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.Filter; 20 import android.filterfw.core.FilterContext; 21 import android.filterfw.core.Frame; 22 import android.filterfw.core.FrameFormat; 23 import android.filterfw.core.GenerateFieldPort; 24 import android.filterfw.core.KeyValueMap; 25 import android.filterfw.core.NativeProgram; 26 import android.filterfw.core.NativeFrame; 27 import android.filterfw.core.Program; 28 import android.filterfw.core.ShaderProgram; 29 import android.filterfw.format.ImageFormat; 30 import android.filterfw.geometry.Quad; 31 import android.filterfw.geometry.Point; 32 33 import java.util.Date; 34 import java.util.Random; 35 36 public class GrainFilter extends Filter { 37 38 private static final int RAND_THRESHOLD = 128; 39 40 @GenerateFieldPort(name = "strength", hasDefault = true) 41 private float mScale = 0f; 42 43 @GenerateFieldPort(name = "tile_size", hasDefault = true) 44 private int mTileSize = 640; 45 46 private Program mGrainProgram; 47 private Program mNoiseProgram; 48 49 private int mWidth = 0; 50 private int mHeight = 0; 51 private int mTarget = FrameFormat.TARGET_UNSPECIFIED; 52 53 private Random mRandom; 54 55 private final String mNoiseShader = 56 "precision mediump float;\n" + 57 "uniform vec2 seed;\n" + 58 "varying vec2 v_texcoord;\n" + 59 "float rand(vec2 loc) {\n" + 60 " float theta1 = dot(loc, vec2(0.9898, 0.233));\n" + 61 " float theta2 = dot(loc, vec2(12.0, 78.0));\n" + 62 " float value = cos(theta1) * sin(theta2) + sin(theta1) * cos(theta2);\n" + 63 // keep value of part1 in range: (2^-14 to 2^14). 64 " float temp = mod(197.0 * value, 1.0) + value;\n" + 65 " float part1 = mod(220.0 * temp, 1.0) + temp;\n" + 66 " float part2 = value * 0.5453;\n" + 67 " float part3 = cos(theta1 + theta2) * 0.43758;\n" + 68 " return fract(part1 + part2 + part3);\n" + 69 "}\n" + 70 "void main() {\n" + 71 " gl_FragColor = vec4(rand(v_texcoord + seed), 0.0, 0.0, 1.0);\n" + 72 "}\n"; 73 74 private final String mGrainShader = 75 "precision mediump float;\n" + 76 "uniform sampler2D tex_sampler_0;\n" + 77 "uniform sampler2D tex_sampler_1;\n" + 78 "uniform float scale;\n" + 79 "uniform float stepX;\n" + 80 "uniform float stepY;\n" + 81 "varying vec2 v_texcoord;\n" + 82 "void main() {\n" + 83 " float noise = texture2D(tex_sampler_1, v_texcoord + vec2(-stepX, -stepY)).r * 0.224;\n" + 84 " noise += texture2D(tex_sampler_1, v_texcoord + vec2(-stepX, stepY)).r * 0.224;\n" + 85 " noise += texture2D(tex_sampler_1, v_texcoord + vec2(stepX, -stepY)).r * 0.224;\n" + 86 " noise += texture2D(tex_sampler_1, v_texcoord + vec2(stepX, stepY)).r * 0.224;\n" + 87 " noise += 0.4448;\n" + 88 " noise *= scale;\n" + 89 " vec4 color = texture2D(tex_sampler_0, v_texcoord);\n" + 90 " float energy = 0.33333 * color.r + 0.33333 * color.g + 0.33333 * color.b;\n" + 91 " float mask = (1.0 - sqrt(energy));\n" + 92 " float weight = 1.0 - 1.333 * mask * noise;\n" + 93 " gl_FragColor = vec4(color.rgb * weight, color.a);\n" + 94 "}\n"; 95 96 public GrainFilter(String name) { 97 super(name); 98 mRandom = new Random(new Date().getTime()); 99 } 100 101 @Override 102 public void setupPorts() { 103 addMaskedInputPort("image", ImageFormat.create(ImageFormat.COLORSPACE_RGBA)); 104 addOutputBasedOnInput("image", "image"); 105 } 106 107 @Override 108 public FrameFormat getOutputFormat(String portName, FrameFormat inputFormat) { 109 return inputFormat; 110 } 111 112 public void initProgram(FilterContext context, int target) { 113 switch (target) { 114 case FrameFormat.TARGET_GPU: 115 ShaderProgram shaderProgram = new ShaderProgram(context, mNoiseShader); 116 shaderProgram.setMaximumTileSize(mTileSize); 117 mNoiseProgram = shaderProgram; 118 119 shaderProgram = new ShaderProgram(context, mGrainShader); 120 shaderProgram.setMaximumTileSize(mTileSize); 121 mGrainProgram = shaderProgram; 122 break; 123 124 default: 125 throw new RuntimeException("Filter Sharpen does not support frames of " + 126 "target " + target + "!"); 127 } 128 mTarget = target; 129 } 130 131 private void updateParameters() { 132 float seed[] = { mRandom.nextFloat(), mRandom.nextFloat() }; 133 mNoiseProgram.setHostValue("seed", seed); 134 135 mGrainProgram.setHostValue("scale", mScale); 136 } 137 138 private void updateFrameSize(int width, int height) { 139 mWidth = width; 140 mHeight = height; 141 142 if (mGrainProgram != null) { 143 mGrainProgram.setHostValue("stepX", 0.5f / mWidth); 144 mGrainProgram.setHostValue("stepY", 0.5f / mHeight); 145 updateParameters(); 146 } 147 } 148 149 @Override 150 public void fieldPortValueUpdated(String name, FilterContext context) { 151 if (mGrainProgram != null && mNoiseProgram != null) { 152 updateParameters(); 153 } 154 } 155 156 @Override 157 public void process(FilterContext context) { 158 // Get input frame 159 Frame input = pullInput("image"); 160 FrameFormat inputFormat = input.getFormat(); 161 162 FrameFormat noiseFormat = ImageFormat.create(inputFormat.getWidth() / 2, 163 inputFormat.getHeight() / 2, 164 ImageFormat.COLORSPACE_RGBA, 165 FrameFormat.TARGET_GPU); 166 167 // Create noise frame 168 Frame noiseFrame = context.getFrameManager().newFrame(inputFormat); 169 170 // Create output frame 171 Frame output = context.getFrameManager().newFrame(inputFormat); 172 173 // Create program if not created already 174 if (mNoiseProgram == null || mGrainProgram == null || inputFormat.getTarget() != mTarget) { 175 initProgram(context, inputFormat.getTarget()); 176 updateParameters(); 177 } 178 179 // Check if the frame size has changed 180 if (inputFormat.getWidth() != mWidth || inputFormat.getHeight() != mHeight) { 181 updateFrameSize(inputFormat.getWidth(), inputFormat.getHeight()); 182 } 183 184 Frame[] empty = {}; 185 mNoiseProgram.process(empty, noiseFrame); 186 187 // Process 188 Frame[] inputs = {input, noiseFrame}; 189 mGrainProgram.process(inputs, output); 190 191 // Push output 192 pushOutput("image", output); 193 194 // Release pushed frame 195 output.release(); 196 noiseFrame.release(); 197 } 198 } 199
