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 18package android.filterpacks.imageproc; 19 20import android.filterfw.core.FilterContext; 21import android.filterfw.core.FrameFormat; 22import android.filterfw.core.GenerateFieldPort; 23import android.filterfw.core.MutableFrameFormat; 24import android.filterfw.core.Program; 25import android.filterfw.core.ShaderProgram; 26import android.filterfw.format.ImageFormat; 27 28/** 29 * @hide 30 */ 31public class ToGrayFilter extends SimpleImageFilter { 32 33 @GenerateFieldPort(name = "invertSource", hasDefault = true) 34 private boolean mInvertSource = false; 35 36 @GenerateFieldPort(name = "tile_size", hasDefault = true) 37 private int mTileSize = 640; 38 39 private MutableFrameFormat mOutputFormat; 40 41 private static final String mColorToGray4Shader = 42 "precision mediump float;\n" + 43 "uniform sampler2D tex_sampler_0;\n" + 44 "varying vec2 v_texcoord;\n" + 45 "void main() {\n" + 46 " vec4 color = texture2D(tex_sampler_0, v_texcoord);\n" + 47 " float y = dot(color, vec4(0.299, 0.587, 0.114, 0));\n" + 48 " gl_FragColor = vec4(y, y, y, color.a);\n" + 49 "}\n"; 50 51 public ToGrayFilter(String name) { 52 super(name, null); 53 } 54 55 @Override 56 public void setupPorts() { 57 addMaskedInputPort("image", ImageFormat.create(ImageFormat.COLORSPACE_RGBA, 58 FrameFormat.TARGET_GPU)); 59 addOutputBasedOnInput("image", "image"); 60 } 61 62 @Override 63 protected Program getNativeProgram(FilterContext context) { 64 throw new RuntimeException("Native toGray not implemented yet!"); 65 } 66 67 @Override 68 protected Program getShaderProgram(FilterContext context) { 69 int inputChannels = getInputFormat("image").getBytesPerSample(); 70 if (inputChannels != 4) { 71 throw new RuntimeException("Unsupported GL input channels: " + 72 inputChannels + "! Channels must be 4!"); 73 } 74 ShaderProgram program = new ShaderProgram(context, mColorToGray4Shader); 75 program.setMaximumTileSize(mTileSize); 76 if (mInvertSource) 77 program.setSourceRect(0.0f, 1.0f, 1.0f, -1.0f); 78 return program; 79 } 80 81} 82