Merge branch 'devel' into feature/nextgen

app/src/main/java/org/koitharu/kotatsu/utils/image/CoverSizeResolver.kt

@@ -0,0 +1,83 @@
+package org.koitharu.kotatsu.utils.image
+
+import android.view.View
+import android.view.View.OnLayoutChangeListener
+import android.view.ViewGroup
+import android.widget.ImageView
+import coil.size.Dimension
+import coil.size.Size
+import coil.size.SizeResolver
+import kotlin.coroutines.resume
+import kotlin.math.roundToInt
+import kotlinx.coroutines.CancellableContinuation
+import kotlinx.coroutines.suspendCancellableCoroutine
+
+private const val ASPECT_RATIO_HEIGHT = 18f
+private const val ASPECT_RATIO_WIDTH = 13f
+
+class CoverSizeResolver(
+	private val imageView: ImageView,
+) : SizeResolver {
+
+	override suspend fun size(): Size {
+		getSize()?.let { return it }
+		return suspendCancellableCoroutine { cont ->
+			val layoutListener = LayoutListener(cont)
+			imageView.addOnLayoutChangeListener(layoutListener)
+			cont.invokeOnCancellation {
+				imageView.removeOnLayoutChangeListener(layoutListener)
+			}
+		}
+	}
+
+	private fun getSize(): Size? {
+		val lp = imageView.layoutParams
+		var width = getDimension(lp.width, imageView.width, imageView.paddingLeft + imageView.paddingRight)
+		var height = getDimension(lp.height, imageView.height, imageView.paddingTop + imageView.paddingBottom)
+		if (width == null && height == null) {
+			return null
+		}
+		if (height == null && width != null) {
+			height = Dimension((width.px * ASPECT_RATIO_HEIGHT / ASPECT_RATIO_WIDTH).roundToInt())
+		} else if (width == null && height != null) {
+			width = Dimension((height.px * ASPECT_RATIO_WIDTH / ASPECT_RATIO_HEIGHT).roundToInt())
+		}
+		return Size(checkNotNull(width), checkNotNull(height))
+	}
+
+	private fun getDimension(paramSize: Int, viewSize: Int, paddingSize: Int): Dimension.Pixels? {
+		if (paramSize == ViewGroup.LayoutParams.WRAP_CONTENT) {
+			return null
+		}
+		val insetParamSize = paramSize - paddingSize
+		if (insetParamSize > 0) {
+			return Dimension(insetParamSize)
+		}
+		val insetViewSize = viewSize - paddingSize
+		if (insetViewSize > 0) {
+			return Dimension(insetViewSize)
+		}
+		return null
+	}
+
+	private inner class LayoutListener(
+		private val continuation: CancellableContinuation<Size>,
+	) : OnLayoutChangeListener {
+
+		override fun onLayoutChange(
+			v: View,
+			left: Int,
+			top: Int,
+			right: Int,
+			bottom: Int,
+			oldLeft: Int,
+			oldTop: Int,
+			oldRight: Int,
+			oldBottom: Int,
+		) {
+			val size = getSize() ?: return
+			v.removeOnLayoutChangeListener(this)
+			continuation.resume(size)
+		}
+	}
+}

app/src/main/java/org/koitharu/kotatsu/utils/image/TrimTransformation.kt

@@ -1,11 +1,15 @@
 package org.koitharu.kotatsu.utils.image
 
 import android.graphics.Bitmap
-import androidx.core.graphics.get
+import androidx.annotation.ColorInt
+import androidx.core.graphics.*
 import coil.size.Size
 import coil.transform.Transformation
+import kotlin.math.abs
 
-class TrimTransformation : Transformation {
+class TrimTransformation(
+	private val tolerance: Int = 20,
+) : Transformation {
 
 	override val cacheKey: String = javaClass.name
 
@@ -20,7 +24,7 @@ class TrimTransformation : Transformation {
 			var isColBlank = true
 			val prevColor = input[x, 0]
 			for (y in 1 until input.height) {
-				if (input[x, y] != prevColor) {
+				if (!isColorTheSame(input[x, y], prevColor)) {
 					isColBlank = false
 					break
 				}
@@ -39,7 +43,7 @@ class TrimTransformation : Transformation {
 			var isColBlank = true
 			val prevColor = input[x, 0]
 			for (y in 1 until input.height) {
-				if (input[x, y] != prevColor) {
+				if (!isColorTheSame(input[x, y], prevColor)) {
 					isColBlank = false
 					break
 				}
@@ -55,7 +59,7 @@ class TrimTransformation : Transformation {
 			var isRowBlank = true
 			val prevColor = input[0, y]
 			for (x in 1 until input.width) {
-				if (input[x, y] != prevColor) {
+				if (!isColorTheSame(input[x, y], prevColor)) {
 					isRowBlank = false
 					break
 				}
@@ -71,7 +75,7 @@ class TrimTransformation : Transformation {
 			var isRowBlank = true
 			val prevColor = input[0, y]
 			for (x in 1 until input.width) {
-				if (input[x, y] != prevColor) {
+				if (!isColorTheSame(input[x, y], prevColor)) {
 					isRowBlank = false
 					break
 				}
@@ -93,4 +97,11 @@ class TrimTransformation : Transformation {
 	override fun equals(other: Any?) = other is TrimTransformation
 
 	override fun hashCode() = javaClass.hashCode()
+
+	private fun isColorTheSame(@ColorInt a: Int, @ColorInt b: Int): Boolean {
+		return abs(a.red - b.red) <= tolerance &&
+			abs(a.green - b.green) <= tolerance &&
+			abs(a.blue - b.blue) <= tolerance &&
+			abs(a.alpha - b.alpha) <= tolerance
+	}
 }