An APIExtension method to allow the addition of new APIs to retain compatibility with previous versions of gdi.dll CGraphicsContext WARNING: Function for internal use ONLY. Compatibility is not guaranteed in future releases.An API extension for CGraphics context replacing a reserved virtual method. Effectively allows multiple methods to use just one ordinal number.

The method performs an alpha blending of the source data, aSrcBmp, with the CBitmapContext , using the data from aAlphaBmp as an alpha blending factor. For information on how this function works, see the other overload.

Performs a bitmap block transfer.

This pure virtual function is implemented in derived classes.

Performs a bitmap block transfer of a rectangular piece of a bitmap.

If the specified rectangle is larger than the bitmap then the bitmap is padded with white.

This pure virtual function is implemented in derived classes.

Performs a masked bitmap block transfer.

The mask bitmap can be used as either a positive or negative mask. Masked pixels are not mapped to the destination rectangle.

This function uses either a black and white (binary) mask bitmap, or if aMaskBitmap's display mode is EGray256, alpha blending is used. Use of any other mode may result in unpredictable results

With aInvertMask=EFalse, black pixels in the mask bitmap stop corresponding pixels in the source bitmap from being transferred to the destination rectangle. With aInvertMask=ETrue, white pixels in the mask bitmap stop corresponding pixels in the source bitmap from being transferred to the destination rectangle.

Note that if the mask bitmap is smaller than the source bitmap, then it is tiled across the bitmap. Note that the mask is applied before the piece of the bitmap is defined - the mask is tiled relative to the top left of the original source bitmap rather than the top left of the bitmap piece.

This pure virtual function is implemented in derived classes.

Clears the whole bitmap.

The cleared area is filled with the current brush colour.

This pure virtual function is implemented in derived classes.

Clears a rectangular area of a bitmap.

The cleared area is filled with the current brush colour.

This pure virtual function is implemented in derived classes.

Copies a rectangle.

This pure virtual function is implemented in derived classes.

A reserved virtual function for future use.

Sets whether the graphics context is faded.

Sets the fading parameters.

This function allows you to override the map used when drawing with a faded graphics context (GC). However if you draw to a faded window with a faded GC, then fading on the GC is ignored and the fading of the window is used.

Fading is used to change the colour of a window to make other windows stand out. Fading can either make a faded window closer to white or closer to black.

Fading re-maps colours in the faded GC to fall between the specified black and white map values. If aBlackMap=0 and aWhiteMap=255 then the colours are mapped unchanged. As the values converge the colours are mapped to a smaller range - so the differences between colours in the faded GC decrease. If the values are reversed then the colours are inverted (i.e. where the GC would be black, it is now white).