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 DuotoneFilter extends Filter {
33
34    @GenerateFieldPort(name = "first_color", hasDefault = true)
35    private int mFirstColor = 0xFFFF0000;
36
37    @GenerateFieldPort(name = "second_color", hasDefault = true)
38    private int mSecondColor = 0xFFFFFF00;
39
40    @GenerateFieldPort(name = "tile_size", hasDefault = true)
41    private int mTileSize = 640;
42
43    private Program mProgram;
44    private int mTarget = FrameFormat.TARGET_UNSPECIFIED;
45
46    private final String mDuotoneShader =
47            "precision mediump float;\n" +
48            "uniform sampler2D tex_sampler_0;\n" +
49            "uniform vec3 first;\n" +
50            "uniform vec3 second;\n" +
51            "varying vec2 v_texcoord;\n" +
52            "void main() {\n" +
53            "  vec4 color = texture2D(tex_sampler_0, v_texcoord);\n" +
54            "  float energy = (color.r + color.g + color.b) * 0.3333;\n" +
55            "  vec3 new_color = (1.0 - energy) * first + energy * second;\n" +
56            "  gl_FragColor = vec4(new_color.rgb, color.a);\n" +
57            "}\n";
58
59    public DuotoneFilter(String name) {
60      super(name);
61    }
62
63    @Override
64    public void setupPorts() {
65        addMaskedInputPort("image", ImageFormat.create(ImageFormat.COLORSPACE_RGBA));
66        addOutputBasedOnInput("image", "image");
67    }
68
69    @Override
70    public FrameFormat getOutputFormat(String portName, FrameFormat inputFormat) {
71        return inputFormat;
72    }
73
74    public void initProgram(FilterContext context, int target) {
75        switch (target) {
76            case FrameFormat.TARGET_GPU:
77                ShaderProgram shaderProgram = new ShaderProgram(context, mDuotoneShader);
78                shaderProgram.setMaximumTileSize(mTileSize);
79                mProgram = shaderProgram;
80                break;
81
82            default:
83                throw new RuntimeException("Filter Duotone does not support frames of " +
84                    "target " + target + "!");
85        }
86        mTarget = target;
87    }
88
89    @Override
90    public void process(FilterContext context) {
91        // Get input frame
92        Frame input = pullInput("image");
93        FrameFormat inputFormat = input.getFormat();
94
95        // Create output frame
96        Frame output = context.getFrameManager().newFrame(inputFormat);
97
98        // Create program if not created already
99        if (mProgram == null || inputFormat.getTarget() != mTarget) {
100            initProgram(context, inputFormat.getTarget());
101        }
102        updateParameters();
103
104        // Process
105        mProgram.process(input, output);
106
107        // Push output
108        pushOutput("image", output);
109
110        // Release pushed frame
111        output.release();
112    }
113
114    private void updateParameters() {
115        float first[] = { Color.red(mFirstColor)/255f,
116                Color.green(mFirstColor)/255f,
117                Color.blue(mFirstColor)/255f };
118        float second[] = { Color.red(mSecondColor)/255f,
119                Color.green(mSecondColor)/255f,
120                Color.blue(mSecondColor)/255f };
121
122        mProgram.setHostValue("first", first);
123        mProgram.setHostValue("second", second);
124    }
125}
126