bug#13887: 24.3; doc-view will render blurry images when image-magick is available

[E Sabof <esabof@gmail.com>]

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I mean pressing + or - moves the page horizontally, instead of changing the
size. I think the way it opens the document is ok.

I'll have a look at the patch and let you know.

Evgeni


On Thu, Mar 7, 2013 at 3:55 PM, Tassilo Horn <tsdh@gnu.org> wrote:

> E Sabof <esabof@gmail.com> writes:
>
> > I had a look at it, there are some issues with zooming. It doesn't
> > work when I open a document that is larger than the window,
>
> Does that mean that you'd like to set the hscoll when the window is
> smaller than the images so that the center of the image is displayed at
> the center of the window?
>
> Hm, this could at least be done once when initially opening some
> document.  When switching pages, the current hscroll is preserved and I
> consider that a good thing.  It shouldn't re-center then.
>
> > and sometimes in other cases.
>
> I know there were some issues/errors when the image of a page isn't
> there already.  That should be fixed by this version of the patch.
>
> --8<---------------cut here---------------start------------->8---
> === modified file 'lisp/doc-view.el'
> --- lisp/doc-view.el    2013-02-28 04:02:36 +0000
> +++ lisp/doc-view.el    2013-03-07 08:14:09 +0000
> @@ -1250,7 +1250,7 @@
>    (when doc-view-pending-cache-flush
>      (clear-image-cache)
>      (setq doc-view-pending-cache-flush nil))
> -  (let ((ol (doc-view-current-overlay))
> +  (let* ((ol (doc-view-current-overlay))
>          (image (if (and file (file-readable-p file))
>                    (if (not (and doc-view-scale-internally
>                                   (fboundp 'imagemagick-types)))
> @@ -1258,9 +1258,20 @@
>                      (unless (member :width args)
>                        (setq args `(,@args :width ,doc-view-image-width)))
>                      (apply 'create-image file 'imagemagick nil args))))
> -        (slice (doc-view-current-slice)))
> +        (slice (doc-view-current-slice))
> +        (img-width (and image (car (image-size image))))
> +        (displayed-img-width (if (and image slice)
> +                                 (* (/ (float (nth 2 slice))
> +                                       (car (image-size image 'pixels)))
> +                                    img-width)
> +                               img-width))
> +        (window-width (window-width (selected-window))))
>      (setf (doc-view-current-image) image)
>      (move-overlay ol (point-min) (point-max))
> +    (when (and image (> window-width displayed-img-width))
> +      (overlay-put ol 'before-string
> +                  (propertize " " 'display
> +                              `(space :align-to (+ center (-0.5 .
> ,displayed-img-width))))))
>      (overlay-put ol 'display
>                   (cond
>                    (image
> --8<---------------cut here---------------end--------------->8---
>
> Bye,
> Tassilo
>

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