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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.geometry.Offset
import org.jetbrains.skia.GradientStyle
actual typealias Shader = org.jetbrains.skia.Shader
internal actual fun ActualLinearGradientShader(
from: Offset,
to: Offset,
colors: List,
colorStops: List?,
tileMode: TileMode
): Shader {
validateColorStops(colors, colorStops)
return Shader.makeLinearGradient(
from.x, from.y, to.x, to.y, colors.toIntArray(), colorStops?.toFloatArray(),
GradientStyle(tileMode.toSkiaTileMode(), true, identityMatrix33())
)
}
internal actual fun ActualRadialGradientShader(
center: Offset,
radius: Float,
colors: List,
colorStops: List?,
tileMode: TileMode
): Shader {
validateColorStops(colors, colorStops)
return Shader.makeRadialGradient(
center.x,
center.y,
radius,
colors.toIntArray(),
colorStops?.toFloatArray(),
GradientStyle(tileMode.toSkiaTileMode(), true, identityMatrix33())
)
}
internal actual fun ActualSweepGradientShader(
center: Offset,
colors: List,
colorStops: List?
): Shader {
validateColorStops(colors, colorStops)
return Shader.makeSweepGradient(
center.x,
center.y,
colors.toIntArray(),
colorStops?.toFloatArray()
)
}
internal actual fun ActualImageShader(
image: ImageBitmap,
tileModeX: TileMode,
tileModeY: TileMode
): Shader {
return image.asSkiaBitmap().makeShader(
tileModeX.toSkiaTileMode(),
tileModeY.toSkiaTileMode()
)
}
private fun List.toIntArray(): IntArray =
IntArray(size) { i -> this[i].toArgb() }
private fun validateColorStops(colors: List, colorStops: List?) {
if (colorStops == null) {
if (colors.size < 2) {
throw IllegalArgumentException(
"colors must have length of at least 2 if colorStops " +
"is omitted."
)
}
} else if (colors.size != colorStops.size) {
throw IllegalArgumentException(
"colors and colorStops arguments must have" +
" equal length."
)
}
}
