gecko/layout/svg/nsSVGFilterFrame.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2012-05-21 04:12:37 -07:00
/* 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/. */
// Main header first:
#include "nsSVGFilterFrame.h"
// Keep others in (case-insensitive) order:
#include "gfxASurface.h"
#include "gfxUtils.h"
#include "nsGkAtoms.h"
#include "nsRenderingContext.h"
#include "nsSVGEffects.h"
#include "nsSVGElement.h"
#include "mozilla/dom/SVGFilterElement.h"
#include "nsSVGFilterInstance.h"
#include "nsSVGFilterPaintCallback.h"
#include "nsSVGIntegrationUtils.h"
#include "nsSVGUtils.h"
#include "nsContentUtils.h"
using namespace mozilla::dom;
nsIFrame*
NS_NewSVGFilterFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) nsSVGFilterFrame(aContext);
}
NS_IMPL_FRAMEARENA_HELPERS(nsSVGFilterFrame)
/**
* Converts an nsRect that is relative to a filtered frame's origin (i.e. the
* top-left corner of its border box) into filter space.
* Returns the entire filter region (a rect the width/height of aFilterRes) if
* aFrameRect is null, or if the result is too large to be stored in an
* nsIntRect.
*/
static nsIntRect
MapFrameRectToFilterSpace(const nsRect* aRect,
int32_t aAppUnitsPerCSSPx,
const gfxMatrix& aFrameSpaceInCSSPxToFilterSpace,
const gfxIntSize& aFilterRes)
{
nsIntRect rect(0, 0, aFilterRes.width, aFilterRes.height);
if (aRect) {
if (aRect->IsEmpty()) {
return nsIntRect();
}
gfxRect rectInCSSPx =
nsLayoutUtils::RectToGfxRect(*aRect, aAppUnitsPerCSSPx);
gfxRect rectInFilterSpace =
aFrameSpaceInCSSPxToFilterSpace.TransformBounds(rectInCSSPx);
rectInFilterSpace.RoundOut();
nsIntRect intRect;
if (gfxUtils::GfxRectToIntRect(rectInFilterSpace, &intRect)) {
rect = intRect;
}
}
return rect;
}
/**
* Returns the transform from frame space to the coordinate space that
* GetCanvasTM transforms to. "Frame space" is the origin of a frame, aka the
* top-left corner of its border box, aka the top left corner of its mRect.
*/
static gfxMatrix
GetUserToFrameSpaceInCSSPxTransform(nsIFrame *aFrame)
{
gfxMatrix userToFrameSpaceInCSSPx;
if ((aFrame->GetStateBits() & NS_FRAME_SVG_LAYOUT)) {
int32_t appUnitsPerCSSPx = aFrame->PresContext()->AppUnitsPerCSSPixel();
// As currently implemented by Mozilla for the purposes of filters, user
// space is the coordinate system established by GetCanvasTM(), since
// that's what we use to set filterToDeviceSpace above. In other words,
// for SVG, user space is actually the coordinate system aTarget
// establishes for _its_ children (i.e. after taking account of any x/y
// and viewBox attributes), not the coordinate system that is established
// for it by its 'transform' attribute (or by its _parent_) as it's
// normally defined. (XXX We should think about fixing this.) The only
// frame type for which these extra transforms are not simply an x/y
// translation is nsSVGInnerSVGFrame, hence we treat it specially here.
if (aFrame->GetType() == nsGkAtoms::svgInnerSVGFrame) {
userToFrameSpaceInCSSPx =
static_cast<nsSVGElement*>(aFrame->GetContent())->
PrependLocalTransformsTo(gfxMatrix());
} else {
gfxPoint targetsUserSpaceOffset =
nsLayoutUtils::RectToGfxRect(aFrame->GetRect(), appUnitsPerCSSPx).
TopLeft();
userToFrameSpaceInCSSPx.Translate(-targetsUserSpaceOffset);
}
}
// else, for all other frames, leave as the identity matrix
return userToFrameSpaceInCSSPx;
}
class nsSVGFilterFrame::AutoFilterReferencer
{
public:
AutoFilterReferencer(nsSVGFilterFrame *aFrame)
: mFrame(aFrame)
{
// Reference loops should normally be detected in advance and handled, so
// we're not expecting to encounter them here
NS_ABORT_IF_FALSE(!mFrame->mLoopFlag, "Undetected reference loop!");
mFrame->mLoopFlag = true;
}
~AutoFilterReferencer() {
mFrame->mLoopFlag = false;
}
private:
nsSVGFilterFrame *mFrame;
};
class MOZ_STACK_CLASS nsAutoFilterInstance {
public:
nsAutoFilterInstance(nsIFrame *aTarget,
nsSVGFilterFrame *aFilterFrame,
nsSVGFilterPaintCallback *aPaint,
const nsRect *aPostFilterDirtyRect,
const nsRect *aPreFilterDirtyRect,
const nsRect *aOverridePreFilterVisualOverflowRect,
const gfxRect *aOverrideBBox = nullptr,
nsIFrame* aTransformRoot = nullptr);
~nsAutoFilterInstance() {}
// If this returns null, then draw nothing. Either the filter draws
// nothing or it is "in error".
nsSVGFilterInstance* get() { return mInstance; }
private:
nsAutoPtr<nsSVGFilterInstance> mInstance;
};
nsAutoFilterInstance::nsAutoFilterInstance(nsIFrame *aTarget,
nsSVGFilterFrame *aFilterFrame,
nsSVGFilterPaintCallback *aPaint,
const nsRect *aPostFilterDirtyRect,
const nsRect *aPreFilterDirtyRect,
const nsRect *aPreFilterVisualOverflowRectOverride,
const gfxRect *aOverrideBBox,
nsIFrame* aTransformRoot)
{
const SVGFilterElement *filter = aFilterFrame->GetFilterContent();
uint16_t filterUnits =
aFilterFrame->GetEnumValue(SVGFilterElement::FILTERUNITS);
uint16_t primitiveUnits =
aFilterFrame->GetEnumValue(SVGFilterElement::PRIMITIVEUNITS);
gfxRect bbox = aOverrideBBox ? *aOverrideBBox : nsSVGUtils::GetBBox(aTarget);
// Get the filter region (in the filtered element's user space):
// XXX if filterUnits is set (or has defaulted) to objectBoundingBox, we
// should send a warning to the error console if the author has used lengths
// with units. This is a common mistake and can result in filterRes being
// *massive* below (because we ignore the units and interpret the number as
// a factor of the bbox width/height). We should also send a warning if the
// user uses a number without units (a future SVG spec should really
// deprecate that, since it's too confusing for a bare number to be sometimes
// interpreted as a fraction of the bounding box and sometimes as user-space
// units). So really only percentage values should be used in this case.
nsSVGLength2 XYWH[4];
NS_ABORT_IF_FALSE(sizeof(filter->mLengthAttributes) == sizeof(XYWH),
"XYWH size incorrect");
memcpy(XYWH, filter->mLengthAttributes, sizeof(filter->mLengthAttributes));
XYWH[0] = *aFilterFrame->GetLengthValue(SVGFilterElement::ATTR_X);
XYWH[1] = *aFilterFrame->GetLengthValue(SVGFilterElement::ATTR_Y);
XYWH[2] = *aFilterFrame->GetLengthValue(SVGFilterElement::ATTR_WIDTH);
XYWH[3] = *aFilterFrame->GetLengthValue(SVGFilterElement::ATTR_HEIGHT);
// The filter region in user space, in user units:
gfxRect filterRegion = nsSVGUtils::GetRelativeRect(filterUnits,
XYWH, bbox, aTarget);
if (filterRegion.Width() <= 0 || filterRegion.Height() <= 0) {
// 0 disables rendering, < 0 is error. dispatch error console warning
// or error as appropriate.
return;
}
// Calculate filterRes (the width and height of the pixel buffer of the
// temporary offscreen surface that we would/will create to paint into when
// painting the entire filtered element) and, if necessary, adjust
// filterRegion out slightly so that it aligns with pixel boundaries of this
// buffer:
gfxIntSize filterRes;
const nsSVGIntegerPair* filterResAttrs =
aFilterFrame->GetIntegerPairValue(SVGFilterElement::FILTERRES);
if (filterResAttrs->IsExplicitlySet()) {
int32_t filterResX = filterResAttrs->GetAnimValue(nsSVGIntegerPair::eFirst);
int32_t filterResY = filterResAttrs->GetAnimValue(nsSVGIntegerPair::eSecond);
if (filterResX <= 0 || filterResY <= 0) {
// 0 disables rendering, < 0 is error. dispatch error console warning?
return;
}
filterRegion.Scale(filterResX, filterResY);
filterRegion.RoundOut();
filterRegion.Scale(1.0 / filterResX, 1.0 / filterResY);
// We don't care if this overflows, because we can handle upscaling/
// downscaling to filterRes
bool overflow;
filterRes =
nsSVGUtils::ConvertToSurfaceSize(gfxSize(filterResX, filterResY),
&overflow);
// XXX we could send a warning to the error console if the author specified
// filterRes doesn't align well with our outer 'svg' device space.
} else {
// Match filterRes as closely as possible to the pixel density of the nearest
// outer 'svg' device space:
gfxMatrix canvasTM =
nsSVGUtils::GetCanvasTM(aTarget, nsISVGChildFrame::FOR_OUTERSVG_TM);
if (canvasTM.IsSingular()) {
// nothing to draw
return;
}
float scale = nsSVGUtils::MaxExpansion(canvasTM);
filterRegion.Scale(scale);
filterRegion.RoundOut();
// We don't care if this overflows, because we can handle upscaling/
// downscaling to filterRes
bool overflow;
filterRes = nsSVGUtils::ConvertToSurfaceSize(filterRegion.Size(),
&overflow);
filterRegion.Scale(1.0 / scale);
}
// Get various transforms:
gfxMatrix filterToUserSpace(filterRegion.Width() / filterRes.width, 0.0f,
0.0f, filterRegion.Height() / filterRes.height,
filterRegion.X(), filterRegion.Y());
// Only used (so only set) when we paint:
gfxMatrix filterToDeviceSpace;
if (aPaint) {
filterToDeviceSpace = filterToUserSpace *
nsSVGUtils::GetCanvasTM(aTarget, nsISVGChildFrame::FOR_PAINTING);
}
// Convert the passed in rects from frame to filter space:
int32_t appUnitsPerCSSPx = aTarget->PresContext()->AppUnitsPerCSSPixel();
gfxMatrix filterToFrameSpaceInCSSPx =
filterToUserSpace * GetUserToFrameSpaceInCSSPxTransform(aTarget);
// filterToFrameSpaceInCSSPx is always invertible
gfxMatrix frameSpaceInCSSPxTofilterSpace = filterToFrameSpaceInCSSPx;
frameSpaceInCSSPxTofilterSpace.Invert();
nsIntRect postFilterDirtyRect =
MapFrameRectToFilterSpace(aPostFilterDirtyRect, appUnitsPerCSSPx,
frameSpaceInCSSPxTofilterSpace, filterRes);
nsIntRect preFilterDirtyRect =
MapFrameRectToFilterSpace(aPreFilterDirtyRect, appUnitsPerCSSPx,
frameSpaceInCSSPxTofilterSpace, filterRes);
nsIntRect preFilterVisualOverflowRect;
if (aPreFilterVisualOverflowRectOverride) {
preFilterVisualOverflowRect =
MapFrameRectToFilterSpace(aPreFilterVisualOverflowRectOverride,
appUnitsPerCSSPx,
frameSpaceInCSSPxTofilterSpace, filterRes);
} else {
nsRect preFilterVOR = aTarget->GetPreEffectsVisualOverflowRect();
preFilterVisualOverflowRect =
MapFrameRectToFilterSpace(&preFilterVOR, appUnitsPerCSSPx,
frameSpaceInCSSPxTofilterSpace, filterRes);
}
// Setup instance data
mInstance =
new nsSVGFilterInstance(aTarget, aPaint, filter, bbox, filterRegion,
nsIntSize(filterRes.width, filterRes.height),
filterToDeviceSpace, filterToFrameSpaceInCSSPx,
preFilterVisualOverflowRect, postFilterDirtyRect,
preFilterDirtyRect, primitiveUnits,
aTransformRoot);
}
uint16_t
nsSVGFilterFrame::GetEnumValue(uint32_t aIndex, nsIContent *aDefault)
{
nsSVGEnum& thisEnum =
static_cast<SVGFilterElement *>(mContent)->mEnumAttributes[aIndex];
if (thisEnum.IsExplicitlySet())
return thisEnum.GetAnimValue();
AutoFilterReferencer filterRef(this);
nsSVGFilterFrame *next = GetReferencedFilterIfNotInUse();
return next ? next->GetEnumValue(aIndex, aDefault) :
static_cast<SVGFilterElement *>(aDefault)->
mEnumAttributes[aIndex].GetAnimValue();
}
const nsSVGIntegerPair *
nsSVGFilterFrame::GetIntegerPairValue(uint32_t aIndex, nsIContent *aDefault)
{
const nsSVGIntegerPair *thisIntegerPair =
&static_cast<SVGFilterElement *>(mContent)->mIntegerPairAttributes[aIndex];
if (thisIntegerPair->IsExplicitlySet())
return thisIntegerPair;
AutoFilterReferencer filterRef(this);
nsSVGFilterFrame *next = GetReferencedFilterIfNotInUse();
return next ? next->GetIntegerPairValue(aIndex, aDefault) :
&static_cast<SVGFilterElement *>(aDefault)->mIntegerPairAttributes[aIndex];
}
const nsSVGLength2 *
nsSVGFilterFrame::GetLengthValue(uint32_t aIndex, nsIContent *aDefault)
{
const nsSVGLength2 *thisLength =
&static_cast<SVGFilterElement *>(mContent)->mLengthAttributes[aIndex];
if (thisLength->IsExplicitlySet())
return thisLength;
AutoFilterReferencer filterRef(this);
nsSVGFilterFrame *next = GetReferencedFilterIfNotInUse();
return next ? next->GetLengthValue(aIndex, aDefault) :
&static_cast<SVGFilterElement *>(aDefault)->mLengthAttributes[aIndex];
}
const SVGFilterElement *
nsSVGFilterFrame::GetFilterContent(nsIContent *aDefault)
{
for (nsIContent* child = mContent->GetFirstChild();
child;
child = child->GetNextSibling()) {
nsRefPtr<nsSVGFE> primitive;
CallQueryInterface(child, (nsSVGFE**)getter_AddRefs(primitive));
if (primitive) {
return static_cast<SVGFilterElement *>(mContent);
}
}
AutoFilterReferencer filterRef(this);
nsSVGFilterFrame *next = GetReferencedFilterIfNotInUse();
return next ? next->GetFilterContent(aDefault) :
static_cast<SVGFilterElement *>(aDefault);
}
nsSVGFilterFrame *
nsSVGFilterFrame::GetReferencedFilter()
{
if (mNoHRefURI)
return nullptr;
nsSVGPaintingProperty *property = static_cast<nsSVGPaintingProperty*>
(Properties().Get(nsSVGEffects::HrefProperty()));
if (!property) {
// Fetch our Filter element's xlink:href attribute
SVGFilterElement *filter = static_cast<SVGFilterElement *>(mContent);
nsAutoString href;
filter->mStringAttributes[SVGFilterElement::HREF].GetAnimValue(href, filter);
if (href.IsEmpty()) {
mNoHRefURI = true;
return nullptr; // no URL
}
// Convert href to an nsIURI
nsCOMPtr<nsIURI> targetURI;
nsCOMPtr<nsIURI> base = mContent->GetBaseURI();
nsContentUtils::NewURIWithDocumentCharset(getter_AddRefs(targetURI), href,
mContent->GetCurrentDoc(), base);
property =
nsSVGEffects::GetPaintingProperty(targetURI, this, nsSVGEffects::HrefProperty());
if (!property)
return nullptr;
}
nsIFrame *result = property->GetReferencedFrame();
if (!result)
return nullptr;
nsIAtom* frameType = result->GetType();
if (frameType != nsGkAtoms::svgFilterFrame)
return nullptr;
return static_cast<nsSVGFilterFrame*>(result);
}
nsSVGFilterFrame *
nsSVGFilterFrame::GetReferencedFilterIfNotInUse()
{
nsSVGFilterFrame *referenced = GetReferencedFilter();
if (!referenced)
return nullptr;
if (referenced->mLoopFlag) {
// XXXjwatt: we should really send an error to the JavaScript Console here:
NS_WARNING("Filter reference loop detected while inheriting attribute!");
return nullptr;
}
return referenced;
}
NS_IMETHODIMP
nsSVGFilterFrame::AttributeChanged(int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType)
{
if (aNameSpaceID == kNameSpaceID_None &&
(aAttribute == nsGkAtoms::x ||
aAttribute == nsGkAtoms::y ||
aAttribute == nsGkAtoms::width ||
aAttribute == nsGkAtoms::height ||
aAttribute == nsGkAtoms::filterRes ||
aAttribute == nsGkAtoms::filterUnits ||
aAttribute == nsGkAtoms::primitiveUnits)) {
nsSVGEffects::InvalidateDirectRenderingObservers(this);
} else if (aNameSpaceID == kNameSpaceID_XLink &&
aAttribute == nsGkAtoms::href) {
// Blow away our reference, if any
Properties().Delete(nsSVGEffects::HrefProperty());
mNoHRefURI = false;
// And update whoever references us
nsSVGEffects::InvalidateDirectRenderingObservers(this);
}
return nsSVGFilterFrameBase::AttributeChanged(aNameSpaceID,
aAttribute, aModType);
}
nsresult
nsSVGFilterFrame::PaintFilteredFrame(nsRenderingContext *aContext,
nsIFrame *aFilteredFrame,
nsSVGFilterPaintCallback *aPaintCallback,
const nsRect *aDirtyArea,
nsIFrame* aTransformRoot)
{
nsAutoFilterInstance instance(aFilteredFrame, this, aPaintCallback,
aDirtyArea, nullptr, nullptr, nullptr,
aTransformRoot);
if (!instance.get()) {
return NS_OK;
}
nsRefPtr<gfxASurface> result;
nsresult rv = instance.get()->Render(getter_AddRefs(result));
if (NS_SUCCEEDED(rv) && result) {
nsSVGUtils::CompositeSurfaceMatrix(aContext->ThebesContext(),
result, instance.get()->GetFilterSpaceToDeviceSpaceTransform(), 1.0);
}
return rv;
}
static nsRect
TransformFilterSpaceToFrameSpace(nsSVGFilterInstance *aInstance,
nsIntRect *aRect)
{
if (aRect->IsEmpty()) {
return nsRect();
}
gfxMatrix m = aInstance->GetFilterSpaceToFrameSpaceInCSSPxTransform();
gfxRect r(aRect->x, aRect->y, aRect->width, aRect->height);
r = m.TransformBounds(r);
return nsLayoutUtils::RoundGfxRectToAppRect(r, aInstance->AppUnitsPerCSSPixel());
}
nsRect
nsSVGFilterFrame::GetPostFilterDirtyArea(nsIFrame *aFilteredFrame,
const nsRect& aPreFilterDirtyRect)
{
if (aPreFilterDirtyRect.IsEmpty()) {
return nsRect();
}
nsAutoFilterInstance instance(aFilteredFrame, this, nullptr, nullptr,
&aPreFilterDirtyRect, nullptr);
if (!instance.get()) {
return nsRect();
}
// We've passed in the source's dirty area so the instance knows about it.
// Now we can ask the instance to compute the area of the filter output
// that's dirty.
nsIntRect dirtyRect;
nsresult rv = instance.get()->ComputePostFilterDirtyRect(&dirtyRect);
if (NS_SUCCEEDED(rv)) {
return TransformFilterSpaceToFrameSpace(instance.get(), &dirtyRect);
}
return nsRect();
}
nsRect
nsSVGFilterFrame::GetPreFilterNeededArea(nsIFrame *aFilteredFrame,
const nsRect& aPostFilterDirtyRect)
{
nsAutoFilterInstance instance(aFilteredFrame, this, nullptr,
&aPostFilterDirtyRect, nullptr, nullptr);
if (!instance.get()) {
return nsRect();
}
// Now we can ask the instance to compute the area of the source
// that's needed.
nsIntRect neededRect;
nsresult rv = instance.get()->ComputeSourceNeededRect(&neededRect);
if (NS_SUCCEEDED(rv)) {
return TransformFilterSpaceToFrameSpace(instance.get(), &neededRect);
}
return nsRect();
}
nsRect
nsSVGFilterFrame::GetPostFilterBounds(nsIFrame *aFilteredFrame,
const gfxRect *aOverrideBBox,
const nsRect *aPreFilterBounds)
{
MOZ_ASSERT(!(aFilteredFrame->GetStateBits() & NS_FRAME_SVG_LAYOUT) ||
!(aFilteredFrame->GetStateBits() & NS_FRAME_IS_NONDISPLAY),
"Non-display SVG do not maintain visual overflow rects");
nsAutoFilterInstance instance(aFilteredFrame, this, nullptr, nullptr,
aPreFilterBounds, aPreFilterBounds,
aOverrideBBox);
if (!instance.get()) {
return nsRect();
}
// We've passed in the source's bounding box so the instance knows about
// it. Now we can ask the instance to compute the bounding box of
// the filter output.
nsIntRect bbox;
nsresult rv = instance.get()->ComputeOutputBBox(&bbox);
if (NS_SUCCEEDED(rv)) {
return TransformFilterSpaceToFrameSpace(instance.get(), &bbox);
}
return nsRect();
}
#ifdef DEBUG
void
nsSVGFilterFrame::Init(nsIContent* aContent,
nsIFrame* aParent,
nsIFrame* aPrevInFlow)
{
NS_ASSERTION(aContent->IsSVG(nsGkAtoms::filter),
"Content is not an SVG filter");
nsSVGFilterFrameBase::Init(aContent, aParent, aPrevInFlow);
}
#endif /* DEBUG */
nsIAtom *
nsSVGFilterFrame::GetType() const
{
return nsGkAtoms::svgFilterFrame;
}