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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /dom/svg/SVGPathData.cpp
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'dom/svg/SVGPathData.cpp')
-rw-r--r--dom/svg/SVGPathData.cpp872
1 files changed, 872 insertions, 0 deletions
diff --git a/dom/svg/SVGPathData.cpp b/dom/svg/SVGPathData.cpp
new file mode 100644
index 000000000..2020798b4
--- /dev/null
+++ b/dom/svg/SVGPathData.cpp
@@ -0,0 +1,872 @@
+/* -*- 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/. */
+
+#include "SVGPathData.h"
+
+#include "gfx2DGlue.h"
+#include "gfxPlatform.h"
+#include "mozilla/gfx/2D.h"
+#include "mozilla/gfx/Types.h"
+#include "mozilla/gfx/Point.h"
+#include "mozilla/RefPtr.h"
+#include "nsError.h"
+#include "nsString.h"
+#include "nsSVGPathDataParser.h"
+#include "nsSVGPathGeometryElement.h" // for nsSVGMark
+#include <stdarg.h>
+#include "nsStyleConsts.h"
+#include "SVGContentUtils.h"
+#include "SVGPathSegUtils.h"
+#include <algorithm>
+
+using namespace mozilla;
+using namespace mozilla::gfx;
+
+static bool IsMoveto(uint16_t aSegType)
+{
+ return aSegType == PATHSEG_MOVETO_ABS ||
+ aSegType == PATHSEG_MOVETO_REL;
+}
+
+nsresult
+SVGPathData::CopyFrom(const SVGPathData& rhs)
+{
+ if (!mData.Assign(rhs.mData, fallible)) {
+ return NS_ERROR_OUT_OF_MEMORY;
+ }
+ return NS_OK;
+}
+
+void
+SVGPathData::GetValueAsString(nsAString& aValue) const
+{
+ // we need this function in DidChangePathSegList
+ aValue.Truncate();
+ if (!Length()) {
+ return;
+ }
+ uint32_t i = 0;
+ for (;;) {
+ nsAutoString segAsString;
+ SVGPathSegUtils::GetValueAsString(&mData[i], segAsString);
+ // We ignore OOM, since it's not useful for us to return an error.
+ aValue.Append(segAsString);
+ i += 1 + SVGPathSegUtils::ArgCountForType(mData[i]);
+ if (i >= mData.Length()) {
+ MOZ_ASSERT(i == mData.Length(), "Very, very bad - mData corrupt");
+ return;
+ }
+ aValue.Append(' ');
+ }
+}
+
+nsresult
+SVGPathData::SetValueFromString(const nsAString& aValue)
+{
+ // We don't use a temp variable since the spec says to parse everything up to
+ // the first error. We still return any error though so that callers know if
+ // there's a problem.
+
+ nsSVGPathDataParser pathParser(aValue, this);
+ return pathParser.Parse() ? NS_OK : NS_ERROR_DOM_SYNTAX_ERR;
+}
+
+nsresult
+SVGPathData::AppendSeg(uint32_t aType, ...)
+{
+ uint32_t oldLength = mData.Length();
+ uint32_t newLength = oldLength + 1 + SVGPathSegUtils::ArgCountForType(aType);
+ if (!mData.SetLength(newLength, fallible)) {
+ return NS_ERROR_OUT_OF_MEMORY;
+ }
+
+ mData[oldLength] = SVGPathSegUtils::EncodeType(aType);
+ va_list args;
+ va_start(args, aType);
+ for (uint32_t i = oldLength + 1; i < newLength; ++i) {
+ // NOTE! 'float' is promoted to 'double' when passed through '...'!
+ mData[i] = float(va_arg(args, double));
+ }
+ va_end(args);
+ return NS_OK;
+}
+
+float
+SVGPathData::GetPathLength() const
+{
+ SVGPathTraversalState state;
+
+ uint32_t i = 0;
+ while (i < mData.Length()) {
+ SVGPathSegUtils::TraversePathSegment(&mData[i], state);
+ i += 1 + SVGPathSegUtils::ArgCountForType(mData[i]);
+ }
+
+ MOZ_ASSERT(i == mData.Length(), "Very, very bad - mData corrupt");
+
+ return state.length;
+}
+
+#ifdef DEBUG
+uint32_t
+SVGPathData::CountItems() const
+{
+ uint32_t i = 0, count = 0;
+
+ while (i < mData.Length()) {
+ i += 1 + SVGPathSegUtils::ArgCountForType(mData[i]);
+ count++;
+ }
+
+ MOZ_ASSERT(i == mData.Length(), "Very, very bad - mData corrupt");
+
+ return count;
+}
+#endif
+
+bool
+SVGPathData::GetSegmentLengths(nsTArray<double> *aLengths) const
+{
+ aLengths->Clear();
+ SVGPathTraversalState state;
+
+ uint32_t i = 0;
+ while (i < mData.Length()) {
+ state.length = 0.0;
+ SVGPathSegUtils::TraversePathSegment(&mData[i], state);
+ if (!aLengths->AppendElement(state.length)) {
+ aLengths->Clear();
+ return false;
+ }
+ i += 1 + SVGPathSegUtils::ArgCountForType(mData[i]);
+ }
+
+ MOZ_ASSERT(i == mData.Length(), "Very, very bad - mData corrupt");
+
+ return true;
+}
+
+bool
+SVGPathData::GetDistancesFromOriginToEndsOfVisibleSegments(FallibleTArray<double> *aOutput) const
+{
+ SVGPathTraversalState state;
+
+ aOutput->Clear();
+
+ uint32_t i = 0;
+ while (i < mData.Length()) {
+ uint32_t segType = SVGPathSegUtils::DecodeType(mData[i]);
+ SVGPathSegUtils::TraversePathSegment(&mData[i], state);
+
+ // We skip all moveto commands except an initial moveto. See the text 'A
+ // "move to" command does not count as an additional point when dividing up
+ // the duration...':
+ //
+ // http://www.w3.org/TR/SVG11/animate.html#AnimateMotionElement
+ //
+ // This is important in the non-default case of calcMode="linear". In
+ // this case an equal amount of time is spent on each path segment,
+ // except on moveto segments which are jumped over immediately.
+
+ if (i == 0 || (segType != PATHSEG_MOVETO_ABS &&
+ segType != PATHSEG_MOVETO_REL)) {
+ if (!aOutput->AppendElement(state.length, fallible)) {
+ return false;
+ }
+ }
+ i += 1 + SVGPathSegUtils::ArgCountForType(segType);
+ }
+
+ MOZ_ASSERT(i == mData.Length(), "Very, very bad - mData corrupt?");
+
+ return true;
+}
+
+uint32_t
+SVGPathData::GetPathSegAtLength(float aDistance) const
+{
+ // TODO [SVGWG issue] get specified what happen if 'aDistance' < 0, or
+ // 'aDistance' > the length of the path, or the seg list is empty.
+ // Return -1? Throwing would better help authors avoid tricky bugs (DOM
+ // could do that if we return -1).
+
+ uint32_t i = 0, segIndex = 0;
+ SVGPathTraversalState state;
+
+ while (i < mData.Length()) {
+ SVGPathSegUtils::TraversePathSegment(&mData[i], state);
+ if (state.length >= aDistance) {
+ return segIndex;
+ }
+ i += 1 + SVGPathSegUtils::ArgCountForType(mData[i]);
+ segIndex++;
+ }
+
+ MOZ_ASSERT(i == mData.Length(), "Very, very bad - mData corrupt");
+
+ return std::max(0U, segIndex - 1); // -1 because while loop takes us 1 too far
+}
+
+/**
+ * The SVG spec says we have to paint stroke caps for zero length subpaths:
+ *
+ * http://www.w3.org/TR/SVG11/implnote.html#PathElementImplementationNotes
+ *
+ * Cairo only does this for |stroke-linecap: round| and not for
+ * |stroke-linecap: square| (since that's what Adobe Acrobat has always done).
+ * Most likely the other backends that DrawTarget uses have the same behavior.
+ *
+ * To help us conform to the SVG spec we have this helper function to draw an
+ * approximation of square caps for zero length subpaths. It does this by
+ * inserting a subpath containing a single user space axis aligned straight
+ * line that is as small as it can be while minimizing the risk of it being
+ * thrown away by the DrawTarget's backend for being too small to affect
+ * rendering. The idea is that we'll then get stroke caps drawn for this axis
+ * aligned line, creating an axis aligned rectangle that approximates the
+ * square that would ideally be drawn.
+ *
+ * Since we don't have any information about transforms from user space to
+ * device space, we choose the length of the small line that we insert by
+ * making it a small percentage of the stroke width of the path. This should
+ * hopefully allow us to make the line as long as possible (to avoid rounding
+ * issues in the backend resulting in the backend seeing it as having zero
+ * length) while still avoiding the small rectangle being noticably different
+ * from a square.
+ *
+ * Note that this function inserts a subpath into the current gfx path that
+ * will be present during both fill and stroke operations.
+ */
+static void
+ApproximateZeroLengthSubpathSquareCaps(PathBuilder* aPB,
+ const Point& aPoint,
+ Float aStrokeWidth)
+{
+ // Note that caps are proportional to stroke width, so if stroke width is
+ // zero it's actually fine for |tinyLength| below to end up being zero.
+ // However, it would be a waste to inserting a LineTo in that case, so better
+ // not to.
+ MOZ_ASSERT(aStrokeWidth > 0.0f,
+ "Make the caller check for this, or check it here");
+
+ // The fraction of the stroke width that we choose for the length of the
+ // line is rather arbitrary, other than being chosen to meet the requirements
+ // described in the comment above.
+
+ Float tinyLength = aStrokeWidth / SVG_ZERO_LENGTH_PATH_FIX_FACTOR;
+
+ aPB->LineTo(aPoint + Point(tinyLength, 0));
+ aPB->MoveTo(aPoint);
+}
+
+#define MAYBE_APPROXIMATE_ZERO_LENGTH_SUBPATH_SQUARE_CAPS_TO_DT \
+ do { \
+ if (!subpathHasLength && hasLineCaps && aStrokeWidth > 0 && \
+ subpathContainsNonMoveTo && \
+ SVGPathSegUtils::IsValidType(prevSegType) && \
+ (!IsMoveto(prevSegType) || segType == PATHSEG_CLOSEPATH)) { \
+ ApproximateZeroLengthSubpathSquareCaps(builder, segStart, aStrokeWidth);\
+ } \
+ } while(0)
+
+already_AddRefed<Path>
+SVGPathData::BuildPath(PathBuilder* builder,
+ uint8_t aStrokeLineCap,
+ Float aStrokeWidth) const
+{
+ if (mData.IsEmpty() || !IsMoveto(SVGPathSegUtils::DecodeType(mData[0]))) {
+ return nullptr; // paths without an initial moveto are invalid
+ }
+
+ bool hasLineCaps = aStrokeLineCap != NS_STYLE_STROKE_LINECAP_BUTT;
+ bool subpathHasLength = false; // visual length
+ bool subpathContainsNonMoveTo = false;
+
+ uint32_t segType = PATHSEG_UNKNOWN;
+ uint32_t prevSegType = PATHSEG_UNKNOWN;
+ Point pathStart(0.0, 0.0); // start point of [sub]path
+ Point segStart(0.0, 0.0);
+ Point segEnd;
+ Point cp1, cp2; // previous bezier's control points
+ Point tcp1, tcp2; // temporaries
+
+ // Regarding cp1 and cp2: If the previous segment was a cubic bezier curve,
+ // then cp2 is its second control point. If the previous segment was a
+ // quadratic curve, then cp1 is its (only) control point.
+
+ uint32_t i = 0;
+ while (i < mData.Length()) {
+ segType = SVGPathSegUtils::DecodeType(mData[i++]);
+ uint32_t argCount = SVGPathSegUtils::ArgCountForType(segType);
+
+ switch (segType)
+ {
+ case PATHSEG_CLOSEPATH:
+ // set this early to allow drawing of square caps for "M{x},{y} Z":
+ subpathContainsNonMoveTo = true;
+ MAYBE_APPROXIMATE_ZERO_LENGTH_SUBPATH_SQUARE_CAPS_TO_DT;
+ segEnd = pathStart;
+ builder->Close();
+ break;
+
+ case PATHSEG_MOVETO_ABS:
+ MAYBE_APPROXIMATE_ZERO_LENGTH_SUBPATH_SQUARE_CAPS_TO_DT;
+ pathStart = segEnd = Point(mData[i], mData[i+1]);
+ builder->MoveTo(segEnd);
+ subpathHasLength = false;
+ break;
+
+ case PATHSEG_MOVETO_REL:
+ MAYBE_APPROXIMATE_ZERO_LENGTH_SUBPATH_SQUARE_CAPS_TO_DT;
+ pathStart = segEnd = segStart + Point(mData[i], mData[i+1]);
+ builder->MoveTo(segEnd);
+ subpathHasLength = false;
+ break;
+
+ case PATHSEG_LINETO_ABS:
+ segEnd = Point(mData[i], mData[i+1]);
+ if (segEnd != segStart) {
+ subpathHasLength = true;
+ builder->LineTo(segEnd);
+ }
+ break;
+
+ case PATHSEG_LINETO_REL:
+ segEnd = segStart + Point(mData[i], mData[i+1]);
+ if (segEnd != segStart) {
+ subpathHasLength = true;
+ builder->LineTo(segEnd);
+ }
+ break;
+
+ case PATHSEG_CURVETO_CUBIC_ABS:
+ cp1 = Point(mData[i], mData[i+1]);
+ cp2 = Point(mData[i+2], mData[i+3]);
+ segEnd = Point(mData[i+4], mData[i+5]);
+ if (segEnd != segStart || segEnd != cp1 || segEnd != cp2) {
+ subpathHasLength = true;
+ builder->BezierTo(cp1, cp2, segEnd);
+ }
+ break;
+
+ case PATHSEG_CURVETO_CUBIC_REL:
+ cp1 = segStart + Point(mData[i], mData[i+1]);
+ cp2 = segStart + Point(mData[i+2], mData[i+3]);
+ segEnd = segStart + Point(mData[i+4], mData[i+5]);
+ if (segEnd != segStart || segEnd != cp1 || segEnd != cp2) {
+ subpathHasLength = true;
+ builder->BezierTo(cp1, cp2, segEnd);
+ }
+ break;
+
+ case PATHSEG_CURVETO_QUADRATIC_ABS:
+ cp1 = Point(mData[i], mData[i+1]);
+ // Convert quadratic curve to cubic curve:
+ tcp1 = segStart + (cp1 - segStart) * 2 / 3;
+ segEnd = Point(mData[i+2], mData[i+3]); // set before setting tcp2!
+ tcp2 = cp1 + (segEnd - cp1) / 3;
+ if (segEnd != segStart || segEnd != cp1) {
+ subpathHasLength = true;
+ builder->BezierTo(tcp1, tcp2, segEnd);
+ }
+ break;
+
+ case PATHSEG_CURVETO_QUADRATIC_REL:
+ cp1 = segStart + Point(mData[i], mData[i+1]);
+ // Convert quadratic curve to cubic curve:
+ tcp1 = segStart + (cp1 - segStart) * 2 / 3;
+ segEnd = segStart + Point(mData[i+2], mData[i+3]); // set before setting tcp2!
+ tcp2 = cp1 + (segEnd - cp1) / 3;
+ if (segEnd != segStart || segEnd != cp1) {
+ subpathHasLength = true;
+ builder->BezierTo(tcp1, tcp2, segEnd);
+ }
+ break;
+
+ case PATHSEG_ARC_ABS:
+ case PATHSEG_ARC_REL:
+ {
+ Point radii(mData[i], mData[i+1]);
+ segEnd = Point(mData[i+5], mData[i+6]);
+ if (segType == PATHSEG_ARC_REL) {
+ segEnd += segStart;
+ }
+ if (segEnd != segStart) {
+ subpathHasLength = true;
+ if (radii.x == 0.0f || radii.y == 0.0f) {
+ builder->LineTo(segEnd);
+ } else {
+ nsSVGArcConverter converter(segStart, segEnd, radii, mData[i+2],
+ mData[i+3] != 0, mData[i+4] != 0);
+ while (converter.GetNextSegment(&cp1, &cp2, &segEnd)) {
+ builder->BezierTo(cp1, cp2, segEnd);
+ }
+ }
+ }
+ break;
+ }
+
+ case PATHSEG_LINETO_HORIZONTAL_ABS:
+ segEnd = Point(mData[i], segStart.y);
+ if (segEnd != segStart) {
+ subpathHasLength = true;
+ builder->LineTo(segEnd);
+ }
+ break;
+
+ case PATHSEG_LINETO_HORIZONTAL_REL:
+ segEnd = segStart + Point(mData[i], 0.0f);
+ if (segEnd != segStart) {
+ subpathHasLength = true;
+ builder->LineTo(segEnd);
+ }
+ break;
+
+ case PATHSEG_LINETO_VERTICAL_ABS:
+ segEnd = Point(segStart.x, mData[i]);
+ if (segEnd != segStart) {
+ subpathHasLength = true;
+ builder->LineTo(segEnd);
+ }
+ break;
+
+ case PATHSEG_LINETO_VERTICAL_REL:
+ segEnd = segStart + Point(0.0f, mData[i]);
+ if (segEnd != segStart) {
+ subpathHasLength = true;
+ builder->LineTo(segEnd);
+ }
+ break;
+
+ case PATHSEG_CURVETO_CUBIC_SMOOTH_ABS:
+ cp1 = SVGPathSegUtils::IsCubicType(prevSegType) ? segStart * 2 - cp2 : segStart;
+ cp2 = Point(mData[i], mData[i+1]);
+ segEnd = Point(mData[i+2], mData[i+3]);
+ if (segEnd != segStart || segEnd != cp1 || segEnd != cp2) {
+ subpathHasLength = true;
+ builder->BezierTo(cp1, cp2, segEnd);
+ }
+ break;
+
+ case PATHSEG_CURVETO_CUBIC_SMOOTH_REL:
+ cp1 = SVGPathSegUtils::IsCubicType(prevSegType) ? segStart * 2 - cp2 : segStart;
+ cp2 = segStart + Point(mData[i], mData[i+1]);
+ segEnd = segStart + Point(mData[i+2], mData[i+3]);
+ if (segEnd != segStart || segEnd != cp1 || segEnd != cp2) {
+ subpathHasLength = true;
+ builder->BezierTo(cp1, cp2, segEnd);
+ }
+ break;
+
+ case PATHSEG_CURVETO_QUADRATIC_SMOOTH_ABS:
+ cp1 = SVGPathSegUtils::IsQuadraticType(prevSegType) ? segStart * 2 - cp1 : segStart;
+ // Convert quadratic curve to cubic curve:
+ tcp1 = segStart + (cp1 - segStart) * 2 / 3;
+ segEnd = Point(mData[i], mData[i+1]); // set before setting tcp2!
+ tcp2 = cp1 + (segEnd - cp1) / 3;
+ if (segEnd != segStart || segEnd != cp1) {
+ subpathHasLength = true;
+ builder->BezierTo(tcp1, tcp2, segEnd);
+ }
+ break;
+
+ case PATHSEG_CURVETO_QUADRATIC_SMOOTH_REL:
+ cp1 = SVGPathSegUtils::IsQuadraticType(prevSegType) ? segStart * 2 - cp1 : segStart;
+ // Convert quadratic curve to cubic curve:
+ tcp1 = segStart + (cp1 - segStart) * 2 / 3;
+ segEnd = segStart + Point(mData[i], mData[i+1]); // changed before setting tcp2!
+ tcp2 = cp1 + (segEnd - cp1) / 3;
+ if (segEnd != segStart || segEnd != cp1) {
+ subpathHasLength = true;
+ builder->BezierTo(tcp1, tcp2, segEnd);
+ }
+ break;
+
+ default:
+ NS_NOTREACHED("Bad path segment type");
+ return nullptr; // according to spec we'd use everything up to the bad seg anyway
+ }
+
+ subpathContainsNonMoveTo = segType != PATHSEG_MOVETO_ABS &&
+ segType != PATHSEG_MOVETO_REL;
+ i += argCount;
+ prevSegType = segType;
+ segStart = segEnd;
+ }
+
+ MOZ_ASSERT(i == mData.Length(), "Very, very bad - mData corrupt");
+ MOZ_ASSERT(prevSegType == segType,
+ "prevSegType should be left at the final segType");
+
+ MAYBE_APPROXIMATE_ZERO_LENGTH_SUBPATH_SQUARE_CAPS_TO_DT;
+
+ return builder->Finish();
+}
+
+already_AddRefed<Path>
+SVGPathData::BuildPathForMeasuring() const
+{
+ // Since the path that we return will not be used for painting it doesn't
+ // matter what we pass to CreatePathBuilder as aFillRule. Hawever, we do want
+ // to pass something other than NS_STYLE_STROKE_LINECAP_SQUARE as
+ // aStrokeLineCap to avoid the insertion of extra little lines (by
+ // ApproximateZeroLengthSubpathSquareCaps), in which case the value that we
+ // pass as aStrokeWidth doesn't matter (since it's only used to determine the
+ // length of those extra little lines).
+
+ RefPtr<DrawTarget> drawTarget =
+ gfxPlatform::GetPlatform()->ScreenReferenceDrawTarget();
+ RefPtr<PathBuilder> builder =
+ drawTarget->CreatePathBuilder(FillRule::FILL_WINDING);
+ return BuildPath(builder, NS_STYLE_STROKE_LINECAP_BUTT, 0);
+}
+
+static double
+AngleOfVector(const Point& aVector)
+{
+ // C99 says about atan2 "A domain error may occur if both arguments are
+ // zero" and "On a domain error, the function returns an implementation-
+ // defined value". In the case of atan2 the implementation-defined value
+ // seems to commonly be zero, but it could just as easily be a NaN value.
+ // We specifically want zero in this case, hence the check:
+
+ return (aVector != Point(0.0, 0.0)) ? atan2(aVector.y, aVector.x) : 0.0;
+}
+
+static float
+AngleOfVector(const Point& cp1, const Point& cp2)
+{
+ return static_cast<float>(AngleOfVector(cp1 - cp2));
+}
+
+void
+SVGPathData::GetMarkerPositioningData(nsTArray<nsSVGMark> *aMarks) const
+{
+ // This code should assume that ANY type of segment can appear at ANY index.
+ // It should also assume that segments such as M and Z can appear in weird
+ // places, and repeat multiple times consecutively.
+
+ // info on current [sub]path (reset every M command):
+ Point pathStart(0.0, 0.0);
+ float pathStartAngle = 0.0f;
+
+ // info on previous segment:
+ uint16_t prevSegType = PATHSEG_UNKNOWN;
+ Point prevSegEnd(0.0, 0.0);
+ float prevSegEndAngle = 0.0f;
+ Point prevCP; // if prev seg was a bezier, this was its last control point
+
+ uint32_t i = 0;
+ while (i < mData.Length()) {
+
+ // info on current segment:
+ uint16_t segType =
+ SVGPathSegUtils::DecodeType(mData[i++]); // advances i to args
+ Point& segStart = prevSegEnd;
+ Point segEnd;
+ float segStartAngle, segEndAngle;
+
+ switch (segType) // to find segStartAngle, segEnd and segEndAngle
+ {
+ case PATHSEG_CLOSEPATH:
+ segEnd = pathStart;
+ segStartAngle = segEndAngle = AngleOfVector(segEnd, segStart);
+ break;
+
+ case PATHSEG_MOVETO_ABS:
+ case PATHSEG_MOVETO_REL:
+ if (segType == PATHSEG_MOVETO_ABS) {
+ segEnd = Point(mData[i], mData[i+1]);
+ } else {
+ segEnd = segStart + Point(mData[i], mData[i+1]);
+ }
+ pathStart = segEnd;
+ // If authors are going to specify multiple consecutive moveto commands
+ // with markers, me might as well make the angle do something useful:
+ segStartAngle = segEndAngle = AngleOfVector(segEnd, segStart);
+ i += 2;
+ break;
+
+ case PATHSEG_LINETO_ABS:
+ case PATHSEG_LINETO_REL:
+ if (segType == PATHSEG_LINETO_ABS) {
+ segEnd = Point(mData[i], mData[i+1]);
+ } else {
+ segEnd = segStart + Point(mData[i], mData[i+1]);
+ }
+ segStartAngle = segEndAngle = AngleOfVector(segEnd, segStart);
+ i += 2;
+ break;
+
+ case PATHSEG_CURVETO_CUBIC_ABS:
+ case PATHSEG_CURVETO_CUBIC_REL:
+ {
+ Point cp1, cp2; // control points
+ if (segType == PATHSEG_CURVETO_CUBIC_ABS) {
+ cp1 = Point(mData[i], mData[i+1]);
+ cp2 = Point(mData[i+2], mData[i+3]);
+ segEnd = Point(mData[i+4], mData[i+5]);
+ } else {
+ cp1 = segStart + Point(mData[i], mData[i+1]);
+ cp2 = segStart + Point(mData[i+2], mData[i+3]);
+ segEnd = segStart + Point(mData[i+4], mData[i+5]);
+ }
+ prevCP = cp2;
+ segStartAngle =
+ AngleOfVector(cp1 == segStart ? (cp1 == cp2 ? segEnd : cp2) : cp1, segStart);
+ segEndAngle =
+ AngleOfVector(segEnd, cp2 == segEnd ? (cp1 == cp2 ? segStart : cp1) : cp2);
+ i += 6;
+ break;
+ }
+
+ case PATHSEG_CURVETO_QUADRATIC_ABS:
+ case PATHSEG_CURVETO_QUADRATIC_REL:
+ {
+ Point cp1; // control point
+ if (segType == PATHSEG_CURVETO_QUADRATIC_ABS) {
+ cp1 = Point(mData[i], mData[i+1]);
+ segEnd = Point(mData[i+2], mData[i+3]);
+ } else {
+ cp1 = segStart + Point(mData[i], mData[i+1]);
+ segEnd = segStart + Point(mData[i+2], mData[i+3]);
+ }
+ prevCP = cp1;
+ segStartAngle = AngleOfVector(cp1 == segStart ? segEnd : cp1, segStart);
+ segEndAngle = AngleOfVector(segEnd, cp1 == segEnd ? segStart : cp1);
+ i += 4;
+ break;
+ }
+
+ case PATHSEG_ARC_ABS:
+ case PATHSEG_ARC_REL:
+ {
+ double rx = mData[i];
+ double ry = mData[i+1];
+ double angle = mData[i+2];
+ bool largeArcFlag = mData[i+3] != 0.0f;
+ bool sweepFlag = mData[i+4] != 0.0f;
+ if (segType == PATHSEG_ARC_ABS) {
+ segEnd = Point(mData[i+5], mData[i+6]);
+ } else {
+ segEnd = segStart + Point(mData[i+5], mData[i+6]);
+ }
+
+ // See section F.6 of SVG 1.1 for details on what we're doing here:
+ // http://www.w3.org/TR/SVG11/implnote.html#ArcImplementationNotes
+
+ if (segStart == segEnd) {
+ // F.6.2 says "If the endpoints (x1, y1) and (x2, y2) are identical,
+ // then this is equivalent to omitting the elliptical arc segment
+ // entirely." We take that very literally here, not adding a mark, and
+ // not even setting any of the 'prev' variables so that it's as if this
+ // arc had never existed; note the difference this will make e.g. if
+ // the arc is proceeded by a bezier curve and followed by a "smooth"
+ // bezier curve of the same degree!
+ i += 7;
+ continue;
+ }
+
+ // Below we have funny interleaving of F.6.6 (Correction of out-of-range
+ // radii) and F.6.5 (Conversion from endpoint to center parameterization)
+ // which is designed to avoid some unnecessary calculations.
+
+ if (rx == 0.0 || ry == 0.0) {
+ // F.6.6 step 1 - straight line or coincidental points
+ segStartAngle = segEndAngle = AngleOfVector(segEnd, segStart);
+ i += 7;
+ break;
+ }
+ rx = fabs(rx); // F.6.6.1
+ ry = fabs(ry);
+
+ // F.6.5.1:
+ angle = angle * M_PI/180.0;
+ double x1p = cos(angle) * (segStart.x - segEnd.x) / 2.0
+ + sin(angle) * (segStart.y - segEnd.y) / 2.0;
+ double y1p = -sin(angle) * (segStart.x - segEnd.x) / 2.0
+ + cos(angle) * (segStart.y - segEnd.y) / 2.0;
+
+ // This is the root in F.6.5.2 and the numerator under that root:
+ double root;
+ double numerator = rx*rx*ry*ry - rx*rx*y1p*y1p - ry*ry*x1p*x1p;
+
+ if (numerator >= 0.0) {
+ root = sqrt(numerator/(rx*rx*y1p*y1p + ry*ry*x1p*x1p));
+ if (largeArcFlag == sweepFlag)
+ root = -root;
+ } else {
+ // F.6.6 step 3 - |numerator < 0.0|. This is equivalent to the result
+ // of F.6.6.2 (lamedh) being greater than one. What we have here is
+ // ellipse radii that are too small for the ellipse to reach between
+ // segStart and segEnd. We scale the radii up uniformly so that the
+ // ellipse is just big enough to fit (i.e. to the point where there is
+ // exactly one solution).
+
+ double lamedh = 1.0 - numerator/(rx*rx*ry*ry); // equiv to eqn F.6.6.2
+ double s = sqrt(lamedh);
+ rx *= s; // F.6.6.3
+ ry *= s;
+ root = 0.0;
+ }
+
+ double cxp = root * rx * y1p / ry; // F.6.5.2
+ double cyp = -root * ry * x1p / rx;
+
+ double theta, delta;
+ theta = AngleOfVector(Point((x1p-cxp)/rx, (y1p-cyp)/ry)); // F.6.5.5
+ delta = AngleOfVector(Point((-x1p-cxp)/rx, (-y1p-cyp)/ry)) - // F.6.5.6
+ theta;
+ if (!sweepFlag && delta > 0)
+ delta -= 2.0 * M_PI;
+ else if (sweepFlag && delta < 0)
+ delta += 2.0 * M_PI;
+
+ double tx1, ty1, tx2, ty2;
+ tx1 = -cos(angle)*rx*sin(theta) - sin(angle)*ry*cos(theta);
+ ty1 = -sin(angle)*rx*sin(theta) + cos(angle)*ry*cos(theta);
+ tx2 = -cos(angle)*rx*sin(theta+delta) - sin(angle)*ry*cos(theta+delta);
+ ty2 = -sin(angle)*rx*sin(theta+delta) + cos(angle)*ry*cos(theta+delta);
+
+ if (delta < 0.0f) {
+ tx1 = -tx1;
+ ty1 = -ty1;
+ tx2 = -tx2;
+ ty2 = -ty2;
+ }
+
+ segStartAngle = static_cast<float>(atan2(ty1, tx1));
+ segEndAngle = static_cast<float>(atan2(ty2, tx2));
+ i += 7;
+ break;
+ }
+
+ case PATHSEG_LINETO_HORIZONTAL_ABS:
+ case PATHSEG_LINETO_HORIZONTAL_REL:
+ if (segType == PATHSEG_LINETO_HORIZONTAL_ABS) {
+ segEnd = Point(mData[i++], segStart.y);
+ } else {
+ segEnd = segStart + Point(mData[i++], 0.0f);
+ }
+ segStartAngle = segEndAngle = AngleOfVector(segEnd, segStart);
+ break;
+
+ case PATHSEG_LINETO_VERTICAL_ABS:
+ case PATHSEG_LINETO_VERTICAL_REL:
+ if (segType == PATHSEG_LINETO_VERTICAL_ABS) {
+ segEnd = Point(segStart.x, mData[i++]);
+ } else {
+ segEnd = segStart + Point(0.0f, mData[i++]);
+ }
+ segStartAngle = segEndAngle = AngleOfVector(segEnd, segStart);
+ break;
+
+ case PATHSEG_CURVETO_CUBIC_SMOOTH_ABS:
+ case PATHSEG_CURVETO_CUBIC_SMOOTH_REL:
+ {
+ Point cp1 = SVGPathSegUtils::IsCubicType(prevSegType) ?
+ segStart * 2 - prevCP : segStart;
+ Point cp2;
+ if (segType == PATHSEG_CURVETO_CUBIC_SMOOTH_ABS) {
+ cp2 = Point(mData[i], mData[i+1]);
+ segEnd = Point(mData[i+2], mData[i+3]);
+ } else {
+ cp2 = segStart + Point(mData[i], mData[i+1]);
+ segEnd = segStart + Point(mData[i+2], mData[i+3]);
+ }
+ prevCP = cp2;
+ segStartAngle =
+ AngleOfVector(cp1 == segStart ? (cp1 == cp2 ? segEnd : cp2) : cp1, segStart);
+ segEndAngle =
+ AngleOfVector(segEnd, cp2 == segEnd ? (cp1 == cp2 ? segStart : cp1) : cp2);
+ i += 4;
+ break;
+ }
+
+ case PATHSEG_CURVETO_QUADRATIC_SMOOTH_ABS:
+ case PATHSEG_CURVETO_QUADRATIC_SMOOTH_REL:
+ {
+ Point cp1 = SVGPathSegUtils::IsQuadraticType(prevSegType) ?
+ segStart * 2 - prevCP : segStart;
+ if (segType == PATHSEG_CURVETO_QUADRATIC_SMOOTH_ABS) {
+ segEnd = Point(mData[i], mData[i+1]);
+ } else {
+ segEnd = segStart + Point(mData[i], mData[i+1]);
+ }
+ prevCP = cp1;
+ segStartAngle = AngleOfVector(cp1 == segStart ? segEnd : cp1, segStart);
+ segEndAngle = AngleOfVector(segEnd, cp1 == segEnd ? segStart : cp1);
+ i += 2;
+ break;
+ }
+
+ default:
+ // Leave any existing marks in aMarks so we have a visual indication of
+ // when things went wrong.
+ MOZ_ASSERT(false, "Unknown segment type - path corruption?");
+ return;
+ }
+
+ // Set the angle of the mark at the start of this segment:
+ if (aMarks->Length()) {
+ nsSVGMark &mark = aMarks->LastElement();
+ if (!IsMoveto(segType) && IsMoveto(prevSegType)) {
+ // start of new subpath
+ pathStartAngle = mark.angle = segStartAngle;
+ } else if (IsMoveto(segType) && !IsMoveto(prevSegType)) {
+ // end of a subpath
+ if (prevSegType != PATHSEG_CLOSEPATH)
+ mark.angle = prevSegEndAngle;
+ } else {
+ if (!(segType == PATHSEG_CLOSEPATH &&
+ prevSegType == PATHSEG_CLOSEPATH))
+ mark.angle = SVGContentUtils::AngleBisect(prevSegEndAngle, segStartAngle);
+ }
+ }
+
+ // Add the mark at the end of this segment, and set its position:
+ if (!aMarks->AppendElement(nsSVGMark(static_cast<float>(segEnd.x),
+ static_cast<float>(segEnd.y),
+ 0.0f,
+ nsSVGMark::eMid))) {
+ aMarks->Clear(); // OOM, so try to free some
+ return;
+ }
+
+ if (segType == PATHSEG_CLOSEPATH &&
+ prevSegType != PATHSEG_CLOSEPATH) {
+ aMarks->LastElement().angle =
+ //aMarks->ElementAt(pathStartIndex).angle =
+ SVGContentUtils::AngleBisect(segEndAngle, pathStartAngle);
+ }
+
+ prevSegType = segType;
+ prevSegEnd = segEnd;
+ prevSegEndAngle = segEndAngle;
+ }
+
+ MOZ_ASSERT(i == mData.Length(), "Very, very bad - mData corrupt");
+
+ if (aMarks->Length()) {
+ if (prevSegType != PATHSEG_CLOSEPATH) {
+ aMarks->LastElement().angle = prevSegEndAngle;
+ }
+ aMarks->LastElement().type = nsSVGMark::eEnd;
+ aMarks->ElementAt(0).type = nsSVGMark::eStart;
+ }
+}
+
+size_t
+SVGPathData::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const
+{
+ return mData.ShallowSizeOfExcludingThis(aMallocSizeOf);
+}
+
+size_t
+SVGPathData::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const
+{
+ return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
+}
+