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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.Program;
     25 import android.filterfw.core.ShaderProgram;
     26 import android.filterfw.format.ImageFormat;
     27 import android.graphics.Color;
     28 
     29 public class DuotoneFilter extends Filter {
     30 
     31     @GenerateFieldPort(name = "first_color", hasDefault = true)
     32     private int mFirstColor = 0xFFFF0000;
     33 
     34     @GenerateFieldPort(name = "second_color", hasDefault = true)
     35     private int mSecondColor = 0xFFFFFF00;
     36 
     37     @GenerateFieldPort(name = "tile_size", hasDefault = true)
     38     private int mTileSize = 640;
     39 
     40     private Program mProgram;
     41     private int mTarget = FrameFormat.TARGET_UNSPECIFIED;
     42 
     43     private final String mDuotoneShader =
     44             "precision mediump float;\n" +
     45             "uniform sampler2D tex_sampler_0;\n" +
     46             "uniform vec3 first;\n" +
     47             "uniform vec3 second;\n" +
     48             "varying vec2 v_texcoord;\n" +
     49             "void main() {\n" +
     50             "  vec4 color = texture2D(tex_sampler_0, v_texcoord);\n" +
     51             "  float energy = (color.r + color.g + color.b) * 0.3333;\n" +
     52             "  vec3 new_color = (1.0 - energy) * first + energy * second;\n" +
     53             "  gl_FragColor = vec4(new_color.rgb, color.a);\n" +
     54             "}\n";
     55 
     56     public DuotoneFilter(String name) {
     57       super(name);
     58     }
     59 
     60     @Override
     61     public void setupPorts() {
     62         addMaskedInputPort("image", ImageFormat.create(ImageFormat.COLORSPACE_RGBA));
     63         addOutputBasedOnInput("image", "image");
     64     }
     65 
     66     @Override
     67     public FrameFormat getOutputFormat(String portName, FrameFormat inputFormat) {
     68         return inputFormat;
     69     }
     70 
     71     public void initProgram(FilterContext context, int target) {
     72         switch (target) {
     73             case FrameFormat.TARGET_GPU:
     74                 ShaderProgram shaderProgram = new ShaderProgram(context, mDuotoneShader);
     75                 shaderProgram.setMaximumTileSize(mTileSize);
     76                 mProgram = shaderProgram;
     77                 break;
     78 
     79             default:
     80                 throw new RuntimeException("Filter Duotone does not support frames of " +
     81                     "target " + target + "!");
     82         }
     83         mTarget = target;
     84     }
     85 
     86     @Override
     87     public void process(FilterContext context) {
     88         // Get input frame
     89         Frame input = pullInput("image");
     90         FrameFormat inputFormat = input.getFormat();
     91 
     92         // Create output frame
     93         Frame output = context.getFrameManager().newFrame(inputFormat);
     94 
     95         // Create program if not created already
     96         if (mProgram == null || inputFormat.getTarget() != mTarget) {
     97             initProgram(context, inputFormat.getTarget());
     98         }
     99         updateParameters();
    100 
    101         // Process
    102         mProgram.process(input, output);
    103 
    104         // Push output
    105         pushOutput("image", output);
    106 
    107         // Release pushed frame
    108         output.release();
    109     }
    110 
    111     private void updateParameters() {
    112         float first[] = { Color.red(mFirstColor)/255f,
    113                 Color.green(mFirstColor)/255f,
    114                 Color.blue(mFirstColor)/255f };
    115         float second[] = { Color.red(mSecondColor)/255f,
    116                 Color.green(mSecondColor)/255f,
    117                 Color.blue(mSecondColor)/255f };
    118 
    119         mProgram.setHostValue("first", first);
    120         mProgram.setHostValue("second", second);
    121     }
    122 }
    123