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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.GenerateFieldPort;
     25 import android.filterfw.core.MutableFrameFormat;
     26 import android.filterfw.core.Program;
     27 import android.filterfw.core.ShaderProgram;
     28 import android.filterfw.geometry.Quad;
     29 import android.filterfw.format.ImageFormat;
     30 import android.filterfw.format.ObjectFormat;
     31 
     32 /**
     33  * @hide
     34  */
     35 public class CropFilter extends Filter {
     36 
     37     private Program mProgram;
     38     private FrameFormat mLastFormat = null;
     39 
     40     @GenerateFieldPort(name = "owidth")
     41     private int mOutputWidth = -1;
     42 
     43     @GenerateFieldPort(name = "oheight")
     44     private int mOutputHeight = -1;
     45 
     46     @GenerateFieldPort(name = "fillblack")
     47     private boolean mFillBlack = false;
     48 
     49     public CropFilter(String name) {
     50         super(name);
     51     }
     52 
     53     private final String mFragShader =
     54       "precision mediump float;\n" +
     55       "uniform sampler2D tex_sampler_0;\n" +
     56       "varying vec2 v_texcoord;\n" +
     57       "void main() {\n" +
     58       "  const vec2 lo = vec2(0.0, 0.0);\n" +
     59       "  const vec2 hi = vec2(1.0, 1.0);\n" +
     60       "  const vec4 black = vec4(0.0, 0.0, 0.0, 1.0);\n" +
     61       "  bool out_of_bounds =\n" +
     62       "    any(lessThan(v_texcoord, lo)) ||\n" +
     63       "    any(greaterThan(v_texcoord, hi));\n" +
     64       "  if (out_of_bounds) {\n" +
     65       "    gl_FragColor = black;\n" +
     66       "  } else {\n" +
     67       "    gl_FragColor = texture2D(tex_sampler_0, v_texcoord);\n" +
     68       "  }\n" +
     69       "}\n";
     70 
     71     @Override
     72     public void setupPorts() {
     73         addMaskedInputPort("image", ImageFormat.create(ImageFormat.COLORSPACE_RGBA));
     74         addMaskedInputPort("box", ObjectFormat.fromClass(Quad.class, FrameFormat.TARGET_SIMPLE));
     75         addOutputBasedOnInput("image", "image");
     76     }
     77 
     78     @Override
     79     public FrameFormat getOutputFormat(String portName, FrameFormat inputFormat) {
     80         // Make sure output size is set to unspecified, as we do not know what we will be resizing
     81         // to.
     82         MutableFrameFormat outputFormat = inputFormat.mutableCopy();
     83         outputFormat.setDimensions(FrameFormat.SIZE_UNSPECIFIED, FrameFormat.SIZE_UNSPECIFIED);
     84         return outputFormat;
     85     }
     86 
     87     protected void createProgram(FilterContext context, FrameFormat format) {
     88         // TODO: Add CPU version
     89         if (mLastFormat != null && mLastFormat.getTarget() == format.getTarget()) return;
     90         mLastFormat = format;
     91         mProgram = null;
     92         switch (format.getTarget()) {
     93             case FrameFormat.TARGET_GPU:
     94               if(mFillBlack)
     95                 mProgram = new ShaderProgram(context, mFragShader);
     96               else
     97                 mProgram = ShaderProgram.createIdentity(context);
     98 
     99                 break;
    100         }
    101         if (mProgram == null) {
    102             throw new RuntimeException("Could not create a program for crop filter " + this + "!");
    103         }
    104     }
    105 
    106     @Override
    107     public void process(FilterContext env) {
    108         // Get input frame
    109         Frame imageFrame = pullInput("image");
    110         Frame boxFrame = pullInput("box");
    111 
    112         createProgram(env, imageFrame.getFormat());
    113 
    114         // Get the box
    115         Quad box = (Quad)boxFrame.getObjectValue();
    116 
    117         // Create output format
    118         MutableFrameFormat outputFormat = imageFrame.getFormat().mutableCopy();
    119         outputFormat.setDimensions(mOutputWidth == -1 ? outputFormat.getWidth() : mOutputWidth,
    120                                    mOutputHeight == -1 ? outputFormat.getHeight() : mOutputHeight);
    121 
    122         // Create output frame
    123         Frame output = env.getFrameManager().newFrame(outputFormat);
    124 
    125         // Set the program parameters
    126         if (mProgram instanceof ShaderProgram) {
    127             ShaderProgram shaderProgram = (ShaderProgram)mProgram;
    128             shaderProgram.setSourceRegion(box);
    129         }
    130 
    131         mProgram.process(imageFrame, output);
    132 
    133         // Push output
    134         pushOutput("image", output);
    135 
    136         // Release pushed frame
    137         output.release();
    138     }
    139 
    140 
    141 }
    142