BWImage (8 bit grayscale) [1004247]

static final class BWImage extends Meta implements MakesBufferedImage, IBWImage {
  int width, height;
  byte[] pixels;

  // color returned when getPixel is called with a position outside the actual image
  float borderColor = 0.0f;
  
  // for unstructure()
  *() {}

  // BLACK!
  *(int *width, int *height) {
    pixels = new byte[width*height];
  }

  *(int *width, int *height, float brightness) {
    pixels = new byte[width*height];
    fillArrayUnlessZero(pixels, _toByte(brightness));
  }
  
  *(int *width, int *height, float[] pixels) {
    this.pixels = new byte[pixels.length];
    for (int i = 0; i < pixels.length; i++)
      this.pixels[i] = _toByte(pixels[i]);
  }

  public BWImage(int width, int height, byte[] pixels) {
    this.height = height;
    this.width = width;
    this.pixels = pixels;
  }

  public BWImage(BWImage image) {
    width = image.getWidth();
    height = image.getHeight();
    byte[] pixels = this.pixels = new byte[width*height];
    for (int y = 0; y < height; y++)
      for (int x = 0; x < width; x++)
        pixels[y*width+x] = image.getByte(x, y);
  }

  // TODO: optimize!
  *(RGBImage image) {
    width = image.getWidth();
    height = image.getHeight();
    byte[] pixels = this.pixels = new byte[height*width];
    for (int y = 0; y < height; y++)
      for (int x = 0; x < width; x++) {
        RGB rgb = image.getRGB(x, y);
        pixels[y*width+x] = BWImage._toByte(rgb.getBrightness());
      }
  }

  /*public BWImage(BufferedImage image) {
    this(new RGBImage(image));
  }*/

  *(BufferedImage image) ctex {
    width = image.getWidth();
    height = image.getHeight();
    int[] pixels = new int[width*height];
    byte[] bytePixels = this.pixels = new byte[width*height];
    PixelGrabber pixelGrabber = new PixelGrabber(image, 0, 0, width, height, pixels, 0, width);
    if (!pixelGrabber.grabPixels())
      fail("Could not grab pixels");
    int n = width*height;
    
    for (int i = 0; i < n; i++) {
      //bytePixels[i] = pixelToByte(pixels[i]);
      int packed = pixels[i];
      /*float r = ((packed >> 16) & 0xFF)/255f;
      float g = ((packed >> 8) & 0xFF)/255f;
      float b = (packed & 0xFF)/255f;
      bytePixels[i] = (byte) iround((r+g+b)/3.0f*255f);*/
      int r = ((packed >> 16) & 0xFF);
      int g = ((packed >> 8) & 0xFF);
      int b = (packed & 0xFF);
      bytePixels[i] = (byte) ((r+g+b+1)/3);
    }
  }
  
  // TODO: does it exactly match the other method? (asRGB+getBrightness+_toByte)
  static byte pixelToByte(int packed) {
    /*int r = (packed >> 16) & 0xFF;
    int g = (packed >> 8) & 0xFF;
    int b = packed & 0xFF;
    ret (byte) ((r+g+b)/3.0f);*/
    float r = ((packed >> 16) & 0xFF)/255f;
    float g = ((packed >> 8) & 0xFF)/255f;
    float b = (packed & 0xFF)/255f;
    ret (byte) ((r+g+b)/3.0f*255f);
  }

  public byte getByte(int x, int y) {
    return inRange(x, y) ? getByte_noRangeCheck(x, y) : _toByte(borderColor);
  }
  
  // pretty bad function name
  // gets brightness (0 to 255) at pixel
  public int getInt(int x, int y) {
    ret ubyteToInt(getByte(x, y));
  }
  
  // idx = index in pixel array
  public int getInt_noRangeCheck(int idx) {
    ret ubyteToInt(pixels[idx]);
  }
  
  // gets brightness (0 to 255) at pixel with default if out of image
  public int getInt(int x, int y, int defaultValue) {
    ret inRange(x, y) ? getInt(x, y) : defaultValue;
  }
  
  public double averageBrightness() {
    double sum = 0;
    int n = width*height;
    for i to n:
      sum += getInt_noRangeCheck(i);
    ret sum/n;
  }

  public float minimumBrightness() {
    float min = 1;
    for (int y = 0; y < height; y++)
      for (int x = 0; x < width; x++)
        min = Math.min(min, getPixel(x, y));
    return min;
  }

  public float maximumBrightness() {
    float max = 0;
    for (int y = 0; y < height; y++)
      for (int x = 0; x < width; x++)
        max = Math.max(max, getPixel(x, y));
    return max;
  }

  float getPixel(int x, int y) {
    return inRange(x, y) ? _toFloat(getByte(x,y )) : borderColor;
  }
  
  public float getFloatPixel(int x, int y) { ret getPixel(x, y); }
  
  float getPixel(Pt p) { ret getPixel(p.x, p.y); }

  static byte _toByte(float pixel) {
    return (byte) (pixel*255f);
  }

  static float _toFloat(byte pixel) {
    return (((int) pixel) & 255)/255f;
  }

  private boolean inRange(int x, int y) {
    return x >= 0 && x < width && y >= 0 && y < height;
  }

  public int getWidth() { return width; }
  public int getHeight() { return height; }

  public RGBImage toRGB() {
    int[] rgbs = new int[width*height];
    for (int y = 0; y < height; y++)
      for (int x = 0; x < width; x++) {
        int b = getByte(x, y) & 0xFF;
        rgbs[y*width+x] = 0xFF000000 | b*0x010101;
      }
    return new RGBImage(width, height, rgbs);
  }
  
  public RGBImage toRGB_slow() {
    RGB[] rgbs = new RGB[width*height];
    for (int y = 0; y < height; y++)
      for (int x = 0; x < width; x++) {
        float p = getPixel(x, y);
        rgbs[y*width+x] = new RGB(p, p, p);
      }
    return new RGBImage(width, height, rgbs);
  }


  public BWImage clip(int x, int y, int w, int h) {
    return clip(new Rectangle(x, y, w, h));
  }

  private Rectangle fixClipRect(Rectangle r) {
    return r.intersection(new Rectangle(0, 0, width, height));
  }

  BWImage clip(Rect r) {
    ret clip(r.getRectangle());
  }
  
  /** this should be multithread-safe */
  public BWImage clip(Rectangle r) {
    r = fixClipRect(r);
    byte[] newPixels = new byte[r.height*r.width];
    for (int y = 0; y < r.height; y++)
      for (int x = 0; x < r.width; x++)
        newPixels[y*r.width+x] = getByte(r.x+x, r.y+y);
    return new BWImage(r.width, r.height, newPixels);
  }

  public void setPixel(int x, int y, float brightness) {
    setByte(x, y, _toByte(fixPixel(brightness)));
  }
  
  // i = 0 to 255
  public void setInt(int x, int y, int i) {
    setByte(x, y, (byte) limitToUByte(i));
  }
  
  public void setInt(Pt p, int i) {
    setInt(p.x, p.y, i);
  }
  
  public void setByte(int x, int y, byte b) {
    if (x >= 0 && x < width && y >= 0 && y < height)
      pixels[y*width+x] = b;
  }

  byte getByte_noRangeCheck(int x, int y) {
    return pixels[y*width+x];
  }

  public void setByte(int x, int y, int brightness) {
    setByte(x, y, (byte) brightness);
  }

  private float fixPixel(float pixel) {
    return Math.max(0, Math.min(1, pixel));
  }

  public float getBorderColor() {
    return borderColor;
  }

  public void setBorderColor(float borderColor) {
    this.borderColor = borderColor;
  }

  public boolean anyPixelBrighterThan(double threshold) {
    for (int y = 0; y < height; y++)
      for (int x = 0; x < width; x++)
        if (getPixel(x, y) > threshold)
          return true;
    return false;
  }
  
  int[] getRGBPixels() {
    int n = width*height;
    int[] out = new[n];
    for i to n: {
      var b = ubyteToInt(pixels[i]);
      b |= (b << 8) | (b << 16);
      out[i] = b | 0xFF000000;
    }
    ret out;
  }
  
  public BufferedImage getBufferedImage() {
    ret bufferedImage(getRGBPixels(), width, height);
  }
  
  byte[] getBytes() {
    ret pixels;
  }
}

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Snippet ID:	#1004247
Snippet name:	BWImage (8 bit grayscale)
Eternal ID of this version:	#1004247/40
Text MD5:	bec097e59aadd3a79597341d9837dc8e
Transpilation MD5:	64916b5bedf5faa1a3393fbced4fb2a5
Author:	stefan
Category:	javax / imaging
Type:	JavaX fragment (include)
Public (visible to everyone):	Yes
Archived (hidden from active list):	No
Created/modified:	2022-07-21 19:02:58
Source code size:	7431 bytes / 268 lines
Pitched / IR pitched:	No / No
Views / Downloads:	1160 / 5829
Version history:	39 change(s)
Referenced in:	[show references]

< > BotCompany Repo | #1004247 // BWImage (8 bit grayscale)

JavaX fragment (include) [tags: use-pretranspiled]

1	static final class BWImage extends Meta implements MakesBufferedImage, IBWImage {
2	int width, height;
3	byte[] pixels;
4
5	// color returned when getPixel is called with a position outside the actual image
6	float borderColor = 0.0f;
7
8	// for unstructure()
9	*() {}
10
11	// BLACK!
12	(int width, int *height) {
13	pixels = new byte[width*height];
14	}
15
16	(int width, int *height, float brightness) {
17	pixels = new byte[width*height];
18	fillArrayUnlessZero(pixels, _toByte(brightness));
19	}
20
21	(int width, int *height, float[] pixels) {
22	this.pixels = new byte[pixels.length];
23	for (int i = 0; i < pixels.length; i++)
24	this.pixels[i] = _toByte(pixels[i]);
25	}
26
27	public BWImage(int width, int height, byte[] pixels) {
28	this.height = height;
29	this.width = width;
30	this.pixels = pixels;
31	}
32
33	public BWImage(BWImage image) {
34	width = image.getWidth();
35	height = image.getHeight();
36	byte[] pixels = this.pixels = new byte[width*height];
37	for (int y = 0; y < height; y++)
38	for (int x = 0; x < width; x++)
39	pixels[y*width+x] = image.getByte(x, y);
40	}
41
42	// TODO: optimize!
43	*(RGBImage image) {
44	width = image.getWidth();
45	height = image.getHeight();
46	byte[] pixels = this.pixels = new byte[height*width];
47	for (int y = 0; y < height; y++)
48	for (int x = 0; x < width; x++) {
49	RGB rgb = image.getRGB(x, y);
50	pixels[y*width+x] = BWImage._toByte(rgb.getBrightness());
51	}
52	}
53
54	/*public BWImage(BufferedImage image) {
55	this(new RGBImage(image));
56	}*/
57
58	*(BufferedImage image) ctex {
59	width = image.getWidth();
60	height = image.getHeight();
61	int[] pixels = new int[width*height];
62	byte[] bytePixels = this.pixels = new byte[width*height];
63	PixelGrabber pixelGrabber = new PixelGrabber(image, 0, 0, width, height, pixels, 0, width);
64	if (!pixelGrabber.grabPixels())
65	fail("Could not grab pixels");
66	int n = width*height;
67
68	for (int i = 0; i < n; i++) {
69	//bytePixels[i] = pixelToByte(pixels[i]);
70	int packed = pixels[i];
71	/*float r = ((packed >> 16) & 0xFF)/255f;
72	float g = ((packed >> 8) & 0xFF)/255f;
73	float b = (packed & 0xFF)/255f;
74	bytePixels[i] = (byte) iround((r+g+b)/3.0f255f);/
75	int r = ((packed >> 16) & 0xFF);
76	int g = ((packed >> 8) & 0xFF);
77	int b = (packed & 0xFF);
78	bytePixels[i] = (byte) ((r+g+b+1)/3);
79	}
80	}
81
82	// TODO: does it exactly match the other method? (asRGB+getBrightness+_toByte)
83	static byte pixelToByte(int packed) {
84	/*int r = (packed >> 16) & 0xFF;
85	int g = (packed >> 8) & 0xFF;
86	int b = packed & 0xFF;
87	ret (byte) ((r+g+b)/3.0f);*/
88	float r = ((packed >> 16) & 0xFF)/255f;
89	float g = ((packed >> 8) & 0xFF)/255f;
90	float b = (packed & 0xFF)/255f;
91	ret (byte) ((r+g+b)/3.0f*255f);
92	}
93
94	public byte getByte(int x, int y) {
95	return inRange(x, y) ? getByte_noRangeCheck(x, y) : _toByte(borderColor);
96	}
97
98	// pretty bad function name
99	// gets brightness (0 to 255) at pixel
100	public int getInt(int x, int y) {
101	ret ubyteToInt(getByte(x, y));
102	}
103
104	// idx = index in pixel array
105	public int getInt_noRangeCheck(int idx) {
106	ret ubyteToInt(pixels[idx]);
107	}
108
109	// gets brightness (0 to 255) at pixel with default if out of image
110	public int getInt(int x, int y, int defaultValue) {
111	ret inRange(x, y) ? getInt(x, y) : defaultValue;
112	}
113
114	public double averageBrightness() {
115	double sum = 0;
116	int n = width*height;
117	for i to n:
118	sum += getInt_noRangeCheck(i);
119	ret sum/n;
120	}
121
122	public float minimumBrightness() {
123	float min = 1;
124	for (int y = 0; y < height; y++)
125	for (int x = 0; x < width; x++)
126	min = Math.min(min, getPixel(x, y));
127	return min;
128	}
129
130	public float maximumBrightness() {
131	float max = 0;
132	for (int y = 0; y < height; y++)
133	for (int x = 0; x < width; x++)
134	max = Math.max(max, getPixel(x, y));
135	return max;
136	}
137
138	float getPixel(int x, int y) {
139	return inRange(x, y) ? _toFloat(getByte(x,y )) : borderColor;
140	}
141
142	public float getFloatPixel(int x, int y) { ret getPixel(x, y); }
143
144	float getPixel(Pt p) { ret getPixel(p.x, p.y); }
145
146	static byte _toByte(float pixel) {
147	return (byte) (pixel*255f);
148	}
149
150	static float _toFloat(byte pixel) {
151	return (((int) pixel) & 255)/255f;
152	}
153
154	private boolean inRange(int x, int y) {
155	return x >= 0 && x < width && y >= 0 && y < height;
156	}
157
158	public int getWidth() { return width; }
159	public int getHeight() { return height; }
160
161	public RGBImage toRGB() {
162	int[] rgbs = new int[width*height];
163	for (int y = 0; y < height; y++)
164	for (int x = 0; x < width; x++) {
165	int b = getByte(x, y) & 0xFF;
166	rgbs[ywidth+x] = 0xFF000000 \| b0x010101;
167	}
168	return new RGBImage(width, height, rgbs);
169	}
170
171	public RGBImage toRGB_slow() {
172	RGB[] rgbs = new RGB[width*height];
173	for (int y = 0; y < height; y++)
174	for (int x = 0; x < width; x++) {
175	float p = getPixel(x, y);
176	rgbs[y*width+x] = new RGB(p, p, p);
177	}
178	return new RGBImage(width, height, rgbs);
179	}
180
181
182	public BWImage clip(int x, int y, int w, int h) {
183	return clip(new Rectangle(x, y, w, h));
184	}
185
186	private Rectangle fixClipRect(Rectangle r) {
187	return r.intersection(new Rectangle(0, 0, width, height));
188	}
189
190	BWImage clip(Rect r) {
191	ret clip(r.getRectangle());
192	}
193
194	/** this should be multithread-safe */
195	public BWImage clip(Rectangle r) {
196	r = fixClipRect(r);
197	byte[] newPixels = new byte[r.height*r.width];
198	for (int y = 0; y < r.height; y++)
199	for (int x = 0; x < r.width; x++)
200	newPixels[y*r.width+x] = getByte(r.x+x, r.y+y);
201	return new BWImage(r.width, r.height, newPixels);
202	}
203
204	public void setPixel(int x, int y, float brightness) {
205	setByte(x, y, _toByte(fixPixel(brightness)));
206	}
207
208	// i = 0 to 255
209	public void setInt(int x, int y, int i) {
210	setByte(x, y, (byte) limitToUByte(i));
211	}
212
213	public void setInt(Pt p, int i) {
214	setInt(p.x, p.y, i);
215	}
216
217	public void setByte(int x, int y, byte b) {
218	if (x >= 0 && x < width && y >= 0 && y < height)
219	pixels[y*width+x] = b;
220	}
221
222	byte getByte_noRangeCheck(int x, int y) {
223	return pixels[y*width+x];
224	}
225
226	public void setByte(int x, int y, int brightness) {
227	setByte(x, y, (byte) brightness);
228	}
229
230	private float fixPixel(float pixel) {
231	return Math.max(0, Math.min(1, pixel));
232	}
233
234	public float getBorderColor() {
235	return borderColor;
236	}
237
238	public void setBorderColor(float borderColor) {
239	this.borderColor = borderColor;
240	}
241
242	public boolean anyPixelBrighterThan(double threshold) {
243	for (int y = 0; y < height; y++)
244	for (int x = 0; x < width; x++)
245	if (getPixel(x, y) > threshold)
246	return true;
247	return false;
248	}
249
250	int[] getRGBPixels() {
251	int n = width*height;
252	int[] out = new[n];
253	for i to n: {
254	var b = ubyteToInt(pixels[i]);
255	b \|= (b << 8) \| (b << 16);
256	out[i] = b \| 0xFF000000;
257	}
258	ret out;
259	}
260
261	public BufferedImage getBufferedImage() {
262	ret bufferedImage(getRGBPixels(), width, height);
263	}
264
265	byte[] getBytes() {
266	ret pixels;
267	}
268	}