83 lines
3.1 KiB
Kotlin
83 lines
3.1 KiB
Kotlin
/*
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* Copyright (C) 2021 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.example.testapp
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import android.renderscript.toolkit.BlendingMode
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import android.renderscript.toolkit.Range2d
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/**
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* Reference implementation of a Blend operation.
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*
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* See the class Rgba for details of arithmetic operation using that class.
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*/
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@ExperimentalUnsignedTypes
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fun referenceBlend(
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mode: BlendingMode,
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sourceArray: ByteArray,
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destArray: ByteArray,
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sizeX: Int,
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sizeY: Int,
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restriction: Range2d?
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) {
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val source = Rgba2dArray(sourceArray, sizeX, sizeY)
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val dest = Rgba2dArray(destArray, sizeX, sizeY)
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/**
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* For each corresponding RGBA value of the source and destination arrays, invoke the blend
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* function and store the result in the destination array.
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*/
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fun blendEachPair(blendFunction: (src: Rgba, dst: Rgba) -> Rgba) {
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dest.forEachCell(restriction) { x, y ->
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dest[x, y] = blendFunction(source[x, y], dest[x, y])
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}
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}
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when (mode) {
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BlendingMode.CLEAR -> blendEachPair { _, _ -> Rgba(0, 0, 0, 0) }
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BlendingMode.SRC -> blendEachPair { src, _ -> src }
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BlendingMode.DST -> { /* This doesn't do anything. */ }
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BlendingMode.SRC_OVER -> blendEachPair { src, dst -> blendOver(src, dst) }
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BlendingMode.DST_OVER -> blendEachPair { src, dst -> blendOver(dst, src) }
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BlendingMode.SRC_IN -> blendEachPair { src, dst -> blendIn(src, dst) }
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BlendingMode.DST_IN -> blendEachPair { src, dst -> blendIn(dst, src) }
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BlendingMode.SRC_OUT -> blendEachPair { src, dst -> blendOut(src, dst) }
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BlendingMode.DST_OUT -> blendEachPair { src, dst -> blendOut(dst, src) }
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BlendingMode.SRC_ATOP -> blendEachPair { src, dst -> blendAtop(src, dst) }
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BlendingMode.DST_ATOP -> blendEachPair { src, dst -> blendAtop(dst, src) }
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BlendingMode.XOR -> blendEachPair { src, dst -> src xor dst }
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BlendingMode.MULTIPLY -> blendEachPair { src, dst -> src * dst }
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BlendingMode.ADD -> blendEachPair { src, dst -> dst + src }
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BlendingMode.SUBTRACT -> blendEachPair { src, dst -> dst - src }
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}
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}
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@ExperimentalUnsignedTypes
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private fun blendOver(src: Rgba, dst: Rgba) = src + (dst * (255 - src.a))
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@ExperimentalUnsignedTypes
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private fun blendIn(src: Rgba, dst: Rgba) = src * dst.a
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@ExperimentalUnsignedTypes
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private fun blendOut(src: Rgba, dst: Rgba) = src * (255 - dst.a)
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@ExperimentalUnsignedTypes
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private fun blendAtop(src: Rgba, dst: Rgba): Rgba {
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val value = src * dst.a + dst * (255 - src.a)
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value.a = dst.a
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return value
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}
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