Add flag to blowUp or not

[robertoschwald]

Currently, Scalr always blows up (scales-up) images which are too small for the given max-width/height.

It would be great if there is a possiblity to set a non-blowup Mode, so too small images will not be scaled up.

[ghost]

Robert, can you clarify the behavior a bit more -- I don't quite understand.

For example, the current behavior: If you have a 100x100 image and pass in a max width/height of say 500, imgscalr will "blow up" or resize the image to 500x500.

Given that example (or maybe a different one you had in mind) what kind of behavior did you want imgscalr to have?

[robertoschwald]

Currently, if I don't want small images to be scaled up, I need to compute the scale factor outside of Scalr to decide if I need to rescale or not. It would be great if I can set a mode in Scalr, which only resizes if the image is too big for maxWidth or maxHeight and otherwise does not scale. This is what I call blowUp (true/false) in my former scaling method.

[ghost]

Robert, can you paste the code for your current impl here so I can see exactly what you are asking for?

It sounds like you want a mode where imgscalr honors a primary dimension (same as Scalr.Mode now) exactly instead of the current targetWidth and targetHeight, you want to provide maxWidth and maxHeight dimensions, and if the image is already within those dimensions, then do nothing -- is that right?

[robertoschwald]

Here is the code I use to decide if I need to scale or not. If image is too small, scalr is not called (so no blowUp happens). blowUp is a boolean in my method signature.

    ...
    // calculate if vertical or horizontal scaling is required
    float imageWidth = rgbImage.getWidth();
    float imageHeight = rgbImage.getHeight();
    float verticalScale = maxHeight / imageHeight;
    float horizontalScale = maxWidth / imageWidth;
    float scale = verticalScale;
    if (horizontalScale < verticalScale) scale = horizontalScale;
    if (!blowUp && scale > 1) scale = 1;
    if (scale != 1){
      // Resize
      rgbImage = Scalr.resize(rgbImage, Scalr.Method.QUALITY, Scalr.Mode.AUTOMATIC, maxWidth, maxHeight);
    }
    ...

[ghost]

Thanks Robert!