[Libreoffice-bugs] [Bug 134352] New: Skia engine leaves scaled raster images far blurrier than does hardware rendering

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=134352

            Bug ID: 134352
           Summary: Skia engine leaves scaled raster images far blurrier
                    than does hardware rendering
           Product: LibreOffice
           Version: 7.0.0.0.beta1+
          Hardware: x86-64 (AMD64)
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Draw
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: mwtjunkmail at gmail.com

Description:
This https://i.imgur.com/0NP4IJ8.png is three exports from the same LO Draw
document.

The top image is output using hardware rendering with anti-aliasing.
The middle image is output using SKIA without anti-aliasing.
The bottom image is output using SKIA with anti-aliasing.

I have always been used to the output quality of the top image. I'm quite
surprised of the level of degradation in scaling SKIA puts out.

Steps to Reproduce:
1. Launch LO Draw
2. Import or copy/paste a large raster image
3. Scale the image down until it's about 1/4 to 1/5 the original size
4. Export a PNG three times using different output methods
4a. hardware with anti-aliasing
4b. Skia with anti-aliasing
4c. Skia without anti-aliasing

Actual Results:
Only the hardware rendering option produced a crisp image. Skia-rendered scaled
raster images are unacceptably blurry

Expected Results:
The skia output option should produce as equally crisp images as hardware
rendering.


Reproducible: Always


User Profile Reset: No



Additional Info:
Version: 7.0.0.0.beta2 (x64)
Build ID: 1c213561a365b5666167321de68c9977500c9612
CPU threads: 8; OS: Windows 10.0 Build 20152; UI render: default; VCL: win
Locale: en-US (en_US); UI: en-US
Calc: CL

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