1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
|
/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.filterpacks.imageproc;
import android.filterfw.core.Filter;
import android.filterfw.core.FilterContext;
import android.filterfw.core.Frame;
import android.filterfw.core.FrameFormat;
import android.filterfw.core.GenerateFieldPort;
import android.filterfw.core.KeyValueMap;
import android.filterfw.core.NativeProgram;
import android.filterfw.core.NativeFrame;
import android.filterfw.core.Program;
import android.filterfw.core.ShaderProgram;
import android.filterfw.format.ImageFormat;
import android.util.Log;
import java.lang.Math;
import java.util.Set;
/**
* @hide
*/
public class FisheyeFilter extends Filter {
private static final String TAG = "FisheyeFilter";
// This parameter has range between 0 and 1. It controls the effect of radial distortion.
// The larger the value, the more prominent the distortion effect becomes (a straight line
// becomes a curve).
@GenerateFieldPort(name = "scale", hasDefault = true)
private float mScale = 0f;
@GenerateFieldPort(name = "tile_size", hasDefault = true)
private int mTileSize = 640;
private Program mProgram;
private int mWidth = 0;
private int mHeight = 0;
private int mTarget = FrameFormat.TARGET_UNSPECIFIED;
private static final String mFisheyeShader =
"precision mediump float;\n" +
"uniform sampler2D tex_sampler_0;\n" +
"uniform vec2 center;\n" +
"uniform float alpha;\n" +
"uniform float bound;\n" +
"uniform float radius2;\n" +
"uniform float factor;\n" +
"uniform float inv_height;\n" +
"uniform float inv_width;\n" +
"varying vec2 v_texcoord;\n" +
"void main() {\n" +
" const float m_pi_2 = 1.570963;\n" +
" float dist = distance(gl_FragCoord.xy, center);\n" +
" float radian = m_pi_2 - atan(alpha * sqrt(radius2 - dist * dist), dist);\n" +
" float scale = radian * factor / dist;\n" +
" vec2 new_coord = gl_FragCoord.xy * scale + (1.0 - scale) * center;\n" +
" new_coord.x *= inv_width;\n" +
" new_coord.y *= inv_height;\n" +
" vec4 color = texture2D(tex_sampler_0, new_coord);\n" +
" gl_FragColor = color;\n" +
"}\n";
public FisheyeFilter(String name) {
super(name);
}
@Override
public void setupPorts() {
addMaskedInputPort("image", ImageFormat.create(ImageFormat.COLORSPACE_RGBA));
addOutputBasedOnInput("image", "image");
}
@Override
public FrameFormat getOutputFormat(String portName, FrameFormat inputFormat) {
return inputFormat;
}
public void initProgram(FilterContext context, int target) {
switch (target) {
case FrameFormat.TARGET_GPU:
ShaderProgram shaderProgram = new ShaderProgram(context, mFisheyeShader);
shaderProgram.setMaximumTileSize(mTileSize);
mProgram = shaderProgram;
break;
default:
throw new RuntimeException("Filter FisheyeFilter does not support frames of " +
"target " + target + "!");
}
mTarget = target;
}
@Override
public void process(FilterContext context) {
// Get input frame
Frame input = pullInput("image");
FrameFormat inputFormat = input.getFormat();
// Create output frame
Frame output = context.getFrameManager().newFrame(inputFormat);
// Create program if not created already
if (mProgram == null || inputFormat.getTarget() != mTarget) {
initProgram(context, inputFormat.getTarget());
}
// Check if the frame size has changed
if (inputFormat.getWidth() != mWidth || inputFormat.getHeight() != mHeight) {
updateFrameSize(inputFormat.getWidth(), inputFormat.getHeight());
}
// Process
mProgram.process(input, output);
// Push output
pushOutput("image", output);
// Release pushed frame
output.release();
}
@Override
public void fieldPortValueUpdated(String name, FilterContext context) {
if (mProgram != null) {
updateProgramParams();
}
}
private void updateFrameSize(int width, int height) {
float center[] = {0.5f * width, 0.5f * height};
mProgram.setHostValue("center", center);
mProgram.setHostValue("inv_width", 1.0f / width);
mProgram.setHostValue("inv_height", 1.0f / height);
mWidth = width;
mHeight = height;
updateProgramParams();
}
private void updateProgramParams() {
final float pi = 3.14159265f;
float alpha = mScale * 2.0f + 0.75f;
float bound2 = 0.25f * (mWidth * mWidth + mHeight * mHeight);
float bound = (float) Math.sqrt(bound2);
float radius = 1.15f * bound;
float radius2 = radius * radius;
float max_radian = 0.5f * pi -
(float) Math.atan(alpha / bound * (float) Math.sqrt(radius2 - bound2));
float factor = bound / max_radian;
mProgram.setHostValue("radius2",radius2);
mProgram.setHostValue("factor", factor);
mProgram.setHostValue("alpha", (float) (mScale * 2.0 + 0.75));
}
}
|
