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.FrameManager; 24import android.filterfw.core.GenerateFieldPort; 25import android.filterfw.core.KeyValueMap; 26import android.filterfw.core.MutableFrameFormat; 27import android.filterfw.core.Program; 28import android.filterfw.core.ShaderProgram; 29import android.filterfw.format.ImageFormat; 30 31public class ImageSlicer extends Filter { 32 33 @GenerateFieldPort(name = "xSlices") 34 private int mXSlices; 35 36 @GenerateFieldPort(name = "ySlices") 37 private int mYSlices; 38 39 @GenerateFieldPort(name = "padSize") 40 private int mPadSize; 41 42 // The current slice index from 0 to xSlices * ySlices 43 private int mSliceIndex; 44 45 private Frame mOriginalFrame; 46 47 private Program mProgram; 48 49 private int mInputWidth; 50 private int mInputHeight; 51 52 private int mSliceWidth; 53 private int mSliceHeight; 54 55 private int mOutputWidth; 56 private int mOutputHeight; 57 58 public ImageSlicer(String name) { 59 super(name); 60 mSliceIndex = 0; 61 } 62 63 @Override 64 public void setupPorts() { 65 addMaskedInputPort("image", ImageFormat.create(ImageFormat.COLORSPACE_RGBA, 66 FrameFormat.TARGET_GPU)); 67 addOutputBasedOnInput("image", "image"); 68 } 69 70 @Override 71 public FrameFormat getOutputFormat(String portName, FrameFormat inputFormat) { 72 return inputFormat; 73 } 74 75 private void calcOutputFormatForInput(Frame frame) { 76 77 // calculate the output size based on input size, xSlices, and ySlices 78 mInputWidth = frame.getFormat().getWidth(); 79 mInputHeight = frame.getFormat().getHeight(); 80 81 mSliceWidth = (mInputWidth + mXSlices - 1) / mXSlices; 82 mSliceHeight = (mInputHeight + mYSlices - 1)/ mYSlices; 83 84 mOutputWidth = mSliceWidth + mPadSize * 2; 85 mOutputHeight = mSliceHeight + mPadSize * 2; 86 } 87 88 89 @Override 90 public void process(FilterContext context) { 91 92 // Get input frame 93 if (mSliceIndex == 0) { 94 mOriginalFrame = pullInput("image"); 95 calcOutputFormatForInput(mOriginalFrame); 96 } 97 98 FrameFormat inputFormat = mOriginalFrame.getFormat(); 99 MutableFrameFormat outputFormat = inputFormat.mutableCopy(); 100 outputFormat.setDimensions(mOutputWidth, mOutputHeight); 101 102 // Create output frame 103 Frame output = context.getFrameManager().newFrame(outputFormat); 104 105 // Create the program if not created already 106 if (mProgram == null) { 107 mProgram = ShaderProgram.createIdentity(context); 108 } 109 110 // Calculate the four corner of the source region 111 int xSliceIndex = mSliceIndex % mXSlices; 112 int ySliceIndex = mSliceIndex / mXSlices; 113 114 // TODO(rslin) : not sure shifting by 0.5 is needed. 115 float x0 = (xSliceIndex * mSliceWidth - mPadSize) / ((float) mInputWidth); 116 float y0 = (ySliceIndex * mSliceHeight - mPadSize) / ((float) mInputHeight); 117 118 ((ShaderProgram) mProgram).setSourceRect(x0, y0, 119 ((float) mOutputWidth) / mInputWidth, 120 ((float) mOutputHeight) / mInputHeight); 121 122 // Process 123 mProgram.process(mOriginalFrame, output); 124 mSliceIndex++; 125 126 if (mSliceIndex == mXSlices * mYSlices) { 127 mSliceIndex = 0; 128 mOriginalFrame.release(); 129 setWaitsOnInputPort("image", true); 130 } else { 131 // Retain the original frame so it can be used next time. 132 mOriginalFrame.retain(); 133 setWaitsOnInputPort("image", false); 134 } 135 136 // Push output 137 pushOutput("image", output); 138 139 // Release pushed frame 140 output.release(); 141 } 142} 143