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      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 package android.filterpacks.imageproc;
     18 
     19 import android.filterfw.core.Filter;
     20 import android.filterfw.core.FilterContext;
     21 import android.filterfw.core.Frame;
     22 import android.filterfw.core.FrameFormat;
     23 import android.filterfw.core.GenerateFieldPort;
     24 import android.filterfw.core.MutableFrameFormat;
     25 import android.filterfw.core.Program;
     26 import android.filterfw.core.ShaderProgram;
     27 import android.filterfw.format.ImageFormat;
     28 
     29 public class ImageStitcher 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     private Program mProgram;
     41     private Frame mOutputFrame;
     42 
     43     private int mInputWidth;
     44     private int mInputHeight;
     45 
     46     private int mImageWidth;
     47     private int mImageHeight;
     48 
     49     private int mSliceWidth;
     50     private int mSliceHeight;
     51 
     52     private int mSliceIndex;
     53 
     54     public ImageStitcher(String name) {
     55         super(name);
     56         mSliceIndex = 0;
     57     }
     58 
     59     @Override
     60     public void setupPorts() {
     61         addMaskedInputPort("image", ImageFormat.create(ImageFormat.COLORSPACE_RGBA,
     62                                                       FrameFormat.TARGET_GPU));
     63         addOutputBasedOnInput("image", "image");
     64     }
     65 
     66     @Override
     67     public FrameFormat getOutputFormat(String portName, FrameFormat inputFormat) {
     68         return inputFormat;
     69     }
     70 
     71     private FrameFormat calcOutputFormatForInput(FrameFormat format) {
     72         MutableFrameFormat outputFormat = format.mutableCopy();
     73 
     74         mInputWidth = format.getWidth();
     75         mInputHeight = format.getHeight();
     76 
     77         mSliceWidth = mInputWidth - 2 * mPadSize;
     78         mSliceHeight = mInputHeight - 2 * mPadSize;
     79 
     80         mImageWidth =  mSliceWidth * mXSlices;
     81         mImageHeight = mSliceHeight * mYSlices;
     82 
     83         outputFormat.setDimensions(mImageWidth, mImageHeight);
     84         return outputFormat;
     85     }
     86 
     87     @Override
     88     public void process(FilterContext context) {
     89         // Get input frame
     90         Frame input = pullInput("image");
     91         FrameFormat format = input.getFormat();
     92 
     93         // Create output frame
     94         if (mSliceIndex == 0) {
     95             mOutputFrame = context.getFrameManager().newFrame(calcOutputFormatForInput(format));
     96         } else {
     97             if ((format.getWidth() != mInputWidth) ||
     98                 (format.getHeight() != mInputHeight)) {
     99                 // CHECK input format here
    100                 throw new RuntimeException("Image size should not change.");
    101             }
    102         }
    103 
    104         // Create the program if not created already
    105         if (mProgram == null) {
    106             mProgram = ShaderProgram.createIdentity(context);
    107         }
    108 
    109         // TODO(rslin) : not sure shifting by 0.5 is needed.
    110         float x0 = ((float) mPadSize) / mInputWidth;
    111         float y0 = ((float) mPadSize) / mInputHeight;
    112 
    113         int outputOffsetX = (mSliceIndex % mXSlices) * mSliceWidth;
    114         int outputOffsetY = (mSliceIndex / mXSlices) * mSliceHeight;
    115 
    116         float outputWidth = (float) Math.min(mSliceWidth, mImageWidth - outputOffsetX);
    117         float outputHeight = (float) Math.min(mSliceHeight, mImageHeight - outputOffsetY);
    118 
    119         // We need to set the source rect as well because the input are padded images.
    120         ((ShaderProgram) mProgram).setSourceRect(x0, y0,
    121                                                  outputWidth / mInputWidth,
    122                                                  outputHeight / mInputHeight);
    123 
    124         ((ShaderProgram) mProgram).setTargetRect(((float) outputOffsetX)/ mImageWidth,
    125                                                  ((float) outputOffsetY) / mImageHeight,
    126                                                  outputWidth / mImageWidth,
    127                                                  outputHeight / mImageHeight);
    128 
    129         // Process this tile
    130         mProgram.process(input, mOutputFrame);
    131         mSliceIndex++;
    132 
    133         // Push output
    134         if (mSliceIndex == mXSlices * mYSlices) {
    135             pushOutput("image", mOutputFrame);
    136             mOutputFrame.release();
    137             mSliceIndex = 0;
    138         }
    139     }
    140 }
    141