| /* |
| * Copyright (C) 2008 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 android.graphics; |
| |
| |
| |
| /** |
| * Shader is the based class for objects that return horizontal spans of colors |
| * during drawing. A subclass of Shader is installed in a Paint calling |
| * paint.setShader(shader). After that any object (other than a bitmap) that is |
| * drawn with that paint will get its color(s) from the shader. |
| */ |
| public abstract class Shader { |
| |
| private final Matrix mMatrix = new Matrix(); |
| |
| public enum TileMode { |
| /** |
| * replicate the edge color if the shader draws outside of its |
| * original bounds |
| */ |
| CLAMP (0), |
| /** |
| * repeat the shader's image horizontally and vertically |
| */ |
| REPEAT (1), |
| /** |
| * repeat the shader's image horizontally and vertically, alternating |
| * mirror images so that adjacent images always seam |
| */ |
| MIRROR (2); |
| |
| TileMode(int nativeInt) { |
| this.nativeInt = nativeInt; |
| } |
| final int nativeInt; |
| } |
| |
| /** |
| * Return true if the shader has a non-identity local matrix. |
| * @param localM If not null, it is set to the shader's local matrix. |
| * @return true if the shader has a non-identity local matrix |
| */ |
| public boolean getLocalMatrix(Matrix localM) { |
| if (localM != null) { |
| localM.set(mMatrix); |
| } |
| |
| return !mMatrix.isIdentity(); |
| } |
| |
| /** |
| * Set the shader's local matrix. Passing null will reset the shader's |
| * matrix to identity |
| * @param localM The shader's new local matrix, or null to specify identity |
| */ |
| public void setLocalMatrix(Matrix localM) { |
| if (localM != null) { |
| mMatrix.set(localM); |
| } else { |
| mMatrix.reset(); |
| } |
| } |
| |
| abstract java.awt.Paint getPaint(); |
| } |