void
FrameBuilder::ProcessChildList(ContainerLayer* aContainer,
RenderViewMLGPU* aView,
const RenderTargetIntRect& aParentClipRect,
const Maybe<gfx::Polygon>& aParentGeometry)
{
nsTArray<LayerPolygon> polygons =
aContainer->SortChildrenBy3DZOrder(ContainerLayer::SortMode::WITH_GEOMETRY);
// Visit layers in front-to-back order.
for (auto iter = polygons.rbegin(); iter != polygons.rend(); iter++) {
LayerPolygon& entry = *iter;
Layer* child = entry.layer;
if (child->IsBackfaceHidden() || !child->IsVisible()) {
continue;
}
RenderTargetIntRect clip = child->CalculateScissorRect(aParentClipRect);
if (clip.IsEmpty()) {
continue;
}
Maybe<gfx::Polygon> geometry;
if (aParentGeometry && entry.geometry) {
// Both parent and child are split.
geometry = Some(aParentGeometry->ClipPolygon(*entry.geometry));
} else if (aParentGeometry) {
geometry = aParentGeometry;
} else if (entry.geometry) {
geometry = Move(entry.geometry);
}
AssignLayer(child, aView, clip, Move(geometry));
}
}
void
Compositor::DrawGeometry(const gfx::Rect& aRect,
const gfx::IntRect& aClipRect,
const EffectChain& aEffectChain,
gfx::Float aOpacity,
const gfx::Matrix4x4& aTransform,
const gfx::Rect& aVisibleRect,
const Maybe<gfx::Polygon3D>& aGeometry)
{
if (!aGeometry) {
DrawQuad(aRect, aClipRect, aEffectChain,
aOpacity, aTransform, aVisibleRect);
return;
}
// Cull invisible polygons.
if (aRect.Intersect(aGeometry->BoundingBox()).IsEmpty()) {
return;
}
gfx::Polygon3D clipped = aGeometry->ClipPolygon(aRect);
nsTArray<gfx::Triangle> triangles = clipped.ToTriangles();
for (gfx::Triangle& geometry : triangles) {
const gfx::Rect intersection = aRect.Intersect(geometry.BoundingBox());
// Cull invisible triangles.
if (intersection.IsEmpty()) {
continue;
}
MOZ_ASSERT(aRect.width > 0.0f && aRect.height > 0.0f);
MOZ_ASSERT(intersection.width > 0.0f && intersection.height > 0.0f);
gfx::TexturedTriangle triangle(Move(geometry));
triangle.width = aRect.width;
triangle.height = aRect.height;
// Since the texture was created for non-split geometry, we need to
// update the texture coordinates to account for the split.
if (aEffectChain.mPrimaryEffect->mType == EffectTypes::RGB) {
TexturedEffect* texturedEffect =
static_cast<TexturedEffect*>(aEffectChain.mPrimaryEffect.get());
UpdateTextureCoordinates(triangle, aRect, intersection,
texturedEffect->mTextureCoords);
}
DrawTriangle(triangle, aClipRect, aEffectChain,
aOpacity, aTransform, aVisibleRect);
}
}
