Helper for checking if an SVGTextFragment is transformed

third_party/WebKit/Source/core/layout/svg/SVGTextQuery.cpp

 /*
  * Copyright (C) Research In Motion Limited 2010-2012. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 313 matching lines @@
         glyphPosition.move(0, glyphOffsetInDirection);
     else
         glyphPosition.move(glyphOffsetInDirection, 0);
 
     return glyphPosition;
 }
 
 static FloatPoint calculateGlyphPosition(const QueryData* queryData, const SVGTextFragment& fragment, int offsetInFragment)
 {
     FloatPoint glyphPosition = calculateGlyphPositionWithoutTransform(queryData, fragment, offsetInFragment);
-    AffineTransform fragmentTransform;
-    fragment.buildFragmentTransform(fragmentTransform, SVGTextFragment::TransformIgnoringTextLength);
-    if (!fragmentTransform.isIdentity())
+    if (fragment.isTransformed()) {
+        AffineTransform fragmentTransform;
+        fragment.buildFragmentTransform(fragmentTransform, SVGTextFragment::TransformIgnoringTextLength);
         glyphPosition = fragmentTransform.mapPoint(glyphPosition);
-
+    }
     return glyphPosition;
 }
 
 static bool startPositionOfCharacterCallback(QueryData* queryData, const SVGTextFragment& fragment)
 {
     StartPositionOfCharacterData* data = static_cast<StartPositionOfCharacterData*>(queryData);
 
     int startPosition = data->position;
     int endPosition = startPosition + 1;
     if (!mapStartEndPositionsIntoFragmentCoordinates(queryData, fragment, startPosition, endPosition))
@@ skipping 58 matching lines @@
 
 static bool rotationOfCharacterCallback(QueryData* queryData, const SVGTextFragment& fragment)
 {
     RotationOfCharacterData* data = static_cast<RotationOfCharacterData*>(queryData);
 
     int startPosition = data->position;
     int endPosition = startPosition + 1;
     if (!mapStartEndPositionsIntoFragmentCoordinates(queryData, fragment, startPosition, endPosition))
         return false;
 
-    AffineTransform fragmentTransform;
-    fragment.buildFragmentTransform(fragmentTransform, SVGTextFragment::TransformIgnoringTextLength);
-    if (fragmentTransform.isIdentity()) {
+    if (!fragment.isTransformed()) {
         data->rotation = 0;
     } else {
+        AffineTransform fragmentTransform;
+        fragment.buildFragmentTransform(fragmentTransform, SVGTextFragment::TransformIgnoringTextLength);
         fragmentTransform.scale(1 / fragmentTransform.xScale(), 1 / fragmentTransform.yScale());
         data->rotation = narrowPrecisionToFloat(rad2deg(atan2(fragmentTransform.b(), fragmentTransform.a())));
     }
 
     return true;
 }
 
 float SVGTextQuery::rotationOfCharacter(unsigned position) const
 {
     RotationOfCharacterData data(position);
@@ skipping 48 matching lines @@
     extent.setSize(glyphSize);
 
     // If RTL, adjust the starting point to align with the LHS of the glyph bounding box.
     if (!queryData->textBox->isLeftToRightDirection()) {
         if (queryData->isVerticalText)
             extent.move(0, -glyphSize.height());
         else
             extent.move(-glyphSize.width(), 0);
     }
 
-    AffineTransform fragmentTransform;
-    fragment.buildFragmentTransform(fragmentTransform, SVGTextFragment::TransformIgnoringTextLength);
-
-    extent = fragmentTransform.mapRect(extent);
+    if (fragment.isTransformed()) {
+        AffineTransform fragmentTransform;
+        fragment.buildFragmentTransform(fragmentTransform, SVGTextFragment::TransformIgnoringTextLength);
+        extent = fragmentTransform.mapRect(extent);
+    }
 }
 
 static inline FloatRect calculateFragmentBoundaries(LineLayoutSVGInlineText textLineLayout, const SVGTextFragment& fragment)
 {
     float scalingFactor = textLineLayout.scalingFactor();
     ASSERT(scalingFactor);
     float baseline = textLineLayout.scaledFont().fontMetrics().floatAscent() / scalingFactor;
 
     AffineTransform fragmentTransform;
     FloatRect fragmentRect(fragment.x, fragment.y - baseline, fragment.width, fragment.height);
@@ skipping 105 matching lines @@
 }
 
 int SVGTextQuery::characterNumberAtPosition(const FloatPoint& position) const
 {
     CharacterNumberAtPositionData data(position);
     spatialQuery(m_queryRootLayoutObject, &data, characterNumberAtPositionCallback);
     return data.characterNumberWithin(m_queryRootLayoutObject);
 }
 
 }