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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.KeyValueMap;
     25 import android.filterfw.core.NativeProgram;
     26 import android.filterfw.core.NativeFrame;
     27 import android.filterfw.core.Program;
     28 import android.filterfw.core.ShaderProgram;
     29 import android.filterfw.format.ImageFormat;
     30 import android.graphics.Color;
     31 
     32 public class TintFilter extends Filter {
     33 
     34     @GenerateFieldPort(name = "tint", hasDefault = true)
     35     private int mTint = 0xFF0000FF;
     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 mTintShader =
     44             "precision mediump float;\n" +
     45             "uniform sampler2D tex_sampler_0;\n" +
     46             "uniform vec3 tint;\n" +
     47             "uniform vec3 color_ratio;\n" +
     48             "varying vec2 v_texcoord;\n" +
     49             "void main() {\n" +
     50             "  vec4 color = texture2D(tex_sampler_0, v_texcoord);\n" +
     51             "  float avg_color = dot(color_ratio, color.rgb);\n" +
     52             "  vec3 new_color = min(0.8 * avg_color + 0.2 * tint, 1.0);\n" +
     53             "  gl_FragColor = vec4(new_color.rgb, color.a);\n" +
     54             "}\n";
     55 
     56     public TintFilter(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, mTintShader);
     75                 shaderProgram.setMaximumTileSize(mTileSize);
     76                 mProgram = shaderProgram;
     77                 break;
     78 
     79             default:
     80                 throw new RuntimeException("Filter Sharpen does not support frames of " +
     81                     "target " + target + "!");
     82         }
     83         mTarget = target;
     84     }
     85 
     86     @Override
     87     public void fieldPortValueUpdated(String name, FilterContext context) {
     88         if (mProgram != null) {
     89             updateParameters();
     90         }
     91     }
     92 
     93     @Override
     94     public void process(FilterContext context) {
     95         // Get input frame
     96         Frame input = pullInput("image");
     97         FrameFormat inputFormat = input.getFormat();
     98 
     99         // Create program if not created already
    100         if (mProgram == null || inputFormat.getTarget() != mTarget) {
    101             initProgram(context, inputFormat.getTarget());
    102             initParameters();
    103         }
    104 
    105         // Create output frame
    106         Frame output = context.getFrameManager().newFrame(inputFormat);
    107 
    108         // Process
    109         mProgram.process(input, output);
    110 
    111         // Push output
    112         pushOutput("image", output);
    113 
    114         // Release pushed frame
    115         output.release();
    116     }
    117 
    118     private void initParameters() {
    119         float color_ratio[] = {0.21f, 0.71f, 0.07f};
    120         mProgram.setHostValue("color_ratio", color_ratio);
    121 
    122         updateParameters();
    123     }
    124 
    125     private void updateParameters() {
    126         float tint_color[] = {Color.red(mTint) / 255f,
    127                               Color.green(mTint) / 255f,
    128                               Color.blue(mTint) / 255f };
    129 
    130         mProgram.setHostValue("tint", tint_color);
    131     }
    132 
    133 }
    134