SaturateFilter.java revision 65953da4636fbf5f0a24b8f5f2b5fa7d76ff13d9 
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;
30
31public 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