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comparison dwt/internal/image/OS2BMPFileFormat.d @ 0:380af2bdd8e5
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author | Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com> |
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date | Sat, 09 Aug 2008 17:00:02 +0200 |
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children | e831403a80a9 |
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1 /******************************************************************************* | |
2 * Copyright (c) 2000, 2005 IBM Corporation and others. | |
3 * All rights reserved. This program and the accompanying materials | |
4 * are made available under the terms of the Eclipse Public License v1.0 | |
5 * which accompanies this distribution, and is available at | |
6 * http://www.eclipse.org/legal/epl-v10.html | |
7 * | |
8 * Contributors: | |
9 * IBM Corporation - initial API and implementation | |
10 *******************************************************************************/ | |
11 module dwt.internal.image; | |
12 | |
13 | |
14 import java.io.ByteArrayOutputStream; | |
15 import java.io.IOException; | |
16 import java.io.OutputStream; | |
17 | |
18 import dwt.DWT; | |
19 import dwt.graphics.ImageData; | |
20 import dwt.graphics.ImageLoader; | |
21 import dwt.graphics.PaletteData; | |
22 import dwt.graphics.RGB; | |
23 | |
24 public final class OS2BMPFileFormat : FileFormat { | |
25 static final int BMPFileHeaderSize = 14; | |
26 static final int BMPHeaderFixedSize = 12; | |
27 int width, height, bitCount; | |
28 | |
29 bool isFileFormat(LEDataInputStream stream) { | |
30 try { | |
31 byte[] header = new byte[18]; | |
32 stream.read(header); | |
33 stream.unread(header); | |
34 int infoHeaderSize = (header[14] & 0xFF) | ((header[15] & 0xFF) << 8) | ((header[16] & 0xFF) << 16) | ((header[17] & 0xFF) << 24); | |
35 return header[0] is 0x42 && header[1] is 0x4D && infoHeaderSize is BMPHeaderFixedSize; | |
36 } catch (Exception e) { | |
37 return false; | |
38 } | |
39 } | |
40 byte[] loadData(byte[] infoHeader) { | |
41 int stride = (width * bitCount + 7) / 8; | |
42 stride = (stride + 3) / 4 * 4; // Round up to 4 byte multiple | |
43 byte[] data = loadData(infoHeader, stride); | |
44 flipScanLines(data, stride, height); | |
45 return data; | |
46 } | |
47 byte[] loadData(byte[] infoHeader, int stride) { | |
48 int dataSize = height * stride; | |
49 byte[] data = new byte[dataSize]; | |
50 try { | |
51 if (inputStream.read(data) !is dataSize) | |
52 DWT.error(DWT.ERROR_INVALID_IMAGE); | |
53 } catch (IOException e) { | |
54 DWT.error(DWT.ERROR_IO, e); | |
55 } | |
56 return data; | |
57 } | |
58 int[] loadFileHeader() { | |
59 int[] header = new int[5]; | |
60 try { | |
61 header[0] = inputStream.readShort(); | |
62 header[1] = inputStream.readInt(); | |
63 header[2] = inputStream.readShort(); | |
64 header[3] = inputStream.readShort(); | |
65 header[4] = inputStream.readInt(); | |
66 } catch (IOException e) { | |
67 DWT.error(DWT.ERROR_IO, e); | |
68 } | |
69 if (header[0] !is 0x4D42) | |
70 DWT.error(DWT.ERROR_INVALID_IMAGE); | |
71 return header; | |
72 } | |
73 ImageData[] loadFromByteStream() { | |
74 int[] fileHeader = loadFileHeader(); | |
75 byte[] infoHeader = new byte[BMPHeaderFixedSize]; | |
76 try { | |
77 inputStream.read(infoHeader); | |
78 } catch (Exception e) { | |
79 DWT.error(DWT.ERROR_IO, e); | |
80 } | |
81 width = (infoHeader[4] & 0xFF) | ((infoHeader[5] & 0xFF) << 8); | |
82 height = (infoHeader[6] & 0xFF) | ((infoHeader[7] & 0xFF) << 8); | |
83 bitCount = (infoHeader[10] & 0xFF) | ((infoHeader[11] & 0xFF) << 8); | |
84 PaletteData palette = loadPalette(infoHeader); | |
85 if (inputStream.getPosition() < fileHeader[4]) { | |
86 // Seek to the specified offset | |
87 try { | |
88 inputStream.skip(fileHeader[4] - inputStream.getPosition()); | |
89 } catch (IOException e) { | |
90 DWT.error(DWT.ERROR_IO, e); | |
91 } | |
92 } | |
93 byte[] data = loadData(infoHeader); | |
94 int type = DWT.IMAGE_OS2_BMP; | |
95 return new ImageData[] { | |
96 ImageData.internal_new( | |
97 width, | |
98 height, | |
99 bitCount, | |
100 palette, | |
101 4, | |
102 data, | |
103 0, | |
104 null, | |
105 null, | |
106 -1, | |
107 -1, | |
108 type, | |
109 0, | |
110 0, | |
111 0, | |
112 0) | |
113 }; | |
114 } | |
115 PaletteData loadPalette(byte[] infoHeader) { | |
116 if (bitCount <= 8) { | |
117 int numColors = 1 << bitCount; | |
118 byte[] buf = new byte[numColors * 3]; | |
119 try { | |
120 if (inputStream.read(buf) !is buf.length) | |
121 DWT.error(DWT.ERROR_INVALID_IMAGE); | |
122 } catch (IOException e) { | |
123 DWT.error(DWT.ERROR_IO, e); | |
124 } | |
125 return paletteFromBytes(buf, numColors); | |
126 } | |
127 if (bitCount is 16) return new PaletteData(0x7C00, 0x3E0, 0x1F); | |
128 if (bitCount is 24) return new PaletteData(0xFF, 0xFF00, 0xFF0000); | |
129 return new PaletteData(0xFF00, 0xFF0000, 0xFF000000); | |
130 } | |
131 PaletteData paletteFromBytes(byte[] bytes, int numColors) { | |
132 int bytesOffset = 0; | |
133 RGB[] colors = new RGB[numColors]; | |
134 for (int i = 0; i < numColors; i++) { | |
135 colors[i] = new RGB(bytes[bytesOffset + 2] & 0xFF, | |
136 bytes[bytesOffset + 1] & 0xFF, | |
137 bytes[bytesOffset] & 0xFF); | |
138 bytesOffset += 3; | |
139 } | |
140 return new PaletteData(colors); | |
141 } | |
142 /** | |
143 * Answer a byte array containing the BMP representation of | |
144 * the given device independent palette. | |
145 */ | |
146 static byte[] paletteToBytes(PaletteData pal) { | |
147 int n = pal.colors is null ? 0 : (pal.colors.length < 256 ? pal.colors.length : 256); | |
148 byte[] bytes = new byte[n * 3]; | |
149 int offset = 0; | |
150 for (int i = 0; i < n; i++) { | |
151 RGB col = pal.colors[i]; | |
152 bytes[offset] = (byte)col.blue; | |
153 bytes[offset + 1] = (byte)col.green; | |
154 bytes[offset + 2] = (byte)col.red; | |
155 offset += 3; | |
156 } | |
157 return bytes; | |
158 } | |
159 /** | |
160 * Unload the given image's data into the given byte stream. | |
161 * Answer the number of bytes written. | |
162 */ | |
163 int unloadData(ImageData image, OutputStream out) { | |
164 int bmpBpl = 0; | |
165 try { | |
166 int bpl = (image.width * image.depth + 7) / 8; | |
167 bmpBpl = (bpl + 3) / 4 * 4; // BMP pads scanlines to multiples of 4 bytes | |
168 int linesPerBuf = 32678 / bmpBpl; | |
169 byte[] buf = new byte[linesPerBuf * bmpBpl]; | |
170 byte[] data = image.data; | |
171 int imageBpl = image.bytesPerLine; | |
172 int dataIndex = imageBpl * (image.height - 1); // Start at last line | |
173 if (image.depth is 16) { | |
174 for (int y = 0; y < image.height; y += linesPerBuf) { | |
175 int count = image.height - y; | |
176 if (linesPerBuf < count) count = linesPerBuf; | |
177 int bufOffset = 0; | |
178 for (int i = 0; i < count; i++) { | |
179 for (int wIndex = 0; wIndex < bpl; wIndex += 2) { | |
180 buf[bufOffset + wIndex + 1] = data[dataIndex + wIndex + 1]; | |
181 buf[bufOffset + wIndex] = data[dataIndex + wIndex]; | |
182 } | |
183 bufOffset += bmpBpl; | |
184 dataIndex -= imageBpl; | |
185 } | |
186 out.write(buf, 0, bufOffset); | |
187 } | |
188 } else { | |
189 for (int y = 0; y < image.height; y += linesPerBuf) { | |
190 int tmp = image.height - y; | |
191 int count = tmp < linesPerBuf ? tmp : linesPerBuf; | |
192 int bufOffset = 0; | |
193 for (int i = 0; i < count; i++) { | |
194 System.arraycopy(data, dataIndex, buf, bufOffset, bpl); | |
195 bufOffset += bmpBpl; | |
196 dataIndex -= imageBpl; | |
197 } | |
198 out.write(buf, 0, bufOffset); | |
199 } | |
200 } | |
201 } catch (IOException e) { | |
202 DWT.error(DWT.ERROR_IO, e); | |
203 } | |
204 return bmpBpl * image.height; | |
205 } | |
206 /** | |
207 * Unload a DeviceIndependentImage using Windows .BMP format into the given | |
208 * byte stream. | |
209 */ | |
210 void unloadIntoByteStream(ImageLoader loader) { | |
211 ImageData image = loader.data[0]; | |
212 byte[] rgbs; | |
213 int numCols; | |
214 if (!((image.depth is 1) || (image.depth is 4) || (image.depth is 8) || | |
215 (image.depth is 16) || (image.depth is 24) || (image.depth is 32))) | |
216 DWT.error(DWT.ERROR_UNSUPPORTED_DEPTH); | |
217 PaletteData pal = image.palette; | |
218 if ((image.depth is 16) || (image.depth is 24) || (image.depth is 32)) { | |
219 if (!pal.isDirect) | |
220 DWT.error(DWT.ERROR_INVALID_IMAGE); | |
221 numCols = 0; | |
222 rgbs = null; | |
223 } else { | |
224 if (pal.isDirect) | |
225 DWT.error(DWT.ERROR_INVALID_IMAGE); | |
226 numCols = pal.colors.length; | |
227 rgbs = paletteToBytes(pal); | |
228 } | |
229 // Fill in file header, except for bfsize, which is done later. | |
230 int headersSize = BMPFileHeaderSize + BMPHeaderFixedSize; | |
231 int[] fileHeader = new int[5]; | |
232 fileHeader[0] = 0x4D42; // Signature | |
233 fileHeader[1] = 0; // File size - filled in later | |
234 fileHeader[2] = 0; // Reserved 1 | |
235 fileHeader[3] = 0; // Reserved 2 | |
236 fileHeader[4] = headersSize; // Offset to data | |
237 if (rgbs !is null) { | |
238 fileHeader[4] += rgbs.length; | |
239 } | |
240 | |
241 // Prepare data. This is done first so we don't have to try to rewind | |
242 // the stream and fill in the details later. | |
243 ByteArrayOutputStream out = new ByteArrayOutputStream(); | |
244 unloadData(image, out); | |
245 byte[] data = out.toByteArray(); | |
246 | |
247 // Calculate file size | |
248 fileHeader[1] = fileHeader[4] + data.length; | |
249 | |
250 // Write the headers | |
251 try { | |
252 outputStream.writeShort(fileHeader[0]); | |
253 outputStream.writeInt(fileHeader[1]); | |
254 outputStream.writeShort(fileHeader[2]); | |
255 outputStream.writeShort(fileHeader[3]); | |
256 outputStream.writeInt(fileHeader[4]); | |
257 } catch (IOException e) { | |
258 DWT.error(DWT.ERROR_IO, e); | |
259 } | |
260 try { | |
261 outputStream.writeInt(BMPHeaderFixedSize); | |
262 outputStream.writeShort(image.width); | |
263 outputStream.writeShort(image.height); | |
264 outputStream.writeShort(1); | |
265 outputStream.writeShort((short)image.depth); | |
266 } catch (IOException e) { | |
267 DWT.error(DWT.ERROR_IO, e); | |
268 } | |
269 | |
270 // Unload palette | |
271 if (numCols > 0) { | |
272 try { | |
273 outputStream.write(rgbs); | |
274 } catch (IOException e) { | |
275 DWT.error(DWT.ERROR_IO, e); | |
276 } | |
277 } | |
278 | |
279 // Unload the data | |
280 try { | |
281 outputStream.write(data); | |
282 } catch (IOException e) { | |
283 DWT.error(DWT.ERROR_IO, e); | |
284 } | |
285 } | |
286 void flipScanLines(byte[] data, int stride, int height) { | |
287 int i1 = 0; | |
288 int i2 = (height - 1) * stride; | |
289 for (int i = 0; i < height / 2; i++) { | |
290 for (int index = 0; index < stride; index++) { | |
291 byte b = data[index + i1]; | |
292 data[index + i1] = data[index + i2]; | |
293 data[index + i2] = b; | |
294 } | |
295 i1 += stride; | |
296 i2 -= stride; | |
297 } | |
298 } | |
299 | |
300 } |