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.MutableFrameFormat;
25import android.filterfw.core.Program;
26import android.filterfw.core.ShaderProgram;
27import android.filterfw.format.ImageFormat;
28import android.filterfw.geometry.Point;
29import android.filterfw.geometry.Quad;
30
31/**
32 * The FixedRotationFilter rotates the input image clockwise, it only accepts
33 * 4 rotation angles: 0, 90, 180, 270
34 * @hide
35 */
36public class FixedRotationFilter extends Filter {
37
38    @GenerateFieldPort(name = "rotation", hasDefault = true)
39    private int mRotation = 0;
40
41    private ShaderProgram mProgram = null;
42
43    public FixedRotationFilter(String name) {
44        super(name);
45    }
46
47    @Override
48    public void setupPorts() {
49        addMaskedInputPort("image", ImageFormat.create(ImageFormat.COLORSPACE_RGBA,
50                                                       FrameFormat.TARGET_GPU));
51        addOutputBasedOnInput("image", "image");
52    }
53
54    @Override
55    public FrameFormat getOutputFormat(String portName, FrameFormat inputFormat) {
56        return inputFormat;
57    }
58
59    @Override
60    public void process(FilterContext context) {
61        Frame input = pullInput("image");
62        if (mRotation == 0) {
63            pushOutput("image", input);
64            return;
65        }
66        FrameFormat inputFormat = input.getFormat();
67
68        // Create program if not created already
69        if (mProgram == null) {
70            mProgram = ShaderProgram.createIdentity(context);
71        }
72        MutableFrameFormat outputFormat = inputFormat.mutableCopy();
73        int width = inputFormat.getWidth();
74        int height = inputFormat.getHeight();
75        Point p1 = new Point(0.0f, 0.0f);
76        Point p2 = new Point(1.0f, 0.0f);
77        Point p3 = new Point(0.0f, 1.0f);
78        Point p4 = new Point(1.0f, 1.0f);
79        Quad sourceRegion;
80        switch (((int)Math.round(mRotation / 90f)) % 4) {
81            case 1:
82                sourceRegion = new Quad(p3,p1,p4,p2);
83                outputFormat.setDimensions(height, width);
84                break;
85            case 2:
86                sourceRegion = new Quad(p4,p3,p2,p1);
87                break;
88            case 3:
89                sourceRegion = new Quad(p2,p4,p1,p3);
90                outputFormat.setDimensions(height, width);
91                break;
92            case 0:
93            default:
94                sourceRegion = new Quad(p1,p2,p3,p4);
95                break;
96        }
97        // Create output frame
98        Frame output = context.getFrameManager().newFrame(outputFormat);
99
100        // Set the source region
101        mProgram.setSourceRegion(sourceRegion);
102
103        // Process
104        mProgram.process(input, output);
105
106        // Push output
107        pushOutput("image", output);
108
109        // Release pushed frame
110        output.release();
111    }
112}
113