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sdl2: fix retina mouse coordinates #822

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Merged
cxxxr merged 4 commits into from
Jul 7, 2023
Merged

sdl2: fix retina mouse coordinates #822

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12724c5
sdl2: fix typo in debug statement
seanfarley Jul 7, 2023
280adee
sdl2: add scaled-char-{width,height} methods to display
seanfarley Jul 7, 2023
908b9b0
sdl2: fix mouse x,y on retina screens
seanfarley Jul 7, 2023
2c19d99
sdl2: use `char-width' convenience function
seanfarley Jul 7, 2023
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sdl2: add scaled-char-{width,height} methods to display 
These methods take a raw (x,y) input (in pixels) from sdl2 and multiply
it by the dpi scale (usually 2 for retina screens, otherwise 1) and then
multiply that by the char-{width,height}.
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@seanfarley
seanfarley committed Jul 7, 2023
commit 280adee73511d6f639f3ac6c084d4e2bca3aa4f2
8 changes: 8 additions & 0 deletions frontends/sdl2/main.lisp
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Expand Up @@ -176,6 +176,14 @@
(display-latin-font display)
(display-cjk-normal-font display)))))

(defmethod scaled-char-width ((display display) x)
(let ((scale-x (round (first (display-scale display)))))
(floor (* scale-x x) (char-width))))

(defmethod scaled-char-height ((display display) y)
(let ((scale-y (round (second (display-scale display)))))
(floor (* scale-y y) (char-height))))

(defmethod update-display ((display display))
(sdl2:render-present (display-renderer display)))

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