[Libreoffice-bugs] [Bug 139172] New: Transparent objects placed on bitmaps appear solid when exported as PNG using "Selection" option

Tue Dec 22 21:32:23 UTC 2020

https://bugs.documentfoundation.org/show_bug.cgi?id=139172

            Bug ID: 139172
           Summary: Transparent objects placed on bitmaps appear solid
                    when exported as PNG using "Selection" option
           Product: LibreOffice
           Version: 7.2.0.0.alpha0+ Master
          Hardware: x86-64 (AMD64)
                OS: Windows (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Draw
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: mwtjunkmail at gmail.com

Description:
Microsoft Windows -- most transparencies export fine for PNG if the entire page
is exported, but treatment of transparencies when exported objects only
produces solid color where transparency is expected.

Steps to Reproduce:
1. Launch Microsoft Windows LO Draw
2. Create a new draw document
3. Import a bitmap picture image
4. Place a square or other object with a color fill on top of the image
5. Set the object's transparency to something other than 0.
6. Export as PNG using the "Selection" option.

Actual Results:
Any portion of a transparent object overlapping a bitmap appears solid.

Expected Results:
How the page appears in LibreOffice is how it should appear when exported.
Again, this problem does not occur when the entire page is exported.

Reproducible: Always

User Profile Reset: No

Additional Info:
Version: 7.2.0.0.alpha0+ (x64)
Build ID: 4041c68ea59181f1c4774c356809066d2051db41
CPU threads: 8; OS: Windows 10.0 Build 21277; UI render: Skia/Vulkan; VCL: win
Locale: en-US (en_US); UI: en-US
Calc: CL

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