59 * Constructs a GrayFilter object that filters a color image to a
60 * grayscale image. Used by buttons to create disabled ("grayed out")
61 * button images.
62 *
63 * @param b a boolean -- true if the pixels should be brightened
64 * @param p an int in the range 0..100 that determines the percentage
65 * of gray, where 100 is the darkest gray, and 0 is the lightest
66 */
67 public GrayFilter(boolean b, int p) {
68 brighter = b;
69 percent = p;
70
71 // canFilterIndexColorModel indicates whether or not it is acceptable
72 // to apply the color filtering of the filterRGB method to the color
73 // table entries of an IndexColorModel object in lieu of pixel by pixel
74 // filtering.
75 canFilterIndexColorModel = true;
76 }
77
78 /**
79 * Overrides <code>RGBImageFilter.filterRGB</code>.
80 */
81 public int filterRGB(int x, int y, int rgb) {
82 // Use NTSC conversion formula.
83 int gray = (int)((0.30 * ((rgb >> 16) & 0xff) +
84 0.59 * ((rgb >> 8) & 0xff) +
85 0.11 * (rgb & 0xff)) / 3);
86
87 if (brighter) {
88 gray = (255 - ((255 - gray) * (100 - percent) / 100));
89 } else {
90 gray = (gray * (100 - percent) / 100);
91 }
92
93 if (gray < 0) gray = 0;
94 if (gray > 255) gray = 255;
95 return (rgb & 0xff000000) | (gray << 16) | (gray << 8) | (gray << 0);
96 }
97 }
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59 * Constructs a GrayFilter object that filters a color image to a
60 * grayscale image. Used by buttons to create disabled ("grayed out")
61 * button images.
62 *
63 * @param b a boolean -- true if the pixels should be brightened
64 * @param p an int in the range 0..100 that determines the percentage
65 * of gray, where 100 is the darkest gray, and 0 is the lightest
66 */
67 public GrayFilter(boolean b, int p) {
68 brighter = b;
69 percent = p;
70
71 // canFilterIndexColorModel indicates whether or not it is acceptable
72 // to apply the color filtering of the filterRGB method to the color
73 // table entries of an IndexColorModel object in lieu of pixel by pixel
74 // filtering.
75 canFilterIndexColorModel = true;
76 }
77
78 /**
79 * Overrides {@code RGBImageFilter.filterRGB}.
80 */
81 public int filterRGB(int x, int y, int rgb) {
82 // Use NTSC conversion formula.
83 int gray = (int)((0.30 * ((rgb >> 16) & 0xff) +
84 0.59 * ((rgb >> 8) & 0xff) +
85 0.11 * (rgb & 0xff)) / 3);
86
87 if (brighter) {
88 gray = (255 - ((255 - gray) * (100 - percent) / 100));
89 } else {
90 gray = (gray * (100 - percent) / 100);
91 }
92
93 if (gray < 0) gray = 0;
94 if (gray > 255) gray = 255;
95 return (rgb & 0xff000000) | (gray << 16) | (gray << 8) | (gray << 0);
96 }
97 }
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