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 31import java.util.Random; 32 33public class BlackWhiteFilter extends Filter { 34 35 @GenerateFieldPort(name = "black", hasDefault = true) 36 private float mBlack = 0f; 37 38 @GenerateFieldPort(name = "white", hasDefault = true) 39 private float mWhite = 1f; 40 41 @GenerateFieldPort(name = "tile_size", hasDefault = true) 42 private int mTileSize = 640; 43 44 private Program mProgram; 45 46 private int mWidth = 0; 47 private int mHeight = 0; 48 private int mTarget = FrameFormat.TARGET_UNSPECIFIED; 49 50 private Frame mNoiseFrame = null; 51 private Random mRandom; 52 53 private final String mBlackWhiteShader = 54 "precision mediump float;\n" + 55 "uniform sampler2D tex_sampler_0;\n" + 56 "uniform sampler2D tex_sampler_1;\n" + 57 "uniform float black;\n" + 58 "uniform float scale;\n" + 59 "uniform float stepsize;\n" + 60 "varying vec2 v_texcoord;\n" + 61 "void main() {\n" + 62 " vec4 color = texture2D(tex_sampler_0, v_texcoord);\n" + 63 " float dither = texture2D(tex_sampler_1, v_texcoord).r;\n" + 64 " vec3 xform = clamp((color.rgb - black) * scale, 0.0, 1.0);\n" + 65 " vec3 temp = clamp((color.rgb + stepsize - black) * scale, 0.0, 1.0);\n" + 66 " vec3 new_color = clamp(xform + (temp - xform) * (dither - 0.5), 0.0, 1.0);\n" + 67 " gl_FragColor = vec4(new_color, color.a);\n" + 68 "}\n"; 69 70 public BlackWhiteFilter(String name) { 71 super(name); 72 73 mRandom = new Random(); 74 } 75 76 @Override 77 public void setupPorts() { 78 addMaskedInputPort("image", ImageFormat.create(ImageFormat.COLORSPACE_RGBA)); 79 addOutputBasedOnInput("image", "image"); 80 } 81 82 @Override 83 public FrameFormat getOutputFormat(String portName, FrameFormat inputFormat) { 84 return inputFormat; 85 } 86 87 @Override 88 public void tearDown(FilterContext context) { 89 if (mNoiseFrame != null) { 90 mNoiseFrame.release(); 91 mNoiseFrame = null; 92 } 93 } 94 95 public void initProgram(FilterContext context, int target) { 96 switch (target) { 97 case FrameFormat.TARGET_GPU: 98 ShaderProgram shaderProgram = new ShaderProgram(context, mBlackWhiteShader); 99 shaderProgram.setMaximumTileSize(mTileSize); 100 mProgram = shaderProgram; 101 updateParameters(); 102 break; 103 104 default: 105 throw new RuntimeException("Filter Sharpen does not support frames of " + 106 "target " + target + "!"); 107 } 108 mTarget = target; 109 } 110 111 private void updateParameters() { 112 float scale = (mBlack != mWhite) ? 1.0f / (mWhite - mBlack) : 2000f; 113 float stepsize = 1.0f / 255.0f; 114 115 mProgram.setHostValue("black", mBlack); 116 mProgram.setHostValue("scale", scale); 117 mProgram.setHostValue("stepsize", stepsize); 118 } 119 120 @Override 121 public void fieldPortValueUpdated(String name, FilterContext context) { 122 if (mProgram != null) { 123 updateParameters(); 124 } 125 } 126 127 @Override 128 public void process(FilterContext context) { 129 // Get input frame 130 Frame input = pullInput("image"); 131 FrameFormat inputFormat = input.getFormat(); 132 133 // Create program if not created already 134 if (mProgram == null || inputFormat.getTarget() != mTarget) { 135 initProgram(context, inputFormat.getTarget()); 136 } 137 138 // Check if the frame size has changed 139 if (inputFormat.getWidth() != mWidth || inputFormat.getHeight() != mHeight) { 140 mWidth = inputFormat.getWidth(); 141 mHeight = inputFormat.getHeight(); 142 143 if (mNoiseFrame != null) { 144 mNoiseFrame.release(); 145 } 146 147 int[] buffer = new int[mWidth * mHeight]; 148 for (int i = 0; i < mWidth * mHeight; ++i) { 149 buffer[i] = mRandom.nextInt(255); 150 } 151 FrameFormat format = ImageFormat.create(mWidth, mHeight, 152 ImageFormat.COLORSPACE_RGBA, 153 FrameFormat.TARGET_GPU); 154 mNoiseFrame = context.getFrameManager().newFrame(format); 155 mNoiseFrame.setInts(buffer); 156 } 157 158 if (mNoiseFrame != null && (mNoiseFrame.getFormat().getWidth() != mWidth || 159 mNoiseFrame.getFormat().getHeight() != mHeight)) { 160 throw new RuntimeException("Random map and imput image size mismatch!"); 161 } 162 163 // Create output frame 164 Frame output = context.getFrameManager().newFrame(inputFormat); 165 166 // Process 167 Frame[] inputs = {input, mNoiseFrame}; 168 mProgram.process(inputs, output); 169 170 // Push output 171 pushOutput("image", output); 172 173 // Release pushed frame 174 output.release(); 175 } 176} 177