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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 
     31 public class SaturateFilter extends Filter {
     32 
     33     @GenerateFieldPort(name = "scale", hasDefault = true)
     34     private float mScale = 0f;
     35 
     36     @GenerateFieldPort(name = "tile_size", hasDefault = true)
     37     private int mTileSize = 640;
     38 
     39     private Program mBenProgram;
     40     private Program mHerfProgram;
     41     private int mTarget = FrameFormat.TARGET_UNSPECIFIED;
     42 
     43     private final String mBenSaturateShader =
     44             "precision mediump float;\n" +
     45             "uniform sampler2D tex_sampler_0;\n" +
     46             "uniform float scale;\n" +
     47             "uniform float shift;\n" +
     48             "uniform vec3 weights;\n" +
     49             "varying vec2 v_texcoord;\n" +
     50             "void main() {\n" +
     51             "  vec4 color = texture2D(tex_sampler_0, v_texcoord);\n" +
     52             "  float kv = dot(color.rgb, weights) + shift;\n" +
     53             "  vec3 new_color = scale * color.rgb + (1.0 - scale) * kv;\n" +
     54             "  gl_FragColor = vec4(new_color, color.a);\n" +
     55             "}\n";
     56 
     57     private final String mHerfSaturateShader =
     58             "precision mediump float;\n" +
     59             "uniform sampler2D tex_sampler_0;\n" +
     60             "uniform vec3 weights;\n" +
     61             "uniform vec3 exponents;\n" +
     62             "varying vec2 v_texcoord;\n" +
     63             "void main() {\n" +
     64             "  vec4 color = texture2D(tex_sampler_0, v_texcoord);\n" +
     65             "  float de = dot(color.rgb, weights);\n" +
     66             "  float inv_de = 1.0 / de;\n" +
     67             "  vec3 new_color = de * pow(color.rgb * inv_de, exponents);\n" +
     68             "  float max_color = max(max(max(new_color.r, new_color.g), new_color.b), 1.0);\n" +
     69             "  gl_FragColor = vec4(new_color / max_color, color.a);\n" +
     70             "}\n";
     71 
     72 
     73     public SaturateFilter(String name) {
     74         super(name);
     75     }
     76 
     77     @Override
     78     public void setupPorts() {
     79         addMaskedInputPort("image", ImageFormat.create(ImageFormat.COLORSPACE_RGBA));
     80         addOutputBasedOnInput("image", "image");
     81     }
     82 
     83     @Override
     84     public FrameFormat getOutputFormat(String portName, FrameFormat inputFormat) {
     85         return inputFormat;
     86     }
     87 
     88     public void initProgram(FilterContext context, int target) {
     89         switch (target) {
     90             case FrameFormat.TARGET_GPU:
     91                 ShaderProgram shaderProgram = new ShaderProgram(context, mBenSaturateShader);
     92                 shaderProgram.setMaximumTileSize(mTileSize);
     93                 mBenProgram = shaderProgram;
     94 
     95                 shaderProgram = new ShaderProgram(context, mHerfSaturateShader);
     96                 shaderProgram.setMaximumTileSize(mTileSize);
     97                 mHerfProgram = shaderProgram;
     98 
     99                 break;
    100 
    101             default:
    102                 throw new RuntimeException("Filter Sharpen does not support frames of " +
    103                     "target " + target + "!");
    104         }
    105         mTarget = target;
    106     }
    107 
    108     @Override
    109     public void fieldPortValueUpdated(String name, FilterContext context) {
    110         if (mBenProgram != null && mHerfProgram != null) {
    111             updateParameters();
    112         }
    113     }
    114 
    115     @Override
    116     public void process(FilterContext context) {
    117         // Get input frame
    118         Frame input = pullInput("image");
    119         FrameFormat inputFormat = input.getFormat();
    120 
    121         // Create program if not created already
    122         if (mBenProgram == null || inputFormat.getTarget() != mTarget) {
    123             initProgram(context, inputFormat.getTarget());
    124             initParameters();
    125         }
    126 
    127         // Create output frame
    128         Frame output = context.getFrameManager().newFrame(inputFormat);
    129 
    130         // Process
    131         if (mScale > 0.0f) {
    132             mHerfProgram.process(input, output);
    133         } else {
    134             mBenProgram.process(input, output);
    135         }
    136          // Push output
    137         pushOutput("image", output);
    138 
    139         // Release pushed frame
    140         output.release();
    141     }
    142 
    143     private void initParameters() {
    144         float shift = 1.0f / 255.0f;
    145         float weights[] = { 2f/8f, 5f/8f, 1f/8f};
    146 
    147         mBenProgram.setHostValue("weights", weights);
    148         mBenProgram.setHostValue("shift", shift);
    149 
    150         mHerfProgram.setHostValue("weights", weights);
    151 
    152         updateParameters();
    153     }
    154 
    155     private void updateParameters() {
    156 
    157         if (mScale > 0.0f) {
    158             float exponents[] = new float[3];
    159 
    160             exponents[0] = (0.9f * mScale) + 1.0f;
    161             exponents[1] = (2.1f * mScale) + 1.0f;
    162             exponents[2] = (2.7f * mScale) + 1.0f;
    163 
    164             mHerfProgram.setHostValue("exponents", exponents);
    165         } else {
    166             mBenProgram.setHostValue("scale", 1.0f + mScale);
    167         }
    168     }
    169 
    170 }
    171