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.KeyValueMap; 25import android.filterfw.core.NativeProgram; 26import android.filterfw.core.NativeFrame; 27import android.filterfw.core.Program; 28import android.filterfw.core.ShaderProgram; 29import android.filterfw.format.ImageFormat; 30 31public class PosterizeFilter extends Filter { 32 33 @GenerateFieldPort(name = "tile_size", hasDefault = true) 34 private int mTileSize = 640; 35 36 private Program mProgram; 37 private int mTarget = FrameFormat.TARGET_UNSPECIFIED; 38 39 private final String mPosterizeShader = 40 "precision mediump float;\n" + 41 "uniform sampler2D tex_sampler_0;\n" + 42 "varying vec2 v_texcoord;\n" + 43 "void main() {\n" + 44 " vec4 color = texture2D(tex_sampler_0, v_texcoord);\n" + 45 " vec3 pcolor;\n" + 46 " pcolor.r = (color.r >= 0.5) ? 0.75 : 0.25;\n" + 47 " pcolor.g = (color.g >= 0.5) ? 0.75 : 0.25;\n" + 48 " pcolor.b = (color.b >= 0.5) ? 0.75 : 0.25;\n" + 49 " gl_FragColor = vec4(pcolor, color.a);\n" + 50 "}\n"; 51 52 public PosterizeFilter(String name) { 53 super(name); 54 } 55 56 @Override 57 public void setupPorts() { 58 addMaskedInputPort("image", ImageFormat.create(ImageFormat.COLORSPACE_RGBA)); 59 addOutputBasedOnInput("image", "image"); 60 } 61 62 @Override 63 public FrameFormat getOutputFormat(String portName, FrameFormat inputFormat) { 64 return inputFormat; 65 } 66 67 public void initProgram(FilterContext context, int target) { 68 switch (target) { 69 case FrameFormat.TARGET_GPU: 70 ShaderProgram shaderProgram = new ShaderProgram(context, mPosterizeShader); 71 shaderProgram.setMaximumTileSize(mTileSize); 72 mProgram = shaderProgram; 73 break; 74 75 default: 76 throw new RuntimeException("Filter Sharpen does not support frames of " + 77 "target " + target + "!"); 78 } 79 mTarget = target; 80 } 81 82 @Override 83 public void process(FilterContext context) { 84 // Get input frame 85 Frame input = pullInput("image"); 86 FrameFormat inputFormat = input.getFormat(); 87 88 // Create output frame 89 Frame output = context.getFrameManager().newFrame(inputFormat); 90 91 // Create program if not created already 92 if (mProgram == null || inputFormat.getTarget() != mTarget) { 93 initProgram(context, inputFormat.getTarget()); 94 } 95 96 // Process 97 mProgram.process(input, output); 98 99 // Push output 100 pushOutput("image", output); 101 102 // Release pushed frame 103 output.release(); 104 } 105 106} 107