Why EDID is not trustworthy for DPI
mjg59 at srcf.ucam.org
Wed Oct 5 21:35:58 UTC 2011
On Wed, Oct 05, 2011 at 11:11:38PM +0200, Benny Amorsen wrote:
> Matthew Garrett <mjg59 at srcf.ucam.org> writes:
> > We have no technological solution for dealing with the fact that
> > applications may move from one DPI to another at runtime, and may even
> > be displaying on both displays at once.
> >From a technology viewpoint, that is actually theoretically easy to
> handle on modern hardware: Render everything as 3D objects and let the
> graphics hardware scale as appropriate.
This... works badly. Really. Open gimp and add some text. Now double the
size of the font. Save the image and open it in image viewer, and zoom
out so the text is half the size. It doesn't look the same as your
Rendering fonts (and even SVGs) well requires you to know the scale that
you're rendering to. More pixels mean you can add more detail. If you
shrink that then the additional detail is still there, getting in the
way of the actually important information. Doing this properly requires
that the original object renderer be part of the scaling process, and
doing that on the fly with reasonable performance just isn't part of our
rendering stack at the moment.
Matthew Garrett | mjg59 at srcf.ucam.org
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