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.Program;
25import android.filterfw.core.ShaderProgram;
26import android.filterfw.format.ImageFormat;
27import android.graphics.Color;
28
29public class DuotoneFilter extends Filter {
30
31    @GenerateFieldPort(name = "first_color", hasDefault = true)
32    private int mFirstColor = 0xFFFF0000;
33
34    @GenerateFieldPort(name = "second_color", hasDefault = true)
35    private int mSecondColor = 0xFFFFFF00;
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 mDuotoneShader =
44            "precision mediump float;\n" +
45            "uniform sampler2D tex_sampler_0;\n" +
46            "uniform vec3 first;\n" +
47            "uniform vec3 second;\n" +
48            "varying vec2 v_texcoord;\n" +
49            "void main() {\n" +
50            "  vec4 color = texture2D(tex_sampler_0, v_texcoord);\n" +
51            "  float energy = (color.r + color.g + color.b) * 0.3333;\n" +
52            "  vec3 new_color = (1.0 - energy) * first + energy * second;\n" +
53            "  gl_FragColor = vec4(new_color.rgb, color.a);\n" +
54            "}\n";
55
56    public DuotoneFilter(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, mDuotoneShader);
75                shaderProgram.setMaximumTileSize(mTileSize);
76                mProgram = shaderProgram;
77                break;
78
79            default:
80                throw new RuntimeException("Filter Duotone does not support frames of " +
81                    "target " + target + "!");
82        }
83        mTarget = target;
84    }
85
86    @Override
87    public void process(FilterContext context) {
88        // Get input frame
89        Frame input = pullInput("image");
90        FrameFormat inputFormat = input.getFormat();
91
92        // Create output frame
93        Frame output = context.getFrameManager().newFrame(inputFormat);
94
95        // Create program if not created already
96        if (mProgram == null || inputFormat.getTarget() != mTarget) {
97            initProgram(context, inputFormat.getTarget());
98        }
99        updateParameters();
100
101        // Process
102        mProgram.process(input, output);
103
104        // Push output
105        pushOutput("image", output);
106
107        // Release pushed frame
108        output.release();
109    }
110
111    private void updateParameters() {
112        float first[] = { Color.red(mFirstColor)/255f,
113                Color.green(mFirstColor)/255f,
114                Color.blue(mFirstColor)/255f };
115        float second[] = { Color.red(mSecondColor)/255f,
116                Color.green(mSecondColor)/255f,
117                Color.blue(mSecondColor)/255f };
118
119        mProgram.setHostValue("first", first);
120        mProgram.setHostValue("second", second);
121    }
122}
123