DocumentaryFilter.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
31import java.util.Random;
32
33public class DocumentaryFilter extends Filter {
34
35    @GenerateFieldPort(name = "tile_size", hasDefault = true)
36    private int mTileSize = 640;
37
38    private Program mProgram;
39
40    private int mWidth = 0;
41    private int mHeight = 0;
42    private int mTarget = FrameFormat.TARGET_UNSPECIFIED;
43
44    private Frame mNoiseFrame;
45    private Random mRandom;
46
47    private final String mDocumentaryShader =
48            "precision mediump float;\n" +
49            "uniform sampler2D tex_sampler_0;\n" +
50            "uniform sampler2D tex_sampler_1;\n" +
51            "uniform float stepsize;\n" +
52            "uniform float inv_max_dist;\n" +
53            "uniform vec2 center;\n" +
54            "varying vec2 v_texcoord;\n" +
55            "void main() {\n" +
56            // black white
57            "  vec4 color = texture2D(tex_sampler_0, v_texcoord);\n" +
58            "  float dither = texture2D(tex_sampler_1, v_texcoord).r;\n" +
59            "  vec3 xform = clamp(2.0 * color.rgb, 0.0, 1.0);\n" +
60            "  vec3 temp = clamp(2.0 * (color.rgb + stepsize), 0.0, 1.0);\n" +
61            "  vec3 new_color = clamp(xform + (temp - xform) * (dither - 0.5), 0.0, 1.0);\n" +
62            // grayscale
63            "  float gray = dot(new_color, vec3(0.299, 0.587, 0.114));\n" +
64            "  new_color = vec3(gray, gray, gray);\n" +
65            // vignette
66            "  float dist = distance(gl_FragCoord.xy, center);\n" +
67            "  float lumen = 0.85 / (1.0 + exp((dist * inv_max_dist - 0.83) * 20.0)) + 0.15;\n" +
68            "  gl_FragColor = vec4(new_color * lumen, color.a);\n" +
69            "}\n";
70
71    public DocumentaryFilter(String name) {
72        super(name);
73
74        mRandom = new Random();
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    @Override
89    public void tearDown(FilterContext context) {
90        if (mNoiseFrame != null) {
91            mNoiseFrame.release();
92            mNoiseFrame = null;
93        }
94    }
95
96    public void initProgram(FilterContext context, int target) {
97        switch (target) {
98            case FrameFormat.TARGET_GPU:
99                ShaderProgram shaderProgram = new ShaderProgram(context, mDocumentaryShader);
100                shaderProgram.setMaximumTileSize(mTileSize);
101                mProgram = shaderProgram;
102                break;
103
104            default:
105                throw new RuntimeException("Filter Sharpen does not support frames of " +
106                    "target " + target + "!");
107        }
108        mTarget = target;
109    }
110
111    @Override
112    public void process(FilterContext context) {
113        // Get input frame
114        Frame input = pullInput("image");
115        FrameFormat inputFormat = input.getFormat();
116
117        // Create program if not created already
118        if (mProgram == null || inputFormat.getTarget() != mTarget) {
119            initProgram(context, inputFormat.getTarget());
120        }
121
122        // Check if the frame size has changed
123        if (inputFormat.getWidth() != mWidth || inputFormat.getHeight() != mHeight) {
124            mWidth = inputFormat.getWidth();
125            mHeight = inputFormat.getHeight();
126
127            int[] buffer = new int[mWidth * mHeight];
128            for (int i = 0; i < mWidth * mHeight; ++i) {
129              buffer[i] = mRandom.nextInt(255);
130            }
131            FrameFormat format = ImageFormat.create(mWidth, mHeight,
132                                                    ImageFormat.COLORSPACE_RGBA,
133                                                    FrameFormat.TARGET_GPU);
134            if (mNoiseFrame != null) {
135                mNoiseFrame.release();
136            }
137            mNoiseFrame = context.getFrameManager().newFrame(format);
138            mNoiseFrame.setInts(buffer);
139
140            initParameters();
141        }
142
143        if (mNoiseFrame != null && (mNoiseFrame.getFormat().getWidth() != mWidth ||
144                                    mNoiseFrame.getFormat().getHeight() != mHeight)) {
145            throw new RuntimeException("Random map and imput image size mismatch!");
146        }
147
148        // Create output frame
149        Frame output = context.getFrameManager().newFrame(inputFormat);
150
151        // Process
152        Frame[] inputs = {input, mNoiseFrame};
153        mProgram.process(inputs, output);
154
155        // Push output
156        pushOutput("image", output);
157
158        // Release pushed frame
159        output.release();
160    }
161
162    private void initParameters() {
163        if (mProgram != null) {
164            float centerX = (float) (0.5 * mWidth);
165            float centerY = (float) (0.5 * mHeight);
166            float center[] = {centerX, centerY};
167            float max_dist = (float) Math.sqrt(centerX * centerX + centerY * centerY);
168
169            mProgram.setHostValue("center", center);
170            mProgram.setHostValue("inv_max_dist", 1.0f / max_dist);
171            mProgram.setHostValue("stepsize", 1.0f / 255.0f);
172        }
173    }
174
175}
176