| File: | root/firefox-clang/gfx/cairo/cairo/src/cairo-surface-snapshot.c |
| Warning: | line 215, column 5 Value stored to 'status' is never read |
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| 1 | /* cairo - a vector graphics library with display and print output |
| 2 | * |
| 3 | * Copyright © 2002 University of Southern California |
| 4 | * Copyright © 2005 Red Hat, Inc. |
| 5 | * Copyright © 2009 Intel Corporation |
| 6 | * |
| 7 | * This library is free software; you can redistribute it and/or |
| 8 | * modify it either under the terms of the GNU Lesser General Public |
| 9 | * License version 2.1 as published by the Free Software Foundation |
| 10 | * (the "LGPL") or, at your option, under the terms of the Mozilla |
| 11 | * Public License Version 1.1 (the "MPL"). If you do not alter this |
| 12 | * notice, a recipient may use your version of this file under either |
| 13 | * the MPL or the LGPL. |
| 14 | * |
| 15 | * You should have received a copy of the LGPL along with this library |
| 16 | * in the file COPYING-LGPL-2.1; if not, write to the Free Software |
| 17 | * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA |
| 18 | * You should have received a copy of the MPL along with this library |
| 19 | * in the file COPYING-MPL-1.1 |
| 20 | * |
| 21 | * The contents of this file are subject to the Mozilla Public License |
| 22 | * Version 1.1 (the "License"); you may not use this file except in |
| 23 | * compliance with the License. You may obtain a copy of the License at |
| 24 | * http://www.mozilla.org/MPL/ |
| 25 | * |
| 26 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY |
| 27 | * OF ANY KIND, either express or implied. See the LGPL or the MPL for |
| 28 | * the specific language governing rights and limitations. |
| 29 | * |
| 30 | * The Original Code is the cairo graphics library. |
| 31 | * |
| 32 | * The Initial Developer of the Original Code is University of Southern |
| 33 | * California. |
| 34 | * |
| 35 | * Contributor(s): |
| 36 | * Carl D. Worth <cworth@cworth.org> |
| 37 | * Chris Wilson <chris@chris-wilson.co.uk> |
| 38 | */ |
| 39 | |
| 40 | #include "cairoint.h" |
| 41 | |
| 42 | #include "cairo-error-private.h" |
| 43 | #include "cairo-image-surface-private.h" |
| 44 | #include "cairo-surface-snapshot-inline.h" |
| 45 | |
| 46 | static cairo_status_t |
| 47 | _cairo_surface_snapshot_finish (void *abstract_surface) |
| 48 | { |
| 49 | cairo_surface_snapshot_t *surface = abstract_surface; |
| 50 | cairo_status_t status = CAIRO_STATUS_SUCCESS; |
| 51 | |
| 52 | TRACE ((stderr, "%s\n", __FUNCTION__)); |
| 53 | |
| 54 | if (surface->clone != NULL((void*)0)) { |
| 55 | cairo_surface_finish_moz_cairo_surface_finish (surface->clone); |
| 56 | status = surface->clone->status; |
| 57 | |
| 58 | cairo_surface_destroy_moz_cairo_surface_destroy (surface->clone); |
| 59 | } |
| 60 | |
| 61 | CAIRO_MUTEX_FINI (surface->mutex)pthread_mutex_destroy (&(surface->mutex)); |
| 62 | |
| 63 | return status; |
| 64 | } |
| 65 | |
| 66 | static cairo_status_t |
| 67 | _cairo_surface_snapshot_flush (void *abstract_surface, unsigned flags) |
| 68 | { |
| 69 | cairo_surface_snapshot_t *surface = abstract_surface; |
| 70 | cairo_surface_t *target; |
| 71 | cairo_status_t status; |
| 72 | |
| 73 | target = _cairo_surface_snapshot_get_target (&surface->base); |
| 74 | status = target->status; |
| 75 | if (status == CAIRO_STATUS_SUCCESS) |
| 76 | status = _cairo_surface_flush (target, flags); |
| 77 | cairo_surface_destroy_moz_cairo_surface_destroy (target); |
| 78 | |
| 79 | return status; |
| 80 | } |
| 81 | |
| 82 | static cairo_surface_t * |
| 83 | _cairo_surface_snapshot_source (void *abstract_surface, |
| 84 | cairo_rectangle_int_t *extents) |
| 85 | { |
| 86 | cairo_surface_snapshot_t *surface = abstract_surface; |
| 87 | return _cairo_surface_get_source (surface->target, extents); /* XXX racy */ |
| 88 | } |
| 89 | |
| 90 | struct snapshot_extra { |
| 91 | cairo_surface_t *target; |
| 92 | void *extra; |
| 93 | }; |
| 94 | |
| 95 | static cairo_status_t |
| 96 | _cairo_surface_snapshot_acquire_source_image (void *abstract_surface, |
| 97 | cairo_image_surface_t **image_out, |
| 98 | void **extra_out) |
| 99 | { |
| 100 | cairo_surface_snapshot_t *surface = abstract_surface; |
| 101 | struct snapshot_extra *extra; |
| 102 | cairo_status_t status; |
| 103 | |
| 104 | extra = _cairo_malloc (sizeof (*extra))((sizeof (*extra)) != 0 ? malloc(sizeof (*extra)) : ((void*)0 )); |
| 105 | if (unlikely (extra == NULL)(__builtin_expect (!!(extra == ((void*)0)), 0))) { |
| 106 | *extra_out = NULL((void*)0); |
| 107 | return _cairo_error (CAIRO_STATUS_NO_MEMORY); |
| 108 | } |
| 109 | |
| 110 | extra->target = _cairo_surface_snapshot_get_target (&surface->base); |
| 111 | status = _cairo_surface_acquire_source_image (extra->target, image_out, &extra->extra); |
| 112 | if (unlikely (status)(__builtin_expect (!!(status), 0))) { |
| 113 | cairo_surface_destroy_moz_cairo_surface_destroy (extra->target); |
| 114 | free (extra); |
| 115 | extra = NULL((void*)0); |
| 116 | } |
| 117 | |
| 118 | *extra_out = extra; |
| 119 | return status; |
| 120 | } |
| 121 | |
| 122 | static void |
| 123 | _cairo_surface_snapshot_release_source_image (void *abstract_surface, |
| 124 | cairo_image_surface_t *image, |
| 125 | void *_extra) |
| 126 | { |
| 127 | struct snapshot_extra *extra = _extra; |
| 128 | |
| 129 | _cairo_surface_release_source_image (extra->target, image, extra->extra); |
| 130 | cairo_surface_destroy_moz_cairo_surface_destroy (extra->target); |
| 131 | free (extra); |
| 132 | } |
| 133 | |
| 134 | static cairo_bool_t |
| 135 | _cairo_surface_snapshot_get_extents (void *abstract_surface, |
| 136 | cairo_rectangle_int_t *extents) |
| 137 | { |
| 138 | cairo_surface_snapshot_t *surface = abstract_surface; |
| 139 | cairo_surface_t *target; |
| 140 | cairo_bool_t bounded; |
| 141 | |
| 142 | target = _cairo_surface_snapshot_get_target (&surface->base); |
| 143 | bounded = _cairo_surface_get_extents (target, extents); |
| 144 | cairo_surface_destroy_moz_cairo_surface_destroy (target); |
| 145 | |
| 146 | return bounded; |
| 147 | } |
| 148 | |
| 149 | static const cairo_surface_backend_t _cairo_surface_snapshot_backend = { |
| 150 | CAIRO_INTERNAL_SURFACE_TYPE_SNAPSHOT, |
| 151 | _cairo_surface_snapshot_finish, |
| 152 | NULL((void*)0), |
| 153 | |
| 154 | NULL((void*)0), /* create similar */ |
| 155 | NULL((void*)0), /* create similar image */ |
| 156 | NULL((void*)0), /* map to image */ |
| 157 | NULL((void*)0), /* unmap image */ |
| 158 | |
| 159 | _cairo_surface_snapshot_source, |
| 160 | _cairo_surface_snapshot_acquire_source_image, |
| 161 | _cairo_surface_snapshot_release_source_image, |
| 162 | NULL((void*)0), /* snapshot */ |
| 163 | |
| 164 | NULL((void*)0), /* copy_page */ |
| 165 | NULL((void*)0), /* show_page */ |
| 166 | |
| 167 | _cairo_surface_snapshot_get_extents, |
| 168 | NULL((void*)0), /* get-font-options */ |
| 169 | |
| 170 | _cairo_surface_snapshot_flush, |
| 171 | }; |
| 172 | |
| 173 | static void |
| 174 | _cairo_surface_snapshot_copy_on_write (cairo_surface_t *surface) |
| 175 | { |
| 176 | cairo_surface_snapshot_t *snapshot = (cairo_surface_snapshot_t *) surface; |
| 177 | cairo_image_surface_t *image; |
| 178 | cairo_surface_t *clone; |
| 179 | void *extra; |
| 180 | cairo_status_t status; |
| 181 | |
| 182 | TRACE ((stderr, "%s: target=%d\n", |
| 183 | __FUNCTION__, snapshot->target->unique_id)); |
| 184 | |
| 185 | /* We need to make an image copy of the original surface since the |
| 186 | * snapshot may exceed the lifetime of the original device, i.e. |
| 187 | * when we later need to use the snapshot the data may have already |
| 188 | * been lost. |
| 189 | */ |
| 190 | |
| 191 | CAIRO_MUTEX_LOCK (snapshot->mutex)pthread_mutex_lock (&(snapshot->mutex)); |
| 192 | |
| 193 | if (snapshot->target->backend->snapshot != NULL((void*)0)) { |
| 194 | clone = snapshot->target->backend->snapshot (snapshot->target); |
| 195 | if (clone != NULL((void*)0)) { |
| 196 | assert (clone->status || ! _cairo_surface_is_snapshot (clone))((void) sizeof ((clone->status || ! _cairo_surface_is_snapshot (clone)) ? 1 : 0), __extension__ ({ if (clone->status || ! _cairo_surface_is_snapshot (clone)) ; else __assert_fail ("clone->status || ! _cairo_surface_is_snapshot (clone)" , "/root/firefox-clang/gfx/cairo/cairo/src/cairo-surface-snapshot.c" , 196, __extension__ __PRETTY_FUNCTION__); })); |
| 197 | goto done; |
| 198 | } |
| 199 | } |
| 200 | |
| 201 | /* XXX copy to a similar surface, leave acquisition till later? |
| 202 | * We should probably leave such decisions to the backend in case we |
| 203 | * rely upon devices/connections like Xlib. |
| 204 | */ |
| 205 | status = _cairo_surface_acquire_source_image (snapshot->target, &image, &extra); |
| 206 | if (unlikely (status)(__builtin_expect (!!(status), 0))) { |
| 207 | snapshot->target = _cairo_surface_create_in_error (status); |
| 208 | status = _cairo_surface_set_error (surface, status); |
| 209 | goto unlock; |
| 210 | } |
| 211 | clone = image->base.backend->snapshot (&image->base); |
| 212 | _cairo_surface_release_source_image (snapshot->target, image, extra); |
| 213 | |
| 214 | done: |
| 215 | status = _cairo_surface_set_error (surface, clone->status); |
Value stored to 'status' is never read | |
| 216 | snapshot->target = snapshot->clone = clone; |
| 217 | snapshot->base.type = clone->type; |
| 218 | unlock: |
| 219 | CAIRO_MUTEX_UNLOCK (snapshot->mutex)pthread_mutex_unlock (&(snapshot->mutex)); |
| 220 | } |
| 221 | |
| 222 | /** |
| 223 | * _cairo_surface_snapshot: |
| 224 | * @surface: a #cairo_surface_t |
| 225 | * |
| 226 | * Make an immutable reference to @surface. It is an error to call a |
| 227 | * surface-modifying function on the result of this function. The |
| 228 | * resulting 'snapshot' is a lazily copied-on-write surface i.e. it |
| 229 | * remains a reference to the original surface until that surface is |
| 230 | * written to again, at which time a copy is made of the original surface |
| 231 | * and the snapshot then points to that instead. Multiple snapshots of the |
| 232 | * same unmodified surface point to the same copy. |
| 233 | * |
| 234 | * The caller owns the return value and should call |
| 235 | * cairo_surface_destroy() when finished with it. This function will not |
| 236 | * return %NULL, but will return a nil surface instead. |
| 237 | * |
| 238 | * Return value: The snapshot surface. Note that the return surface |
| 239 | * may not necessarily be of the same type as @surface. |
| 240 | **/ |
| 241 | cairo_surface_t * |
| 242 | _cairo_surface_snapshot (cairo_surface_t *surface) |
| 243 | { |
| 244 | cairo_surface_snapshot_t *snapshot; |
| 245 | cairo_status_t status; |
| 246 | |
| 247 | TRACE ((stderr, "%s: target=%d\n", __FUNCTION__, surface->unique_id)); |
| 248 | |
| 249 | if (unlikely (surface->status)(__builtin_expect (!!(surface->status), 0))) |
| 250 | return _cairo_surface_create_in_error (surface->status); |
| 251 | |
| 252 | if (unlikely (surface->finished)(__builtin_expect (!!(surface->finished), 0))) |
| 253 | return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_SURFACE_FINISHED)); |
| 254 | |
| 255 | if (surface->snapshot_of != NULL((void*)0)) |
| 256 | return cairo_surface_reference_moz_cairo_surface_reference (surface); |
| 257 | |
| 258 | if (_cairo_surface_is_snapshot (surface)) |
| 259 | return cairo_surface_reference_moz_cairo_surface_reference (surface); |
| 260 | |
| 261 | snapshot = (cairo_surface_snapshot_t *) |
| 262 | _cairo_surface_has_snapshot (surface, &_cairo_surface_snapshot_backend); |
| 263 | if (snapshot != NULL((void*)0)) |
| 264 | return cairo_surface_reference_moz_cairo_surface_reference (&snapshot->base); |
| 265 | |
| 266 | snapshot = _cairo_malloc (sizeof (cairo_surface_snapshot_t))((sizeof (cairo_surface_snapshot_t)) != 0 ? malloc(sizeof (cairo_surface_snapshot_t )) : ((void*)0)); |
| 267 | if (unlikely (snapshot == NULL)(__builtin_expect (!!(snapshot == ((void*)0)), 0))) |
| 268 | return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_SURFACE_FINISHED)); |
| 269 | |
| 270 | _cairo_surface_init (&snapshot->base, |
| 271 | &_cairo_surface_snapshot_backend, |
| 272 | NULL((void*)0), /* device */ |
| 273 | surface->content, |
| 274 | surface->is_vector); |
| 275 | snapshot->base.type = surface->type; |
| 276 | |
| 277 | CAIRO_MUTEX_INIT (snapshot->mutex)do { cairo_mutex_t _tmp_mutex = { { 0, 0, 0, 0, PTHREAD_MUTEX_TIMED_NP , 0, 0, { 0, 0 } } }; memcpy (&(snapshot->mutex), & _tmp_mutex, sizeof (_tmp_mutex)); } while (0); |
| 278 | snapshot->target = surface; |
| 279 | snapshot->clone = NULL((void*)0); |
| 280 | |
| 281 | status = _cairo_surface_copy_mime_data (&snapshot->base, surface); |
| 282 | if (unlikely (status)(__builtin_expect (!!(status), 0))) { |
| 283 | cairo_surface_destroy_moz_cairo_surface_destroy (&snapshot->base); |
| 284 | return _cairo_surface_create_in_error (status); |
| 285 | } |
| 286 | |
| 287 | snapshot->base.device_transform = surface->device_transform; |
| 288 | snapshot->base.device_transform_inverse = surface->device_transform_inverse; |
| 289 | |
| 290 | _cairo_surface_attach_snapshot (surface, |
| 291 | &snapshot->base, |
| 292 | _cairo_surface_snapshot_copy_on_write); |
| 293 | |
| 294 | return &snapshot->base; |
| 295 | } |