| /* |
| * Copyright (C) 2011 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package android.filterpacks.imageproc; |
| |
| import android.filterfw.core.Filter; |
| import android.filterfw.core.FilterContext; |
| import android.filterfw.core.Frame; |
| import android.filterfw.core.FrameFormat; |
| import android.filterfw.core.GenerateFieldPort; |
| import android.filterfw.core.MutableFrameFormat; |
| import android.filterfw.core.Program; |
| import android.filterfw.core.ShaderProgram; |
| import android.filterfw.format.ImageFormat; |
| |
| public class ImageSlicer extends Filter { |
| |
| @GenerateFieldPort(name = "xSlices") |
| private int mXSlices; |
| |
| @GenerateFieldPort(name = "ySlices") |
| private int mYSlices; |
| |
| @GenerateFieldPort(name = "padSize") |
| private int mPadSize; |
| |
| // The current slice index from 0 to xSlices * ySlices |
| private int mSliceIndex; |
| |
| private Frame mOriginalFrame; |
| |
| private Program mProgram; |
| |
| private int mInputWidth; |
| private int mInputHeight; |
| |
| private int mSliceWidth; |
| private int mSliceHeight; |
| |
| private int mOutputWidth; |
| private int mOutputHeight; |
| |
| public ImageSlicer(String name) { |
| super(name); |
| mSliceIndex = 0; |
| } |
| |
| @Override |
| public void setupPorts() { |
| addMaskedInputPort("image", ImageFormat.create(ImageFormat.COLORSPACE_RGBA, |
| FrameFormat.TARGET_GPU)); |
| addOutputBasedOnInput("image", "image"); |
| } |
| |
| @Override |
| public FrameFormat getOutputFormat(String portName, FrameFormat inputFormat) { |
| return inputFormat; |
| } |
| |
| private void calcOutputFormatForInput(Frame frame) { |
| |
| // calculate the output size based on input size, xSlices, and ySlices |
| mInputWidth = frame.getFormat().getWidth(); |
| mInputHeight = frame.getFormat().getHeight(); |
| |
| mSliceWidth = (mInputWidth + mXSlices - 1) / mXSlices; |
| mSliceHeight = (mInputHeight + mYSlices - 1)/ mYSlices; |
| |
| mOutputWidth = mSliceWidth + mPadSize * 2; |
| mOutputHeight = mSliceHeight + mPadSize * 2; |
| } |
| |
| |
| @Override |
| public void process(FilterContext context) { |
| |
| // Get input frame |
| if (mSliceIndex == 0) { |
| mOriginalFrame = pullInput("image"); |
| calcOutputFormatForInput(mOriginalFrame); |
| } |
| |
| FrameFormat inputFormat = mOriginalFrame.getFormat(); |
| MutableFrameFormat outputFormat = inputFormat.mutableCopy(); |
| outputFormat.setDimensions(mOutputWidth, mOutputHeight); |
| |
| // Create output frame |
| Frame output = context.getFrameManager().newFrame(outputFormat); |
| |
| // Create the program if not created already |
| if (mProgram == null) { |
| mProgram = ShaderProgram.createIdentity(context); |
| } |
| |
| // Calculate the four corner of the source region |
| int xSliceIndex = mSliceIndex % mXSlices; |
| int ySliceIndex = mSliceIndex / mXSlices; |
| |
| // TODO(rslin) : not sure shifting by 0.5 is needed. |
| float x0 = (xSliceIndex * mSliceWidth - mPadSize) / ((float) mInputWidth); |
| float y0 = (ySliceIndex * mSliceHeight - mPadSize) / ((float) mInputHeight); |
| |
| ((ShaderProgram) mProgram).setSourceRect(x0, y0, |
| ((float) mOutputWidth) / mInputWidth, |
| ((float) mOutputHeight) / mInputHeight); |
| |
| // Process |
| mProgram.process(mOriginalFrame, output); |
| mSliceIndex++; |
| |
| if (mSliceIndex == mXSlices * mYSlices) { |
| mSliceIndex = 0; |
| mOriginalFrame.release(); |
| setWaitsOnInputPort("image", true); |
| } else { |
| // Retain the original frame so it can be used next time. |
| mOriginalFrame.retain(); |
| setWaitsOnInputPort("image", false); |
| } |
| |
| // Push output |
| pushOutput("image", output); |
| |
| // Release pushed frame |
| output.release(); |
| } |
| } |