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.GenerateFieldPort; 24import android.filterfw.core.Program; 25import android.filterfw.core.ShaderProgram; 26import android.filterfw.format.ImageFormat; 27 28 29public class NegativeFilter extends Filter { 30 31 @GenerateFieldPort(name = "tile_size", hasDefault = true) 32 private int mTileSize = 640; 33 34 private Program mProgram; 35 private int mTarget = FrameFormat.TARGET_UNSPECIFIED; 36 37 private final String mNegativeShader = 38 "precision mediump float;\n" + 39 "uniform sampler2D tex_sampler_0;\n" + 40 "varying vec2 v_texcoord;\n" + 41 "void main() {\n" + 42 " vec4 color = texture2D(tex_sampler_0, v_texcoord);\n" + 43 " gl_FragColor = vec4(1.0 - color.rgb, color.a);\n" + 44 "}\n"; 45 46 public NegativeFilter(String name) { 47 super(name); 48 } 49 50 @Override 51 public void setupPorts() { 52 addMaskedInputPort("image", ImageFormat.create(ImageFormat.COLORSPACE_RGBA)); 53 addOutputBasedOnInput("image", "image"); 54 } 55 56 @Override 57 public FrameFormat getOutputFormat(String portName, FrameFormat inputFormat) { 58 return inputFormat; 59 } 60 61 public void initProgram(FilterContext context, int target) { 62 switch (target) { 63 case FrameFormat.TARGET_GPU: 64 ShaderProgram shaderProgram = new ShaderProgram(context, mNegativeShader); 65 shaderProgram.setMaximumTileSize(mTileSize); 66 mProgram = shaderProgram; 67 break; 68 69 default: 70 throw new RuntimeException("Filter Sharpen does not support frames of " + 71 "target " + target + "!"); 72 } 73 mTarget = target; 74 } 75 76 @Override 77 public void process(FilterContext context) { 78 // Get input frame 79 Frame input = pullInput("image"); 80 FrameFormat inputFormat = input.getFormat(); 81 82 // Create output frame 83 Frame output = context.getFrameManager().newFrame(inputFormat); 84 85 // Create program if not created already 86 if (mProgram == null || inputFormat.getTarget() != mTarget) { 87 initProgram(context, inputFormat.getTarget()); 88 } 89 90 // Process 91 mProgram.process(input, output); 92 93 // Push output 94 pushOutput("image", output); 95 96 // Release pushed frame 97 output.release(); 98 } 99 100} 101