PixelUtils [1024654]

/*
Copyright 2006 Jerry Huxtable

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.
*/

/**
 * Some more useful math functions for image processing.
 * These are becoming obsolete as we move to Java2D. Use MiscComposite instead.
 */
sclass PixelUtils {
  public final static int REPLACE = 0;
  public final static int NORMAL = 1;
  public final static int MIN = 2;
  public final static int MAX = 3;
  public final static int ADD = 4;
  public final static int SUBTRACT = 5;
  public final static int DIFFERENCE = 6;
  public final static int MULTIPLY = 7;
  public final static int HUE = 8;
  public final static int SATURATION = 9;
  public final static int VALUE = 10;
  public final static int COLOR = 11;
  public final static int SCREEN = 12;
  public final static int AVERAGE = 13;
  public final static int OVERLAY = 14;
  public final static int CLEAR = 15;
  public final static int EXCHANGE = 16;
  public final static int DISSOLVE = 17;
  public final static int DST_IN = 18;
  public final static int ALPHA = 19;
  public final static int ALPHA_TO_GRAY = 20;

  private static Random randomGenerator = new Random();

  /**
   * Clamp a value to the range 0..255
   */
  static int _clamp(int c) {
    if (c < 0)
      return 0;
    if (c > 255)
      return 255;
    return c;
  }

  public static int interpolate(int v1, int v2, float f) {
    return _clamp((int)(v1+f*(v2-v1)));
  }
  
  public static int brightness(int rgb) {
    int r = (rgb >> 16) & 0xff;
    int g = (rgb >> 8) & 0xff;
    int b = rgb & 0xff;
    return (r+g+b)/3;
  }
  
  public static boolean nearColors(int rgb1, int rgb2, int tolerance) {
    int r1 = (rgb1 >> 16) & 0xff;
    int g1 = (rgb1 >> 8) & 0xff;
    int b1 = rgb1 & 0xff;
    int r2 = (rgb2 >> 16) & 0xff;
    int g2 = (rgb2 >> 8) & 0xff;
    int b2 = rgb2 & 0xff;
    return Math.abs(r1-r2) <= tolerance && Math.abs(g1-g2) <= tolerance && Math.abs(b1-b2) <= tolerance;
  }
  
  private final static float hsb1[] = new float[3];//FIXME-not thread safe
  private final static float hsb2[] = new float[3];//FIXME-not thread safe
  
  // Return rgb1 painted onto rgb2
  public static int combinePixels(int rgb1, int rgb2, int op) {
    return combinePixels(rgb1, rgb2, op, 0xff);
  }
  
  public static int combinePixels(int rgb1, int rgb2, int op, int extraAlpha, int channelMask) {
    return (rgb2 & ~channelMask) | combinePixels(rgb1 & channelMask, rgb2, op, extraAlpha);
  }
  
  public static int combinePixels(int rgb1, int rgb2, int op, int extraAlpha) {
    if (op == REPLACE)
      return rgb1;
    int a1 = (rgb1 >> 24) & 0xff;
    int r1 = (rgb1 >> 16) & 0xff;
    int g1 = (rgb1 >> 8) & 0xff;
    int b1 = rgb1 & 0xff;
    int a2 = (rgb2 >> 24) & 0xff;
    int r2 = (rgb2 >> 16) & 0xff;
    int g2 = (rgb2 >> 8) & 0xff;
    int b2 = rgb2 & 0xff;

    switch (op) {
    case NORMAL:
      break;
    case MIN:
      r1 = Math.min(r1, r2);
      g1 = Math.min(g1, g2);
      b1 = Math.min(b1, b2);
      break;
    case MAX:
      r1 = Math.max(r1, r2);
      g1 = Math.max(g1, g2);
      b1 = Math.max(b1, b2);
      break;
    case ADD:
      r1 = _clamp(r1+r2);
      g1 = _clamp(g1+g2);
      b1 = _clamp(b1+b2);
      break;
    case SUBTRACT:
      r1 = _clamp(r2-r1);
      g1 = _clamp(g2-g1);
      b1 = _clamp(b2-b1);
      break;
    case DIFFERENCE:
      r1 = _clamp(Math.abs(r1-r2));
      g1 = _clamp(Math.abs(g1-g2));
      b1 = _clamp(Math.abs(b1-b2));
      break;
    case MULTIPLY:
      r1 = _clamp(r1*r2/255);
      g1 = _clamp(g1*g2/255);
      b1 = _clamp(b1*b2/255);
      break;
    case DISSOLVE:
      if ((randomGenerator.nextInt() & 0xff) <= a1) {
        r1 = r2;
        g1 = g2;
        b1 = b2;
      }
      break;
    case AVERAGE:
      r1 = (r1+r2)/2;
      g1 = (g1+g2)/2;
      b1 = (b1+b2)/2;
      break;
    case HUE:
    case SATURATION:
    case VALUE:
    case COLOR:
      Color.RGBtoHSB(r1, g1, b1, hsb1);
      Color.RGBtoHSB(r2, g2, b2, hsb2);
      switch (op) {
      case HUE:
        hsb2[0] = hsb1[0];
        break;
      case SATURATION:
        hsb2[1] = hsb1[1];
        break;
      case VALUE:
        hsb2[2] = hsb1[2];
        break;
      case COLOR:
        hsb2[0] = hsb1[0];
        hsb2[1] = hsb1[1];
        break;
      }
      rgb1 = Color.HSBtoRGB(hsb2[0], hsb2[1], hsb2[2]);
      r1 = (rgb1 >> 16) & 0xff;
      g1 = (rgb1 >> 8) & 0xff;
      b1 = rgb1 & 0xff;
      break;
    case SCREEN:
      r1 = 255 - ((255 - r1) * (255 - r2)) / 255;
      g1 = 255 - ((255 - g1) * (255 - g2)) / 255;
      b1 = 255 - ((255 - b1) * (255 - b2)) / 255;
      break;
    case OVERLAY:
      int m, s;
      s = 255 - ((255 - r1) * (255 - r2)) / 255;
      m = r1 * r2 / 255;
      r1 = (s * r1 + m * (255 - r1)) / 255;
      s = 255 - ((255 - g1) * (255 - g2)) / 255;
      m = g1 * g2 / 255;
      g1 = (s * g1 + m * (255 - g1)) / 255;
      s = 255 - ((255 - b1) * (255 - b2)) / 255;
      m = b1 * b2 / 255;
      b1 = (s * b1 + m * (255 - b1)) / 255;
      break;
    case CLEAR:
      r1 = g1 = b1 = 0xff;
      break;
    case DST_IN:
      r1 = _clamp((r2*a1)/255);
      g1 = _clamp((g2*a1)/255);
      b1 = _clamp((b2*a1)/255);
      a1 = _clamp((a2*a1)/255);
      return (a1 << 24) | (r1 << 16) | (g1 << 8) | b1;
    case ALPHA:
      a1 = a1*a2/255;
      return (a1 << 24) | (r2 << 16) | (g2 << 8) | b2;
    case ALPHA_TO_GRAY:
      int na = 255-a1;
      return (a1 << 24) | (na << 16) | (na << 8) | na;
    }
    if (extraAlpha != 0xff || a1 != 0xff) {
      a1 = a1*extraAlpha/255;
      int a3 = (255-a1)*a2/255;
      r1 = _clamp((r1*a1+r2*a3)/255);
      g1 = _clamp((g1*a1+g2*a3)/255);
      b1 = _clamp((b1*a1+b2*a3)/255);
      a1 = _clamp(a1+a3);
    }
    return (a1 << 24) | (r1 << 16) | (g1 << 8) | b1;
  }

}

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Snippet ID:	#1024654
Snippet name:	PixelUtils
Eternal ID of this version:	#1024654/2
Text MD5:	4c34676ad22a3a5ae087549799f714f0
Author:	stefan
Category:	javax / imaging
Type:	JavaX fragment (include)
Public (visible to everyone):	Yes
Archived (hidden from active list):	No
Created/modified:	2019-08-22 00:48:00
Source code size:	6445 bytes / 217 lines
Pitched / IR pitched:	No / No
Views / Downloads:	187 / 547
Version history:	1 change(s)
Referenced in:	[show references]

1	/*
2	Copyright 2006 Jerry Huxtable
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	/**
18	* Some more useful math functions for image processing.
19	* These are becoming obsolete as we move to Java2D. Use MiscComposite instead.
20	*/
21	sclass PixelUtils {
22	public final static int REPLACE = 0;
23	public final static int NORMAL = 1;
24	public final static int MIN = 2;
25	public final static int MAX = 3;
26	public final static int ADD = 4;
27	public final static int SUBTRACT = 5;
28	public final static int DIFFERENCE = 6;
29	public final static int MULTIPLY = 7;
30	public final static int HUE = 8;
31	public final static int SATURATION = 9;
32	public final static int VALUE = 10;
33	public final static int COLOR = 11;
34	public final static int SCREEN = 12;
35	public final static int AVERAGE = 13;
36	public final static int OVERLAY = 14;
37	public final static int CLEAR = 15;
38	public final static int EXCHANGE = 16;
39	public final static int DISSOLVE = 17;
40	public final static int DST_IN = 18;
41	public final static int ALPHA = 19;
42	public final static int ALPHA_TO_GRAY = 20;
43
44	private static Random randomGenerator = new Random();
45
46	/**
47	* Clamp a value to the range 0..255
48	*/
49	static int _clamp(int c) {
50	if (c < 0)
51	return 0;
52	if (c > 255)
53	return 255;
54	return c;
55	}
56
57	public static int interpolate(int v1, int v2, float f) {
58	return _clamp((int)(v1+f*(v2-v1)));
59	}
60
61	public static int brightness(int rgb) {
62	int r = (rgb >> 16) & 0xff;
63	int g = (rgb >> 8) & 0xff;
64	int b = rgb & 0xff;
65	return (r+g+b)/3;
66	}
67
68	public static boolean nearColors(int rgb1, int rgb2, int tolerance) {
69	int r1 = (rgb1 >> 16) & 0xff;
70	int g1 = (rgb1 >> 8) & 0xff;
71	int b1 = rgb1 & 0xff;
72	int r2 = (rgb2 >> 16) & 0xff;
73	int g2 = (rgb2 >> 8) & 0xff;
74	int b2 = rgb2 & 0xff;
75	return Math.abs(r1-r2) <= tolerance && Math.abs(g1-g2) <= tolerance && Math.abs(b1-b2) <= tolerance;
76	}
77
78	private final static float hsb1[] = new float[3];//FIXME-not thread safe
79	private final static float hsb2[] = new float[3];//FIXME-not thread safe
80
81	// Return rgb1 painted onto rgb2
82	public static int combinePixels(int rgb1, int rgb2, int op) {
83	return combinePixels(rgb1, rgb2, op, 0xff);
84	}
85
86	public static int combinePixels(int rgb1, int rgb2, int op, int extraAlpha, int channelMask) {
87	return (rgb2 & ~channelMask) \| combinePixels(rgb1 & channelMask, rgb2, op, extraAlpha);
88	}
89
90	public static int combinePixels(int rgb1, int rgb2, int op, int extraAlpha) {
91	if (op == REPLACE)
92	return rgb1;
93	int a1 = (rgb1 >> 24) & 0xff;
94	int r1 = (rgb1 >> 16) & 0xff;
95	int g1 = (rgb1 >> 8) & 0xff;
96	int b1 = rgb1 & 0xff;
97	int a2 = (rgb2 >> 24) & 0xff;
98	int r2 = (rgb2 >> 16) & 0xff;
99	int g2 = (rgb2 >> 8) & 0xff;
100	int b2 = rgb2 & 0xff;
101
102	switch (op) {
103	case NORMAL:
104	break;
105	case MIN:
106	r1 = Math.min(r1, r2);
107	g1 = Math.min(g1, g2);
108	b1 = Math.min(b1, b2);
109	break;
110	case MAX:
111	r1 = Math.max(r1, r2);
112	g1 = Math.max(g1, g2);
113	b1 = Math.max(b1, b2);
114	break;
115	case ADD:
116	r1 = _clamp(r1+r2);
117	g1 = _clamp(g1+g2);
118	b1 = _clamp(b1+b2);
119	break;
120	case SUBTRACT:
121	r1 = _clamp(r2-r1);
122	g1 = _clamp(g2-g1);
123	b1 = _clamp(b2-b1);
124	break;
125	case DIFFERENCE:
126	r1 = _clamp(Math.abs(r1-r2));
127	g1 = _clamp(Math.abs(g1-g2));
128	b1 = _clamp(Math.abs(b1-b2));
129	break;
130	case MULTIPLY:
131	r1 = _clamp(r1*r2/255);
132	g1 = _clamp(g1*g2/255);
133	b1 = _clamp(b1*b2/255);
134	break;
135	case DISSOLVE:
136	if ((randomGenerator.nextInt() & 0xff) <= a1) {
137	r1 = r2;
138	g1 = g2;
139	b1 = b2;
140	}
141	break;
142	case AVERAGE:
143	r1 = (r1+r2)/2;
144	g1 = (g1+g2)/2;
145	b1 = (b1+b2)/2;
146	break;
147	case HUE:
148	case SATURATION:
149	case VALUE:
150	case COLOR:
151	Color.RGBtoHSB(r1, g1, b1, hsb1);
152	Color.RGBtoHSB(r2, g2, b2, hsb2);
153	switch (op) {
154	case HUE:
155	hsb2[0] = hsb1[0];
156	break;
157	case SATURATION:
158	hsb2[1] = hsb1[1];
159	break;
160	case VALUE:
161	hsb2[2] = hsb1[2];
162	break;
163	case COLOR:
164	hsb2[0] = hsb1[0];
165	hsb2[1] = hsb1[1];
166	break;
167	}
168	rgb1 = Color.HSBtoRGB(hsb2[0], hsb2[1], hsb2[2]);
169	r1 = (rgb1 >> 16) & 0xff;
170	g1 = (rgb1 >> 8) & 0xff;
171	b1 = rgb1 & 0xff;
172	break;
173	case SCREEN:
174	r1 = 255 - ((255 - r1) * (255 - r2)) / 255;
175	g1 = 255 - ((255 - g1) * (255 - g2)) / 255;
176	b1 = 255 - ((255 - b1) * (255 - b2)) / 255;
177	break;
178	case OVERLAY:
179	int m, s;
180	s = 255 - ((255 - r1) * (255 - r2)) / 255;
181	m = r1 * r2 / 255;
182	r1 = (s * r1 + m * (255 - r1)) / 255;
183	s = 255 - ((255 - g1) * (255 - g2)) / 255;
184	m = g1 * g2 / 255;
185	g1 = (s * g1 + m * (255 - g1)) / 255;
186	s = 255 - ((255 - b1) * (255 - b2)) / 255;
187	m = b1 * b2 / 255;
188	b1 = (s * b1 + m * (255 - b1)) / 255;
189	break;
190	case CLEAR:
191	r1 = g1 = b1 = 0xff;
192	break;
193	case DST_IN:
194	r1 = _clamp((r2*a1)/255);
195	g1 = _clamp((g2*a1)/255);
196	b1 = _clamp((b2*a1)/255);
197	a1 = _clamp((a2*a1)/255);
198	return (a1 << 24) \| (r1 << 16) \| (g1 << 8) \| b1;
199	case ALPHA:
200	a1 = a1*a2/255;
201	return (a1 << 24) \| (r2 << 16) \| (g2 << 8) \| b2;
202	case ALPHA_TO_GRAY:
203	int na = 255-a1;
204	return (a1 << 24) \| (na << 16) \| (na << 8) \| na;
205	}
206	if (extraAlpha != 0xff \|\| a1 != 0xff) {
207	a1 = a1*extraAlpha/255;
208	int a3 = (255-a1)*a2/255;
209	r1 = _clamp((r1a1+r2a3)/255);
210	g1 = _clamp((g1a1+g2a3)/255);
211	b1 = _clamp((b1a1+b2a3)/255);
212	a1 = _clamp(a1+a3);
213	}
214	return (a1 << 24) \| (r1 << 16) \| (g1 << 8) \| b1;
215	}
216
217	}

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JavaX fragment (include)