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281 lines
6.9 KiB
281 lines
6.9 KiB
/*
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* Copyright 2022 Vincent Sanders <vince@netsurf-browser.org>
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*
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* This file is part of NetSurf, http://www.netsurf-browser.org/
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*
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* NetSurf is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* NetSurf is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* \file
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* implementation of content handler for image/svg using librsvg 2.46 API.
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*
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* SVG files are rendered to a NetSurf bitmap by creating a Cairo rendering
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* surface (content_rsvg_data.cs) over the bitmap's data, creating a Cairo
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* drawing context using that surface, and then passing that drawing context
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* to librsvg which then uses Cairo calls to plot the graphic to the bitmap.
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* We store this in content->bitmap, and then use the usual bitmap plotter
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* function to render it for redraw requests.
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*/
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#include <stdlib.h>
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#include <stdbool.h>
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#include <assert.h>
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#include <string.h>
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#include <sys/types.h>
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#include <librsvg/rsvg.h>
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#include <nsutils/endian.h>
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#include "utils/log.h"
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#include "utils/utils.h"
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#include "utils/messages.h"
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#include "netsurf/plotters.h"
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#include "netsurf/bitmap.h"
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#include "netsurf/content.h"
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#include "content/llcache.h"
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#include "content/content_protected.h"
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#include "content/content_factory.h"
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#include "desktop/gui_internal.h"
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#include "desktop/bitmap.h"
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#include "image/image_cache.h"
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#include "image/rsvg.h"
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typedef struct rsvg_content {
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struct content base;
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RsvgHandle *rsvgh; /**< Context handle for RSVG renderer */
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} rsvg_content;
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static nserror
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rsvg_create(const content_handler *handler,
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lwc_string *imime_type,
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const struct http_parameter *params,
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llcache_handle *llcache,
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const char *fallback_charset,
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bool quirks,
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struct content **c)
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{
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rsvg_content *svg;
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nserror error;
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svg = calloc(1, sizeof(rsvg_content));
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if (svg == NULL)
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return NSERROR_NOMEM;
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error = content__init(&svg->base, handler, imime_type, params,
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llcache, fallback_charset, quirks);
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if (error != NSERROR_OK) {
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free(svg);
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return error;
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}
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*c = (struct content *)svg;
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return NSERROR_OK;
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}
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/**
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* create a bitmap from jpeg content for the image cache.
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*/
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static struct bitmap *
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rsvg_cache_convert(struct content *c)
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{
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rsvg_content *svgc = (rsvg_content *)c;
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struct bitmap *bitmap;
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cairo_surface_t *cs;
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cairo_t *cr;
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RsvgRectangle viewport;
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gboolean renderres;
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if ((bitmap = guit->bitmap->create(c->width, c->height, BITMAP_NONE)) == NULL) {
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NSLOG(netsurf, INFO, "Failed to create bitmap for rsvg render.");
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return NULL;
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}
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if ((cs = cairo_image_surface_create_for_data(
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(unsigned char *)guit->bitmap->get_buffer(bitmap),
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CAIRO_FORMAT_ARGB32,
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c->width, c->height,
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guit->bitmap->get_rowstride(bitmap))) == NULL) {
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NSLOG(netsurf, INFO, "Failed to create Cairo image surface for rsvg render.");
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guit->bitmap->destroy(bitmap);
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return NULL;
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}
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if ((cr = cairo_create(cs)) == NULL) {
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NSLOG(netsurf, INFO,
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"Failed to create Cairo drawing context for rsvg render.");
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cairo_surface_destroy(cs);
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guit->bitmap->destroy(bitmap);
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return NULL;
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}
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viewport.x = 0;
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viewport.y = 0;
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viewport.width = c->width;
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viewport.height = c->height;
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renderres = rsvg_handle_render_document(svgc->rsvgh, cr, &viewport, NULL);
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NSLOG(netsurf, DEBUG, "rsvg render:%d, width:%d, height %d", renderres, c->width, c->height);
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bitmap_format_to_client(bitmap, &(bitmap_fmt_t) {
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.layout = BITMAP_LAYOUT_ARGB8888,
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});
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guit->bitmap->modified(bitmap);
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cairo_destroy(cr);
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cairo_surface_destroy(cs);
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return bitmap;
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}
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static void rsvg__get_demensions(const rsvg_content *svgc,
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int *width, int *height)
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{
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#if LIBRSVG_MAJOR_VERSION >= 2 && LIBRSVG_MINOR_VERSION >= 52
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gdouble rwidth;
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gdouble rheight;
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gboolean gotsize;
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gotsize = rsvg_handle_get_intrinsic_size_in_pixels(svgc->rsvgh,
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&rwidth,
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&rheight);
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if (gotsize == TRUE) {
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*width = rwidth;
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*height = rheight;
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} else {
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RsvgRectangle ink_rect;
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RsvgRectangle logical_rect;
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rsvg_handle_get_geometry_for_element(svgc->rsvgh,
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NULL,
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&ink_rect,
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&logical_rect,
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NULL);
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*width = ink_rect.width;
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*height = ink_rect.height;
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}
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#else
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RsvgDimensionData rsvgsize;
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rsvg_handle_get_dimensions(svgc->rsvgh, &rsvgsize);
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*width = rsvgsize.width;
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*height = rsvgsize.height;
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#endif
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NSLOG(netsurf, DEBUG, "rsvg width:%d height:%d.", *width, *height);
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}
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static bool rsvg_convert(struct content *c)
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{
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rsvg_content *svgc = (rsvg_content *)c;
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const uint8_t *data; /* content data */
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size_t size; /* content data size */
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GInputStream * istream;
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GError *gerror = NULL;
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/* check image header is valid and get width/height */
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data = content__get_source_data(c, &size);
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istream = g_memory_input_stream_new_from_data(data, size, NULL);
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svgc->rsvgh = rsvg_handle_new_from_stream_sync(istream,
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NULL,
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RSVG_HANDLE_FLAGS_NONE,
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NULL,
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&gerror);
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g_object_unref(istream);
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if (svgc->rsvgh == NULL) {
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NSLOG(netsurf, INFO, "Failed to create rsvg handle for content.");
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return false;
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}
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rsvg__get_demensions(svgc, &c->width, &c->height);
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c->size = c->width * c->height * 4;
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image_cache_add(c, NULL, rsvg_cache_convert);
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content_set_ready(c);
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content_set_done(c);
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content_set_status(c, ""); /* Done: update status bar */
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return true;
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}
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static nserror rsvg_clone(const struct content *old, struct content **newc)
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{
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rsvg_content *svg;
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nserror error;
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svg = calloc(1, sizeof(rsvg_content));
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if (svg == NULL)
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return NSERROR_NOMEM;
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error = content__clone(old, &svg->base);
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if (error != NSERROR_OK) {
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content_destroy(&svg->base);
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return error;
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}
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/* re-convert if the content is ready */
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if ((old->status == CONTENT_STATUS_READY) ||
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(old->status == CONTENT_STATUS_DONE)) {
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if (rsvg_convert(&svg->base) == false) {
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content_destroy(&svg->base);
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return NSERROR_CLONE_FAILED;
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}
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}
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*newc = (struct content *)svg;
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return NSERROR_OK;
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}
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static void rsvg_destroy(struct content *c)
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{
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rsvg_content *d = (rsvg_content *) c;
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if (d->rsvgh != NULL) {
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g_object_unref(d->rsvgh);
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d->rsvgh = NULL;
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}
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return image_cache_destroy(c);
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}
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static const content_handler rsvg_content_handler = {
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.create = rsvg_create,
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.data_complete = rsvg_convert,
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.destroy = rsvg_destroy,
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.redraw = image_cache_redraw,
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.clone = rsvg_clone,
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.get_internal = image_cache_get_internal,
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.type = image_cache_content_type,
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.is_opaque = image_cache_is_opaque,
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.no_share = false,
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};
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static const char *rsvg_types[] = {
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"image/svg",
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"image/svg+xml"
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};
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CONTENT_FACTORY_REGISTER_TYPES(nsrsvg, rsvg_types, rsvg_content_handler);
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