pixel.c revision 6e8897ff9f90601ebf6eed500ad942c11b54d1f7 
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 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice including the dates of first publication and
13 * either this permission notice or a reference to
14 * http://oss.sgi.com/projects/FreeB/
15 * shall be included in all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * SILICON GRAPHICS, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
21 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
22 * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23 * SOFTWARE.
24 *
25 * Except as contained in this notice, the name of Silicon Graphics, Inc.
26 * shall not be used in advertising or otherwise to promote the sale, use or
27 * other dealings in this Software without prior written authorization from
28 * Silicon Graphics, Inc.
29 */
30
31#include "packrender.h"
32
33static const GLubyte MsbToLsbTable[256] = {
34   0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
35   0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
36   0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
37   0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
38   0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
39   0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
40   0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
41   0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
42   0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
43   0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
44   0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
45   0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
46   0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
47   0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
48   0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
49   0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
50   0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
51   0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
52   0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
53   0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
54   0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
55   0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
56   0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
57   0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
58   0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
59   0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
60   0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
61   0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
62   0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
63   0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
64   0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
65   0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff,
66};
67
68static const GLubyte LowBitsMask[9] = {
69   0x00, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f, 0xff,
70};
71
72static const GLubyte HighBitsMask[9] = {
73   0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff,
74};
75
76
77/*
78** Copy bitmap data from clients packed memory applying unpacking modes as the
79** data is transfered into the destImage buffer.  Return in modes the
80** set of pixel modes that are to be done by the server.
81*/
82static void
83FillBitmap(__GLXcontext * gc, GLint width, GLint height,
84           GLenum format, const GLvoid * userdata, GLubyte * destImage)
85{
86   const __GLXattribute *state = gc->client_state_private;
87   GLint rowLength = state->storeUnpack.rowLength;
88   GLint alignment = state->storeUnpack.alignment;
89   GLint skipPixels = state->storeUnpack.skipPixels;
90   GLint skipRows = state->storeUnpack.skipRows;
91   GLint lsbFirst = state->storeUnpack.lsbFirst;
92   GLint elementsLeft, bitOffset, currentByte, nextByte, highBitMask;
93   GLint lowBitMask, i;
94   GLint components, groupsPerRow, rowSize, padding, elementsPerRow;
95   const GLubyte *start, *iter;
96
97   if (rowLength > 0) {
98      groupsPerRow = rowLength;
99   }
100   else {
101      groupsPerRow = width;
102   }
103   components = __glElementsPerGroup(format, GL_BITMAP);
104   rowSize = (groupsPerRow * components + 7) >> 3;
105   padding = (rowSize % alignment);
106   if (padding) {
107      rowSize += alignment - padding;
108   }
109   start = ((const GLubyte *) userdata) + skipRows * rowSize +
110      ((skipPixels * components) >> 3);
111   bitOffset = (skipPixels * components) & 7;
112   highBitMask = LowBitsMask[8 - bitOffset];
113   lowBitMask = HighBitsMask[bitOffset];
114   elementsPerRow = width * components;
115   for (i = 0; i < height; i++) {
116      elementsLeft = elementsPerRow;
117      iter = start;
118      while (elementsLeft) {
119         /* First retrieve low bits from current byte */
120         if (lsbFirst) {
121            currentByte = MsbToLsbTable[iter[0]];
122         }
123         else {
124            currentByte = iter[0];
125         }
126         if (bitOffset) {
127            /* Need to read next byte to finish current byte */
128            if (elementsLeft > (8 - bitOffset)) {
129               if (lsbFirst) {
130                  nextByte = MsbToLsbTable[iter[1]];
131               }
132               else {
133                  nextByte = iter[1];
134               }
135               currentByte =
136                  ((currentByte & highBitMask) << bitOffset) |
137                  ((nextByte & lowBitMask) >> (8 - bitOffset));
138            }
139            else {
140               currentByte = ((currentByte & highBitMask) << bitOffset);
141            }
142         }
143         if (elementsLeft >= 8) {
144            *destImage = currentByte;
145            elementsLeft -= 8;
146         }
147         else {
148            *destImage = currentByte & HighBitsMask[elementsLeft];
149            elementsLeft = 0;
150         }
151         destImage++;
152         iter++;
153      }
154      start += rowSize;
155   }
156}
157
158/*
159** Extract array from user's data applying all pixel store modes.
160** The internal packed array format used has LSB_FIRST = FALSE and
161** ALIGNMENT = 1.
162*/
163void
164__glFillImage(__GLXcontext * gc, GLint dim, GLint width, GLint height,
165              GLint depth, GLenum format, GLenum type,
166              const GLvoid * userdata, GLubyte * newimage, GLubyte * modes)
167{
168   const __GLXattribute *state = gc->client_state_private;
169   GLint rowLength = state->storeUnpack.rowLength;
170   GLint imageHeight = state->storeUnpack.imageHeight;
171   GLint alignment = state->storeUnpack.alignment;
172   GLint skipPixels = state->storeUnpack.skipPixels;
173   GLint skipRows = state->storeUnpack.skipRows;
174   GLint skipImages = state->storeUnpack.skipImages;
175   GLint swapBytes = state->storeUnpack.swapEndian;
176   GLint components, elementSize, rowSize, padding, groupsPerRow, groupSize;
177   GLint elementsPerRow, imageSize, rowsPerImage, h, i, j, k;
178   const GLubyte *start, *iter, *itera, *iterb, *iterc;
179   GLubyte *iter2;
180
181   if (type == GL_BITMAP) {
182      FillBitmap(gc, width, height, format, userdata, newimage);
183   }
184   else {
185      components = __glElementsPerGroup(format, type);
186      if (rowLength > 0) {
187         groupsPerRow = rowLength;
188      }
189      else {
190         groupsPerRow = width;
191      }
192      if (imageHeight > 0) {
193         rowsPerImage = imageHeight;
194      }
195      else {
196         rowsPerImage = height;
197      }
198
199      elementSize = __glBytesPerElement(type);
200      groupSize = elementSize * components;
201      if (elementSize == 1)
202         swapBytes = 0;
203
204      rowSize = groupsPerRow * groupSize;
205      padding = (rowSize % alignment);
206      if (padding) {
207         rowSize += alignment - padding;
208      }
209      imageSize = rowSize * rowsPerImage;
210      start = ((const GLubyte *) userdata) + skipImages * imageSize +
211         skipRows * rowSize + skipPixels * groupSize;
212      iter2 = newimage;
213      elementsPerRow = width * components;
214
215      if (swapBytes) {
216         itera = start;
217         for (h = 0; h < depth; h++) {
218            iterb = itera;
219            for (i = 0; i < height; i++) {
220               iterc = iterb;
221               for (j = 0; j < elementsPerRow; j++) {
222                  for (k = 1; k <= elementSize; k++) {
223                     iter2[k - 1] = iterc[elementSize - k];
224                  }
225                  iter2 += elementSize;
226                  iterc += elementSize;
227               }
228               iterb += rowSize;
229            }
230            itera += imageSize;
231         }
232      }
233      else {
234         itera = start;
235         for (h = 0; h < depth; h++) {
236            if (rowSize == elementsPerRow * elementSize) {
237               /* Ha!  This is mondo easy! */
238               __GLX_MEM_COPY(iter2, itera,
239                              elementsPerRow * elementSize * height);
240               iter2 += elementsPerRow * elementSize * height;
241            }
242            else {
243               iter = itera;
244               for (i = 0; i < height; i++) {
245                  __GLX_MEM_COPY(iter2, iter, elementsPerRow * elementSize);
246                  iter2 += elementsPerRow * elementSize;
247                  iter += rowSize;
248               }
249            }
250            itera += imageSize;
251         }
252      }
253   }
254
255   /* Setup store modes that describe what we just did */
256   if (modes) {
257      if (dim < 3) {
258         (void) memcpy(modes, __glXDefaultPixelStore + 4, 20);
259      }
260      else {
261         (void) memcpy(modes, __glXDefaultPixelStore + 0, 36);
262      }
263   }
264}
265
266/*
267** Empty a bitmap in LSB_FIRST=GL_FALSE and ALIGNMENT=4 format packing it
268** into the clients memory using the pixel store PACK modes.
269*/
270static void
271EmptyBitmap(__GLXcontext * gc, GLint width, GLint height,
272            GLenum format, const GLubyte * sourceImage, GLvoid * userdata)
273{
274   const __GLXattribute *state = gc->client_state_private;
275   GLint rowLength = state->storePack.rowLength;
276   GLint alignment = state->storePack.alignment;
277   GLint skipPixels = state->storePack.skipPixels;
278   GLint skipRows = state->storePack.skipRows;
279   GLint lsbFirst = state->storePack.lsbFirst;
280   GLint components, groupsPerRow, rowSize, padding, elementsPerRow;
281   GLint sourceRowSize, sourcePadding, sourceSkip;
282   GLubyte *start, *iter;
283   GLint elementsLeft, bitOffset, currentByte, highBitMask, lowBitMask;
284   GLint writeMask, i;
285   GLubyte writeByte;
286
287   components = __glElementsPerGroup(format, GL_BITMAP);
288   if (rowLength > 0) {
289      groupsPerRow = rowLength;
290   }
291   else {
292      groupsPerRow = width;
293   }
294
295   rowSize = (groupsPerRow * components + 7) >> 3;
296   padding = (rowSize % alignment);
297   if (padding) {
298      rowSize += alignment - padding;
299   }
300   sourceRowSize = (width * components + 7) >> 3;
301   sourcePadding = (sourceRowSize % 4);
302   if (sourcePadding) {
303      sourceSkip = 4 - sourcePadding;
304   }
305   else {
306      sourceSkip = 0;
307   }
308   start = ((GLubyte *) userdata) + skipRows * rowSize +
309      ((skipPixels * components) >> 3);
310   bitOffset = (skipPixels * components) & 7;
311   highBitMask = LowBitsMask[8 - bitOffset];
312   lowBitMask = HighBitsMask[bitOffset];
313   elementsPerRow = width * components;
314   for (i = 0; i < height; i++) {
315      elementsLeft = elementsPerRow;
316      iter = start;
317      writeMask = highBitMask;
318      writeByte = 0;
319      while (elementsLeft) {
320         /* Set up writeMask (to write to current byte) */
321         if (elementsLeft + bitOffset < 8) {
322            /* Need to trim writeMask */
323            writeMask &= HighBitsMask[bitOffset + elementsLeft];
324         }
325
326         if (lsbFirst) {
327            currentByte = MsbToLsbTable[iter[0]];
328         }
329         else {
330            currentByte = iter[0];
331         }
332
333         if (bitOffset) {
334            writeByte |= (sourceImage[0] >> bitOffset);
335            currentByte = (currentByte & ~writeMask) |
336               (writeByte & writeMask);
337            writeByte = (sourceImage[0] << (8 - bitOffset));
338         }
339         else {
340            currentByte = (currentByte & ~writeMask) |
341               (sourceImage[0] & writeMask);
342         }
343
344         if (lsbFirst) {
345            iter[0] = MsbToLsbTable[currentByte];
346         }
347         else {
348            iter[0] = currentByte;
349         }
350
351         if (elementsLeft >= 8) {
352            elementsLeft -= 8;
353         }
354         else {
355            elementsLeft = 0;
356         }
357         sourceImage++;
358         iter++;
359         writeMask = 0xff;
360      }
361      if (writeByte) {
362         /* Some data left over that still needs writing */
363         writeMask &= lowBitMask;
364         if (lsbFirst) {
365            currentByte = MsbToLsbTable[iter[0]];
366         }
367         else {
368            currentByte = iter[0];
369         }
370         currentByte = (currentByte & ~writeMask) | (writeByte & writeMask);
371         if (lsbFirst) {
372            iter[0] = MsbToLsbTable[currentByte];
373         }
374         else {
375            iter[0] = currentByte;
376         }
377      }
378      start += rowSize;
379      sourceImage += sourceSkip;
380   }
381}
382
383/*
384** Insert array into user's data applying all pixel store modes.
385** The packed array format from the server is LSB_FIRST = FALSE,
386** SWAP_BYTES = the current pixel storage pack mode, and ALIGNMENT = 4.
387** Named __glEmptyImage() because it is the opposite of __glFillImage().
388*/
389/* ARGSUSED */
390void
391__glEmptyImage(__GLXcontext * gc, GLint dim, GLint width, GLint height,
392               GLint depth, GLenum format, GLenum type,
393               const GLubyte * sourceImage, GLvoid * userdata)
394{
395   const __GLXattribute *state = gc->client_state_private;
396   GLint rowLength = state->storePack.rowLength;
397   GLint imageHeight = state->storePack.imageHeight;
398   GLint alignment = state->storePack.alignment;
399   GLint skipPixels = state->storePack.skipPixels;
400   GLint skipRows = state->storePack.skipRows;
401   GLint skipImages = state->storePack.skipImages;
402   GLint components, elementSize, rowSize, padding, groupsPerRow, groupSize;
403   GLint elementsPerRow, sourceRowSize, sourcePadding, h, i;
404   GLint imageSize, rowsPerImage;
405   GLubyte *start, *iter, *itera;
406
407   if (type == GL_BITMAP) {
408      EmptyBitmap(gc, width, height, format, sourceImage, userdata);
409   }
410   else {
411      components = __glElementsPerGroup(format, type);
412      if (rowLength > 0) {
413         groupsPerRow = rowLength;
414      }
415      else {
416         groupsPerRow = width;
417      }
418      if (imageHeight > 0) {
419         rowsPerImage = imageHeight;
420      }
421      else {
422         rowsPerImage = height;
423      }
424      elementSize = __glBytesPerElement(type);
425      groupSize = elementSize * components;
426      rowSize = groupsPerRow * groupSize;
427      padding = (rowSize % alignment);
428      if (padding) {
429         rowSize += alignment - padding;
430      }
431      sourceRowSize = width * groupSize;
432      sourcePadding = (sourceRowSize % 4);
433      if (sourcePadding) {
434         sourceRowSize += 4 - sourcePadding;
435      }
436      imageSize = sourceRowSize * rowsPerImage;
437      start = ((GLubyte *) userdata) + skipImages * imageSize +
438         skipRows * rowSize + skipPixels * groupSize;
439      elementsPerRow = width * components;
440
441      itera = start;
442      for (h = 0; h < depth; h++) {
443         if ((rowSize == sourceRowSize) && (sourcePadding == 0)) {
444            /* Ha!  This is mondo easy! */
445            __GLX_MEM_COPY(itera, sourceImage,
446                           elementsPerRow * elementSize * height);
447            sourceImage += elementsPerRow * elementSize * height;
448         }
449         else {
450            iter = itera;
451            for (i = 0; i < height; i++) {
452               __GLX_MEM_COPY(iter, sourceImage,
453                              elementsPerRow * elementSize);
454               sourceImage += sourceRowSize;
455               iter += rowSize;
456            }
457         }
458         itera += imageSize;
459      }
460   }
461}
462