CanvasUtils.android.kt
/*
* Copyright 2020 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package androidx.compose.ui.graphics
import android.annotation.SuppressLint
import android.graphics.Canvas
import android.os.Build
import androidx.annotation.DoNotInline
import androidx.annotation.RequiresApi
import java.lang.reflect.InvocationTargetException
import java.lang.reflect.Method
internal object CanvasUtils {
private var reorderBarrierMethod: Method? = null
private var inorderBarrierMethod: Method? = null
private var orderMethodsFetched = false
/**
* Enables Z support for the Canvas.
*
* This is only supported on Lollipop and later.
*/
@SuppressLint("SoonBlockedPrivateApi")
fun enableZ(canvas: Canvas, enable: Boolean) {
if (Build.VERSION.SDK_INT >= 29) {
CanvasZHelper.enableZ(canvas, enable)
} else {
if (!orderMethodsFetched) {
try {
if (Build.VERSION.SDK_INT == Build.VERSION_CODES.P) {
// use double reflection to avoid grey list on P
val getDeclaredMethod = Class::class.java.getDeclaredMethod(
"getDeclaredMethod",
String::class.java,
arrayOf<Class<*>>()::class.java
)
reorderBarrierMethod = getDeclaredMethod.invoke(
Canvas::class.java,
"insertReorderBarrier",
emptyArray<Class<*>>()
) as Method?
inorderBarrierMethod = getDeclaredMethod.invoke(
Canvas::class.java,
"insertInorderBarrier",
emptyArray<Class<*>>()
) as Method?
} else {
reorderBarrierMethod = Canvas::class.java.getDeclaredMethod(
"insertReorderBarrier"
)
inorderBarrierMethod = Canvas::class.java.getDeclaredMethod(
"insertInorderBarrier"
)
}
reorderBarrierMethod?.isAccessible = true
inorderBarrierMethod?.isAccessible = true
} catch (ignore: IllegalAccessException) { // Do nothing
} catch (ignore: InvocationTargetException) { // Do nothing
} catch (ignore: NoSuchMethodException) { // Do nothing
}
orderMethodsFetched = true
}
try {
if (enable && reorderBarrierMethod != null) {
reorderBarrierMethod!!.invoke(canvas)
}
if (!enable && inorderBarrierMethod != null) {
inorderBarrierMethod!!.invoke(canvas)
}
} catch (ignore: IllegalAccessException) { // Do nothing
} catch (ignore: InvocationTargetException) { // Do nothing
}
}
}
}
@RequiresApi(29)
private object CanvasZHelper {
@DoNotInline
fun enableZ(canvas: Canvas, enable: Boolean) {
if (enable) {
canvas.enableZ()
} else {
canvas.disableZ()
}
}
}