MCGR: Improve performance for texture-mapped MCGR processing

Change-Id: I20b32e7c272112c6c3d9f7ee0ef59c6d4d006d94
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/150020
Tested-by: Jenkins
Reviewed-by: Armin Le Grand <Armin.Le.Grand@me.com>

2 files changed, 11 insertions, 6 deletions

diff --git a/drawinglayer/inc/texture/texture.hxx b/drawinglayer/inc/texture/texture.hxx
index 54ace6ba3b47..01d3ec5c64c5 100644
--- a/drawinglayer/inc/texture/texture.hxx
+++ b/drawinglayer/inc/texture/texture.hxx
@@ -52,6 +52,10 @@ namespace drawinglayer::texture
             basegfx::ColorStops                 mnColorStops;
             double                              mfBorder;
 
+            // provide a single buffer entry used for gradient texture
+            // mapping, see ::modifyBColor implementations
+            mutable basegfx::ColorStopRange     maLastColorStopRange;
+
             // check if we need last-ColorStop-correction
             bool checkPenultimate();
 
diff --git a/drawinglayer/source/texture/texture.cxx b/drawinglayer/source/texture/texture.cxx
index 1390ee3d82bf..0960ffbbbde3 100644
--- a/drawinglayer/source/texture/texture.cxx
+++ b/drawinglayer/source/texture/texture.cxx
@@ -78,6 +78,7 @@ namespace drawinglayer::texture
         , mnRequestedSteps(nRequestedSteps)
         , mnColorStops(rColorStops)
         , mfBorder(fBorder)
+        , maLastColorStopRange()
         {
         }
 
@@ -265,7 +266,7 @@ namespace drawinglayer::texture
 
             // texture-back-transform X/Y -> t [0.0..1.0] and determine color
             const double fScaler(basegfx::utils::getLinearGradientAlpha(rUV, maGradientInfo));
-            rBColor = basegfx::utils::modifyBColor(mnColorStops, fScaler, mnRequestedSteps);
+            rBColor = basegfx::utils::modifyBColor(mnColorStops, fScaler, mnRequestedSteps, maLastColorStopRange);
         }
 
         GeoTexSvxGradientAxial::GeoTexSvxGradientAxial(
@@ -392,7 +393,7 @@ namespace drawinglayer::texture
             const double fScaler(basegfx::utils::getAxialGradientAlpha(rUV, maGradientInfo));
 
                 // we use the reverse ColorSteps here, so mirror scaler value
-            rBColor = basegfx::utils::modifyBColor(mnColorStops, 1.0 - fScaler, mnRequestedSteps);
+            rBColor = basegfx::utils::modifyBColor(mnColorStops, 1.0 - fScaler, mnRequestedSteps, maLastColorStopRange);
         }
 
 
@@ -484,7 +485,7 @@ namespace drawinglayer::texture
 
             // texture-back-transform X/Y -> t [0.0..1.0] and determine color
             const double fScaler(basegfx::utils::getRadialGradientAlpha(rUV, maGradientInfo));
-            rBColor = basegfx::utils::modifyBColor(mnColorStops, fScaler, mnRequestedSteps);
+            rBColor = basegfx::utils::modifyBColor(mnColorStops, fScaler, mnRequestedSteps, maLastColorStopRange);
         }
 
 
@@ -585,7 +586,7 @@ namespace drawinglayer::texture
 
             // texture-back-transform X/Y -> t [0.0..1.0] and determine color
             const double fScaler(basegfx::utils::getEllipticalGradientAlpha(rUV, maGradientInfo));
-            rBColor = basegfx::utils::modifyBColor(mnColorStops, fScaler, mnRequestedSteps);
+            rBColor = basegfx::utils::modifyBColor(mnColorStops, fScaler, mnRequestedSteps, maLastColorStopRange);
         }
 
 
@@ -679,7 +680,7 @@ namespace drawinglayer::texture
 
             // texture-back-transform X/Y -> t [0.0..1.0] and determine color
             const double fScaler(basegfx::utils::getSquareGradientAlpha(rUV, maGradientInfo));
-            rBColor = basegfx::utils::modifyBColor(mnColorStops, fScaler, mnRequestedSteps);
+            rBColor = basegfx::utils::modifyBColor(mnColorStops, fScaler, mnRequestedSteps, maLastColorStopRange);
         }
 
 
@@ -780,7 +781,7 @@ namespace drawinglayer::texture
 
             // texture-back-transform X/Y -> t [0.0..1.0] and determine color
             const double fScaler(basegfx::utils::getRectangularGradientAlpha(rUV, maGradientInfo));
-            rBColor = basegfx::utils::modifyBColor(mnColorStops, fScaler, mnRequestedSteps);
+            rBColor = basegfx::utils::modifyBColor(mnColorStops, fScaler, mnRequestedSteps, maLastColorStopRange);
         }