFilter.h"

namespace blink {

static void SceneBuilder_constructor(Dart_NativeArguments args) {
  DartCallConstructor(&SceneBuilder::create, args);
}

IMPLEMENT_WRAPPERTYPEINFO(ui, SceneBuilder);

#define FOR_EACH_BINDING(V) \
  V(SceneBuilder, pushTransform) \
  V(SceneBuilder, pushClipRect) \
  V(SceneBuilder, pushClipRRect) \
  V(SceneBuilder, pushClipPath) \
  V(SceneBuilder, pushOpacity) \
  V(SceneBuilder, pushColorFilter) \
  V(SceneBuilder, pushBackdropFilter) \
  V(SceneBuilder, pushShaderMask) \
  V(SceneBuilder, pop) \
  V(SceneBuilder, addPicture) \
  V(SceneBuilder, addChildScene) \
  V(SceneBuilder, addPerformanceOverlay) \
  V(SceneBuilder, setRasterizerTracingThreshold) \
  V(SceneBuilder, build)

FOR_EACH_BINDING(DART_NATIVE_CALLBACK)

void SceneBuilder::RegisterNatives(DartLibraryNatives* natives) {
  natives->Register({
    { "SceneBuilder_constructor", SceneBuilder_constructor, 1, true },
FOR_EACH_BINDING(DART_REGISTER_NATIVE)
  });
}

SceneBuilder::SceneBuilder()
    : m_currentLayer(nullptr)
    , m_currentRasterizerTracingThreshold(0)
{
}

SceneBuilder::~SceneBuilder()
{
}

void SceneBuilder::pushTransform(const Float64List& matrix4)
{
    SkMatrix sk_matrix = ToSkMatrix(matrix4);
    std::unique_ptr<flow::TransformLayer> layer(new flow::TransformLayer());
    layer->set_transform(sk_matrix);
    addLayer(std::move(layer));
}

void SceneBuilder::pushClipRect(double left, double right, double top, double bottom)
{
    std::unique_ptr<flow::ClipRectLayer> layer(new flow::ClipRectLayer());
    layer->set_clip_rect(SkRect::MakeLTRB(left, top, right, bottom));
    addLayer(std::move(layer));
}

void SceneBuilder::pushClipRRect(const RRect& rrect)
{
    std::unique_ptr<flow::ClipRRectLayer> layer(new flow::ClipRRectLayer());
    layer->set_clip_rrect(rrect.sk_rrect);
    addLayer(std::move(layer));
}

void SceneBuilder::pushClipPath(const CanvasPath* path)
{
    std::unique_ptr<flow::ClipPathLayer> layer(new flow::ClipPathLayer());
    layer->set_clip_path(path->path());
    addLayer(std::move(layer));
}

void SceneBuilder::pushOpacity(int alpha)
{
    std::unique_ptr<flow::OpacityLayer> layer(new flow::OpacityLayer());
    layer->set_alpha(alpha);
    addLayer(std::move(layer));
}

void SceneBuilder::pushColorFilter(int color, int transferMode)
{
    std::unique_ptr<flow::ColorFilterLayer> layer(new flow::ColorFilterLayer());
    layer->set_color(static_cast<SkColor>(color));
    layer->set_transfer_mode(static_cast<SkXfermode::Mode>(transferMode));
    addLayer(std::move(layer));
}

void SceneBuilder::pushBackdropFilter(ImageFilter* filter)
{
    std::unique_ptr<flow::BackdropFilterLayer> layer(new flow::BackdropFilterLayer());
    layer->set_filter(filter->filter());
    addLayer(std::move(layer));
}

void SceneBuilder::pushShaderMask(Shader* shader,
                                  double maskRectLeft,
                                  double maskRectRight,
                                  double maskRectTop,
                                  double maskRectBottom,
                                  int transferMode)
{
    std::unique_ptr<flow::ShaderMaskLayer> layer(new flow::ShaderMaskLayer());
    layer->set_shader(shader->shader());
    layer->set_mask_rect(SkRect::MakeLTRB(maskRectLeft, maskRectTop, maskRectRight, maskRectBottom));
    layer->set_transfer_mode(static_cast<SkXfermode::Mode>(transferMode));
    addLayer(std::move(layer));
}

void SceneBuilder::addLayer(std::unique_ptr<flow::ContainerLayer> layer)
{
    DCHECK(layer);
    if (!m_rootLayer) {
        DCHECK(!m_currentLayer);
        m_rootLayer = std::move(layer);
        m_currentLayer = m_rootLayer.get();
        return;
    }
    if (!m_currentLayer)
        return;
    flow::ContainerLayer* newLayer = layer.get();
    m_currentLayer->Add(std::move(layer));
    m_currentLayer = newLayer;
}

void SceneBuilder::pop()
{
    if (!m_currentLayer)
        return;
    m_currentLayer = m_currentLayer->parent();
}

void SceneBuilder::addPicture(double dx, double dy, Picture* picture)
{
    if (!m_currentLayer)
        return;
    std::unique_ptr<flow::PictureLayer> layer(new flow::PictureLayer());
    layer->set_offset(SkPoint::Make(dx, dy));
    layer->set_picture(picture->picture());
    m_currentLayer->Add(std::move(layer));
}

void SceneBuilder::addChildScene(double dx,
                                 double dy,
                                 double devicePixelRatio,
                                 int physicalWidth,
                                 int physicalHeight,
                                 uint32_t sceneToken) {
    if (!m_currentLayer)
        return;
    std::unique_ptr<flow::ChildSceneLayer> layer(new flow::ChildSceneLayer());
    layer->set_offset(SkPoint::Make(dx, dy));
    layer->set_device_pixel_ratio(devicePixelRatio);
    layer->set_physical_size(SkISize::Make(physicalWidth, physicalHeight));
    mojo::gfx::composition::SceneTokenPtr token = mojo::gfx::composition::SceneToken::New();
    token->value = sceneToken;
    layer->set_scene_token(token.Pass());
    m_currentLayer->Add(std::move(layer));
}

void SceneBuilder::addPerformanceOverlay(uint64_t enabledOptions,
                                         double left,
                                         double right,
                                         double top,
                                         double bottom)
{
    if (!m_currentLayer)
        return;
    std::unique_ptr<flow::PerformanceOverlayLayer> layer(new flow::PerformanceOverlayLayer(enabledOptions));
    layer->set_paint_bounds(SkRect::MakeLTRB(left, top, right, bottom));
    m_currentLayer->Add(std::move(layer));
}

void SceneBuilder::setRasterizerTracingThreshold(uint32_t frameInterval)
{
    m_currentRasterizerTracingThreshold = frameInterval;
}

scoped_refptr<Scene> SceneBuilder::build()
{
    m_currentLayer = nullptr;
    int32_t threshold = m_currentRasterizerTracingThreshold;
    m_currentRasterizerTracingThreshold = 0;
    scoped_refptr<Scene> scene = Scene::create(std::move(m_rootLayer), threshold);
    ClearDartWrapper();
    return std::move(scene);
}

} // namespace blink