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 28public class SharpenFilter extends Filter { 29 30 @GenerateFieldPort(name = "scale", hasDefault = true) 31 private float mScale = 0f; 32 33 @GenerateFieldPort(name = "tile_size", hasDefault = true) 34 private int mTileSize = 640; 35 36 private Program mProgram; 37 38 private int mWidth = 0; 39 private int mHeight = 0; 40 private int mTarget = FrameFormat.TARGET_UNSPECIFIED; 41 42 private final String mSharpenShader = 43 "precision mediump float;\n" + 44 "uniform sampler2D tex_sampler_0;\n" + 45 "uniform float scale;\n" + 46 "uniform float stepsizeX;\n" + 47 "uniform float stepsizeY;\n" + 48 "varying vec2 v_texcoord;\n" + 49 "void main() {\n" + 50 " vec3 nbr_color = vec3(0.0, 0.0, 0.0);\n" + 51 " vec2 coord;\n" + 52 " vec4 color = texture2D(tex_sampler_0, v_texcoord);\n" + 53 " coord.x = v_texcoord.x - 0.5 * stepsizeX;\n" + 54 " coord.y = v_texcoord.y - stepsizeY;\n" + 55 " nbr_color += texture2D(tex_sampler_0, coord).rgb - color.rgb;\n" + 56 " coord.x = v_texcoord.x - stepsizeX;\n" + 57 " coord.y = v_texcoord.y + 0.5 * stepsizeY;\n" + 58 " nbr_color += texture2D(tex_sampler_0, coord).rgb - color.rgb;\n" + 59 " coord.x = v_texcoord.x + stepsizeX;\n" + 60 " coord.y = v_texcoord.y - 0.5 * stepsizeY;\n" + 61 " nbr_color += texture2D(tex_sampler_0, coord).rgb - color.rgb;\n" + 62 " coord.x = v_texcoord.x + stepsizeX;\n" + 63 " coord.y = v_texcoord.y + 0.5 * stepsizeY;\n" + 64 " nbr_color += texture2D(tex_sampler_0, coord).rgb - color.rgb;\n" + 65 " gl_FragColor = vec4(color.rgb - 2.0 * scale * nbr_color, color.a);\n" + 66 "}\n"; 67 68 public SharpenFilter(String name) { 69 super(name); 70 } 71 72 @Override 73 public void setupPorts() { 74 addMaskedInputPort("image", ImageFormat.create(ImageFormat.COLORSPACE_RGBA)); 75 addOutputBasedOnInput("image", "image"); 76 } 77 78 @Override 79 public FrameFormat getOutputFormat(String portName, FrameFormat inputFormat) { 80 return inputFormat; 81 } 82 83 public void initProgram(FilterContext context, int target) { 84 switch (target) { 85 case FrameFormat.TARGET_GPU: 86 ShaderProgram shaderProgram = new ShaderProgram(context, mSharpenShader); 87 shaderProgram.setMaximumTileSize(mTileSize); 88 mProgram = shaderProgram; 89 break; 90 91 default: 92 throw new RuntimeException("Filter Sharpen does not support frames of " + 93 "target " + target + "!"); 94 } 95 mTarget = target; 96 } 97 98 @Override 99 public void process(FilterContext context) { 100 // Get input frame 101 Frame input = pullInput("image"); 102 FrameFormat inputFormat = input.getFormat(); 103 104 // Create output frame 105 Frame output = context.getFrameManager().newFrame(inputFormat); 106 107 // Create program if not created already 108 if (mProgram == null || inputFormat.getTarget() != mTarget) { 109 initProgram(context, inputFormat.getTarget()); 110 } 111 112 // Check if the frame size has changed 113 if (inputFormat.getWidth() != mWidth || inputFormat.getHeight() != mHeight) { 114 updateFrameSize(inputFormat.getWidth(), inputFormat.getHeight()); 115 } 116 117 // Process 118 mProgram.process(input, output); 119 120 // Push output 121 pushOutput("image", output); 122 123 // Release pushed frame 124 output.release(); 125 } 126 127 private void updateFrameSize(int width, int height) { 128 mWidth = width; 129 mHeight = height; 130 131 if (mProgram != null) { 132 mProgram.setHostValue("stepsizeX", 1.0f / mWidth); 133 mProgram.setHostValue("stepsizeY", 1.0f / mHeight); 134 updateParameters(); 135 } 136 } 137 138 private void updateParameters() { 139 mProgram.setHostValue("scale", mScale); 140 } 141 142 @Override 143 public void fieldPortValueUpdated(String name, FilterContext context) { 144 if (mProgram != null) { 145 updateParameters(); 146 } 147 } 148} 149