netsurf/content/handlers/image/svg.c

368 lines
7.8 KiB
C

/*
* Copyright 2007-2008 James Bursa <bursa@users.sourceforge.net>
*
* 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
* implementation of content for image/svg using libsvgtiny.
*/
#include <assert.h>
#include <limits.h>
#include <string.h>
#include <stdlib.h>
#include <svgtiny.h>
#include "utils/messages.h"
#include "utils/utils.h"
#include "netsurf/plotters.h"
#include "netsurf/content.h"
#include "content/content_protected.h"
#include "image/svg.h"
typedef struct svg_content {
struct content base;
struct svgtiny_diagram *diagram;
int current_width;
int current_height;
} svg_content;
static nserror svg_create_svg_data(svg_content *c)
{
union content_msg_data msg_data;
c->diagram = svgtiny_create();
if (c->diagram == NULL)
goto no_memory;
c->current_width = INT_MAX;
c->current_height = INT_MAX;
return NSERROR_OK;
no_memory:
msg_data.error = messages_get("NoMemory");
content_broadcast(&c->base, CONTENT_MSG_ERROR, &msg_data);
return NSERROR_NOMEM;
}
/**
* Create a CONTENT_SVG.
*/
static nserror svg_create(const content_handler *handler,
lwc_string *imime_type, const struct http_parameter *params,
struct llcache_handle *llcache, const char *fallback_charset,
bool quirks, struct content **c)
{
svg_content *svg;
nserror error;
svg = calloc(1, sizeof(svg_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 = svg_create_svg_data(svg);
if (error != NSERROR_OK) {
free(svg);
return error;
}
*c = (struct content *) svg;
return NSERROR_OK;
}
/**
* Convert a CONTENT_SVG for display.
*/
static bool svg_convert(struct content *c)
{
/*c->title = malloc(100);
if (c->title)
snprintf(c->title, 100, messages_get("svgTitle"),
width, height, c->source_size);*/
//c->size += ?;
content_set_ready(c);
content_set_done(c);
/* Done: update status bar */
content_set_status(c, "");
return true;
}
/**
* Reformat a CONTENT_SVG.
*/
static void svg_reformat(struct content *c, int width, int height)
{
svg_content *svg = (svg_content *) c;
const char *source_data;
unsigned long source_size;
assert(svg->diagram);
/* Avoid reformats to same width/height as we already reformatted to */
if (width != svg->current_width || height != svg->current_height) {
source_data = content__get_source_data(c, &source_size);
svgtiny_parse(svg->diagram, source_data, source_size,
nsurl_access(content_get_url(c)),
width, height);
svg->current_width = width;
svg->current_height = height;
}
c->width = svg->diagram->width;
c->height = svg->diagram->height;
}
/**
* Redraw a CONTENT_SVG.
*/
static bool
svg_redraw_internal(struct content *c,
int x,
int y,
int width,
int height,
const struct rect *clip,
const struct redraw_context *ctx,
float scale,
colour background_colour)
{
svg_content *svg = (svg_content *) c;
float transform[6];
struct svgtiny_diagram *diagram = svg->diagram;
int px, py;
unsigned int i;
plot_font_style_t fstyle = *plot_style_font;
plot_style_t pstyle;
nserror res;
assert(diagram);
transform[0] = (float) width / (float) c->width;
transform[1] = 0;
transform[2] = 0;
transform[3] = (float) height / (float) c->height;
transform[4] = x;
transform[5] = y;
#define BGR(c) ((c) == svgtiny_TRANSPARENT ? NS_TRANSPARENT : \
((svgtiny_RED((c))) | \
(svgtiny_GREEN((c)) << 8) | \
(svgtiny_BLUE((c)) << 16)))
for (i = 0; i != diagram->shape_count; i++) {
if (diagram->shape[i].path) {
pstyle.stroke_colour = BGR(diagram->shape[i].stroke);
pstyle.fill_colour = BGR(diagram->shape[i].fill);
res = ctx->plot->path(ctx,
&pstyle,
diagram->shape[i].path,
diagram->shape[i].path_length,
diagram->shape[i].stroke_width,
transform);
if (res != NSERROR_OK) {
return false;
}
} else if (diagram->shape[i].text) {
px = transform[0] * diagram->shape[i].text_x +
transform[2] * diagram->shape[i].text_y +
transform[4];
py = transform[1] * diagram->shape[i].text_x +
transform[3] * diagram->shape[i].text_y +
transform[5];
fstyle.background = 0xffffff;
fstyle.foreground = 0x000000;
fstyle.size = (8 * FONT_SIZE_SCALE) * scale;
res = ctx->plot->text(ctx,
&fstyle,
px, py,
diagram->shape[i].text,
strlen(diagram->shape[i].text));
if (res != NSERROR_OK) {
return false;
}
}
}
#undef BGR
return true;
}
/**
* Redraw a CONTENT_SVG.
*/
static bool svg_redraw(struct content *c, struct content_redraw_data *data,
const struct rect *clip, const struct redraw_context *ctx)
{
int x = data->x;
int y = data->y;
if ((data->width <= 0) && (data->height <= 0)) {
/* No point trying to plot SVG if it does not occupy a valid
* area */
return true;
}
if ((data->repeat_x == false) && (data->repeat_y == false)) {
/* Simple case: SVG is not tiled */
return svg_redraw_internal(c, x, y,
data->width, data->height,
clip, ctx, data->scale,
data->background_colour);
} else {
/* Tiled redraw required. SVG repeats to extents of clip
* rectangle, in x, y or both directions */
int x0, y0, x1, y1;
/* Find the redraw boundaries to loop within */
x0 = x;
if (data->repeat_x) {
for (; x0 > clip->x0; x0 -= data->width);
x1 = clip->x1;
} else {
x1 = x + 1;
}
y0 = y;
if (data->repeat_y) {
for (; y0 > clip->y0; y0 -= data->height);
y1 = clip->y1;
} else {
y1 = y + 1;
}
/* Repeatedly plot the SVG across the area */
for (y = y0; y < y1; y += data->height) {
for (x = x0; x < x1; x += data->width) {
if (!svg_redraw_internal(c, x, y,
data->width, data->height,
clip, ctx, data->scale,
data->background_colour)) {
return false;
}
}
}
}
return true;
}
/**
* Destroy a CONTENT_SVG and free all resources it owns.
*/
static void svg_destroy(struct content *c)
{
svg_content *svg = (svg_content *) c;
if (svg->diagram != NULL)
svgtiny_free(svg->diagram);
}
static nserror svg_clone(const struct content *old, struct content **newc)
{
svg_content *svg;
nserror error;
svg = calloc(1, sizeof(svg_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/convert */
error = svg_create_svg_data(svg);
if (error != NSERROR_OK) {
content_destroy(&svg->base);
return error;
}
if (old->status == CONTENT_STATUS_READY ||
old->status == CONTENT_STATUS_DONE) {
if (svg_convert(&svg->base) == false) {
content_destroy(&svg->base);
return NSERROR_CLONE_FAILED;
}
}
*newc = (struct content *) svg;
return NSERROR_OK;
}
static content_type svg_content_type(void)
{
return CONTENT_IMAGE;
}
static const content_handler svg_content_handler = {
.create = svg_create,
.data_complete = svg_convert,
.reformat = svg_reformat,
.destroy = svg_destroy,
.redraw = svg_redraw,
.clone = svg_clone,
.type = svg_content_type,
.no_share = true
};
static const char *svg_types[] = {
"image/svg",
"image/svg+xml"
};
CONTENT_FACTORY_REGISTER_TYPES(svg, svg_types, svg_content_handler);