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js: Move much of the handling of device pixel ratios to the mid-end

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Now that the mid-end knows how to do it, we can remove some complexity
from the front end.
This commit is contained in:
Ben Harris
2022-11-07 23:02:06 +00:00
parent e45cd43aaa
commit ad9ee5a524
3 changed files with 21 additions and 63 deletions
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11
emccpre.js
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@ -30,12 +30,6 @@ var ctx;
// by js_canvas_end_draw.
var update_xmin, update_xmax, update_ymin, update_ymax;
// Nominal size of the canvas in CSS pixels. This is set when the
// canvas is explicitly resized, and used as the basis of calls to
// midend_size whenever the device pixel ratio changes. That way
// changes of zoom levels in browsers will generally be reversible.
var nominal_width, nominal_height;
// Module object for Emscripten. We fill in these parameters to ensure
// that Module.run() won't be called until we're ready (we want to do
// our own init stuff first), and that when main() returns nothing
@ -540,8 +534,7 @@ function initPuzzle() {
* <https://developer.mozilla.org/en-US/docs/Web/API/Window/
* devicePixelRatio> (CC0) to work on older browsers.
*/
var rescale_puzzle = Module.cwrap('rescale_puzzle',
'void', ['number', 'number']);
var rescale_puzzle = Module.cwrap('rescale_puzzle', 'void', []);
var mql = null;
var update_pixel_ratio = function() {
var dpr = window.devicePixelRatio;
@ -549,7 +542,7 @@ function initPuzzle() {
mql.removeListener(update_pixel_ratio);
mql = window.matchMedia(`(resolution: ${dpr}dppx)`);
mql.addListener(update_pixel_ratio);
rescale_puzzle(nominal_width * dpr, nominal_height * dpr);
rescale_puzzle();
}
Module.onRuntimeInitialized = function() {