[Libreoffice-bugs] [Bug 139170] New: Make OutputDevice::EmulateDrawTransparent(() redundant

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=139170

            Bug ID: 139170
           Summary: Make OutputDevice::EmulateDrawTransparent(() redundant
           Product: LibreOffice
           Version: 6.0.0.3 release
          Hardware: All
                OS: other
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: graphics stack
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: chris.sherlock79 at gmail.com

Description:
We currently have a function OutputDevice::EmulateDrawTransparent(). This is
used because OutputDevice::DrawTransparentNatively() can fail, because a number
of our VCL backends don't guarantee the drawing of PolyPolygons and
PolyPolylines. 


We need the following backends to guarantee the drawing of PolyPolygons:

* X11SalGraphicsImpl::drawFilledTrapezoids()
* GenPspGraphics::drawPolyPolygon()

The following backends need to guarantee the drawing of PolyLines:

* X11SalGraphicsImpl::drawPolyLine()
* GenPspGraphics::drawPolyLine()
* AquaSalGraphics::drawPolyLine() - note this can only fail if using IOS


Steps to Reproduce:
n/a

Actual Results:
n/a

Expected Results:
n/a


Reproducible: Always


User Profile Reset: No



Additional Info:
We can basically remove OutputDevice::EmulateDrawTransparent() and then
collapse OutputDevice::DrawTransparentNatively() into
OutputDevice::DrawTransparent(). 

This will remove a lot of code that currently needs to be maintained. It will
hopefully speed up things also.

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