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 31public class VignetteFilter extends Filter { 32 33 @GenerateFieldPort(name = "scale", hasDefault = true) 34 private float mScale = 0f; 35 36 @GenerateFieldPort(name = "tile_size", hasDefault = true) 37 private int mTileSize = 640; 38 39 private Program mProgram; 40 41 private int mWidth = 0; 42 private int mHeight = 0; 43 private int mTarget = FrameFormat.TARGET_UNSPECIFIED; 44 45 private final float mSlope = 20.0f; 46 private final float mShade = 0.85f; 47 48 private final String mVignetteShader = 49 "precision mediump float;\n" + 50 "uniform sampler2D tex_sampler_0;\n" + 51 "uniform float range;\n" + 52 "uniform float inv_max_dist;\n" + 53 "uniform float shade;\n" + 54 "uniform vec2 scale;\n" + 55 "varying vec2 v_texcoord;\n" + 56 "void main() {\n" + 57 " const float slope = 20.0;\n" + 58 " vec2 coord = v_texcoord - vec2(0.5, 0.5);\n" + 59 " float dist = length(coord * scale);\n" + 60 " float lumen = shade / (1.0 + exp((dist * inv_max_dist - range) * slope)) + (1.0 - shade);\n" + 61 " vec4 color = texture2D(tex_sampler_0, v_texcoord);\n" + 62 " gl_FragColor = vec4(color.rgb * lumen, color.a);\n" + 63 "}\n"; 64 65 public VignetteFilter(String name) { 66 super(name); 67 } 68 69 @Override 70 public void setupPorts() { 71 addMaskedInputPort("image", ImageFormat.create(ImageFormat.COLORSPACE_RGBA)); 72 addOutputBasedOnInput("image", "image"); 73 } 74 75 @Override 76 public FrameFormat getOutputFormat(String portName, FrameFormat inputFormat) { 77 return inputFormat; 78 } 79 80 public void initProgram(FilterContext context, int target) { 81 switch (target) { 82 case FrameFormat.TARGET_GPU: 83 ShaderProgram shaderProgram = new ShaderProgram(context, mVignetteShader); 84 shaderProgram.setMaximumTileSize(mTileSize); 85 mProgram = shaderProgram; 86 break; 87 88 default: 89 throw new RuntimeException("Filter Sharpen does not support frames of " + 90 "target " + target + "!"); 91 } 92 mTarget = target; 93 } 94 95 private void initParameters() { 96 if (mProgram != null) { 97 float scale[] = new float[2]; 98 if (mWidth > mHeight) { 99 scale[0] = 1f; 100 scale[1] = ((float) mHeight) / mWidth; 101 } else { 102 scale[0] = ((float) mWidth) / mHeight; 103 scale[1] = 1f; 104 } 105 float max_dist = ((float) Math.sqrt(scale[0] * scale[0] + scale[1] * scale[1])) * 0.5f; 106 mProgram.setHostValue("scale", scale); 107 mProgram.setHostValue("inv_max_dist", 1f / max_dist); 108 mProgram.setHostValue("shade", mShade); 109 110 updateParameters(); 111 } 112 } 113 114 private void updateParameters() { 115 // The 'range' is between 1.3 to 0.6. When scale is zero then range is 1.3 116 // which means no vignette at all because the luminousity difference is 117 // less than 1/256 and will cause nothing. 118 mProgram.setHostValue("range", 1.30f - (float) Math.sqrt(mScale) * 0.7f); 119 } 120 121 @Override 122 public void fieldPortValueUpdated(String name, FilterContext context) { 123 if (mProgram != null) { 124 updateParameters(); 125 } 126 } 127 128 @Override 129 public void process(FilterContext context) { 130 // Get input frame 131 Frame input = pullInput("image"); 132 FrameFormat inputFormat = input.getFormat(); 133 134 // Create program if not created already 135 if (mProgram == null || inputFormat.getTarget() != mTarget) { 136 initProgram(context, inputFormat.getTarget()); 137 } 138 139 // Check if the frame size has changed 140 if (inputFormat.getWidth() != mWidth || inputFormat.getHeight() != mHeight) { 141 mWidth = inputFormat.getWidth(); 142 mHeight = inputFormat.getHeight(); 143 initParameters(); 144 } 145 146 // Create output frame 147 Frame output = context.getFrameManager().newFrame(inputFormat); 148 149 // Process 150 mProgram.process(input, output); 151 152 // Push output 153 pushOutput("image", output); 154 155 // Release pushed frame 156 output.release(); 157 } 158} 159