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Re: Continuous image scrolling

From: Clément Pit-Claudel
Subject: Re: Continuous image scrolling
Date: Thu, 5 Apr 2018 15:56:51 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0

On 2018-04-04 23:54, Tak Kunihiro wrote:
>>> I think with the following setup,
>>> M-x pixel-scroll-mode
>>> (setq pixel-resolution-fine-flag t)
>>> a buffer with large images, as you shown, can be scrolled by height of 
>>> typical line.
>> I think I must be doing something wrong :/
>> I used this snippet to insert 10 copies of a large picture in a new buffer:
>>    (dotimes (_ 10)
>>       (insert (propertize " " 'display '(image :type jpeg :file 
>> "some-large-picture.jpg" :scale 1)) "\n"))
>> and then I turned pixel-scroll-mode on with the setting you mentioned, but 
>> Emacs still scrolls by full images.
> Let me assume height of an image is less than height of visible area of
> a window.
> M-x pixel-scroll-mode
> (setq pixel-resolution-fine-flag t)
> M-: (pixel-scroll-up 1)
> The (pixel-scroll-up 1) scrolls a buffer up by (frame-char-height) with
> re-displaying each pixel.
> A function that scrolls a buffer up like (pixel-scroll-up 1) but without
> re-displaying each pixel, should be written.  The function serves as
> alternative of (scroll-up).

I don't understand. I followed your instructions, but M-: (pixel-scroll-up 1) 
scrolls up by a full image.

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