Speed-up id look-up for SVG node.

Since we are iterating all the XML attributes, we find and locate the id
while we are inside the loop. Thus, no need to retrieve the id via
QXmlStreamAttributes::value().

Also, get rid of someId(QSvgAttributes) function and use the 'id' member
variable directly.

Loading tiger.svg (tests/benchmarks/qsvgrenderer) enjoys 1.2% speed-up.

Reviewed-by: Kim

1 files changed, 16 insertions, 10 deletions

diff --git a/src/svg/qsvghandler.cpp b/src/svg/qsvghandler.cpp
index 38ffe3e4ad..1bfd260dbf 100644
--- a/src/svg/qsvghandler.cpp
+++ b/src/svg/qsvghandler.cpp
@@ -127,7 +127,6 @@ struct QSvgAttributes
 
 QSvgAttributes::QSvgAttributes(const QXmlStreamAttributes &xmlAttributes, QSvgHandler *handler)
 {
-    id = someId(xmlAttributes);
     QStringRef style = xmlAttributes.value(QLatin1String("style"));
     if (!style.isEmpty()) {
         handler->parseCSStoXMLAttrs(style.toString(), &m_cssAttributes);
@@ -268,6 +267,11 @@ QSvgAttributes::QSvgAttributes(const QXmlStreamAttributes &xmlAttributes, QSvgHa
                 fontVariant = value;
             break;
 
+        case 'i':
+            if (name == QLatin1String("id"))
+                id = value.toString();
+            break;
+
         case 'o':
             if (name == QLatin1String("opacity"))
                 opacity = value;
@@ -315,6 +319,11 @@ QSvgAttributes::QSvgAttributes(const QXmlStreamAttributes &xmlAttributes, QSvgHa
                 visibility = value;
             break;
 
+        case 'x':
+            if (name == QLatin1String("xml:id") && id.isEmpty())
+                id = value.toString();
+            break;
+
         default:
             break;
         }
@@ -322,9 +331,6 @@ QSvgAttributes::QSvgAttributes(const QXmlStreamAttributes &xmlAttributes, QSvgHa
 
 }
 
-static inline QString someId(const QSvgAttributes &attributes)
-{ return attributes.id; }
-
 static const char * QSvgStyleSelector_nodeString[] = {
     "svg",
     "g",
@@ -949,7 +955,7 @@ static void parseBrush(QSvgNode *node,
                 prop->setBrush(QBrush(Qt::NoBrush));
             }
         }
-        node->appendStyleProperty(prop, someId(attributes));
+        node->appendStyleProperty(prop, attributes.id);
     }
 }
 
@@ -1185,7 +1191,7 @@ static void parsePen(QSvgNode *node,
         if (!attributes.strokeOpacity.isEmpty() && attributes.strokeOpacity != QT_INHERIT)
             prop->setOpacity(qMin(qreal(1.0), qMax(qreal(0.0), toDouble(attributes.strokeOpacity))));
 
-        node->appendStyleProperty(prop, someId(attributes));
+        node->appendStyleProperty(prop, attributes.id);
     }
 }
 
@@ -1259,7 +1265,7 @@ static void parseFont(QSvgNode *node,
            fontStyle->setTextAnchor(Qt::AlignRight);
     }
 
-    node->appendStyleProperty(fontStyle, someId(attributes));
+    node->appendStyleProperty(fontStyle, attributes.id);
 }
 
 static void parseTransform(QSvgNode *node,
@@ -1271,7 +1277,7 @@ static void parseTransform(QSvgNode *node,
     QMatrix matrix = parseTransformationMatrix(trimRef(attributes.transform));
 
     if (!matrix.isIdentity()) {
-        node->appendStyleProperty(new QSvgTransformStyle(QTransform(matrix)), someId(attributes));
+        node->appendStyleProperty(new QSvgTransformStyle(QTransform(matrix)), attributes.id);
     }
 
 }
@@ -1974,7 +1980,7 @@ static void parseOpacity(QSvgNode *node,
 
     if (ok) {
         QSvgOpacityStyle *opacity = new QSvgOpacityStyle(qBound(qreal(0.0), op, qreal(1.0)));
-        node->appendStyleProperty(opacity, someId(attributes));
+        node->appendStyleProperty(opacity, attributes.id);
     }
 }
 
@@ -2046,7 +2052,7 @@ static void parseCompOp(QSvgNode *node,
 
     if (!value.isEmpty()) {
         QSvgCompOpStyle *compop = new QSvgCompOpStyle(svgToQtCompositionMode(value));
-        node->appendStyleProperty(compop, someId(attributes));
+        node->appendStyleProperty(compop, attributes.id);
     }
 }