1/* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.filterpacks.imageproc; 18 19import android.filterfw.core.Filter; 20import android.filterfw.core.FilterContext; 21import android.filterfw.core.Frame; 22import android.filterfw.core.FrameFormat; 23import android.filterfw.core.KeyValueMap; 24import android.filterfw.core.NativeProgram; 25import android.filterfw.core.NativeFrame; 26import android.filterfw.core.Program; 27import android.filterfw.core.ShaderProgram; 28import android.filterfw.format.ImageFormat; 29 30import java.util.Set; 31 32/** 33 * The filter linearly blends "left" and "right" frames. The blending weight is 34 * the multiplication of parameter "blend" and the alpha value in "right" frame. 35 * @hide 36 */ 37public class BlendFilter extends ImageCombineFilter { 38 39 private final String mBlendShader = 40 "precision mediump float;\n" + 41 "uniform sampler2D tex_sampler_0;\n" + 42 "uniform sampler2D tex_sampler_1;\n" + 43 "uniform float blend;\n" + 44 "varying vec2 v_texcoord;\n" + 45 "void main() {\n" + 46 " vec4 colorL = texture2D(tex_sampler_0, v_texcoord);\n" + 47 " vec4 colorR = texture2D(tex_sampler_1, v_texcoord);\n" + 48 " float weight = colorR.a * blend;\n" + 49 " gl_FragColor = mix(colorL, colorR, weight);\n" + 50 "}\n"; 51 52 public BlendFilter(String name) { 53 super(name, new String[] { "left", "right" }, "blended", "blend"); 54 } 55 56 @Override 57 protected Program getNativeProgram(FilterContext context) { 58 throw new RuntimeException("TODO: Write native implementation for Blend!"); 59 } 60 61 @Override 62 protected Program getShaderProgram(FilterContext context) { 63 return new ShaderProgram(context, mBlendShader); 64 } 65} 66