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
|
/*
* 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 java.util.Date;
import java.util.Random;
public class BlackWhiteFilter extends Filter {
@GenerateFieldPort(name = "black", hasDefault = true)
private float mBlack = 0f;
@GenerateFieldPort(name = "white", hasDefault = true)
private float mWhite = 1f;
@GenerateFieldPort(name = "tile_size", hasDefault = true)
private int mTileSize = 640;
private Program mProgram;
private Random mRandom;
private int mTarget = FrameFormat.TARGET_UNSPECIFIED;
private final String mBlackWhiteShader =
"precision mediump float;\n" +
"uniform sampler2D tex_sampler_0;\n" +
"uniform vec2 seed;\n" +
"uniform float black;\n" +
"uniform float scale;\n" +
"uniform float stepsize;\n" +
"varying vec2 v_texcoord;\n" +
"float rand(vec2 loc) {\n" +
" const float divide = 0.00048828125;\n" +
" const float factor = 2048.0;\n" +
" float value = sin(dot(loc, vec2(12.9898, 78.233)));\n" +
" float residual = mod(dot(mod(loc, divide), vec2(0.9898, 0.233)), divide);\n" +
" float part2 = mod(value, divide);\n" +
" float part1 = value - part2;\n" +
" return fract(0.5453 * part1 + factor * (part2 + residual));\n" +
"}\n" +
"void main() {\n" +
" vec4 color = texture2D(tex_sampler_0, v_texcoord);\n" +
" float dither = rand(v_texcoord + seed);\n" +
" vec3 xform = clamp((color.rgb - black) * scale, 0.0, 1.0);\n" +
" vec3 temp = clamp((color.rgb + stepsize - black) * scale, 0.0, 1.0);\n" +
" vec3 new_color = clamp(xform + (temp - xform) * (dither - 0.5), 0.0, 1.0);\n" +
" gl_FragColor = vec4(new_color, color.a);\n" +
"}\n";
public BlackWhiteFilter(String name) {
super(name);
mRandom = new Random(new Date().getTime());
}
@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, mBlackWhiteShader);
shaderProgram.setMaximumTileSize(mTileSize);
mProgram = shaderProgram;
updateParameters();
break;
default:
throw new RuntimeException("Filter Sharpen does not support frames of " +
"target " + target + "!");
}
mTarget = target;
}
private void updateParameters() {
float scale = (mBlack != mWhite) ? 1.0f / (mWhite - mBlack) : 2000f;
float stepsize = 1.0f / 255.0f;
mProgram.setHostValue("black", mBlack);
mProgram.setHostValue("scale", scale);
mProgram.setHostValue("stepsize", stepsize);
float seed[] = { mRandom.nextFloat(), mRandom.nextFloat() };
mProgram.setHostValue("seed", seed);
}
@Override
public void fieldPortValueUpdated(String name, FilterContext context) {
if (mProgram != null) {
updateParameters();
}
}
@Override
public void process(FilterContext context) {
// Get input frame
Frame input = pullInput("image");
FrameFormat inputFormat = input.getFormat();
// Create program if not created already
if (mProgram == null || inputFormat.getTarget() != mTarget) {
initProgram(context, inputFormat.getTarget());
}
// Create output frame
Frame output = context.getFrameManager().newFrame(inputFormat);
// Process
mProgram.process(input, output);
// Push output
pushOutput("image", output);
// Release pushed frame
output.release();
}
}
|
