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
17package android.filterpacks.imageproc;
18
19import android.filterfw.core.Filter;
20import android.filterfw.core.FilterContext;
21import android.filterfw.core.Frame;
22import android.filterfw.core.FrameFormat;
23import android.filterfw.core.GenerateFieldPort;
24import android.filterfw.core.KeyValueMap;
25import android.filterfw.core.NativeProgram;
26import android.filterfw.core.NativeFrame;
27import android.filterfw.core.Program;
28import android.filterfw.core.ShaderProgram;
29import android.filterfw.format.ImageFormat;
30import android.graphics.Color;
31
32public 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