Re: Continuous image scrolling

[Clément Pit-Claudel]

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.