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gecko/layout/svg/nsSVGImageFrame.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
// Keep in (case-insensitive) order:
#include "gfxContext.h"
#include "gfxMatrix.h"
#include "gfxPlatform.h"
#include "imgIContainer.h"
#include "nsIImageLoadingContent.h"
#include "nsLayoutUtils.h"
#include "nsRenderingContext.h"
#include "imgINotificationObserver.h"
#include "nsSVGEffects.h"
#include "nsSVGPathGeometryFrame.h"
#include "mozilla/dom/SVGSVGElement.h"
#include "nsSVGUtils.h"
#include "SVGContentUtils.h"
#include "SVGImageContext.h"
#include "mozilla/dom/SVGImageElement.h"
#include "nsContentUtils.h"
using namespace mozilla;
using namespace mozilla::dom;
class nsSVGImageFrame;
class nsSVGImageListener MOZ_FINAL : public imgINotificationObserver
{
public:
nsSVGImageListener(nsSVGImageFrame *aFrame);
NS_DECL_ISUPPORTS
NS_DECL_IMGINOTIFICATIONOBSERVER
void SetFrame(nsSVGImageFrame *frame) { mFrame = frame; }
private:
nsSVGImageFrame *mFrame;
};
typedef nsSVGPathGeometryFrame nsSVGImageFrameBase;
class nsSVGImageFrame : public nsSVGImageFrameBase
{
friend nsIFrame*
NS_NewSVGImageFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
protected:
nsSVGImageFrame(nsStyleContext* aContext) : nsSVGImageFrameBase(aContext) {}
virtual ~nsSVGImageFrame();
public:
NS_DECL_FRAMEARENA_HELPERS
// nsISVGChildFrame interface:
NS_IMETHOD PaintSVG(nsRenderingContext *aContext, const nsIntRect *aDirtyRect);
NS_IMETHOD_(nsIFrame*) GetFrameForPoint(const nsPoint &aPoint);
virtual void ReflowSVG();
// nsSVGPathGeometryFrame methods:
virtual uint16_t GetHitTestFlags();
// nsIFrame interface:
NS_IMETHOD AttributeChanged(int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType);
NS_IMETHOD Init(nsIContent* aContent,
nsIFrame* aParent,
nsIFrame* aPrevInFlow);
virtual void DestroyFrom(nsIFrame* aDestructRoot);
/**
* Get the "type" of the frame
*
* @see nsGkAtoms::svgImageFrame
*/
virtual nsIAtom* GetType() const;
#ifdef DEBUG
NS_IMETHOD GetFrameName(nsAString& aResult) const
{
return MakeFrameName(NS_LITERAL_STRING("SVGImage"), aResult);
}
#endif
private:
gfxMatrix GetRasterImageTransform(int32_t aNativeWidth,
int32_t aNativeHeight,
uint32_t aFor);
gfxMatrix GetVectorImageTransform(uint32_t aFor);
bool TransformContextForPainting(gfxContext* aGfxContext);
nsCOMPtr<imgINotificationObserver> mListener;
nsCOMPtr<imgIContainer> mImageContainer;
friend class nsSVGImageListener;
};
//----------------------------------------------------------------------
// Implementation
nsIFrame*
NS_NewSVGImageFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) nsSVGImageFrame(aContext);
}
NS_IMPL_FRAMEARENA_HELPERS(nsSVGImageFrame)
nsSVGImageFrame::~nsSVGImageFrame()
{
// set the frame to null so we don't send messages to a dead object.
if (mListener) {
nsCOMPtr<nsIImageLoadingContent> imageLoader = do_QueryInterface(mContent);
if (imageLoader) {
// Push a null JSContext on the stack so that code that runs
// within the below code doesn't think it's being called by
// JS. See bug 604262.
nsCxPusher pusher;
pusher.PushNull();
imageLoader->RemoveObserver(mListener);
}
reinterpret_cast<nsSVGImageListener*>(mListener.get())->SetFrame(nullptr);
}
mListener = nullptr;
}
NS_IMETHODIMP
nsSVGImageFrame::Init(nsIContent* aContent,
nsIFrame* aParent,
nsIFrame* aPrevInFlow)
{
NS_ASSERTION(aContent->IsSVG(nsGkAtoms::image),
"Content is not an SVG image!");
nsresult rv = nsSVGImageFrameBase::Init(aContent, aParent, aPrevInFlow);
if (NS_FAILED(rv)) return rv;
mListener = new nsSVGImageListener(this);
if (!mListener) return NS_ERROR_OUT_OF_MEMORY;
nsCOMPtr<nsIImageLoadingContent> imageLoader = do_QueryInterface(mContent);
NS_ENSURE_TRUE(imageLoader, NS_ERROR_UNEXPECTED);
// We should have a PresContext now, so let's notify our image loader that
// we need to register any image animations with the refresh driver.
imageLoader->FrameCreated(this);
// Push a null JSContext on the stack so that code that runs within
// the below code doesn't think it's being called by JS. See bug
// 604262.
nsCxPusher pusher;
pusher.PushNull();
imageLoader->AddObserver(mListener);
return NS_OK;
}
/* virtual */ void
nsSVGImageFrame::DestroyFrom(nsIFrame* aDestructRoot)
{
nsCOMPtr<nsIImageLoadingContent> imageLoader =
do_QueryInterface(nsFrame::mContent);
if (imageLoader) {
imageLoader->FrameDestroyed(this);
}
nsFrame::DestroyFrom(aDestructRoot);
}
//----------------------------------------------------------------------
// nsIFrame methods:
NS_IMETHODIMP
nsSVGImageFrame::AttributeChanged(int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType)
{
if (aNameSpaceID == kNameSpaceID_None) {
if (aAttribute == nsGkAtoms::x ||
aAttribute == nsGkAtoms::y ||
aAttribute == nsGkAtoms::width ||
aAttribute == nsGkAtoms::height) {
nsSVGUtils::InvalidateBounds(this, false);
nsSVGUtils::ScheduleReflowSVG(this);
return NS_OK;
}
else if (aAttribute == nsGkAtoms::preserveAspectRatio) {
nsSVGUtils::InvalidateBounds(this);
return NS_OK;
}
}
if (aNameSpaceID == kNameSpaceID_XLink &&
aAttribute == nsGkAtoms::href) {
// Prevent setting image.src by exiting early
if (nsContentUtils::IsImageSrcSetDisabled()) {
return NS_OK;
}
SVGImageElement *element = static_cast<SVGImageElement*>(mContent);
if (element->mStringAttributes[SVGImageElement::HREF].IsExplicitlySet()) {
element->LoadSVGImage(true, true);
} else {
element->CancelImageRequests(true);
}
}
return nsSVGImageFrameBase::AttributeChanged(aNameSpaceID,
aAttribute, aModType);
}
gfxMatrix
nsSVGImageFrame::GetRasterImageTransform(int32_t aNativeWidth,
int32_t aNativeHeight,
uint32_t aFor)
{
float x, y, width, height;
SVGImageElement *element = static_cast<SVGImageElement*>(mContent);
element->GetAnimatedLengthValues(&x, &y, &width, &height, nullptr);
gfxMatrix viewBoxTM =
SVGContentUtils::GetViewBoxTransform(element,
width, height,
0, 0, aNativeWidth, aNativeHeight,
element->mPreserveAspectRatio);
return viewBoxTM * gfxMatrix().Translate(gfxPoint(x, y)) * GetCanvasTM(aFor);
}
gfxMatrix
nsSVGImageFrame::GetVectorImageTransform(uint32_t aFor)
{
float x, y, width, height;
SVGImageElement *element = static_cast<SVGImageElement*>(mContent);
element->GetAnimatedLengthValues(&x, &y, &width, &height, nullptr);
// No viewBoxTM needed here -- our height/width overrides any concept of
// "native size" that the SVG image has, and it will handle viewBox and
// preserveAspectRatio on its own once we give it a region to draw into.
return gfxMatrix().Translate(gfxPoint(x, y)) * GetCanvasTM(aFor);
}
bool
nsSVGImageFrame::TransformContextForPainting(gfxContext* aGfxContext)
{
gfxMatrix imageTransform;
if (mImageContainer->GetType() == imgIContainer::TYPE_VECTOR) {
imageTransform = GetVectorImageTransform(FOR_PAINTING);
} else {
int32_t nativeWidth, nativeHeight;
if (NS_FAILED(mImageContainer->GetWidth(&nativeWidth)) ||
NS_FAILED(mImageContainer->GetHeight(&nativeHeight)) ||
nativeWidth == 0 || nativeHeight == 0) {
return false;
}
imageTransform =
GetRasterImageTransform(nativeWidth, nativeHeight, FOR_PAINTING);
}
if (imageTransform.IsSingular()) {
return false;
}
// NOTE: We need to cancel out the effects of Full-Page-Zoom, or else
// it'll get applied an extra time by DrawSingleUnscaledImage.
nscoord appUnitsPerDevPx = PresContext()->AppUnitsPerDevPixel();
gfxFloat pageZoomFactor =
nsPresContext::AppUnitsToFloatCSSPixels(appUnitsPerDevPx);
aGfxContext->Multiply(imageTransform.Scale(pageZoomFactor, pageZoomFactor));
return true;
}
//----------------------------------------------------------------------
// nsISVGChildFrame methods:
NS_IMETHODIMP
nsSVGImageFrame::PaintSVG(nsRenderingContext *aContext,
const nsIntRect *aDirtyRect)
{
nsresult rv = NS_OK;
if (!StyleVisibility()->IsVisible())
return NS_OK;
float x, y, width, height;
SVGImageElement *imgElem = static_cast<SVGImageElement*>(mContent);
imgElem->GetAnimatedLengthValues(&x, &y, &width, &height, nullptr);
NS_ASSERTION(width > 0 && height > 0,
"Should only be painting things with valid width/height");
if (!mImageContainer) {
nsCOMPtr<imgIRequest> currentRequest;
nsCOMPtr<nsIImageLoadingContent> imageLoader = do_QueryInterface(mContent);
if (imageLoader)
imageLoader->GetRequest(nsIImageLoadingContent::CURRENT_REQUEST,
getter_AddRefs(currentRequest));
if (currentRequest)
currentRequest->GetImage(getter_AddRefs(mImageContainer));
}
if (mImageContainer) {
gfxContext* ctx = aContext->ThebesContext();
gfxContextAutoSaveRestore autoRestorer(ctx);
if (StyleDisplay()->IsScrollableOverflow()) {
gfxRect clipRect = nsSVGUtils::GetClipRectForFrame(this, x, y,
width, height);
nsSVGUtils::SetClipRect(ctx, GetCanvasTM(FOR_PAINTING), clipRect);
}
if (!TransformContextForPainting(ctx)) {
return NS_ERROR_FAILURE;
}
// fill-opacity doesn't affect <image>, so if we're allowed to
// optimize group opacity, the opacity used for compositing the
// image into the current canvas is just the group opacity.
float opacity = 1.0f;
if (nsSVGUtils::CanOptimizeOpacity(this)) {
opacity = StyleDisplay()->mOpacity;
}
if (opacity != 1.0f) {
ctx->PushGroup(gfxASurface::CONTENT_COLOR_ALPHA);
}
nscoord appUnitsPerDevPx = PresContext()->AppUnitsPerDevPixel();
nsRect dirtyRect; // only used if aDirtyRect is non-null
if (aDirtyRect) {
NS_ASSERTION(!NS_SVGDisplayListPaintingEnabled() ||
(mState & NS_STATE_SVG_NONDISPLAY_CHILD),
"Display lists handle dirty rect intersection test");
dirtyRect = aDirtyRect->ToAppUnits(appUnitsPerDevPx);
// Adjust dirtyRect to match our local coordinate system.
nsRect rootRect =
nsSVGUtils::TransformFrameRectToOuterSVG(mRect,
GetCanvasTM(FOR_PAINTING), PresContext());
dirtyRect.MoveBy(-rootRect.TopLeft());
}
// XXXbholley - I don't think huge images in SVGs are common enough to
// warrant worrying about the responsiveness impact of doing synchronous
// decodes. The extra code complexity of determinining when we want to
// force sync probably just isn't worth it, so always pass FLAG_SYNC_DECODE
uint32_t drawFlags = imgIContainer::FLAG_SYNC_DECODE;
if (mImageContainer->GetType() == imgIContainer::TYPE_VECTOR) {
// Package up the attributes of this image element which can override the
// attributes of mImageContainer's internal SVG document.
SVGImageContext context(imgElem->mPreserveAspectRatio.GetAnimValue());
nsRect destRect(0, 0,
appUnitsPerDevPx * width,
appUnitsPerDevPx * height);
// Note: Can't use DrawSingleUnscaledImage for the TYPE_VECTOR case.
// That method needs our image to have a fixed native width & height,
// and that's not always true for TYPE_VECTOR images.
nsLayoutUtils::DrawSingleImage(
aContext,
mImageContainer,
nsLayoutUtils::GetGraphicsFilterForFrame(this),
destRect,
aDirtyRect ? dirtyRect : destRect,
&context,
drawFlags);
} else { // mImageContainer->GetType() == TYPE_RASTER
nsLayoutUtils::DrawSingleUnscaledImage(
aContext,
mImageContainer,
nsLayoutUtils::GetGraphicsFilterForFrame(this),
nsPoint(0, 0),
aDirtyRect ? &dirtyRect : nullptr,
drawFlags);
}
if (opacity != 1.0f) {
ctx->PopGroupToSource();
ctx->SetOperator(gfxContext::OPERATOR_OVER);
ctx->Paint(opacity);
}
// gfxContextAutoSaveRestore goes out of scope & cleans up our gfxContext
}
return rv;
}
NS_IMETHODIMP_(nsIFrame*)
nsSVGImageFrame::GetFrameForPoint(const nsPoint &aPoint)
{
// Special case for raster images -- we only want to accept points that fall
// in the underlying image's (transformed) native bounds. That region
// doesn't necessarily map to our <image> element's [x,y,width,height]. So,
// we have to look up the native image size & our image transform in order
// to filter out points that fall outside that area.
if (StyleDisplay()->IsScrollableOverflow() && mImageContainer) {
if (mImageContainer->GetType() == imgIContainer::TYPE_RASTER) {
int32_t nativeWidth, nativeHeight;
if (NS_FAILED(mImageContainer->GetWidth(&nativeWidth)) ||
NS_FAILED(mImageContainer->GetHeight(&nativeHeight)) ||
nativeWidth == 0 || nativeHeight == 0) {
return nullptr;
}
if (!nsSVGUtils::HitTestRect(
GetRasterImageTransform(nativeWidth, nativeHeight,
FOR_HIT_TESTING),
0, 0, nativeWidth, nativeHeight,
PresContext()->AppUnitsToDevPixels(aPoint.x),
PresContext()->AppUnitsToDevPixels(aPoint.y))) {
return nullptr;
}
}
// The special case above doesn't apply to vector images, because they
// don't limit their drawing to explicit "native bounds" -- they have
// an infinite canvas on which to place content. So it's reasonable to
// just fall back on our <image> element's own bounds here.
}
return nsSVGImageFrameBase::GetFrameForPoint(aPoint);
}
nsIAtom *
nsSVGImageFrame::GetType() const
{
return nsGkAtoms::svgImageFrame;
}
//----------------------------------------------------------------------
// nsSVGPathGeometryFrame methods:
// Lie about our fill/stroke so that covered region and hit detection work properly
void
nsSVGImageFrame::ReflowSVG()
{
NS_ASSERTION(nsSVGUtils::OuterSVGIsCallingReflowSVG(this),
"This call is probably a wasteful mistake");
NS_ABORT_IF_FALSE(!(GetStateBits() & NS_STATE_SVG_NONDISPLAY_CHILD),
"ReflowSVG mechanism not designed for this");
if (!nsSVGUtils::NeedsReflowSVG(this)) {
return;
}
gfxContext tmpCtx(gfxPlatform::GetPlatform()->ScreenReferenceSurface());
// We'd like to just pass the identity matrix to GeneratePath, but if
// this frame's user space size is _very_ large/small then the extents we
// obtain below might have overflowed or otherwise be broken. This would
// cause us to end up with a broken mRect and visual overflow rect and break
// painting of this frame. This is particularly noticeable if the transforms
// between us and our nsSVGOuterSVGFrame scale this frame to a reasonable
// size. To avoid this we sadly have to do extra work to account for the
// transforms between us and our nsSVGOuterSVGFrame, even though the
// overwhelming number of SVGs will never have this problem.
// XXX Will Azure eventually save us from having to do this?
gfxSize scaleFactors = GetCanvasTM(FOR_OUTERSVG_TM).ScaleFactors(true);
bool applyScaling = fabs(scaleFactors.width) >= 1e-6 &&
fabs(scaleFactors.height) >= 1e-6;
gfxMatrix scaling;
if (applyScaling) {
scaling.Scale(scaleFactors.width, scaleFactors.height);
}
tmpCtx.Save();
GeneratePath(&tmpCtx, scaling);
tmpCtx.Restore();
gfxRect extent = tmpCtx.GetUserPathExtent();
if (applyScaling) {
extent.Scale(1 / scaleFactors.width, 1 / scaleFactors.height);
}
if (!extent.IsEmpty()) {
mRect = nsLayoutUtils::RoundGfxRectToAppRect(extent,
PresContext()->AppUnitsPerCSSPixel());
} else {
mRect.SetEmpty();
}
if (mState & NS_FRAME_FIRST_REFLOW) {
// Make sure we have our filter property (if any) before calling
// FinishAndStoreOverflow (subsequent filter changes are handled off
// nsChangeHint_UpdateEffects):
nsSVGEffects::UpdateEffects(this);
}
nsRect overflow = nsRect(nsPoint(0,0), mRect.Size());
nsOverflowAreas overflowAreas(overflow, overflow);
FinishAndStoreOverflow(overflowAreas, mRect.Size());
mState &= ~(NS_FRAME_FIRST_REFLOW | NS_FRAME_IS_DIRTY |
NS_FRAME_HAS_DIRTY_CHILDREN);
// Invalidate, but only if this is not our first reflow (since if it is our
// first reflow then we haven't had our first paint yet).
if (!(GetParent()->GetStateBits() & NS_FRAME_FIRST_REFLOW)) {
InvalidateFrame();
}
}
uint16_t
nsSVGImageFrame::GetHitTestFlags()
{
uint16_t flags = 0;
switch(StyleVisibility()->mPointerEvents) {
case NS_STYLE_POINTER_EVENTS_NONE:
break;
case NS_STYLE_POINTER_EVENTS_VISIBLEPAINTED:
case NS_STYLE_POINTER_EVENTS_AUTO:
if (StyleVisibility()->IsVisible()) {
/* XXX: should check pixel transparency */
flags |= SVG_HIT_TEST_FILL;
}
break;
case NS_STYLE_POINTER_EVENTS_VISIBLEFILL:
case NS_STYLE_POINTER_EVENTS_VISIBLESTROKE:
case NS_STYLE_POINTER_EVENTS_VISIBLE:
if (StyleVisibility()->IsVisible()) {
flags |= SVG_HIT_TEST_FILL;
}
break;
case NS_STYLE_POINTER_EVENTS_PAINTED:
/* XXX: should check pixel transparency */
flags |= SVG_HIT_TEST_FILL;
break;
case NS_STYLE_POINTER_EVENTS_FILL:
case NS_STYLE_POINTER_EVENTS_STROKE:
case NS_STYLE_POINTER_EVENTS_ALL:
flags |= SVG_HIT_TEST_FILL;
break;
default:
NS_ERROR("not reached");
break;
}
return flags;
}
//----------------------------------------------------------------------
// nsSVGImageListener implementation
NS_IMPL_ISUPPORTS1(nsSVGImageListener, imgINotificationObserver)
nsSVGImageListener::nsSVGImageListener(nsSVGImageFrame *aFrame) : mFrame(aFrame)
{
}
NS_IMETHODIMP
nsSVGImageListener::Notify(imgIRequest *aRequest, int32_t aType, const nsIntRect* aData)
{
if (!mFrame)
return NS_ERROR_FAILURE;
if (aType == imgINotificationObserver::LOAD_COMPLETE) {
nsSVGUtils::InvalidateBounds(mFrame, false);
nsSVGUtils::ScheduleReflowSVG(mFrame);
}
if (aType == imgINotificationObserver::FRAME_UPDATE) {
// No new dimensions, so we don't need to call
// nsSVGUtils::InvalidateAndScheduleBoundsUpdate.
nsSVGEffects::InvalidateRenderingObservers(mFrame);
nsSVGUtils::InvalidateBounds(mFrame);
}
if (aType == imgINotificationObserver::SIZE_AVAILABLE) {
// Called once the resource's dimensions have been obtained.
aRequest->GetImage(getter_AddRefs(mFrame->mImageContainer));
nsSVGUtils::InvalidateBounds(mFrame, false);
nsSVGUtils::ScheduleReflowSVG(mFrame);
}
return NS_OK;
}
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