Hack for font background when we cannot read from the LCD; Candidate fix for ILI9325 LCD

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4763 42af7a65-404d-4744-a932-0658087f49c3

2 files changed, 47 insertions, 1 deletions

diff --git a/NxWidgets/libnxwidgets/include/cgraphicsport.hxx b/NxWidgets/libnxwidgets/include/cgraphicsport.hxx
index 8eea3d689..b9fbc4d41 100644
--- a/NxWidgets/libnxwidgets/include/cgraphicsport.hxx
+++ b/NxWidgets/libnxwidgets/include/cgraphicsport.hxx
@@ -152,6 +152,36 @@ namespace NXWidgets
     const nxgl_coord_t getY(void) const;
 
     /**
+     * Get the background color that will be used to fill in the spaces
+     * when rendering fonts.  This background color is ONLY used if the
+     * LCD device does not support reading GRAM contents.
+     *
+     * @return.  The current background color being used.
+     */
+
+#ifdef CONFIG_NX_WRITEONLY
+    nxgl_mxpixel_t getBackColor(void) const
+    {
+       return m_backColor;
+    }
+#endif
+
+    /**
+     * Set the background color that will be used to fill in the spaces
+     * when rendering fonts.  This background color is ONLY used if the
+     * LCD device does not support reading GRAM contents.
+     *
+     * @return.  The current background color being used.
+     */
+
+#ifdef CONFIG_NX_WRITEONLY
+    void setBackColor(nxgl_mxpixel_t backColor)
+    {
+       m_backColor = backColor;
+    }
+#endif
+
+    /**
      * Draw a pixel into the window.
      *
      * @param x The window-relative x coordinate of the pixel.
diff --git a/NxWidgets/libnxwidgets/src/cbuttonarray.cxx b/NxWidgets/libnxwidgets/src/cbuttonarray.cxx
index 642a0a562..28f14062b 100644
--- a/NxWidgets/libnxwidgets/src/cbuttonarray.cxx
+++ b/NxWidgets/libnxwidgets/src/cbuttonarray.cxx
@@ -519,9 +519,25 @@ void CButtonArray::drawButton(CGraphicsPort *port, int column, int row, bool use
   pos.x = x + alignX;
   pos.y = y + alignY;
 
-  // And draw the button text
+  // Set the CGraphicsControl background to match the selected background color.
+  // This is only necessary if we cannot read from the LCD.  If we cannot read
+  // from then the font background is set to this background color.
+  // REVISIT:  This begs for a more generalized solution.
+
+#ifdef CONFIG_NX_WRITEONLY
+  nxgl_mxpixel_t saveColor = port->getBackColor();
+  port->setBackColor(backColor);
+#endif
+
+  // And draw the button text.
 
   port->drawText(&pos, &rect, getFont(), *text, 0, text->getLength(), textColor);
+
+  // Restore the default background color
+
+#ifdef CONFIG_NX_WRITEONLY
+  port->setBackColor(saveColor);
+#endif
 }
 
 /**