Optimizes Blurhash generation

2024-05-31 14:24:55 -04:00
parent 071da53a6a
commit 3a9637ccb9
6 changed files with 508 additions and 65 deletions
@@ -0,0 +1,63 @@
+/**
+ * Copyright (c) 2024 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.amethyst.commons.preview
+
+import junit.framework.TestCase.assertTrue
+import org.junit.Assert
+import org.junit.Test
+import kotlin.math.roundToInt
+
+class BlurhashTest {
+    val warmHex = "[45#Y7_2^-xt%OSb%4S0-qt0xbotaRInV|M{RlD~M{M_IVIUNHM{M{M{M{RjNGRkoyj]o[t8tPt8"
+    val testHex = "|NHL-]~pabocs+jDM{j?of4T9ZR+WBWZbdR-WCog04ITn\$t6t6t6t6oJoLZ}?bIUWBs:M{WCogRjs:s+o#R+WBoft7axWBx]IV%LogM{t5xaWBay%KRjxus.WCNGWWt7j[j]s+R-S5ofjYV@j[ofD%t8RPoJt7t7R*WCof"
+
+    @Test
+    fun testAspectRatioWarm() {
+        Assert.assertEquals(0.44444445f, BlurHashDecoderOld.aspectRatio(warmHex)!!, 0.001f)
+        Assert.assertEquals(0.44444445f, BlurHashDecoder.aspectRatio(warmHex)!!, 0.001f)
+    }
+
+    @Test
+    fun testDecoderWarm() {
+        val aspectRatio = BlurHashDecoder.aspectRatio(warmHex) ?: 1.0f
+
+        val bmp1 = BlurHashDecoderOld.decode(warmHex, 100, (100 * (1 / aspectRatio)).roundToInt())
+        val bmp2 = BlurHashDecoder.decodeKeepAspectRatio(warmHex, 100)
+
+        assertTrue(bmp1!!.sameAs(bmp2!!))
+    }
+
+    @Test
+    fun testAspectRatioTest() {
+        Assert.assertEquals(1.0f, BlurHashDecoderOld.aspectRatio(testHex)!!)
+        Assert.assertEquals(1.0f, BlurHashDecoder.aspectRatio(testHex)!!)
+    }
+
+    @Test
+    fun testDecoderTest() {
+        val aspectRatio = BlurHashDecoder.aspectRatio(testHex) ?: 1.0f
+
+        val bmp1 = BlurHashDecoderOld.decode(testHex, 100, (100 * (1 / aspectRatio)).roundToInt())
+        val bmp2 = BlurHashDecoder.decodeKeepAspectRatio(testHex, 100)
+
+        assertTrue(bmp1!!.sameAs(bmp2!!))
+    }
+}