Pixelfed/PixelDroid-App-Android
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Limit BlurHash ratio

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This commit is contained in:
Matthieu 2022-08-21 00:25:52 +02:00
parent f96496e22d
commit ce4d9d7082
1 changed files with 7 additions and 2 deletions
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9
app/src/main/java/org/pixeldroid/app/utils/BlurHashDecoder.kt
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@ -19,8 +19,13 @@ import kotlin.math.withSign
object BlurHashDecoder { object BlurHashDecoder {
fun blurHashBitmap(resources: Resources, blurHash: String, width: Int?, height: Int?): BitmapDrawable { fun blurHashBitmap(resources: Resources, blurHash: String, width: Int?, height: Int?): BitmapDrawable {
val ratioOr0 = (width?.toFloat() ?: 1f) / (height?.toFloat() ?: 1f)
// The call to `decode` is expensive (costs scale linearly on ratio or 1/ratio), so
// the ratio should be contained within 1/100 and 100 (which seem reasonable)
val ratioOr0 = ((width?.toFloat() ?: 1f) / (height?.toFloat() ?: 1f)).coerceIn(1/100f, 100f)
// Width and/or height may be 0 here (bad information sent by server).
// In that case, we make a square 32x32
val ratio = if (ratioOr0 == 0f) 1f else ratioOr0 val ratio = if (ratioOr0 == 0f) 1f else ratioOr0
return BitmapDrawable(resources, return BitmapDrawable(resources,
decode(blurHash, decode(blurHash,
@ -51,7 +56,7 @@ object BlurHashDecoder {
} else { } else {
val from = 4 + i * 2 val from = 4 + i * 2
val colorEnc = decode83(blurHash, from, from + 2) val colorEnc = decode83(blurHash, from, from + 2)
decodeAc(colorEnc, maxAc * punch) decodeAc(colorEnc, maxAc *punch)
} }
} }
return composeBitmap(width, height, numCompX, numCompY, colors) return composeBitmap(width, height, numCompX, numCompY, colors)