Fix: NativeRendering text for non-integer screen scaling

Commit 6e883c53 introduced snapping to pixel grid for non-integer
device pixel ratios. But the snapping also modified the w element of
the coord vector, which resulted in mangled and offset rendering.

As a driveby, add the dpr snapping also to the outlinetext shader, as
it improves rendering quality.

Fixes: QTBUG-70481
Fixes: QTBUG-78160
Change-Id: I4c4b1788005514adc0255878ba24cdf1acc6755f
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@qt.io>

1 files changed, 37 insertions, 0 deletions

diff --git a/tests/manual/scenegraph_lancelot/data/text/text_style2.qml b/tests/manual/scenegraph_lancelot/data/text/text_style2.qml
new file mode 100644
index 0000000000..984ca6a1ed
--- /dev/null
+++ b/tests/manual/scenegraph_lancelot/data/text/text_style2.qml
@@ -0,0 +1,37 @@
+import QtQuick 2.0
+
+//vary font style
+
+Item {
+    width: 320
+    height: 480
+
+    Column {
+        anchors.fill: parent
+        Repeater {
+            model: [Text.Normal, Text.Outline, Text.Raised, Text.Sunken]
+            Text {
+                renderType: Text.QtRendering
+                width: parent.width
+                wrapMode: Text.Wrap
+                font.pointSize: 10
+                style: modelData
+                styleColor: "green"
+                text: "The quick fox jumps in style " + modelData
+            }
+        }
+
+        Repeater {
+            model: [Text.Normal, Text.Outline, Text.Raised, Text.Sunken]
+            Text {
+                renderType: Text.NativeRendering
+                width: parent.width
+                wrapMode: Text.Wrap
+                font.pointSize: 10
+                style: modelData
+                styleColor: "green"
+                text: "The quick fox jumps in style " + modelData
+            }
+        }
+    }
+}