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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 
     18 package android.filterpacks.imageproc;
     19 
     20 import android.filterfw.core.Filter;
     21 import android.filterfw.core.FilterContext;
     22 import android.filterfw.core.Frame;
     23 import android.filterfw.core.FrameFormat;
     24 import android.filterfw.core.ShaderProgram;
     25 import android.filterfw.geometry.Quad;
     26 import android.filterfw.format.ImageFormat;
     27 import android.filterfw.format.ObjectFormat;
     28 
     29 /**
     30  * @hide
     31  */
     32 public class DrawOverlayFilter extends Filter {
     33 
     34     private ShaderProgram mProgram;
     35 
     36     public DrawOverlayFilter(String name) {
     37         super(name);
     38     }
     39 
     40     @Override
     41     public void setupPorts() {
     42         FrameFormat imageFormatMask = ImageFormat.create(ImageFormat.COLORSPACE_RGBA,
     43                                                          FrameFormat.TARGET_GPU);
     44         addMaskedInputPort("source", imageFormatMask);
     45         addMaskedInputPort("overlay", imageFormatMask);
     46         addMaskedInputPort("box", ObjectFormat.fromClass(Quad.class, FrameFormat.TARGET_SIMPLE));
     47         addOutputBasedOnInput("image", "source");
     48     }
     49 
     50     @Override
     51     public FrameFormat getOutputFormat(String portName, FrameFormat inputFormat) {
     52         return inputFormat;
     53     }
     54 
     55     @Override
     56     public void prepare(FilterContext context) {
     57         mProgram = ShaderProgram.createIdentity(context);
     58     }
     59 
     60     @Override
     61     public void process(FilterContext env) {
     62         // Get input frame
     63         Frame sourceFrame = pullInput("source");
     64         Frame overlayFrame = pullInput("overlay");
     65         Frame boxFrame = pullInput("box");
     66 
     67         // Get the box
     68         Quad box = (Quad)boxFrame.getObjectValue();
     69         box = box.translated(1.0f, 1.0f).scaled(2.0f);
     70 
     71         mProgram.setTargetRegion(box);
     72 
     73         // Create output frame with copy of input
     74         Frame output = env.getFrameManager().newFrame(sourceFrame.getFormat());
     75         output.setDataFromFrame(sourceFrame);
     76 
     77         // Draw onto output
     78         mProgram.process(overlayFrame, output);
     79 
     80         // Push output
     81         pushOutput("image", output);
     82 
     83         // Release pushed frame
     84         output.release();
     85     }
     86 }
     87