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