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 17 package android.filterpacks.imageproc; 18 19 import android.filterfw.core.FilterContext; 20 import android.filterfw.core.Program; 21 import android.filterfw.core.ShaderProgram; 22 23 /** 24 * The filter linearly blends "left" and "right" frames. The blending weight is 25 * the multiplication of parameter "blend" and the alpha value in "right" frame. 26 * @hide 27 */ 28 public class BlendFilter extends ImageCombineFilter { 29 30 private final String mBlendShader = 31 "precision mediump float;\n" + 32 "uniform sampler2D tex_sampler_0;\n" + 33 "uniform sampler2D tex_sampler_1;\n" + 34 "uniform float blend;\n" + 35 "varying vec2 v_texcoord;\n" + 36 "void main() {\n" + 37 " vec4 colorL = texture2D(tex_sampler_0, v_texcoord);\n" + 38 " vec4 colorR = texture2D(tex_sampler_1, v_texcoord);\n" + 39 " float weight = colorR.a * blend;\n" + 40 " gl_FragColor = mix(colorL, colorR, weight);\n" + 41 "}\n"; 42 43 public BlendFilter(String name) { 44 super(name, new String[] { "left", "right" }, "blended", "blend"); 45 } 46 47 @Override 48 protected Program getNativeProgram(FilterContext context) { 49 throw new RuntimeException("TODO: Write native implementation for Blend!"); 50 } 51 52 @Override 53 protected Program getShaderProgram(FilterContext context) { 54 return new ShaderProgram(context, mBlendShader); 55 } 56 } 57
