[Libreoffice-bugs] [Bug 134237] New: Rending using SKIA produces lag when scrolling (and mouse-scrolling to zoom) multiple high-resolution images in Draw

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=134237

            Bug ID: 134237
           Summary: Rending using SKIA produces lag when scrolling (and
                    mouse-scrolling to zoom) multiple high-resolution
                    images in Draw
           Product: LibreOffice
           Version: 7.0.0.0.beta1+
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Draw
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: mwtjunkmail at gmail.com

Description:
When using SKIA rather than hardware acceleration when there are several
high-resolution images on a Draw Page, holding down the mouse button and the
control button to zoom in and out, or just using the mouse button to scroll up
and down, produces lag. The image continues to move in and out or up and down
long after I finish using the mouse, and I can't do anything else until the
redraw eventually finishes.

I have anti-aliasing enabled both with and without SKIA.

Regardless of rendering method used, the image, when zoomed in and scrolled up
and down, has rendering artifacts on it (image isn't updated so leaves a banded
effect). Scrolling again removes it.

Steps to Reproduce:
1. Launch LO Draw
2. Incorporate multiple high-resolution images on a slide (I used 3 1920x1080
images on a 21.33 x 21.33 canvas)
3. Control-Mouse to zoom in and out. If you move the mouse very slowly, it's
fine. Scroll as one would expect to scroll producing a document, and it's
laggy.

Actual Results:
Document locks up while the redraw finishes and/or continues to zoom in and out
long after I let up on the mouse.

Hardware rendering isn't necessarily fast or smooth, but at least it remains
responsive.

Expected Results:
Program should react without lag to zooming up and down and in and out.


Reproducible: Always


User Profile Reset: No



Additional Info:
nvidia 1050 TI graphics card, 3770K I-7 processor.  Could very well be that the
processor simply is no longer beefy enough to keep up, but that doesn't explain
why I don't have similar lag issues with high-resoluition images using Krita,
paint.net, and Inkscape.


Version: 7.0.0.0.beta2 (x64)
Build ID: 1c213561a365b5666167321de68c9977500c9612
CPU threads: 8; OS: Windows 10.0 Build 20150; UI render: default; VCL: win
Locale: en-US (en_US); UI: en-US
Calc: CL

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