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How to draw a transparent bitmap to another bitmap?

I had loaded a  bitmap with parts of transparent by using BITMAP_PIXEL_FORMAT_ARGB8888, and merge to another bitmap. and the result bitmap had white background color in the merge area. How to draw without the white color? I had test that it can keep the transparent area in canva, but I need to draw and save a large image to content. Thanks.

Edited by: Brock Boland on 17 3월, 2014 Reason: Paragraph tags added automatically from tizen_format_fix module.
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Slawek Kowalski
Probably because bitmap is immutable. You can create Canva object and draw into it your both bitmaps and do other graphics operations if need. When your finish write pixels.