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
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--- /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);
+