mirror of
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340 lines
11 KiB
C++
340 lines
11 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Vladimir Vukicevic <vladimir@pobox.com>
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* Portions created by the Initial Developer are Copyright (C) 2004
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Vladimir Vukicevic <vladimir@pobox.com> (original author)
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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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 "nsTransform2D.h"
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#include "gfxContext.h"
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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()) : nsnull;
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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 PRBool IsOpaque(nsDisplayListBuilder* aBuilder) {
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nsIFrame* f = GetUnderlyingFrame();
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nsHTMLCanvasElement *canvas = CanvasElementFromContent(f->GetContent());
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return canvas->GetIsOpaque();
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}
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virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder) {
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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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{
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return static_cast<nsHTMLCanvasFrame*>(mFrame)->
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BuildLayer(aBuilder, aManager, this);
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}
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virtual LayerState GetLayerState(nsDisplayListBuilder* aBuilder,
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LayerManager* aManager)
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{
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// XXX we should have some kind of activity timeout here so that
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// inactive canvases can be composited into the background
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return mozilla::LAYER_ACTIVE;
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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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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(nsIRenderingContext *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(nsIRenderingContext *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(nsIRenderingContext *aRenderingContext,
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nsSize aCBSize, nscoord aAvailableWidth,
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nsSize aMargin, nsSize aBorder, nsSize aPadding,
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PRBool aShrinkWrap)
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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.mOverflowArea.SetRect(0, 0, aMetrics.width, aMetrics.height);
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FinishAndStoreOverflow(&aMetrics);
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if (mRect.width != aMetrics.width || mRect.height != aMetrics.height) {
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Invalidate(nsRect(0, 0, mRect.width, mRect.height));
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}
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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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{
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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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if (canvasSize.width <= 0 || canvasSize.height <= 0 || area.IsEmpty())
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return nsnull;
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CanvasLayer* oldLayer = static_cast<CanvasLayer*>
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(aBuilder->LayerBuilder()->GetLeafLayerFor(aBuilder, aManager, aItem));
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nsRefPtr<CanvasLayer> layer = element->GetCanvasLayer(oldLayer, aManager);
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if (!layer)
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return nsnull;
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element->MarkContextClean();
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nsPresContext* presContext = PresContext();
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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.pos);
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transform.Scale(r.Width()/canvasSize.width, r.Height()/canvasSize.height);
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layer->SetTransform(gfx3DMatrix::From2D(transform));
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layer->SetFilter(nsLayoutUtils::GetGraphicsFilterForFrame(this));
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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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rv = aLists.Content()->AppendNewToTop(
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new (aBuilder) nsDisplayCanvas(aBuilder, this));
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NS_ENSURE_SUCCESS(rv, rv);
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return DisplaySelectionOverlay(aBuilder, aLists,
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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.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<nsAccessible>
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nsHTMLCanvasFrame::CreateAccessible()
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{
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return nsnull;
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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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