Fixed some inconsistencies for image drawing on non-integer coords.

The fix for 1x1 source rect image drawing in change
ffbb3c1a2aee4134dce80cd144a26bf32865b698 was incorrect for transforms
with type >= TxScale. The aliased coordinate delta needs to be applied
in device coordinates, not in logical coordinates.

Also specialize the non-antialiased TxScale case by simply calling
fillRect_normalized directly, avoiding having to scan convert the
rectangle manually.

Task-number: 251561
Reviewed-by: Trond

1 files changed, 16 insertions, 3 deletions

diff --git a/src/gui/painting/qpaintengine_raster.cpp b/src/gui/painting/qpaintengine_raster.cpp
index cbfd5e3..847904b 100644
--- a/src/gui/painting/qpaintengine_raster.cpp
+++ b/src/gui/painting/qpaintengine_raster.cpp
@@ -2575,9 +2575,10 @@ void QRasterPaintEngine::drawImage(const QRectF &r, const QImage &img, const QRe
     if (!aa && sr.size() == QSize(1, 1)) {
         // as fillRect will apply the aliased coordinate delta we need to
         // subtract it here as we don't use it for image drawing
-        const QRectF targetRect = r.translated(-aliasedCoordinateDelta,
-                                               -aliasedCoordinateDelta);
-        fillRect(targetRect, QColor::fromRgba(img.pixel(sr.x(), sr.y())));
+        QTransform old = s->matrix;
+        s->matrix = s->matrix * QTransform::fromTranslate(-aliasedCoordinateDelta, -aliasedCoordinateDelta);
+        fillRect(r, QColor::fromRgba(img.pixel(sr.x(), sr.y())));
+        s->matrix = old;
         return;
     }
 
@@ -2611,6 +2612,18 @@ void QRasterPaintEngine::drawImage(const QRectF &r, const QImage &img, const QRe
             return;
         d->image_filler_xform.setupMatrix(copy, s->flags.bilinear);
 
+        if (!aa && s->matrix.type() == QTransform::TxScale) {
+            QRectF rr = s->matrix.mapRect(r);
+
+            const int x1 = qRound(rr.x());
+            const int y1 = qRound(rr.y());
+            const int x2 = qRound(rr.right());
+            const int y2 = qRound(rr.bottom());
+
+            fillRect_normalized(QRect(x1, y1, x2-x1, y2-y1), &d->image_filler_xform, d);
+            return;
+        }
+
 #ifdef QT_FAST_SPANS
         ensureState();
         if (s->flags.tx_noshear || s->matrix.type() == QTransform::TxScale) {