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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.util.Log;
     31 
     32 public class ColorTemperatureFilter extends Filter {
     33 
     34     @GenerateFieldPort(name = "scale", hasDefault = true)
     35     private float mScale = 0.5f;
     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 mColorTemperatureShader =
     44             "precision mediump float;\n" +
     45             "uniform sampler2D tex_sampler_0;\n" +
     46             "uniform float scale;\n" +
     47             "varying vec2 v_texcoord;\n" +
     48             "void main() {\n" +
     49             "  vec4 color = texture2D(tex_sampler_0, v_texcoord);\n" +
     50             "  vec3 new_color = color.rgb;\n" +
     51             "  new_color.r = color.r + color.r * ( 1.0 - color.r) * scale;\n" +
     52             "  new_color.b = color.b - color.b * ( 1.0 - color.b) * scale;\n" +
     53             "  if (scale > 0.0) { \n" +
     54             "    new_color.g = color.g + color.g * ( 1.0 - color.g) * scale * 0.25;\n" +
     55             "  }\n" +
     56             "  float max_value = max(new_color.r, max(new_color.g, new_color.b));\n" +
     57             "  if (max_value > 1.0) { \n" +
     58             "     new_color /= max_value;\n" +
     59             "  } \n" +
     60             "  gl_FragColor = vec4(new_color, color.a);\n" +
     61             "}\n";
     62 
     63     public ColorTemperatureFilter(String name) {
     64         super(name);
     65     }
     66 
     67     @Override
     68     public void setupPorts() {
     69         addMaskedInputPort("image", ImageFormat.create(ImageFormat.COLORSPACE_RGBA));
     70         addOutputBasedOnInput("image", "image");
     71     }
     72 
     73     @Override
     74     public FrameFormat getOutputFormat(String portName, FrameFormat inputFormat) {
     75         return inputFormat;
     76     }
     77 
     78     public void initProgram(FilterContext context, int target) {
     79         switch (target) {
     80             case FrameFormat.TARGET_GPU:
     81                 ShaderProgram shaderProgram = new ShaderProgram(context, mColorTemperatureShader);
     82                 shaderProgram.setMaximumTileSize(mTileSize);
     83                 mProgram = shaderProgram;
     84                 break;
     85 
     86             default:
     87                 throw new RuntimeException("Filter Sharpen does not support frames of " +
     88                     "target " + target + "!");
     89         }
     90         mTarget = target;
     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             updateParameters();
    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 updateParameters() {
    119         mProgram.setHostValue("scale", 2.0f * mScale - 1.0f);
    120     }
    121 
    122     @Override
    123     public void fieldPortValueUpdated(String name, FilterContext context) {
    124         if (mProgram != null) {
    125             updateParameters();
    126         }
    127     }
    128 }
    129