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
17
18package android.filterpacks.imageproc;
19
20import android.filterfw.core.Filter;
21import android.filterfw.core.FilterContext;
22import android.filterfw.core.Frame;
23import android.filterfw.core.FrameFormat;
24import android.filterfw.core.GenerateFieldPort;
25import android.filterfw.core.KeyValueMap;
26import android.filterfw.core.MutableFrameFormat;
27import android.filterfw.core.NativeProgram;
28import android.filterfw.core.NativeFrame;
29import android.filterfw.core.Program;
30import android.filterfw.core.ShaderProgram;
31import android.filterfw.format.ImageFormat;
32import android.filterfw.geometry.Quad;
33import android.filterfw.geometry.Point;
34import android.util.Log;
35
36/**
37 * @hide
38 */
39public class RotateFilter extends Filter {
40
41    @GenerateFieldPort(name = "angle")
42    private int mAngle;
43
44    @GenerateFieldPort(name = "tile_size", hasDefault = true)
45    private int mTileSize = 640;
46
47    private Program mProgram;
48
49    private int mWidth = 0;
50    private int mHeight = 0;
51    private int mTarget = FrameFormat.TARGET_UNSPECIFIED;
52
53    private int mOutputWidth;
54    private int mOutputHeight;
55
56    public RotateFilter(String name) {
57        super(name);
58    }
59
60    @Override
61    public void setupPorts() {
62        addMaskedInputPort("image", ImageFormat.create(ImageFormat.COLORSPACE_RGBA));
63        addOutputBasedOnInput("image", "image");
64    }
65
66    public void initProgram(FilterContext context, int target) {
67        switch (target) {
68            case FrameFormat.TARGET_GPU:
69                ShaderProgram shaderProgram = ShaderProgram.createIdentity(context);
70                shaderProgram.setMaximumTileSize(mTileSize);
71                shaderProgram.setClearsOutput(true);
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 fieldPortValueUpdated(String name, FilterContext context) {
84        if (mProgram != null) {
85            updateParameters();
86        }
87    }
88
89    @Override
90    public void process(FilterContext context) {
91        // Get input frame
92        Frame input = pullInput("image");
93        FrameFormat inputFormat = input.getFormat();
94
95        // Create program if not created already
96        if (mProgram == null || inputFormat.getTarget() != mTarget) {
97            initProgram(context, inputFormat.getTarget());
98        }
99
100        if (inputFormat.getWidth() != mWidth || inputFormat.getHeight() != mHeight) {
101            mWidth = inputFormat.getWidth();
102            mHeight = inputFormat.getHeight();
103            mOutputWidth = mWidth;
104            mOutputHeight = mHeight;
105
106            updateParameters();
107        }
108
109        // Create output frame
110        FrameFormat outputFormat = ImageFormat.create(mOutputWidth, mOutputHeight,
111                                                      ImageFormat.COLORSPACE_RGBA,
112                                                      FrameFormat.TARGET_GPU);
113
114        Frame output = context.getFrameManager().newFrame(outputFormat);
115
116        // Process
117        mProgram.process(input, output);
118
119        // Push output
120        pushOutput("image", output);
121
122        // Release pushed frame
123        output.release();
124    }
125
126    private void updateParameters() {
127        float sinTheta;
128        float cosTheta;
129
130        if (mAngle % 90 == 0) {
131            if (mAngle % 180 == 0) {
132                sinTheta = 0f;
133                cosTheta = (mAngle % 360 == 0) ? 1f:-1f;
134            } else {
135                cosTheta = 0f;
136                sinTheta = ((mAngle + 90) % 360 == 0) ? -1f:1f;
137
138                mOutputWidth = mHeight;
139                mOutputHeight = mWidth;
140            }
141        } else {
142            throw new RuntimeException("degree has to be multiply of 90.");
143        }
144
145        Point x0 = new Point(0.5f * (-cosTheta + sinTheta + 1f),
146                             0.5f * (-sinTheta - cosTheta + 1f));
147        Point x1 = new Point(0.5f * (cosTheta + sinTheta + 1f),
148                             0.5f * (sinTheta - cosTheta + 1f));
149        Point x2 = new Point(0.5f * (-cosTheta - sinTheta + 1f),
150                             0.5f * (-sinTheta + cosTheta + 1f));
151        Point x3 = new Point(0.5f * (cosTheta - sinTheta + 1f),
152                             0.5f * (sinTheta + cosTheta + 1f));
153        Quad quad = new Quad(x0, x1, x2, x3);
154        ((ShaderProgram) mProgram).setTargetRegion(quad);
155    }
156}
157