White on white reversal on ImageGraphic

[williamkbentley]

Open this iModel in DTA:
fe1d63a6-a5db-4b2d-bd55-80c9cd403079r-eeea5eb9b1199d05a7c2f75b6f3eaf2227c86868.zip

It contains two DrawingGraphic elements that were created with the following code:

export const insertDrawingGraphic = async (
  elementProps: GeometricElement2dProps,
  imageGraphicProps: ImageGraphicCreateProps,
  textureProps: TextureCreateProps
): Promise<Id64String | undefined> => {
  ...
  // get iModelDb and acquire locks
  ... 
  
  // insert texture
  const textureId = Texture.insertTexture(
    iModel,
    textureProps.model,
    "name", // Code value of texture. TODO
    textureProps.format,
    textureProps.data,
    "A texture named name" // TODO: get from user
  );

  // insert drawing graphic
  if (textureId) {
    const corners: ImageGraphicCorners = ImageGraphicCorners.fromJSON(imageGraphicProps.corners);
    const imageGraphic = new ImageGraphic(corners, textureId, imageGraphicProps.hasBorder);
    
    const geometryStreamBuilder = new GeometryStreamBuilder();
    geometryStreamBuilder.appendImage(imageGraphic);
    const geomStream = geometryStreamBuilder.geometryStream;

    const elemProps: GeometricElement2dProps = {
      classFullName: DrawingGraphic.classFullName,
      geom: geomStream,
      placement: elementProps.placement,
      category: elementProps.category,
      model: elementProps.model,
      code: { spec: "0x1", scope: "0x1" } as CodeProps // todo
    };
	
    // insert element
    const newId = iModel.elements.insertElement(elemProps);
    return newId;
  }

  return undefined;
};

When viewed in the drawing, there is White-on-white reversal. Changing the ViewFlag for whiteOnWhiteReversal helps for the DrawingGraphics, but other elements become hidden.

Questions:

• Is this working as designed?
• Is there be a way for a DrawingGraphic or Texture to override wowReversal?

[pmconne]

Is there be a way for a DrawingGraphic or Texture to override wowReversal?

No.

Is this working as designed?

This is not working as designed. ImageGraphics are a new addition for iModels with no direct analog in MicroStation, so they don't need to support white-on-white reversal; and it doesn't make sense to apply white-on-white reversal to texture images.

Thank you for reporting this, we will fix it.

Separately, please consider whether the new iModel-based drawing production workflows should support or rely upon white-on-white reversal in the first place or if we can eliminate that weird quirk for newly-produced sheets and drawings.

[claudiaareneee]

I also noticed some wonkiness with WoW and the RenderGraphics for TextDecoration in display-test-app. I'm currently working on adding frames with border and fill colors.

Essentially, I'm adding a Loop to the geometry stream of the GeometryStreamBuilder and updating the GeometryParams to have a fill color and line color.

The issue is when WoW is on and I have the fill color set to either true black or true white. Basically, if there is a fill color present, I would like to ignore the white-on-white reversal flag.

Screen.Recording.2025-04-09.at.1.29.35.PM.mov

[bbastings]

The issue is when WoW is on and I have the fill color set to either true black or true white. Basically, if there is a fill color present, I would like to ignore the white-on-white reversal flag.

To prevent white-on-white reversal you can use a color like 255, 255, 254 instead of pure white.

[bbastings]

Separately, please consider whether the new iModel-based drawing production workflows should support or rely upon white-on-white reversal in the first place or if we can eliminate that weird quirk for newly-produced sheets and drawings.

It is somewhat problematic to not support it if some users like working with a white sheet background and others prefer black. If there is the option for the user to change/override the sheet background, then you can get into the situation where drawing graphics are no longer visible without supporting white on white reversal...

[claudiaareneee]

Also, yeah I agree. I think there's value to white-on-white in drawing production. @Josh-Schifter could probably verify that.

[Josh-Schifter]

I think I need to reluctantly agree that there is value for exactly the reason Brien gives. It essentially the dark-mode / light-mode debate. There is no clear winner whatever each or our personal preferences are.

[pmconne]

I also noticed some wonkiness with WoW and the RenderGraphics for TextDecoration

@claudiaareneee you can resolve this by putting your decorations in a GraphicBranch and override the white-on-white view flag. (But, it sucks that everyone who creates graphics has to somehow know that their white stuff might turn black and do something to prevent it).

[claudiaareneee]

Okay cool. I'll check that out.

[pmconne]

Fixed in #7964.