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; 27import android.graphics.Color; 28 29public class TintFilter extends Filter { 30 31 @GenerateFieldPort(name = "tint", hasDefault = true) 32 private int mTint = 0xFF0000FF; 33 34 @GenerateFieldPort(name = "tile_size", hasDefault = true) 35 private int mTileSize = 640; 36 37 private Program mProgram; 38 private int mTarget = FrameFormat.TARGET_UNSPECIFIED; 39 40 private final String mTintShader = 41 "precision mediump float;\n" + 42 "uniform sampler2D tex_sampler_0;\n" + 43 "uniform vec3 tint;\n" + 44 "uniform vec3 color_ratio;\n" + 45 "varying vec2 v_texcoord;\n" + 46 "void main() {\n" + 47 " vec4 color = texture2D(tex_sampler_0, v_texcoord);\n" + 48 " float avg_color = dot(color_ratio, color.rgb);\n" + 49 " vec3 new_color = min(0.8 * avg_color + 0.2 * tint, 1.0);\n" + 50 " gl_FragColor = vec4(new_color.rgb, color.a);\n" + 51 "}\n"; 52 53 public TintFilter(String name) { 54 super(name); 55 } 56 57 @Override 58 public void setupPorts() { 59 addMaskedInputPort("image", ImageFormat.create(ImageFormat.COLORSPACE_RGBA)); 60 addOutputBasedOnInput("image", "image"); 61 } 62 63 @Override 64 public FrameFormat getOutputFormat(String portName, FrameFormat inputFormat) { 65 return inputFormat; 66 } 67 68 public void initProgram(FilterContext context, int target) { 69 switch (target) { 70 case FrameFormat.TARGET_GPU: 71 ShaderProgram shaderProgram = new ShaderProgram(context, mTintShader); 72 shaderProgram.setMaximumTileSize(mTileSize); 73 mProgram = shaderProgram; 74 break; 75 76 default: 77 throw new RuntimeException("Filter Sharpen does not support frames of " + 78 "target " + target + "!"); 79 } 80 mTarget = target; 81 } 82 83 @Override 84 public void fieldPortValueUpdated(String name, FilterContext context) { 85 if (mProgram != null) { 86 updateParameters(); 87 } 88 } 89 90 @Override 91 public void process(FilterContext context) { 92 // Get input frame 93 Frame input = pullInput("image"); 94 FrameFormat inputFormat = input.getFormat(); 95 96 // Create program if not created already 97 if (mProgram == null || inputFormat.getTarget() != mTarget) { 98 initProgram(context, inputFormat.getTarget()); 99 initParameters(); 100 } 101 102 // Create output frame 103 Frame output = context.getFrameManager().newFrame(inputFormat); 104 105 // Process 106 mProgram.process(input, output); 107 108 // Push output 109 pushOutput("image", output); 110 111 // Release pushed frame 112 output.release(); 113 } 114 115 private void initParameters() { 116 float color_ratio[] = {0.21f, 0.71f, 0.07f}; 117 mProgram.setHostValue("color_ratio", color_ratio); 118 119 updateParameters(); 120 } 121 122 private void updateParameters() { 123 float tint_color[] = {Color.red(mTint) / 255f, 124 Color.green(mTint) / 255f, 125 Color.blue(mTint) / 255f }; 126 127 mProgram.setHostValue("tint", tint_color); 128 } 129 130} 131