| /* |
| * 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.platform |
| |
| import androidx.compose.ui.graphics.Outline |
| import androidx.compose.ui.graphics.Shape |
| import androidx.compose.ui.unit.Density |
| import androidx.compose.ui.unit.LayoutDirection |
| import androidx.compose.ui.unit.IntSize |
| import androidx.compose.ui.unit.toSize |
| |
| /** |
| * Class for storing outline. Recalculates outline when [size] or [shape] is changed. |
| * It' s needed so we don't have to recreate it every time we use it for rendering |
| * (it can be expensive to create outline every frame). |
| */ |
| internal class OutlineCache( |
| density: Density, |
| size: IntSize, |
| shape: Shape, |
| layoutDirection: LayoutDirection |
| ) { |
| var density = density |
| set(value) { |
| if (value != field) { |
| field = value |
| update() |
| } |
| } |
| |
| var size = size |
| set(value) { |
| if (value != field) { |
| field = value |
| update() |
| } |
| } |
| |
| var shape = shape |
| set(value) { |
| if (value != field) { |
| field = value |
| update() |
| } |
| } |
| |
| var layoutDirection = layoutDirection |
| set(value) { |
| if (value != field) { |
| field = value |
| update() |
| } |
| } |
| |
| var outline: Outline? = null |
| private set |
| |
| private fun update() { |
| outline = if (size != IntSize.Zero) { |
| val floatSize = size.toSize() |
| shape.createOutline(floatSize, layoutDirection, density) |
| } else { |
| null |
| } |
| } |
| } |
