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-rw-r--r--src/main/java/Color.java82
1 files changed, 65 insertions, 17 deletions
diff --git a/src/main/java/Color.java b/src/main/java/Color.java
index 9e05039..49a6618 100644
--- a/src/main/java/Color.java
+++ b/src/main/java/Color.java
@@ -4,6 +4,40 @@
4 */ 4 */
5public final class Color { 5public final class Color {
6 6
7 public static final int BYTE_MASK = 0b11111111;
8 public static final float DECIMAL_NORMALIZER = 255.0f;
9
10 public static final int RED_SHIFT = 16;
11 public static final int GREEN_SHIFT = 8;
12 public static final int BLUE_SHIFT = 0;
13
14 /**
15 * Returns shifted component from given packed color.
16 *
17 * @param rgb 32-bits RGB color
18 * @param shift binary shift
19 * @return a float between 0.0 and 1.0
20 * @see #getRGBValue
21 */
22 private static float getNormalizedRGBComponent(int rgb, int shift) {
23 return ((float) (rgb >> shift & BYTE_MASK)) / DECIMAL_NORMALIZER;
24 }
25
26 /**
27 * Returns RGB binary value from given component and color shift.
28 *
29 * @param component a float between 0.0 and 1.0
30 * @param shift binary shift
31 * @return 32-bits RGB color
32 * @see #getNormalizedRGBComponent
33 */
34 private static int getRGBValue(float component, int shift) {
35 if (component < 0.0f) component = 0.0f;
36 if (component > 1.0f) component = 1.0f;
37
38 return ((int) (component * DECIMAL_NORMALIZER) & BYTE_MASK) << shift;
39 }
40
7 /** 41 /**
8 * Returns red component from given packed color. 42 * Returns red component from given packed color.
9 * 43 *
@@ -14,8 +48,7 @@ public final class Color {
14 * @see #getRGB(float, float, float) 48 * @see #getRGB(float, float, float)
15 */ 49 */
16 public static float getRed(int rgb) { 50 public static float getRed(int rgb) {
17 // TODO getRed 51 return Color.getNormalizedRGBComponent(rgb, RED_SHIFT);
18 return 0.0f;
19 } 52 }
20 53
21 /** 54 /**
@@ -28,8 +61,7 @@ public final class Color {
28 * @see #getRGB(float, float, float) 61 * @see #getRGB(float, float, float)
29 */ 62 */
30 public static float getGreen(int rgb) { 63 public static float getGreen(int rgb) {
31 // TODO getGreen 64 return Color.getNormalizedRGBComponent(rgb, GREEN_SHIFT);
32 return 0.0f;
33 } 65 }
34 66
35 /** 67 /**
@@ -42,8 +74,7 @@ public final class Color {
42 * @see #getRGB(float, float, float) 74 * @see #getRGB(float, float, float)
43 */ 75 */
44 public static float getBlue(int rgb) { 76 public static float getBlue(int rgb) {
45 // TODO getBlue 77 return Color.getNormalizedRGBComponent(rgb, BLUE_SHIFT);
46 return 0.0f;
47 } 78 }
48 79
49 /** 80 /**
@@ -57,8 +88,7 @@ public final class Color {
57 * @see #getRGB(float) 88 * @see #getRGB(float)
58 */ 89 */
59 public static float getGray(int rgb) { 90 public static float getGray(int rgb) {
60 // TODO getGray 91 return (Color.getRed(rgb) + Color.getGreen(rgb) + Color.getBlue(rgb)) / 3.0f;
61 return 0.0f;
62 } 92 }
63 93
64 /** 94 /**
@@ -73,20 +103,22 @@ public final class Color {
73 * @see #getBlue 103 * @see #getBlue
74 */ 104 */
75 public static int getRGB(float red, float green, float blue) { 105 public static int getRGB(float red, float green, float blue) {
76 // TODO getRGB 106 int rgbValue = 0b0;
77 return 0; 107 rgbValue |= Color.getRGBValue(red, RED_SHIFT);
108 rgbValue |= Color.getRGBValue(green, GREEN_SHIFT);
109 rgbValue |= Color.getRGBValue(blue, BLUE_SHIFT);
110 return rgbValue;
78 } 111 }
79 112
80 /** 113 /**
81 * Returns packed RGB components from given grayscale value. 114 * Returns packed RGB components from given grayscale value.
82 * 115 *
83 * @param gray a float between 0.0 and 1.0 116 * @param gray a float between 0.0 and 1.0
84 * @return 32-bits RGB color 117 * @return 32-bits RGB color
85 * @see #getGray 118 * @see #getGray
86 */ 119 */
87 public static int getRGB(float gray) { 120 public static int getRGB(float gray) {
88 // TODO getRGB 121 return Color.getRGB(gray, gray, gray);
89 return 0;
90 } 122 }
91 123
92 /** 124 /**
@@ -98,8 +130,16 @@ public final class Color {
98 * @see #getGray 130 * @see #getGray
99 */ 131 */
100 public static float[][] toGray(int[][] image) { 132 public static float[][] toGray(int[][] image) {
101 // TODO toGray 133 int width = image[0].length;
102 return null; 134 int height = image.length;
135
136 float[][] floatImage = new float[height][width];
137
138 for (int row = 0; row < height; ++row)
139 for (int col = 0; col < width; ++col)
140 floatImage[row][col] = Color.getGray(image[row][col]);
141
142 return floatImage;
103 } 143 }
104 144
105 /** 145 /**
@@ -111,8 +151,16 @@ public final class Color {
111 * @see #getRGB(float) 151 * @see #getRGB(float)
112 */ 152 */
113 public static int[][] toRGB(float[][] gray) { 153 public static int[][] toRGB(float[][] gray) {
114 // TODO toRGB 154 int width = gray[0].length;
115 return null; 155 int height = gray.length;
156
157 int[][] rgbImage = new int[height][width];
158
159 for (int row = 0; row < height; ++row)
160 for (int col = 0; col < width; ++col)
161 rgbImage[row][col] = Color.getRGB(gray[row][col]);
162
163 return rgbImage;
116 } 164 }
117 165
118} 166}