Slow rendering with SKIA on Windows

[vfbb 277]

@Hans♫ Is this an image or a path? (we have to understand if the arrow is being drawn or resized) Can you share the source of this icon?

[Hans♫ 73]

Its a path. Our code looks like this (simplified):

fStroke := TStrokeBrush.Create(TBrushKind.Solid, claSilver);
fStroke.Thickness := 1.5;
fPath := TPathData.Create;
fPath.AddEllipse(RectF(-12, -12, 12, 12));
...
Canvas.DrawPath(fPath, 1, fStroke);

 

[vfbb 277]

@Hans♫ Do you have a blank project simulating this? I drew directly in the form's OnPaint using your example on a blank project and got the same result for all renders, except for the FMX GPU without Skia which seems to be bugged.

scale 1x:

 

scale 2.25x:

[Hans♫ 73]

On 5/12/2024 at 9:06 PM, vfbb said:

Do you have a blank project simulating this?

Yes, I can reproduce this in a blank project. You did not see it because you used gray in gray. When using white on black, then you can see it:

<No Skia | Skia + Vulkan >

 

Enlarged:

<No Skia | Skia + Vulkan >

 

This is produced with an empty app with only this code:

  GlobalUseSkia := true;
  GlobalUseSkiaRasterWhenAvailable := false;
  GlobalUseVulkan := true;
...
procedure TForm1.PaintBox1Paint(Sender: TObject; Canvas: TCanvas);
var
  lStroke: TStrokeBrush;
  lPath: TPathData;
begin
  lStroke := TStrokeBrush.Create(TBrushKind.Solid, claWhite);
  lStroke.Thickness := 1.5;
  lPath := TPathData.Create;
  lPath.AddEllipse(RectF(-12, -12, 12, 12));
  lPath.Translate(50,50);

  Canvas.Fill.Color := claBlack;
  Canvas.FillRect(RectF(0,0,100,100), 0, 0, [], 1);
  Canvas.DrawPath(lPath, 1, lStroke);

  lStroke.Free;
  lPath.Free;
end;

 

[Anders Melander 1655]

4 hours ago, Hans♫ said:

Wow... 2 bit color depth.

This looks like a really bad attempt at supersampling. Or someone got the order of gamma correction mixed up so instead of sRGB->Linear->sRGB they are doing Linear->sRGB->Linear. But that wouldn't explain the 2 bits.

[vfbb 277]

@Hans♫ I used the same code you provided and got satisfactory results. Look:

 

<No Skia> | <Skia + Vulkan>

(Scale 100%)

 

It is difficult to deduce what is happening if the same code is producing different results. That's why I think it would be interesting if we could test it on more machines. The project I used is attached: 

testVulkan.7z

[DelphiUdIT 133]

This is mine, same project of @vfbb    but with 2 graphics surface from the same PC (always with vulkan enable):

 

   Intel               Nvidia

 

Intel: Intel(R) Iris(R) Xe Graphics

Nvidia: NVIDIA GeForce RTX 3070 Ti Laptop GPU

 

P.S.: Vulkan version 1.3.277

Edited May 14 by DelphiUdIT

[Rafal.B 2]

NVIDIA RTX 3000 graphics card
In both cases, GlobalUseSkiaRasterWhenAvailable=False and GlobalUseVulkan=True.
In my opinion, it looks better when GlobalUseSkia = False;

Edited Wednesday at 09:18 AM by Rafal.B

[Lars Fosdal 1739]

S = GlobalUseSkia
V = GlobalUseVulcan

GlobalUseSkiaRasterWhenAvailable = False

 

 

HW: Lenovo P16

Name    NVIDIA RTX A4500 Laptop GPU
PNP Device ID    PCI\VEN_10DE&DEV_24BA&SUBSYS_22DB17AA&REV_A1\4&35D2CA85&0&0008
Adapter Type    NVIDIA RTX A4500 Laptop GPU, NVIDIA compatible
Adapter Description    NVIDIA RTX A4500 Laptop GPU

Name    Intel(R) UHD Graphics
PNP Device ID    PCI\VEN_8086&DEV_4688&SUBSYS_22FB17AA&REV_0C\3&11583659&0&10
Adapter Type    Intel(R) UHD Graphics Family, Intel Corporation compatible
Adapter Description    Intel(R) UHD Graphics