-Cleaning out references to obsolete class QgsColorTable

-Changed how Paletted bands are drawn as gray scale
-Added cache to QgsColorRampShader to speed up rendering time when using large color tables (still poor)
-Fixed small bug in rendering the palette as a pixmap

git-svn-id: http://svn.osgeo.org/qgis/trunk@9251 c8812cc2-4d05-0410-92ff-de0c093fc19c

Author: ersts

python/core/qgsrasterlayer.sip

@@ -100,7 +100,7 @@ public:
      void drawThumbnail(QPixmap * theQPixmap);
 
     /** \brief Get an 8x8 pixmap of the colour palette. If the layer has no palette a white pixmap will be returned. */
-     QPixmap getPaletteAsPixmap();
+     QPixmap getPaletteAsPixmap(int theBand=1);
 
     /** \brief This is called when the view on the rasterlayer needs to be refreshed (redrawn).   
      */
@@ -498,7 +498,7 @@ public slots:
      *  \param band number
      *  \return pointer to color table
      */
-    QgsColorTable *colorTable ( int theBandNoInt );
+    QList<QgsColorRampShader::ColorRampItem>* getColorTable ( int theBandNoInt );
  protected:
 
     /** reads vector layer specific state from project file Dom node.

src/app/qgsrasterlayerproperties.cpp

@@ -828,7 +828,7 @@ void QgsRasterLayerProperties::sync()
   pixmapLegend->repaint();
 
   //set the palette pixmap
-  pixmapPalette->setPixmap( mRasterLayer->getPaletteAsPixmap() );
+  pixmapPalette->setPixmap( mRasterLayer->getPaletteAsPixmap(mRasterLayer->getRasterBandNumber(mRasterLayer->getGrayBandName())));
   pixmapPalette->setScaledContents( true );
   pixmapPalette->repaint();
 
@@ -1971,7 +1971,7 @@ void QgsRasterLayerProperties::on_pbnHistRefresh_clicked()
        == QgsRasterLayer::PALETTE ) //paletted layers have hard coded color entries
   {
     QPolygonF myPolygon;
-    QgsColorTable *myColorTable = mRasterLayer->colorTable( 1 );
+    QgsColorRampShader* myRasterShaderFunction = ( QgsColorRampShader* )mRasterLayer->getRasterShader()->getRasterShaderFunction();
     QgsDebugMsg( "Making paletted image histogram....computing band stats" );
     QgsDebugMsg( QString( "myLastBinWithData = %1" ).arg( myLastBinWithData ) );
 
@@ -2002,8 +2002,7 @@ void QgsRasterLayerProperties::on_pbnHistRefresh_clicked()
 
         QgsDebugMsg( QString( "myMiddle = %1" ).arg( myMiddle ) );
 
-        bool found = myColorTable->color( myMiddle, &c1, &c2, &c3 );
-        if ( !found )
+        if ( myRasterShaderFunction->generateShadedValue(myMiddle, &c1, &c2, &c3))
         {
           QgsDebugMsg( "Color not found" );
           c1 = c2 = c3 = 180; // grey

src/core/raster/qgscolorrampshader.cpp

@@ -25,10 +25,22 @@ originally part of the larger QgsRasterLayer class
 QgsColorRampShader::QgsColorRampShader( double theMinimumValue, double theMaximumValue ) : QgsRasterShaderFunction( theMinimumValue, theMaximumValue )
 {
   QgsDebugMsg( "called." );
+  mMaximumColorCacheSize = 256; //good starting value
 }
 
 bool QgsColorRampShader::generateShadedValue( double theValue, int* theReturnRedValue, int* theReturnGreenValue, int* theReturnBlueValue )
 {
+  //Get the shaded from the cache if it exists already
+  QColor myColor = mColorCache.value(theValue);
+  if(myColor.isValid())
+  {
+    *theReturnRedValue = myColor.red();
+    *theReturnGreenValue = myColor.green();
+    *theReturnBlueValue = myColor.blue();
+    return true;
+  }
+  
+  //Else we have to generate the shaded value
   if ( QgsColorRampShader::INTERPOLATED == mColorRampType )
   {
     return getInterpolatedColor( theValue, theReturnRedValue, theReturnGreenValue, theReturnBlueValue );
@@ -81,15 +93,16 @@ bool QgsColorRampShader::getDiscreteColor( double theValue, int* theReturnRedVal
     myCurrentRampValue = it->value;
     if ( theValue <= myCurrentRampValue )
     {
-      if ( last_it != mColorRampItemList.end() )
+      *theReturnRedValue = it->color.red();
+      *theReturnGreenValue = it->color.green();
+      *theReturnBlueValue = it->color.blue();
+      //Cache the shaded value
+      if(mMaximumColorCacheSize <= mColorCache.size())
       {
-        *theReturnRedValue = last_it->color.red();
-        *theReturnGreenValue = last_it->color.green();
-        *theReturnBlueValue = last_it->color.blue();
-        return true;
+        mColorCache.insert(theValue, it->color);
       }
+      return true;
     }
-    last_it = it;
   }
 
   return false; // value not found
@@ -109,6 +122,11 @@ bool QgsColorRampShader::getExactColor( double theValue, int* theReturnRedValue,
       *theReturnRedValue = it->color.red();
       *theReturnGreenValue = it->color.green();
       *theReturnBlueValue = it->color.blue();
+      //Cache the shaded value
+      if(mMaximumColorCacheSize <= mColorCache.size())
+      {
+        mColorCache.insert(theValue, it->color);
+      }
       return true;
     }
   }
@@ -143,6 +161,11 @@ bool QgsColorRampShader::getInterpolatedColor( double theValue, int* theReturnRe
         *theReturnRedValue = ( int )(( it->color.red() * myDiffTheValueLastRampValue + last_it->color.red() * myDiffCurrentRampValueTheValue ) / myCurrentRampRange );
         *theReturnGreenValue = ( int )(( it->color.green() * myDiffTheValueLastRampValue + last_it->color.green() * myDiffCurrentRampValueTheValue ) / myCurrentRampRange );
         *theReturnBlueValue = ( int )(( it->color.blue() * myDiffTheValueLastRampValue + last_it->color.blue() * myDiffCurrentRampValueTheValue ) / myCurrentRampRange );
+        //Cache the shaded value
+        if(mMaximumColorCacheSize <= mColorCache.size())
+        {
+          mColorCache.insert(theValue, it->color);
+        }
         return true;
       }
     }

src/core/raster/qgscolorrampshader.h

@@ -22,6 +22,7 @@ originally part of the larger QgsRasterLayer class
 #define QGSCOLORRAMPSHADER_H
 
 #include <QColor>
+#include <QMap>
 
 #include "qgsrastershaderfunction.h"
 
@@ -62,6 +63,9 @@ class CORE_EXPORT QgsColorRampShader : public QgsRasterShaderFunction
     QgsColorRampShader::COLOR_RAMP_TYPE getColorRampType() {return mColorRampType;}
     QString getColorRampTypeAsQString();
 
+    /**Get the maximum size the color cache can be*/
+    int getMaximumColorCacheSize() { return mMaximumColorCacheSize; }
+
     /**Set custom colormap */
     void setColorRampItemList( const QList<QgsColorRampShader::ColorRampItem>& theList ) { mColorRampItemList = theList; }
 
@@ -70,6 +74,9 @@ class CORE_EXPORT QgsColorRampShader : public QgsRasterShaderFunction
 
     /**Set the color ramp type*/
     void setColorRampType( QString );
+    
+    /**Set the maximum size the color cache can be */
+    void setMaximumColorCacheSize(int theSize) { mMaximumColorCacheSize = theSize; }
 
 
 
@@ -85,6 +92,8 @@ class CORE_EXPORT QgsColorRampShader : public QgsRasterShaderFunction
     QList<QgsColorRampShader::ColorRampItem> mColorRampItemList;
 
     QgsColorRampShader::COLOR_RAMP_TYPE mColorRampType;
+    QMap<double, QColor> mColorCache;
+    int mMaximumColorCacheSize; //The color cache could eat a ton of memory if you have 32-bit data
 };
 
 #endif

src/core/raster/qgsrasterbandstats.h

@@ -24,7 +24,7 @@
 
 #include <limits>
 
-#include "qgscolortable.h"
+#include "qgscolorrampshader.h"
 /** \ingroup core
  * The RasterBandStats struct is a container for statistics about a single
  * raster band.
@@ -82,6 +82,6 @@ class CORE_EXPORT QgsRasterBandStats
     /** whehter histogram compuation should include out of range values */
     bool histogramOutOfRangeFlag;
     /** Color table */
-    QgsColorTable colorTable;
+    QList<QgsColorRampShader::ColorRampItem> colorTable;
 };
 #endif