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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
commit36d22d82aa202bb199967e9512281e9a53db42c9 (patch)
tree105e8c98ddea1c1e4784a60a5a6410fa416be2de /dom/svg/SVGContentUtils.cpp
parentInitial commit. (diff)
downloadfirefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz
firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip
Adding upstream version 115.7.0esr.upstream/115.7.0esr
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'dom/svg/SVGContentUtils.cpp')
-rw-r--r--dom/svg/SVGContentUtils.cpp859
1 files changed, 859 insertions, 0 deletions
diff --git a/dom/svg/SVGContentUtils.cpp b/dom/svg/SVGContentUtils.cpp
new file mode 100644
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+++ b/dom/svg/SVGContentUtils.cpp
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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:
+// This is also necessary to ensure our definition of M_SQRT1_2 is picked up
+#include "SVGContentUtils.h"
+
+// Keep others in (case-insensitive) order:
+#include "gfx2DGlue.h"
+#include "gfxMatrix.h"
+#include "gfxPlatform.h"
+#include "mozilla/gfx/2D.h"
+#include "mozilla/dom/SVGSVGElement.h"
+#include "mozilla/PresShell.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/SVGContextPaint.h"
+#include "mozilla/SVGUtils.h"
+#include "mozilla/TextUtils.h"
+#include "nsComputedDOMStyle.h"
+#include "nsContainerFrame.h"
+#include "nsFontMetrics.h"
+#include "nsIFrame.h"
+#include "nsIScriptError.h"
+#include "nsLayoutUtils.h"
+#include "nsMathUtils.h"
+#include "nsWhitespaceTokenizer.h"
+#include "SVGAnimatedPreserveAspectRatio.h"
+#include "SVGGeometryProperty.h"
+#include "nsContentUtils.h"
+#include "mozilla/gfx/Types.h"
+#include "mozilla/FloatingPoint.h"
+#include "mozilla/ComputedStyle.h"
+#include "SVGPathDataParser.h"
+#include "SVGPathData.h"
+#include "SVGPathElement.h"
+
+using namespace mozilla;
+using namespace mozilla::dom;
+using namespace mozilla::dom::SVGPreserveAspectRatio_Binding;
+using namespace mozilla::gfx;
+
+static bool ParseNumber(RangedPtr<const char16_t>& aIter,
+ const RangedPtr<const char16_t>& aEnd, double& aValue) {
+ int32_t sign;
+ if (!SVGContentUtils::ParseOptionalSign(aIter, aEnd, sign)) {
+ return false;
+ }
+
+ // Absolute value of the integer part of the mantissa.
+ double intPart = 0.0;
+
+ bool gotDot = *aIter == '.';
+
+ if (!gotDot) {
+ if (!mozilla::IsAsciiDigit(*aIter)) {
+ return false;
+ }
+ do {
+ intPart = 10.0 * intPart + mozilla::AsciiAlphanumericToNumber(*aIter);
+ ++aIter;
+ } while (aIter != aEnd && mozilla::IsAsciiDigit(*aIter));
+
+ if (aIter != aEnd) {
+ gotDot = *aIter == '.';
+ }
+ }
+
+ // Fractional part of the mantissa.
+ double fracPart = 0.0;
+
+ if (gotDot) {
+ ++aIter;
+ if (aIter == aEnd || !mozilla::IsAsciiDigit(*aIter)) {
+ return false;
+ }
+
+ // Power of ten by which we need to divide the fraction
+ double divisor = 1.0;
+
+ do {
+ fracPart = 10.0 * fracPart + mozilla::AsciiAlphanumericToNumber(*aIter);
+ divisor *= 10.0;
+ ++aIter;
+ } while (aIter != aEnd && mozilla::IsAsciiDigit(*aIter));
+
+ fracPart /= divisor;
+ }
+
+ bool gotE = false;
+ int32_t exponent = 0;
+ int32_t expSign;
+
+ if (aIter != aEnd && (*aIter == 'e' || *aIter == 'E')) {
+ RangedPtr<const char16_t> expIter(aIter);
+
+ ++expIter;
+ if (expIter != aEnd) {
+ expSign = *expIter == '-' ? -1 : 1;
+ if (*expIter == '-' || *expIter == '+') {
+ ++expIter;
+ }
+ if (expIter != aEnd && mozilla::IsAsciiDigit(*expIter)) {
+ // At this point we're sure this is an exponent
+ // and not the start of a unit such as em or ex.
+ gotE = true;
+ }
+ }
+
+ if (gotE) {
+ aIter = expIter;
+ do {
+ exponent = 10.0 * exponent + mozilla::AsciiAlphanumericToNumber(*aIter);
+ ++aIter;
+ } while (aIter != aEnd && mozilla::IsAsciiDigit(*aIter));
+ }
+ }
+
+ // Assemble the number
+ aValue = sign * (intPart + fracPart);
+ if (gotE) {
+ aValue *= pow(10.0, expSign * exponent);
+ }
+ return true;
+}
+
+namespace mozilla {
+
+SVGSVGElement* SVGContentUtils::GetOuterSVGElement(SVGElement* aSVGElement) {
+ Element* element = nullptr;
+ Element* ancestor = aSVGElement->GetParentElementCrossingShadowRoot();
+
+ while (ancestor && ancestor->IsSVGElement() &&
+ !ancestor->IsSVGElement(nsGkAtoms::foreignObject)) {
+ element = ancestor;
+ ancestor = element->GetParentElementCrossingShadowRoot();
+ }
+
+ return SVGSVGElement::FromNodeOrNull(element);
+}
+
+enum DashState {
+ eDashedStroke,
+ eContinuousStroke, //< all dashes, no gaps
+ eNoStroke //< all gaps, no dashes
+};
+
+static DashState GetStrokeDashData(
+ SVGContentUtils::AutoStrokeOptions* aStrokeOptions, SVGElement* aElement,
+ const nsStyleSVG* aStyleSVG, const SVGContextPaint* aContextPaint) {
+ size_t dashArrayLength;
+ Float totalLengthOfDashes = 0.0, totalLengthOfGaps = 0.0;
+ Float pathScale = 1.0;
+
+ if (aStyleSVG->mStrokeDasharray.IsContextValue()) {
+ if (!aContextPaint) {
+ return eContinuousStroke;
+ }
+ const FallibleTArray<Float>& dashSrc = aContextPaint->GetStrokeDashArray();
+ dashArrayLength = dashSrc.Length();
+ if (dashArrayLength <= 0) {
+ return eContinuousStroke;
+ }
+ Float* dashPattern = aStrokeOptions->InitDashPattern(dashArrayLength);
+ if (!dashPattern) {
+ return eContinuousStroke;
+ }
+ for (size_t i = 0; i < dashArrayLength; i++) {
+ if (dashSrc[i] < 0.0) {
+ return eContinuousStroke; // invalid
+ }
+ dashPattern[i] = Float(dashSrc[i]);
+ (i % 2 ? totalLengthOfGaps : totalLengthOfDashes) += dashSrc[i];
+ }
+ } else {
+ const auto dasharray = aStyleSVG->mStrokeDasharray.AsValues().AsSpan();
+ dashArrayLength = dasharray.Length();
+ if (dashArrayLength <= 0) {
+ return eContinuousStroke;
+ }
+ if (auto* shapeElement = SVGGeometryElement::FromNode(aElement)) {
+ pathScale =
+ shapeElement->GetPathLengthScale(SVGGeometryElement::eForStroking);
+ if (pathScale <= 0 || !std::isfinite(pathScale)) {
+ return eContinuousStroke;
+ }
+ }
+ Float* dashPattern = aStrokeOptions->InitDashPattern(dashArrayLength);
+ if (!dashPattern) {
+ return eContinuousStroke;
+ }
+ for (uint32_t i = 0; i < dashArrayLength; i++) {
+ Float dashLength =
+ SVGContentUtils::CoordToFloat(aElement, dasharray[i]) * pathScale;
+ if (dashLength < 0.0) {
+ return eContinuousStroke; // invalid
+ }
+ dashPattern[i] = dashLength;
+ (i % 2 ? totalLengthOfGaps : totalLengthOfDashes) += dashLength;
+ }
+ }
+
+ // Now that aStrokeOptions.mDashPattern is fully initialized (we didn't
+ // return early above) we can safely set mDashLength:
+ aStrokeOptions->mDashLength = dashArrayLength;
+
+ if ((dashArrayLength % 2) == 1) {
+ // If we have a dash pattern with an odd number of lengths the pattern
+ // repeats a second time, per the SVG spec., and as implemented by Moz2D.
+ // When deciding whether to return eNoStroke or eContinuousStroke below we
+ // need to take into account that in the repeat pattern the dashes become
+ // gaps, and the gaps become dashes.
+ Float origTotalLengthOfDashes = totalLengthOfDashes;
+ totalLengthOfDashes += totalLengthOfGaps;
+ totalLengthOfGaps += origTotalLengthOfDashes;
+ }
+
+ // Stroking using dashes is much slower than stroking a continuous line
+ // (see bug 609361 comment 40), and much, much slower than not stroking the
+ // line at all. Here we check for cases when the dash pattern causes the
+ // stroke to essentially be continuous or to be nonexistent in which case
+ // we can avoid expensive stroking operations (the underlying platform
+ // graphics libraries don't seem to optimize for this).
+ if (totalLengthOfGaps <= 0) {
+ return eContinuousStroke;
+ }
+ // We can only return eNoStroke if the value of stroke-linecap isn't
+ // adding caps to zero length dashes.
+ if (totalLengthOfDashes <= 0 &&
+ aStyleSVG->mStrokeLinecap == StyleStrokeLinecap::Butt) {
+ return eNoStroke;
+ }
+
+ if (aStyleSVG->mStrokeDashoffset.IsContextValue()) {
+ aStrokeOptions->mDashOffset =
+ Float(aContextPaint ? aContextPaint->GetStrokeDashOffset() : 0);
+ } else {
+ aStrokeOptions->mDashOffset =
+ SVGContentUtils::CoordToFloat(
+ aElement, aStyleSVG->mStrokeDashoffset.AsLengthPercentage()) *
+ pathScale;
+ }
+
+ return eDashedStroke;
+}
+
+void SVGContentUtils::GetStrokeOptions(AutoStrokeOptions* aStrokeOptions,
+ SVGElement* aElement,
+ const ComputedStyle* aComputedStyle,
+ const SVGContextPaint* aContextPaint,
+ StrokeOptionFlags aFlags) {
+ auto doCompute = [&](const ComputedStyle* computedStyle) {
+ const nsStyleSVG* styleSVG = computedStyle->StyleSVG();
+
+ bool checkedDashAndStrokeIsDashed = false;
+ if (aFlags != eIgnoreStrokeDashing) {
+ DashState dashState =
+ GetStrokeDashData(aStrokeOptions, aElement, styleSVG, aContextPaint);
+
+ if (dashState == eNoStroke) {
+ // Hopefully this will shortcircuit any stroke operations:
+ aStrokeOptions->mLineWidth = 0;
+ return;
+ }
+ if (dashState == eContinuousStroke && aStrokeOptions->mDashPattern) {
+ // Prevent our caller from wasting time looking at a pattern without
+ // gaps:
+ aStrokeOptions->DiscardDashPattern();
+ }
+ checkedDashAndStrokeIsDashed = (dashState == eDashedStroke);
+ }
+
+ aStrokeOptions->mLineWidth =
+ GetStrokeWidth(aElement, computedStyle, aContextPaint);
+
+ aStrokeOptions->mMiterLimit = Float(styleSVG->mStrokeMiterlimit);
+
+ switch (styleSVG->mStrokeLinejoin) {
+ case StyleStrokeLinejoin::Miter:
+ aStrokeOptions->mLineJoin = JoinStyle::MITER_OR_BEVEL;
+ break;
+ case StyleStrokeLinejoin::Round:
+ aStrokeOptions->mLineJoin = JoinStyle::ROUND;
+ break;
+ case StyleStrokeLinejoin::Bevel:
+ aStrokeOptions->mLineJoin = JoinStyle::BEVEL;
+ break;
+ }
+
+ if (ShapeTypeHasNoCorners(aElement) && !checkedDashAndStrokeIsDashed) {
+ // Note: if aFlags == eIgnoreStrokeDashing then we may be returning the
+ // wrong linecap value here, since the actual linecap used on render in
+ // this case depends on whether the stroke is dashed or not.
+ aStrokeOptions->mLineCap = CapStyle::BUTT;
+ } else {
+ switch (styleSVG->mStrokeLinecap) {
+ case StyleStrokeLinecap::Butt:
+ aStrokeOptions->mLineCap = CapStyle::BUTT;
+ break;
+ case StyleStrokeLinecap::Round:
+ aStrokeOptions->mLineCap = CapStyle::ROUND;
+ break;
+ case StyleStrokeLinecap::Square:
+ aStrokeOptions->mLineCap = CapStyle::SQUARE;
+ break;
+ }
+ }
+ };
+
+ if (aComputedStyle) {
+ doCompute(aComputedStyle);
+ } else {
+ SVGGeometryProperty::DoForComputedStyle(aElement, doCompute);
+ }
+}
+
+Float SVGContentUtils::GetStrokeWidth(const SVGElement* aElement,
+ const ComputedStyle* aComputedStyle,
+ const SVGContextPaint* aContextPaint) {
+ Float res = 0.0;
+
+ auto doCompute = [&](const ComputedStyle* computedStyle) {
+ const nsStyleSVG* styleSVG = computedStyle->StyleSVG();
+
+ if (styleSVG->mStrokeWidth.IsContextValue()) {
+ res = aContextPaint ? aContextPaint->GetStrokeWidth() : 1.0;
+ } else {
+ auto& lp = styleSVG->mStrokeWidth.AsLengthPercentage();
+ if (lp.HasPercent() && aElement) {
+ auto counter =
+ aElement->IsSVGElement(nsGkAtoms::text)
+ ? UseCounter::eUseCounter_custom_PercentageStrokeWidthInSVGText
+ : UseCounter::eUseCounter_custom_PercentageStrokeWidthInSVG;
+ aElement->OwnerDoc()->SetUseCounter(counter);
+ }
+ res = SVGContentUtils::CoordToFloat(aElement, lp);
+ }
+ };
+
+ if (aComputedStyle) {
+ doCompute(aComputedStyle);
+ } else {
+ SVGGeometryProperty::DoForComputedStyle(aElement, doCompute);
+ }
+
+ return res;
+}
+
+float SVGContentUtils::GetFontSize(const Element* aElement) {
+ if (!aElement) {
+ return 1.0f;
+ }
+
+ nsPresContext* pc = nsContentUtils::GetContextForContent(aElement);
+ if (!pc) {
+ return 1.0f;
+ }
+
+ if (auto* f = aElement->GetPrimaryFrame()) {
+ return GetFontSize(f->Style(), pc);
+ }
+
+ if (RefPtr<const ComputedStyle> style =
+ nsComputedDOMStyle::GetComputedStyleNoFlush(aElement)) {
+ return GetFontSize(style, pc);
+ }
+
+ // ReportToConsole
+ NS_WARNING("Couldn't get ComputedStyle for content in GetFontStyle");
+ return 1.0f;
+}
+
+float SVGContentUtils::GetFontSize(const nsIFrame* aFrame) {
+ MOZ_ASSERT(aFrame, "NULL frame in GetFontSize");
+ return GetFontSize(aFrame->Style(), aFrame->PresContext());
+}
+
+float SVGContentUtils::GetFontSize(const ComputedStyle* aComputedStyle,
+ nsPresContext* aPresContext) {
+ MOZ_ASSERT(aComputedStyle);
+ MOZ_ASSERT(aPresContext);
+
+ return aComputedStyle->StyleFont()->mSize.ToCSSPixels() /
+ aPresContext->TextZoom();
+}
+
+float SVGContentUtils::GetFontXHeight(const Element* aElement) {
+ if (!aElement) {
+ return 1.0f;
+ }
+
+ nsPresContext* pc = nsContentUtils::GetContextForContent(aElement);
+ if (!pc) {
+ return 1.0f;
+ }
+
+ if (auto* f = aElement->GetPrimaryFrame()) {
+ return GetFontXHeight(f->Style(), pc);
+ }
+
+ if (RefPtr<const ComputedStyle> style =
+ nsComputedDOMStyle::GetComputedStyleNoFlush(aElement)) {
+ return GetFontXHeight(style, pc);
+ }
+
+ // ReportToConsole
+ NS_WARNING("Couldn't get ComputedStyle for content in GetFontStyle");
+ return 1.0f;
+}
+
+float SVGContentUtils::GetFontXHeight(const nsIFrame* aFrame) {
+ MOZ_ASSERT(aFrame, "NULL frame in GetFontXHeight");
+ return GetFontXHeight(aFrame->Style(), aFrame->PresContext());
+}
+
+float SVGContentUtils::GetFontXHeight(const ComputedStyle* aComputedStyle,
+ nsPresContext* aPresContext) {
+ MOZ_ASSERT(aComputedStyle && aPresContext);
+
+ RefPtr<nsFontMetrics> fontMetrics =
+ nsLayoutUtils::GetFontMetricsForComputedStyle(aComputedStyle,
+ aPresContext);
+
+ if (!fontMetrics) {
+ // ReportToConsole
+ NS_WARNING("no FontMetrics in GetFontXHeight()");
+ return 1.0f;
+ }
+
+ nscoord xHeight = fontMetrics->XHeight();
+ return nsPresContext::AppUnitsToFloatCSSPixels(xHeight) /
+ aPresContext->TextZoom();
+}
+nsresult SVGContentUtils::ReportToConsole(const Document* doc,
+ const char* aWarning,
+ const nsTArray<nsString>& aParams) {
+ return nsContentUtils::ReportToConsole(nsIScriptError::warningFlag, "SVG"_ns,
+ doc, nsContentUtils::eSVG_PROPERTIES,
+ aWarning, aParams);
+}
+
+bool SVGContentUtils::EstablishesViewport(const nsIContent* aContent) {
+ // Although SVG 1.1 states that <image> is an element that establishes a
+ // viewport, this is really only for the document it references, not
+ // for any child content, which is what this function is used for.
+ return aContent &&
+ aContent->IsAnyOfSVGElements(nsGkAtoms::svg, nsGkAtoms::foreignObject,
+ nsGkAtoms::symbol);
+}
+
+SVGViewportElement* SVGContentUtils::GetNearestViewportElement(
+ const nsIContent* aContent) {
+ nsIContent* element = aContent->GetFlattenedTreeParent();
+
+ while (element && element->IsSVGElement()) {
+ if (EstablishesViewport(element)) {
+ if (element->IsSVGElement(nsGkAtoms::foreignObject)) {
+ return nullptr;
+ }
+ MOZ_ASSERT(element->IsAnyOfSVGElements(nsGkAtoms::svg, nsGkAtoms::symbol),
+ "upcoming static_cast is only valid for "
+ "SVGViewportElement subclasses");
+ return static_cast<SVGViewportElement*>(element);
+ }
+ element = element->GetFlattenedTreeParent();
+ }
+ return nullptr;
+}
+
+static gfx::Matrix GetCTMInternal(SVGElement* aElement, bool aScreenCTM,
+ bool aHaveRecursed) {
+ auto getLocalTransformHelper =
+ [](SVGElement const* e, bool shouldIncludeChildToUserSpace) -> gfxMatrix {
+ gfxMatrix ret;
+
+ if (auto* f = e->GetPrimaryFrame()) {
+ ret = SVGUtils::GetTransformMatrixInUserSpace(f);
+ } else {
+ // FIXME: Ideally we should also return the correct matrix
+ // for display:none, but currently transform related code relies
+ // heavily on the present of a frame.
+ // For now we just fall back to |PrependLocalTransformsTo| which
+ // doesn't account for CSS transform.
+ ret = e->PrependLocalTransformsTo({}, eUserSpaceToParent);
+ }
+
+ if (shouldIncludeChildToUserSpace) {
+ ret = e->PrependLocalTransformsTo({}, eChildToUserSpace) * ret;
+ }
+
+ return ret;
+ };
+
+ gfxMatrix matrix = getLocalTransformHelper(aElement, aHaveRecursed);
+
+ SVGElement* element = aElement;
+ nsIContent* ancestor = aElement->GetFlattenedTreeParent();
+
+ while (ancestor && ancestor->IsSVGElement() &&
+ !ancestor->IsSVGElement(nsGkAtoms::foreignObject)) {
+ element = static_cast<SVGElement*>(ancestor);
+ matrix *= getLocalTransformHelper(element, true);
+ if (!aScreenCTM && SVGContentUtils::EstablishesViewport(element)) {
+ if (!element->IsAnyOfSVGElements(nsGkAtoms::svg, nsGkAtoms::symbol)) {
+ NS_ERROR("New (SVG > 1.1) SVG viewport establishing element?");
+ return gfx::Matrix(0.0, 0.0, 0.0, 0.0, 0.0, 0.0); // singular
+ }
+ // XXX spec seems to say x,y translation should be undone for IsInnerSVG
+ return gfx::ToMatrix(matrix);
+ }
+ ancestor = ancestor->GetFlattenedTreeParent();
+ }
+ if (!aScreenCTM) {
+ // didn't find a nearestViewportElement
+ return gfx::Matrix(0.0, 0.0, 0.0, 0.0, 0.0, 0.0); // singular
+ }
+ if (!element->IsSVGElement(nsGkAtoms::svg)) {
+ // Not a valid SVG fragment
+ return gfx::Matrix(0.0, 0.0, 0.0, 0.0, 0.0, 0.0); // singular
+ }
+ if (element == aElement && !aHaveRecursed) {
+ // We get here when getScreenCTM() is called on an outer-<svg>.
+ // Consistency with other elements would have us include only the
+ // eFromUserSpace transforms, but we include the eAllTransforms
+ // transforms in this case since that's what we've been doing for
+ // a while, and it keeps us consistent with WebKit and Opera (if not
+ // really with the ambiguous spec).
+ matrix = getLocalTransformHelper(aElement, true);
+ }
+
+ if (auto* f = element->GetPrimaryFrame()) {
+ if (f->IsSVGOuterSVGFrame()) {
+ nsMargin bp = f->GetUsedBorderAndPadding();
+ matrix.PostTranslate(
+ NSAppUnitsToFloatPixels(bp.left, AppUnitsPerCSSPixel()),
+ NSAppUnitsToFloatPixels(bp.top, AppUnitsPerCSSPixel()));
+ }
+ }
+
+ if (!ancestor || !ancestor->IsElement()) {
+ return gfx::ToMatrix(matrix);
+ }
+ if (auto* ancestorSVG = SVGElement::FromNode(ancestor)) {
+ return gfx::ToMatrix(matrix) * GetCTMInternal(ancestorSVG, true, true);
+ }
+
+ // XXX this does not take into account CSS transform, or that the non-SVG
+ // content that we've hit may itself be inside an SVG foreignObject higher up
+ Document* currentDoc = aElement->GetComposedDoc();
+ float x = 0.0f, y = 0.0f;
+ if (currentDoc && element->IsSVGElement(nsGkAtoms::svg)) {
+ PresShell* presShell = currentDoc->GetPresShell();
+ if (presShell) {
+ nsIFrame* frame = element->GetPrimaryFrame();
+ nsIFrame* ancestorFrame = presShell->GetRootFrame();
+ if (frame && ancestorFrame) {
+ nsPoint point = frame->GetOffsetTo(ancestorFrame);
+ x = nsPresContext::AppUnitsToFloatCSSPixels(point.x);
+ y = nsPresContext::AppUnitsToFloatCSSPixels(point.y);
+ }
+ }
+ }
+ return ToMatrix(matrix).PostTranslate(x, y);
+}
+
+gfx::Matrix SVGContentUtils::GetCTM(SVGElement* aElement, bool aScreenCTM) {
+ return GetCTMInternal(aElement, aScreenCTM, false);
+}
+
+void SVGContentUtils::RectilinearGetStrokeBounds(
+ const Rect& aRect, const Matrix& aToBoundsSpace,
+ const Matrix& aToNonScalingStrokeSpace, float aStrokeWidth, Rect* aBounds) {
+ MOZ_ASSERT(aToBoundsSpace.IsRectilinear(),
+ "aToBoundsSpace must be rectilinear");
+ MOZ_ASSERT(aToNonScalingStrokeSpace.IsRectilinear(),
+ "aToNonScalingStrokeSpace must be rectilinear");
+
+ Matrix nonScalingToSource = aToNonScalingStrokeSpace.Inverse();
+ Matrix nonScalingToBounds = nonScalingToSource * aToBoundsSpace;
+
+ *aBounds = aToBoundsSpace.TransformBounds(aRect);
+
+ // Compute the amounts dx and dy that nonScalingToBounds scales a half-width
+ // stroke in the x and y directions, and then inflate aBounds by those amounts
+ // so that when aBounds is transformed back to non-scaling-stroke space
+ // it will map onto the correct stroked bounds.
+
+ Float dx = 0.0f;
+ Float dy = 0.0f;
+ // nonScalingToBounds is rectilinear, so either _12 and _21 are zero or _11
+ // and _22 are zero, and in each case the non-zero entries (from among _11,
+ // _12, _21, _22) simply scale the stroke width in the x and y directions.
+ if (FuzzyEqual(nonScalingToBounds._12, 0) &&
+ FuzzyEqual(nonScalingToBounds._21, 0)) {
+ dx = (aStrokeWidth / 2.0f) * std::abs(nonScalingToBounds._11);
+ dy = (aStrokeWidth / 2.0f) * std::abs(nonScalingToBounds._22);
+ } else {
+ dx = (aStrokeWidth / 2.0f) * std::abs(nonScalingToBounds._21);
+ dy = (aStrokeWidth / 2.0f) * std::abs(nonScalingToBounds._12);
+ }
+
+ aBounds->Inflate(dx, dy);
+}
+
+double SVGContentUtils::ComputeNormalizedHypotenuse(double aWidth,
+ double aHeight) {
+ return NS_hypot(aWidth, aHeight) / M_SQRT2;
+}
+
+float SVGContentUtils::AngleBisect(float a1, float a2) {
+ float delta = std::fmod(a2 - a1, static_cast<float>(2 * M_PI));
+ if (delta < 0) {
+ delta += static_cast<float>(2 * M_PI);
+ }
+ /* delta is now the angle from a1 around to a2, in the range [0, 2*M_PI) */
+ float r = a1 + delta / 2;
+ if (delta >= M_PI) {
+ /* the arc from a2 to a1 is smaller, so use the ray on that side */
+ r += static_cast<float>(M_PI);
+ }
+ return r;
+}
+
+gfx::Matrix SVGContentUtils::GetViewBoxTransform(
+ float aViewportWidth, float aViewportHeight, float aViewboxX,
+ float aViewboxY, float aViewboxWidth, float aViewboxHeight,
+ const SVGAnimatedPreserveAspectRatio& aPreserveAspectRatio) {
+ return GetViewBoxTransform(aViewportWidth, aViewportHeight, aViewboxX,
+ aViewboxY, aViewboxWidth, aViewboxHeight,
+ aPreserveAspectRatio.GetAnimValue());
+}
+
+gfx::Matrix SVGContentUtils::GetViewBoxTransform(
+ float aViewportWidth, float aViewportHeight, float aViewboxX,
+ float aViewboxY, float aViewboxWidth, float aViewboxHeight,
+ const SVGPreserveAspectRatio& aPreserveAspectRatio) {
+ NS_ASSERTION(aViewportWidth >= 0, "viewport width must be nonnegative!");
+ NS_ASSERTION(aViewportHeight >= 0, "viewport height must be nonnegative!");
+ NS_ASSERTION(aViewboxWidth > 0, "viewBox width must be greater than zero!");
+ NS_ASSERTION(aViewboxHeight > 0, "viewBox height must be greater than zero!");
+
+ uint16_t align = aPreserveAspectRatio.GetAlign();
+ uint16_t meetOrSlice = aPreserveAspectRatio.GetMeetOrSlice();
+
+ // default to the defaults
+ if (align == SVG_PRESERVEASPECTRATIO_UNKNOWN)
+ align = SVG_PRESERVEASPECTRATIO_XMIDYMID;
+ if (meetOrSlice == SVG_MEETORSLICE_UNKNOWN)
+ meetOrSlice = SVG_MEETORSLICE_MEET;
+
+ float a, d, e, f;
+ a = aViewportWidth / aViewboxWidth;
+ d = aViewportHeight / aViewboxHeight;
+ e = 0.0f;
+ f = 0.0f;
+
+ if (align != SVG_PRESERVEASPECTRATIO_NONE && a != d) {
+ if ((meetOrSlice == SVG_MEETORSLICE_MEET && a < d) ||
+ (meetOrSlice == SVG_MEETORSLICE_SLICE && d < a)) {
+ d = a;
+ switch (align) {
+ case SVG_PRESERVEASPECTRATIO_XMINYMIN:
+ case SVG_PRESERVEASPECTRATIO_XMIDYMIN:
+ case SVG_PRESERVEASPECTRATIO_XMAXYMIN:
+ break;
+ case SVG_PRESERVEASPECTRATIO_XMINYMID:
+ case SVG_PRESERVEASPECTRATIO_XMIDYMID:
+ case SVG_PRESERVEASPECTRATIO_XMAXYMID:
+ f = (aViewportHeight - a * aViewboxHeight) / 2.0f;
+ break;
+ case SVG_PRESERVEASPECTRATIO_XMINYMAX:
+ case SVG_PRESERVEASPECTRATIO_XMIDYMAX:
+ case SVG_PRESERVEASPECTRATIO_XMAXYMAX:
+ f = aViewportHeight - a * aViewboxHeight;
+ break;
+ default:
+ MOZ_ASSERT_UNREACHABLE("Unknown value for align");
+ }
+ } else if ((meetOrSlice == SVG_MEETORSLICE_MEET && d < a) ||
+ (meetOrSlice == SVG_MEETORSLICE_SLICE && a < d)) {
+ a = d;
+ switch (align) {
+ case SVG_PRESERVEASPECTRATIO_XMINYMIN:
+ case SVG_PRESERVEASPECTRATIO_XMINYMID:
+ case SVG_PRESERVEASPECTRATIO_XMINYMAX:
+ break;
+ case SVG_PRESERVEASPECTRATIO_XMIDYMIN:
+ case SVG_PRESERVEASPECTRATIO_XMIDYMID:
+ case SVG_PRESERVEASPECTRATIO_XMIDYMAX:
+ e = (aViewportWidth - a * aViewboxWidth) / 2.0f;
+ break;
+ case SVG_PRESERVEASPECTRATIO_XMAXYMIN:
+ case SVG_PRESERVEASPECTRATIO_XMAXYMID:
+ case SVG_PRESERVEASPECTRATIO_XMAXYMAX:
+ e = aViewportWidth - a * aViewboxWidth;
+ break;
+ default:
+ MOZ_ASSERT_UNREACHABLE("Unknown value for align");
+ }
+ } else
+ MOZ_ASSERT_UNREACHABLE("Unknown value for meetOrSlice");
+ }
+
+ if (aViewboxX) e += -a * aViewboxX;
+ if (aViewboxY) f += -d * aViewboxY;
+
+ return gfx::Matrix(a, 0.0f, 0.0f, d, e, f);
+}
+
+template <class floatType>
+bool SVGContentUtils::ParseNumber(RangedPtr<const char16_t>& aIter,
+ const RangedPtr<const char16_t>& aEnd,
+ floatType& aValue) {
+ RangedPtr<const char16_t> iter(aIter);
+
+ double value;
+ if (!::ParseNumber(iter, aEnd, value)) {
+ return false;
+ }
+ floatType floatValue = floatType(value);
+ if (!std::isfinite(floatValue)) {
+ return false;
+ }
+ aValue = floatValue;
+ aIter = iter;
+ return true;
+}
+
+template bool SVGContentUtils::ParseNumber<float>(
+ RangedPtr<const char16_t>& aIter, const RangedPtr<const char16_t>& aEnd,
+ float& aValue);
+
+template bool SVGContentUtils::ParseNumber<double>(
+ RangedPtr<const char16_t>& aIter, const RangedPtr<const char16_t>& aEnd,
+ double& aValue);
+
+RangedPtr<const char16_t> SVGContentUtils::GetStartRangedPtr(
+ const nsAString& aString) {
+ return RangedPtr<const char16_t>(aString.Data(), aString.Length());
+}
+
+RangedPtr<const char16_t> SVGContentUtils::GetEndRangedPtr(
+ const nsAString& aString) {
+ return RangedPtr<const char16_t>(aString.Data() + aString.Length(),
+ aString.Data(), aString.Length());
+}
+
+template <class floatType>
+bool SVGContentUtils::ParseNumber(const nsAString& aString, floatType& aValue) {
+ RangedPtr<const char16_t> iter = GetStartRangedPtr(aString);
+ const RangedPtr<const char16_t> end = GetEndRangedPtr(aString);
+
+ return ParseNumber(iter, end, aValue) && iter == end;
+}
+
+template bool SVGContentUtils::ParseNumber<float>(const nsAString& aString,
+ float& aValue);
+template bool SVGContentUtils::ParseNumber<double>(const nsAString& aString,
+ double& aValue);
+
+/* static */
+bool SVGContentUtils::ParseInteger(RangedPtr<const char16_t>& aIter,
+ const RangedPtr<const char16_t>& aEnd,
+ int32_t& aValue) {
+ RangedPtr<const char16_t> iter(aIter);
+
+ int32_t sign;
+ if (!ParseOptionalSign(iter, aEnd, sign)) {
+ return false;
+ }
+
+ if (!mozilla::IsAsciiDigit(*iter)) {
+ return false;
+ }
+
+ int64_t value = 0;
+
+ do {
+ if (value <= std::numeric_limits<int32_t>::max()) {
+ value = 10 * value + mozilla::AsciiAlphanumericToNumber(*iter);
+ }
+ ++iter;
+ } while (iter != aEnd && mozilla::IsAsciiDigit(*iter));
+
+ aIter = iter;
+ aValue = int32_t(clamped(sign * value,
+ int64_t(std::numeric_limits<int32_t>::min()),
+ int64_t(std::numeric_limits<int32_t>::max())));
+ return true;
+}
+
+/* static */
+bool SVGContentUtils::ParseInteger(const nsAString& aString, int32_t& aValue) {
+ RangedPtr<const char16_t> iter = GetStartRangedPtr(aString);
+ const RangedPtr<const char16_t> end = GetEndRangedPtr(aString);
+
+ return ParseInteger(iter, end, aValue) && iter == end;
+}
+
+float SVGContentUtils::CoordToFloat(const SVGElement* aContent,
+ const LengthPercentage& aLength,
+ uint8_t aCtxType) {
+ float result = aLength.ResolveToCSSPixelsWith([&] {
+ SVGViewportElement* ctx = aContent->GetCtx();
+ return CSSCoord(ctx ? ctx->GetLength(aCtxType) : 0.0f);
+ });
+ if (aLength.IsCalc()) {
+ const auto& calc = aLength.AsCalc();
+ if (calc.clamping_mode == StyleAllowedNumericType::NonNegative) {
+ result = std::max(result, 0.0f);
+ } else {
+ MOZ_ASSERT(calc.clamping_mode == StyleAllowedNumericType::All);
+ }
+ }
+ return result;
+}
+
+already_AddRefed<gfx::Path> SVGContentUtils::GetPath(
+ const nsAString& aPathString) {
+ SVGPathData pathData;
+ SVGPathDataParser parser(aPathString, &pathData);
+ if (!parser.Parse()) {
+ return nullptr;
+ }
+
+ RefPtr<DrawTarget> drawTarget =
+ gfxPlatform::ThreadLocalScreenReferenceDrawTarget();
+ RefPtr<PathBuilder> builder =
+ drawTarget->CreatePathBuilder(FillRule::FILL_WINDING);
+
+ return pathData.BuildPath(builder, StyleStrokeLinecap::Butt, 1);
+}
+
+bool SVGContentUtils::ShapeTypeHasNoCorners(const nsIContent* aContent) {
+ return aContent &&
+ aContent->IsAnyOfSVGElements(nsGkAtoms::circle, nsGkAtoms::ellipse);
+}
+
+nsDependentSubstring SVGContentUtils::GetAndEnsureOneToken(
+ const nsAString& aString, bool& aSuccess) {
+ nsWhitespaceTokenizerTemplate<nsContentUtils::IsHTMLWhitespace> tokenizer(
+ aString);
+
+ aSuccess = false;
+ if (!tokenizer.hasMoreTokens()) {
+ return {};
+ }
+ auto token = tokenizer.nextToken();
+ if (tokenizer.hasMoreTokens()) {
+ return {};
+ }
+
+ aSuccess = true;
+ return token;
+}
+
+} // namespace mozilla