1 /* 2 * Copyright (C) 2013 The Android Open Source Project 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 package com.android.ide.eclipse.adt.internal.editors.draw9patch.graphics; 18 19 import org.eclipse.swt.graphics.ImageData; 20 21 /** 22 * The utility class for SWT Image and ImageData manipulation. 23 */ 24 public class GraphicsUtilities { 25 26 /** 27 * Convert normal image to 9-patched. 28 * @return Returns 9-patched ImageData object. If image is null, returns null. 29 */ 30 public static ImageData convertToNinePatch(ImageData image) { 31 if (image == null) { 32 return null; 33 } 34 ImageData result = new ImageData(image.width + 2, image.height + 2, image.depth, 35 image.palette); 36 37 final int[] colors = new int[image.width]; 38 final byte[] alpha = new byte[image.width]; 39 40 for (int y = 0; y < image.height; y++) { 41 42 // Copy pixels 43 image.getPixels(0, y, image.width, colors, 0); 44 result.setPixels(1, y + 1, image.width, colors, 0); 45 46 // Copy alpha 47 image.getAlphas(0, y, image.width, alpha, 0); 48 result.setAlphas(1, y + 1, image.width, alpha, 0); 49 } 50 51 return result; 52 } 53 54 /** 55 * Wipe all color and alpha pixels. 56 */ 57 public static void clearImageData(ImageData imageData) { 58 if (imageData == null) { 59 throw new IllegalArgumentException("image data must not be null"); 60 } 61 int width = imageData.width; 62 int height = imageData.height; 63 for (int y = 0; y < height; y++) { 64 for (int x = 0; x < width; x++) { 65 imageData.setPixel(x, y, 0x00000000); 66 imageData.setAlpha(x, y, 0x00); 67 } 68 } 69 } 70 71 /** 72 * Duplicate the image data. 73 * @return If image is null, return null. 74 */ 75 public static ImageData copy(ImageData image) { 76 if (image == null) { 77 return null; 78 } 79 ImageData result = new ImageData(image.width, image.height, image.depth, 80 image.palette); 81 82 final int[] colors = new int[image.width]; 83 final byte[] alpha = new byte[image.width]; 84 85 for (int y = 0; y < image.height; y++) { 86 87 // Copy pixels 88 image.getPixels(0, y, image.width, colors, 0); 89 result.setPixels(0, y, image.width, colors, 0); 90 91 // Copy alpha 92 image.getAlphas(0, y, image.width, alpha, 0); 93 result.setAlphas(0, y, image.width, alpha, 0); 94 } 95 96 return result; 97 } 98 99 /** 100 * Get column pixels. 101 * @return length of obtained pixels. 102 */ 103 public static int getVerticalPixels(ImageData data, int x, int y, int height, int[] out) { 104 if (data == null) { 105 throw new IllegalArgumentException("data must not be null"); 106 } 107 if (out == null) { 108 throw new IllegalArgumentException("out array must not be null"); 109 } 110 if (height > out.length) { 111 throw new IllegalArgumentException("out array length must be > height"); 112 } 113 if (data.height < (y + height)) { 114 throw new IllegalArgumentException("image height must be > (y + height)"); 115 } 116 if (x < 0 || y < 0) { 117 throw new IllegalArgumentException("argument x, y must be >= 0"); 118 } 119 if (x >= data.width) { 120 throw new IllegalArgumentException("argument x must be < data.width"); 121 } 122 if (y >= data.height) { 123 throw new IllegalArgumentException("argument y must be < data.height"); 124 } 125 if (height <= 0) { 126 throw new IllegalArgumentException("argument height must be > 0"); 127 } 128 129 int idx = 0; 130 while (idx < height) { 131 data.getPixels(x, (y + idx), 1, out, idx); 132 idx++; 133 } 134 return idx; 135 } 136 137 /** 138 * Get row pixels. 139 */ 140 public static void getHorizontalPixels(ImageData data, int x, int y, int width, int[] out) { 141 if (data == null) { 142 throw new IllegalArgumentException("data must not be null"); 143 } 144 if (out == null) { 145 throw new IllegalArgumentException("out array must not be null"); 146 } 147 if (width > out.length) { 148 throw new IllegalArgumentException("out array length must be > width"); 149 } 150 if (data.width < (x + width)) { 151 throw new IllegalArgumentException("image height must be > (x + width)"); 152 } 153 if (x < 0 || y < 0) { 154 throw new IllegalArgumentException("argument x, y must be >= 0"); 155 } 156 if (x >= data.width) { 157 throw new IllegalArgumentException("argument x must be < data.width"); 158 } 159 if (y >= data.height) { 160 throw new IllegalArgumentException("argument y must be < data.height"); 161 } 162 if (width <= 0) { 163 throw new IllegalArgumentException("argument width must be > 0"); 164 } 165 166 data.getPixels(x, y, width, out, 0); 167 } 168 169 } 170
