Apply slight z-offsets to distance field glyphs

When rendering distance field text, z-fighting may occur between
adjacent glyphs. To prevent this, we apply a very slight Z offset
to each rendered glyph.

Change-Id: I19f9808267547ae9521757c6022b4f65c1ca4ba5
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/src/extras/text/qtext2dentity.cpp b/src/extras/text/qtext2dentity.cpp
index dbd4368bc..1dfd171cd 100644
--- a/src/extras/text/qtext2dentity.cpp
+++ b/src/extras/text/qtext2dentity.cpp
@@ -209,10 +209,10 @@ void QText2DEntityPrivate::setCurrentGlyphRuns(const QVector<QGlyphRun> &runs)
                 texCoords.setWidth(texCoords.width() * insideRatio);
             }
 
-            data.vertex << x1 << y1 << 0.f << texCoords.left() << texCoords.bottom();
-            data.vertex << x1 << y2 << 0.f << texCoords.left() << texCoords.top();
-            data.vertex << x2 << y1 << 0.f << texCoords.right() << texCoords.bottom();
-            data.vertex << x2 << y2 << 0.f << texCoords.right() << texCoords.top();
+            data.vertex << x1 << y1 << i << texCoords.left() << texCoords.bottom();
+            data.vertex << x1 << y2 << i << texCoords.left() << texCoords.top();
+            data.vertex << x2 << y1 << i << texCoords.right() << texCoords.bottom();
+            data.vertex << x2 << y2 << i << texCoords.right() << texCoords.top();
 
             data.index << data.vertexCount << data.vertexCount+3 << data.vertexCount+1;
             data.index << data.vertexCount << data.vertexCount+2 << data.vertexCount+3;