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.MutableFrameFormat; 25import android.filterfw.core.Program; 26import android.filterfw.core.ShaderProgram; 27import android.filterfw.format.ImageFormat; 28 29public class ImageSlicer extends Filter { 30 31 @GenerateFieldPort(name = "xSlices") 32 private int mXSlices; 33 34 @GenerateFieldPort(name = "ySlices") 35 private int mYSlices; 36 37 @GenerateFieldPort(name = "padSize") 38 private int mPadSize; 39 40 // The current slice index from 0 to xSlices * ySlices 41 private int mSliceIndex; 42 43 private Frame mOriginalFrame; 44 45 private Program mProgram; 46 47 private int mInputWidth; 48 private int mInputHeight; 49 50 private int mSliceWidth; 51 private int mSliceHeight; 52 53 private int mOutputWidth; 54 private int mOutputHeight; 55 56 public ImageSlicer(String name) { 57 super(name); 58 mSliceIndex = 0; 59 } 60 61 @Override 62 public void setupPorts() { 63 addMaskedInputPort("image", ImageFormat.create(ImageFormat.COLORSPACE_RGBA, 64 FrameFormat.TARGET_GPU)); 65 addOutputBasedOnInput("image", "image"); 66 } 67 68 @Override 69 public FrameFormat getOutputFormat(String portName, FrameFormat inputFormat) { 70 return inputFormat; 71 } 72 73 private void calcOutputFormatForInput(Frame frame) { 74 75 // calculate the output size based on input size, xSlices, and ySlices 76 mInputWidth = frame.getFormat().getWidth(); 77 mInputHeight = frame.getFormat().getHeight(); 78 79 mSliceWidth = (mInputWidth + mXSlices - 1) / mXSlices; 80 mSliceHeight = (mInputHeight + mYSlices - 1)/ mYSlices; 81 82 mOutputWidth = mSliceWidth + mPadSize * 2; 83 mOutputHeight = mSliceHeight + mPadSize * 2; 84 } 85 86 87 @Override 88 public void process(FilterContext context) { 89 90 // Get input frame 91 if (mSliceIndex == 0) { 92 mOriginalFrame = pullInput("image"); 93 calcOutputFormatForInput(mOriginalFrame); 94 } 95 96 FrameFormat inputFormat = mOriginalFrame.getFormat(); 97 MutableFrameFormat outputFormat = inputFormat.mutableCopy(); 98 outputFormat.setDimensions(mOutputWidth, mOutputHeight); 99 100 // Create output frame 101 Frame output = context.getFrameManager().newFrame(outputFormat); 102 103 // Create the program if not created already 104 if (mProgram == null) { 105 mProgram = ShaderProgram.createIdentity(context); 106 } 107 108 // Calculate the four corner of the source region 109 int xSliceIndex = mSliceIndex % mXSlices; 110 int ySliceIndex = mSliceIndex / mXSlices; 111 112 // TODO(rslin) : not sure shifting by 0.5 is needed. 113 float x0 = (xSliceIndex * mSliceWidth - mPadSize) / ((float) mInputWidth); 114 float y0 = (ySliceIndex * mSliceHeight - mPadSize) / ((float) mInputHeight); 115 116 ((ShaderProgram) mProgram).setSourceRect(x0, y0, 117 ((float) mOutputWidth) / mInputWidth, 118 ((float) mOutputHeight) / mInputHeight); 119 120 // Process 121 mProgram.process(mOriginalFrame, output); 122 mSliceIndex++; 123 124 if (mSliceIndex == mXSlices * mYSlices) { 125 mSliceIndex = 0; 126 mOriginalFrame.release(); 127 setWaitsOnInputPort("image", true); 128 } else { 129 // Retain the original frame so it can be used next time. 130 mOriginalFrame.retain(); 131 setWaitsOnInputPort("image", false); 132 } 133 134 // Push output 135 pushOutput("image", output); 136 137 // Release pushed frame 138 output.release(); 139 } 140} 141