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diff --git a/frontends/riscos/content-handlers/draw.c b/frontends/riscos/content-handlers/draw.c
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+/*
+ * Copyright 2003 John M Bell <jmb202@ecs.soton.ac.uk>
+ *
+ * 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 for image/x-drawfile (RISC OS implementation).
+ *
+ * The DrawFile module is used to plot the DrawFile.
+ */
+
+#include "utils/config.h"
+#ifdef WITH_DRAW
+
+#include <string.h>
+#include <stdlib.h>
+#include "oslib/drawfile.h"
+
+#include "utils/config.h"
+#include "utils/log.h"
+#include "utils/messages.h"
+#include "utils/utils.h"
+#include "content/content_protected.h"
+#include "desktop/plotters.h"
+
+#include "riscos/content-handlers/draw.h"
+#include "riscos/gui.h"
+
+typedef struct draw_content {
+ struct content base;
+
+ int x0, y0;
+} draw_content;
+
+static nserror draw_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);
+static bool draw_convert(struct content *c);
+static void draw_destroy(struct content *c);
+static bool draw_redraw(struct content *c, struct content_redraw_data *data,
+ const struct rect *clip, const struct redraw_context *ctx);
+static nserror draw_clone(const struct content *old, struct content **newc);
+static content_type draw_content_type(void);
+
+static const content_handler draw_content_handler = {
+ .create = draw_create,
+ .data_complete = draw_convert,
+ .destroy = draw_destroy,
+ .redraw = draw_redraw,
+ .clone = draw_clone,
+ .type = draw_content_type,
+ .no_share = false,
+};
+
+static const char *draw_types[] = {
+ "application/drawfile",
+ "application/x-drawfile",
+ "image/drawfile",
+ "image/x-drawfile"
+};
+
+CONTENT_FACTORY_REGISTER_TYPES(draw, draw_types, draw_content_handler)
+
+nserror draw_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)
+{
+ draw_content *draw;
+ nserror error;
+
+ draw = calloc(1, sizeof(draw_content));
+ if (draw == NULL)
+ return NSERROR_NOMEM;
+
+ error = content__init(&draw->base, handler, imime_type, params,
+ llcache, fallback_charset, quirks);
+ if (error != NSERROR_OK) {
+ free(draw);
+ return error;
+ }
+
+ *c = (struct content *) draw;
+
+ return NSERROR_OK;
+}
+
+/**
+ * Convert a CONTENT_DRAW for display.
+ *
+ * No conversion is necessary. We merely read the DrawFile dimensions and
+ * bounding box bottom-left.
+ */
+
+bool draw_convert(struct content *c)
+{
+ draw_content *draw = (draw_content *) c;
+ union content_msg_data msg_data;
+ const char *source_data;
+ unsigned long source_size;
+ const void *data;
+ os_box bbox;
+ os_error *error;
+ char *title;
+
+ source_data = content__get_source_data(c, &source_size);
+ data = source_data;
+
+ /* BBox contents in Draw units (256*OS unit) */
+ error = xdrawfile_bbox(0, (drawfile_diagram *) data,
+ (int) source_size, 0, &bbox);
+ if (error) {
+ LOG("xdrawfile_bbox: 0x%x: %s", error->errnum, error->errmess);
+ msg_data.error = error->errmess;
+ content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
+ return false;
+ }
+
+ if (bbox.x1 > bbox.x0 && bbox.y1 > bbox.y0) {
+ /* c->width & c->height stored as (OS units/2)
+ => divide by 512 to convert from draw units */
+ c->width = ((bbox.x1 - bbox.x0) / 512);
+ c->height = ((bbox.y1 - bbox.y0) / 512);
+ }
+ else
+ /* invalid/undefined bounding box */
+ c->height = c->width = 0;
+
+ draw->x0 = bbox.x0;
+ draw->y0 = bbox.y0;
+
+ title = messages_get_buff("DrawTitle",
+ nsurl_access_leaf(llcache_handle_get_url(c->llcache)),
+ c->width, c->height);
+ if (title != NULL) {
+ content__set_title(c, title);
+ free(title);
+ }
+
+ content_set_ready(c);
+ content_set_done(c);
+ /* Done: update status bar */
+ content_set_status(c, "");
+ return true;
+}
+
+
+/**
+ * Destroy a CONTENT_DRAW and free all resources it owns.
+ */
+
+void draw_destroy(struct content *c)
+{
+}
+
+
+/**
+ * Redraw a CONTENT_DRAW.
+ */
+
+bool draw_redraw(struct content *c, struct content_redraw_data *data,
+ const struct rect *clip, const struct redraw_context *ctx)
+{
+ draw_content *draw = (draw_content *) c;
+ os_trfm matrix;
+ const char *source_data;
+ unsigned long source_size;
+ const void *src_data;
+ os_error *error;
+
+ if (ctx->plot->flush && !ctx->plot->flush())
+ return false;
+
+ if (!c->width || !c->height)
+ return false;
+
+ source_data = content__get_source_data(c, &source_size);
+ src_data = source_data;
+
+ /* Scaled image. Transform units (65536*OS units) */
+ matrix.entries[0][0] = data->width * 65536 / c->width;
+ matrix.entries[0][1] = 0;
+ matrix.entries[1][0] = 0;
+ matrix.entries[1][1] = data->height * 65536 / c->height;
+ /* Draw units. (x,y) = bottom left */
+ matrix.entries[2][0] = ro_plot_origin_x * 256 + data->x * 512 -
+ draw->x0 * data->width / c->width;
+ matrix.entries[2][1] = ro_plot_origin_y * 256 -
+ (data->y + data->height) * 512 -
+ draw->y0 * data->height / c->height;
+
+ error = xdrawfile_render(0, (drawfile_diagram *) src_data,
+ (int) source_size, &matrix, 0, 0);
+ if (error) {
+ LOG("xdrawfile_render: 0x%x: %s", error->errnum, error->errmess);
+ return false;
+ }
+
+ return true;
+}
+
+/**
+ * Clone a CONTENT_DRAW
+ */
+
+nserror draw_clone(const struct content *old, struct content **newc)
+{
+ draw_content *draw;
+ nserror error;
+
+ draw = calloc(1, sizeof(draw_content));
+ if (draw == NULL)
+ return NSERROR_NOMEM;
+
+ error = content__clone(old, &draw->base);
+ if (error != NSERROR_OK) {
+ content_destroy(&draw->base);
+ return error;
+ }
+
+ /* Simply rerun convert */
+ if (old->status == CONTENT_STATUS_READY ||
+ old->status == CONTENT_STATUS_DONE) {
+ if (draw_convert(&draw->base) == false) {
+ content_destroy(&draw->base);
+ return NSERROR_CLONE_FAILED;
+ }
+ }
+
+ *newc = (struct content *) draw;
+
+ return NSERROR_OK;
+}
+
+content_type draw_content_type(void)
+{
+ return CONTENT_IMAGE;
+}
+
+#endif