Added BColorModifier_randomize for visualization testing

This BColorModifier is able to blend a color against a
randomized one, by the given amount. This is useful for
testing purposes in th eliving office when making
interactive tests with it.

Change-Id: I96d8b83397783201080682cd4bd75779ef77b238
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/144541
Tested-by: Jenkins
Reviewed-by: Armin Le Grand <Armin.Le.Grand@me.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/include/basegfx/color/bcolormodifier.hxx b/include/basegfx/color/bcolormodifier.hxx
index b39849ed7987..911d74289a17 100644
--- a/include/basegfx/color/bcolormodifier.hxx
+++ b/include/basegfx/color/bcolormodifier.hxx
@@ -290,6 +290,27 @@ namespace basegfx
         SAL_DLLPRIVATE virtual ::basegfx::BColor getModifiedColor(const ::basegfx::BColor& aSourceColor) const override;
     };
 
+    /** mix a part of the original color with randomized color (mainly for debug visualizations)
+    */
+    class SAL_WARN_UNUSED BASEGFX_DLLPUBLIC BColorModifier_randomize final : public BColorModifier
+    {
+    private:
+        // [0.0 .. 1.0] where 0.0 is no randomize, 1.0 is all random and in-between
+        // describes the mixed part. Default is 0.1 which means to mix with 10% random color
+        double                      mfRandomPart;
+
+    public:
+        BColorModifier_randomize(double fRandomPart = 0.1);
+
+        virtual ~BColorModifier_randomize() override;
+
+        // compare operator
+        SAL_DLLPRIVATE virtual bool operator==(const BColorModifier& rCompare) const override;
+
+        // compute modified color
+        SAL_DLLPRIVATE virtual ::basegfx::BColor getModifiedColor(const ::basegfx::BColor& aSourceColor) const override;
+    };
+
     /// typedef to allow working with shared instances of BColorModifier
     /// for the whole mechanism
     typedef std::shared_ptr< BColorModifier > BColorModifierSharedPtr;