ColorIndexedImage_ stores the state of a WorldCanvas::drawImage() rendering after the chosen data plane has been resampled to screen (Pixelcanvas) pixels and scaled to indices within a fixed-size Colormap, but prior to mapping to actual colors for display. More...

Public Member Functions
	ColorIndexedImage_ ()
void	clear ()
Bool	maskValid ()
Public Attributes
Matrix< uInt >	data
Matrix< Bool >	mask
Vector< Int >	blc
uInt	colormapSize

Detailed Description

ColorIndexedImage_ stores the state of a WorldCanvas::drawImage() rendering after the chosen data plane has been resampled to screen (Pixelcanvas) pixels and scaled to indices within a fixed-size Colormap, but prior to mapping to actual colors for display.

'Caching' of this state is useful in 24-bit (TrueColor) applications, greatly speeding up redrawing when only the mapping to colors is changed.

Packaging this state allows different instances to be cached by different callers of drawImage() if desired, to be reused by them when appropriate via WC::redrawIndexedImage(). Reuse is 'appropriate' only when nothing has changed since the original drawImage() call except the actual colors assigned to the map indices; among other things, the size of the Colormap used must be the same as that of the original.

Note: this level of 'caching' is distinct from the more elaborate 'drawlists' which are supported by WC/PC and cached in DisplayMethods.

Definition at line 1293 of file WorldCanvas.h.