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 PosterizeFilter extends Filter {
32
33    @GenerateFieldPort(name = "tile_size", hasDefault = true)
34    private int mTileSize = 640;
35
36    private Program mProgram;
37    private int mTarget = FrameFormat.TARGET_UNSPECIFIED;
38
39    private final String mPosterizeShader =
40            "precision mediump float;\n" +
41            "uniform sampler2D tex_sampler_0;\n" +
42            "varying vec2 v_texcoord;\n" +
43            "void main() {\n" +
44            "  vec4 color = texture2D(tex_sampler_0, v_texcoord);\n" +
45            "  vec3 pcolor;\n" +
46            "  pcolor.r = (color.r >= 0.5) ? 0.75 : 0.25;\n" +
47            "  pcolor.g = (color.g >= 0.5) ? 0.75 : 0.25;\n" +
48            "  pcolor.b = (color.b >= 0.5) ? 0.75 : 0.25;\n" +
49            "  gl_FragColor = vec4(pcolor, color.a);\n" +
50            "}\n";
51
52    public PosterizeFilter(String name) {
53      super(name);
54    }
55
56    @Override
57    public void setupPorts() {
58        addMaskedInputPort("image", ImageFormat.create(ImageFormat.COLORSPACE_RGBA));
59        addOutputBasedOnInput("image", "image");
60    }
61
62    @Override
63    public FrameFormat getOutputFormat(String portName, FrameFormat inputFormat) {
64        return inputFormat;
65    }
66
67    public void initProgram(FilterContext context, int target) {
68        switch (target) {
69            case FrameFormat.TARGET_GPU:
70                ShaderProgram shaderProgram = new ShaderProgram(context, mPosterizeShader);
71                shaderProgram.setMaximumTileSize(mTileSize);
72                mProgram = shaderProgram;
73                break;
74
75            default:
76                throw new RuntimeException("Filter Sharpen does not support frames of " +
77                    "target " + target + "!");
78        }
79        mTarget = target;
80    }
81
82    @Override
83    public void process(FilterContext context) {
84        // Get input frame
85        Frame input = pullInput("image");
86        FrameFormat inputFormat = input.getFormat();
87
88        // Create output frame
89        Frame output = context.getFrameManager().newFrame(inputFormat);
90
91        // Create program if not created already
92        if (mProgram == null || inputFormat.getTarget() != mTarget) {
93            initProgram(context, inputFormat.getTarget());
94        }
95
96        // Process
97        mProgram.process(input, output);
98
99        // Push output
100        pushOutput("image", output);
101
102        // Release pushed frame
103        output.release();
104    }
105
106}
107