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1
22
23 package org.meshcms.core;
24
25 import java.awt.*;
26 import java.awt.image.*;
27 import java.io.*;
28 import org.meshcms.util.*;
29
30 public abstract class AbstractThumbnail {
31
34 public static final Color DEFAULT_BORDER_COLOR = new Color(216, 206, 203);
35
36
39 public abstract String  getSuggestedFileName();
40
41
48 protected abstract boolean createThumbnail(File imageFile, File thumbnailFile);
49
50
53 public Path checkAndCreate(WebSite webSite, Path imagePath,
54 String thumbnailFileName) {
55 Path thumbnailPath = webSite.getGeneratedFilesPath().add(imagePath);
56 thumbnailPath = thumbnailPath.add(getClass().getName(), thumbnailFileName);
57 File imageFile = webSite.getFile(imagePath);
58
59 if (!imageFile.exists() || imageFile.isDirectory()) {
60 return null;
61 }
62
63 File thumbnailFile = webSite.getFile(thumbnailPath);
64
65 if (!thumbnailFile.exists() ||
66 thumbnailFile.lastModified() < imageFile.lastModified()) {
67 thumbnailFile.getParentFile().mkdirs();
68
69 if (!createThumbnail(imageFile, thumbnailFile)) {
70 return null;
71 }
72 }
73
74 return thumbnailPath;
75 }
76
77 public static void drawResizedImage(Graphics g, BufferedImage image, int x, int y,
78 int width, int height, boolean highQuality) {
79 if (highQuality) {
80 BufferedImage resized = resize(image, width, height);
81 g.drawImage(resized, x, y, null);
82 resized.flush();
83 } else {
84 g.drawImage(image, x, y, width, height, null);
85 }
86 }
87
88
92 public static BufferedImage resize(BufferedImage in, int width, int height) {
93 checkImageSize(width, height);
94 int imageWidth = in.getWidth();
95 int imageHeight = in.getHeight();
96
97 return (imageWidth * imageHeight) / (width * height) > 4 ?
98 averageResize(in, width, height) :
99 linearResize(in, width, height);
100 }
101
102
106 public static BufferedImage linearResize(BufferedImage in, int width, int height) {
107 checkImageSize(width, height);
108 int imageWidth = in.getWidth();
109 int imageHeight = in.getHeight();
110 int[] pixels = in.getRGB(0, 0, imageWidth, imageHeight, null, 0, imageWidth);
111 int[] outPixels = new int[width * height];
112 int a, r, g, b;
113 int ox, x0, x1, oy, y0, y1;
114 int d = width * height;
115 int p11, p10, p01, p00;
116 int idx;
117
118 for (int py = 0; py < height; py++) {
119 for (int px = 0; px < width; px++) {
120 idx = py * width + px;
121 ox = px * imageWidth;
122 x0 = ox % width;
123 x1 = width - x0;
124 ox /= width;
125 oy = py * imageHeight;
126 y0 = oy % height;
127 y1 = height - y0;
128 oy /= height;
129
130 if (ox >= imageWidth - 1 || oy >= imageHeight - 1) {
131 outPixels[idx] = pixels[oy * imageWidth + ox];
132 } else {
133 p11 = pixels[(oy + 1) * imageWidth + (ox + 1)];
134 p10 = pixels[oy * imageWidth + (ox + 1)];
135 p01 = pixels[(oy + 1) * imageWidth + ox];
136 p00 = pixels[oy * imageWidth + ox];
137
138 a = ((x0 * y0 * ((p11 >> 24) & 0xFF) +
139 x0 * y1 * ((p10 >> 24) & 0xFF) +
140 x1 * y0 * ((p01 >> 24) & 0xFF) +
141 x1 * y1 * ((p00 >> 24) & 0xFF)) / d);
142
143 r = ((x0 * y0 * ((p11 >> 16) & 0xFF) +
144 x0 * y1 * ((p10 >> 16) & 0xFF) +
145 x1 * y0 * ((p01 >> 16) & 0xFF) +
146 x1 * y1 * ((p00 >> 16) & 0xFF)) / d);
147
148 g = ((x0 * y0 * ((p11 >> 8) & 0xFF) +
149 x0 * y1 * ((p10 >> 8) & 0xFF) +
150 x1 * y0 * ((p01 >> 8) & 0xFF) +
151 x1 * y1 * ((p00 >> 8) & 0xFF)) / d);
152
153 b = ((x0 * y0 * (p11 & 0xFF) +
154 x0 * y1 * (p10 & 0xFF) +
155 x1 * y0 * (p01 & 0xFF) +
156 x1 * y1 * (p00 & 0xFF)) / d);
157
158 outPixels[idx] = (a << 24) | (r << 16) | (g << 8) | b;
159 }
160 }
161 }
162
163 BufferedImage out = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
164 out.setRGB(0, 0, width, height, outPixels, 0, width);
165 return out;
166 }
167
168
172 public static BufferedImage averageResize(BufferedImage in, int width, int height) {
173 checkImageSize(width, height);
174 int imageWidth = in.getWidth();
175 int imageHeight = in.getHeight();
176 int[] pixels = in.getRGB(0, 0, imageWidth, imageHeight, null, 0, imageWidth);
177 int[] outPixels = new int[width * height];
178 int nw = Math.max(imageWidth / width + 1, 2);
179 int nh = Math.max(imageHeight / height + 1, 2);
180 int idx, i2, j2, argb, cnt;
181 int[] v = new int[3];
182 float kw = (float) imageWidth / (float) width;
183 float kh = (float) imageHeight / (float) height;
184 float nw2 = nw / 2.0F;
185 float nh2 = nh / 2.0F;
186
187 for (int i = 0; i < height; i++) {
188 for (int j = 0; j < width; j++) {
189 v[0] = v[1] = v[2] = cnt = 0;
190
191 i2 = (int) ((i + 0.5F) * kh - nh2);
192 j2 = (int) ((j + 0.5F) * kw - nw2);
193
194 for (int k = 0; k < nh; k++) {
195 for (int l = 0; l < nw; l++) {
196 idx = (j2 + l) + (i2 + k) * imageWidth;
197
198 if (idx > -1 && idx < pixels.length) {
199 argb = pixels[idx];
200 v[0] += (argb >> 16) & 0xFF;
201 v[1] += (argb >> 8) & 0xFF;
202 v[2] += argb & 0xFF;
203 cnt++;
204 }
205 }
206 }
207
208 outPixels[j + i * width] = 0xFF000000 | ((v[0] / cnt) << 16) |
209 ((v[1] / cnt) << 8) | (v[2] / cnt);
210 }
211 }
212
213 BufferedImage out = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
214 out.setRGB(0, 0, width, height, outPixels, 0, width);
215 return out;
216 }
217
218 private static void checkImageSize(int width, int height) {
219 if (width < 1) {
220 throw new IllegalArgumentException ("Invalid width: " + width + " pixels");
221 }
222
223 if (height < 1) {
224 throw new IllegalArgumentException ("Invalid height: " + height + " pixels");
225 }
226 }
227 }
228 |
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