Line data Source code
1 : /*
2 : * transupp.c
3 : *
4 : * This file was part of the Independent JPEG Group's software:
5 : * Copyright (C) 1997-2011, Thomas G. Lane, Guido Vollbeding.
6 : * Modifications:
7 : * Copyright (C) 2010, D. R. Commander.
8 : * For conditions of distribution and use, see the accompanying README file.
9 : *
10 : * This file contains image transformation routines and other utility code
11 : * used by the jpegtran sample application. These are NOT part of the core
12 : * JPEG library. But we keep these routines separate from jpegtran.c to
13 : * ease the task of maintaining jpegtran-like programs that have other user
14 : * interfaces.
15 : */
16 :
17 : #include "jerror.h"
18 : #include "jinclude.h"
19 : #include "jpeglib.h"
20 : #include "transupp.h" /* My own external interface */
21 : #include "jpegcomp.h"
22 : #include <ctype.h> /* to declare isdigit() */
23 :
24 : /* Definition of jdiv_round_up is copied here from jutils.c in jpeg-8c.tar.gz,
25 : just as the rest of this file appears to be copied here from transupp.c in
26 : jpeg-8c.tar.gz: */
27 : static long
28 0 : jdiv_round_up (long a, long b)
29 : /* Compute a/b rounded up to next integer, ie, ceil(a/b) */
30 : /* Assumes a >= 0, b > 0 */
31 : {
32 0 : return (a + b - 1L) / b;
33 : }
34 :
35 : #if JPEG_LIB_VERSION >= 70
36 : #define dstinfo_min_DCT_h_scaled_size dstinfo->min_DCT_h_scaled_size
37 : #define dstinfo_min_DCT_v_scaled_size dstinfo->min_DCT_v_scaled_size
38 : #else
39 : #define dstinfo_min_DCT_h_scaled_size DCTSIZE
40 : #define dstinfo_min_DCT_v_scaled_size DCTSIZE
41 : #endif
42 :
43 :
44 : #if TRANSFORMS_SUPPORTED
45 :
46 : /*
47 : * Lossless image transformation routines. These routines work on DCT
48 : * coefficient arrays and thus do not require any lossy decompression
49 : * or recompression of the image.
50 : * Thanks to Guido Vollbeding for the initial design and code of this feature,
51 : * and to Ben Jackson for introducing the cropping feature.
52 : *
53 : * Horizontal flipping is done in-place, using a single top-to-bottom
54 : * pass through the virtual source array. It will thus be much the
55 : * fastest option for images larger than main memory.
56 : *
57 : * The other routines require a set of destination virtual arrays, so they
58 : * need twice as much memory as jpegtran normally does. The destination
59 : * arrays are always written in normal scan order (top to bottom) because
60 : * the virtual array manager expects this. The source arrays will be scanned
61 : * in the corresponding order, which means multiple passes through the source
62 : * arrays for most of the transforms. That could result in much thrashing
63 : * if the image is larger than main memory.
64 : *
65 : * If cropping or trimming is involved, the destination arrays may be smaller
66 : * than the source arrays. Note it is not possible to do horizontal flip
67 : * in-place when a nonzero Y crop offset is specified, since we'd have to move
68 : * data from one block row to another but the virtual array manager doesn't
69 : * guarantee we can touch more than one row at a time. So in that case,
70 : * we have to use a separate destination array.
71 : *
72 : * Some notes about the operating environment of the individual transform
73 : * routines:
74 : * 1. Both the source and destination virtual arrays are allocated from the
75 : * source JPEG object, and therefore should be manipulated by calling the
76 : * source's memory manager.
77 : * 2. The destination's component count should be used. It may be smaller
78 : * than the source's when forcing to grayscale.
79 : * 3. Likewise the destination's sampling factors should be used. When
80 : * forcing to grayscale the destination's sampling factors will be all 1,
81 : * and we may as well take that as the effective iMCU size.
82 : * 4. When "trim" is in effect, the destination's dimensions will be the
83 : * trimmed values but the source's will be untrimmed.
84 : * 5. When "crop" is in effect, the destination's dimensions will be the
85 : * cropped values but the source's will be uncropped. Each transform
86 : * routine is responsible for picking up source data starting at the
87 : * correct X and Y offset for the crop region. (The X and Y offsets
88 : * passed to the transform routines are measured in iMCU blocks of the
89 : * destination.)
90 : * 6. All the routines assume that the source and destination buffers are
91 : * padded out to a full iMCU boundary. This is true, although for the
92 : * source buffer it is an undocumented property of jdcoefct.c.
93 : */
94 :
95 0 : static void lcl_jcopy_block_row (JBLOCKROW input_row, JBLOCKROW output_row, JDIMENSION num_blocks)
96 : /* Copy a row of coefficient blocks from one place to another. */
97 : {
98 : #ifdef FMEMCOPY
99 : FMEMCOPY(output_row, input_row, num_blocks * (DCTSIZE2 * SIZEOF(JCOEF)));
100 : #else
101 : register JCOEFPTR inptr, outptr;
102 : register long count;
103 :
104 0 : inptr = (JCOEFPTR) input_row;
105 0 : outptr = (JCOEFPTR) output_row;
106 0 : for (count = (long) num_blocks * DCTSIZE2; count > 0; count--) {
107 0 : *outptr++ = *inptr++;
108 : }
109 : #endif
110 0 : }
111 :
112 : LOCAL(void)
113 0 : do_crop (j_decompress_ptr srcinfo, j_compress_ptr dstinfo,
114 : JDIMENSION x_crop_offset, JDIMENSION y_crop_offset,
115 : jvirt_barray_ptr *src_coef_arrays,
116 : jvirt_barray_ptr *dst_coef_arrays)
117 : /* Crop. This is only used when no rotate/flip is requested with the crop. */
118 : {
119 : JDIMENSION dst_blk_y, x_crop_blocks, y_crop_blocks;
120 : int ci, offset_y;
121 : JBLOCKARRAY src_buffer, dst_buffer;
122 : jpeg_component_info *compptr;
123 :
124 : /* We simply have to copy the right amount of data (the destination's
125 : * image size) starting at the given X and Y offsets in the source.
126 : */
127 0 : for (ci = 0; ci < dstinfo->num_components; ci++) {
128 0 : compptr = dstinfo->comp_info + ci;
129 0 : x_crop_blocks = x_crop_offset * compptr->h_samp_factor;
130 0 : y_crop_blocks = y_crop_offset * compptr->v_samp_factor;
131 0 : for (dst_blk_y = 0; dst_blk_y < compptr->height_in_blocks;
132 0 : dst_blk_y += compptr->v_samp_factor) {
133 0 : dst_buffer = (*srcinfo->mem->access_virt_barray)
134 0 : ((j_common_ptr) srcinfo, dst_coef_arrays[ci], dst_blk_y,
135 0 : (JDIMENSION) compptr->v_samp_factor, TRUE);
136 0 : src_buffer = (*srcinfo->mem->access_virt_barray)
137 0 : ((j_common_ptr) srcinfo, src_coef_arrays[ci],
138 : dst_blk_y + y_crop_blocks,
139 0 : (JDIMENSION) compptr->v_samp_factor, FALSE);
140 0 : for (offset_y = 0; offset_y < compptr->v_samp_factor; offset_y++) {
141 0 : lcl_jcopy_block_row(src_buffer[offset_y] + x_crop_blocks,
142 0 : dst_buffer[offset_y],
143 : compptr->width_in_blocks);
144 : }
145 : }
146 : }
147 0 : }
148 :
149 :
150 : LOCAL(void)
151 0 : do_flip_h_no_crop (j_decompress_ptr srcinfo, j_compress_ptr dstinfo,
152 : JDIMENSION x_crop_offset,
153 : jvirt_barray_ptr *src_coef_arrays)
154 : /* Horizontal flip; done in-place, so no separate dest array is required.
155 : * NB: this only works when y_crop_offset is zero.
156 : */
157 : {
158 : JDIMENSION MCU_cols, comp_width, blk_x, blk_y, x_crop_blocks;
159 : int ci, k, offset_y;
160 : JBLOCKARRAY buffer;
161 : JCOEFPTR ptr1, ptr2;
162 : JCOEF temp1, temp2;
163 : jpeg_component_info *compptr;
164 :
165 : /* Horizontal mirroring of DCT blocks is accomplished by swapping
166 : * pairs of blocks in-place. Within a DCT block, we perform horizontal
167 : * mirroring by changing the signs of odd-numbered columns.
168 : * Partial iMCUs at the right edge are left untouched.
169 : */
170 0 : MCU_cols = srcinfo->output_width /
171 0 : (dstinfo->max_h_samp_factor * dstinfo_min_DCT_h_scaled_size);
172 :
173 0 : for (ci = 0; ci < dstinfo->num_components; ci++) {
174 0 : compptr = dstinfo->comp_info + ci;
175 0 : comp_width = MCU_cols * compptr->h_samp_factor;
176 0 : x_crop_blocks = x_crop_offset * compptr->h_samp_factor;
177 0 : for (blk_y = 0; blk_y < compptr->height_in_blocks;
178 0 : blk_y += compptr->v_samp_factor) {
179 0 : buffer = (*srcinfo->mem->access_virt_barray)
180 0 : ((j_common_ptr) srcinfo, src_coef_arrays[ci], blk_y,
181 0 : (JDIMENSION) compptr->v_samp_factor, TRUE);
182 0 : for (offset_y = 0; offset_y < compptr->v_samp_factor; offset_y++) {
183 : /* Do the mirroring */
184 0 : for (blk_x = 0; blk_x * 2 < comp_width; blk_x++) {
185 0 : ptr1 = buffer[offset_y][blk_x];
186 0 : ptr2 = buffer[offset_y][comp_width - blk_x - 1];
187 : /* this unrolled loop doesn't need to know which row it's on... */
188 0 : for (k = 0; k < DCTSIZE2; k += 2) {
189 0 : temp1 = *ptr1; /* swap even column */
190 0 : temp2 = *ptr2;
191 0 : *ptr1++ = temp2;
192 0 : *ptr2++ = temp1;
193 0 : temp1 = *ptr1; /* swap odd column with sign change */
194 0 : temp2 = *ptr2;
195 0 : *ptr1++ = -temp2;
196 0 : *ptr2++ = -temp1;
197 : }
198 : }
199 0 : if (x_crop_blocks > 0) {
200 : /* Now left-justify the portion of the data to be kept.
201 : * We can't use a single lcl_jcopy_block_row() call because that routine
202 : * depends on memcpy(), whose behavior is unspecified for overlapping
203 : * source and destination areas. Sigh.
204 : */
205 0 : for (blk_x = 0; blk_x < compptr->width_in_blocks; blk_x++) {
206 0 : lcl_jcopy_block_row(buffer[offset_y] + blk_x + x_crop_blocks,
207 0 : buffer[offset_y] + blk_x,
208 : (JDIMENSION) 1);
209 : }
210 : }
211 : }
212 : }
213 : }
214 0 : }
215 :
216 :
217 : LOCAL(void)
218 0 : do_flip_h (j_decompress_ptr srcinfo, j_compress_ptr dstinfo,
219 : JDIMENSION x_crop_offset, JDIMENSION y_crop_offset,
220 : jvirt_barray_ptr *src_coef_arrays,
221 : jvirt_barray_ptr *dst_coef_arrays)
222 : /* Horizontal flip in general cropping case */
223 : {
224 : JDIMENSION MCU_cols, comp_width, dst_blk_x, dst_blk_y;
225 : JDIMENSION x_crop_blocks, y_crop_blocks;
226 : int ci, k, offset_y;
227 : JBLOCKARRAY src_buffer, dst_buffer;
228 : JBLOCKROW src_row_ptr, dst_row_ptr;
229 : JCOEFPTR src_ptr, dst_ptr;
230 : jpeg_component_info *compptr;
231 :
232 : /* Here we must output into a separate array because we can't touch
233 : * different rows of a single virtual array simultaneously. Otherwise,
234 : * this is essentially the same as the routine above.
235 : */
236 0 : MCU_cols = srcinfo->output_width /
237 0 : (dstinfo->max_h_samp_factor * dstinfo_min_DCT_h_scaled_size);
238 :
239 0 : for (ci = 0; ci < dstinfo->num_components; ci++) {
240 0 : compptr = dstinfo->comp_info + ci;
241 0 : comp_width = MCU_cols * compptr->h_samp_factor;
242 0 : x_crop_blocks = x_crop_offset * compptr->h_samp_factor;
243 0 : y_crop_blocks = y_crop_offset * compptr->v_samp_factor;
244 0 : for (dst_blk_y = 0; dst_blk_y < compptr->height_in_blocks;
245 0 : dst_blk_y += compptr->v_samp_factor) {
246 0 : dst_buffer = (*srcinfo->mem->access_virt_barray)
247 0 : ((j_common_ptr) srcinfo, dst_coef_arrays[ci], dst_blk_y,
248 0 : (JDIMENSION) compptr->v_samp_factor, TRUE);
249 0 : src_buffer = (*srcinfo->mem->access_virt_barray)
250 0 : ((j_common_ptr) srcinfo, src_coef_arrays[ci],
251 : dst_blk_y + y_crop_blocks,
252 0 : (JDIMENSION) compptr->v_samp_factor, FALSE);
253 0 : for (offset_y = 0; offset_y < compptr->v_samp_factor; offset_y++) {
254 0 : dst_row_ptr = dst_buffer[offset_y];
255 0 : src_row_ptr = src_buffer[offset_y];
256 0 : for (dst_blk_x = 0; dst_blk_x < compptr->width_in_blocks; dst_blk_x++) {
257 0 : if (x_crop_blocks + dst_blk_x < comp_width) {
258 : /* Do the mirrorable blocks */
259 0 : dst_ptr = dst_row_ptr[dst_blk_x];
260 0 : src_ptr = src_row_ptr[comp_width - x_crop_blocks - dst_blk_x - 1];
261 : /* this unrolled loop doesn't need to know which row it's on... */
262 0 : for (k = 0; k < DCTSIZE2; k += 2) {
263 0 : *dst_ptr++ = *src_ptr++; /* copy even column */
264 0 : *dst_ptr++ = - *src_ptr++; /* copy odd column with sign change */
265 : }
266 : } else {
267 : /* Copy last partial block(s) verbatim */
268 0 : lcl_jcopy_block_row(src_row_ptr + dst_blk_x + x_crop_blocks,
269 0 : dst_row_ptr + dst_blk_x,
270 : (JDIMENSION) 1);
271 : }
272 : }
273 : }
274 : }
275 : }
276 0 : }
277 :
278 :
279 : LOCAL(void)
280 0 : do_flip_v (j_decompress_ptr srcinfo, j_compress_ptr dstinfo,
281 : JDIMENSION x_crop_offset, JDIMENSION y_crop_offset,
282 : jvirt_barray_ptr *src_coef_arrays,
283 : jvirt_barray_ptr *dst_coef_arrays)
284 : /* Vertical flip */
285 : {
286 : JDIMENSION MCU_rows, comp_height, dst_blk_x, dst_blk_y;
287 : JDIMENSION x_crop_blocks, y_crop_blocks;
288 : int ci, i, j, offset_y;
289 : JBLOCKARRAY src_buffer, dst_buffer;
290 : JBLOCKROW src_row_ptr, dst_row_ptr;
291 : JCOEFPTR src_ptr, dst_ptr;
292 : jpeg_component_info *compptr;
293 :
294 : /* We output into a separate array because we can't touch different
295 : * rows of the source virtual array simultaneously. Otherwise, this
296 : * is a pretty straightforward analog of horizontal flip.
297 : * Within a DCT block, vertical mirroring is done by changing the signs
298 : * of odd-numbered rows.
299 : * Partial iMCUs at the bottom edge are copied verbatim.
300 : */
301 0 : MCU_rows = srcinfo->output_height /
302 0 : (dstinfo->max_v_samp_factor * dstinfo_min_DCT_v_scaled_size);
303 :
304 0 : for (ci = 0; ci < dstinfo->num_components; ci++) {
305 0 : compptr = dstinfo->comp_info + ci;
306 0 : comp_height = MCU_rows * compptr->v_samp_factor;
307 0 : x_crop_blocks = x_crop_offset * compptr->h_samp_factor;
308 0 : y_crop_blocks = y_crop_offset * compptr->v_samp_factor;
309 0 : for (dst_blk_y = 0; dst_blk_y < compptr->height_in_blocks;
310 0 : dst_blk_y += compptr->v_samp_factor) {
311 0 : dst_buffer = (*srcinfo->mem->access_virt_barray)
312 0 : ((j_common_ptr) srcinfo, dst_coef_arrays[ci], dst_blk_y,
313 0 : (JDIMENSION) compptr->v_samp_factor, TRUE);
314 0 : if (y_crop_blocks + dst_blk_y < comp_height) {
315 : /* Row is within the mirrorable area. */
316 0 : src_buffer = (*srcinfo->mem->access_virt_barray)
317 0 : ((j_common_ptr) srcinfo, src_coef_arrays[ci],
318 0 : comp_height - y_crop_blocks - dst_blk_y -
319 0 : (JDIMENSION) compptr->v_samp_factor,
320 0 : (JDIMENSION) compptr->v_samp_factor, FALSE);
321 : } else {
322 : /* Bottom-edge blocks will be copied verbatim. */
323 0 : src_buffer = (*srcinfo->mem->access_virt_barray)
324 0 : ((j_common_ptr) srcinfo, src_coef_arrays[ci],
325 : dst_blk_y + y_crop_blocks,
326 0 : (JDIMENSION) compptr->v_samp_factor, FALSE);
327 : }
328 0 : for (offset_y = 0; offset_y < compptr->v_samp_factor; offset_y++) {
329 0 : if (y_crop_blocks + dst_blk_y < comp_height) {
330 : /* Row is within the mirrorable area. */
331 0 : dst_row_ptr = dst_buffer[offset_y];
332 0 : src_row_ptr = src_buffer[compptr->v_samp_factor - offset_y - 1];
333 0 : src_row_ptr += x_crop_blocks;
334 0 : for (dst_blk_x = 0; dst_blk_x < compptr->width_in_blocks;
335 0 : dst_blk_x++) {
336 0 : dst_ptr = dst_row_ptr[dst_blk_x];
337 0 : src_ptr = src_row_ptr[dst_blk_x];
338 0 : for (i = 0; i < DCTSIZE; i += 2) {
339 : /* copy even row */
340 0 : for (j = 0; j < DCTSIZE; j++)
341 0 : *dst_ptr++ = *src_ptr++;
342 : /* copy odd row with sign change */
343 0 : for (j = 0; j < DCTSIZE; j++)
344 0 : *dst_ptr++ = - *src_ptr++;
345 : }
346 : }
347 : } else {
348 : /* Just copy row verbatim. */
349 0 : lcl_jcopy_block_row(src_buffer[offset_y] + x_crop_blocks,
350 0 : dst_buffer[offset_y],
351 : compptr->width_in_blocks);
352 : }
353 : }
354 : }
355 : }
356 0 : }
357 :
358 :
359 : LOCAL(void)
360 0 : do_transpose (j_decompress_ptr srcinfo, j_compress_ptr dstinfo,
361 : JDIMENSION x_crop_offset, JDIMENSION y_crop_offset,
362 : jvirt_barray_ptr *src_coef_arrays,
363 : jvirt_barray_ptr *dst_coef_arrays)
364 : /* Transpose source into destination */
365 : {
366 : JDIMENSION dst_blk_x, dst_blk_y, x_crop_blocks, y_crop_blocks;
367 : int ci, i, j, offset_x, offset_y;
368 : JBLOCKARRAY src_buffer, dst_buffer;
369 : JCOEFPTR src_ptr, dst_ptr;
370 : jpeg_component_info *compptr;
371 :
372 : /* Transposing pixels within a block just requires transposing the
373 : * DCT coefficients.
374 : * Partial iMCUs at the edges require no special treatment; we simply
375 : * process all the available DCT blocks for every component.
376 : */
377 0 : for (ci = 0; ci < dstinfo->num_components; ci++) {
378 0 : compptr = dstinfo->comp_info + ci;
379 0 : x_crop_blocks = x_crop_offset * compptr->h_samp_factor;
380 0 : y_crop_blocks = y_crop_offset * compptr->v_samp_factor;
381 0 : for (dst_blk_y = 0; dst_blk_y < compptr->height_in_blocks;
382 0 : dst_blk_y += compptr->v_samp_factor) {
383 0 : dst_buffer = (*srcinfo->mem->access_virt_barray)
384 0 : ((j_common_ptr) srcinfo, dst_coef_arrays[ci], dst_blk_y,
385 0 : (JDIMENSION) compptr->v_samp_factor, TRUE);
386 0 : for (offset_y = 0; offset_y < compptr->v_samp_factor; offset_y++) {
387 0 : for (dst_blk_x = 0; dst_blk_x < compptr->width_in_blocks;
388 0 : dst_blk_x += compptr->h_samp_factor) {
389 0 : src_buffer = (*srcinfo->mem->access_virt_barray)
390 0 : ((j_common_ptr) srcinfo, src_coef_arrays[ci],
391 : dst_blk_x + x_crop_blocks,
392 0 : (JDIMENSION) compptr->h_samp_factor, FALSE);
393 0 : for (offset_x = 0; offset_x < compptr->h_samp_factor; offset_x++) {
394 0 : dst_ptr = dst_buffer[offset_y][dst_blk_x + offset_x];
395 0 : src_ptr = src_buffer[offset_x][dst_blk_y + offset_y + y_crop_blocks];
396 0 : for (i = 0; i < DCTSIZE; i++)
397 0 : for (j = 0; j < DCTSIZE; j++)
398 0 : dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j];
399 : }
400 : }
401 : }
402 : }
403 : }
404 0 : }
405 :
406 :
407 : LOCAL(void)
408 0 : do_rot_90 (j_decompress_ptr srcinfo, j_compress_ptr dstinfo,
409 : JDIMENSION x_crop_offset, JDIMENSION y_crop_offset,
410 : jvirt_barray_ptr *src_coef_arrays,
411 : jvirt_barray_ptr *dst_coef_arrays)
412 : /* 90 degree rotation is equivalent to
413 : * 1. Transposing the image;
414 : * 2. Horizontal mirroring.
415 : * These two steps are merged into a single processing routine.
416 : */
417 : {
418 : JDIMENSION MCU_cols, comp_width, dst_blk_x, dst_blk_y;
419 : JDIMENSION x_crop_blocks, y_crop_blocks;
420 : int ci, i, j, offset_x, offset_y;
421 : JBLOCKARRAY src_buffer, dst_buffer;
422 : JCOEFPTR src_ptr, dst_ptr;
423 : jpeg_component_info *compptr;
424 :
425 : /* Because of the horizontal mirror step, we can't process partial iMCUs
426 : * at the (output) right edge properly. They just get transposed and
427 : * not mirrored.
428 : */
429 0 : MCU_cols = srcinfo->output_height /
430 0 : (dstinfo->max_h_samp_factor * dstinfo_min_DCT_h_scaled_size);
431 :
432 0 : for (ci = 0; ci < dstinfo->num_components; ci++) {
433 0 : compptr = dstinfo->comp_info + ci;
434 0 : comp_width = MCU_cols * compptr->h_samp_factor;
435 0 : x_crop_blocks = x_crop_offset * compptr->h_samp_factor;
436 0 : y_crop_blocks = y_crop_offset * compptr->v_samp_factor;
437 0 : for (dst_blk_y = 0; dst_blk_y < compptr->height_in_blocks;
438 0 : dst_blk_y += compptr->v_samp_factor) {
439 0 : dst_buffer = (*srcinfo->mem->access_virt_barray)
440 0 : ((j_common_ptr) srcinfo, dst_coef_arrays[ci], dst_blk_y,
441 0 : (JDIMENSION) compptr->v_samp_factor, TRUE);
442 0 : for (offset_y = 0; offset_y < compptr->v_samp_factor; offset_y++) {
443 0 : for (dst_blk_x = 0; dst_blk_x < compptr->width_in_blocks;
444 0 : dst_blk_x += compptr->h_samp_factor) {
445 0 : if (x_crop_blocks + dst_blk_x < comp_width) {
446 : /* Block is within the mirrorable area. */
447 0 : src_buffer = (*srcinfo->mem->access_virt_barray)
448 0 : ((j_common_ptr) srcinfo, src_coef_arrays[ci],
449 0 : comp_width - x_crop_blocks - dst_blk_x -
450 0 : (JDIMENSION) compptr->h_samp_factor,
451 0 : (JDIMENSION) compptr->h_samp_factor, FALSE);
452 : } else {
453 : /* Edge blocks are transposed but not mirrored. */
454 0 : src_buffer = (*srcinfo->mem->access_virt_barray)
455 0 : ((j_common_ptr) srcinfo, src_coef_arrays[ci],
456 : dst_blk_x + x_crop_blocks,
457 0 : (JDIMENSION) compptr->h_samp_factor, FALSE);
458 : }
459 0 : for (offset_x = 0; offset_x < compptr->h_samp_factor; offset_x++) {
460 0 : dst_ptr = dst_buffer[offset_y][dst_blk_x + offset_x];
461 0 : if (x_crop_blocks + dst_blk_x < comp_width) {
462 : /* Block is within the mirrorable area. */
463 0 : src_ptr = src_buffer[compptr->h_samp_factor - offset_x - 1]
464 0 : [dst_blk_y + offset_y + y_crop_blocks];
465 0 : for (i = 0; i < DCTSIZE; i++) {
466 0 : for (j = 0; j < DCTSIZE; j++)
467 0 : dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j];
468 0 : i++;
469 0 : for (j = 0; j < DCTSIZE; j++)
470 0 : dst_ptr[j*DCTSIZE+i] = -src_ptr[i*DCTSIZE+j];
471 : }
472 : } else {
473 : /* Edge blocks are transposed but not mirrored. */
474 0 : src_ptr = src_buffer[offset_x]
475 0 : [dst_blk_y + offset_y + y_crop_blocks];
476 0 : for (i = 0; i < DCTSIZE; i++)
477 0 : for (j = 0; j < DCTSIZE; j++)
478 0 : dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j];
479 : }
480 : }
481 : }
482 : }
483 : }
484 : }
485 0 : }
486 :
487 :
488 : LOCAL(void)
489 0 : do_rot_270 (j_decompress_ptr srcinfo, j_compress_ptr dstinfo,
490 : JDIMENSION x_crop_offset, JDIMENSION y_crop_offset,
491 : jvirt_barray_ptr *src_coef_arrays,
492 : jvirt_barray_ptr *dst_coef_arrays)
493 : /* 270 degree rotation is equivalent to
494 : * 1. Horizontal mirroring;
495 : * 2. Transposing the image.
496 : * These two steps are merged into a single processing routine.
497 : */
498 : {
499 : JDIMENSION MCU_rows, comp_height, dst_blk_x, dst_blk_y;
500 : JDIMENSION x_crop_blocks, y_crop_blocks;
501 : int ci, i, j, offset_x, offset_y;
502 : JBLOCKARRAY src_buffer, dst_buffer;
503 : JCOEFPTR src_ptr, dst_ptr;
504 : jpeg_component_info *compptr;
505 :
506 : /* Because of the horizontal mirror step, we can't process partial iMCUs
507 : * at the (output) bottom edge properly. They just get transposed and
508 : * not mirrored.
509 : */
510 0 : MCU_rows = srcinfo->output_width /
511 0 : (dstinfo->max_v_samp_factor * dstinfo_min_DCT_v_scaled_size);
512 :
513 0 : for (ci = 0; ci < dstinfo->num_components; ci++) {
514 0 : compptr = dstinfo->comp_info + ci;
515 0 : comp_height = MCU_rows * compptr->v_samp_factor;
516 0 : x_crop_blocks = x_crop_offset * compptr->h_samp_factor;
517 0 : y_crop_blocks = y_crop_offset * compptr->v_samp_factor;
518 0 : for (dst_blk_y = 0; dst_blk_y < compptr->height_in_blocks;
519 0 : dst_blk_y += compptr->v_samp_factor) {
520 0 : dst_buffer = (*srcinfo->mem->access_virt_barray)
521 0 : ((j_common_ptr) srcinfo, dst_coef_arrays[ci], dst_blk_y,
522 0 : (JDIMENSION) compptr->v_samp_factor, TRUE);
523 0 : for (offset_y = 0; offset_y < compptr->v_samp_factor; offset_y++) {
524 0 : for (dst_blk_x = 0; dst_blk_x < compptr->width_in_blocks;
525 0 : dst_blk_x += compptr->h_samp_factor) {
526 0 : src_buffer = (*srcinfo->mem->access_virt_barray)
527 0 : ((j_common_ptr) srcinfo, src_coef_arrays[ci],
528 : dst_blk_x + x_crop_blocks,
529 0 : (JDIMENSION) compptr->h_samp_factor, FALSE);
530 0 : for (offset_x = 0; offset_x < compptr->h_samp_factor; offset_x++) {
531 0 : dst_ptr = dst_buffer[offset_y][dst_blk_x + offset_x];
532 0 : if (y_crop_blocks + dst_blk_y < comp_height) {
533 : /* Block is within the mirrorable area. */
534 0 : src_ptr = src_buffer[offset_x]
535 0 : [comp_height - y_crop_blocks - dst_blk_y - offset_y - 1];
536 0 : for (i = 0; i < DCTSIZE; i++) {
537 0 : for (j = 0; j < DCTSIZE; j++) {
538 0 : dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j];
539 0 : j++;
540 0 : dst_ptr[j*DCTSIZE+i] = -src_ptr[i*DCTSIZE+j];
541 : }
542 : }
543 : } else {
544 : /* Edge blocks are transposed but not mirrored. */
545 0 : src_ptr = src_buffer[offset_x]
546 0 : [dst_blk_y + offset_y + y_crop_blocks];
547 0 : for (i = 0; i < DCTSIZE; i++)
548 0 : for (j = 0; j < DCTSIZE; j++)
549 0 : dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j];
550 : }
551 : }
552 : }
553 : }
554 : }
555 : }
556 0 : }
557 :
558 :
559 : LOCAL(void)
560 0 : do_rot_180 (j_decompress_ptr srcinfo, j_compress_ptr dstinfo,
561 : JDIMENSION x_crop_offset, JDIMENSION y_crop_offset,
562 : jvirt_barray_ptr *src_coef_arrays,
563 : jvirt_barray_ptr *dst_coef_arrays)
564 : /* 180 degree rotation is equivalent to
565 : * 1. Vertical mirroring;
566 : * 2. Horizontal mirroring.
567 : * These two steps are merged into a single processing routine.
568 : */
569 : {
570 : JDIMENSION MCU_cols, MCU_rows, comp_width, comp_height, dst_blk_x, dst_blk_y;
571 : JDIMENSION x_crop_blocks, y_crop_blocks;
572 : int ci, i, j, offset_y;
573 : JBLOCKARRAY src_buffer, dst_buffer;
574 : JBLOCKROW src_row_ptr, dst_row_ptr;
575 : JCOEFPTR src_ptr, dst_ptr;
576 : jpeg_component_info *compptr;
577 :
578 0 : MCU_cols = srcinfo->output_width /
579 0 : (dstinfo->max_h_samp_factor * dstinfo_min_DCT_h_scaled_size);
580 0 : MCU_rows = srcinfo->output_height /
581 0 : (dstinfo->max_v_samp_factor * dstinfo_min_DCT_v_scaled_size);
582 :
583 0 : for (ci = 0; ci < dstinfo->num_components; ci++) {
584 0 : compptr = dstinfo->comp_info + ci;
585 0 : comp_width = MCU_cols * compptr->h_samp_factor;
586 0 : comp_height = MCU_rows * compptr->v_samp_factor;
587 0 : x_crop_blocks = x_crop_offset * compptr->h_samp_factor;
588 0 : y_crop_blocks = y_crop_offset * compptr->v_samp_factor;
589 0 : for (dst_blk_y = 0; dst_blk_y < compptr->height_in_blocks;
590 0 : dst_blk_y += compptr->v_samp_factor) {
591 0 : dst_buffer = (*srcinfo->mem->access_virt_barray)
592 0 : ((j_common_ptr) srcinfo, dst_coef_arrays[ci], dst_blk_y,
593 0 : (JDIMENSION) compptr->v_samp_factor, TRUE);
594 0 : if (y_crop_blocks + dst_blk_y < comp_height) {
595 : /* Row is within the vertically mirrorable area. */
596 0 : src_buffer = (*srcinfo->mem->access_virt_barray)
597 0 : ((j_common_ptr) srcinfo, src_coef_arrays[ci],
598 0 : comp_height - y_crop_blocks - dst_blk_y -
599 0 : (JDIMENSION) compptr->v_samp_factor,
600 0 : (JDIMENSION) compptr->v_samp_factor, FALSE);
601 : } else {
602 : /* Bottom-edge rows are only mirrored horizontally. */
603 0 : src_buffer = (*srcinfo->mem->access_virt_barray)
604 0 : ((j_common_ptr) srcinfo, src_coef_arrays[ci],
605 : dst_blk_y + y_crop_blocks,
606 0 : (JDIMENSION) compptr->v_samp_factor, FALSE);
607 : }
608 0 : for (offset_y = 0; offset_y < compptr->v_samp_factor; offset_y++) {
609 0 : dst_row_ptr = dst_buffer[offset_y];
610 0 : if (y_crop_blocks + dst_blk_y < comp_height) {
611 : /* Row is within the mirrorable area. */
612 0 : src_row_ptr = src_buffer[compptr->v_samp_factor - offset_y - 1];
613 0 : for (dst_blk_x = 0; dst_blk_x < compptr->width_in_blocks; dst_blk_x++) {
614 0 : dst_ptr = dst_row_ptr[dst_blk_x];
615 0 : if (x_crop_blocks + dst_blk_x < comp_width) {
616 : /* Process the blocks that can be mirrored both ways. */
617 0 : src_ptr = src_row_ptr[comp_width - x_crop_blocks - dst_blk_x - 1];
618 0 : for (i = 0; i < DCTSIZE; i += 2) {
619 : /* For even row, negate every odd column. */
620 0 : for (j = 0; j < DCTSIZE; j += 2) {
621 0 : *dst_ptr++ = *src_ptr++;
622 0 : *dst_ptr++ = - *src_ptr++;
623 : }
624 : /* For odd row, negate every even column. */
625 0 : for (j = 0; j < DCTSIZE; j += 2) {
626 0 : *dst_ptr++ = - *src_ptr++;
627 0 : *dst_ptr++ = *src_ptr++;
628 : }
629 : }
630 : } else {
631 : /* Any remaining right-edge blocks are only mirrored vertically. */
632 0 : src_ptr = src_row_ptr[x_crop_blocks + dst_blk_x];
633 0 : for (i = 0; i < DCTSIZE; i += 2) {
634 0 : for (j = 0; j < DCTSIZE; j++)
635 0 : *dst_ptr++ = *src_ptr++;
636 0 : for (j = 0; j < DCTSIZE; j++)
637 0 : *dst_ptr++ = - *src_ptr++;
638 : }
639 : }
640 : }
641 : } else {
642 : /* Remaining rows are just mirrored horizontally. */
643 0 : src_row_ptr = src_buffer[offset_y];
644 0 : for (dst_blk_x = 0; dst_blk_x < compptr->width_in_blocks; dst_blk_x++) {
645 0 : if (x_crop_blocks + dst_blk_x < comp_width) {
646 : /* Process the blocks that can be mirrored. */
647 0 : dst_ptr = dst_row_ptr[dst_blk_x];
648 0 : src_ptr = src_row_ptr[comp_width - x_crop_blocks - dst_blk_x - 1];
649 0 : for (i = 0; i < DCTSIZE2; i += 2) {
650 0 : *dst_ptr++ = *src_ptr++;
651 0 : *dst_ptr++ = - *src_ptr++;
652 : }
653 : } else {
654 : /* Any remaining right-edge blocks are only copied. */
655 0 : lcl_jcopy_block_row(src_row_ptr + dst_blk_x + x_crop_blocks,
656 0 : dst_row_ptr + dst_blk_x,
657 : (JDIMENSION) 1);
658 : }
659 : }
660 : }
661 : }
662 : }
663 : }
664 0 : }
665 :
666 :
667 : LOCAL(void)
668 0 : do_transverse (j_decompress_ptr srcinfo, j_compress_ptr dstinfo,
669 : JDIMENSION x_crop_offset, JDIMENSION y_crop_offset,
670 : jvirt_barray_ptr *src_coef_arrays,
671 : jvirt_barray_ptr *dst_coef_arrays)
672 : /* Transverse transpose is equivalent to
673 : * 1. 180 degree rotation;
674 : * 2. Transposition;
675 : * or
676 : * 1. Horizontal mirroring;
677 : * 2. Transposition;
678 : * 3. Horizontal mirroring.
679 : * These steps are merged into a single processing routine.
680 : */
681 : {
682 : JDIMENSION MCU_cols, MCU_rows, comp_width, comp_height, dst_blk_x, dst_blk_y;
683 : JDIMENSION x_crop_blocks, y_crop_blocks;
684 : int ci, i, j, offset_x, offset_y;
685 : JBLOCKARRAY src_buffer, dst_buffer;
686 : JCOEFPTR src_ptr, dst_ptr;
687 : jpeg_component_info *compptr;
688 :
689 0 : MCU_cols = srcinfo->output_height /
690 0 : (dstinfo->max_h_samp_factor * dstinfo_min_DCT_h_scaled_size);
691 0 : MCU_rows = srcinfo->output_width /
692 0 : (dstinfo->max_v_samp_factor * dstinfo_min_DCT_v_scaled_size);
693 :
694 0 : for (ci = 0; ci < dstinfo->num_components; ci++) {
695 0 : compptr = dstinfo->comp_info + ci;
696 0 : comp_width = MCU_cols * compptr->h_samp_factor;
697 0 : comp_height = MCU_rows * compptr->v_samp_factor;
698 0 : x_crop_blocks = x_crop_offset * compptr->h_samp_factor;
699 0 : y_crop_blocks = y_crop_offset * compptr->v_samp_factor;
700 0 : for (dst_blk_y = 0; dst_blk_y < compptr->height_in_blocks;
701 0 : dst_blk_y += compptr->v_samp_factor) {
702 0 : dst_buffer = (*srcinfo->mem->access_virt_barray)
703 0 : ((j_common_ptr) srcinfo, dst_coef_arrays[ci], dst_blk_y,
704 0 : (JDIMENSION) compptr->v_samp_factor, TRUE);
705 0 : for (offset_y = 0; offset_y < compptr->v_samp_factor; offset_y++) {
706 0 : for (dst_blk_x = 0; dst_blk_x < compptr->width_in_blocks;
707 0 : dst_blk_x += compptr->h_samp_factor) {
708 0 : if (x_crop_blocks + dst_blk_x < comp_width) {
709 : /* Block is within the mirrorable area. */
710 0 : src_buffer = (*srcinfo->mem->access_virt_barray)
711 0 : ((j_common_ptr) srcinfo, src_coef_arrays[ci],
712 0 : comp_width - x_crop_blocks - dst_blk_x -
713 0 : (JDIMENSION) compptr->h_samp_factor,
714 0 : (JDIMENSION) compptr->h_samp_factor, FALSE);
715 : } else {
716 0 : src_buffer = (*srcinfo->mem->access_virt_barray)
717 0 : ((j_common_ptr) srcinfo, src_coef_arrays[ci],
718 : dst_blk_x + x_crop_blocks,
719 0 : (JDIMENSION) compptr->h_samp_factor, FALSE);
720 : }
721 0 : for (offset_x = 0; offset_x < compptr->h_samp_factor; offset_x++) {
722 0 : dst_ptr = dst_buffer[offset_y][dst_blk_x + offset_x];
723 0 : if (y_crop_blocks + dst_blk_y < comp_height) {
724 0 : if (x_crop_blocks + dst_blk_x < comp_width) {
725 : /* Block is within the mirrorable area. */
726 0 : src_ptr = src_buffer[compptr->h_samp_factor - offset_x - 1]
727 0 : [comp_height - y_crop_blocks - dst_blk_y - offset_y - 1];
728 0 : for (i = 0; i < DCTSIZE; i++) {
729 0 : for (j = 0; j < DCTSIZE; j++) {
730 0 : dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j];
731 0 : j++;
732 0 : dst_ptr[j*DCTSIZE+i] = -src_ptr[i*DCTSIZE+j];
733 : }
734 0 : i++;
735 0 : for (j = 0; j < DCTSIZE; j++) {
736 0 : dst_ptr[j*DCTSIZE+i] = -src_ptr[i*DCTSIZE+j];
737 0 : j++;
738 0 : dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j];
739 : }
740 : }
741 : } else {
742 : /* Right-edge blocks are mirrored in y only */
743 0 : src_ptr = src_buffer[offset_x]
744 0 : [comp_height - y_crop_blocks - dst_blk_y - offset_y - 1];
745 0 : for (i = 0; i < DCTSIZE; i++) {
746 0 : for (j = 0; j < DCTSIZE; j++) {
747 0 : dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j];
748 0 : j++;
749 0 : dst_ptr[j*DCTSIZE+i] = -src_ptr[i*DCTSIZE+j];
750 : }
751 : }
752 : }
753 : } else {
754 0 : if (x_crop_blocks + dst_blk_x < comp_width) {
755 : /* Bottom-edge blocks are mirrored in x only */
756 0 : src_ptr = src_buffer[compptr->h_samp_factor - offset_x - 1]
757 0 : [dst_blk_y + offset_y + y_crop_blocks];
758 0 : for (i = 0; i < DCTSIZE; i++) {
759 0 : for (j = 0; j < DCTSIZE; j++)
760 0 : dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j];
761 0 : i++;
762 0 : for (j = 0; j < DCTSIZE; j++)
763 0 : dst_ptr[j*DCTSIZE+i] = -src_ptr[i*DCTSIZE+j];
764 : }
765 : } else {
766 : /* At lower right corner, just transpose, no mirroring */
767 0 : src_ptr = src_buffer[offset_x]
768 0 : [dst_blk_y + offset_y + y_crop_blocks];
769 0 : for (i = 0; i < DCTSIZE; i++)
770 0 : for (j = 0; j < DCTSIZE; j++)
771 0 : dst_ptr[j*DCTSIZE+i] = src_ptr[i*DCTSIZE+j];
772 : }
773 : }
774 : }
775 : }
776 : }
777 : }
778 : }
779 0 : }
780 :
781 :
782 : /* Parse an unsigned integer: subroutine for jtransform_parse_crop_spec.
783 : * Returns TRUE if valid integer found, FALSE if not.
784 : * *strptr is advanced over the digit string, and *result is set to its value.
785 : */
786 :
787 : LOCAL(boolean)
788 0 : jt_read_integer (const char ** strptr, JDIMENSION * result)
789 : {
790 0 : const char * ptr = *strptr;
791 0 : JDIMENSION val = 0;
792 :
793 0 : for (; isdigit(*ptr); ptr++) {
794 0 : val = val * 10 + (JDIMENSION) (*ptr - '0');
795 : }
796 0 : *result = val;
797 0 : if (ptr == *strptr)
798 0 : return FALSE; /* oops, no digits */
799 0 : *strptr = ptr;
800 0 : return TRUE;
801 : }
802 :
803 :
804 : /* Parse a crop specification (written in X11 geometry style).
805 : * The routine returns TRUE if the spec string is valid, FALSE if not.
806 : *
807 : * The crop spec string should have the format
808 : * <width>[f]x<height>[f]{+-}<xoffset>{+-}<yoffset>
809 : * where width, height, xoffset, and yoffset are unsigned integers.
810 : * Each of the elements can be omitted to indicate a default value.
811 : * (A weakness of this style is that it is not possible to omit xoffset
812 : * while specifying yoffset, since they look alike.)
813 : *
814 : * This code is loosely based on XParseGeometry from the X11 distribution.
815 : */
816 :
817 : GLOBAL(boolean)
818 0 : jtransform_parse_crop_spec (jpeg_transform_info *info, const char *spec)
819 : {
820 0 : info->crop = FALSE;
821 0 : info->crop_width_set = JCROP_UNSET;
822 0 : info->crop_height_set = JCROP_UNSET;
823 0 : info->crop_xoffset_set = JCROP_UNSET;
824 0 : info->crop_yoffset_set = JCROP_UNSET;
825 :
826 0 : if (isdigit(*spec)) {
827 : /* fetch width */
828 0 : if (! jt_read_integer(&spec, &info->crop_width))
829 0 : return FALSE;
830 0 : if (*spec == 'f' || *spec == 'F') {
831 0 : spec++;
832 0 : info->crop_width_set = JCROP_FORCE;
833 : } else
834 0 : info->crop_width_set = JCROP_POS;
835 : }
836 0 : if (*spec == 'x' || *spec == 'X') {
837 : /* fetch height */
838 0 : spec++;
839 0 : if (! jt_read_integer(&spec, &info->crop_height))
840 0 : return FALSE;
841 0 : if (*spec == 'f' || *spec == 'F') {
842 0 : spec++;
843 0 : info->crop_height_set = JCROP_FORCE;
844 : } else
845 0 : info->crop_height_set = JCROP_POS;
846 : }
847 0 : if (*spec == '+' || *spec == '-') {
848 : /* fetch xoffset */
849 0 : info->crop_xoffset_set = (*spec == '-') ? JCROP_NEG : JCROP_POS;
850 0 : spec++;
851 0 : if (! jt_read_integer(&spec, &info->crop_xoffset))
852 0 : return FALSE;
853 : }
854 0 : if (*spec == '+' || *spec == '-') {
855 : /* fetch yoffset */
856 0 : info->crop_yoffset_set = (*spec == '-') ? JCROP_NEG : JCROP_POS;
857 0 : spec++;
858 0 : if (! jt_read_integer(&spec, &info->crop_yoffset))
859 0 : return FALSE;
860 : }
861 : /* We had better have gotten to the end of the string. */
862 0 : if (*spec != '\0')
863 0 : return FALSE;
864 0 : info->crop = TRUE;
865 0 : return TRUE;
866 : }
867 :
868 :
869 : /* Trim off any partial iMCUs on the indicated destination edge */
870 :
871 : LOCAL(void)
872 0 : trim_right_edge (jpeg_transform_info *info, JDIMENSION full_width)
873 : {
874 : JDIMENSION MCU_cols;
875 :
876 0 : MCU_cols = info->output_width / info->iMCU_sample_width;
877 0 : if (MCU_cols > 0 && info->x_crop_offset + MCU_cols ==
878 0 : full_width / info->iMCU_sample_width)
879 0 : info->output_width = MCU_cols * info->iMCU_sample_width;
880 0 : }
881 :
882 : LOCAL(void)
883 0 : trim_bottom_edge (jpeg_transform_info *info, JDIMENSION full_height)
884 : {
885 : JDIMENSION MCU_rows;
886 :
887 0 : MCU_rows = info->output_height / info->iMCU_sample_height;
888 0 : if (MCU_rows > 0 && info->y_crop_offset + MCU_rows ==
889 0 : full_height / info->iMCU_sample_height)
890 0 : info->output_height = MCU_rows * info->iMCU_sample_height;
891 0 : }
892 :
893 :
894 : /* Request any required workspace.
895 : *
896 : * This routine figures out the size that the output image will be
897 : * (which implies that all the transform parameters must be set before
898 : * it is called).
899 : *
900 : * We allocate the workspace virtual arrays from the source decompression
901 : * object, so that all the arrays (both the original data and the workspace)
902 : * will be taken into account while making memory management decisions.
903 : * Hence, this routine must be called after jpeg_read_header (which reads
904 : * the image dimensions) and before jpeg_read_coefficients (which realizes
905 : * the source's virtual arrays).
906 : *
907 : * This function returns FALSE right away if -perfect is given
908 : * and transformation is not perfect. Otherwise returns TRUE.
909 : */
910 :
911 : GLOBAL(boolean)
912 0 : jtransform_request_workspace (j_decompress_ptr srcinfo,
913 : jpeg_transform_info *info)
914 : {
915 : jvirt_barray_ptr *coef_arrays;
916 : boolean need_workspace, transpose_it;
917 : jpeg_component_info *compptr;
918 : JDIMENSION xoffset, yoffset;
919 : JDIMENSION width_in_iMCUs, height_in_iMCUs;
920 : JDIMENSION width_in_blocks, height_in_blocks;
921 : int ci, h_samp_factor, v_samp_factor;
922 :
923 : /* Determine number of components in output image */
924 0 : if (info->force_grayscale &&
925 0 : srcinfo->jpeg_color_space == JCS_YCbCr &&
926 0 : srcinfo->num_components == 3)
927 : /* We'll only process the first component */
928 0 : info->num_components = 1;
929 : else
930 : /* Process all the components */
931 0 : info->num_components = srcinfo->num_components;
932 :
933 : /* Compute output image dimensions and related values. */
934 : #if JPEG_LIB_VERSION >= 80
935 : jpeg_core_output_dimensions(srcinfo);
936 : #else
937 0 : srcinfo->output_width = srcinfo->image_width;
938 0 : srcinfo->output_height = srcinfo->image_height;
939 : #endif
940 :
941 : /* Return right away if -perfect is given and transformation is not perfect.
942 : */
943 0 : if (info->perfect) {
944 0 : if (info->num_components == 1) {
945 0 : if (!jtransform_perfect_transform(srcinfo->output_width,
946 : srcinfo->output_height,
947 : srcinfo->_min_DCT_h_scaled_size,
948 : srcinfo->_min_DCT_v_scaled_size,
949 : info->transform))
950 0 : return FALSE;
951 : } else {
952 0 : if (!jtransform_perfect_transform(srcinfo->output_width,
953 : srcinfo->output_height,
954 0 : srcinfo->max_h_samp_factor * srcinfo->_min_DCT_h_scaled_size,
955 0 : srcinfo->max_v_samp_factor * srcinfo->_min_DCT_v_scaled_size,
956 : info->transform))
957 0 : return FALSE;
958 : }
959 : }
960 :
961 : /* If there is only one output component, force the iMCU size to be 1;
962 : * else use the source iMCU size. (This allows us to do the right thing
963 : * when reducing color to grayscale, and also provides a handy way of
964 : * cleaning up "funny" grayscale images whose sampling factors are not 1x1.)
965 : */
966 0 : switch (info->transform) {
967 : case JXFORM_TRANSPOSE:
968 : case JXFORM_TRANSVERSE:
969 : case JXFORM_ROT_90:
970 : case JXFORM_ROT_270:
971 0 : info->output_width = srcinfo->output_height;
972 0 : info->output_height = srcinfo->output_width;
973 0 : if (info->num_components == 1) {
974 0 : info->iMCU_sample_width = srcinfo->_min_DCT_v_scaled_size;
975 0 : info->iMCU_sample_height = srcinfo->_min_DCT_h_scaled_size;
976 : } else {
977 0 : info->iMCU_sample_width =
978 0 : srcinfo->max_v_samp_factor * srcinfo->_min_DCT_v_scaled_size;
979 0 : info->iMCU_sample_height =
980 0 : srcinfo->max_h_samp_factor * srcinfo->_min_DCT_h_scaled_size;
981 : }
982 0 : break;
983 : default:
984 0 : info->output_width = srcinfo->output_width;
985 0 : info->output_height = srcinfo->output_height;
986 0 : if (info->num_components == 1) {
987 0 : info->iMCU_sample_width = srcinfo->_min_DCT_h_scaled_size;
988 0 : info->iMCU_sample_height = srcinfo->_min_DCT_v_scaled_size;
989 : } else {
990 0 : info->iMCU_sample_width =
991 0 : srcinfo->max_h_samp_factor * srcinfo->_min_DCT_h_scaled_size;
992 0 : info->iMCU_sample_height =
993 0 : srcinfo->max_v_samp_factor * srcinfo->_min_DCT_v_scaled_size;
994 : }
995 0 : break;
996 : }
997 :
998 : /* If cropping has been requested, compute the crop area's position and
999 : * dimensions, ensuring that its upper left corner falls at an iMCU boundary.
1000 : */
1001 0 : if (info->crop) {
1002 : /* Insert default values for unset crop parameters */
1003 0 : if (info->crop_xoffset_set == JCROP_UNSET)
1004 0 : info->crop_xoffset = 0; /* default to +0 */
1005 0 : if (info->crop_yoffset_set == JCROP_UNSET)
1006 0 : info->crop_yoffset = 0; /* default to +0 */
1007 0 : if (info->crop_xoffset >= info->output_width ||
1008 0 : info->crop_yoffset >= info->output_height)
1009 0 : ERREXIT(srcinfo, JERR_CONVERSION_NOTIMPL);
1010 0 : if (info->crop_width_set == JCROP_UNSET)
1011 0 : info->crop_width = info->output_width - info->crop_xoffset;
1012 0 : if (info->crop_height_set == JCROP_UNSET)
1013 0 : info->crop_height = info->output_height - info->crop_yoffset;
1014 : /* Ensure parameters are valid */
1015 0 : if (info->crop_width <= 0 || info->crop_width > info->output_width ||
1016 0 : info->crop_height <= 0 || info->crop_height > info->output_height ||
1017 0 : info->crop_xoffset > info->output_width - info->crop_width ||
1018 0 : info->crop_yoffset > info->output_height - info->crop_height)
1019 0 : ERREXIT(srcinfo, JERR_CONVERSION_NOTIMPL);
1020 : /* Convert negative crop offsets into regular offsets */
1021 0 : if (info->crop_xoffset_set == JCROP_NEG)
1022 0 : xoffset = info->output_width - info->crop_width - info->crop_xoffset;
1023 : else
1024 0 : xoffset = info->crop_xoffset;
1025 0 : if (info->crop_yoffset_set == JCROP_NEG)
1026 0 : yoffset = info->output_height - info->crop_height - info->crop_yoffset;
1027 : else
1028 0 : yoffset = info->crop_yoffset;
1029 : /* Now adjust so that upper left corner falls at an iMCU boundary */
1030 0 : if (info->crop_width_set == JCROP_FORCE)
1031 0 : info->output_width = info->crop_width;
1032 : else
1033 0 : info->output_width =
1034 0 : info->crop_width + (xoffset % info->iMCU_sample_width);
1035 0 : if (info->crop_height_set == JCROP_FORCE)
1036 0 : info->output_height = info->crop_height;
1037 : else
1038 0 : info->output_height =
1039 0 : info->crop_height + (yoffset % info->iMCU_sample_height);
1040 : /* Save x/y offsets measured in iMCUs */
1041 0 : info->x_crop_offset = xoffset / info->iMCU_sample_width;
1042 0 : info->y_crop_offset = yoffset / info->iMCU_sample_height;
1043 : } else {
1044 0 : info->x_crop_offset = 0;
1045 0 : info->y_crop_offset = 0;
1046 : }
1047 :
1048 : /* Figure out whether we need workspace arrays,
1049 : * and if so whether they are transposed relative to the source.
1050 : */
1051 0 : need_workspace = FALSE;
1052 0 : transpose_it = FALSE;
1053 0 : switch (info->transform) {
1054 : case JXFORM_NONE:
1055 0 : if (info->x_crop_offset != 0 || info->y_crop_offset != 0)
1056 0 : need_workspace = TRUE;
1057 : /* No workspace needed if neither cropping nor transforming */
1058 0 : break;
1059 : case JXFORM_FLIP_H:
1060 0 : if (info->trim)
1061 0 : trim_right_edge(info, srcinfo->output_width);
1062 0 : if (info->y_crop_offset != 0 || info->slow_hflip)
1063 0 : need_workspace = TRUE;
1064 : /* do_flip_h_no_crop doesn't need a workspace array */
1065 0 : break;
1066 : case JXFORM_FLIP_V:
1067 0 : if (info->trim)
1068 0 : trim_bottom_edge(info, srcinfo->output_height);
1069 : /* Need workspace arrays having same dimensions as source image. */
1070 0 : need_workspace = TRUE;
1071 0 : break;
1072 : case JXFORM_TRANSPOSE:
1073 : /* transpose does NOT have to trim anything */
1074 : /* Need workspace arrays having transposed dimensions. */
1075 0 : need_workspace = TRUE;
1076 0 : transpose_it = TRUE;
1077 0 : break;
1078 : case JXFORM_TRANSVERSE:
1079 0 : if (info->trim) {
1080 0 : trim_right_edge(info, srcinfo->output_height);
1081 0 : trim_bottom_edge(info, srcinfo->output_width);
1082 : }
1083 : /* Need workspace arrays having transposed dimensions. */
1084 0 : need_workspace = TRUE;
1085 0 : transpose_it = TRUE;
1086 0 : break;
1087 : case JXFORM_ROT_90:
1088 0 : if (info->trim)
1089 0 : trim_right_edge(info, srcinfo->output_height);
1090 : /* Need workspace arrays having transposed dimensions. */
1091 0 : need_workspace = TRUE;
1092 0 : transpose_it = TRUE;
1093 0 : break;
1094 : case JXFORM_ROT_180:
1095 0 : if (info->trim) {
1096 0 : trim_right_edge(info, srcinfo->output_width);
1097 0 : trim_bottom_edge(info, srcinfo->output_height);
1098 : }
1099 : /* Need workspace arrays having same dimensions as source image. */
1100 0 : need_workspace = TRUE;
1101 0 : break;
1102 : case JXFORM_ROT_270:
1103 0 : if (info->trim)
1104 0 : trim_bottom_edge(info, srcinfo->output_width);
1105 : /* Need workspace arrays having transposed dimensions. */
1106 0 : need_workspace = TRUE;
1107 0 : transpose_it = TRUE;
1108 0 : break;
1109 : }
1110 :
1111 : /* Allocate workspace if needed.
1112 : * Note that we allocate arrays padded out to the next iMCU boundary,
1113 : * so that transform routines need not worry about missing edge blocks.
1114 : */
1115 0 : if (need_workspace) {
1116 0 : coef_arrays = (jvirt_barray_ptr *)
1117 0 : (*srcinfo->mem->alloc_small) ((j_common_ptr) srcinfo, JPOOL_IMAGE,
1118 0 : SIZEOF(jvirt_barray_ptr) * info->num_components);
1119 0 : width_in_iMCUs = (JDIMENSION)
1120 0 : jdiv_round_up((long) info->output_width,
1121 0 : (long) info->iMCU_sample_width);
1122 0 : height_in_iMCUs = (JDIMENSION)
1123 0 : jdiv_round_up((long) info->output_height,
1124 0 : (long) info->iMCU_sample_height);
1125 0 : for (ci = 0; ci < info->num_components; ci++) {
1126 0 : compptr = srcinfo->comp_info + ci;
1127 0 : if (info->num_components == 1) {
1128 : /* we're going to force samp factors to 1x1 in this case */
1129 0 : h_samp_factor = v_samp_factor = 1;
1130 0 : } else if (transpose_it) {
1131 0 : h_samp_factor = compptr->v_samp_factor;
1132 0 : v_samp_factor = compptr->h_samp_factor;
1133 : } else {
1134 0 : h_samp_factor = compptr->h_samp_factor;
1135 0 : v_samp_factor = compptr->v_samp_factor;
1136 : }
1137 0 : width_in_blocks = width_in_iMCUs * h_samp_factor;
1138 0 : height_in_blocks = height_in_iMCUs * v_samp_factor;
1139 0 : coef_arrays[ci] = (*srcinfo->mem->request_virt_barray)
1140 0 : ((j_common_ptr) srcinfo, JPOOL_IMAGE, FALSE,
1141 : width_in_blocks, height_in_blocks, (JDIMENSION) v_samp_factor);
1142 : }
1143 0 : info->workspace_coef_arrays = coef_arrays;
1144 : } else
1145 0 : info->workspace_coef_arrays = NULL;
1146 :
1147 0 : return TRUE;
1148 : }
1149 :
1150 :
1151 : /* Transpose destination image parameters */
1152 :
1153 : LOCAL(void)
1154 0 : transpose_critical_parameters (j_compress_ptr dstinfo)
1155 : {
1156 : int tblno, i, j, ci, itemp;
1157 : jpeg_component_info *compptr;
1158 : JQUANT_TBL *qtblptr;
1159 : JDIMENSION jtemp;
1160 : UINT16 qtemp;
1161 :
1162 : /* Transpose image dimensions */
1163 0 : jtemp = dstinfo->image_width;
1164 0 : dstinfo->image_width = dstinfo->image_height;
1165 0 : dstinfo->image_height = jtemp;
1166 : #if JPEG_LIB_VERSION >= 70
1167 : itemp = dstinfo->min_DCT_h_scaled_size;
1168 : dstinfo->min_DCT_h_scaled_size = dstinfo->min_DCT_v_scaled_size;
1169 : dstinfo->min_DCT_v_scaled_size = itemp;
1170 : #endif
1171 :
1172 : /* Transpose sampling factors */
1173 0 : for (ci = 0; ci < dstinfo->num_components; ci++) {
1174 0 : compptr = dstinfo->comp_info + ci;
1175 0 : itemp = compptr->h_samp_factor;
1176 0 : compptr->h_samp_factor = compptr->v_samp_factor;
1177 0 : compptr->v_samp_factor = itemp;
1178 : }
1179 :
1180 : /* Transpose quantization tables */
1181 0 : for (tblno = 0; tblno < NUM_QUANT_TBLS; tblno++) {
1182 0 : qtblptr = dstinfo->quant_tbl_ptrs[tblno];
1183 0 : if (qtblptr != NULL) {
1184 0 : for (i = 0; i < DCTSIZE; i++) {
1185 0 : for (j = 0; j < i; j++) {
1186 0 : qtemp = qtblptr->quantval[i*DCTSIZE+j];
1187 0 : qtblptr->quantval[i*DCTSIZE+j] = qtblptr->quantval[j*DCTSIZE+i];
1188 0 : qtblptr->quantval[j*DCTSIZE+i] = qtemp;
1189 : }
1190 : }
1191 : }
1192 : }
1193 0 : }
1194 :
1195 :
1196 : /* Adjust Exif image parameters.
1197 : *
1198 : * We try to adjust the Tags ExifImageWidth and ExifImageHeight if possible.
1199 : */
1200 :
1201 : #if JPEG_LIB_VERSION >= 70
1202 : LOCAL(void)
1203 : adjust_exif_parameters (JOCTET FAR * data, unsigned int length,
1204 : JDIMENSION new_width, JDIMENSION new_height)
1205 : {
1206 : boolean is_motorola; /* Flag for byte order */
1207 : unsigned int number_of_tags, tagnum;
1208 : unsigned int firstoffset, offset;
1209 : JDIMENSION new_value;
1210 :
1211 : if (length < 12) return; /* Length of an IFD entry */
1212 :
1213 : /* Discover byte order */
1214 : if (GETJOCTET(data[0]) == 0x49 && GETJOCTET(data[1]) == 0x49)
1215 : is_motorola = FALSE;
1216 : else if (GETJOCTET(data[0]) == 0x4D && GETJOCTET(data[1]) == 0x4D)
1217 : is_motorola = TRUE;
1218 : else
1219 : return;
1220 :
1221 : /* Check Tag Mark */
1222 : if (is_motorola) {
1223 : if (GETJOCTET(data[2]) != 0) return;
1224 : if (GETJOCTET(data[3]) != 0x2A) return;
1225 : } else {
1226 : if (GETJOCTET(data[3]) != 0) return;
1227 : if (GETJOCTET(data[2]) != 0x2A) return;
1228 : }
1229 :
1230 : /* Get first IFD offset (offset to IFD0) */
1231 : if (is_motorola) {
1232 : if (GETJOCTET(data[4]) != 0) return;
1233 : if (GETJOCTET(data[5]) != 0) return;
1234 : firstoffset = GETJOCTET(data[6]);
1235 : firstoffset <<= 8;
1236 : firstoffset += GETJOCTET(data[7]);
1237 : } else {
1238 : if (GETJOCTET(data[7]) != 0) return;
1239 : if (GETJOCTET(data[6]) != 0) return;
1240 : firstoffset = GETJOCTET(data[5]);
1241 : firstoffset <<= 8;
1242 : firstoffset += GETJOCTET(data[4]);
1243 : }
1244 : if (firstoffset > length - 2) return; /* check end of data segment */
1245 :
1246 : /* Get the number of directory entries contained in this IFD */
1247 : if (is_motorola) {
1248 : number_of_tags = GETJOCTET(data[firstoffset]);
1249 : number_of_tags <<= 8;
1250 : number_of_tags += GETJOCTET(data[firstoffset+1]);
1251 : } else {
1252 : number_of_tags = GETJOCTET(data[firstoffset+1]);
1253 : number_of_tags <<= 8;
1254 : number_of_tags += GETJOCTET(data[firstoffset]);
1255 : }
1256 : if (number_of_tags == 0) return;
1257 : firstoffset += 2;
1258 :
1259 : /* Search for ExifSubIFD offset Tag in IFD0 */
1260 : for (;;) {
1261 : if (firstoffset > length - 12) return; /* check end of data segment */
1262 : /* Get Tag number */
1263 : if (is_motorola) {
1264 : tagnum = GETJOCTET(data[firstoffset]);
1265 : tagnum <<= 8;
1266 : tagnum += GETJOCTET(data[firstoffset+1]);
1267 : } else {
1268 : tagnum = GETJOCTET(data[firstoffset+1]);
1269 : tagnum <<= 8;
1270 : tagnum += GETJOCTET(data[firstoffset]);
1271 : }
1272 : if (tagnum == 0x8769) break; /* found ExifSubIFD offset Tag */
1273 : if (--number_of_tags == 0) return;
1274 : firstoffset += 12;
1275 : }
1276 :
1277 : /* Get the ExifSubIFD offset */
1278 : if (is_motorola) {
1279 : if (GETJOCTET(data[firstoffset+8]) != 0) return;
1280 : if (GETJOCTET(data[firstoffset+9]) != 0) return;
1281 : offset = GETJOCTET(data[firstoffset+10]);
1282 : offset <<= 8;
1283 : offset += GETJOCTET(data[firstoffset+11]);
1284 : } else {
1285 : if (GETJOCTET(data[firstoffset+11]) != 0) return;
1286 : if (GETJOCTET(data[firstoffset+10]) != 0) return;
1287 : offset = GETJOCTET(data[firstoffset+9]);
1288 : offset <<= 8;
1289 : offset += GETJOCTET(data[firstoffset+8]);
1290 : }
1291 : if (offset > length - 2) return; /* check end of data segment */
1292 :
1293 : /* Get the number of directory entries contained in this SubIFD */
1294 : if (is_motorola) {
1295 : number_of_tags = GETJOCTET(data[offset]);
1296 : number_of_tags <<= 8;
1297 : number_of_tags += GETJOCTET(data[offset+1]);
1298 : } else {
1299 : number_of_tags = GETJOCTET(data[offset+1]);
1300 : number_of_tags <<= 8;
1301 : number_of_tags += GETJOCTET(data[offset]);
1302 : }
1303 : if (number_of_tags < 2) return;
1304 : offset += 2;
1305 :
1306 : /* Search for ExifImageWidth and ExifImageHeight Tags in this SubIFD */
1307 : do {
1308 : if (offset > length - 12) return; /* check end of data segment */
1309 : /* Get Tag number */
1310 : if (is_motorola) {
1311 : tagnum = GETJOCTET(data[offset]);
1312 : tagnum <<= 8;
1313 : tagnum += GETJOCTET(data[offset+1]);
1314 : } else {
1315 : tagnum = GETJOCTET(data[offset+1]);
1316 : tagnum <<= 8;
1317 : tagnum += GETJOCTET(data[offset]);
1318 : }
1319 : if (tagnum == 0xA002 || tagnum == 0xA003) {
1320 : if (tagnum == 0xA002)
1321 : new_value = new_width; /* ExifImageWidth Tag */
1322 : else
1323 : new_value = new_height; /* ExifImageHeight Tag */
1324 : if (is_motorola) {
1325 : data[offset+2] = 0; /* Format = unsigned long (4 octets) */
1326 : data[offset+3] = 4;
1327 : data[offset+4] = 0; /* Number Of Components = 1 */
1328 : data[offset+5] = 0;
1329 : data[offset+6] = 0;
1330 : data[offset+7] = 1;
1331 : data[offset+8] = 0;
1332 : data[offset+9] = 0;
1333 : data[offset+10] = (JOCTET)((new_value >> 8) & 0xFF);
1334 : data[offset+11] = (JOCTET)(new_value & 0xFF);
1335 : } else {
1336 : data[offset+2] = 4; /* Format = unsigned long (4 octets) */
1337 : data[offset+3] = 0;
1338 : data[offset+4] = 1; /* Number Of Components = 1 */
1339 : data[offset+5] = 0;
1340 : data[offset+6] = 0;
1341 : data[offset+7] = 0;
1342 : data[offset+8] = (JOCTET)(new_value & 0xFF);
1343 : data[offset+9] = (JOCTET)((new_value >> 8) & 0xFF);
1344 : data[offset+10] = 0;
1345 : data[offset+11] = 0;
1346 : }
1347 : }
1348 : offset += 12;
1349 : } while (--number_of_tags);
1350 : }
1351 : #endif
1352 :
1353 :
1354 : /* Adjust output image parameters as needed.
1355 : *
1356 : * This must be called after jpeg_copy_critical_parameters()
1357 : * and before jpeg_write_coefficients().
1358 : *
1359 : * The return value is the set of virtual coefficient arrays to be written
1360 : * (either the ones allocated by jtransform_request_workspace, or the
1361 : * original source data arrays). The caller will need to pass this value
1362 : * to jpeg_write_coefficients().
1363 : */
1364 :
1365 : GLOBAL(jvirt_barray_ptr *)
1366 0 : jtransform_adjust_parameters (j_decompress_ptr srcinfo,
1367 : j_compress_ptr dstinfo,
1368 : jvirt_barray_ptr *src_coef_arrays,
1369 : jpeg_transform_info *info)
1370 : {
1371 : /* If force-to-grayscale is requested, adjust destination parameters */
1372 0 : if (info->force_grayscale) {
1373 : /* First, ensure we have YCbCr or grayscale data, and that the source's
1374 : * Y channel is full resolution. (No reasonable person would make Y
1375 : * be less than full resolution, so actually coping with that case
1376 : * isn't worth extra code space. But we check it to avoid crashing.)
1377 : */
1378 0 : if (((dstinfo->jpeg_color_space == JCS_YCbCr &&
1379 0 : dstinfo->num_components == 3) ||
1380 0 : (dstinfo->jpeg_color_space == JCS_GRAYSCALE &&
1381 0 : dstinfo->num_components == 1)) &&
1382 0 : srcinfo->comp_info[0].h_samp_factor == srcinfo->max_h_samp_factor &&
1383 0 : srcinfo->comp_info[0].v_samp_factor == srcinfo->max_v_samp_factor) {
1384 : /* We use jpeg_set_colorspace to make sure subsidiary settings get fixed
1385 : * properly. Among other things, it sets the target h_samp_factor &
1386 : * v_samp_factor to 1, which typically won't match the source.
1387 : * We have to preserve the source's quantization table number, however.
1388 : */
1389 0 : int sv_quant_tbl_no = dstinfo->comp_info[0].quant_tbl_no;
1390 0 : jpeg_set_colorspace(dstinfo, JCS_GRAYSCALE);
1391 0 : dstinfo->comp_info[0].quant_tbl_no = sv_quant_tbl_no;
1392 : } else {
1393 : /* Sorry, can't do it */
1394 0 : ERREXIT(dstinfo, JERR_CONVERSION_NOTIMPL);
1395 : }
1396 0 : } else if (info->num_components == 1) {
1397 : /* For a single-component source, we force the destination sampling factors
1398 : * to 1x1, with or without force_grayscale. This is useful because some
1399 : * decoders choke on grayscale images with other sampling factors.
1400 : */
1401 0 : dstinfo->comp_info[0].h_samp_factor = 1;
1402 0 : dstinfo->comp_info[0].v_samp_factor = 1;
1403 : }
1404 :
1405 : /* Correct the destination's image dimensions as necessary
1406 : * for rotate/flip, resize, and crop operations.
1407 : */
1408 : #if JPEG_LIB_VERSION >= 70
1409 : dstinfo->jpeg_width = info->output_width;
1410 : dstinfo->jpeg_height = info->output_height;
1411 : #endif
1412 :
1413 : /* Transpose destination image parameters */
1414 0 : switch (info->transform) {
1415 : case JXFORM_TRANSPOSE:
1416 : case JXFORM_TRANSVERSE:
1417 : case JXFORM_ROT_90:
1418 : case JXFORM_ROT_270:
1419 : #if JPEG_LIB_VERSION < 70
1420 0 : dstinfo->image_width = info->output_height;
1421 0 : dstinfo->image_height = info->output_width;
1422 : #endif
1423 0 : transpose_critical_parameters(dstinfo);
1424 0 : break;
1425 : default:
1426 : #if JPEG_LIB_VERSION < 70
1427 0 : dstinfo->image_width = info->output_width;
1428 0 : dstinfo->image_height = info->output_height;
1429 : #endif
1430 0 : break;
1431 : }
1432 :
1433 : /* Adjust Exif properties */
1434 0 : if (srcinfo->marker_list != NULL &&
1435 0 : srcinfo->marker_list->marker == JPEG_APP0+1 &&
1436 0 : srcinfo->marker_list->data_length >= 6 &&
1437 0 : GETJOCTET(srcinfo->marker_list->data[0]) == 0x45 &&
1438 0 : GETJOCTET(srcinfo->marker_list->data[1]) == 0x78 &&
1439 0 : GETJOCTET(srcinfo->marker_list->data[2]) == 0x69 &&
1440 0 : GETJOCTET(srcinfo->marker_list->data[3]) == 0x66 &&
1441 0 : GETJOCTET(srcinfo->marker_list->data[4]) == 0 &&
1442 0 : GETJOCTET(srcinfo->marker_list->data[5]) == 0) {
1443 : /* Suppress output of JFIF marker */
1444 0 : dstinfo->write_JFIF_header = FALSE;
1445 : #if JPEG_LIB_VERSION >= 70
1446 : /* Adjust Exif image parameters */
1447 : if (dstinfo->jpeg_width != srcinfo->image_width ||
1448 : dstinfo->jpeg_height != srcinfo->image_height)
1449 : /* Align data segment to start of TIFF structure for parsing */
1450 : adjust_exif_parameters(srcinfo->marker_list->data + 6,
1451 : srcinfo->marker_list->data_length - 6,
1452 : dstinfo->jpeg_width, dstinfo->jpeg_height);
1453 : #endif
1454 : }
1455 :
1456 : /* Return the appropriate output data set */
1457 0 : if (info->workspace_coef_arrays != NULL)
1458 0 : return info->workspace_coef_arrays;
1459 0 : return src_coef_arrays;
1460 : }
1461 :
1462 :
1463 : /* Execute the actual transformation, if any.
1464 : *
1465 : * This must be called *after* jpeg_write_coefficients, because it depends
1466 : * on jpeg_write_coefficients to have computed subsidiary values such as
1467 : * the per-component width and height fields in the destination object.
1468 : *
1469 : * Note that some transformations will modify the source data arrays!
1470 : */
1471 :
1472 : GLOBAL(void)
1473 0 : jtransform_execute_transform (j_decompress_ptr srcinfo,
1474 : j_compress_ptr dstinfo,
1475 : jvirt_barray_ptr *src_coef_arrays,
1476 : jpeg_transform_info *info)
1477 : {
1478 0 : jvirt_barray_ptr *dst_coef_arrays = info->workspace_coef_arrays;
1479 :
1480 : /* Note: conditions tested here should match those in switch statement
1481 : * in jtransform_request_workspace()
1482 : */
1483 0 : switch (info->transform) {
1484 : case JXFORM_NONE:
1485 0 : if (info->x_crop_offset != 0 || info->y_crop_offset != 0)
1486 0 : do_crop(srcinfo, dstinfo, info->x_crop_offset, info->y_crop_offset,
1487 : src_coef_arrays, dst_coef_arrays);
1488 0 : break;
1489 : case JXFORM_FLIP_H:
1490 0 : if (info->y_crop_offset != 0 || info->slow_hflip)
1491 0 : do_flip_h(srcinfo, dstinfo, info->x_crop_offset, info->y_crop_offset,
1492 : src_coef_arrays, dst_coef_arrays);
1493 : else
1494 0 : do_flip_h_no_crop(srcinfo, dstinfo, info->x_crop_offset,
1495 : src_coef_arrays);
1496 0 : break;
1497 : case JXFORM_FLIP_V:
1498 0 : do_flip_v(srcinfo, dstinfo, info->x_crop_offset, info->y_crop_offset,
1499 : src_coef_arrays, dst_coef_arrays);
1500 0 : break;
1501 : case JXFORM_TRANSPOSE:
1502 0 : do_transpose(srcinfo, dstinfo, info->x_crop_offset, info->y_crop_offset,
1503 : src_coef_arrays, dst_coef_arrays);
1504 0 : break;
1505 : case JXFORM_TRANSVERSE:
1506 0 : do_transverse(srcinfo, dstinfo, info->x_crop_offset, info->y_crop_offset,
1507 : src_coef_arrays, dst_coef_arrays);
1508 0 : break;
1509 : case JXFORM_ROT_90:
1510 0 : do_rot_90(srcinfo, dstinfo, info->x_crop_offset, info->y_crop_offset,
1511 : src_coef_arrays, dst_coef_arrays);
1512 0 : break;
1513 : case JXFORM_ROT_180:
1514 0 : do_rot_180(srcinfo, dstinfo, info->x_crop_offset, info->y_crop_offset,
1515 : src_coef_arrays, dst_coef_arrays);
1516 0 : break;
1517 : case JXFORM_ROT_270:
1518 0 : do_rot_270(srcinfo, dstinfo, info->x_crop_offset, info->y_crop_offset,
1519 : src_coef_arrays, dst_coef_arrays);
1520 0 : break;
1521 : }
1522 0 : }
1523 :
1524 : /* jtransform_perfect_transform
1525 : *
1526 : * Determine whether lossless transformation is perfectly
1527 : * possible for a specified image and transformation.
1528 : *
1529 : * Inputs:
1530 : * image_width, image_height: source image dimensions.
1531 : * MCU_width, MCU_height: pixel dimensions of MCU.
1532 : * transform: transformation identifier.
1533 : * Parameter sources from initialized jpeg_struct
1534 : * (after reading source header):
1535 : * image_width = cinfo.image_width
1536 : * image_height = cinfo.image_height
1537 : * MCU_width = cinfo.max_h_samp_factor * cinfo.block_size
1538 : * MCU_height = cinfo.max_v_samp_factor * cinfo.block_size
1539 : * Result:
1540 : * TRUE = perfect transformation possible
1541 : * FALSE = perfect transformation not possible
1542 : * (may use custom action then)
1543 : */
1544 :
1545 : GLOBAL(boolean)
1546 0 : jtransform_perfect_transform(JDIMENSION image_width, JDIMENSION image_height,
1547 : int MCU_width, int MCU_height,
1548 : JXFORM_CODE transform)
1549 : {
1550 0 : boolean result = TRUE; /* initialize TRUE */
1551 :
1552 0 : switch (transform) {
1553 : case JXFORM_FLIP_H:
1554 : case JXFORM_ROT_270:
1555 0 : if (image_width % (JDIMENSION) MCU_width)
1556 0 : result = FALSE;
1557 0 : break;
1558 : case JXFORM_FLIP_V:
1559 : case JXFORM_ROT_90:
1560 0 : if (image_height % (JDIMENSION) MCU_height)
1561 0 : result = FALSE;
1562 0 : break;
1563 : case JXFORM_TRANSVERSE:
1564 : case JXFORM_ROT_180:
1565 0 : if (image_width % (JDIMENSION) MCU_width)
1566 0 : result = FALSE;
1567 0 : if (image_height % (JDIMENSION) MCU_height)
1568 0 : result = FALSE;
1569 0 : break;
1570 : default:
1571 0 : break;
1572 : }
1573 :
1574 0 : return result;
1575 : }
1576 :
1577 : #endif /* TRANSFORMS_SUPPORTED */
1578 :
1579 :
1580 : /* Setup decompression object to save desired markers in memory.
1581 : * This must be called before jpeg_read_header() to have the desired effect.
1582 : */
1583 :
1584 : GLOBAL(void)
1585 0 : jcopy_markers_setup (j_decompress_ptr srcinfo, JCOPY_OPTION option)
1586 : {
1587 : #ifdef SAVE_MARKERS_SUPPORTED
1588 : int m;
1589 :
1590 : /* Save comments except under NONE option */
1591 : if (option != JCOPYOPT_NONE) {
1592 : jpeg_save_markers(srcinfo, JPEG_COM, 0xFFFF);
1593 : }
1594 : /* Save all types of APPn markers iff ALL option */
1595 : if (option == JCOPYOPT_ALL) {
1596 : for (m = 0; m < 16; m++)
1597 : jpeg_save_markers(srcinfo, JPEG_APP0 + m, 0xFFFF);
1598 : }
1599 : #else
1600 : (void) srcinfo; (void) option;
1601 : #endif /* SAVE_MARKERS_SUPPORTED */
1602 0 : }
1603 :
1604 : /* Copy markers saved in the given source object to the destination object.
1605 : * This should be called just after jpeg_start_compress() or
1606 : * jpeg_write_coefficients().
1607 : * Note that those routines will have written the SOI, and also the
1608 : * JFIF APP0 or Adobe APP14 markers if selected.
1609 : */
1610 :
1611 : GLOBAL(void)
1612 0 : jcopy_markers_execute (j_decompress_ptr srcinfo, j_compress_ptr dstinfo,
1613 : JCOPY_OPTION option)
1614 : {
1615 : jpeg_saved_marker_ptr marker;
1616 :
1617 : /* In the current implementation, we don't actually need to examine the
1618 : * option flag here; we just copy everything that got saved.
1619 : * But to avoid confusion, we do not output JFIF and Adobe APP14 markers
1620 : * if the encoder library already wrote one.
1621 : */
1622 : if (option) {}
1623 :
1624 0 : for (marker = srcinfo->marker_list; marker != NULL; marker = marker->next) {
1625 0 : if (dstinfo->write_JFIF_header &&
1626 0 : marker->marker == JPEG_APP0 &&
1627 0 : marker->data_length >= 5 &&
1628 0 : GETJOCTET(marker->data[0]) == 0x4A &&
1629 0 : GETJOCTET(marker->data[1]) == 0x46 &&
1630 0 : GETJOCTET(marker->data[2]) == 0x49 &&
1631 0 : GETJOCTET(marker->data[3]) == 0x46 &&
1632 0 : GETJOCTET(marker->data[4]) == 0)
1633 0 : continue; /* reject duplicate JFIF */
1634 0 : if (dstinfo->write_Adobe_marker &&
1635 0 : marker->marker == JPEG_APP0+14 &&
1636 0 : marker->data_length >= 5 &&
1637 0 : GETJOCTET(marker->data[0]) == 0x41 &&
1638 0 : GETJOCTET(marker->data[1]) == 0x64 &&
1639 0 : GETJOCTET(marker->data[2]) == 0x6F &&
1640 0 : GETJOCTET(marker->data[3]) == 0x62 &&
1641 0 : GETJOCTET(marker->data[4]) == 0x65)
1642 0 : continue; /* reject duplicate Adobe */
1643 : #ifdef NEED_FAR_POINTERS
1644 : /* We could use jpeg_write_marker if the data weren't FAR... */
1645 : {
1646 : unsigned int i;
1647 : jpeg_write_m_header(dstinfo, marker->marker, marker->data_length);
1648 : for (i = 0; i < marker->data_length; i++)
1649 : jpeg_write_m_byte(dstinfo, marker->data[i]);
1650 : }
1651 : #else
1652 0 : jpeg_write_marker(dstinfo, marker->marker,
1653 0 : marker->data, marker->data_length);
1654 : #endif
1655 : }
1656 0 : }
|
