NxWidgets::CImage: Allow NULL bitmaps. From Petteri Aimonen

NxWidgets/ChangeLog.txt

@@ -347,25 +347,28 @@
 
 1.8 2013-xx-xx Gregory Nutt <[email protected]>
 
-*  NxWM::CMediaPlayer: shell application for an MP3 Media Player with
-   Kconfig settings to enable it.  I plan to write this app to help
-   develop and test the MP3 codec chip driver.  It really doesn't do
-   anything yet except display a text box saying "Coming soon", and I
-   need to minimize the icon size a bit.  From Ken Pettit (2013-5-11).
-*  NxWidgets/nxwm/src/glyph_mediaplayer.cxx:  Smaller version of the
-   media player glyph.  From Ken Pettit (2013-5-12).
-*  NxWidgets/nxwm/include/ccalibration.hxx and src/ccalibration.cxx:
-   Fix a race condition that would cause the calibration screen
-   to fail to come up when its icon was touched (From Ken Pettit,
-   2013-5-12).
-*  Kconfig:  Default priorities for NxWidget and NxWM threads
-   should be 100, not 50, to be consistent with other default priorities.
-*  NxWidgets::CGlyphSliderHorizontal and NxWidgets::CGlyphSliderHorizontalGrip:
-   New widgets added by Ken Pettit (2013-5-15).
-*  NxWidgets/UnitTests/CGlyphSliderHorizontal:  Addes a unit test for the
-   NxWidgets::CGlyphSliderHorizontal class. From Ken Pettit (2013-5-17) .
-*  NxWidgets::CGlyphSliderHorizontal:  Fix a drawing error.  From Ken
-   Pettit (2013-5-17).
-*  UnitTests/*/Makefile and .gitignore:  Update the way that NSH
-   the Unit Tests are registered as built-in NSH applications (2013-5-30).
+* NxWM::CMediaPlayer: shell application for an MP3 Media Player with
+  Kconfig settings to enable it.  I plan to write this app to help
+  develop and test the MP3 codec chip driver.  It really doesn't do
+  anything yet except display a text box saying "Coming soon", and I
+  need to minimize the icon size a bit.  From Ken Pettit (2013-5-11).
+* NxWidgets/nxwm/src/glyph_mediaplayer.cxx:  Smaller version of the
+  media player glyph.  From Ken Pettit (2013-5-12).
+* NxWidgets/nxwm/include/ccalibration.hxx and src/ccalibration.cxx:
+  Fix a race condition that would cause the calibration screen
+  to fail to come up when its icon was touched (From Ken Pettit,
+  2013-5-12).
+* Kconfig:  Default priorities for NxWidget and NxWM threads
+  should be 100, not 50, to be consistent with other default priorities.
+* NxWidgets::CGlyphSliderHorizontal and NxWidgets::CGlyphSliderHorizontalGrip:
+  New widgets added by Ken Pettit (2013-5-15).
+* NxWidgets/UnitTests/CGlyphSliderHorizontal:  Addes a unit test for the
+  NxWidgets::CGlyphSliderHorizontal class. From Ken Pettit (2013-5-17) .
+* NxWidgets::CGlyphSliderHorizontal:  Fix a drawing error.  From Ken
+  Pettit (2013-5-17).
+* UnitTests/*/Makefile and .gitignore:  Update the way that NSH
+  the Unit Tests are registered as built-in NSH applications (2013-5-30).
+* NxWidgets::CImage:  Allow a NULL pointer for a bitmap.  Add protection
+  to prevent dereferencing the NULL pointer.  From Petteri Aimonen
+  (2013-6-3).
 

NxWidgets/libnxwidgets/src/cimage.cxx

@@ -138,19 +138,29 @@ CImage::CImage(CWidgetControl *pWidgetControl, nxgl_coord_t x, nxgl_coord_t y,
 
 void CImage::getPreferredDimensions(CRect &rect) const
 {
-  nxgl_coord_t width  = m_bitmap->getWidth();
-  nxgl_coord_t height = m_bitmap->getHeight();
-
-  if (!m_flags.borderless)
+  if (!m_bitmap)
     {
-      width  += (m_borderSize.left + m_borderSize.right);
-      height += (m_borderSize.top + m_borderSize.bottom);
+      rect.setX(m_rect.getX());
+      rect.setY(m_rect.getY());
+      rect.setWidth(0);
+      rect.setHeight(0);
     }
+  else
+    {
+      nxgl_coord_t width  = m_bitmap->getWidth();
+      nxgl_coord_t height = m_bitmap->getHeight();
 
-  rect.setX(m_rect.getX());
-  rect.setY(m_rect.getY());
-  rect.setWidth(width);
-  rect.setHeight(height);
+      if (!m_flags.borderless)
+        {
+          width  += (m_borderSize.left + m_borderSize.right);
+          height += (m_borderSize.top + m_borderSize.bottom);
+        }
+
+      rect.setX(m_rect.getX());
+      rect.setY(m_rect.getY());
+      rect.setWidth(width);
+      rect.setHeight(height);
+    }
 }
 
 /**
@@ -440,7 +450,7 @@ void CImage::onReleaseOutside(nxgl_coord_t x, nxgl_coord_t y)
 
 void CImage::setImageLeft(nxgl_coord_t column)
 {
-  if (column > 0 && column <= m_bitmap->getWidth())
+  if (m_bitmap && column > 0 && column <= m_bitmap->getWidth())
     {
       m_origin.x = column;
     }
@@ -455,7 +465,7 @@ void CImage::setImageLeft(nxgl_coord_t column)
 
 void CImage::setImageTop(nxgl_coord_t row)
 {
-  if (row > 0 && row <= m_bitmap->getHeight())
+  if (m_bitmap && row > 0 && row <= m_bitmap->getHeight())
     {
       m_origin.x = row;
     }