Add Extended RGB model to QColor

Can be used to represent wide-gamut and HDR colors.

Change-Id: I1cca442069ce2f2c070f723fe930fe1f2f5580ad
Reviewed-by: Lars Knoll <lars.knoll@qt.io>

1 files changed, 20 insertions, 1 deletions

diff --git a/src/gui/painting/qcolortrc_p.h b/src/gui/painting/qcolortrc_p.h
index 3a649f3756..3ef9d442fc 100644
--- a/src/gui/painting/qcolortrc_p.h
+++ b/src/gui/painting/qcolortrc_p.h
@@ -91,7 +91,16 @@ public:
             return m_fun.apply(x);
         return x;
     }
-
+    float applyExtended(float x) const
+    {
+        if (x >= 0.0f && x <= 1.0f)
+            return apply(x);
+        if (m_type == Type::Function)
+            return std::copysign(m_fun.apply(std::abs(x)), x);
+        if (m_type == Type::Table)
+            return x < 0.0f ? 0.0f : 1.0f;
+        return x;
+    }
     float applyInverse(float x) const
     {
         if (m_type == Type::Table)
@@ -100,6 +109,16 @@ public:
             return m_fun.inverted().apply(x);
         return x;
     }
+    float applyInverseExtended(float x) const
+    {
+        if (x >= 0.0f && x <= 1.0f)
+            return applyInverse(x);
+        if (m_type == Type::Function)
+            return std::copysign(applyInverse(x), x);
+        if (m_type == Type::Table)
+            return x < 0.0f ? 0.0f : 1.0f;
+        return x;
+    }
 
     friend inline bool operator!=(const QColorTrc &o1, const QColorTrc &o2);
     friend inline bool operator==(const QColorTrc &o1, const QColorTrc &o2);