already_AddRefed<Layer>
nsVideoFrame::BuildLayer(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
nsDisplayItem* aItem,
const ContainerLayerParameters& aContainerParameters)
{
nsRect area = GetContentRect() - GetPosition() + aItem->ToReferenceFrame();
HTMLVideoElement* element = static_cast<HTMLVideoElement*>(GetContent());
nsIntSize videoSize;
if (NS_FAILED(element->GetVideoSize(&videoSize)) || area.IsEmpty()) {
return nullptr;
}
nsRefPtr<ImageContainer> container = element->GetImageContainer();
if (!container)
return nullptr;
// Retrieve the size of the decoded video frame, before being scaled
// by pixel aspect ratio.
mozilla::gfx::IntSize frameSize = container->GetCurrentSize();
if (frameSize.width == 0 || frameSize.height == 0) {
// No image, or zero-sized image. No point creating a layer.
return nullptr;
}
// Compute the rectangle in which to paint the video. We need to use
// the largest rectangle that fills our content-box and has the
// correct aspect ratio.
nsPresContext* presContext = PresContext();
gfxRect r = gfxRect(presContext->AppUnitsToGfxUnits(area.x),
presContext->AppUnitsToGfxUnits(area.y),
presContext->AppUnitsToGfxUnits(area.width),
presContext->AppUnitsToGfxUnits(area.height));
r = CorrectForAspectRatio(r, videoSize);
r.Round();
if (r.IsEmpty()) {
return nullptr;
}
IntSize scaleHint(static_cast<int32_t>(r.Width()),
static_cast<int32_t>(r.Height()));
container->SetScaleHint(scaleHint);
nsRefPtr<ImageLayer> layer = static_cast<ImageLayer*>
(aManager->GetLayerBuilder()->GetLeafLayerFor(aBuilder, aItem));
if (!layer) {
layer = aManager->CreateImageLayer();
if (!layer)
return nullptr;
}
layer->SetContainer(container);
layer->SetFilter(nsLayoutUtils::GetGraphicsFilterForFrame(this));
layer->SetContentFlags(Layer::CONTENT_OPAQUE);
// Set a transform on the layer to draw the video in the right place
gfx::Matrix transform;
gfxPoint p = r.TopLeft() + aContainerParameters.mOffset;
transform.Translate(p.x, p.y);
transform.Scale(r.Width()/frameSize.width, r.Height()/frameSize.height);
layer->SetBaseTransform(gfx::Matrix4x4::From2D(transform));
layer->SetVisibleRegion(nsIntRect(0, 0, frameSize.width, frameSize.height));
nsRefPtr<Layer> result = layer.forget();
return result.forget();
}
already_AddRefed<Layer>
nsVideoFrame::BuildLayer(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
nsDisplayItem* aItem,
const ContainerLayerParameters& aContainerParameters)
{
nsRect area = GetContentRectRelativeToSelf() + aItem->ToReferenceFrame();
HTMLVideoElement* element = static_cast<HTMLVideoElement*>(GetContent());
nsIntSize videoSizeInPx;
if (NS_FAILED(element->GetVideoSize(&videoSizeInPx)) ||
area.IsEmpty()) {
return nullptr;
}
RefPtr<ImageContainer> container = element->GetImageContainer();
if (!container)
return nullptr;
// Retrieve the size of the decoded video frame, before being scaled
// by pixel aspect ratio.
mozilla::gfx::IntSize frameSize = container->GetCurrentSize();
if (frameSize.width == 0 || frameSize.height == 0) {
// No image, or zero-sized image. No point creating a layer.
return nullptr;
}
// Convert video size from pixel units into app units, to get an aspect-ratio
// (which has to be represented as a nsSize) and an IntrinsicSize that we
// can pass to ComputeObjectRenderRect.
nsSize aspectRatio(nsPresContext::CSSPixelsToAppUnits(videoSizeInPx.width),
nsPresContext::CSSPixelsToAppUnits(videoSizeInPx.height));
IntrinsicSize intrinsicSize;
intrinsicSize.width.SetCoordValue(aspectRatio.width);
intrinsicSize.height.SetCoordValue(aspectRatio.height);
nsRect dest = nsLayoutUtils::ComputeObjectDestRect(area,
intrinsicSize,
aspectRatio,
StylePosition());
gfxRect destGFXRect = PresContext()->AppUnitsToGfxUnits(dest);
destGFXRect.Round();
if (destGFXRect.IsEmpty()) {
return nullptr;
}
VideoInfo::Rotation rotationDeg = element->RotationDegrees();
IntSize scaleHint(static_cast<int32_t>(destGFXRect.Width()),
static_cast<int32_t>(destGFXRect.Height()));
// scaleHint is set regardless of rotation, so swap w/h if needed.
SwapScaleWidthHeightForRotation(scaleHint, rotationDeg);
container->SetScaleHint(scaleHint);
RefPtr<ImageLayer> layer = static_cast<ImageLayer*>
(aManager->GetLayerBuilder()->GetLeafLayerFor(aBuilder, aItem));
if (!layer) {
layer = aManager->CreateImageLayer();
if (!layer)
return nullptr;
}
layer->SetContainer(container);
layer->SetSamplingFilter(nsLayoutUtils::GetSamplingFilterForFrame(this));
// Set a transform on the layer to draw the video in the right place
gfxPoint p = destGFXRect.TopLeft() + aContainerParameters.mOffset;
Matrix preTransform = ComputeRotationMatrix(destGFXRect.Width(),
destGFXRect.Height(),
rotationDeg);
Matrix transform = preTransform * Matrix::Translation(p.x, p.y);
layer->SetBaseTransform(gfx::Matrix4x4::From2D(transform));
layer->SetScaleToSize(scaleHint, ScaleMode::STRETCH);
RefPtr<Layer> result = layer.forget();
return result.forget();
}