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 "netsurf/plotters.h"
#include "netsurf/content.h"
#include "content/content.h"
#include "content/content_protected.h"
#include "content/content_factory.h"
#include "content/llcache.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 uint8_t *source_data;
        size_t 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) {
                NSLOG(netsurf, INFO, "xdrawfile_bbox: 0x%x: %s",
                      error->errnum, error->errmess);
                msg_data.errordata.errorcode = NSERROR_UNKNOWN;
                msg_data.errordata.errormsg = 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 uint8_t *source_data;
        size_t source_size;
        const void *src_data;
        os_error *error;
 
        if (ctx->plot->flush && (ctx->plot->flush(ctx) != NSERROR_OK))
                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) {
                NSLOG(netsurf, INFO, "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