зеркало из https://github.com/mozilla/gecko-dev.git
441 строка
16 KiB
C++
441 строка
16 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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// Main header first:
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#include "nsSVGFilterInstance.h"
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// Keep others in (case-insensitive) order:
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#include "gfxPlatform.h"
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#include "gfxUtils.h"
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#include "nsSVGDisplayableFrame.h"
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#include "mozilla/dom/HTMLCanvasElement.h"
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#include "mozilla/dom/SVGFilterElement.h"
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#include "nsReferencedElement.h"
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#include "nsSVGEffects.h"
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#include "nsSVGFilterFrame.h"
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#include "nsSVGUtils.h"
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#include "SVGContentUtils.h"
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#include "FilterSupport.h"
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#include "gfx2DGlue.h"
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using namespace mozilla;
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using namespace mozilla::dom;
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using namespace mozilla::gfx;
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nsSVGFilterInstance::nsSVGFilterInstance(const nsStyleFilter& aFilter,
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nsIFrame* aTargetFrame,
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nsIContent* aTargetContent,
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const UserSpaceMetrics& aMetrics,
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const gfxRect& aTargetBBox,
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const gfxSize& aUserSpaceToFilterSpaceScale) :
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mFilter(aFilter),
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mTargetContent(aTargetContent),
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mMetrics(aMetrics),
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mTargetBBox(aTargetBBox),
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mUserSpaceToFilterSpaceScale(aUserSpaceToFilterSpaceScale),
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mSourceAlphaAvailable(false),
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mInitialized(false) {
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// Get the filter frame.
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mFilterFrame = GetFilterFrame(aTargetFrame);
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if (!mFilterFrame) {
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return;
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}
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// Get the filter element.
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mFilterElement = mFilterFrame->GetFilterContent();
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if (!mFilterElement) {
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NS_NOTREACHED("filter frame should have a related element");
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return;
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}
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mPrimitiveUnits =
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mFilterFrame->GetEnumValue(SVGFilterElement::PRIMITIVEUNITS);
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if (!ComputeBounds()) {
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return;
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}
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mInitialized = true;
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}
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bool
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nsSVGFilterInstance::ComputeBounds()
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{
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// XXX if filterUnits is set (or has defaulted) to objectBoundingBox, we
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// should send a warning to the error console if the author has used lengths
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// with units. This is a common mistake and can result in the filter region
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// being *massive* below (because we ignore the units and interpret the number
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// as a factor of the bbox width/height). We should also send a warning if the
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// user uses a number without units (a future SVG spec should really
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// deprecate that, since it's too confusing for a bare number to be sometimes
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// interpreted as a fraction of the bounding box and sometimes as user-space
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// units). So really only percentage values should be used in this case.
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// Set the user space bounds (i.e. the filter region in user space).
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nsSVGLength2 XYWH[4];
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static_assert(sizeof(mFilterElement->mLengthAttributes) == sizeof(XYWH),
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"XYWH size incorrect");
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memcpy(XYWH, mFilterElement->mLengthAttributes,
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sizeof(mFilterElement->mLengthAttributes));
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XYWH[0] = *mFilterFrame->GetLengthValue(SVGFilterElement::ATTR_X);
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XYWH[1] = *mFilterFrame->GetLengthValue(SVGFilterElement::ATTR_Y);
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XYWH[2] = *mFilterFrame->GetLengthValue(SVGFilterElement::ATTR_WIDTH);
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XYWH[3] = *mFilterFrame->GetLengthValue(SVGFilterElement::ATTR_HEIGHT);
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uint16_t filterUnits =
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mFilterFrame->GetEnumValue(SVGFilterElement::FILTERUNITS);
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gfxRect userSpaceBounds =
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nsSVGUtils::GetRelativeRect(filterUnits, XYWH, mTargetBBox, mMetrics);
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// Transform the user space bounds to filter space, so we
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// can align them with the pixel boundries of the offscreen surface.
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// The offscreen surface has the same scale as filter space.
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gfxRect filterSpaceBounds = UserSpaceToFilterSpace(userSpaceBounds);
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filterSpaceBounds.RoundOut();
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if (filterSpaceBounds.width <= 0 || filterSpaceBounds.height <= 0) {
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// 0 disables rendering, < 0 is error. dispatch error console warning
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// or error as appropriate.
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return false;
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}
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// Set the filter space bounds.
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if (!gfxUtils::GfxRectToIntRect(filterSpaceBounds, &mFilterSpaceBounds)) {
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// The filter region is way too big if there is float -> int overflow.
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return false;
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}
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return true;
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}
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nsSVGFilterFrame*
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nsSVGFilterInstance::GetFilterFrame(nsIFrame* aTargetFrame)
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{
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if (mFilter.GetType() != NS_STYLE_FILTER_URL) {
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// The filter is not an SVG reference filter.
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return nullptr;
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}
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// Get the target element to use as a point of reference for looking up the
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// filter element.
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if (!mTargetContent) {
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return nullptr;
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}
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// aTargetFrame can be null if this filter belongs to a
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// CanvasRenderingContext2D.
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nsCOMPtr<nsIURI> url = aTargetFrame
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? nsSVGEffects::GetFilterURI(aTargetFrame, mFilter)
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: mFilter.GetURL()->ResolveLocalRef(mTargetContent);
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if (!url) {
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NS_NOTREACHED("an nsStyleFilter of type URL should have a non-null URL");
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return nullptr;
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}
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// Look up the filter element by URL.
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nsReferencedElement filterElement;
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bool watch = false;
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filterElement.Reset(mTargetContent, url, watch);
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Element* element = filterElement.get();
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if (!element) {
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// The URL points to no element.
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return nullptr;
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}
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// Get the frame of the filter element.
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nsIFrame* frame = element->GetPrimaryFrame();
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if (!frame || !frame->IsSVGFilterFrame()) {
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// The URL points to an element that's not an SVG filter element, or to an
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// element that hasn't had its frame constructed yet.
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return nullptr;
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}
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return static_cast<nsSVGFilterFrame*>(frame);
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}
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float
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nsSVGFilterInstance::GetPrimitiveNumber(uint8_t aCtxType, float aValue) const
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{
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nsSVGLength2 val;
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val.Init(aCtxType, 0xff, aValue,
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nsIDOMSVGLength::SVG_LENGTHTYPE_NUMBER);
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float value;
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if (mPrimitiveUnits == SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
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value = nsSVGUtils::ObjectSpace(mTargetBBox, &val);
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} else {
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value = nsSVGUtils::UserSpace(mMetrics, &val);
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}
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switch (aCtxType) {
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case SVGContentUtils::X:
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return value * mUserSpaceToFilterSpaceScale.width;
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case SVGContentUtils::Y:
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return value * mUserSpaceToFilterSpaceScale.height;
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case SVGContentUtils::XY:
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default:
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return value * SVGContentUtils::ComputeNormalizedHypotenuse(
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mUserSpaceToFilterSpaceScale.width,
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mUserSpaceToFilterSpaceScale.height);
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}
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}
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Point3D
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nsSVGFilterInstance::ConvertLocation(const Point3D& aPoint) const
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{
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nsSVGLength2 val[4];
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val[0].Init(SVGContentUtils::X, 0xff, aPoint.x,
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nsIDOMSVGLength::SVG_LENGTHTYPE_NUMBER);
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val[1].Init(SVGContentUtils::Y, 0xff, aPoint.y,
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nsIDOMSVGLength::SVG_LENGTHTYPE_NUMBER);
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// Dummy width/height values
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val[2].Init(SVGContentUtils::X, 0xff, 0,
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nsIDOMSVGLength::SVG_LENGTHTYPE_NUMBER);
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val[3].Init(SVGContentUtils::Y, 0xff, 0,
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nsIDOMSVGLength::SVG_LENGTHTYPE_NUMBER);
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gfxRect feArea = nsSVGUtils::GetRelativeRect(mPrimitiveUnits,
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val, mTargetBBox, mMetrics);
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gfxRect r = UserSpaceToFilterSpace(feArea);
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return Point3D(r.x, r.y, GetPrimitiveNumber(SVGContentUtils::XY, aPoint.z));
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}
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gfxRect
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nsSVGFilterInstance::UserSpaceToFilterSpace(const gfxRect& aUserSpaceRect) const
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{
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gfxRect filterSpaceRect = aUserSpaceRect;
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filterSpaceRect.Scale(mUserSpaceToFilterSpaceScale.width,
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mUserSpaceToFilterSpaceScale.height);
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return filterSpaceRect;
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}
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IntRect
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nsSVGFilterInstance::ComputeFilterPrimitiveSubregion(nsSVGFE* aFilterElement,
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const nsTArray<FilterPrimitiveDescription>& aPrimitiveDescrs,
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const nsTArray<int32_t>& aInputIndices)
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{
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nsSVGFE* fE = aFilterElement;
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IntRect defaultFilterSubregion(0,0,0,0);
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if (fE->SubregionIsUnionOfRegions()) {
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for (uint32_t i = 0; i < aInputIndices.Length(); ++i) {
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int32_t inputIndex = aInputIndices[i];
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bool isStandardInput = inputIndex < 0 || inputIndex == mSourceGraphicIndex;
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IntRect inputSubregion = isStandardInput ?
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mFilterSpaceBounds :
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aPrimitiveDescrs[inputIndex].PrimitiveSubregion();
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defaultFilterSubregion = defaultFilterSubregion.Union(inputSubregion);
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}
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} else {
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defaultFilterSubregion = mFilterSpaceBounds;
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}
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gfxRect feArea = nsSVGUtils::GetRelativeRect(mPrimitiveUnits,
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&fE->mLengthAttributes[nsSVGFE::ATTR_X], mTargetBBox, mMetrics);
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Rect region = ToRect(UserSpaceToFilterSpace(feArea));
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if (!fE->mLengthAttributes[nsSVGFE::ATTR_X].IsExplicitlySet())
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region.x = defaultFilterSubregion.X();
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if (!fE->mLengthAttributes[nsSVGFE::ATTR_Y].IsExplicitlySet())
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region.y = defaultFilterSubregion.Y();
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if (!fE->mLengthAttributes[nsSVGFE::ATTR_WIDTH].IsExplicitlySet())
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region.width = defaultFilterSubregion.Width();
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if (!fE->mLengthAttributes[nsSVGFE::ATTR_HEIGHT].IsExplicitlySet())
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region.height = defaultFilterSubregion.Height();
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// We currently require filter primitive subregions to be pixel-aligned.
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// Following the spec, any pixel partially in the region is included
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// in the region.
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region.RoundOut();
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return RoundedToInt(region);
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}
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void
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nsSVGFilterInstance::GetInputsAreTainted(const nsTArray<FilterPrimitiveDescription>& aPrimitiveDescrs,
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const nsTArray<int32_t>& aInputIndices,
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bool aFilterInputIsTainted,
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nsTArray<bool>& aOutInputsAreTainted)
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{
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for (uint32_t i = 0; i < aInputIndices.Length(); i++) {
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int32_t inputIndex = aInputIndices[i];
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if (inputIndex < 0) {
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aOutInputsAreTainted.AppendElement(aFilterInputIsTainted);
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} else {
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aOutInputsAreTainted.AppendElement(aPrimitiveDescrs[inputIndex].IsTainted());
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}
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}
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}
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static int32_t
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GetLastResultIndex(const nsTArray<FilterPrimitiveDescription>& aPrimitiveDescrs)
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{
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uint32_t numPrimitiveDescrs = aPrimitiveDescrs.Length();
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return !numPrimitiveDescrs ?
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FilterPrimitiveDescription::kPrimitiveIndexSourceGraphic :
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numPrimitiveDescrs - 1;
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}
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int32_t
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nsSVGFilterInstance::GetOrCreateSourceAlphaIndex(nsTArray<FilterPrimitiveDescription>& aPrimitiveDescrs)
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{
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// If the SourceAlpha index has already been determined or created for this
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// SVG filter, just return it.
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if (mSourceAlphaAvailable)
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return mSourceAlphaIndex;
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// If this is the first filter in the chain, we can just use the
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// kPrimitiveIndexSourceAlpha keyword to refer to the SourceAlpha of the
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// original image.
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if (mSourceGraphicIndex < 0) {
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mSourceAlphaIndex = FilterPrimitiveDescription::kPrimitiveIndexSourceAlpha;
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mSourceAlphaAvailable = true;
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return mSourceAlphaIndex;
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}
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// Otherwise, create a primitive description to turn the previous filter's
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// output into a SourceAlpha input.
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FilterPrimitiveDescription descr(PrimitiveType::ToAlpha);
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descr.SetInputPrimitive(0, mSourceGraphicIndex);
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const FilterPrimitiveDescription& sourcePrimitiveDescr =
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aPrimitiveDescrs[mSourceGraphicIndex];
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descr.SetPrimitiveSubregion(sourcePrimitiveDescr.PrimitiveSubregion());
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descr.SetIsTainted(sourcePrimitiveDescr.IsTainted());
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ColorSpace colorSpace = sourcePrimitiveDescr.OutputColorSpace();
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descr.SetInputColorSpace(0, colorSpace);
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descr.SetOutputColorSpace(colorSpace);
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aPrimitiveDescrs.AppendElement(descr);
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mSourceAlphaIndex = aPrimitiveDescrs.Length() - 1;
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mSourceAlphaAvailable = true;
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return mSourceAlphaIndex;
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}
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nsresult
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nsSVGFilterInstance::GetSourceIndices(nsSVGFE* aPrimitiveElement,
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nsTArray<FilterPrimitiveDescription>& aPrimitiveDescrs,
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const nsDataHashtable<nsStringHashKey, int32_t>& aImageTable,
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nsTArray<int32_t>& aSourceIndices)
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{
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AutoTArray<nsSVGStringInfo,2> sources;
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aPrimitiveElement->GetSourceImageNames(sources);
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for (uint32_t j = 0; j < sources.Length(); j++) {
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nsAutoString str;
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sources[j].mString->GetAnimValue(str, sources[j].mElement);
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int32_t sourceIndex = 0;
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if (str.EqualsLiteral("SourceGraphic")) {
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sourceIndex = mSourceGraphicIndex;
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} else if (str.EqualsLiteral("SourceAlpha")) {
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sourceIndex = GetOrCreateSourceAlphaIndex(aPrimitiveDescrs);
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} else if (str.EqualsLiteral("FillPaint")) {
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sourceIndex = FilterPrimitiveDescription::kPrimitiveIndexFillPaint;
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} else if (str.EqualsLiteral("StrokePaint")) {
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sourceIndex = FilterPrimitiveDescription::kPrimitiveIndexStrokePaint;
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} else if (str.EqualsLiteral("BackgroundImage") ||
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str.EqualsLiteral("BackgroundAlpha")) {
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return NS_ERROR_NOT_IMPLEMENTED;
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} else if (str.EqualsLiteral("")) {
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sourceIndex = GetLastResultIndex(aPrimitiveDescrs);
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} else {
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bool inputExists = aImageTable.Get(str, &sourceIndex);
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if (!inputExists)
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return NS_ERROR_FAILURE;
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}
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aSourceIndices.AppendElement(sourceIndex);
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}
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return NS_OK;
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}
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nsresult
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nsSVGFilterInstance::BuildPrimitives(nsTArray<FilterPrimitiveDescription>& aPrimitiveDescrs,
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nsTArray<RefPtr<SourceSurface>>& aInputImages,
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bool aInputIsTainted)
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{
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mSourceGraphicIndex = GetLastResultIndex(aPrimitiveDescrs);
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// Clip previous filter's output to this filter's filter region.
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if (mSourceGraphicIndex >= 0) {
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FilterPrimitiveDescription& sourceDescr = aPrimitiveDescrs[mSourceGraphicIndex];
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sourceDescr.SetPrimitiveSubregion(sourceDescr.PrimitiveSubregion().Intersect(mFilterSpaceBounds));
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}
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// Get the filter primitive elements.
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nsTArray<RefPtr<nsSVGFE> > primitives;
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for (nsIContent* child = mFilterElement->nsINode::GetFirstChild();
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child;
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child = child->GetNextSibling()) {
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RefPtr<nsSVGFE> primitive;
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CallQueryInterface(child, (nsSVGFE**)getter_AddRefs(primitive));
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if (primitive) {
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primitives.AppendElement(primitive);
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}
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}
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// Maps source image name to source index.
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nsDataHashtable<nsStringHashKey, int32_t> imageTable(8);
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// The principal that we check principals of any loaded images against.
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nsCOMPtr<nsIPrincipal> principal = mTargetContent->NodePrincipal();
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for (uint32_t primitiveElementIndex = 0;
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primitiveElementIndex < primitives.Length();
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++primitiveElementIndex) {
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nsSVGFE* filter = primitives[primitiveElementIndex];
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AutoTArray<int32_t,2> sourceIndices;
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nsresult rv = GetSourceIndices(filter, aPrimitiveDescrs, imageTable, sourceIndices);
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if (NS_FAILED(rv)) {
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return rv;
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}
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IntRect primitiveSubregion =
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ComputeFilterPrimitiveSubregion(filter, aPrimitiveDescrs, sourceIndices);
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nsTArray<bool> sourcesAreTainted;
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GetInputsAreTainted(aPrimitiveDescrs, sourceIndices, aInputIsTainted, sourcesAreTainted);
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FilterPrimitiveDescription descr =
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filter->GetPrimitiveDescription(this, primitiveSubregion, sourcesAreTainted, aInputImages);
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descr.SetIsTainted(filter->OutputIsTainted(sourcesAreTainted, principal));
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descr.SetFilterSpaceBounds(mFilterSpaceBounds);
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descr.SetPrimitiveSubregion(primitiveSubregion.Intersect(descr.FilterSpaceBounds()));
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for (uint32_t i = 0; i < sourceIndices.Length(); i++) {
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int32_t inputIndex = sourceIndices[i];
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descr.SetInputPrimitive(i, inputIndex);
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ColorSpace inputColorSpace = inputIndex >= 0
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? aPrimitiveDescrs[inputIndex].OutputColorSpace()
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: ColorSpace(ColorSpace::SRGB);
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ColorSpace desiredInputColorSpace = filter->GetInputColorSpace(i, inputColorSpace);
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descr.SetInputColorSpace(i, desiredInputColorSpace);
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if (i == 0) {
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// the output color space is whatever in1 is if there is an in1
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descr.SetOutputColorSpace(desiredInputColorSpace);
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}
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}
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if (sourceIndices.Length() == 0) {
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descr.SetOutputColorSpace(filter->GetOutputColorSpace());
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}
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aPrimitiveDescrs.AppendElement(descr);
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uint32_t primitiveDescrIndex = aPrimitiveDescrs.Length() - 1;
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nsAutoString str;
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filter->GetResultImageName().GetAnimValue(str, filter);
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imageTable.Put(str, primitiveDescrIndex);
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}
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return NS_OK;
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}
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