New algorithm for drawing thin lines

Added a new QCosmeticStroker class for drawing thin
lines. The class can handle both aliased and antialiased
lines.

The code replaces all the midpoint line drawing algorithms in
the raster paintengine and gives correct subpixel positioning
for lines.

It gives around 30% to 50% speedup against the midpoint algorithm. If
we missed that fast path, the speedup is around between a factor of
6 to 8 for lines and aliased paths and 100 and 400 for antialiased
paths.

Reviewed-by: Kim

1 files changed, 0 insertions, 5 deletions

diff --git a/src/gui/painting/qpaintengine_raster_p.h b/src/gui/painting/qpaintengine_raster_p.h
index 52f51fa..122c2b8 100644
--- a/src/gui/painting/qpaintengine_raster_p.h
+++ b/src/gui/painting/qpaintengine_raster_p.h
@@ -196,9 +196,6 @@ public:
     void stroke(const QVectorPath &path, const QPen &pen);
     void fill(const QVectorPath &path, const QBrush &brush);
 
-    void strokePolygonCosmetic(const QPoint *pts, int pointCount, PolygonDrawMode mode);
-    void strokePolygonCosmetic(const QPointF *pt, int pointCount, PolygonDrawMode mode);
-
     void clip(const QVectorPath &path, Qt::ClipOperation op);
     void clip(const QRect &rect, Qt::ClipOperation op);
     void clip(const QRegion &region, Qt::ClipOperation op);
@@ -328,8 +325,6 @@ public:
     bool isUnclipped_normalized(const QRect &rect) const;
     bool isUnclipped(const QRect &rect, int penWidth) const;
     bool isUnclipped(const QRectF &rect, int penWidth) const;
-    ProcessSpans getPenFunc(const QRect &rect, const QSpanData *data) const;
-    ProcessSpans getPenFunc(const QRectF &rect, const QSpanData *data) const;
     ProcessSpans getBrushFunc(const QRect &rect, const QSpanData *data) const;
     ProcessSpans getBrushFunc(const QRectF &rect, const QSpanData *data) const;