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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.GenerateFinalPort;
     25 import android.filterfw.core.KeyValueMap;
     26 import android.filterfw.core.NativeProgram;
     27 import android.filterfw.core.NativeFrame;
     28 import android.filterfw.core.Program;
     29 import android.filterfw.core.ShaderProgram;
     30 import android.filterfw.format.ImageFormat;
     31 
     32 import android.util.Log;
     33 
     34 public class FillLightFilter extends Filter {
     35 
     36     @GenerateFieldPort(name = "tile_size", hasDefault = true)
     37     private int mTileSize = 640;
     38 
     39     @GenerateFieldPort(name = "strength", hasDefault = true)
     40     private float mBacklight = 0f;
     41 
     42     private Program mProgram;
     43 
     44     private int mTarget = FrameFormat.TARGET_UNSPECIFIED;
     45 
     46     private final String mFillLightShader =
     47             "precision mediump float;\n" +
     48             "uniform sampler2D tex_sampler_0;\n" +
     49             "uniform float mult;\n" +
     50             "uniform float igamma;\n" +
     51             "varying vec2 v_texcoord;\n" +
     52             "void main()\n" +
     53             "{\n" +
     54             "  const vec3 color_weights = vec3(0.25, 0.5, 0.25);\n" +
     55             "  vec4 color = texture2D(tex_sampler_0, v_texcoord);\n" +
     56             "  float lightmask = dot(color.rgb, color_weights);\n" +
     57             "  float backmask = (1.0 - lightmask);\n" +
     58             "  vec3 ones = vec3(1.0, 1.0, 1.0);\n" +
     59             "  vec3 diff = pow(mult * color.rgb, igamma * ones) - color.rgb;\n" +
     60             "  diff = min(diff, 1.0);\n" +
     61             "  vec3 new_color = min(color.rgb + diff * backmask, 1.0);\n" +
     62             "  gl_FragColor = vec4(new_color, color.a);\n" +
     63             "}\n";
     64 
     65     public FillLightFilter(String name) {
     66       super(name);
     67     }
     68 
     69     @Override
     70     public void setupPorts() {
     71         addMaskedInputPort("image", ImageFormat.create(ImageFormat.COLORSPACE_RGBA));
     72         addOutputBasedOnInput("image", "image");
     73     }
     74 
     75     @Override
     76     public FrameFormat getOutputFormat(String portName, FrameFormat inputFormat) {
     77         return inputFormat;
     78     }
     79 
     80     public void initProgram(FilterContext context, int target) {
     81         switch (target) {
     82             case FrameFormat.TARGET_GPU:
     83                 ShaderProgram shaderProgram = new ShaderProgram(context, mFillLightShader);
     84                 Log.e("FillLight", "tile size: " + mTileSize);
     85                 shaderProgram.setMaximumTileSize(mTileSize);
     86                 mProgram = shaderProgram;
     87                 break;
     88 
     89             default:
     90                 throw new RuntimeException("Filter FillLight does not support frames of " +
     91                     "target " + target + "!");
     92         }
     93         mTarget = target;
     94     }
     95 
     96 
     97     @Override
     98     public void process(FilterContext context) {
     99         // Get input frame
    100         Frame input = pullInput("image");
    101         FrameFormat inputFormat = input.getFormat();
    102 
    103         // Create output frame
    104         Frame output = context.getFrameManager().newFrame(inputFormat);
    105 
    106         // Create program if not created already
    107         if (mProgram == null || inputFormat.getTarget() != mTarget) {
    108             initProgram(context, inputFormat.getTarget());
    109             updateParameters();
    110         }
    111 
    112         // Process
    113         mProgram.process(input, output);
    114 
    115         // Push output
    116         pushOutput("image", output);
    117 
    118         // Release pushed frame
    119         output.release();
    120     }
    121 
    122 
    123     @Override
    124     public void fieldPortValueUpdated(String name, FilterContext context) {
    125         if (mProgram != null) {
    126             updateParameters();
    127         }
    128     }
    129 
    130     private void updateParameters() {
    131         float fade_gamma = 0.3f;
    132         float amt = 1.0f - mBacklight;
    133         float mult = 1.0f / (amt * 0.7f + 0.3f);
    134         float faded = fade_gamma + (1.0f -fade_gamma) *mult;
    135         float igamma = 1.0f / faded;
    136 
    137         mProgram.setHostValue("mult", mult);
    138         mProgram.setHostValue("igamma", igamma);
    139     }
    140 }
    141