| File: | content/handlers/image/rsvg246.c |
| Warning: | line 133, column 2 Value stored to 'renderres' is never read |
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| 1 | /* |
| 2 | * Copyright 2022 Vincent Sanders <vince@netsurf-browser.org> |
| 3 | * |
| 4 | * This file is part of NetSurf, http://www.netsurf-browser.org/ |
| 5 | * |
| 6 | * NetSurf is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; version 2 of the License. |
| 9 | * |
| 10 | * NetSurf is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 17 | */ |
| 18 | |
| 19 | /** |
| 20 | * \file |
| 21 | * implementation of content handler for image/svg using librsvg 2.46 API. |
| 22 | * |
| 23 | * SVG files are rendered to a NetSurf bitmap by creating a Cairo rendering |
| 24 | * surface (content_rsvg_data.cs) over the bitmap's data, creating a Cairo |
| 25 | * drawing context using that surface, and then passing that drawing context |
| 26 | * to librsvg which then uses Cairo calls to plot the graphic to the bitmap. |
| 27 | * We store this in content->bitmap, and then use the usual bitmap plotter |
| 28 | * function to render it for redraw requests. |
| 29 | */ |
| 30 | |
| 31 | #include <stdlib.h> |
| 32 | #include <stdbool.h> |
| 33 | #include <assert.h> |
| 34 | #include <string.h> |
| 35 | #include <sys/types.h> |
| 36 | |
| 37 | #include <librsvg/rsvg.h> |
| 38 | |
| 39 | #include <nsutils/endian.h> |
| 40 | |
| 41 | #include "utils/log.h" |
| 42 | #include "utils/utils.h" |
| 43 | #include "utils/messages.h" |
| 44 | #include "netsurf/plotters.h" |
| 45 | #include "netsurf/bitmap.h" |
| 46 | #include "netsurf/content.h" |
| 47 | #include "content/llcache.h" |
| 48 | #include "content/content_protected.h" |
| 49 | #include "content/content_factory.h" |
| 50 | #include "desktop/gui_internal.h" |
| 51 | #include "desktop/bitmap.h" |
| 52 | |
| 53 | #include "image/image_cache.h" |
| 54 | |
| 55 | #include "image/rsvg.h" |
| 56 | |
| 57 | |
| 58 | typedef struct rsvg_content { |
| 59 | struct content base; |
| 60 | |
| 61 | RsvgHandle *rsvgh; /**< Context handle for RSVG renderer */ |
| 62 | } rsvg_content; |
| 63 | |
| 64 | |
| 65 | static nserror |
| 66 | rsvg_create(const content_handler *handler, |
| 67 | lwc_string *imime_type, |
| 68 | const struct http_parameter *params, |
| 69 | llcache_handle *llcache, |
| 70 | const char *fallback_charset, |
| 71 | bool_Bool quirks, |
| 72 | struct content **c) |
| 73 | { |
| 74 | rsvg_content *svg; |
| 75 | nserror error; |
| 76 | |
| 77 | svg = calloc(1, sizeof(rsvg_content)); |
| 78 | if (svg == NULL((void*)0)) |
| 79 | return NSERROR_NOMEM; |
| 80 | |
| 81 | error = content__init(&svg->base, handler, imime_type, params, |
| 82 | llcache, fallback_charset, quirks); |
| 83 | if (error != NSERROR_OK) { |
| 84 | free(svg); |
| 85 | return error; |
| 86 | } |
| 87 | |
| 88 | *c = (struct content *)svg; |
| 89 | |
| 90 | return NSERROR_OK; |
| 91 | } |
| 92 | |
| 93 | |
| 94 | /** |
| 95 | * create a bitmap from jpeg content for the image cache. |
| 96 | */ |
| 97 | static struct bitmap * |
| 98 | rsvg_cache_convert(struct content *c) |
| 99 | { |
| 100 | rsvg_content *svgc = (rsvg_content *)c; |
| 101 | struct bitmap *bitmap; |
| 102 | cairo_surface_t *cs; |
| 103 | cairo_t *cr; |
| 104 | RsvgRectangle viewport; |
| 105 | gboolean renderres; |
| 106 | |
| 107 | if ((bitmap = guit->bitmap->create(c->width, c->height, BITMAP_NONE)) == NULL((void*)0)) { |
| 108 | NSLOG(netsurf, INFO, "Failed to create bitmap for rsvg render.")do { if (NSLOG_LEVEL_INFO >= NSLOG_LEVEL_VERBOSE) { static nslog_entry_context_t _nslog_ctx = { &__nslog_category_netsurf , NSLOG_LEVEL_INFO, "content/handlers/image/rsvg246.c", sizeof ("content/handlers/image/rsvg246.c") - 1, __PRETTY_FUNCTION__ , sizeof(__PRETTY_FUNCTION__) - 1, 108, }; nslog__log(&_nslog_ctx , "Failed to create bitmap for rsvg render."); } } while(0); |
| 109 | return NULL((void*)0); |
| 110 | } |
| 111 | |
| 112 | if ((cs = cairo_image_surface_create_for_data( |
| 113 | (unsigned char *)guit->bitmap->get_buffer(bitmap), |
| 114 | CAIRO_FORMAT_ARGB32, |
| 115 | c->width, c->height, |
| 116 | guit->bitmap->get_rowstride(bitmap))) == NULL((void*)0)) { |
| 117 | NSLOG(netsurf, INFO, "Failed to create Cairo image surface for rsvg render.")do { if (NSLOG_LEVEL_INFO >= NSLOG_LEVEL_VERBOSE) { static nslog_entry_context_t _nslog_ctx = { &__nslog_category_netsurf , NSLOG_LEVEL_INFO, "content/handlers/image/rsvg246.c", sizeof ("content/handlers/image/rsvg246.c") - 1, __PRETTY_FUNCTION__ , sizeof(__PRETTY_FUNCTION__) - 1, 117, }; nslog__log(&_nslog_ctx , "Failed to create Cairo image surface for rsvg render."); } } while(0); |
| 118 | guit->bitmap->destroy(bitmap); |
| 119 | return NULL((void*)0); |
| 120 | } |
| 121 | if ((cr = cairo_create(cs)) == NULL((void*)0)) { |
| 122 | NSLOG(netsurf, INFO,do { if (NSLOG_LEVEL_INFO >= NSLOG_LEVEL_VERBOSE) { static nslog_entry_context_t _nslog_ctx = { &__nslog_category_netsurf , NSLOG_LEVEL_INFO, "content/handlers/image/rsvg246.c", sizeof ("content/handlers/image/rsvg246.c") - 1, __PRETTY_FUNCTION__ , sizeof(__PRETTY_FUNCTION__) - 1, 123, }; nslog__log(&_nslog_ctx , "Failed to create Cairo drawing context for rsvg render."); } } while(0) |
| 123 | "Failed to create Cairo drawing context for rsvg render.")do { if (NSLOG_LEVEL_INFO >= NSLOG_LEVEL_VERBOSE) { static nslog_entry_context_t _nslog_ctx = { &__nslog_category_netsurf , NSLOG_LEVEL_INFO, "content/handlers/image/rsvg246.c", sizeof ("content/handlers/image/rsvg246.c") - 1, __PRETTY_FUNCTION__ , sizeof(__PRETTY_FUNCTION__) - 1, 123, }; nslog__log(&_nslog_ctx , "Failed to create Cairo drawing context for rsvg render."); } } while(0); |
| 124 | cairo_surface_destroy(cs); |
| 125 | guit->bitmap->destroy(bitmap); |
| 126 | return NULL((void*)0); |
| 127 | } |
| 128 | |
| 129 | viewport.x = 0; |
| 130 | viewport.y = 0; |
| 131 | viewport.width = c->width; |
| 132 | viewport.height = c->height; |
| 133 | renderres = rsvg_handle_render_document(svgc->rsvgh, cr, &viewport, NULL((void*)0)); |
Value stored to 'renderres' is never read | |
| 134 | NSLOG(netsurf, DEBUG, "rsvg render:%d, width:%d, height %d", renderres, c->width, c->height)do { if (NSLOG_LEVEL_DEBUG >= NSLOG_LEVEL_VERBOSE) { static nslog_entry_context_t _nslog_ctx = { &__nslog_category_netsurf , NSLOG_LEVEL_DEBUG, "content/handlers/image/rsvg246.c", sizeof ("content/handlers/image/rsvg246.c") - 1, __PRETTY_FUNCTION__ , sizeof(__PRETTY_FUNCTION__) - 1, 134, }; nslog__log(&_nslog_ctx , "rsvg render:%d, width:%d, height %d", renderres, c->width , c->height); } } while(0); |
| 135 | |
| 136 | bitmap_format_to_client(bitmap, &(bitmap_fmt_t) { |
| 137 | .layout = BITMAP_LAYOUT_ARGB8888, |
| 138 | }); |
| 139 | guit->bitmap->modified(bitmap); |
| 140 | |
| 141 | cairo_destroy(cr); |
| 142 | cairo_surface_destroy(cs); |
| 143 | |
| 144 | return bitmap; |
| 145 | } |
| 146 | |
| 147 | static void rsvg__get_demensions(const rsvg_content *svgc, |
| 148 | int *width, int *height) |
| 149 | { |
| 150 | #if LIBRSVG_MAJOR_VERSION(2) >= 2 && LIBRSVG_MINOR_VERSION(54) >= 52 |
| 151 | gdouble rwidth; |
| 152 | gdouble rheight; |
| 153 | gboolean gotsize; |
| 154 | |
| 155 | gotsize = rsvg_handle_get_intrinsic_size_in_pixels(svgc->rsvgh, |
| 156 | &rwidth, |
| 157 | &rheight); |
| 158 | if (gotsize == TRUE(!(0))) { |
| 159 | *width = rwidth; |
| 160 | *height = rheight; |
| 161 | } else { |
| 162 | RsvgRectangle ink_rect; |
| 163 | RsvgRectangle logical_rect; |
| 164 | rsvg_handle_get_geometry_for_element(svgc->rsvgh, |
| 165 | NULL((void*)0), |
| 166 | &ink_rect, |
| 167 | &logical_rect, |
| 168 | NULL((void*)0)); |
| 169 | *width = ink_rect.width; |
| 170 | *height = ink_rect.height; |
| 171 | } |
| 172 | #else |
| 173 | RsvgDimensionData rsvgsize; |
| 174 | |
| 175 | rsvg_handle_get_dimensions(svgc->rsvgh, &rsvgsize); |
| 176 | *width = rsvgsize.width; |
| 177 | *height = rsvgsize.height; |
| 178 | #endif |
| 179 | NSLOG(netsurf, DEBUG, "rsvg width:%d height:%d.", *width, *height)do { if (NSLOG_LEVEL_DEBUG >= NSLOG_LEVEL_VERBOSE) { static nslog_entry_context_t _nslog_ctx = { &__nslog_category_netsurf , NSLOG_LEVEL_DEBUG, "content/handlers/image/rsvg246.c", sizeof ("content/handlers/image/rsvg246.c") - 1, __PRETTY_FUNCTION__ , sizeof(__PRETTY_FUNCTION__) - 1, 179, }; nslog__log(&_nslog_ctx , "rsvg width:%d height:%d.", *width, *height); } } while(0); |
| 180 | } |
| 181 | |
| 182 | static bool_Bool rsvg_convert(struct content *c) |
| 183 | { |
| 184 | rsvg_content *svgc = (rsvg_content *)c; |
| 185 | const uint8_t *data; /* content data */ |
| 186 | size_t size; /* content data size */ |
| 187 | GInputStream * istream; |
| 188 | GError *gerror = NULL((void*)0); |
| 189 | |
| 190 | /* check image header is valid and get width/height */ |
| 191 | |
| 192 | data = content__get_source_data(c, &size); |
| 193 | |
| 194 | istream = g_memory_input_stream_new_from_data(data, size, NULL((void*)0)); |
| 195 | svgc->rsvgh = rsvg_handle_new_from_stream_sync(istream, |
| 196 | NULL((void*)0), |
| 197 | RSVG_HANDLE_FLAGS_NONE, |
| 198 | NULL((void*)0), |
| 199 | &gerror); |
| 200 | g_object_unref(istream); |
| 201 | if (svgc->rsvgh == NULL((void*)0)) { |
| 202 | NSLOG(netsurf, INFO, "Failed to create rsvg handle for content.")do { if (NSLOG_LEVEL_INFO >= NSLOG_LEVEL_VERBOSE) { static nslog_entry_context_t _nslog_ctx = { &__nslog_category_netsurf , NSLOG_LEVEL_INFO, "content/handlers/image/rsvg246.c", sizeof ("content/handlers/image/rsvg246.c") - 1, __PRETTY_FUNCTION__ , sizeof(__PRETTY_FUNCTION__) - 1, 202, }; nslog__log(&_nslog_ctx , "Failed to create rsvg handle for content."); } } while(0); |
| 203 | return false0; |
| 204 | } |
| 205 | |
| 206 | rsvg__get_demensions(svgc, &c->width, &c->height); |
| 207 | |
| 208 | c->size = c->width * c->height * 4; |
| 209 | |
| 210 | image_cache_add(c, NULL((void*)0), rsvg_cache_convert); |
| 211 | |
| 212 | content_set_ready(c); |
| 213 | content_set_done(c); |
| 214 | content_set_status(c, ""); /* Done: update status bar */ |
| 215 | |
| 216 | return true1; |
| 217 | } |
| 218 | |
| 219 | |
| 220 | static nserror rsvg_clone(const struct content *old, struct content **newc) |
| 221 | { |
| 222 | rsvg_content *svg; |
| 223 | nserror error; |
| 224 | |
| 225 | svg = calloc(1, sizeof(rsvg_content)); |
| 226 | if (svg == NULL((void*)0)) |
| 227 | return NSERROR_NOMEM; |
| 228 | |
| 229 | error = content__clone(old, &svg->base); |
| 230 | if (error != NSERROR_OK) { |
| 231 | content_destroy(&svg->base); |
| 232 | return error; |
| 233 | } |
| 234 | |
| 235 | /* re-convert if the content is ready */ |
| 236 | if ((old->status == CONTENT_STATUS_READY) || |
| 237 | (old->status == CONTENT_STATUS_DONE)) { |
| 238 | if (rsvg_convert(&svg->base) == false0) { |
| 239 | content_destroy(&svg->base); |
| 240 | return NSERROR_CLONE_FAILED; |
| 241 | } |
| 242 | } |
| 243 | |
| 244 | *newc = (struct content *)svg; |
| 245 | |
| 246 | return NSERROR_OK; |
| 247 | } |
| 248 | |
| 249 | |
| 250 | static void rsvg_destroy(struct content *c) |
| 251 | { |
| 252 | rsvg_content *d = (rsvg_content *) c; |
| 253 | |
| 254 | if (d->rsvgh != NULL((void*)0)) { |
| 255 | g_object_unref(d->rsvgh); |
| 256 | d->rsvgh = NULL((void*)0); |
| 257 | } |
| 258 | |
| 259 | return image_cache_destroy(c); |
| 260 | } |
| 261 | |
| 262 | static const content_handler rsvg_content_handler = { |
| 263 | .create = rsvg_create, |
| 264 | .data_complete = rsvg_convert, |
| 265 | .destroy = rsvg_destroy, |
| 266 | .redraw = image_cache_redraw, |
| 267 | .clone = rsvg_clone, |
| 268 | .get_internal = image_cache_get_internal, |
| 269 | .type = image_cache_content_type, |
| 270 | .is_opaque = image_cache_is_opaque, |
| 271 | .no_share = false0, |
| 272 | }; |
| 273 | |
| 274 | static const char *rsvg_types[] = { |
| 275 | "image/svg", |
| 276 | "image/svg+xml" |
| 277 | }; |
| 278 | |
| 279 | CONTENT_FACTORY_REGISTER_TYPES(nsrsvg, rsvg_types, rsvg_content_handler)nserror nsrsvg_init(void) { uint32_t i; nserror error = NSERROR_OK ; for (i = 0; i < (sizeof(rsvg_types)/sizeof(*(rsvg_types) )); i++) { error = content_factory_register_handler( rsvg_types [i], &rsvg_content_handler); if (error != NSERROR_OK) break ; } return error; }; |
| 280 |