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Fix hasAlpha false-positives

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Dragon Fire
2020-03-23 12:56:20 -04:00
parent 0b58de7c7a
commit d4be4851b9
1 changed files with 2 additions and 1 deletions
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util/Canvas.js
+2 -1
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@@ -82,9 +82,10 @@ module.exports = class CanvasUtil {
static hasAlpha(image) { static hasAlpha(image) {
const canvas = createCanvas(image.width, image.height); const canvas = createCanvas(image.width, image.height);
const ctx = canvas.getContext('2d'); const ctx = canvas.getContext('2d');
ctx.drawImage(image, 0, 0);
const data = ctx.getImageData(0, 0, canvas.width, canvas.height).data; const data = ctx.getImageData(0, 0, canvas.width, canvas.height).data;
let hasAlphaPixels = false; let hasAlphaPixels = false;
for (let i = 3, n = data.length; i < n; i += 4) { for (let i = 3; i < data.length; i += 4) {
if (data[i] < 255) { if (data[i] < 255) {
hasAlphaPixels = true; hasAlphaPixels = true;
break; break;