gecko/layout/svg/base/src/nsSVGInnerSVGFrame.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is the Mozilla SVG project.
*
* The Initial Developer of the Original Code is
* Crocodile Clips Ltd..
* Portions created by the Initial Developer are Copyright (C) 2001
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Alex Fritze <alex.fritze@crocodile-clips.com> (original author)
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsSVGInnerSVGFrame.h"
#include "nsIFrame.h"
#include "nsISVGChildFrame.h"
#include "nsIDOMSVGAnimatedRect.h"
#include "nsSVGSVGElement.h"
#include "nsSVGContainerFrame.h"
#include "gfxContext.h"
nsIFrame*
NS_NewSVGInnerSVGFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) nsSVGInnerSVGFrame(aContext);
}
NS_IMPL_FRAMEARENA_HELPERS(nsSVGInnerSVGFrame)
//----------------------------------------------------------------------
// nsIFrame methods
NS_QUERYFRAME_HEAD(nsSVGInnerSVGFrame)
NS_QUERYFRAME_ENTRY(nsSVGInnerSVGFrame)
NS_QUERYFRAME_ENTRY(nsISVGSVGFrame)
NS_QUERYFRAME_TAIL_INHERITING(nsSVGInnerSVGFrameBase)
#ifdef DEBUG
NS_IMETHODIMP
nsSVGInnerSVGFrame::Init(nsIContent* aContent,
nsIFrame* aParent,
nsIFrame* aPrevInFlow)
{
nsCOMPtr<nsIDOMSVGSVGElement> svg = do_QueryInterface(aContent);
NS_ASSERTION(svg, "Content is not an SVG 'svg' element!");
return nsSVGInnerSVGFrameBase::Init(aContent, aParent, aPrevInFlow);
}
#endif /* DEBUG */
nsIAtom *
nsSVGInnerSVGFrame::GetType() const
{
return nsGkAtoms::svgInnerSVGFrame;
}
//----------------------------------------------------------------------
// nsISVGChildFrame methods
NS_IMETHODIMP
nsSVGInnerSVGFrame::PaintSVG(nsRenderingContext *aContext,
const nsIntRect *aDirtyRect)
{
gfxContextAutoSaveRestore autoSR;
if (GetStyleDisplay()->IsScrollableOverflow()) {
float x, y, width, height;
static_cast<nsSVGSVGElement*>(mContent)->
GetAnimatedLengthValues(&x, &y, &width, &height, nsnull);
if (width <= 0 || height <= 0) {
return NS_OK;
}
nsSVGContainerFrame *parent = static_cast<nsSVGContainerFrame*>(mParent);
gfxMatrix clipTransform = parent->GetCanvasTM();
gfxContext *gfx = aContext->ThebesContext();
autoSR.SetContext(gfx);
gfxRect clipRect =
nsSVGUtils::GetClipRectForFrame(this, x, y, width, height);
nsSVGUtils::SetClipRect(gfx, clipTransform, clipRect);
}
return nsSVGInnerSVGFrameBase::PaintSVG(aContext, aDirtyRect);
}
void
nsSVGInnerSVGFrame::NotifySVGChanged(PRUint32 aFlags)
{
if (aFlags & COORD_CONTEXT_CHANGED) {
nsSVGSVGElement *svg = static_cast<nsSVGSVGElement*>(mContent);
// Coordinate context changes affect mCanvasTM if we have a
// percentage 'x' or 'y', or if we have a percentage 'width' or 'height' AND
// a 'viewBox'.
if (!(aFlags & TRANSFORM_CHANGED) &&
(svg->mLengthAttributes[nsSVGSVGElement::X].IsPercentage() ||
svg->mLengthAttributes[nsSVGSVGElement::Y].IsPercentage() ||
(svg->mViewBox.IsValid() &&
(svg->mLengthAttributes[nsSVGSVGElement::WIDTH].IsPercentage() ||
svg->mLengthAttributes[nsSVGSVGElement::HEIGHT].IsPercentage())))) {
aFlags |= TRANSFORM_CHANGED;
}
// XXX We could clear the COORD_CONTEXT_CHANGED flag in some circumstances
// if we have a non-percentage 'width' AND 'height, or if we have a 'viewBox'
// rect. This is because, when we have a viewBox rect, the viewBox rect
// is the coordinate context for our children, and it isn't changing.
// Percentage lengths on our children will continue to resolve to the
// same number of user units because they're relative to our viewBox rect. The
// same is true if we have a non-percentage width and height and don't have a
// viewBox. We (the <svg>) establish the coordinate context for our children. Our
// children don't care about changes to our parent coordinate context unless that
// change results in a change to the coordinate context that _we_ establish. Hence
// we can (should, really) stop propagating COORD_CONTEXT_CHANGED in these cases.
// We'd actually need to check that we have a viewBox rect and not just
// that viewBox is set, since it could be set to none.
// Take care not to break the testcase for bug 394463 when implementing this
}
if (aFlags & TRANSFORM_CHANGED) {
// make sure our cached transform matrix gets (lazily) updated
mCanvasTM = nsnull;
}
nsSVGInnerSVGFrameBase::NotifySVGChanged(aFlags);
}
NS_IMETHODIMP
nsSVGInnerSVGFrame::AttributeChanged(PRInt32 aNameSpaceID,
nsIAtom* aAttribute,
PRInt32 aModType)
{
if (aNameSpaceID == kNameSpaceID_None) {
if (aAttribute == nsGkAtoms::width ||
aAttribute == nsGkAtoms::height) {
nsSVGSVGElement* svg = static_cast<nsSVGSVGElement*>(mContent);
if (svg->mViewBox.IsValid()) {
// make sure our cached transform matrix gets (lazily) updated
mCanvasTM = nsnull;
nsSVGUtils::NotifyChildrenOfSVGChange(this, TRANSFORM_CHANGED);
} else {
PRUint32 flags = COORD_CONTEXT_CHANGED;
if (mCanvasTM && mCanvasTM->IsSingular()) {
mCanvasTM = nsnull;
flags |= TRANSFORM_CHANGED;
}
nsSVGUtils::NotifyChildrenOfSVGChange(this, flags);
}
} else if (aAttribute == nsGkAtoms::transform ||
aAttribute == nsGkAtoms::preserveAspectRatio ||
aAttribute == nsGkAtoms::viewBox ||
aAttribute == nsGkAtoms::x ||
aAttribute == nsGkAtoms::y) {
// make sure our cached transform matrix gets (lazily) updated
mCanvasTM = nsnull;
nsSVGUtils::NotifyChildrenOfSVGChange(
this, aAttribute == nsGkAtoms::viewBox ?
TRANSFORM_CHANGED | COORD_CONTEXT_CHANGED : TRANSFORM_CHANGED);
}
}
return NS_OK;
}
NS_IMETHODIMP_(nsIFrame*)
nsSVGInnerSVGFrame::GetFrameForPoint(const nsPoint &aPoint)
{
if (GetStyleDisplay()->IsScrollableOverflow()) {
nsSVGElement *content = static_cast<nsSVGElement*>(mContent);
nsSVGContainerFrame *parent = static_cast<nsSVGContainerFrame*>(mParent);
float clipX, clipY, clipWidth, clipHeight;
content->GetAnimatedLengthValues(&clipX, &clipY, &clipWidth, &clipHeight, nsnull);
if (!nsSVGUtils::HitTestRect(parent->GetCanvasTM(),
clipX, clipY, clipWidth, clipHeight,
PresContext()->AppUnitsToDevPixels(aPoint.x),
PresContext()->AppUnitsToDevPixels(aPoint.y))) {
return nsnull;
}
}
return nsSVGInnerSVGFrameBase::GetFrameForPoint(aPoint);
}
//----------------------------------------------------------------------
// nsISVGSVGFrame methods:
void
nsSVGInnerSVGFrame::SuspendRedraw()
{
if (GetParent()->GetStateBits() & NS_STATE_SVG_REDRAW_SUSPENDED)
return;
nsSVGUtils::NotifyRedrawSuspended(this);
}
void
nsSVGInnerSVGFrame::UnsuspendRedraw()
{
if (GetParent()->GetStateBits() & NS_STATE_SVG_REDRAW_SUSPENDED)
return;
nsSVGUtils::NotifyRedrawUnsuspended(this);
}
void
nsSVGInnerSVGFrame::NotifyViewportChange()
{
NS_ERROR("Inner SVG frames should not get Viewport changes.");
}
//----------------------------------------------------------------------
// nsSVGContainerFrame methods:
gfxMatrix
nsSVGInnerSVGFrame::GetCanvasTM()
{
if (!mCanvasTM) {
NS_ASSERTION(mParent, "null parent");
nsSVGContainerFrame *parent = static_cast<nsSVGContainerFrame*>(mParent);
nsSVGSVGElement *content = static_cast<nsSVGSVGElement*>(mContent);
gfxMatrix tm = content->PrependLocalTransformsTo(parent->GetCanvasTM());
mCanvasTM = new gfxMatrix(tm);
}
return *mCanvasTM;
}