Runtime rasterized fonts are completely broken

[NicusorN5]

Release Type: Github latest master branch
Version: Current master branch

Related to #1692 and #1700 . This issue represents the possible root cause to these two issues.
Platform(s): Windows

Describe the bug
Attempting to
To Reproduce
Steps to reproduce the behavior:

• Same as FontManager.RenderBitmap() access violation exception #1692 . Create a new project with the Animation template. Wait for segmentation faults.
  OR
• Creating a new project:
  1.) Create a new blank project
  2.) Add a UI Page
  3.) Try to add a Text block.
  4.) Memory error at FontManager.RenderBitmap(). Or any other error related to SharpFont. YMMV.

Workaround
Do not use Stride's default font. Avoid using runtime rasterized fonts. Manually create and assign font assets.

Expected behavior
Proper rendering of the fonts.

Screenshots
A possible clue and warning sign is that Stride itself shows that it can't load fonts. The default font is broken, and it is used by default when adding UI elements, thus possibly triggering a segfault.

Also, as a consequence, button texts are non-existent. No crashes are seen when working with buttons. Crashes can be triggered if editing the button text or text block.

Log and callstacks

There are different crashes caused by this same issue.

Stacktrace 1

>	SharpFont.dll!SharpFont.GlyphSlot.RenderGlyph(SharpFont.RenderMode mode) Line 100	C#
 	Stride.Graphics.dll!Stride.Graphics.Font.FontManager.RenderBitmap(Stride.Graphics.Font.CharacterSpecification character, SharpFont.Face fontFace) Line 159	C#
 	Stride.Graphics.dll!Stride.Graphics.Font.FontManager.BuildBitmapThread() Line 321	C#
 	Stride.Core.dll!Stride.Core.Diagnostics.SafeAction.Wrap.AnonymousMethod__0() Line 22	C#
 	System.Private.CoreLib.dll!System.Threading.Thread.StartHelper.RunWorker() Line 73	C#
 	System.Private.CoreLib.dll!System.Threading.Thread.StartHelper.Callback(object state) Line 43	C#
 	System.Private.CoreLib.dll!System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state) Line 184	C#
 	System.Private.CoreLib.dll!System.Threading.Thread.StartHelper.Run() Line 50	C#
 	System.Private.CoreLib.dll!System.Threading.Thread.StartCallback() Line 106	C#

Editor error 1

System.OverflowException: Arithmetic operation resulted in an overflow.
   at Stride.Graphics.Font.FontManager.GenerateCharacterGlyph(CharacterSpecification character, Boolean renderBitmap) in D:\Dev\Stride\sources\engine\Stride.Graphics\Font\FontManager.cs:line 120
   at Stride.Graphics.Font.FontManager.GenerateBitmap(CharacterSpecification characterSpecification, Boolean synchronously) in D:\Dev\Stride\sources\engine\Stride.Graphics\Font\FontManager.cs:line 101
   at Stride.Graphics.Font.RuntimeRasterizedSpriteFont.GetGlyph(CommandList commandList, Char character, Vector2& fontSize, Boolean uploadGpuResources, Vector2& fixScaling) in D:\Dev\Stride\sources\engine\Stride.Graphics\Font\RuntimeRasterizedSpriteFont.cs:line 111
   at Stride.Graphics.SpriteFont.ForGlyph[T](CommandList commandList, StringProxy& text, Vector2& fontSize, GlyphAction`1 action, T& parameters, Int32 forStart, Int32 forEnd, Boolean updateGpuResources, Single startX, Single startY) in D:\Dev\Stride\sources\engine\Stride.Graphics\SpriteFont.cs:line 575
   at Stride.Graphics.SpriteFont.ForEachGlyph[T](CommandList commandList, StringProxy& text, Vector2& requestedFontSize, GlyphAction`1 action, T& parameters, TextAlignment scanOrder, Boolean updateGpuResources, Nullable`1 textBoxSize) in D:\Dev\Stride\sources\engine\Stride.Graphics\SpriteFont.cs:line 512
   at Stride.Graphics.SpriteFont.MeasureString(StringProxy& text, Vector2& size) in D:\Dev\Stride\sources\engine\Stride.Graphics\SpriteFont.cs:line 452
   at Stride.UI.Controls.TextBlock.CalculateTextSize(StringProxy textToMeasure) in D:\Dev\Stride\sources\engine\Stride.UI\Controls\TextBlock.cs:line 261
   at Stride.UI.Controls.TextBlock.CalculateTextSize(String textToMeasure) in D:\Dev\Stride\sources\engine\Stride.UI\Controls\TextBlock.cs:line 208
   at Stride.UI.Controls.TextBlock.MeasureOverride(Vector3 availableSizeWithoutMargins) in D:\Dev\Stride\sources\engine\Stride.UI\Controls\TextBlock.cs:line 215
   at Stride.UI.UIElement.Measure(Vector3 availableSizeWithMargins) in D:\Dev\Stride\sources\engine\Stride.UI\UIElement.cs:line 908
   at Stride.UI.Controls.ContentControl.MeasureOverride(Vector3 availableSizeWithoutMargins) in D:\Dev\Stride\sources\engine\Stride.UI\Controls\ContentControl.cs:line 90
   at Stride.UI.Controls.Button.MeasureOverride(Vector3 availableSizeWithoutMargins) in D:\Dev\Stride\sources\engine\Stride.UI\Controls\Button.cs:line 183
   at Stride.UI.UIElement.Measure(Vector3 availableSizeWithMargins) in D:\Dev\Stride\sources\engine\Stride.UI\UIElement.cs:line 908
   at Stride.UI.Panels.StackPanel.MeasureOverride(Vector3 availableSizeWithoutMargins) in D:\Dev\Stride\sources\engine\Stride.UI\Panels\StackPanel.cs:line 217
   at Stride.UI.UIElement.Measure(Vector3 availableSizeWithMargins) in D:\Dev\Stride\sources\engine\Stride.UI\UIElement.cs:line 908
   at Stride.Rendering.UI.UIRenderFeature.DrawInternal(RenderDrawContext context, RenderView renderView, RenderViewStage renderViewStage, Int32 startIndex, Int32 endIndex) in D:\Dev\Stride\sources\engine\Stride.UI\Rendering\UI\UIRenderFeature.cs:line 234
   at Stride.Rendering.UI.UIRenderFeature.Draw(RenderDrawContext context, RenderView renderView, RenderViewStage renderViewStage, Int32 startIndex, Int32 endIndex) in D:\Dev\Stride\sources\engine\Stride.UI\Rendering\UI\UIRenderFeature.cs:line 86
   at Stride.Rendering.RenderSystem.Draw(RenderDrawContext renderDrawContext, RenderView renderView, RenderStage renderStage) in D:\Dev\Stride\sources\engine\Stride.Rendering\Rendering\RenderSystem.cs:line 341
   at Stride.Rendering.Compositing.ForwardRenderer.DrawView(RenderContext context, RenderDrawContext drawContext, Int32 eyeIndex, Int32 eyeCount) in D:\Dev\Stride\sources\engine\Stride.Engine\Rendering\Compositing\ForwardRenderer.cs:line 555
   at Stride.Rendering.Compositing.ForwardRenderer.DrawCore(RenderContext context, RenderDrawContext drawContext) in D:\Dev\Stride\sources\engine\Stride.Engine\Rendering\Compositing\ForwardRenderer.cs:line 750
   at Stride.Rendering.Compositing.SceneRendererBase.Draw(RenderDrawContext context) in D:\Dev\Stride\sources\engine\Stride.Rendering\Rendering\Compositing\SceneRendererBase.cs:line 38
   at Stride.Rendering.Compositing.EditorTopLevelCompositor.DrawInner(RenderDrawContext context) in D:\Dev\Stride\sources\engine\Stride.Engine\Rendering\Compositing\EditorTopLevelCompositor.cs:line 61
   at Stride.Rendering.Compositing.SceneCameraRenderer.DrawCore(RenderContext context, RenderDrawContext drawContext) in D:\Dev\Stride\sources\engine\Stride.Engine\Rendering\Compositing\SceneCameraRenderer.cs:line 70
   at Stride.Rendering.Compositing.SceneRendererBase.Draw(RenderDrawContext context) in D:\Dev\Stride\sources\engine\Stride.Rendering\Rendering\Compositing\SceneRendererBase.cs:line 38
   at Stride.Rendering.Compositing.GraphicsCompositor.DrawCore(RenderDrawContext context) in D:\Dev\Stride\sources\engine\Stride.Engine\Rendering\Compositing\GraphicsCompositor.cs:line 116
   at Stride.Rendering.RendererBase.Draw(RenderDrawContext context) in D:\Dev\Stride\sources\engine\Stride.Rendering\Rendering\RendererBase.cs:line 49
   at Stride.Engine.SceneSystem.Draw(GameTime gameTime) in D:\Dev\Stride\sources\engine\Stride.Engine\Engine\SceneSystem.cs:line 232
   at Stride.Games.GameSystemCollection.Draw(GameTime gameTime) in D:\Dev\Stride\sources\engine\Stride.Games\GameSystemCollection.cs:line 125
   at Stride.Games.GameBase.Draw(GameTime gameTime) in D:\Dev\Stride\sources\engine\Stride.Games\GameBase.cs:line 795
   at Stride.Editor.EditorGame.Game.EditorServiceGame.Draw(GameTime gameTime) in D:\Dev\Stride\sources\editor\Stride.Editor\EditorGame\Game\EditorServiceGame.cs:line 214

[NicusorN5]

Upon further findings, it appears that the default Stride font asset is utterly broken. The sprite font asset is not editable.

I may assume that there's no source code that validates the fonts.

[NicusorN5]

Upon some findings that I made today, I found out that runtime rasterized fonts cause the specified issues.

A workaround is fully avoiding runtime rasterized fonts.

[NicusorN5]

This is a minor bug regarding the font assets being rendered in editor. I didn't decide to create a new issue for that since this is also related to runtime rasterized fonts.

There was a previous runtime rasterized SpriteFont font asset. It was deleted, then recreated as a offline rasterized font.

Stride.Font.asset.bug.mp4

It appears that crashing when editing the font asset are gone for some reason?

[NicusorN5]

This is not reproductible under the latest Stride release.

[Eideren]

So, should we close this ?

[NicusorN5]

I'm not sure, I can always reproduce this on my machine, on the latest master commit. This was the case even before the last few patches.

[NicusorN5]

Can anyone else reproduce this?

Steps are:
1.) Locally build Stride
2.) Create a SpriteFont asset that's offline rasterized (should properly work, just a sanity check)
3.) Create a runtime rasterized SpriteFont asset. Should be marked as broken ('X' asset icon)

[Eideren]

Built under ef3fc7e and I couldn't repro:

Does the asset errors tab report anything ?

Edit: Nevermind, it's on one of the screenshot you shared