Magnifier tool renders scaled buffer instead of original image resolution

[Elashar]

Hello,

First of all, thank you for YACReader, it’s an excellent manga reader.

I noticed that the magnifier tool appears to enlarge the currently rendered (fit-to-screen) image instead of sampling directly from the original image resolution. When comparing the two:

• Regular zoom (+) -> sharp features, uses original image data.
• Magnifier tool -> slightly blurred, seems to upscale the displayed buffer.
  So it seems that the magnifier is scaling the already downscaled framebuffer rather than cropping and re-rendering from the original QImage.

Would it be possible to implement a true-resolution magnifier that crops the region directly from the original image, scales that region independently, and allows inspection up to (or beyond) 1:1 pixel mapping? Since the original image is already loaded in memory, this wouldn’t add significant performance cost. This would improve small and fine-detail inspection, especially in smaller laptops.

Below is an example comparing regular zoom and the magnifier when starting from fit-to-screen mode on a 1920×1200 display using a 1500×2250 manga image:

Thank you for considering it.