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js: Split setting nominal and actual canvas size

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Now zooming in and out repeatedly doesn't cause the canvas to wither
away, but user resizes don't stick any more.  Still more to do.
This commit is contained in:
Ben Harris
2022-10-27 11:27:22 +01:00
parent 532d662722
commit 9783bbfbc0
2 changed files with 23 additions and 7 deletions
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2
emcc.c
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@ -82,6 +82,7 @@ extern void js_canvas_copy_from_blitter(int id, int x, int y, int w, int h);
extern void js_canvas_make_statusbar(void); extern void js_canvas_make_statusbar(void);
extern void js_canvas_set_statusbar(const char *text); extern void js_canvas_set_statusbar(const char *text);
extern void js_canvas_set_size(int w, int h); extern void js_canvas_set_size(int w, int h);
extern void js_canvas_set_nominal_size();
extern void js_dialog_init(const char *title); extern void js_dialog_init(const char *title);
extern void js_dialog_string(int i, const char *title, const char *initvalue); extern void js_dialog_string(int i, const char *title, const char *initvalue);
@ -189,6 +190,7 @@ static void resize(void)
w = h = INT_MAX; w = h = INT_MAX;
midend_size(me, &w, &h, false); midend_size(me, &w, &h, false);
js_canvas_set_size(w, h); js_canvas_set_size(w, h);
js_canvas_set_nominal_size();
canvas_w = w; canvas_w = w;
canvas_h = h; canvas_h = h;
} }

28
emcclib.js
View File

@ -539,20 +539,34 @@ mergeInto(LibraryManager.library, {
/* /*
* void js_canvas_set_size(int w, int h); * void js_canvas_set_size(int w, int h);
* *
* Set the size of the puzzle canvas. Called at setup, and every * Set the size of the puzzle canvas. Called whenever the size of
* time the user picks new puzzle settings requiring a different * the canvas needs to change. That might be because of a change
* size. * of configuration, because the user has resized the puzzle, or
* because the device pixel ratio has changed.
*/ */
js_canvas_set_size: function(w, h) { js_canvas_set_size: function(w, h) {
var dpr = window.devicePixelRatio || 1;
onscreen_canvas.width = w; onscreen_canvas.width = w;
offscreen_canvas.width = w; offscreen_canvas.width = w;
resizable_div.style.width = w / dpr + "px"; resizable_div.style.width = w / (window.devicePixelRatio || 1) + "px";
nominal_width = w / dpr;
onscreen_canvas.height = h; onscreen_canvas.height = h;
offscreen_canvas.height = h; offscreen_canvas.height = h;
nominal_height = h / dpr; },
/*
* void js_canvas_set_nominal_size();
*
* Set the nominal size of the puzzle to the current canvas size
* scaled to CSS pixels. This should be called whenever the
* canvas size is changed other than in response to a change of
* device pixel ratio. This nominal size will then be used at
* every change of device pixel ratio to calculate the new
* physical size of the canvas.
*/
js_canvas_set_nominal_size: function() {
var dpr = window.devicePixelRatio || 1;
nominal_width = onscreen_canvas.width / dpr;
nominal_height = onscreen_canvas.height / dpr;
}, },
/* /*