Opened 11 years ago

Closed 5 years ago

#9381 closed enhancement (fixed)

Better access to bitmap mask data

Reported by: gverbruggen Owned by:
Priority: normal Milestone:
Component: GUI-all Version:
Keywords: wxBitmap wxMask Cc: gverbruggen, vadz
Blocked By: Blocking:
Patch: no


Currently it is not possible to access a the content of a wxMask.

A mask can always be created from a bitmap, but an existing mask cannot be manipulated.
In the wxMSW port, wxBitmap has a method GetMaskBitmap, which allows to work around this problem
(extract the mask as a bitmap, manipulate the bitmap and create a new mask from the bitmap).
However other ports (at least wxGTK) do not have this method.

More specific, I am looking for a way to tile a number of bitmaps with masks into another larger bitmap, also having a mask. The masks of the source bitmaps should be copied into the mask of the target bitmap.
(as far as I can see, the Blit operation takes into account the source mask, but it does not modify the mask
of the target)

A GetBitmap method on wxMask, returning the mask as a monochrome bitmap, would solve the problem.

Change History (3)

comment:1 Changed 10 years ago by vadz

Implementing this should be possible under wxGTK too (we have GdkBitmap in the mask and we need to create GdkPixmap from it, shouldn't be difficult) and I agree that not being able to access the mask is strange.

comment:2 Changed 10 years ago by wojdyr

  • Component set to GUI-all
  • Keywords wxBitmap wxMask added
  • Status changed from new to confirmed

comment:3 Changed 5 years ago by PC

  • Resolution set to fixed
  • Status changed from confirmed to closed

(In [73409]) add wxMask::GetBitmap(), closes #9381

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