Request font sizes with only 0.5pt resolution.

When animating pointSize avoid generating a huge number of fonts with
slightly different point sizes.

Task-number: QTBUG-13960
Reviewed-by: Aaron Kennedy
(cherry picked from commit f111e97adf93a933351eb5658b33a5820097757a)

6 files changed, 54 insertions, 20 deletions

diff --git a/src/declarative/graphicsitems/qdeclarativetext.cpp b/src/declarative/graphicsitems/qdeclarativetext.cpp
index 2f3c8e5..640965c 100644
--- a/src/declarative/graphicsitems/qdeclarativetext.cpp
+++ b/src/declarative/graphicsitems/qdeclarativetext.cpp
@@ -736,19 +736,28 @@ QDeclarativeText::~QDeclarativeText()
 QFont QDeclarativeText::font() const
 {
     Q_D(const QDeclarativeText);
-    return d->font;
+    return d->sourceFont;
 }
 
 void QDeclarativeText::setFont(const QFont &font)
 {
     Q_D(QDeclarativeText);
-    if (d->font == font)
+    if (d->sourceFont == font)
         return;
 
+    d->sourceFont = font;
+    QFont oldFont = d->font;
     d->font = font;
-    d->updateLayout();
+    if (d->font.pointSizeF() != -1) {
+        // 0.5pt resolution
+        qreal size = qRound(d->font.pointSizeF()*2.0);
+        d->font.setPointSizeF(size/2.0);
+    }
+
+    if (oldFont != d->font)
+        d->updateLayout();
 
-    emit fontChanged(d->font);
+    emit fontChanged(d->sourceFont);
 }
 
 /*!
diff --git a/src/declarative/graphicsitems/qdeclarativetext_p_p.h b/src/declarative/graphicsitems/qdeclarativetext_p_p.h
index 67f2289..e749bc9 100644
--- a/src/declarative/graphicsitems/qdeclarativetext_p_p.h
+++ b/src/declarative/graphicsitems/qdeclarativetext_p_p.h
@@ -79,6 +79,7 @@ public:
 
     QString text;
     QFont font;
+    QFont sourceFont;
     QColor  color;
     QDeclarativeText::TextStyle style;
     QColor  styleColor;
diff --git a/src/declarative/graphicsitems/qdeclarativetextedit.cpp b/src/declarative/graphicsitems/qdeclarativetextedit.cpp
index d072064..cb62a2c 100644
--- a/src/declarative/graphicsitems/qdeclarativetextedit.cpp
+++ b/src/declarative/graphicsitems/qdeclarativetextedit.cpp
@@ -326,22 +326,35 @@ void QDeclarativeTextEdit::setTextFormat(TextFormat format)
 QFont QDeclarativeTextEdit::font() const
 {
     Q_D(const QDeclarativeTextEdit);
-    return d->font;
+    return d->sourceFont;
 }
 
 void QDeclarativeTextEdit::setFont(const QFont &font)
 {
     Q_D(QDeclarativeTextEdit);
+    if (d->sourceFont == font)
+        return;
+
+    d->sourceFont = font;
+    QFont oldFont = d->font;
     d->font = font;
+    if (d->font.pointSizeF() != -1) {
+        // 0.5pt resolution
+        qreal size = qRound(d->font.pointSizeF()*2.0);
+        d->font.setPointSizeF(size/2.0);
+    }
 
-    clearCache();
-    d->document->setDefaultFont(d->font);
-    if(d->cursor){
-        d->cursor->setHeight(QFontMetrics(d->font).height());
-        moveCursorDelegate();
+    if (oldFont != d->font) {
+        clearCache();
+        d->document->setDefaultFont(d->font);
+        if(d->cursor){
+            d->cursor->setHeight(QFontMetrics(d->font).height());
+            moveCursorDelegate();
+        }
+        updateSize();
+        update();
     }
-    updateSize();
-    update();
+    emit fontChanged(d->sourceFont);
 }
 
 /*!
diff --git a/src/declarative/graphicsitems/qdeclarativetextedit_p_p.h b/src/declarative/graphicsitems/qdeclarativetextedit_p_p.h
index 68a9cc8..3a45541 100644
--- a/src/declarative/graphicsitems/qdeclarativetextedit_p_p.h
+++ b/src/declarative/graphicsitems/qdeclarativetextedit_p_p.h
@@ -92,6 +92,7 @@ public:
 
     QString text;
     QFont font;
+    QFont sourceFont;
     QColor  color;
     QColor  selectionColor;
     QColor  selectedTextColor;
diff --git a/src/declarative/graphicsitems/qdeclarativetextinput.cpp b/src/declarative/graphicsitems/qdeclarativetextinput.cpp
index 57a2177..ef3404f 100644
--- a/src/declarative/graphicsitems/qdeclarativetextinput.cpp
+++ b/src/declarative/graphicsitems/qdeclarativetextinput.cpp
@@ -213,24 +213,33 @@ void QDeclarativeTextInput::setText(const QString &s)
 QFont QDeclarativeTextInput::font() const
 {
     Q_D(const QDeclarativeTextInput);
-    return d->font;
+    return d->sourceFont;
 }
 
 void QDeclarativeTextInput::setFont(const QFont &font)
 {
     Q_D(QDeclarativeTextInput);
-    if (d->font == font)
+    if (d->sourceFont == font)
         return;
 
+    d->sourceFont = font;
+    QFont oldFont = d->font;
     d->font = font;
+    if (d->font.pointSizeF() != -1) {
+        // 0.5pt resolution
+        qreal size = qRound(d->font.pointSizeF()*2.0);
+        d->font.setPointSizeF(size/2.0);
+    }
 
-    d->control->setFont(d->font);
-    if(d->cursorItem){
-        d->cursorItem->setHeight(QFontMetrics(d->font).height());
-        moveCursor();
+    if (oldFont != d->font) {
+        d->control->setFont(d->font);
+        if(d->cursorItem){
+            d->cursorItem->setHeight(QFontMetrics(d->font).height());
+            moveCursor();
+        }
+        updateSize();
     }
-    updateSize();
-    emit fontChanged(d->font);
+    emit fontChanged(d->sourceFont);
 }
 
 /*!
diff --git a/src/declarative/graphicsitems/qdeclarativetextinput_p_p.h b/src/declarative/graphicsitems/qdeclarativetextinput_p_p.h
index 18e9c81..16827b3 100644
--- a/src/declarative/graphicsitems/qdeclarativetextinput_p_p.h
+++ b/src/declarative/graphicsitems/qdeclarativetextinput_p_p.h
@@ -107,6 +107,7 @@ public:
     QLineControl* control;
 
     QFont font;
+    QFont sourceFont;
     QColor  color;
     QColor  selectionColor;
     QColor  selectedTextColor;