Hello Dianne,
On Mon, Aug 30, 2010 at 1:07 PM, Dianne Hackborn <hack...@android.com>wrote:
> Don't use overlays...? :} Seriously, most overlay hardware doesn't support
> blending. Depending on the hardware, you may be able to get a jagged (1-bpp
> alpha) shape of the cursor, but some hardware only supports rectangles so
> you couldn't get even that.
>
> Thanks for the reply. I am able to see the same mouse cursor properly in
same hardware, when I am using qt-embedded as the underlying graphics
system. Thus I thought that technically this is possible to do.
I wanted to know, whether from basic image(Bitmap) rendering point of view,
am I missing something, which may not be very specific to mouse image
rendering, but in general any bitmap image rendering.
Thanks and regards
-Nitin
> Also a mouse cursor is not a feature of the base platform, so there is
> little infrastructure to support such a thing in all possible situations it
> could appear... such as on top of an overlay.
>
> On Mon, Aug 30, 2010 at 12:32 AM, Nitin Mahajan <np.maha...@gmail.com>wrote:
>
>> Hello,
>>
>> I am trying to display a mouse cursor in rowboat. In the file
>> windowmanagerservice.java I have replaced the cursor drawing code with the
>> following lines to draw a png instead of the default cursor.
>>
>> Bitmap _scratch = BitmapFactory.decodeFile("arrow.png");
>> mCanvas.drawColor(0x0);
>> mCanvas.drawBitmap(_scratch, 0, 0, null);
>>
>> When this cursor is drawn on the Graphics overlay, it's blending
>> happens properly and I get to see the expected cursor image. The cursor
>> image has a proper alpha channel.
>>
>> When I start playing some video(with overlays enabled) and when graphics
>> plane is on top with transparent background, the mouse cursor image displays
>> with a black color patch around it, over the video display area. This
>> suggests that the alpha blending for the mouse image is not happening
>> properly in this case.
>>
>> Can I get some hints as to what would be wrong in this case?
>>
>> regards
>> -Nitin
>>
>> --
>> unsubscribe:
>> android-porting+unsubscr...@googlegroups.com<android-porting%2bunsubscr...@googlegroups.com>
>> website: http://groups.google.com/group/android-porting
>>
>
>
>
> --
> Dianne Hackborn
> Android framework engineer
> hack...@android.com
>
> Note: please don't send private questions to me, as I don't have time to
> provide private support, and so won't reply to such e-mails. All such
> questions should be posted on public forums, where I and others can see and
> answer them.
>
>
--
unsubscribe: android-porting+unsubscr...@googlegroups.com
website: http://groups.google.com/group/android-porting
