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js: Set the default colour from the CSS background of the canvas

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This allows the HTML/CSS to decide that it would like a different
background colour without the need to recompile.  The default if the CSS
specifies no colour (and hence the canvas is transparent) is the same
grey as before.
This commit is contained in:
Ben Harris
2022-12-10 17:49:49 +00:00
parent 02f1d55a02
commit 14eb35da4a
2 changed files with 22 additions and 2 deletions
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18
emcclib.js
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@ -143,6 +143,24 @@ mergeInto(LibraryManager.library, {
menuform.elements["preset"].value = n;
},
/*
* void js_default_colour(float *output);
*
* Try to extract a default colour from the CSS computed
* background colour of the canvas element.
*/
js_default_colour: function(output) {
var col = window.getComputedStyle(onscreen_canvas).backgroundColor;
/* We only support opaque sRGB colours. */
var m = col.match(
/^rgb\((\d+(?:\.\d+)?), (\d+(?:\.\d+)?), (\d+(?:\.\d+)?)\)$/);
if (m) {
setValue(output, +m[1] / 255, "float");
setValue(output + 4, +m[2] / 255, "float");
setValue(output + 8, +m[3] / 255, "float");
}
},
/*
* void js_set_background_colour(const char *bg);
*