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PIKApp/app/vectors/pikavectors-import.c

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/* PIKA - Photo and Image Kooker Application
* a rebranding of The GNU Image Manipulation Program (created with heckimp)
* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
*
* Original copyright, applying to most contents (license remains unchanged):
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* PikaVectors Import
* Copyright (C) 2003-2004 Sven Neumann <sven@gimp.org>
*
* Some code here is based on code from librsvg that was originally
* written by Raph Levien <raph@artofcode.com> for Gill.
*
* This SVG path importer implements a subset of SVG that is
* sufficient to parse path elements and basic shapes and to apply
* transformations as described by the SVG specification:
* http://www.w3.org/TR/SVG/. It must handle the SVG files exported
* by PIKA but it is also supposed to be able to extract paths and
* shapes from foreign SVG documents.
*
* This program 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; either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <string.h>
#include <errno.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <gegl.h>
#include "libpikabase/pikabase.h"
#include "libpikamath/pikamath.h"
#include "vectors-types.h"
#include "config/pikaxmlparser.h"
#include "core/pikaerror.h"
#include "core/pikaimage.h"
#include "core/pikaimage-undo.h"
#include "pikabezierstroke.h"
#include "pikastroke.h"
#include "pikavectors.h"
#include "pikavectors-import.h"
#include "pika-intl.h"
#define COORDS_INIT \
{ \
.x = 0.0, \
.y = 0.0, \
.pressure = 1.0, \
.xtilt = 0.0, \
.ytilt = 0.0, \
.wheel = 0.5, \
.velocity = 0.0, \
.direction = 0.0 \
}
typedef struct
{
GQueue *stack;
PikaImage *image;
gboolean scale;
gint svg_depth;
} SvgParser;
typedef struct _SvgHandler SvgHandler;
struct _SvgHandler
{
const gchar *name;
void (* start) (SvgHandler *handler,
const gchar **names,
const gchar **values,
SvgParser *parser);
void (* end) (SvgHandler *handler,
SvgParser *parser);
gdouble width;
gdouble height;
gchar *id;
GList *paths;
PikaMatrix3 *transform;
};
typedef struct
{
gchar *id;
GList *strokes;
} SvgPath;
static gboolean pika_vectors_import (PikaImage *image,
GFile *file,
const gchar *str,
gsize len,
gboolean merge,
gboolean scale,
PikaVectors *parent,
gint position,
GList **ret_vectors,
GError **error);
static void svg_parser_start_element (GMarkupParseContext *context,
const gchar *element_name,
const gchar **attribute_names,
const gchar **attribute_values,
gpointer user_data,
GError **error);
static void svg_parser_end_element (GMarkupParseContext *context,
const gchar *element_name,
gpointer user_data,
GError **error);
static const GMarkupParser markup_parser =
{
svg_parser_start_element,
svg_parser_end_element,
NULL, /* characters */
NULL, /* passthrough */
NULL /* error */
};
static void svg_handler_svg_start (SvgHandler *handler,
const gchar **names,
const gchar **values,
SvgParser *parser);
static void svg_handler_svg_end (SvgHandler *handler,
SvgParser *parser);
static void svg_handler_group_start (SvgHandler *handler,
const gchar **names,
const gchar **values,
SvgParser *parser);
static void svg_handler_path_start (SvgHandler *handler,
const gchar **names,
const gchar **values,
SvgParser *parser);
static void svg_handler_rect_start (SvgHandler *handler,
const gchar **names,
const gchar **values,
SvgParser *parser);
static void svg_handler_ellipse_start (SvgHandler *handler,
const gchar **names,
const gchar **values,
SvgParser *parser);
static void svg_handler_line_start (SvgHandler *handler,
const gchar **names,
const gchar **values,
SvgParser *parser);
static void svg_handler_poly_start (SvgHandler *handler,
const gchar **names,
const gchar **values,
SvgParser *parser);
static const SvgHandler svg_handlers[] =
{
{ "svg", svg_handler_svg_start, svg_handler_svg_end },
{ "g", svg_handler_group_start, NULL },
{ "path", svg_handler_path_start, NULL },
{ "rect", svg_handler_rect_start, NULL },
{ "circle", svg_handler_ellipse_start, NULL },
{ "ellipse", svg_handler_ellipse_start, NULL },
{ "line", svg_handler_line_start, NULL },
{ "polyline", svg_handler_poly_start, NULL },
{ "polygon", svg_handler_poly_start, NULL }
};
static gboolean parse_svg_length (const gchar *value,
gdouble reference,
gdouble resolution,
gdouble *length);
static gboolean parse_svg_viewbox (const gchar *value,
gdouble *width,
gdouble *height,
PikaMatrix3 *matrix);
static gboolean parse_svg_transform (const gchar *value,
PikaMatrix3 *matrix);
static GList * parse_path_data (const gchar *data);
/**
* pika_vectors_import_file:
* @image: the #PikaImage to add the paths to
* @file: a SVG file
* @merge: should multiple paths be merged into a single #PikaVectors object
* @scale: should the SVG be scaled to fit the image dimensions
* @position: position in the image's vectors stack where to add the vectors
* @error: location to store possible errors
*
* Imports one or more paths and basic shapes from a SVG file.
*
* Returns: %TRUE on success, %FALSE if an error occurred
**/
gboolean
pika_vectors_import_file (PikaImage *image,
GFile *file,
gboolean merge,
gboolean scale,
PikaVectors *parent,
gint position,
GList **ret_vectors,
GError **error)
{
g_return_val_if_fail (PIKA_IS_IMAGE (image), FALSE);
g_return_val_if_fail (G_IS_FILE (file), FALSE);
g_return_val_if_fail (parent == NULL ||
parent == PIKA_IMAGE_ACTIVE_PARENT ||
PIKA_IS_VECTORS (parent), FALSE);
g_return_val_if_fail (parent == NULL ||
parent == PIKA_IMAGE_ACTIVE_PARENT ||
pika_item_is_attached (PIKA_ITEM (parent)), FALSE);
g_return_val_if_fail (parent == NULL ||
parent == PIKA_IMAGE_ACTIVE_PARENT ||
pika_item_get_image (PIKA_ITEM (parent)) == image,
FALSE);
g_return_val_if_fail (parent == NULL ||
parent == PIKA_IMAGE_ACTIVE_PARENT ||
pika_viewable_get_children (PIKA_VIEWABLE (parent)),
FALSE);
g_return_val_if_fail (ret_vectors == NULL || *ret_vectors == NULL, FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
return pika_vectors_import (image, file, NULL, 0, merge, scale,
parent, position,
ret_vectors, error);
}
/**
* pika_vectors_import_string:
* @image: the #PikaImage to add the paths to
* @buffer: a character buffer to parse
* @len: number of bytes in @str or -1 if @str is %NUL-terminated
* @merge: should multiple paths be merged into a single #PikaVectors object
* @scale: should the SVG be scaled to fit the image dimensions
* @error: location to store possible errors
*
* Imports one or more paths and basic shapes from a SVG file.
*
* Returns: %TRUE on success, %FALSE if an error occurred
**/
gboolean
pika_vectors_import_buffer (PikaImage *image,
const gchar *buffer,
gsize len,
gboolean merge,
gboolean scale,
PikaVectors *parent,
gint position,
GList **ret_vectors,
GError **error)
{
g_return_val_if_fail (PIKA_IS_IMAGE (image), FALSE);
g_return_val_if_fail (buffer != NULL || len == 0, FALSE);
g_return_val_if_fail (parent == NULL ||
parent == PIKA_IMAGE_ACTIVE_PARENT ||
PIKA_IS_VECTORS (parent), FALSE);
g_return_val_if_fail (parent == NULL ||
parent == PIKA_IMAGE_ACTIVE_PARENT ||
pika_item_is_attached (PIKA_ITEM (parent)), FALSE);
g_return_val_if_fail (parent == NULL ||
parent == PIKA_IMAGE_ACTIVE_PARENT ||
pika_item_get_image (PIKA_ITEM (parent)) == image,
FALSE);
g_return_val_if_fail (parent == NULL ||
parent == PIKA_IMAGE_ACTIVE_PARENT ||
pika_viewable_get_children (PIKA_VIEWABLE (parent)),
FALSE);
g_return_val_if_fail (ret_vectors == NULL || *ret_vectors == NULL, FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
return pika_vectors_import (image, NULL, buffer, len, merge, scale,
parent, position,
ret_vectors, error);
}
static gboolean
pika_vectors_import (PikaImage *image,
GFile *file,
const gchar *str,
gsize len,
gboolean merge,
gboolean scale,
PikaVectors *parent,
gint position,
GList **ret_vectors,
GError **error)
{
PikaXmlParser *xml_parser;
SvgParser parser;
GList *paths;
SvgHandler *base;
gboolean success = TRUE;
parser.stack = g_queue_new ();
parser.image = image;
parser.scale = scale;
parser.svg_depth = 0;
/* the base of the stack, defines the size of the view-port */
base = g_slice_new0 (SvgHandler);
base->name = "image";
base->width = pika_image_get_width (image);
base->height = pika_image_get_height (image);
g_queue_push_head (parser.stack, base);
xml_parser = pika_xml_parser_new (&markup_parser, &parser);
if (file)
success = pika_xml_parser_parse_gfile (xml_parser, file, error);
else
success = pika_xml_parser_parse_buffer (xml_parser, str, len, error);
pika_xml_parser_free (xml_parser);
if (success)
{
if (base->paths)
{
PikaVectors *vectors = NULL;
base->paths = g_list_reverse (base->paths);
merge = merge && base->paths->next;
pika_image_undo_group_start (image, PIKA_UNDO_GROUP_VECTORS_IMPORT,
_("Import Paths"));
for (paths = base->paths; paths; paths = paths->next)
{
SvgPath *path = paths->data;
GList *list;
if (! merge || ! vectors)
{
vectors = pika_vectors_new (image,
((merge || ! path->id) ?
_("Imported Path") : path->id));
pika_image_add_vectors (image, vectors,
parent, position, TRUE);
pika_vectors_freeze (vectors);
if (ret_vectors)
*ret_vectors = g_list_prepend (*ret_vectors, vectors);
if (position != -1)
position++;
}
for (list = path->strokes; list; list = list->next)
pika_vectors_stroke_add (vectors, PIKA_STROKE (list->data));
if (! merge)
pika_vectors_thaw (vectors);
g_list_free_full (path->strokes, g_object_unref);
path->strokes = NULL;
}
if (merge)
pika_vectors_thaw (vectors);
pika_image_undo_group_end (image);
}
else
{
if (file)
g_set_error (error, PIKA_ERROR, PIKA_FAILED,
_("No paths found in '%s'"),
pika_file_get_utf8_name (file));
else
g_set_error_literal (error, PIKA_ERROR, PIKA_FAILED,
_("No paths found in the buffer"));
success = FALSE;
}
}
else if (error && *error && file) /* parser reported an error */
{
gchar *msg = (*error)->message;
(*error)->message =
g_strdup_printf (_("Failed to import paths from '%s': %s"),
pika_file_get_utf8_name (file), msg);
g_free (msg);
}
while ((base = g_queue_pop_head (parser.stack)) != NULL)
{
for (paths = base->paths; paths; paths = paths->next)
{
SvgPath *path = paths->data;
GList *list;
g_free (path->id);
for (list = path->strokes; list; list = list->next)
g_object_unref (list->data);
g_list_free (path->strokes);
g_slice_free (SvgPath, path);
}
g_list_free (base->paths);
g_slice_free (PikaMatrix3, base->transform);
g_slice_free (SvgHandler, base);
}
g_queue_free (parser.stack);
return success;
}
static void
svg_parser_start_element (GMarkupParseContext *context,
const gchar *element_name,
const gchar **attribute_names,
const gchar **attribute_values,
gpointer user_data,
GError **error)
{
SvgParser *parser = user_data;
SvgHandler *handler;
SvgHandler *base;
gint i = 0;
handler = g_slice_new0 (SvgHandler);
base = g_queue_peek_head (parser->stack);
/* if the element is not rendered, always use the generic handler */
if (base->width <= 0.0 || base->height <= 0.0)
i = G_N_ELEMENTS (svg_handlers);
for (; i < G_N_ELEMENTS (svg_handlers); i++)
if (strcmp (svg_handlers[i].name, element_name) == 0)
{
handler->name = svg_handlers[i].name;
handler->start = svg_handlers[i].start;
break;
}
handler->width = base->width;
handler->height = base->height;
g_queue_push_head (parser->stack, handler);
if (handler->start)
handler->start (handler, attribute_names, attribute_values, parser);
}
static void
svg_parser_end_element (GMarkupParseContext *context,
const gchar *element_name,
gpointer user_data,
GError **error)
{
SvgParser *parser = user_data;
SvgHandler *handler;
SvgHandler *base;
GList *paths;
handler = g_queue_pop_head (parser->stack);
g_return_if_fail (handler != NULL &&
(handler->name == NULL ||
strcmp (handler->name, element_name) == 0));
if (handler->end)
handler->end (handler, parser);
if (handler->paths)
{
if (handler->transform)
{
for (paths = handler->paths; paths; paths = paths->next)
{
SvgPath *path = paths->data;
GList *list;
for (list = path->strokes; list; list = list->next)
pika_stroke_transform (PIKA_STROKE (list->data),
handler->transform, NULL);
}
g_slice_free (PikaMatrix3, handler->transform);
}
base = g_queue_peek_head (parser->stack);
base->paths = g_list_concat (base->paths, handler->paths);
}
g_slice_free (SvgHandler, handler);
}
static void
svg_handler_svg_start (SvgHandler *handler,
const gchar **names,
const gchar **values,
SvgParser *parser)
{
PikaMatrix3 *matrix;
PikaMatrix3 box;
const gchar *viewbox = NULL;
gdouble x = 0;
gdouble y = 0;
gdouble w = handler->width;
gdouble h = handler->height;
gdouble xres;
gdouble yres;
matrix = g_slice_new (PikaMatrix3);
pika_matrix3_identity (matrix);
pika_image_get_resolution (parser->image, &xres, &yres);
while (*names)
{
switch (*names[0])
{
case 'x':
if (strcmp (*names, "x") == 0)
parse_svg_length (*values, handler->width, xres, &x);
break;
case 'y':
if (strcmp (*names, "y") == 0)
parse_svg_length (*values, handler->height, yres, &y);
break;
case 'w':
if (strcmp (*names, "width") == 0)
parse_svg_length (*values, handler->width, xres, &w);
break;
case 'h':
if (strcmp (*names, "height") == 0)
parse_svg_length (*values, handler->height, yres, &h);
break;
case 'v':
if (strcmp (*names, "viewBox") == 0)
viewbox = *values;
break;
}
names++;
values++;
}
if (x || y)
{
/* according to the spec offsets are meaningless on the outermost svg */
if (parser->svg_depth > 0)
pika_matrix3_translate (matrix, x, y);
}
if (viewbox && parse_svg_viewbox (viewbox, &w, &h, &box))
{
pika_matrix3_mult (&box, matrix);
}
/* optionally scale the outermost svg to image size */
if (parser->scale && parser->svg_depth == 0)
{
if (w > 0.0 && h > 0.0)
pika_matrix3_scale (matrix,
pika_image_get_width (parser->image) / w,
pika_image_get_height (parser->image) / h);
}
handler->width = w;
handler->height = h;
handler->transform = matrix;
parser->svg_depth++;
}
static void
svg_handler_svg_end (SvgHandler *handler,
SvgParser *parser)
{
parser->svg_depth--;
}
static void
svg_handler_group_start (SvgHandler *handler,
const gchar **names,
const gchar **values,
SvgParser *parser)
{
while (*names)
{
if (strcmp (*names, "transform") == 0 && ! handler->transform)
{
PikaMatrix3 matrix;
if (parse_svg_transform (*values, &matrix))
{
handler->transform = g_slice_dup (PikaMatrix3, &matrix);
#ifdef DEBUG_VECTORS_IMPORT
g_printerr ("transform %s: %g %g %g %g %g %g %g %g %g\n",
handler->id ? handler->id : "(null)",
handler->transform->coeff[0][0],
handler->transform->coeff[0][1],
handler->transform->coeff[0][2],
handler->transform->coeff[1][0],
handler->transform->coeff[1][1],
handler->transform->coeff[1][2],
handler->transform->coeff[2][0],
handler->transform->coeff[2][1],
handler->transform->coeff[2][2]);
#endif
}
}
names++;
values++;
}
}
static void
svg_handler_path_start (SvgHandler *handler,
const gchar **names,
const gchar **values,
SvgParser *parser)
{
SvgPath *path = g_slice_new0 (SvgPath);
while (*names)
{
switch (*names[0])
{
case 'i':
if (strcmp (*names, "id") == 0 && ! path->id)
path->id = g_strdup (*values);
break;
case 'd':
if (strcmp (*names, "d") == 0 && ! path->strokes)
path->strokes = parse_path_data (*values);
break;
case 't':
if (strcmp (*names, "transform") == 0 && ! handler->transform)
{
PikaMatrix3 matrix;
if (parse_svg_transform (*values, &matrix))
{
handler->transform = g_slice_dup (PikaMatrix3, &matrix);
}
}
break;
}
names++;
values++;
}
handler->paths = g_list_prepend (handler->paths, path);
}
static void
svg_handler_rect_start (SvgHandler *handler,
const gchar **names,
const gchar **values,
SvgParser *parser)
{
SvgPath *path = g_slice_new0 (SvgPath);
gdouble x = 0.0;
gdouble y = 0.0;
gdouble width = 0.0;
gdouble height = 0.0;
gdouble rx = 0.0;
gdouble ry = 0.0;
gdouble xres;
gdouble yres;
pika_image_get_resolution (parser->image, &xres, &yres);
while (*names)
{
switch (*names[0])
{
case 'i':
if (strcmp (*names, "id") == 0 && ! path->id)
path->id = g_strdup (*values);
break;
case 'x':
if (strcmp (*names, "x") == 0)
parse_svg_length (*values, handler->width, xres, &x);
break;
case 'y':
if (strcmp (*names, "y") == 0)
parse_svg_length (*values, handler->height, yres, &y);
break;
case 'w':
if (strcmp (*names, "width") == 0)
parse_svg_length (*values, handler->width, xres, &width);
break;
case 'h':
if (strcmp (*names, "height") == 0)
parse_svg_length (*values, handler->height, yres, &height);
break;
case 'r':
if (strcmp (*names, "rx") == 0)
parse_svg_length (*values, handler->width, xres, &rx);
else if (strcmp (*names, "ry") == 0)
parse_svg_length (*values, handler->height, yres, &ry);
break;
case 't':
if (strcmp (*names, "transform") == 0 && ! handler->transform)
{
PikaMatrix3 matrix;
if (parse_svg_transform (*values, &matrix))
{
handler->transform = g_slice_dup (PikaMatrix3, &matrix);
}
}
break;
}
names++;
values++;
}
if (width > 0.0 && height > 0.0 && rx >= 0.0 && ry >= 0.0)
{
PikaStroke *stroke;
PikaCoords point = COORDS_INIT;
if (rx == 0.0)
rx = ry;
if (ry == 0.0)
ry = rx;
rx = MIN (rx, width / 2);
ry = MIN (ry, height / 2);
point.x = x + width - rx;
point.y = y;
stroke = pika_bezier_stroke_new_moveto (&point);
if (rx)
{
PikaCoords end = COORDS_INIT;
end.x = x + width;
end.y = y + ry;
pika_bezier_stroke_arcto (stroke, rx, ry, 0, FALSE, TRUE, &end);
}
point.x = x + width;
point.y = y + height - ry;
pika_bezier_stroke_lineto (stroke, &point);
if (rx)
{
PikaCoords end = COORDS_INIT;
end.x = x + width - rx;
end.y = y + height;
pika_bezier_stroke_arcto (stroke, rx, ry, 0, FALSE, TRUE, &end);
}
point.x = x + rx;
point.y = y + height;
pika_bezier_stroke_lineto (stroke, &point);
if (rx)
{
PikaCoords end = COORDS_INIT;
end.x = x;
end.y = y + height - ry;
pika_bezier_stroke_arcto (stroke, rx, ry, 0, FALSE, TRUE, &end);
}
point.x = x;
point.y = y + ry;
pika_bezier_stroke_lineto (stroke, &point);
if (rx)
{
PikaCoords end = COORDS_INIT;
end.x = x + rx;
end.y = y;
pika_bezier_stroke_arcto (stroke, rx, ry, 0, FALSE, TRUE, &end);
}
/* the last line is handled by closing the stroke */
pika_stroke_close (stroke);
path->strokes = g_list_prepend (path->strokes, stroke);
}
handler->paths = g_list_prepend (handler->paths, path);
}
static void
svg_handler_ellipse_start (SvgHandler *handler,
const gchar **names,
const gchar **values,
SvgParser *parser)
{
SvgPath *path = g_slice_new0 (SvgPath);
PikaCoords center = COORDS_INIT;
gdouble rx = 0.0;
gdouble ry = 0.0;
gdouble xres;
gdouble yres;
pika_image_get_resolution (parser->image, &xres, &yres);
while (*names)
{
switch (*names[0])
{
case 'i':
if (strcmp (*names, "id") == 0 && ! path->id)
path->id = g_strdup (*values);
break;
case 'c':
if (strcmp (*names, "cx") == 0)
parse_svg_length (*values, handler->width, xres, &center.x);
else if (strcmp (*names, "cy") == 0)
parse_svg_length (*values, handler->height, yres, &center.y);
break;
case 'r':
if (strcmp (*names, "r") == 0)
{
parse_svg_length (*values, handler->width, xres, &rx);
parse_svg_length (*values, handler->height, yres, &ry);
}
else if (strcmp (*names, "rx") == 0)
{
parse_svg_length (*values, handler->width, xres, &rx);
}
else if (strcmp (*names, "ry") == 0)
{
parse_svg_length (*values, handler->height, yres, &ry);
}
break;
case 't':
if (strcmp (*names, "transform") == 0 && ! handler->transform)
{
PikaMatrix3 matrix;
if (parse_svg_transform (*values, &matrix))
{
handler->transform = g_slice_dup (PikaMatrix3, &matrix);
}
}
break;
}
names++;
values++;
}
if (rx >= 0.0 && ry >= 0.0)
path->strokes = g_list_prepend (path->strokes,
pika_bezier_stroke_new_ellipse (&center,
rx, ry,
0.0));
handler->paths = g_list_prepend (handler->paths, path);
}
static void
svg_handler_line_start (SvgHandler *handler,
const gchar **names,
const gchar **values,
SvgParser *parser)
{
SvgPath *path = g_slice_new0 (SvgPath);
PikaCoords start = COORDS_INIT;
PikaCoords end = COORDS_INIT;
PikaStroke *stroke;
gdouble xres;
gdouble yres;
pika_image_get_resolution (parser->image, &xres, &yres);
while (*names)
{
switch (*names[0])
{
case 'i':
if (strcmp (*names, "id") == 0 && ! path->id)
path->id = g_strdup (*values);
break;
case 'x':
if (strcmp (*names, "x1") == 0)
parse_svg_length (*values, handler->width, xres, &start.x);
else if (strcmp (*names, "x2") == 0)
parse_svg_length (*values, handler->width, xres, &end.x);
break;
case 'y':
if (strcmp (*names, "y1") == 0)
parse_svg_length (*values, handler->height, yres, &start.y);
else if (strcmp (*names, "y2") == 0)
parse_svg_length (*values, handler->height, yres, &end.y);
break;
case 't':
if (strcmp (*names, "transform") == 0 && ! handler->transform)
{
PikaMatrix3 matrix;
if (parse_svg_transform (*values, &matrix))
{
handler->transform = g_slice_dup (PikaMatrix3, &matrix);
}
}
break;
}
names++;
values++;
}
stroke = pika_bezier_stroke_new_moveto (&start);
pika_bezier_stroke_lineto (stroke, &end);
path->strokes = g_list_prepend (path->strokes, stroke);
handler->paths = g_list_prepend (handler->paths, path);
}
static void
svg_handler_poly_start (SvgHandler *handler,
const gchar **names,
const gchar **values,
SvgParser *parser)
{
SvgPath *path = g_slice_new0 (SvgPath);
GString *points = NULL;
while (*names)
{
switch (*names[0])
{
case 'i':
if (strcmp (*names, "id") == 0 && ! path->id)
path->id = g_strdup (*values);
break;
case 'p':
if (strcmp (*names, "points") == 0 && ! points)
{
const gchar *p = *values;
const gchar *m = NULL;
const gchar *l = NULL;
gint n = 0;
while (*p)
{
while (g_ascii_isspace (*p) || *p == ',')
p++;
switch (n)
{
case 0:
m = p;
break;
case 2:
l = p;
break;
}
if (*p)
n++;
while (*p && ! g_ascii_isspace (*p) && *p != ',')
p++;
}
if ((n > 3) && (n % 2 == 0))
{
points = g_string_sized_new (p - *values + 8);
g_string_append_len (points, "M ", 2);
g_string_append_len (points, m, l - m);
g_string_append_len (points, "L ", 2);
g_string_append_len (points, l, p - l);
if (strcmp (handler->name, "polygon") == 0)
g_string_append_c (points, 'Z');
}
}
break;
case 't':
if (strcmp (*names, "transform") == 0 && ! handler->transform)
{
PikaMatrix3 matrix;
if (parse_svg_transform (*values, &matrix))
{
handler->transform = g_slice_dup (PikaMatrix3, &matrix);
}
}
break;
}
names++;
values++;
}
if (points)
{
path->strokes = parse_path_data (points->str);
g_string_free (points, TRUE);
}
handler->paths = g_list_prepend (handler->paths, path);
}
static gboolean
parse_svg_length (const gchar *value,
gdouble reference,
gdouble resolution,
gdouble *length)
{
PikaUnit unit = PIKA_UNIT_PIXEL;
gdouble len;
gchar *ptr;
len = g_ascii_strtod (value, &ptr);
while (g_ascii_isspace (*ptr))
ptr++;
switch (ptr[0])
{
case '\0':
break;
case 'p':
switch (ptr[1])
{
case 'x': break;
case 't': unit = PIKA_UNIT_POINT; break;
case 'c': unit = PIKA_UNIT_PICA; break;
default:
return FALSE;
}
ptr += 2;
break;
case 'c':
if (ptr[1] == 'm')
len *= 10.0, unit = PIKA_UNIT_MM;
else
return FALSE;
ptr += 2;
break;
case 'm':
if (ptr[1] == 'm')
unit = PIKA_UNIT_MM;
else
return FALSE;
ptr += 2;
break;
case 'i':
if (ptr[1] == 'n')
unit = PIKA_UNIT_INCH;
else
return FALSE;
ptr += 2;
break;
case '%':
unit = PIKA_UNIT_PERCENT;
ptr += 1;
break;
default:
return FALSE;
}
while (g_ascii_isspace (*ptr))
ptr++;
if (*ptr)
return FALSE;
switch (unit)
{
case PIKA_UNIT_PERCENT:
*length = len * reference / 100.0;
break;
case PIKA_UNIT_PIXEL:
*length = len;
break;
default:
*length = len * resolution / pika_unit_get_factor (unit);
break;
}
return TRUE;
}
static gboolean
parse_svg_viewbox (const gchar *value,
gdouble *width,
gdouble *height,
PikaMatrix3 *matrix)
{
gdouble x, y, w, h;
gchar *tok;
gchar *str = g_strdup (value);
gboolean success = FALSE;
x = y = w = h = 0;
tok = strtok (str, ", \t");
if (tok)
{
x = g_ascii_strtod (tok, NULL);
tok = strtok (NULL, ", \t");
if (tok)
{
y = g_ascii_strtod (tok, NULL);
tok = strtok (NULL, ", \t");
if (tok != NULL)
{
w = g_ascii_strtod (tok, NULL);
tok = strtok (NULL, ", \t");
if (tok)
{
h = g_ascii_strtod (tok, NULL);
success = TRUE;
}
}
}
}
g_free (str);
if (success)
{
pika_matrix3_identity (matrix);
pika_matrix3_translate (matrix, -x, -y);
if (w > 0.0 && h > 0.0)
{
pika_matrix3_scale (matrix, *width / w, *height / h);
}
else /* disable rendering of the element */
{
#ifdef DEBUG_VECTORS_IMPORT
g_printerr ("empty viewBox");
#endif
*width = *height = 0.0;
}
}
else
{
g_printerr ("SVG import: cannot parse viewBox attribute\n");
}
return success;
}
static gboolean
parse_svg_transform (const gchar *value,
PikaMatrix3 *matrix)
{
gint i;
pika_matrix3_identity (matrix);
for (i = 0; value[i]; i++)
{
PikaMatrix3 trafo;
gchar keyword[32];
gdouble args[6];
gint n_args;
gint key_len;
pika_matrix3_identity (&trafo);
/* skip initial whitespace */
while (g_ascii_isspace (value[i]))
i++;
/* parse keyword */
for (key_len = 0; key_len < sizeof (keyword); key_len++)
{
gchar c = value[i];
if (g_ascii_isalpha (c) || c == '-')
keyword[key_len] = value[i++];
else
break;
}
if (key_len >= sizeof (keyword))
return FALSE;
keyword[key_len] = '\0';
/* skip whitespace */
while (g_ascii_isspace (value[i]))
i++;
if (value[i] != '(')
return FALSE;
i++;
for (n_args = 0; ; n_args++)
{
gchar c;
gchar *end_ptr;
/* skip whitespace */
while (g_ascii_isspace (value[i]))
i++;
c = value[i];
if (g_ascii_isdigit (c) || c == '+' || c == '-' || c == '.')
{
if (n_args == G_N_ELEMENTS (args))
return FALSE; /* too many args */
args[n_args] = g_ascii_strtod (value + i, &end_ptr);
i = end_ptr - value;
while (g_ascii_isspace (value[i]))
i++;
/* skip optional comma */
if (value[i] == ',')
i++;
}
else if (c == ')')
break;
else
return FALSE;
}
/* OK, have parsed keyword and args, now calculate the transform matrix */
if (strcmp (keyword, "matrix") == 0)
{
if (n_args != 6)
return FALSE;
pika_matrix3_affine (&trafo,
args[0], args[1],
args[2], args[3],
args[4], args[5]);
}
else if (strcmp (keyword, "translate") == 0)
{
if (n_args == 1)
args[1] = 0.0;
else if (n_args != 2)
return FALSE;
pika_matrix3_translate (&trafo, args[0], args[1]);
}
else if (strcmp (keyword, "scale") == 0)
{
if (n_args == 1)
args[1] = args[0];
else if (n_args != 2)
return FALSE;
pika_matrix3_scale (&trafo, args[0], args[1]);
}
else if (strcmp (keyword, "rotate") == 0)
{
if (n_args == 1)
{
pika_matrix3_rotate (&trafo, pika_deg_to_rad (args[0]));
}
else if (n_args == 3)
{
pika_matrix3_translate (&trafo, -args[1], -args[2]);
pika_matrix3_rotate (&trafo, pika_deg_to_rad (args[0]));
pika_matrix3_translate (&trafo, args[1], args[2]);
}
else
return FALSE;
}
else if (strcmp (keyword, "skewX") == 0)
{
if (n_args != 1)
return FALSE;
pika_matrix3_xshear (&trafo, tan (pika_deg_to_rad (args[0])));
}
else if (strcmp (keyword, "skewY") == 0)
{
if (n_args != 1)
return FALSE;
pika_matrix3_yshear (&trafo, tan (pika_deg_to_rad (args[0])));
}
else
{
return FALSE; /* unknown keyword */
}
pika_matrix3_invert (&trafo);
pika_matrix3_mult (&trafo, matrix);
}
pika_matrix3_invert (matrix);
return TRUE;
}
/**********************************************************/
/* Below is the code that parses the actual path data. */
/* */
/* This code is taken from librsvg and was originally */
/* written by Raph Levien <raph@artofcode.com> for Gill. */
/**********************************************************/
typedef struct
{
GList *strokes;
PikaStroke *stroke;
gdouble cpx, cpy; /* current point */
gdouble rpx, rpy; /* reflection point (for 's' and 't' commands) */
gchar cmd; /* current command (lowercase) */
gint param; /* number of parameters */
gboolean rel; /* true if relative coords */
gdouble params[7]; /* parameters that have been parsed */
} ParsePathContext;
static void parse_path_default_xy (ParsePathContext *ctx,
gint n_params);
static void parse_path_do_cmd (ParsePathContext *ctx,
gboolean final);
static GList *
parse_path_data (const gchar *data)
{
ParsePathContext ctx;
gboolean in_num = FALSE;
gboolean in_frac = FALSE;
gboolean in_exp = FALSE;
gboolean exp_wait_sign = FALSE;
gdouble val = 0.0;
gchar c = 0;
gint sign = 0;
gint exp = 0;
gint exp_sign = 0;
gdouble frac = 0.0;
gint i;
memset (&ctx, 0, sizeof (ParsePathContext));
for (i = 0; ; i++)
{
c = data[i];
if (c >= '0' && c <= '9')
{
/* digit */
if (in_num)
{
if (in_exp)
{
exp = (exp * 10) + c - '0';
exp_wait_sign = FALSE;
}
else if (in_frac)
val += (frac *= 0.1) * (c - '0');
else
val = (val * 10) + c - '0';
}
else
{
in_num = TRUE;
in_frac = FALSE;
in_exp = FALSE;
exp = 0;
exp_sign = 1;
exp_wait_sign = FALSE;
val = c - '0';
sign = 1;
}
}
else if (c == '.')
{
if (! in_num)
{
in_num = TRUE;
val = 0;
}
in_frac = TRUE;
frac = 1;
}
else if ((c == 'E' || c == 'e') && in_num)
{
in_exp = TRUE;
exp_wait_sign = TRUE;
exp = 0;
exp_sign = 1;
}
else if ((c == '+' || c == '-') && in_exp)
{
exp_sign = c == '+' ? 1 : -1;
}
else if (in_num)
{
/* end of number */
val *= sign * pow (10, exp_sign * exp);
if (ctx.rel)
{
/* Handle relative coordinates. This switch statement attempts
to determine _what_ the coords are relative to. This is
underspecified in the 12 Apr working draft. */
switch (ctx.cmd)
{
case 'l':
case 'm':
case 'c':
case 's':
case 'q':
case 't':
/* rule: even-numbered params are x-relative, odd-numbered
are y-relative */
if ((ctx.param & 1) == 0)
val += ctx.cpx;
else if ((ctx.param & 1) == 1)
val += ctx.cpy;
break;
case 'a':
/* rule: sixth and seventh are x and y, rest are not
relative */
if (ctx.param == 5)
val += ctx.cpx;
else if (ctx.param == 6)
val += ctx.cpy;
break;
case 'h':
/* rule: x-relative */
val += ctx.cpx;
break;
case 'v':
/* rule: y-relative */
val += ctx.cpy;
break;
}
}
ctx.params[ctx.param++] = val;
parse_path_do_cmd (&ctx, FALSE);
in_num = FALSE;
}
if (c == '\0')
{
break;
}
else if ((c == '+' || c == '-') && ! exp_wait_sign)
{
sign = c == '+' ? 1 : -1;
val = 0;
in_num = TRUE;
in_frac = FALSE;
in_exp = FALSE;
exp = 0;
exp_sign = 1;
exp_wait_sign = FALSE;
}
else if (c == 'z' || c == 'Z')
{
if (ctx.param)
parse_path_do_cmd (&ctx, TRUE);
if (ctx.stroke)
pika_stroke_close (ctx.stroke);
}
else if (c >= 'A' && c <= 'Z' && c != 'E')
{
if (ctx.param)
parse_path_do_cmd (&ctx, TRUE);
ctx.cmd = c + 'a' - 'A';
ctx.rel = FALSE;
}
else if (c >= 'a' && c <= 'z' && c != 'e')
{
if (ctx.param)
parse_path_do_cmd (&ctx, TRUE);
ctx.cmd = c;
ctx.rel = TRUE;
}
/* else c _should_ be whitespace or , */
}
return g_list_reverse (ctx.strokes);
}
/* supply defaults for missing parameters, assuming relative coordinates
are to be interpreted as x,y */
static void
parse_path_default_xy (ParsePathContext *ctx,
gint n_params)
{
gint i;
if (ctx->rel)
{
for (i = ctx->param; i < n_params; i++)
{
if (i > 2)
ctx->params[i] = ctx->params[i - 2];
else if (i == 1)
ctx->params[i] = ctx->cpy;
else if (i == 0)
/* we shouldn't get here (ctx->param > 0 as precondition) */
ctx->params[i] = ctx->cpx;
}
}
else
{
for (i = ctx->param; i < n_params; i++)
ctx->params[i] = 0.0;
}
}
static void
parse_path_do_cmd (ParsePathContext *ctx,
gboolean final)
{
PikaCoords coords = COORDS_INIT;
switch (ctx->cmd)
{
case 'm':
/* moveto */
if (ctx->param == 2 || final)
{
parse_path_default_xy (ctx, 2);
coords.x = ctx->cpx = ctx->rpx = ctx->params[0];
coords.y = ctx->cpy = ctx->rpy = ctx->params[1];
ctx->stroke = pika_bezier_stroke_new_moveto (&coords);
ctx->strokes = g_list_prepend (ctx->strokes, ctx->stroke);
ctx->param = 0;
/* If a moveto is followed by multiple pairs of coordinates,
* the subsequent pairs are treated as implicit lineto commands.
*/
ctx->cmd = 'l';
}
break;
case 'l':
/* lineto */
if (ctx->param == 2 || final)
{
parse_path_default_xy (ctx, 2);
coords.x = ctx->cpx = ctx->rpx = ctx->params[0];
coords.y = ctx->cpy = ctx->rpy = ctx->params[1];
pika_bezier_stroke_lineto (ctx->stroke, &coords);
ctx->param = 0;
}
break;
case 'c':
/* curveto */
if (ctx->param == 6 || final)
{
PikaCoords ctrl1 = COORDS_INIT;
PikaCoords ctrl2 = COORDS_INIT;
parse_path_default_xy (ctx, 6);
ctrl1.x = ctx->params[0];
ctrl1.y = ctx->params[1];
ctrl2.x = ctx->rpx = ctx->params[2];
ctrl2.y = ctx->rpy = ctx->params[3];
coords.x = ctx->cpx = ctx->params[4];
coords.y = ctx->cpy = ctx->params[5];
pika_bezier_stroke_cubicto (ctx->stroke, &ctrl1, &ctrl2, &coords);
ctx->param = 0;
}
break;
case 's':
/* smooth curveto */
if (ctx->param == 4 || final)
{
PikaCoords ctrl1 = COORDS_INIT;
PikaCoords ctrl2 = COORDS_INIT;
parse_path_default_xy (ctx, 4);
ctrl1.x = 2 * ctx->cpx - ctx->rpx;
ctrl1.y = 2 * ctx->cpy - ctx->rpy;
ctrl2.x = ctx->rpx = ctx->params[0];
ctrl2.y = ctx->rpy = ctx->params[1];
coords.x = ctx->cpx = ctx->params[2];
coords.y = ctx->cpy = ctx->params[3];
pika_bezier_stroke_cubicto (ctx->stroke, &ctrl1, &ctrl2, &coords);
ctx->param = 0;
}
break;
case 'h':
/* horizontal lineto */
if (ctx->param == 1)
{
coords.x = ctx->cpx = ctx->rpx = ctx->params[0];
coords.y = ctx->cpy;
pika_bezier_stroke_lineto (ctx->stroke, &coords);
ctx->param = 0;
}
break;
case 'v':
/* vertical lineto */
if (ctx->param == 1)
{
coords.x = ctx->cpx;
coords.y = ctx->cpy = ctx->rpy = ctx->params[0];
pika_bezier_stroke_lineto (ctx->stroke, &coords);
ctx->param = 0;
}
break;
case 'q':
/* quadratic bezier curveto */
if (ctx->param == 4 || final)
{
PikaCoords ctrl = COORDS_INIT;
parse_path_default_xy (ctx, 4);
ctrl.x = ctx->rpx = ctx->params[0];
ctrl.y = ctx->rpy = ctx->params[1];
coords.x = ctx->cpx = ctx->params[2];
coords.y = ctx->cpy = ctx->params[3];
pika_bezier_stroke_conicto (ctx->stroke, &ctrl, &coords);
ctx->param = 0;
}
break;
case 't':
/* truetype quadratic bezier curveto */
if (ctx->param == 2 || final)
{
PikaCoords ctrl = COORDS_INIT;
parse_path_default_xy (ctx, 2);
ctrl.x = ctx->rpx = 2 * ctx->cpx - ctx->rpx;
ctrl.y = ctx->rpy = 2 * ctx->cpy - ctx->rpy;
coords.x = ctx->cpx = ctx->params[0];
coords.y = ctx->cpy = ctx->params[1];
pika_bezier_stroke_conicto (ctx->stroke, &ctrl, &coords);
ctx->param = 0;
}
else if (final)
{
if (ctx->param > 2)
{
PikaCoords ctrl = COORDS_INIT;
parse_path_default_xy (ctx, 4);
ctrl.x = ctx->rpx = ctx->params[0];
ctrl.y = ctx->rpy = ctx->params[1];
coords.x = ctx->cpx = ctx->params[2];
coords.y = ctx->cpy = ctx->params[3];
pika_bezier_stroke_conicto (ctx->stroke, &ctrl, &coords);
}
else
{
parse_path_default_xy (ctx, 2);
coords.x = ctx->cpx = ctx->rpx = ctx->params[0];
coords.y = ctx->cpy = ctx->rpy = ctx->params[1];
pika_bezier_stroke_lineto (ctx->stroke, &coords);
}
ctx->param = 0;
}
break;
case 'a':
if (ctx->param == 7 || final)
{
coords.x = ctx->cpx = ctx->rpx = ctx->params[5];
coords.y = ctx->cpy = ctx->rpy = ctx->params[6];
pika_bezier_stroke_arcto (ctx->stroke,
ctx->params[0], ctx->params[1],
pika_deg_to_rad (ctx->params[2]),
ctx->params[3], ctx->params[4],
&coords);
ctx->param = 0;
}
break;
default:
ctx->param = 0;
break;
}
}
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