Solid and gradients in high color accuracy

This patch updates the internal color precisions of solids and
gradients to 16bit per color. This makes it possible to render
at higher precision on non-premultiplied ARGB32, the RGB30
formats and any other hi-color formats if more are added.

[ChangeLog][QtGui][Painting] Internal precision of solids and gradients
is now up to 16bit per color.

Change-Id: Ieae5468bd6de1f56adfa4cb9fa966faf2ed824fd
Reviewed-by: Gunnar Sletta <gunnar@sletta.org>

1 files changed, 9 insertions, 0 deletions

diff --git a/src/gui/painting/qrgba64.h b/src/gui/painting/qrgba64.h
index 2ea09e6bd6..51ce4ab10d 100644
--- a/src/gui/painting/qrgba64.h
+++ b/src/gui/painting/qrgba64.h
@@ -88,6 +88,9 @@ public:
         return fromRgba(rgb >> 16, rgb >> 8, rgb, rgb >> 24);
     }
 
+    Q_DECL_CONSTEXPR bool isOpaque() const { return c.alpha == 0xffff; }
+    Q_DECL_CONSTEXPR bool isTransparent() const { return c.alpha == 0; }
+
     Q_DECL_CONSTEXPR quint16 red()   const { return c.red; }
     Q_DECL_CONSTEXPR quint16 green() const { return c.green; }
     Q_DECL_CONSTEXPR quint16 blue()  const { return c.blue; }
@@ -133,6 +136,12 @@ public:
         return rgba;
     }
 
+    QRgba64 operator=(quint64 _rgba)
+    {
+        rgba = _rgba;
+        return *this;
+    }
+
 private:
     static Q_DECL_CONSTEXPR uint div_257_floor(uint x) { return  (x - (x >> 8)) >> 8; }
     static Q_DECL_CONSTEXPR uint div_257(uint x) { return div_257_floor(x + 128); }