Impala Documentation

void Impala::Application::MediaTable::TableOverviewWindow::UpdatePixelCache ( int height ) [inline]

Definition at line 84 of file TableOverviewWindow.h.

References Impala::Application::MediaTable::TableDataView::GetMark(), ILOG_DEBUG, MarkToColor(), mPixelCacheSynced, mSelPixelCache, mSource, and PixelToRows().

Referenced by DisplayFunc().

00085     {
00086         mSelPixelCache.clear();
00087 
00088         if (height < mSource->GetFilteredRows())
00089         {
00090             ILOG_DEBUG("Updating selection cache...");
00091             // more rows than pixels: sample the rows
00092             for (int pixelrow = 0; pixelrow < height; pixelrow++)
00093             {
00094                 int start, stop;
00095                 PixelToRows(pixelrow, &start, &stop);
00096                 unsigned long avgcol = 0;
00097                 for (int y=start; y<=stop; y++)
00098                 {
00099                     int mark = mSource->GetMark(y);
00100                     if (mark)
00101                     {
00102                         avgcol = MarkToColor(mark);
00103                         break; // only take first color found,instead of average
00104                     }
00105                 }
00106 
00107                 mSelPixelCache.push_back(avgcol);
00108             }
00109             mPixelCacheSynced = true;
00110         }
00111     }

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