diff options
Diffstat (limited to 'content/handlers/image/rsvg.c')
-rw-r--r-- | content/handlers/image/rsvg.c | 326 |
1 files changed, 326 insertions, 0 deletions
diff --git a/content/handlers/image/rsvg.c b/content/handlers/image/rsvg.c new file mode 100644 index 000000000..bd773682f --- /dev/null +++ b/content/handlers/image/rsvg.c @@ -0,0 +1,326 @@ +/* + * Copyright 2007 Rob Kendrick <rjek@netsurf-browser.org> + * + * This file is part of NetSurf, http://www.netsurf-browser.org/ + * + * NetSurf is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * NetSurf is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +/** \file + * Content handler for image/svg using librsvg (implementation). + * + * SVG files are rendered to a NetSurf bitmap by creating a Cairo rendering + * surface (content_rsvg_data.cs) over the bitmap's data, creating a Cairo + * drawing context using that surface, and then passing that drawing context + * to librsvg which then uses Cairo calls to plot the graphic to the bitmap. + * We store this in content->bitmap, and then use the usual bitmap plotter + * function to render it for redraw requests. + */ + +#include <stdlib.h> +#include <stdbool.h> +#include <assert.h> +#include <string.h> +#include <sys/types.h> + +#include <librsvg/rsvg.h> +#ifndef RSVG_CAIRO_H +#include <librsvg/rsvg-cairo.h> +#endif + +#include "utils/log.h" +#include "utils/utils.h" +#include "utils/messages.h" +#include "content/content_protected.h" +#include "desktop/plotters.h" +#include "desktop/gui_internal.h" + +#include "bitmap.h" +#include "rsvg.h" + +typedef struct rsvg_content { + struct content base; + + RsvgHandle *rsvgh; /**< Context handle for RSVG renderer */ + cairo_surface_t *cs; /**< The surface built inside a nsbitmap */ + cairo_t *ct; /**< Cairo drawing context */ + struct bitmap *bitmap; /**< Created NetSurf bitmap */ +} rsvg_content; + +static nserror rsvg_create_svg_data(rsvg_content *c) +{ + union content_msg_data msg_data; + + c->rsvgh = NULL; + c->cs = NULL; + c->ct = NULL; + c->bitmap = NULL; + + if ((c->rsvgh = rsvg_handle_new()) == NULL) { + LOG("rsvg_handle_new() returned NULL."); + msg_data.error = messages_get("NoMemory"); + content_broadcast(&c->base, CONTENT_MSG_ERROR, msg_data); + return NSERROR_NOMEM; + } + + return NSERROR_OK; +} + + +static nserror rsvg_create(const content_handler *handler, + lwc_string *imime_type, const struct http_parameter *params, + llcache_handle *llcache, const char *fallback_charset, + bool quirks, struct content **c) +{ + rsvg_content *svg; + nserror error; + + svg = calloc(1, sizeof(rsvg_content)); + if (svg == NULL) + return NSERROR_NOMEM; + + error = content__init(&svg->base, handler, imime_type, params, + llcache, fallback_charset, quirks); + if (error != NSERROR_OK) { + free(svg); + return error; + } + + error = rsvg_create_svg_data(svg); + if (error != NSERROR_OK) { + free(svg); + return error; + } + + *c = (struct content *) svg; + + return NSERROR_OK; +} + + +static bool rsvg_process_data(struct content *c, const char *data, + unsigned int size) +{ + rsvg_content *d = (rsvg_content *) c; + union content_msg_data msg_data; + GError *err = NULL; + + if (rsvg_handle_write(d->rsvgh, (const guchar *)data, (gsize)size, + &err) == FALSE) { + LOG("rsvg_handle_write returned an error: %s", err->message); + msg_data.error = err->message; + content_broadcast(c, CONTENT_MSG_ERROR, msg_data); + return false; + } + + return true; +} + +/** Convert Cairo's ARGB output to NetSurf's favoured ABGR format. It converts + * the data in-place. + * + * \param pixels Pixel data, in the form of ARGB. This will + * be overwritten with new data in the form of ABGR. + * \param width Width of the bitmap + * \param height Height of the bitmap + * \param rowstride Number of bytes to skip after each row (this + * implementation requires this to be a multiple of 4.) + */ +static inline void rsvg_argb_to_abgr(uint8_t *pixels, + int width, int height, size_t rowstride) +{ + uint8_t *p = pixels; + + for (int y = 0; y < height; y++) { + for (int x = 0; x < width; x++) { + /* Swap R and B */ + const uint8_t r = p[x+3]; + + p[x+3] = p[x]; + + p[x] = r; + } + + p += rowstride; + } +} + +static bool rsvg_convert(struct content *c) +{ + rsvg_content *d = (rsvg_content *) c; + union content_msg_data msg_data; + RsvgDimensionData rsvgsize; + GError *err = NULL; + + if (rsvg_handle_close(d->rsvgh, &err) == FALSE) { + LOG("rsvg_handle_close returned an error: %s", err->message); + msg_data.error = err->message; + content_broadcast(c, CONTENT_MSG_ERROR, msg_data); + return false; + } + + assert(err == NULL); + + /* we should now be able to query librsvg for the natural size of the + * graphic, so we can create our bitmap. + */ + + rsvg_handle_get_dimensions(d->rsvgh, &rsvgsize); + c->width = rsvgsize.width; + c->height = rsvgsize.height; + + if ((d->bitmap = guit->bitmap->create(c->width, c->height, + BITMAP_NEW)) == NULL) { + LOG("Failed to create bitmap for rsvg render."); + msg_data.error = messages_get("NoMemory"); + content_broadcast(c, CONTENT_MSG_ERROR, msg_data); + return false; + } + + if ((d->cs = cairo_image_surface_create_for_data( + (unsigned char *)guit->bitmap->get_buffer(d->bitmap), + CAIRO_FORMAT_ARGB32, + c->width, c->height, + guit->bitmap->get_rowstride(d->bitmap))) == NULL) { + LOG("Failed to create Cairo image surface for rsvg render."); + msg_data.error = messages_get("NoMemory"); + content_broadcast(c, CONTENT_MSG_ERROR, msg_data); + return false; + } + + if ((d->ct = cairo_create(d->cs)) == NULL) { + LOG("Failed to create Cairo drawing context for rsvg render."); + msg_data.error = messages_get("NoMemory"); + content_broadcast(c, CONTENT_MSG_ERROR, msg_data); + return false; + } + + rsvg_handle_render_cairo(d->rsvgh, d->ct); + rsvg_argb_to_abgr(guit->bitmap->get_buffer(d->bitmap), + c->width, c->height, + guit->bitmap->get_rowstride(d->bitmap)); + + guit->bitmap->modified(d->bitmap); + content_set_ready(c); + content_set_done(c); + /* Done: update status bar */ + content_set_status(c, ""); + + return true; +} + +static bool rsvg_redraw(struct content *c, struct content_redraw_data *data, + const struct rect *clip, const struct redraw_context *ctx) +{ + rsvg_content *rsvgcontent = (rsvg_content *) c; + bitmap_flags_t flags = BITMAPF_NONE; + + assert(rsvgcontent->bitmap != NULL); + + if (data->repeat_x) + flags |= BITMAPF_REPEAT_X; + if (data->repeat_y) + flags |= BITMAPF_REPEAT_Y; + + return ctx->plot->bitmap(data->x, data->y, data->width, data->height, + rsvgcontent->bitmap, data->background_colour, flags); +} + +static void rsvg_destroy(struct content *c) +{ + rsvg_content *d = (rsvg_content *) c; + + if (d->bitmap != NULL) guit->bitmap->destroy(d->bitmap); + if (d->rsvgh != NULL) g_object_unref(d->rsvgh); + if (d->ct != NULL) cairo_destroy(d->ct); + if (d->cs != NULL) cairo_surface_destroy(d->cs); + + return; +} + +static nserror rsvg_clone(const struct content *old, struct content **newc) +{ + rsvg_content *svg; + nserror error; + const char *data; + unsigned long size; + + svg = calloc(1, sizeof(rsvg_content)); + if (svg == NULL) + return NSERROR_NOMEM; + + error = content__clone(old, &svg->base); + if (error != NSERROR_OK) { + content_destroy(&svg->base); + return error; + } + + /* Simply replay create/process/convert */ + error = rsvg_create_svg_data(svg); + if (error != NSERROR_OK) { + content_destroy(&svg->base); + return error; + } + + data = content__get_source_data(&svg->base, &size); + if (size > 0) { + if (rsvg_process_data(&svg->base, data, size) == false) { + content_destroy(&svg->base); + return NSERROR_NOMEM; + } + } + + if (old->status == CONTENT_STATUS_READY || + old->status == CONTENT_STATUS_DONE) { + if (rsvg_convert(&svg->base) == false) { + content_destroy(&svg->base); + return NSERROR_CLONE_FAILED; + } + } + + *newc = (struct content *) svg; + + return NSERROR_OK; +} + +static void *rsvg_get_internal(const struct content *c, void *context) +{ + rsvg_content *d = (rsvg_content *) c; + + return d->bitmap; +} + +static content_type rsvg_content_type(void) +{ + return CONTENT_IMAGE; +} + +static const content_handler rsvg_content_handler = { + .create = rsvg_create, + .process_data = rsvg_process_data, + .data_complete = rsvg_convert, + .destroy = rsvg_destroy, + .redraw = rsvg_redraw, + .clone = rsvg_clone, + .get_internal = rsvg_get_internal, + .type = rsvg_content_type, + .no_share = false, +}; + +static const char *rsvg_types[] = { + "image/svg", + "image/svg+xml" +}; + +CONTENT_FACTORY_REGISTER_TYPES(nsrsvg, rsvg_types, rsvg_content_handler); + |