1 /*
2 * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
3 * Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
4 *
5 * SPDX-License-Identifier: SGI-B-2.0
6 */
7
8 #include "packrender.h"
9
10 static const GLubyte MsbToLsbTable[256] = {
11 0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
12 0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
13 0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
14 0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
15 0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
16 0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
17 0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
18 0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
19 0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
20 0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
21 0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
22 0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
23 0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
24 0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
25 0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
26 0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
27 0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
28 0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
29 0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
30 0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
31 0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
32 0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
33 0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
34 0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
35 0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
36 0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
37 0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
38 0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
39 0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
40 0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
41 0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
42 0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff,
43 };
44
45 static const GLubyte LowBitsMask[9] = {
46 0x00, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f, 0xff,
47 };
48
49 static const GLubyte HighBitsMask[9] = {
50 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff,
51 };
52
53
54 /*
55 ** Copy bitmap data from clients packed memory applying unpacking modes as the
56 ** data is transferred into the destImage buffer. Return in modes the
57 ** set of pixel modes that are to be done by the server.
58 */
59 static void
FillBitmap(struct glx_context * gc,GLint width,GLint height,GLenum format,const GLvoid * userdata,GLubyte * destImage)60 FillBitmap(struct glx_context * gc, GLint width, GLint height,
61 GLenum format, const GLvoid * userdata, GLubyte * destImage)
62 {
63 const __GLXattribute *state = gc->client_state_private;
64 GLint rowLength = state->storeUnpack.rowLength;
65 GLint alignment = state->storeUnpack.alignment;
66 GLint skipPixels = state->storeUnpack.skipPixels;
67 GLint skipRows = state->storeUnpack.skipRows;
68 GLint lsbFirst = state->storeUnpack.lsbFirst;
69 GLint elementsLeft, bitOffset, currentByte, nextByte, highBitMask;
70 GLint lowBitMask, i;
71 GLint components, groupsPerRow, rowSize, padding, elementsPerRow;
72 const GLubyte *start, *iter;
73
74 if (rowLength > 0) {
75 groupsPerRow = rowLength;
76 }
77 else {
78 groupsPerRow = width;
79 }
80 components = __glElementsPerGroup(format, GL_BITMAP);
81 rowSize = (groupsPerRow * components + 7) >> 3;
82 padding = (rowSize % alignment);
83 if (padding) {
84 rowSize += alignment - padding;
85 }
86 start = ((const GLubyte *) userdata) + skipRows * rowSize +
87 ((skipPixels * components) >> 3);
88 bitOffset = (skipPixels * components) & 7;
89 highBitMask = LowBitsMask[8 - bitOffset];
90 lowBitMask = HighBitsMask[bitOffset];
91 elementsPerRow = width * components;
92 for (i = 0; i < height; i++) {
93 elementsLeft = elementsPerRow;
94 iter = start;
95 while (elementsLeft) {
96 /* First retrieve low bits from current byte */
97 if (lsbFirst) {
98 currentByte = MsbToLsbTable[iter[0]];
99 }
100 else {
101 currentByte = iter[0];
102 }
103 if (bitOffset) {
104 /* Need to read next byte to finish current byte */
105 if (elementsLeft > (8 - bitOffset)) {
106 if (lsbFirst) {
107 nextByte = MsbToLsbTable[iter[1]];
108 }
109 else {
110 nextByte = iter[1];
111 }
112 currentByte =
113 ((currentByte & highBitMask) << bitOffset) |
114 ((nextByte & lowBitMask) >> (8 - bitOffset));
115 }
116 else {
117 currentByte = ((currentByte & highBitMask) << bitOffset);
118 }
119 }
120 if (elementsLeft >= 8) {
121 *destImage = currentByte;
122 elementsLeft -= 8;
123 }
124 else {
125 *destImage = currentByte & HighBitsMask[elementsLeft];
126 elementsLeft = 0;
127 }
128 destImage++;
129 iter++;
130 }
131 start += rowSize;
132 }
133 }
134
135 /*
136 ** Extract array from user's data applying all pixel store modes.
137 ** The internal packed array format used has LSB_FIRST = FALSE and
138 ** ALIGNMENT = 1.
139 */
140 void
__glFillImage(struct glx_context * gc,GLint dim,GLint width,GLint height,GLint depth,GLenum format,GLenum type,const GLvoid * userdata,GLubyte * newimage,GLubyte * modes)141 __glFillImage(struct glx_context * gc, GLint dim, GLint width, GLint height,
142 GLint depth, GLenum format, GLenum type,
143 const GLvoid * userdata, GLubyte * newimage, GLubyte * modes)
144 {
145 const __GLXattribute *state = gc->client_state_private;
146 GLint rowLength = state->storeUnpack.rowLength;
147 GLint imageHeight = state->storeUnpack.imageHeight;
148 GLint alignment = state->storeUnpack.alignment;
149 GLint skipPixels = state->storeUnpack.skipPixels;
150 GLint skipRows = state->storeUnpack.skipRows;
151 GLint skipImages = state->storeUnpack.skipImages;
152 GLint swapBytes = state->storeUnpack.swapEndian;
153 GLint components, elementSize, rowSize, padding, groupsPerRow, groupSize;
154 GLint elementsPerRow, imageSize, rowsPerImage, h, i, j, k;
155 const GLubyte *start, *iter, *itera, *iterb, *iterc;
156 GLubyte *iter2;
157
158 if (type == GL_BITMAP) {
159 FillBitmap(gc, width, height, format, userdata, newimage);
160 }
161 else {
162 components = __glElementsPerGroup(format, type);
163 if (rowLength > 0) {
164 groupsPerRow = rowLength;
165 }
166 else {
167 groupsPerRow = width;
168 }
169 if (imageHeight > 0) {
170 rowsPerImage = imageHeight;
171 }
172 else {
173 rowsPerImage = height;
174 }
175
176 elementSize = __glBytesPerElement(type);
177 groupSize = elementSize * components;
178 if (elementSize == 1)
179 swapBytes = 0;
180
181 rowSize = groupsPerRow * groupSize;
182 padding = (rowSize % alignment);
183 if (padding) {
184 rowSize += alignment - padding;
185 }
186 imageSize = rowSize * rowsPerImage;
187 start = ((const GLubyte *) userdata) + skipImages * imageSize +
188 skipRows * rowSize + skipPixels * groupSize;
189 iter2 = newimage;
190 elementsPerRow = width * components;
191
192 if (swapBytes) {
193 itera = start;
194 for (h = 0; h < depth; h++) {
195 iterb = itera;
196 for (i = 0; i < height; i++) {
197 iterc = iterb;
198 for (j = 0; j < elementsPerRow; j++) {
199 for (k = 1; k <= elementSize; k++) {
200 iter2[k - 1] = iterc[elementSize - k];
201 }
202 iter2 += elementSize;
203 iterc += elementSize;
204 }
205 iterb += rowSize;
206 }
207 itera += imageSize;
208 }
209 }
210 else {
211 itera = start;
212 for (h = 0; h < depth; h++) {
213 if (rowSize == elementsPerRow * elementSize) {
214 /* Ha! This is mondo easy! */
215 __GLX_MEM_COPY(iter2, itera,
216 elementsPerRow * elementSize * height);
217 iter2 += elementsPerRow * elementSize * height;
218 }
219 else {
220 iter = itera;
221 for (i = 0; i < height; i++) {
222 __GLX_MEM_COPY(iter2, iter, elementsPerRow * elementSize);
223 iter2 += elementsPerRow * elementSize;
224 iter += rowSize;
225 }
226 }
227 itera += imageSize;
228 }
229 }
230 }
231
232 /* Setup store modes that describe what we just did */
233 if (modes) {
234 if (dim < 3) {
235 (void) memcpy(modes, __glXDefaultPixelStore + 4, 20);
236 }
237 else {
238 (void) memcpy(modes, __glXDefaultPixelStore + 0, 36);
239 }
240 }
241 }
242
243 /*
244 ** Empty a bitmap in LSB_FIRST=GL_FALSE and ALIGNMENT=4 format packing it
245 ** into the clients memory using the pixel store PACK modes.
246 */
247 static void
EmptyBitmap(struct glx_context * gc,GLint width,GLint height,GLenum format,const GLubyte * sourceImage,GLvoid * userdata)248 EmptyBitmap(struct glx_context * gc, GLint width, GLint height,
249 GLenum format, const GLubyte * sourceImage, GLvoid * userdata)
250 {
251 const __GLXattribute *state = gc->client_state_private;
252 GLint rowLength = state->storePack.rowLength;
253 GLint alignment = state->storePack.alignment;
254 GLint skipPixels = state->storePack.skipPixels;
255 GLint skipRows = state->storePack.skipRows;
256 GLint lsbFirst = state->storePack.lsbFirst;
257 GLint components, groupsPerRow, rowSize, padding, elementsPerRow;
258 GLint sourceRowSize, sourcePadding, sourceSkip;
259 GLubyte *start, *iter;
260 GLint elementsLeft, bitOffset, currentByte, highBitMask, lowBitMask;
261 GLint writeMask, i;
262 GLubyte writeByte;
263
264 components = __glElementsPerGroup(format, GL_BITMAP);
265 if (rowLength > 0) {
266 groupsPerRow = rowLength;
267 }
268 else {
269 groupsPerRow = width;
270 }
271
272 rowSize = (groupsPerRow * components + 7) >> 3;
273 padding = (rowSize % alignment);
274 if (padding) {
275 rowSize += alignment - padding;
276 }
277 sourceRowSize = (width * components + 7) >> 3;
278 sourcePadding = (sourceRowSize % 4);
279 if (sourcePadding) {
280 sourceSkip = 4 - sourcePadding;
281 }
282 else {
283 sourceSkip = 0;
284 }
285 start = ((GLubyte *) userdata) + skipRows * rowSize +
286 ((skipPixels * components) >> 3);
287 bitOffset = (skipPixels * components) & 7;
288 highBitMask = LowBitsMask[8 - bitOffset];
289 lowBitMask = HighBitsMask[bitOffset];
290 elementsPerRow = width * components;
291 for (i = 0; i < height; i++) {
292 elementsLeft = elementsPerRow;
293 iter = start;
294 writeMask = highBitMask;
295 writeByte = 0;
296 while (elementsLeft) {
297 /* Set up writeMask (to write to current byte) */
298 if (elementsLeft + bitOffset < 8) {
299 /* Need to trim writeMask */
300 writeMask &= HighBitsMask[bitOffset + elementsLeft];
301 }
302
303 if (lsbFirst) {
304 currentByte = MsbToLsbTable[iter[0]];
305 }
306 else {
307 currentByte = iter[0];
308 }
309
310 if (bitOffset) {
311 writeByte |= (sourceImage[0] >> bitOffset);
312 currentByte = (currentByte & ~writeMask) |
313 (writeByte & writeMask);
314 writeByte = (sourceImage[0] << (8 - bitOffset));
315 }
316 else {
317 currentByte = (currentByte & ~writeMask) |
318 (sourceImage[0] & writeMask);
319 }
320
321 if (lsbFirst) {
322 iter[0] = MsbToLsbTable[currentByte];
323 }
324 else {
325 iter[0] = currentByte;
326 }
327
328 if (elementsLeft >= 8) {
329 elementsLeft -= 8;
330 }
331 else {
332 elementsLeft = 0;
333 }
334 sourceImage++;
335 iter++;
336 writeMask = 0xff;
337 }
338 if (writeByte) {
339 /* Some data left over that still needs writing */
340 writeMask &= lowBitMask;
341 if (lsbFirst) {
342 currentByte = MsbToLsbTable[iter[0]];
343 }
344 else {
345 currentByte = iter[0];
346 }
347 currentByte = (currentByte & ~writeMask) | (writeByte & writeMask);
348 if (lsbFirst) {
349 iter[0] = MsbToLsbTable[currentByte];
350 }
351 else {
352 iter[0] = currentByte;
353 }
354 }
355 start += rowSize;
356 sourceImage += sourceSkip;
357 }
358 }
359
360 /*
361 ** Insert array into user's data applying all pixel store modes.
362 ** The packed array format from the server is LSB_FIRST = FALSE,
363 ** SWAP_BYTES = the current pixel storage pack mode, and ALIGNMENT = 4.
364 ** Named __glEmptyImage() because it is the opposite of __glFillImage().
365 */
366 /* ARGSUSED */
367 void
__glEmptyImage(struct glx_context * gc,GLint dim,GLint width,GLint height,GLint depth,GLenum format,GLenum type,const GLubyte * sourceImage,GLvoid * userdata)368 __glEmptyImage(struct glx_context * gc, GLint dim, GLint width, GLint height,
369 GLint depth, GLenum format, GLenum type,
370 const GLubyte * sourceImage, GLvoid * userdata)
371 {
372 const __GLXattribute *state = gc->client_state_private;
373 GLint rowLength = state->storePack.rowLength;
374 GLint imageHeight = state->storePack.imageHeight;
375 GLint alignment = state->storePack.alignment;
376 GLint skipPixels = state->storePack.skipPixels;
377 GLint skipRows = state->storePack.skipRows;
378 GLint skipImages = state->storePack.skipImages;
379 GLint components, elementSize, rowSize, padding, groupsPerRow, groupSize;
380 GLint elementsPerRow, sourceRowSize, sourcePadding, h, i;
381 GLint imageSize, rowsPerImage;
382 GLubyte *start, *iter, *itera;
383
384 if (type == GL_BITMAP) {
385 EmptyBitmap(gc, width, height, format, sourceImage, userdata);
386 }
387 else {
388 components = __glElementsPerGroup(format, type);
389 if (rowLength > 0) {
390 groupsPerRow = rowLength;
391 }
392 else {
393 groupsPerRow = width;
394 }
395 if (imageHeight > 0) {
396 rowsPerImage = imageHeight;
397 }
398 else {
399 rowsPerImage = height;
400 }
401 elementSize = __glBytesPerElement(type);
402 groupSize = elementSize * components;
403 rowSize = groupsPerRow * groupSize;
404 padding = (rowSize % alignment);
405 if (padding) {
406 rowSize += alignment - padding;
407 }
408 sourceRowSize = width * groupSize;
409 sourcePadding = (sourceRowSize % 4);
410 if (sourcePadding) {
411 sourceRowSize += 4 - sourcePadding;
412 }
413 imageSize = sourceRowSize * rowsPerImage;
414 start = ((GLubyte *) userdata) + skipImages * imageSize +
415 skipRows * rowSize + skipPixels * groupSize;
416 elementsPerRow = width * components;
417
418 itera = start;
419 for (h = 0; h < depth; h++) {
420 if ((rowSize == sourceRowSize) && (sourcePadding == 0)) {
421 /* Ha! This is mondo easy! */
422 __GLX_MEM_COPY(itera, sourceImage,
423 elementsPerRow * elementSize * height);
424 sourceImage += elementsPerRow * elementSize * height;
425 }
426 else {
427 iter = itera;
428 for (i = 0; i < height; i++) {
429 __GLX_MEM_COPY(iter, sourceImage,
430 elementsPerRow * elementSize);
431 sourceImage += sourceRowSize;
432 iter += rowSize;
433 }
434 }
435 itera += imageSize;
436 }
437 }
438 }
439