61 lines
2.3 KiB
Java
61 lines
2.3 KiB
Java
/*
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* Copyright (C) 2008 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 android.graphics;
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/**
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* AvoidXfermode xfermode will draw the src everywhere except on top of the
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* opColor or, depending on the Mode, draw only on top of the opColor.
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*/
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public class AvoidXfermode extends Xfermode {
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// these need to match the enum in SkAvoidXfermode.h on the native side
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public enum Mode {
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AVOID (0), //!< draw everywhere except on the opColor
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TARGET (1); //!< draw only on top of the opColor
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Mode(int nativeInt) {
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this.nativeInt = nativeInt;
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}
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final int nativeInt;
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}
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/** This xfermode draws, or doesn't draw, based on the destination's
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* distance from an op-color.
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*
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* There are two modes, and each mode interprets a tolerance value.
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*
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* Avoid: In this mode, drawing is allowed only on destination pixels that
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* are different from the op-color.
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* Tolerance near 0: avoid any colors even remotely similar to the op-color
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* Tolerance near 255: avoid only colors nearly identical to the op-color
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* Target: In this mode, drawing only occurs on destination pixels that
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* are similar to the op-color
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* Tolerance near 0: draw only on colors that are nearly identical to the op-color
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* Tolerance near 255: draw on any colors even remotely similar to the op-color
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*/
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public AvoidXfermode(int opColor, int tolerance, Mode mode) {
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if (tolerance < 0 || tolerance > 255) {
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throw new IllegalArgumentException("tolerance must be 0..255");
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}
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native_instance = nativeCreate(opColor, tolerance, mode.nativeInt);
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}
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private static native int nativeCreate(int opColor, int tolerance,
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int nativeMode);
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}
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