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Markup images not rendered correctly in 16.2.3
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flashk View Drop Down
Groupie
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Joined: 04 March 2008
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Points: 44 		Post Options Post Options   Thanks (0) Thanks(0)   Quote flashk Quote  Post ReplyReply Direct Link To This Post Topic: Markup images not rendered correctly in 16.2.3
    Posted: 25 August 2013 at 6:16pm
I just upgraded from 15.0.2 to 16.2.3 and noticed that markup controls don't render images with alpha channels correctly. I've attached a screenshot showing the difference between the two versions.



I'm using the following markup to specify the image from its resource ID (based on a 32-bit PNG):
<Image Source='1200' VerticalAlignment='Center' />

Is this a known issue? Do I need to change the markup or other setting to render the image correctly?
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flashk View Drop Down
Groupie
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Points: 44 		Post Options Post Options   Thanks (1) Thanks(1)   Quote flashk Quote  Post ReplyReply Direct Link To This Post Posted: 12 September 2013 at 5:52pm
I believe I've found why the images are not being rendered correctly. The code for rendering markup images was changed from: 
HDC hDC = pDC->GetDC();
m_pImage->Draw(CDC::FromHandle(hDC), CPoint(0, 0), szRender);
pDC->ReleaseDC(hDC);
to: 
pDC->DrawImage(m_pImage, CRect(0, 0, szRender.cx, szRender.cy));
This change seems to cause the image to be drawn using GDI+ instead of GDI. The CXTPMarkupGdiPlusDeviceContext class seems to draw images with alpha channels incorrectly. In CXTPMarkupGdiPlusDeviceContext::IconToGdiplusBitmap, the PixelFormat32bppARGB flag is used to create the bitmap for rendering. However, I believe the flag should be changed to PixelFormat32bppPARGB, since the CXTPImageManagerIcon object stores pre-multiplied alpha values.

Making this one change seems to fix the image rendering issues for me.
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markr View Drop Down
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Points: 443 		Post Options Post Options   Thanks (0) Thanks(0)   Quote markr Quote  Post ReplyReply Direct Link To This Post Posted: 13 February 2014 at 12:18am
It would be really nice to get this problem fixed in the XTP sources.
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astoyan View Drop Down
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Joined: 24 August 2013
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Points: 302 		Post Options Post Options   Thanks (0) Thanks(0)   Quote astoyan Quote  Post ReplyReply Direct Link To This Post Posted: 01 July 2015 at 8:08pm
Thank you, flashk, for the suggestion. The fix has been added.
Regards,
  Alexander
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markr View Drop Down
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Points: 443 		Post Options Post Options   Thanks (0) Thanks(0)   Quote markr Quote  Post ReplyReply Direct Link To This Post Posted: 02 July 2015 at 9:38am
> The fix has been added.

Excellent, thanks!
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