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.Set;
32
33public class SharpenFilter extends Filter {
34
35    @GenerateFieldPort(name = "scale", hasDefault = true)
36    private float mScale = 0f;
37
38    @GenerateFieldPort(name = "tile_size", hasDefault = true)
39    private int mTileSize = 640;
40
41    private Program mProgram;
42
43    private int mWidth = 0;
44    private int mHeight = 0;
45    private int mTarget = FrameFormat.TARGET_UNSPECIFIED;
46
47    private final String mSharpenShader =
48            "precision mediump float;\n" +
49            "uniform sampler2D tex_sampler_0;\n" +
50            "uniform float scale;\n" +
51            "uniform float stepsizeX;\n" +
52            "uniform float stepsizeY;\n" +
53            "varying vec2 v_texcoord;\n" +
54            "void main() {\n" +
55            "  vec3 nbr_color = vec3(0.0, 0.0, 0.0);\n" +
56            "  vec2 coord;\n" +
57            "  vec4 color = texture2D(tex_sampler_0, v_texcoord);\n" +
58            "  coord.x = v_texcoord.x - 0.5 * stepsizeX;\n" +
59            "  coord.y = v_texcoord.y - stepsizeY;\n" +
60            "  nbr_color += texture2D(tex_sampler_0, coord).rgb - color.rgb;\n" +
61            "  coord.x = v_texcoord.x - stepsizeX;\n" +
62            "  coord.y = v_texcoord.y + 0.5 * stepsizeY;\n" +
63            "  nbr_color += texture2D(tex_sampler_0, coord).rgb - color.rgb;\n" +
64            "  coord.x = v_texcoord.x + stepsizeX;\n" +
65            "  coord.y = v_texcoord.y - 0.5 * stepsizeY;\n" +
66            "  nbr_color += texture2D(tex_sampler_0, coord).rgb - color.rgb;\n" +
67            "  coord.x = v_texcoord.x + stepsizeX;\n" +
68            "  coord.y = v_texcoord.y + 0.5 * stepsizeY;\n" +
69            "  nbr_color += texture2D(tex_sampler_0, coord).rgb - color.rgb;\n" +
70            "  gl_FragColor = vec4(color.rgb - 2.0 * scale * nbr_color, color.a);\n" +
71            "}\n";
72
73    public SharpenFilter(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, mSharpenShader);
92                shaderProgram.setMaximumTileSize(mTileSize);
93                mProgram = shaderProgram;
94                break;
95
96            default:
97                throw new RuntimeException("Filter Sharpen does not support frames of " +
98                    "target " + target + "!");
99        }
100        mTarget = target;
101    }
102
103    @Override
104    public void process(FilterContext context) {
105        // Get input frame
106        Frame input = pullInput("image");
107        FrameFormat inputFormat = input.getFormat();
108
109        // Create output frame
110        Frame output = context.getFrameManager().newFrame(inputFormat);
111
112        // Create program if not created already
113        if (mProgram == null || inputFormat.getTarget() != mTarget) {
114            initProgram(context, inputFormat.getTarget());
115        }
116
117        // Check if the frame size has changed
118        if (inputFormat.getWidth() != mWidth || inputFormat.getHeight() != mHeight) {
119            updateFrameSize(inputFormat.getWidth(), inputFormat.getHeight());
120        }
121
122        // Process
123        mProgram.process(input, output);
124
125        // Push output
126        pushOutput("image", output);
127
128        // Release pushed frame
129        output.release();
130    }
131
132    private void updateFrameSize(int width, int height) {
133        mWidth = width;
134        mHeight = height;
135
136        if (mProgram != null) {
137            mProgram.setHostValue("stepsizeX", 1.0f / mWidth);
138            mProgram.setHostValue("stepsizeY", 1.0f / mHeight);
139            updateParameters();
140        }
141    }
142
143    private void updateParameters() {
144        mProgram.setHostValue("scale", mScale);
145    }
146
147    @Override
148    public void fieldPortValueUpdated(String name, FilterContext context) {
149        if (mProgram != null) {
150            updateParameters();
151        }
152    }
153}
154