428 lines
14 KiB
C++
428 lines
14 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* rendering object for the HTML <canvas> element */
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#include "nsHTMLCanvasFrame.h"
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#include "nsGkAtoms.h"
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#include "mozilla/Assertions.h"
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#include "mozilla/dom/HTMLCanvasElement.h"
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#include "nsDisplayList.h"
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#include "nsLayoutUtils.h"
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#include "nsStyleUtil.h"
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#include "ImageLayers.h"
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#include "Layers.h"
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#include "ActiveLayerTracker.h"
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#include <algorithm>
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using namespace mozilla;
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using namespace mozilla::dom;
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using namespace mozilla::layers;
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using namespace mozilla::gfx;
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/* Helper for our nsIFrame::GetIntrinsicSize() impl. Takes the result of
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* "GetCanvasSize()" as a parameter, which may help avoid redundant
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* indirect calls to GetCanvasSize().
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*
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* @param aCanvasSizeInPx The canvas's size in CSS pixels, as returned
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* by GetCanvasSize().
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* @return The canvas's intrinsic size, as an IntrinsicSize object.
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*/
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static IntrinsicSize
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IntrinsicSizeFromCanvasSize(const nsIntSize& aCanvasSizeInPx)
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{
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IntrinsicSize intrinsicSize;
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intrinsicSize.width.SetCoordValue(
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nsPresContext::CSSPixelsToAppUnits(aCanvasSizeInPx.width));
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intrinsicSize.height.SetCoordValue(
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nsPresContext::CSSPixelsToAppUnits(aCanvasSizeInPx.height));
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return intrinsicSize;
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}
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class nsDisplayCanvas : public nsDisplayItem {
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public:
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nsDisplayCanvas(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame)
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: nsDisplayItem(aBuilder, aFrame)
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{
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MOZ_COUNT_CTOR(nsDisplayCanvas);
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}
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#ifdef NS_BUILD_REFCNT_LOGGING
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virtual ~nsDisplayCanvas() {
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MOZ_COUNT_DTOR(nsDisplayCanvas);
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}
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#endif
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NS_DISPLAY_DECL_NAME("nsDisplayCanvas", TYPE_CANVAS)
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virtual nsRegion GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
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bool* aSnap) override {
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*aSnap = false;
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nsHTMLCanvasFrame* f = static_cast<nsHTMLCanvasFrame*>(Frame());
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HTMLCanvasElement* canvas =
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HTMLCanvasElement::FromContent(f->GetContent());
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nsRegion result;
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if (canvas->GetIsOpaque()) {
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// OK, the entire region painted by the canvas is opaque. But what is
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// that region? It's the canvas's "dest rect" (controlled by the
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// object-fit/object-position CSS properties), clipped to the container's
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// content box (which is what GetBounds() returns). So, we grab those
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// rects and intersect them.
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nsRect constraintRect = GetBounds(aBuilder, aSnap);
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// Need intrinsic size & ratio, for ComputeObjectDestRect:
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nsIntSize canvasSize = f->GetCanvasSize();
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IntrinsicSize intrinsicSize = IntrinsicSizeFromCanvasSize(canvasSize);
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AspectRatio intrinsicRatio = AspectRatio::FromSize(canvasSize);
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const nsRect destRect =
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nsLayoutUtils::ComputeObjectDestRect(constraintRect,
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intrinsicSize, intrinsicRatio,
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f->StylePosition());
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return nsRegion(destRect.Intersect(constraintRect));
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}
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return result;
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}
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virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder,
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bool* aSnap) override {
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*aSnap = true;
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nsHTMLCanvasFrame* f = static_cast<nsHTMLCanvasFrame*>(Frame());
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return f->GetInnerArea() + ToReferenceFrame();
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}
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virtual already_AddRefed<Layer> BuildLayer(nsDisplayListBuilder* aBuilder,
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LayerManager* aManager,
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const ContainerLayerParameters& aContainerParameters) override
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{
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return static_cast<nsHTMLCanvasFrame*>(mFrame)->
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BuildLayer(aBuilder, aManager, this, aContainerParameters);
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}
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virtual LayerState GetLayerState(nsDisplayListBuilder* aBuilder,
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LayerManager* aManager,
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const ContainerLayerParameters& aParameters) override
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{
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if (HTMLCanvasElement::FromContent(mFrame->GetContent())->ShouldForceInactiveLayer(aManager))
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return LAYER_INACTIVE;
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// If compositing is cheap, just do that
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if (aManager->IsCompositingCheap() ||
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ActiveLayerTracker::IsContentActive(mFrame))
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return mozilla::LAYER_ACTIVE;
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return LAYER_INACTIVE;
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}
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};
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nsIFrame*
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NS_NewHTMLCanvasFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
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{
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return new (aPresShell) nsHTMLCanvasFrame(aContext);
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}
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NS_QUERYFRAME_HEAD(nsHTMLCanvasFrame)
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NS_QUERYFRAME_ENTRY(nsHTMLCanvasFrame)
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NS_QUERYFRAME_TAIL_INHERITING(nsContainerFrame)
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NS_IMPL_FRAMEARENA_HELPERS(nsHTMLCanvasFrame)
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void
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nsHTMLCanvasFrame::Init(nsIContent* aContent,
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nsContainerFrame* aParent,
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nsIFrame* aPrevInFlow)
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{
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nsContainerFrame::Init(aContent, aParent, aPrevInFlow);
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// We can fill in the canvas before the canvas frame is created, in
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// which case we never get around to marking the content as active. Therefore,
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// we mark it active here when we create the frame.
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ActiveLayerTracker::NotifyContentChange(this);
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}
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nsHTMLCanvasFrame::~nsHTMLCanvasFrame()
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{
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}
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nsIntSize
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nsHTMLCanvasFrame::GetCanvasSize()
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{
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nsIntSize size(0,0);
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HTMLCanvasElement *canvas =
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HTMLCanvasElement::FromContentOrNull(GetContent());
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if (canvas) {
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size = canvas->GetSize();
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MOZ_ASSERT(size.width >= 0 && size.height >= 0,
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"we should've required <canvas> width/height attrs to be "
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"unsigned (non-negative) values");
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} else {
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NS_NOTREACHED("couldn't get canvas size");
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}
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return size;
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}
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/* virtual */ nscoord
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nsHTMLCanvasFrame::GetMinISize(nsRenderingContext *aRenderingContext)
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{
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// XXX The caller doesn't account for constraints of the height,
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// min-height, and max-height properties.
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bool vertical = GetWritingMode().IsVertical();
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nscoord result = nsPresContext::CSSPixelsToAppUnits(
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vertical ? GetCanvasSize().height : GetCanvasSize().width);
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DISPLAY_MIN_WIDTH(this, result);
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return result;
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}
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/* virtual */ nscoord
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nsHTMLCanvasFrame::GetPrefISize(nsRenderingContext *aRenderingContext)
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{
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// XXX The caller doesn't account for constraints of the height,
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// min-height, and max-height properties.
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bool vertical = GetWritingMode().IsVertical();
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nscoord result = nsPresContext::CSSPixelsToAppUnits(
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vertical ? GetCanvasSize().height : GetCanvasSize().width);
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DISPLAY_PREF_WIDTH(this, result);
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return result;
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}
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/* virtual */ IntrinsicSize
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nsHTMLCanvasFrame::GetIntrinsicSize()
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{
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return IntrinsicSizeFromCanvasSize(GetCanvasSize());
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}
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/* virtual */ AspectRatio
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nsHTMLCanvasFrame::GetIntrinsicRatio()
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{
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// When 'contain: size' is implemented, make sure to check for it.
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/*
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if (StyleDisplay()->IsContainSize()) {
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return AspectRatio();
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}
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*/
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return AspectRatio::FromSize(GetCanvasSize());
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}
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/* virtual */
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LogicalSize
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nsHTMLCanvasFrame::ComputeSize(nsRenderingContext *aRenderingContext,
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WritingMode aWM,
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const LogicalSize& aCBSize,
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nscoord aAvailableISize,
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const LogicalSize& aMargin,
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const LogicalSize& aBorder,
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const LogicalSize& aPadding,
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ComputeSizeFlags aFlags)
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{
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nsIntSize size = GetCanvasSize();
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IntrinsicSize intrinsicSize;
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intrinsicSize.width.SetCoordValue(nsPresContext::CSSPixelsToAppUnits(size.width));
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intrinsicSize.height.SetCoordValue(nsPresContext::CSSPixelsToAppUnits(size.height));
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AspectRatio intrinsicRatio = GetIntrinsicRatio();
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return ComputeSizeWithIntrinsicDimensions(aRenderingContext, aWM,
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intrinsicSize, intrinsicRatio,
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aCBSize, aMargin, aBorder, aPadding,
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aFlags);
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}
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void
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nsHTMLCanvasFrame::Reflow(nsPresContext* aPresContext,
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ReflowOutput& aMetrics,
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const ReflowInput& aReflowInput,
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nsReflowStatus& aStatus)
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{
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MarkInReflow();
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DO_GLOBAL_REFLOW_COUNT("nsHTMLCanvasFrame");
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DISPLAY_REFLOW(aPresContext, this, aReflowInput, aMetrics, aStatus);
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NS_FRAME_TRACE(NS_FRAME_TRACE_CALLS,
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("enter nsHTMLCanvasFrame::Reflow: availSize=%d,%d",
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aReflowInput.AvailableWidth(), aReflowInput.AvailableHeight()));
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NS_PRECONDITION(mState & NS_FRAME_IN_REFLOW, "frame is not in reflow");
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aStatus = NS_FRAME_COMPLETE;
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WritingMode wm = aReflowInput.GetWritingMode();
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LogicalSize finalSize(wm,
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aReflowInput.ComputedISize(),
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aReflowInput.ComputedBSize());
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// stash this away so we can compute our inner area later
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mBorderPadding = aReflowInput.ComputedLogicalBorderPadding();
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finalSize.ISize(wm) += mBorderPadding.IStartEnd(wm);
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finalSize.BSize(wm) += mBorderPadding.BStartEnd(wm);
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if (GetPrevInFlow()) {
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nscoord y = GetContinuationOffset(&finalSize.ISize(wm));
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finalSize.BSize(wm) -= y + mBorderPadding.BStart(wm);
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finalSize.BSize(wm) = std::max(0, finalSize.BSize(wm));
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}
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aMetrics.SetSize(wm, finalSize);
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aMetrics.SetOverflowAreasToDesiredBounds();
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FinishAndStoreOverflow(&aMetrics);
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// Reflow the single anon block child.
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nsReflowStatus childStatus;
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nsIFrame* childFrame = mFrames.FirstChild();
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WritingMode childWM = childFrame->GetWritingMode();
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LogicalSize availSize = aReflowInput.ComputedSize(childWM);
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availSize.BSize(childWM) = NS_UNCONSTRAINEDSIZE;
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NS_ASSERTION(!childFrame->GetNextSibling(), "HTML canvas should have 1 kid");
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ReflowOutput childDesiredSize(aReflowInput.GetWritingMode(), aMetrics.mFlags);
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ReflowInput childReflowInput(aPresContext, aReflowInput, childFrame,
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availSize);
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ReflowChild(childFrame, aPresContext, childDesiredSize, childReflowInput,
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0, 0, 0, childStatus, nullptr);
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FinishReflowChild(childFrame, aPresContext, childDesiredSize,
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&childReflowInput, 0, 0, 0);
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NS_FRAME_TRACE(NS_FRAME_TRACE_CALLS,
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("exit nsHTMLCanvasFrame::Reflow: size=%d,%d",
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aMetrics.ISize(wm), aMetrics.BSize(wm)));
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NS_FRAME_SET_TRUNCATION(aStatus, aReflowInput, aMetrics);
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}
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// FIXME taken from nsImageFrame, but then had splittable frame stuff
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// removed. That needs to be fixed.
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// XXXdholbert As in nsImageFrame, this function's clients should probably
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// just be calling GetContentRectRelativeToSelf().
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nsRect
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nsHTMLCanvasFrame::GetInnerArea() const
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{
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nsMargin bp = mBorderPadding.GetPhysicalMargin(GetWritingMode());
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nsRect r;
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r.x = bp.left;
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r.y = bp.top;
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r.width = mRect.width - bp.left - bp.right;
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r.height = mRect.height - bp.top - bp.bottom;
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return r;
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}
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already_AddRefed<Layer>
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nsHTMLCanvasFrame::BuildLayer(nsDisplayListBuilder* aBuilder,
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LayerManager* aManager,
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nsDisplayItem* aItem,
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const ContainerLayerParameters& aContainerParameters)
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{
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nsRect area = GetContentRectRelativeToSelf() + aItem->ToReferenceFrame();
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HTMLCanvasElement* element = static_cast<HTMLCanvasElement*>(GetContent());
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nsIntSize canvasSizeInPx = GetCanvasSize();
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nsPresContext* presContext = PresContext();
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element->HandlePrintCallback(presContext->Type());
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if (canvasSizeInPx.width <= 0 || canvasSizeInPx.height <= 0 || area.IsEmpty())
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return nullptr;
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CanvasLayer* oldLayer = static_cast<CanvasLayer*>
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(aManager->GetLayerBuilder()->GetLeafLayerFor(aBuilder, aItem));
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RefPtr<Layer> layer = element->GetCanvasLayer(aBuilder, oldLayer, aManager);
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if (!layer)
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return nullptr;
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IntrinsicSize intrinsicSize = IntrinsicSizeFromCanvasSize(canvasSizeInPx);
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AspectRatio intrinsicRatio = AspectRatio::FromSize(canvasSizeInPx);
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nsRect dest =
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nsLayoutUtils::ComputeObjectDestRect(area, intrinsicSize, intrinsicRatio,
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StylePosition());
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gfxRect destGFXRect = presContext->AppUnitsToGfxUnits(dest);
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// Transform the canvas into the right place
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gfxPoint p = destGFXRect.TopLeft() + aContainerParameters.mOffset;
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Matrix transform = Matrix::Translation(p.x, p.y);
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transform.PreScale(destGFXRect.Width() / canvasSizeInPx.width,
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destGFXRect.Height() / canvasSizeInPx.height);
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layer->SetBaseTransform(gfx::Matrix4x4::From2D(transform));
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if (layer->GetType() == layers::Layer::TYPE_CANVAS) {
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RefPtr<CanvasLayer> canvasLayer = static_cast<CanvasLayer*>(layer.get());
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canvasLayer->SetSamplingFilter(nsLayoutUtils::GetSamplingFilterForFrame(this));
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} else if (layer->GetType() == layers::Layer::TYPE_IMAGE) {
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RefPtr<ImageLayer> imageLayer = static_cast<ImageLayer*>(layer.get());
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imageLayer->SetSamplingFilter(nsLayoutUtils::GetSamplingFilterForFrame(this));
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}
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return layer.forget();
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}
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void
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nsHTMLCanvasFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
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const nsDisplayListSet& aLists)
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{
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if (!IsVisibleForPainting(aBuilder))
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return;
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DisplayBorderBackgroundOutline(aBuilder, aLists);
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uint32_t clipFlags =
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nsStyleUtil::ObjectPropsMightCauseOverflow(StylePosition()) ?
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0 : DisplayListClipState::ASSUME_DRAWING_RESTRICTED_TO_CONTENT_RECT;
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DisplayListClipState::AutoClipContainingBlockDescendantsToContentBox
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clip(aBuilder, this, clipFlags);
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aLists.Content()->AppendNewToTop(
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new (aBuilder) nsDisplayCanvas(aBuilder, this));
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DisplaySelectionOverlay(aBuilder, aLists.Content(),
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nsISelectionDisplay::DISPLAY_IMAGES);
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}
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nsIAtom*
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nsHTMLCanvasFrame::GetType() const
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{
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return nsGkAtoms::HTMLCanvasFrame;
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}
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// get the offset into the content area of the image where aImg starts if it is a continuation.
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// from nsImageFrame
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nscoord
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nsHTMLCanvasFrame::GetContinuationOffset(nscoord* aWidth) const
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{
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nscoord offset = 0;
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if (aWidth) {
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*aWidth = 0;
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}
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if (GetPrevInFlow()) {
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for (nsIFrame* prevInFlow = GetPrevInFlow() ; prevInFlow; prevInFlow = prevInFlow->GetPrevInFlow()) {
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nsRect rect = prevInFlow->GetRect();
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if (aWidth) {
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*aWidth = rect.width;
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}
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offset += rect.height;
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}
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offset -= mBorderPadding.GetPhysicalMargin(GetWritingMode()).top;
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offset = std::max(0, offset);
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}
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return offset;
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}
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#ifdef ACCESSIBILITY
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a11y::AccType
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nsHTMLCanvasFrame::AccessibleType()
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{
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return a11y::eHTMLCanvasType;
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}
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#endif
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#ifdef DEBUG_FRAME_DUMP
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nsresult
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nsHTMLCanvasFrame::GetFrameName(nsAString& aResult) const
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{
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return MakeFrameName(NS_LITERAL_STRING("HTMLCanvas"), aResult);
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}
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#endif
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