Bug 889235 - Make text-shadow work on SVG text. r=cam

layout/base/nsLayoutUtils.cpp

@@ -2599,7 +2599,7 @@ nsLayoutUtils::GetTextShadowRectsUnion(const nsRect& aTextAndDecorationsRect,
                                        uint32_t aFlags)
 {
   const nsStyleText* textStyle = aFrame->StyleText();
-  if (!textStyle->HasTextShadow(aFrame))
+  if (!textStyle->HasTextShadow())
     return aTextAndDecorationsRect;
 
   nsRect resultRect = aTextAndDecorationsRect;
@@ -3814,7 +3814,7 @@ nsLayoutUtils::PaintTextShadow(const nsIFrame* aFrame,
                                void* aCallbackData)
 {
   const nsStyleText* textStyle = aFrame->StyleText();
-  if (!textStyle->HasTextShadow(aFrame))
+  if (!textStyle->HasTextShadow())
     return;
 
   // Text shadow happens with the last value being painted at the back,

layout/generic/nsTextFrame.cpp

@@ -5211,9 +5211,6 @@ static bool GetSelectionTextShadow(nsIFrame* aFrame,
                                    nsTextPaintStyle& aTextPaintStyle,
                                    nsCSSShadowArray** aShadow)
 {
-  if (aFrame->IsSVGText()) {
-    return false;
-  }
   switch (aType) {
     case nsISelectionController::SELECTION_NORMAL:
       return aTextPaintStyle.GetSelectionShadow(aShadow);
@@ -5511,7 +5508,7 @@ nsTextFrame::PaintTextWithSelectionColors(gfxContext* aCtx,
 
     // Determine what shadow, if any, to draw - either from textStyle
     // or from the ::-moz-selection pseudo-class if specified there
-    nsCSSShadowArray *shadow = textStyle->GetTextShadow(this);
+    nsCSSShadowArray* shadow = textStyle->GetTextShadow();
     GetSelectionTextShadow(this, type, aTextPaintStyle, &shadow);
 
     // Draw shadows, if any
@@ -5897,7 +5894,7 @@ nsTextFrame::PaintText(nsRenderingContext* aRenderingContext, nsPoint aPt,
   nscolor foregroundColor = textPaintStyle.GetTextColor();
   if (!aCallbacks) {
     const nsStyleText* textStyle = StyleText();
-    if (textStyle->HasTextShadow(this)) {
+    if (textStyle->HasTextShadow()) {
       // Text shadow happens with the last value being painted at the back,
       // ie. it is painted first.
       gfxTextRun::Metrics shadowMetrics = 

layout/reftests/svg/text/dynamic-text-shadow.svg

@@ -0,0 +1,15 @@
+<!--
+     Any copyright is dedicated to the Public Domain.
+     http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<svg xmlns="http://www.w3.org/2000/svg" class="reftest-wait">
+  <text x="30" y="30" fill="green" style="text-shadow: #cc9900 20px 12px 2px">Hello</text>
+  <script>
+    function f() {
+      document.getElementsByTagName("text")[0].style.textShadow = "grey 3px 3px";
+      document.documentElement.removeAttribute("class");
+    }
+
+    window.addEventListener("MozReftestInvalidate", f, false);
+  </script>
+</svg>

layout/reftests/svg/text/ignore-text-shadow.svg

@@ -1,7 +0,0 @@
-<!--
-     Any copyright is dedicated to the Public Domain.
-     http://creativecommons.org/publicdomain/zero/1.0/
--->
-<svg xmlns="http://www.w3.org/2000/svg" width="700" height="200">
-  <text x="100" y="100" style="font: 16px sans-serif">hello <tspan style="text-shadow: 2px 2px 3px #000">there</tspan> everyone</text>
-</svg>

layout/reftests/svg/text/reftest.list

@@ -127,6 +127,9 @@ fuzzy-if(/^Windows\x20NT\x206\.[12]/.test(http.oscpu),4,15) == textLength-3.svg
 == textLength-5.svg textLength-5-ref.svg
 == textLength-6.svg textLength-6-ref.svg
 
+# text-shadow
+== text-shadow.svg text-shadow-ref.svg
+
 # tests for ignoring various properties
 == ignore-border.svg ignore-prop-ref.svg
 == ignore-display.svg ignore-display-ref.svg
@@ -135,7 +138,6 @@ fuzzy-if(/^Windows\x20NT\x206\.[12]/.test(http.oscpu),4,15) == textLength-3.svg
 == ignore-position.svg ignore-position-ref.svg
 == ignore-margin.svg ignore-prop-ref.svg
 == ignore-padding.svg ignore-prop-ref.svg
-== ignore-text-shadow.svg ignore-prop-ref.svg
 == ignore-vertical-align.svg ignore-vertical-align-ref.svg
 == ignore-overflow-scroll.svg ignore-prop-ref.svg
 == ignore-text-align.svg ignore-prop-ref.svg
@@ -163,6 +165,7 @@ fuzzy-if(/^Windows\x20NT\x206\.[12]/.test(http.oscpu),4,15) == textLength-3.svg
 == dynamic-dominant-baseline.svg dynamic-dominant-baseline-ref.svg
 == dynamic-multiple-x.svg dynamic-multiple-x-ref.svg
 fuzzy-if(!d2d,14,2) fuzzy-if(azureQuartz,1,6) == dynamic-non-scaling-stroke.svg dynamic-non-scaling-stroke-ref.svg #Bug 885316
+== dynamic-text-shadow.svg text-shadow-ref.svg
 
 # text and masks
 HTTP(../..) == mask-applied.svg mask-applied-ref.svg

layout/reftests/svg/text/text-shadow-ref.svg

@@ -0,0 +1,8 @@
+<!--
+     Any copyright is dedicated to the Public Domain.
+     http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<svg xmlns="http://www.w3.org/2000/svg">
+  <text x="33" y="33" fill="grey">Hello</text>
+  <text x="30" y="30" fill="green">Hello</text>
+</svg>

layout/reftests/svg/text/text-shadow.svg

@@ -0,0 +1,7 @@
+<!--
+     Any copyright is dedicated to the Public Domain.
+     http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<svg xmlns="http://www.w3.org/2000/svg">
+  <text x="30" y="30" fill="green" style="text-shadow: grey 3px 3px;">Hello</text>
+</svg>

layout/style/nsStyleStruct.h

@@ -1431,13 +1431,13 @@ struct nsStyleText {
   }
 
   // These are defined in nsStyleStructInlines.h.
+  inline bool HasTextShadow() const;
+  inline nsCSSShadowArray* GetTextShadow() const;
 
   // The aContextFrame argument on each of these is the frame this
   // style struct is for.  If the frame is for SVG text, the return
   // value will be massaged to be something that makes sense for
   // SVG text.
-  inline bool HasTextShadow(const nsIFrame* aContextFrame) const;
-  inline nsCSSShadowArray* GetTextShadow(const nsIFrame* aContextFrame) const;
   inline bool WhiteSpaceCanWrap(const nsIFrame* aContextFrame) const;
   inline bool WordCanWrap(const nsIFrame* aContextFrame) const;
 };

layout/style/nsStyleStructInlines.h

@@ -57,19 +57,14 @@ nsStyleBorder::GetSubImage(uint8_t aIndex) const
 }
 
 bool
-nsStyleText::HasTextShadow(const nsIFrame* aContextFrame) const
+nsStyleText::HasTextShadow() const
 {
-  NS_ASSERTION(aContextFrame->StyleText() == this, "unexpected aContextFrame");
-  return mTextShadow && !aContextFrame->IsSVGText();
+  return mTextShadow;
 }
 
 nsCSSShadowArray*
-nsStyleText::GetTextShadow(const nsIFrame* aContextFrame) const
+nsStyleText::GetTextShadow() const
 {
-  NS_ASSERTION(aContextFrame->StyleText() == this, "unexpected aContextFrame");
-  if (aContextFrame->IsSVGText()) {
-    return nullptr;
-  }
   return mTextShadow;
 }
 

layout/svg/SVGTextFrame.cpp

@@ -632,8 +632,10 @@ struct TextRenderedRun
     eIncludeFill = 1,
     // Includes the stroke geometry of the text in the returned rectangle.
     eIncludeStroke = 2,
+    // Includes any text shadow in the returned rectangle.
+    eIncludeTextShadow = 4,
     // Don't include any horizontal glyph overflow in the returned rectangle.
-    eNoHorizontalOverflow = 4
+    eNoHorizontalOverflow = 8
   };
 
   /**
@@ -910,11 +912,21 @@ TextRenderedRun::GetRunUserSpaceRect(nsPresContext* aContext,
     x = metrics.mBoundingBox.x;
     width = metrics.mBoundingBox.width;
   }
-  gfxRect fillInAppUnits(x, baseline - above,
-                         width, metrics.mBoundingBox.height + above + below);
+  nsRect fillInAppUnits(x, baseline - above,
+                        width, metrics.mBoundingBox.height + above + below);
+
+  // Account for text-shadow.
+  if (aFlags & eIncludeTextShadow) {
+    fillInAppUnits =
+      nsLayoutUtils::GetTextShadowRectsUnion(fillInAppUnits, mFrame);
+  }
 
   // Convert the app units rectangle to user units.
-  gfxRect fill = AppUnitsToFloatCSSPixels(fillInAppUnits, aContext);
+  gfxRect fill = AppUnitsToFloatCSSPixels(gfxRect(fillInAppUnits.x,
+                                                  fillInAppUnits.y,
+                                                  fillInAppUnits.width,
+                                                  fillInAppUnits.height),
+                                          aContext);
 
   // Scale the rectangle up due to any mFontSizeScaleFactor.  We scale
   // it around the text's origin.
@@ -3738,14 +3750,25 @@ SVGTextFrame::ReflowSVG()
   TextRenderedRunIterator it(this, TextRenderedRunIterator::eAllFrames);
   for (TextRenderedRun run = it.Current(); run.mFrame; run = it.Next()) {
     uint32_t runFlags = 0;
+    if (run.mFrame->StyleSVG()->mFill.mType != eStyleSVGPaintType_None) {
+      runFlags |= TextRenderedRun::eIncludeFill |
+                  TextRenderedRun::eIncludeTextShadow;
+    }
+    if (nsSVGUtils::HasStroke(run.mFrame)) {
+      runFlags |= TextRenderedRun::eIncludeFill |
+                  TextRenderedRun::eIncludeTextShadow;
+    }
+    // Our "visual" overflow rect needs to be valid for building display lists
+    // for hit testing, which means that for certain values of 'pointer-events'
+    // it needs to include the geometry of the fill or stroke even when the fill/
+    // stroke don't actually render (e.g. when stroke="none" or
+    // stroke-opacity="0"). GetGeometryHitTestFlags accounts for 'pointer-events'.
+    // The text-shadow is not part of the hit-test area.
     uint16_t hitTestFlags = nsSVGUtils::GetGeometryHitTestFlags(run.mFrame);
-
-    if ((hitTestFlags & SVG_HIT_TEST_FILL) ||
-        run.mFrame->StyleSVG()->mFill.mType != eStyleSVGPaintType_None) {
+    if (hitTestFlags & SVG_HIT_TEST_FILL) {
       runFlags |= TextRenderedRun::eIncludeFill;
     }
-    if ((hitTestFlags & SVG_HIT_TEST_STROKE) ||
-        nsSVGUtils::HasStroke(run.mFrame)) {
+    if (hitTestFlags & SVG_HIT_TEST_STROKE) {
       runFlags |= TextRenderedRun::eIncludeStroke;
     }