加入awebp编码支持

tests/apng-thumbnail.test.js

@@ -57,7 +57,11 @@ for (const root of ['.', 'release/UNIVERSAL_SpineViewer']) {
 	assert.match(script, /const outputSize = profile\.size \|\| size/);
 	assert.match(script, /return smallest;/);
 	assert.doesNotMatch(script, /throw new Error\(t\('viewer\.animatedCannotFit'/);
-	assert.match(script, /extension: '\.png'/);
+	assert.match(script, /require\('\.\.\/js\/animated-webp-encoder\.js'\)/);
+	assert.match(script, /async function encodeAnimatedWebpToLimit/);
+	assert.match(script, /canvas\.toDataURL\('image\/webp', profile\.quality\)/);
+	assert.match(script, /extension: options\.format === 'apng' \? '\.png' : '\.webp'/);
+	assert.match(script, /for \(let alpha = 3; alpha < rgba\.length; alpha \+= 4\) rgba\[alpha\] = 255/);
 	assert.match(script, /const totalFrames = Math\.max\(1, frameOf\(animationLength\)\)/);
 	assert.match(script, /start: startFrame \/ FPS/);
 	assert.match(html, /id="animatedThumbStart" type="number" min="0" step="1"/);
@@ -67,6 +71,7 @@ for (const root of ['.', 'release/UNIVERSAL_SpineViewer']) {
 	assert.doesNotMatch(html, /id="animatedThumbQuality"/);
 	assert.doesNotMatch(html, /viewer\.secondsUnit/);
 	assert.match(html, /id="animatedThumbDialog"/);
+	assert.match(html, /id="animatedThumbFormat"><option value="webp">AWebP \(\.webp\)<\/option><option value="apng">APNG \(\.png\)<\/option>/);
 	assert.match(css, /\.animated-thumb-form \{[^}]*grid-template-columns: 96px minmax\(0, 1fr\)/);
 	assert.match(css, /\.animated-thumb-form input\[type="number"\]/);
 }