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;
27
28public class SepiaFilter extends Filter {
29
30    @GenerateFieldPort(name = "tile_size", hasDefault = true)
31    private int mTileSize = 640;
32
33    private Program mProgram;
34    private int mTarget = FrameFormat.TARGET_UNSPECIFIED;
35
36    private final String mSepiaShader =
37            "precision mediump float;\n" +
38            "uniform sampler2D tex_sampler_0;\n" +
39            "uniform mat3 matrix;\n" +
40            "varying vec2 v_texcoord;\n" +
41            "void main() {\n" +
42            "  vec4 color = texture2D(tex_sampler_0, v_texcoord);\n" +
43            "  vec3 new_color = min(matrix * color.rgb, 1.0);\n" +
44            "  gl_FragColor = vec4(new_color.rgb, color.a);\n" +
45            "}\n";
46
47    public SepiaFilter(String name) {
48      super(name);
49    }
50
51    @Override
52    public void setupPorts() {
53        addMaskedInputPort("image", ImageFormat.create(ImageFormat.COLORSPACE_RGBA));
54        addOutputBasedOnInput("image", "image");
55    }
56
57    @Override
58    public FrameFormat getOutputFormat(String portName, FrameFormat inputFormat) {
59        return inputFormat;
60    }
61
62    public void initProgram(FilterContext context, int target) {
63        switch (target) {
64            case FrameFormat.TARGET_GPU:
65                ShaderProgram shaderProgram = new ShaderProgram(context, mSepiaShader);
66                shaderProgram.setMaximumTileSize(mTileSize);
67                mProgram = shaderProgram;
68                break;
69
70            default:
71                throw new RuntimeException("Filter Sharpen does not support frames of " +
72                    "target " + target + "!");
73        }
74        mTarget = target;
75    }
76
77   @Override
78    public void process(FilterContext context) {
79        // Get input frame
80        Frame input = pullInput("image");
81        FrameFormat inputFormat = input.getFormat();
82
83        // Create output frame
84        Frame output = context.getFrameManager().newFrame(inputFormat);
85
86        // Create program if not created already
87        if (mProgram == null || inputFormat.getTarget() != mTarget) {
88            initProgram(context, inputFormat.getTarget());
89            initParameters();
90        }
91
92        // Process
93        mProgram.process(input, output);
94
95        // Push output
96        pushOutput("image", output);
97
98        // Release pushed frame
99        output.release();
100    }
101
102    private void initParameters() {
103        float weights[] = { 805.0f / 2048.0f, 715.0f / 2048.0f, 557.0f / 2048.0f,
104                            1575.0f / 2048.0f, 1405.0f / 2048.0f, 1097.0f / 2048.0f,
105                            387.0f / 2048.0f, 344.0f / 2048.0f, 268.0f / 2048.0f };
106        mProgram.setHostValue("matrix", weights);
107    }
108}
109