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 28import java.util.Date; 29import java.util.Random; 30 31public class GrainFilter extends Filter { 32 33 private static final int RAND_THRESHOLD = 128; 34 35 @GenerateFieldPort(name = "strength", hasDefault = true) 36 private float mScale = 0f; 37 38 @GenerateFieldPort(name = "tile_size", hasDefault = true) 39 private int mTileSize = 640; 40 41 private Program mGrainProgram; 42 private Program mNoiseProgram; 43 44 private int mWidth = 0; 45 private int mHeight = 0; 46 private int mTarget = FrameFormat.TARGET_UNSPECIFIED; 47 48 private Random mRandom; 49 50 private final String mNoiseShader = 51 "precision mediump float;\n" + 52 "uniform vec2 seed;\n" + 53 "varying vec2 v_texcoord;\n" + 54 "float rand(vec2 loc) {\n" + 55 " float theta1 = dot(loc, vec2(0.9898, 0.233));\n" + 56 " float theta2 = dot(loc, vec2(12.0, 78.0));\n" + 57 " float value = cos(theta1) * sin(theta2) + sin(theta1) * cos(theta2);\n" + 58 // keep value of part1 in range: (2^-14 to 2^14). 59 " float temp = mod(197.0 * value, 1.0) + value;\n" + 60 " float part1 = mod(220.0 * temp, 1.0) + temp;\n" + 61 " float part2 = value * 0.5453;\n" + 62 " float part3 = cos(theta1 + theta2) * 0.43758;\n" + 63 " return fract(part1 + part2 + part3);\n" + 64 "}\n" + 65 "void main() {\n" + 66 " gl_FragColor = vec4(rand(v_texcoord + seed), 0.0, 0.0, 1.0);\n" + 67 "}\n"; 68 69 private final String mGrainShader = 70 "precision mediump float;\n" + 71 "uniform sampler2D tex_sampler_0;\n" + 72 "uniform sampler2D tex_sampler_1;\n" + 73 "uniform float scale;\n" + 74 "uniform float stepX;\n" + 75 "uniform float stepY;\n" + 76 "varying vec2 v_texcoord;\n" + 77 "void main() {\n" + 78 " float noise = texture2D(tex_sampler_1, v_texcoord + vec2(-stepX, -stepY)).r * 0.224;\n" + 79 " noise += texture2D(tex_sampler_1, v_texcoord + vec2(-stepX, stepY)).r * 0.224;\n" + 80 " noise += texture2D(tex_sampler_1, v_texcoord + vec2(stepX, -stepY)).r * 0.224;\n" + 81 " noise += texture2D(tex_sampler_1, v_texcoord + vec2(stepX, stepY)).r * 0.224;\n" + 82 " noise += 0.4448;\n" + 83 " noise *= scale;\n" + 84 " vec4 color = texture2D(tex_sampler_0, v_texcoord);\n" + 85 " float energy = 0.33333 * color.r + 0.33333 * color.g + 0.33333 * color.b;\n" + 86 " float mask = (1.0 - sqrt(energy));\n" + 87 " float weight = 1.0 - 1.333 * mask * noise;\n" + 88 " gl_FragColor = vec4(color.rgb * weight, color.a);\n" + 89 "}\n"; 90 91 public GrainFilter(String name) { 92 super(name); 93 mRandom = new Random(new Date().getTime()); 94 } 95 96 @Override 97 public void setupPorts() { 98 addMaskedInputPort("image", ImageFormat.create(ImageFormat.COLORSPACE_RGBA)); 99 addOutputBasedOnInput("image", "image"); 100 } 101 102 @Override 103 public FrameFormat getOutputFormat(String portName, FrameFormat inputFormat) { 104 return inputFormat; 105 } 106 107 public void initProgram(FilterContext context, int target) { 108 switch (target) { 109 case FrameFormat.TARGET_GPU: 110 ShaderProgram shaderProgram = new ShaderProgram(context, mNoiseShader); 111 shaderProgram.setMaximumTileSize(mTileSize); 112 mNoiseProgram = shaderProgram; 113 114 shaderProgram = new ShaderProgram(context, mGrainShader); 115 shaderProgram.setMaximumTileSize(mTileSize); 116 mGrainProgram = shaderProgram; 117 break; 118 119 default: 120 throw new RuntimeException("Filter Sharpen does not support frames of " + 121 "target " + target + "!"); 122 } 123 mTarget = target; 124 } 125 126 private void updateParameters() { 127 float seed[] = { mRandom.nextFloat(), mRandom.nextFloat() }; 128 mNoiseProgram.setHostValue("seed", seed); 129 130 mGrainProgram.setHostValue("scale", mScale); 131 } 132 133 private void updateFrameSize(int width, int height) { 134 mWidth = width; 135 mHeight = height; 136 137 if (mGrainProgram != null) { 138 mGrainProgram.setHostValue("stepX", 0.5f / mWidth); 139 mGrainProgram.setHostValue("stepY", 0.5f / mHeight); 140 updateParameters(); 141 } 142 } 143 144 @Override 145 public void fieldPortValueUpdated(String name, FilterContext context) { 146 if (mGrainProgram != null && mNoiseProgram != null) { 147 updateParameters(); 148 } 149 } 150 151 @Override 152 public void process(FilterContext context) { 153 // Get input frame 154 Frame input = pullInput("image"); 155 FrameFormat inputFormat = input.getFormat(); 156 157 FrameFormat noiseFormat = ImageFormat.create(inputFormat.getWidth() / 2, 158 inputFormat.getHeight() / 2, 159 ImageFormat.COLORSPACE_RGBA, 160 FrameFormat.TARGET_GPU); 161 162 // Create noise frame 163 Frame noiseFrame = context.getFrameManager().newFrame(inputFormat); 164 165 // Create output frame 166 Frame output = context.getFrameManager().newFrame(inputFormat); 167 168 // Create program if not created already 169 if (mNoiseProgram == null || mGrainProgram == null || inputFormat.getTarget() != mTarget) { 170 initProgram(context, inputFormat.getTarget()); 171 updateParameters(); 172 } 173 174 // Check if the frame size has changed 175 if (inputFormat.getWidth() != mWidth || inputFormat.getHeight() != mHeight) { 176 updateFrameSize(inputFormat.getWidth(), inputFormat.getHeight()); 177 } 178 179 Frame[] empty = {}; 180 mNoiseProgram.process(empty, noiseFrame); 181 182 // Process 183 Frame[] inputs = {input, noiseFrame}; 184 mGrainProgram.process(inputs, output); 185 186 // Push output 187 pushOutput("image", output); 188 189 // Release pushed frame 190 output.release(); 191 noiseFrame.release(); 192 } 193} 194