Fix the what the IgnorePixelScaling property works

[mattleibow]

Description of Change

Previously the IgnorePixelScaling allowed the drawing code to work in density-independent UI units, however it did so in a poor manner. Instead of scaling the canvas in such a way that it preserved the high density, it stretched and reduced the quality of the image.

This PR makes sure to always draw in high resolution, and then pre-scale the canvas before invoking the paint events.

Bugs Fixed

• Fixes [FEATURE] Rework the IgnorePixelScaling property #1177
• Avoids the need for [Skia/Tizen] Add DeviceScalingFactor on Tizen SkiaGraphicsView dotnet/Microsoft.Maui.Graphics#155

API Changes

None.

Behavioral Changes

A demo of the change.

Before	After

PR Checklist

• Has tests (if omitted, state reason in description)
• Rebased on top of main at time of PR
• Changes adhere to coding standard
• Updated documentation

[myroot]

Hi, this PR meet the our requirements except one thing

We hope to able to update ScalingFactor

SkiaSharp/source/SkiaSharp.Views/SkiaSharp.Views.Tizen/ScalingInfo.cs

Line 30 in 2ad2986

public static double ScalingFactor => scalingFactor.Value;

Because, in several reasons, we need to support a virtual scaling factor.
Could you make a setter on ScalingInfo.ScalingFactor?

[mattleibow]

Because, in several reasons, we need to support a virtual scaling factor.

@myroot I can do that. Do we need to have different scaling factors on different canvases? Or can it all be in one place?

For now I will add a setter to the ScalingInfo type. But we can easily move it to the canvas before we merge this.

Do you have an example of when you would want the scaling to be different to the screen DPI?

[mattleibow]

Adding this as a separate method so it can be a null that can allow for reverting back to the system value.

Is this useful in this global context? Should it be on the individual canvas views?

[myroot]

Good, We apply custom scale as globally, so It works for tizen.

[myroot]

Do you have an example of when you would want the scaling to be different to the screen DPI?

https://github.com/Samsung/Tizen.UIExtensions/blob/d13d130b552a177939d81a12cacf7069c343fa6c/src/Tizen.UIExtensions.ElmSharp/DeviceInfo.cs#L233

Here is a code of setting custom scaling factor on tizen. if this PR was merged, I will add code to call SetScalingFactor in the end of this method

[tipa]

@mattleibow I just stumbled over this and how the IgnorePixelScaling works.
From what I understand the new behavior is different from the document behavior, which was the old one.
The docs still say When true, the canvas is resized to device independent pixels, and then stretched to fill the view.
This isn't the case any more with v2.88.0, is it?