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/*
* 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.InternalComposeUiApi
import kotlin.math.abs
import org.jetbrains.skia.Matrix33
internal fun identityMatrix33() = Matrix33(
1f, 0f, 0f,
0f, 1f, 0f,
0f, 0f, 1f
)
@InternalComposeUiApi
fun prepareTransformationMatrix(
matrix: Matrix,
pivotX: Float,
pivotY: Float,
translationX: Float,
translationY: Float,
rotationX: Float,
rotationY: Float,
rotationZ: Float,
scaleX: Float,
scaleY: Float,
cameraDistance: Float,
) {
matrix.reset()
matrix.translate(x = -pivotX, y = -pivotY)
matrix *= Matrix().apply {
rotateZ(rotationZ)
rotateY(rotationY)
rotateX(rotationX)
scale(scaleX, scaleY)
}
// Perspective transform should be applied only in case of rotations to avoid
// multiply application in hierarchies.
// See Android's frameworks/base/libs/hwui/RenderProperties.cpp for reference
if (!rotationX.isZero() || !rotationY.isZero()) {
matrix *= Matrix().apply {
// The camera location is passed in inches, set in pt
val depth = cameraDistance * 72f
this[2, 3] = -1f / depth
}
}
matrix *= Matrix().apply {
translate(x = pivotX + translationX, y = pivotY + translationY)
}
// Third column and row are irrelevant for 2D space.
// Zeroing required to get correct inverse transformation matrix.
matrix[2, 0] = 0f
matrix[2, 1] = 0f
matrix[2, 3] = 0f
matrix[0, 2] = 0f
matrix[1, 2] = 0f
matrix[3, 2] = 0f
}
// Copy from Android's frameworks/base/libs/hwui/utils/MathUtils.h
private const val NON_ZERO_EPSILON = 0.001f
private inline fun Float.isZero(): Boolean = abs(this) <= NON_ZERO_EPSILON
