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skikoMain.androidx.compose.ui.graphics.SkiaBackedPath.skiko.kt Maven / Gradle / Ivy
/*
* 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 androidx.compose.ui.geometry.Offset
import androidx.compose.ui.geometry.Rect
import androidx.compose.ui.geometry.RoundRect
import org.jetbrains.skia.Matrix33
import org.jetbrains.skia.PathDirection
import org.jetbrains.skia.PathFillMode
import org.jetbrains.skia.PathOp
actual fun Path(): Path = SkiaBackedPath()
/**
* Convert the [org.jetbrains.skia.Path] instance into a Compose-compatible Path
*/
fun org.jetbrains.skia.Path.asComposePath(): Path = SkiaBackedPath(this)
/**
* Obtain a reference to the [org.jetbrains.skia.Path]
*
* @Throws UnsupportedOperationException if this Path is not backed by an org.jetbrains.skia.Path
*/
fun Path.asSkiaPath(): org.jetbrains.skia.Path =
if (this is SkiaBackedPath) {
internalPath
} else {
throw UnsupportedOperationException("Unable to obtain org.jetbrains.skia.Path")
}
@Suppress("OVERRIDE_DEPRECATION")
internal class SkiaBackedPath(
internalPath: org.jetbrains.skia.Path = org.jetbrains.skia.Path()
) : Path {
var internalPath = internalPath
private set
override var fillType: PathFillType
get() {
return if (internalPath.fillMode == PathFillMode.EVEN_ODD) {
PathFillType.EvenOdd
} else {
PathFillType.NonZero
}
}
set(value) {
internalPath.fillMode =
if (value == PathFillType.EvenOdd) {
PathFillMode.EVEN_ODD
} else {
PathFillMode.WINDING
}
}
override fun moveTo(x: Float, y: Float) {
internalPath.moveTo(x, y)
}
override fun relativeMoveTo(dx: Float, dy: Float) {
internalPath.rMoveTo(dx, dy)
}
override fun lineTo(x: Float, y: Float) {
internalPath.lineTo(x, y)
}
override fun relativeLineTo(dx: Float, dy: Float) {
internalPath.rLineTo(dx, dy)
}
override fun quadraticBezierTo(x1: Float, y1: Float, x2: Float, y2: Float) {
internalPath.quadTo(x1, y1, x2, y2)
}
override fun quadraticTo(x1: Float, y1: Float, x2: Float, y2: Float) {
internalPath.quadTo(x1, y1, x2, y2)
}
override fun relativeQuadraticBezierTo(dx1: Float, dy1: Float, dx2: Float, dy2: Float) {
internalPath.rQuadTo(dx1, dy1, dx2, dy2)
}
override fun relativeQuadraticTo(dx1: Float, dy1: Float, dx2: Float, dy2: Float) {
internalPath.rQuadTo(dx1, dy1, dx2, dy2)
}
override fun cubicTo(x1: Float, y1: Float, x2: Float, y2: Float, x3: Float, y3: Float) {
internalPath.cubicTo(
x1, y1,
x2, y2,
x3, y3
)
}
override fun relativeCubicTo(
dx1: Float,
dy1: Float,
dx2: Float,
dy2: Float,
dx3: Float,
dy3: Float
) {
internalPath.rCubicTo(
dx1, dy1,
dx2, dy2,
dx3, dy3
)
}
override fun arcTo(
rect: Rect,
startAngleDegrees: Float,
sweepAngleDegrees: Float,
forceMoveTo: Boolean
) {
internalPath.arcTo(
rect.toSkiaRect(),
startAngleDegrees,
sweepAngleDegrees,
forceMoveTo
)
}
override fun addRect(rect: Rect) {
internalPath.addRect(rect.toSkiaRect(), PathDirection.COUNTER_CLOCKWISE)
}
override fun addRect(rect: Rect, direction: Path.Direction) {
internalPath.addRect(rect.toSkiaRect(), direction.toSkiaPathDirection())
}
override fun addOval(oval: Rect) {
internalPath.addOval(oval.toSkiaRect(), PathDirection.COUNTER_CLOCKWISE)
}
override fun addOval(oval: Rect, direction: Path.Direction) {
internalPath.addOval(oval.toSkiaRect(), direction.toSkiaPathDirection())
}
override fun addRoundRect(roundRect: RoundRect) {
internalPath.addRRect(roundRect.toSkiaRRect(), PathDirection.COUNTER_CLOCKWISE)
}
override fun addRoundRect(roundRect: RoundRect, direction: Path.Direction) {
internalPath.addRRect(roundRect.toSkiaRRect(), direction.toSkiaPathDirection())
}
override fun addArcRad(oval: Rect, startAngleRadians: Float, sweepAngleRadians: Float) {
addArc(oval, degrees(startAngleRadians), degrees(sweepAngleRadians))
}
override fun addArc(oval: Rect, startAngleDegrees: Float, sweepAngleDegrees: Float) {
internalPath.addArc(oval.toSkiaRect(), startAngleDegrees, sweepAngleDegrees)
}
override fun addPath(path: Path, offset: Offset) {
internalPath.addPath(path.asSkiaPath(), offset.x, offset.y)
}
override fun close() {
internalPath.closePath()
}
override fun reset() {
// preserve fillType to match the Android behavior
// see https://cs.android.com/android/_/android/platform/frameworks/base/+/d0f379c1976c600313f1f4c39f2587a649e3a4fc
val fillType = this.fillType
internalPath.reset()
this.fillType = fillType
}
override fun rewind() {
internalPath.rewind()
}
override fun translate(offset: Offset) {
internalPath.transform(Matrix33.makeTranslate(offset.x, offset.y))
}
override fun transform(matrix: Matrix) {
internalPath.transform(Matrix33.makeTranslate(0f, 0f).apply { setFrom(matrix) })
}
override fun getBounds(): Rect {
val bounds = internalPath.bounds
return Rect(
bounds.left,
bounds.top,
bounds.right,
bounds.bottom
)
}
override fun op(
path1: Path,
path2: Path,
operation: PathOperation
): Boolean {
val path = org.jetbrains.skia.Path.makeCombining(
path1.asSkiaPath(),
path2.asSkiaPath(),
operation.toSkiaOperation()
)
internalPath = path ?: internalPath
return path != null
}
private fun PathOperation.toSkiaOperation() = when (this) {
PathOperation.Difference -> PathOp.DIFFERENCE
PathOperation.Intersect -> PathOp.INTERSECT
PathOperation.Union -> PathOp.UNION
PathOperation.Xor -> PathOp.XOR
PathOperation.ReverseDifference -> PathOp.REVERSE_DIFFERENCE
else -> PathOp.XOR
}
override val isConvex: Boolean get() = internalPath.isConvex
override val isEmpty: Boolean get() = internalPath.isEmpty
private fun Matrix33.setFrom(matrix: Matrix) {
require(
matrix[0, 2] == 0f &&
matrix[1, 2] == 0f &&
matrix[2, 2] == 1f &&
matrix[3, 2] == 0f &&
matrix[2, 0] == 0f &&
matrix[2, 1] == 0f &&
matrix[2, 3] == 0f
) {
"Matrix33 does not support arbitrary transforms"
}
// We'll reuse the array used in Matrix to avoid allocation by temporarily
// setting it to the 3x3 matrix used by android.graphics.Matrix
// Store the values of the 4 x 4 matrix into temporary variables
// to be reset after the 3 x 3 matrix is configured
val scaleX = matrix.values[Matrix.ScaleX] // 0
val skewY = matrix.values[Matrix.SkewY] // 1
val v2 = matrix.values[2] // 2
val persp0 = matrix.values[Matrix.Perspective0] // 3
val skewX = matrix.values[Matrix.SkewX] // 4
val scaleY = matrix.values[Matrix.ScaleY] // 5
val v6 = matrix.values[6] // 6
val persp1 = matrix.values[Matrix.Perspective1] // 7
val v8 = matrix.values[8] // 8
val translateX = matrix.values[Matrix.TranslateX]
val translateY = matrix.values[Matrix.TranslateY]
val persp2 = matrix.values[Matrix.Perspective2]
val v = matrix.values
v[0] = scaleX // MSCALE_X = 0
v[1] = skewX // MSKEW_X = 1
v[2] = translateX // MTRANS_X = 2
v[3] = skewY // MSKEW_Y = 3
v[4] = scaleY // MSCALE_Y = 4
v[5] = translateY // MTRANS_Y
v[6] = persp0 // MPERSP_0 = 6
v[7] = persp1 // MPERSP_1 = 7
v[8] = persp2 // MPERSP_2 = 8
for (i in 0..8) {
mat[i] = v[i]
}
// Reset the values back after the android.graphics.Matrix is configured
v[Matrix.ScaleX] = scaleX // 0
v[Matrix.SkewY] = skewY // 1
v[2] = v2 // 2
v[Matrix.Perspective0] = persp0 // 3
v[Matrix.SkewX] = skewX // 4
v[Matrix.ScaleY] = scaleY // 5
v[6] = v6 // 6
v[Matrix.Perspective1] = persp1 // 7
v[8] = v8 // 8
}
}
private fun Path.Direction.toSkiaPathDirection() = when (this) {
Path.Direction.CounterClockwise -> PathDirection.COUNTER_CLOCKWISE
Path.Direction.Clockwise -> PathDirection.CLOCKWISE
}
