mirror of
https://github.com/mozilla/gecko-dev.git
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364 lines
12 KiB
C++
364 lines
12 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 "nsHTMLParts.h"
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#include "nsCOMPtr.h"
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#include "nsIServiceManager.h"
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#include "nsGkAtoms.h"
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#include "nsHTMLCanvasFrame.h"
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#include "nsHTMLCanvasElement.h"
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#include "nsDisplayList.h"
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#include "nsLayoutUtils.h"
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#include "Layers.h"
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#include "nsTransform2D.h"
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#include "gfxContext.h"
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#ifdef ACCESSIBILITY
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#include "nsAccessibilityService.h"
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#endif
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using namespace mozilla;
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using namespace mozilla::layers;
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static nsHTMLCanvasElement *
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CanvasElementFromContent(nsIContent *content)
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{
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nsCOMPtr<nsIDOMHTMLCanvasElement> domCanvas(do_QueryInterface(content));
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return domCanvas ? static_cast<nsHTMLCanvasElement*>(domCanvas.get()) : nullptr;
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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) {
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*aSnap = false;
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nsIFrame* f = GetUnderlyingFrame();
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nsHTMLCanvasElement *canvas = CanvasElementFromContent(f->GetContent());
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nsRegion result;
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if (canvas->GetIsOpaque()) {
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result = GetBounds(aBuilder, aSnap);
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}
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return result;
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}
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virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap) {
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*aSnap = false;
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nsHTMLCanvasFrame* f = static_cast<nsHTMLCanvasFrame*>(GetUnderlyingFrame());
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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 ContainerParameters& aContainerParameters)
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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 FrameLayerBuilder::ContainerParameters& aParameters)
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{
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if (CanvasElementFromContent(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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return mozilla::LAYER_ACTIVE;
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return mFrame->AreLayersMarkedActive() ? LAYER_ACTIVE : 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_IMPL_FRAMEARENA_HELPERS(nsHTMLCanvasFrame)
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NS_IMETHODIMP
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nsHTMLCanvasFrame::Init(nsIContent* aContent,
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nsIFrame* aParent,
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nsIFrame* aPrevInFlow)
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{
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nsresult rv = nsSplittableFrame::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 layer active. Therefore,
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// we mark it active here when we create the frame.
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MarkLayersActive(nsChangeHint(0));
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return rv;
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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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nsHTMLCanvasElement *canvas = CanvasElementFromContent(GetContent());
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if (canvas) {
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size = canvas->GetSize();
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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::GetMinWidth(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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nscoord result = nsPresContext::CSSPixelsToAppUnits(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::GetPrefWidth(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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nscoord result = nsPresContext::CSSPixelsToAppUnits(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 */ nsSize
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nsHTMLCanvasFrame::GetIntrinsicRatio()
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{
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nsIntSize size(GetCanvasSize());
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return nsSize(nsPresContext::CSSPixelsToAppUnits(size.width),
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nsPresContext::CSSPixelsToAppUnits(size.height));
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}
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/* virtual */ nsSize
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nsHTMLCanvasFrame::ComputeSize(nsRenderingContext *aRenderingContext,
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nsSize aCBSize, nscoord aAvailableWidth,
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nsSize aMargin, nsSize aBorder, nsSize aPadding,
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uint32_t 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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nsSize intrinsicRatio = GetIntrinsicRatio(); // won't actually be used
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return nsLayoutUtils::ComputeSizeWithIntrinsicDimensions(
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aRenderingContext, this,
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intrinsicSize, intrinsicRatio, aCBSize,
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aMargin, aBorder, aPadding);
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}
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NS_IMETHODIMP
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nsHTMLCanvasFrame::Reflow(nsPresContext* aPresContext,
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nsHTMLReflowMetrics& aMetrics,
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const nsHTMLReflowState& aReflowState,
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nsReflowStatus& aStatus)
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{
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DO_GLOBAL_REFLOW_COUNT("nsHTMLCanvasFrame");
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DISPLAY_REFLOW(aPresContext, this, aReflowState, 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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aReflowState.availableWidth, aReflowState.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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aMetrics.width = aReflowState.ComputedWidth();
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aMetrics.height = aReflowState.ComputedHeight();
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// stash this away so we can compute our inner area later
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mBorderPadding = aReflowState.mComputedBorderPadding;
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aMetrics.width += mBorderPadding.left + mBorderPadding.right;
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aMetrics.height += mBorderPadding.top + mBorderPadding.bottom;
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if (GetPrevInFlow()) {
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nscoord y = GetContinuationOffset(&aMetrics.width);
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aMetrics.height -= y + mBorderPadding.top;
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aMetrics.height = NS_MAX(0, aMetrics.height);
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}
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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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nsSize availSize(aReflowState.ComputedWidth(), NS_UNCONSTRAINEDSIZE);
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nsIFrame* childFrame = mFrames.FirstChild();
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NS_ASSERTION(!childFrame->GetNextSibling(), "HTML canvas should have 1 kid");
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nsHTMLReflowMetrics childDesiredSize(aMetrics.mFlags);
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nsHTMLReflowState childReflowState(aPresContext, aReflowState, childFrame,
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availSize);
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ReflowChild(childFrame, aPresContext, childDesiredSize, childReflowState,
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0, 0, 0, childStatus, nullptr);
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FinishReflowChild(childFrame, aPresContext, &childReflowState,
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childDesiredSize, 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.width, aMetrics.height));
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NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aMetrics);
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return NS_OK;
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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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nsRect
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nsHTMLCanvasFrame::GetInnerArea() const
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{
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nsRect r;
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r.x = mBorderPadding.left;
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r.y = mBorderPadding.top;
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r.width = mRect.width - mBorderPadding.left - mBorderPadding.right;
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r.height = mRect.height - mBorderPadding.top - mBorderPadding.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 ContainerParameters& aContainerParameters)
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{
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nsRect area = GetContentRect() - GetPosition() + aItem->ToReferenceFrame();
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nsHTMLCanvasElement* element = static_cast<nsHTMLCanvasElement*>(GetContent());
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nsIntSize canvasSize = GetCanvasSize();
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nsPresContext* presContext = PresContext();
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element->HandlePrintCallback(presContext->Type());
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if (canvasSize.width <= 0 || canvasSize.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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nsRefPtr<CanvasLayer> layer = element->GetCanvasLayer(aBuilder, oldLayer, aManager);
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if (!layer)
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return nullptr;
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gfxRect r = gfxRect(presContext->AppUnitsToGfxUnits(area.x),
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presContext->AppUnitsToGfxUnits(area.y),
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presContext->AppUnitsToGfxUnits(area.width),
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presContext->AppUnitsToGfxUnits(area.height));
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// Transform the canvas into the right place
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gfxMatrix transform;
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transform.Translate(r.TopLeft() + aContainerParameters.mOffset);
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transform.Scale(r.Width()/canvasSize.width, r.Height()/canvasSize.height);
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layer->SetBaseTransform(gfx3DMatrix::From2D(transform));
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layer->SetFilter(nsLayoutUtils::GetGraphicsFilterForFrame(this));
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layer->SetVisibleRegion(nsIntRect(0, 0, canvasSize.width, canvasSize.height));
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return layer.forget();
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}
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NS_IMETHODIMP
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nsHTMLCanvasFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
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const nsRect& aDirtyRect,
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const nsDisplayListSet& aLists)
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{
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if (!IsVisibleForPainting(aBuilder))
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return NS_OK;
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nsresult rv = DisplayBorderBackgroundOutline(aBuilder, aLists);
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NS_ENSURE_SUCCESS(rv, rv);
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nsDisplayList replacedContent;
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rv = replacedContent.AppendNewToTop(
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new (aBuilder) nsDisplayCanvas(aBuilder, this));
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NS_ENSURE_SUCCESS(rv, rv);
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rv = DisplaySelectionOverlay(aBuilder, &replacedContent,
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nsISelectionDisplay::DISPLAY_IMAGES);
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NS_ENSURE_SUCCESS(rv, rv);
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WrapReplacedContentForBorderRadius(aBuilder, &replacedContent, aLists);
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return NS_OK;
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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.top;
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offset = NS_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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already_AddRefed<Accessible>
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nsHTMLCanvasFrame::CreateAccessible()
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{
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nsAccessibilityService* accService = nsIPresShell::AccService();
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if (accService) {
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return accService->CreateHTMLCanvasAccessible(mContent, PresContext()->PresShell());
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}
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return nullptr;
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}
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#endif
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#ifdef DEBUG
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NS_IMETHODIMP
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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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