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livetrax/libs/gnomecanvas/libgnomecanvas/gnome-canvas-shape.c
Paul Davis bb592809f1 merge gnomecanvas into ardour tree, so that we can fix our own bugs and not wait for silly gnome release schedules 
git-svn-id: svn://localhost/ardour2/branches/3.0@8114 d708f5d6-7413-0410-9779-e7cbd77b26cf
2010-11-27 23:16:42 +00:00

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/* Generic bezier shape item for GnomeCanvasWidget. Most code taken
* from gnome-canvas-bpath but made into a shape item.
*
* GnomeCanvas is basically a port of the Tk toolkit's most excellent
* canvas widget. Tk is copyrighted by the Regents of the University
* of California, Sun Microsystems, and other parties.
*
* Copyright (C) 1998,1999 The Free Software Foundation
*
* Authors: Federico Mena <federico@nuclecu.unam.mx>
* Raph Levien <raph@acm.org>
* Lauris Kaplinski <lauris@ximian.com>
* Miguel de Icaza <miguel@kernel.org>
* Cody Russell <bratsche@gnome.org>
* Rusty Conover <rconover@bangtail.net>
*/
/* These includes are set up for standalone compile. If/when this codebase
is integrated into libgnomeui, the includes will need to change. */
#include <math.h>
#include <string.h>
#include <gtk/gtk.h>
#include "gnome-canvas.h"
#include "gnome-canvas-util.h"
#include "gnome-canvas-shape.h"
#include "gnome-canvas-shape-private.h"
#include "gnome-canvas-path-def.h"
#include <libart_lgpl/art_rect.h>
#include <libart_lgpl/art_vpath.h>
#include <libart_lgpl/art_bpath.h>
#include <libart_lgpl/art_vpath_bpath.h>
#include <libart_lgpl/art_svp.h>
#include <libart_lgpl/art_svp_point.h>
#include <libart_lgpl/art_svp_vpath.h>
#include <libart_lgpl/art_vpath_dash.h>
#include <libart_lgpl/art_svp_wind.h>
#include <libart_lgpl/art_svp_intersect.h>
#include <libart_lgpl/art_rect_svp.h>
enum {
PROP_0,
PROP_FILL_COLOR,
PROP_FILL_COLOR_GDK,
PROP_FILL_COLOR_RGBA,
PROP_OUTLINE_COLOR,
PROP_OUTLINE_COLOR_GDK,
PROP_OUTLINE_COLOR_RGBA,
PROP_FILL_STIPPLE,
PROP_OUTLINE_STIPPLE,
PROP_WIDTH_PIXELS,
PROP_WIDTH_UNITS,
PROP_CAP_STYLE,
PROP_JOIN_STYLE,
PROP_WIND,
PROP_MITERLIMIT,
PROP_DASH
};
static void gnome_canvas_shape_class_init (GnomeCanvasShapeClass *class);
static void gnome_canvas_shape_init (GnomeCanvasShape *bpath);
static void gnome_canvas_shape_destroy (GtkObject *object);
static void gnome_canvas_shape_set_property (GObject *object,
guint param_id,
const GValue *value,
GParamSpec *pspec);
static void gnome_canvas_shape_get_property (GObject *object,
guint param_id,
GValue *value,
GParamSpec *pspec);
static void gnome_canvas_shape_update (GnomeCanvasItem *item, double *affine, ArtSVP *clip_path, int flags);
static void gnome_canvas_shape_realize (GnomeCanvasItem *item);
static void gnome_canvas_shape_unrealize (GnomeCanvasItem *item);
static void gnome_canvas_shape_draw (GnomeCanvasItem *item, GdkDrawable *drawable,
int x, int y, int width, int height);
static double gnome_canvas_shape_point (GnomeCanvasItem *item, double x, double y,
int cx, int cy, GnomeCanvasItem **actual_item);
static void gnome_canvas_shape_render (GnomeCanvasItem *item, GnomeCanvasBuf *buf);
static void gnome_canvas_shape_bounds (GnomeCanvasItem *item,
double *x1, double *y1, double *x2, double *y2);
static gulong get_pixel_from_rgba (GnomeCanvasItem *item, guint32 rgba_color);
static guint32 get_rgba_from_color (GdkColor * color);
static void set_gc_foreground (GdkGC *gc, gulong pixel);
static void gcbp_ensure_gdk (GnomeCanvasShape * bpath);
static void gcbp_destroy_gdk (GnomeCanvasShape * bpath);
static void set_stipple (GdkGC *gc, GdkBitmap **internal_stipple, GdkBitmap *stipple, int reconfigure);
static void gcbp_ensure_mask (GnomeCanvasShape * bpath, gint width, gint height);
static void gcbp_draw_ctx_unref (GCBPDrawCtx * ctx);
static GnomeCanvasItemClass *parent_class;
GType
gnome_canvas_shape_get_type (void)
{
static GType shape_type;
if (!shape_type) {
const GTypeInfo object_info = {
sizeof (GnomeCanvasShapeClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) gnome_canvas_shape_class_init,
(GClassFinalizeFunc) NULL,
NULL, /* class_data */
sizeof (GnomeCanvasShape),
0, /* n_preallocs */
(GInstanceInitFunc) gnome_canvas_shape_init,
NULL /* value_table */
};
shape_type = g_type_register_static (GNOME_TYPE_CANVAS_ITEM, "GnomeCanvasShape",
&object_info, 0);
}
return shape_type;
}
static void
gnome_canvas_shape_class_init (GnomeCanvasShapeClass *class)
{
GObjectClass *gobject_class;
GtkObjectClass *object_class;
GnomeCanvasItemClass *item_class;
gobject_class = (GObjectClass *) class;
object_class = (GtkObjectClass *) class;
item_class = (GnomeCanvasItemClass *) class;
parent_class = g_type_class_peek_parent (class);
/* when this gets checked into libgnomeui, change the
GTK_TYPE_POINTER to GTK_TYPE_GNOME_CANVAS_SHAPE, and add an
entry to gnome-boxed.defs */
gobject_class->set_property = gnome_canvas_shape_set_property;
gobject_class->get_property = gnome_canvas_shape_get_property;
g_object_class_install_property (gobject_class,
PROP_FILL_COLOR,
g_param_spec_string ("fill_color", NULL, NULL,
NULL,
(G_PARAM_WRITABLE)));
g_object_class_install_property (gobject_class,
PROP_FILL_COLOR_GDK,
g_param_spec_boxed ("fill_color_gdk", NULL, NULL,
GDK_TYPE_COLOR,
(G_PARAM_READABLE | G_PARAM_WRITABLE)));
g_object_class_install_property (gobject_class,
PROP_FILL_COLOR_RGBA,
g_param_spec_uint ("fill_color_rgba", NULL, NULL,
0, G_MAXUINT, 0,
(G_PARAM_READABLE | G_PARAM_WRITABLE)));
g_object_class_install_property (gobject_class,
PROP_OUTLINE_COLOR,
g_param_spec_string ("outline_color", NULL, NULL,
NULL,
(G_PARAM_WRITABLE)));
g_object_class_install_property (gobject_class,
PROP_OUTLINE_COLOR_GDK,
g_param_spec_boxed ("outline_color_gdk", NULL, NULL,
GDK_TYPE_COLOR,
(G_PARAM_READABLE | G_PARAM_WRITABLE)));
g_object_class_install_property (gobject_class,
PROP_OUTLINE_COLOR_RGBA,
g_param_spec_uint ("outline_color_rgba", NULL, NULL,
0, G_MAXUINT, 0,
(G_PARAM_READABLE | G_PARAM_WRITABLE)));
g_object_class_install_property (gobject_class,
PROP_FILL_STIPPLE,
g_param_spec_object ("fill_stipple", NULL, NULL,
GDK_TYPE_DRAWABLE,
(G_PARAM_READABLE | G_PARAM_WRITABLE)));
g_object_class_install_property (gobject_class,
PROP_OUTLINE_STIPPLE,
g_param_spec_object ("outline_stipple", NULL, NULL,
GDK_TYPE_DRAWABLE,
(G_PARAM_READABLE | G_PARAM_WRITABLE)));
g_object_class_install_property (gobject_class,
PROP_WIDTH_PIXELS,
g_param_spec_uint ("width_pixels", NULL, NULL,
0, G_MAXUINT, 0,
(G_PARAM_READABLE | G_PARAM_WRITABLE)));
g_object_class_install_property (gobject_class,
PROP_WIDTH_UNITS,
g_param_spec_double ("width_units", NULL, NULL,
0.0, G_MAXDOUBLE, 0.0,
(G_PARAM_READABLE | G_PARAM_WRITABLE)));
g_object_class_install_property (gobject_class,
PROP_CAP_STYLE,
g_param_spec_enum ("cap_style", NULL, NULL,
GDK_TYPE_CAP_STYLE,
GDK_CAP_BUTT,
(G_PARAM_READABLE | G_PARAM_WRITABLE)));
g_object_class_install_property (gobject_class,
PROP_JOIN_STYLE,
g_param_spec_enum ("join_style", NULL, NULL,
GDK_TYPE_JOIN_STYLE,
GDK_JOIN_MITER,
(G_PARAM_READABLE | G_PARAM_WRITABLE)));
g_object_class_install_property (gobject_class,
PROP_WIND,
g_param_spec_uint ("wind", NULL, NULL,
0, G_MAXUINT, 0,
(G_PARAM_READABLE | G_PARAM_WRITABLE)));
g_object_class_install_property (gobject_class,
PROP_MITERLIMIT,
g_param_spec_double ("miterlimit", NULL, NULL,
0.0, G_MAXDOUBLE, 0.0,
(G_PARAM_READABLE | G_PARAM_WRITABLE)));
g_object_class_install_property (gobject_class,
PROP_DASH,
g_param_spec_pointer ("dash", NULL, NULL,
(G_PARAM_READABLE | G_PARAM_WRITABLE)));
object_class->destroy = gnome_canvas_shape_destroy;
item_class->update = gnome_canvas_shape_update;
item_class->realize = gnome_canvas_shape_realize;
item_class->unrealize = gnome_canvas_shape_unrealize;
item_class->draw = gnome_canvas_shape_draw;
item_class->point = gnome_canvas_shape_point;
item_class->render = gnome_canvas_shape_render;
item_class->bounds = gnome_canvas_shape_bounds;
}
static void
gnome_canvas_shape_init (GnomeCanvasShape *shape)
{
shape->priv = g_new (GnomeCanvasShapePriv, 1);
shape->priv->path = NULL;
shape->priv->scale = 1.0;
shape->priv->fill_set = FALSE;
shape->priv->outline_set = FALSE;
shape->priv->width_pixels = FALSE;
shape->priv->width = 1.0;
shape->priv->fill_rgba = 0x0000003f;
shape->priv->outline_rgba = 0x0000007f;
shape->priv->cap = GDK_CAP_BUTT;
shape->priv->join = GDK_JOIN_MITER;
shape->priv->wind = ART_WIND_RULE_ODDEVEN;
shape->priv->miterlimit = 10.43; /* X11 default */
shape->priv->dash.n_dash = 0;
shape->priv->dash.dash = NULL;
shape->priv->fill_svp = NULL;
shape->priv->outline_svp = NULL;
shape->priv->gdk = NULL;
}
static void
gnome_canvas_shape_destroy (GtkObject *object)
{
GnomeCanvasShape *shape;
GnomeCanvasShapePriv *priv;
g_return_if_fail (object != NULL);
g_return_if_fail (GNOME_IS_CANVAS_SHAPE (object));
shape = GNOME_CANVAS_SHAPE (object);
if (shape->priv) {
priv = shape->priv;
if (priv->gdk) gcbp_destroy_gdk (shape);
if (priv->path) gnome_canvas_path_def_unref (priv->path);
if (priv->dash.dash) g_free (priv->dash.dash);
if (priv->fill_svp) art_svp_free (priv->fill_svp);
if (priv->outline_svp) art_svp_free (priv->outline_svp);
g_free (shape->priv);
shape->priv = NULL;
}
if (GTK_OBJECT_CLASS (parent_class)->destroy)
(* GTK_OBJECT_CLASS (parent_class)->destroy) (object);
}
/**
* gnome_canvas_shape_set_path_def:
* @shape: a GnomeCanvasShape
* @def: a GnomeCanvasPathDef
*
* This function sets the the GnomeCanvasPathDef used by the
* GnomeCanvasShape. Notice, that it does not request updates, as
* it is meant to be used from item implementations, from inside
* update queue.
*/
void
gnome_canvas_shape_set_path_def (GnomeCanvasShape *shape, GnomeCanvasPathDef *def)
{
GnomeCanvasShapePriv *priv;
g_return_if_fail (shape != NULL);
g_return_if_fail (GNOME_IS_CANVAS_SHAPE (shape));
priv = shape->priv;
if (priv->path) {
gnome_canvas_path_def_unref (priv->path);
priv->path = NULL;
}
if (def) {
priv->path = gnome_canvas_path_def_duplicate (def);
}
}
static void
gnome_canvas_shape_set_property (GObject *object,
guint param_id,
const GValue *value,
GParamSpec *pspec)
{
GnomeCanvasItem *item;
GnomeCanvasShape *shape;
GnomeCanvasShapePriv *priv;
GnomeCanvasShapePrivGdk *gdk;
GdkColor color;
GdkColor *colorptr;
ArtVpathDash *dash;
item = GNOME_CANVAS_ITEM (object);
shape = GNOME_CANVAS_SHAPE (object);
priv = shape->priv;
if (!item->canvas->aa) {
gcbp_ensure_gdk (shape);
gdk = priv->gdk;
} else {
gdk = NULL;
}
switch (param_id) {
case PROP_FILL_COLOR:
if (gnome_canvas_get_color (item->canvas, g_value_get_string (value), &color)) {
priv->fill_set = TRUE;
priv->fill_rgba = get_rgba_from_color (&color);
if (gdk) gdk->fill_pixel = color.pixel;
} else if (priv->fill_set)
priv->fill_set = FALSE;
else
break;
gnome_canvas_item_request_update (item);
break;
case PROP_FILL_COLOR_GDK:
colorptr = g_value_get_boxed (value);
if (colorptr != NULL) {
priv->fill_set = TRUE;
priv->fill_rgba = get_rgba_from_color (colorptr);
if (gdk) {
GdkColormap *colormap = gtk_widget_get_colormap (GTK_WIDGET (item->canvas));
GdkColor tmp = *colorptr;
gdk_rgb_find_color (colormap, &tmp);
gdk->fill_pixel = tmp.pixel;
}
} else if (priv->fill_set)
priv->fill_set = FALSE;
else
break;
gnome_canvas_item_request_update (item);
break;
case PROP_FILL_COLOR_RGBA:
priv->fill_set = TRUE;
priv->fill_rgba = g_value_get_uint (value);
if (gdk) gdk->fill_pixel = get_pixel_from_rgba (item, priv->fill_rgba);
gnome_canvas_item_request_update (item);
break;
case PROP_OUTLINE_COLOR:
if (gnome_canvas_get_color (item->canvas, g_value_get_string (value), &color)) {
priv->outline_set = TRUE;
priv->outline_rgba = get_rgba_from_color (&color);
if (gdk) gdk->outline_pixel = color.pixel;
} else if (priv->outline_set)
priv->outline_set = FALSE;
else
break;
gnome_canvas_item_request_update (item);
break;
case PROP_OUTLINE_COLOR_GDK:
colorptr = g_value_get_boxed (value);
if (colorptr != NULL) {
priv->outline_set = TRUE;
priv->outline_rgba = get_rgba_from_color (colorptr);
if (gdk) {
GdkColormap *colormap = gtk_widget_get_colormap (GTK_WIDGET (item->canvas));
GdkColor tmp = *colorptr;
gdk_rgb_find_color (colormap, &tmp);
gdk->outline_pixel = tmp.pixel;
}
} else if (priv->outline_set)
priv->outline_set = FALSE;
else
break;
gnome_canvas_item_request_update (item);
break;
case PROP_OUTLINE_COLOR_RGBA:
priv->outline_set = TRUE;
priv->outline_rgba = g_value_get_uint (value);
if (gdk) gdk->outline_pixel = get_pixel_from_rgba (item, priv->outline_rgba);
gnome_canvas_item_request_update (item);
break;
case PROP_FILL_STIPPLE:
if (gdk) {
set_stipple (gdk->fill_gc, &gdk->fill_stipple, (GdkBitmap*) g_value_get_object (value), FALSE);
gnome_canvas_item_request_update (item);
}
break;
case PROP_OUTLINE_STIPPLE:
if (gdk) {
set_stipple (gdk->outline_gc, &gdk->outline_stipple, (GdkBitmap*) g_value_get_object (value), FALSE);
gnome_canvas_item_request_update (item);
}
break;
case PROP_WIDTH_PIXELS:
priv->width = g_value_get_uint (value);
priv->width_pixels = TRUE;
gnome_canvas_item_request_update (item);
break;
case PROP_WIDTH_UNITS:
priv->width = fabs (g_value_get_double (value));
priv->width_pixels = FALSE;
gnome_canvas_item_request_update (item);
break;
case PROP_WIND:
priv->wind = g_value_get_uint (value);
gnome_canvas_item_request_update (item);
break;
case PROP_CAP_STYLE:
priv->cap = g_value_get_enum (value);
gnome_canvas_item_request_update (item);
break;
case PROP_JOIN_STYLE:
priv->join = g_value_get_enum (value);
gnome_canvas_item_request_update (item);
break;
case PROP_MITERLIMIT:
priv->miterlimit = g_value_get_double (value);
gnome_canvas_item_request_update (item);
break;
case PROP_DASH:
dash = g_value_get_pointer (value);
if (priv->dash.dash) g_free (priv->dash.dash);
priv->dash.dash = NULL;
if (dash) {
priv->dash.offset = dash->offset;
priv->dash.n_dash = dash->n_dash;
if (dash->dash != NULL) {
priv->dash.dash = g_new (double, dash->n_dash);
memcpy (priv->dash.dash, dash->dash, dash->n_dash * sizeof (double));
}
}
gnome_canvas_item_request_update (item);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
break;
}
}
/* Allocates a GdkColor structure filled with the specified pixel, and
* puts it into the specified value for returning it in the get_property
* method.
*/
static void
get_color_value (GnomeCanvasShape *shape, gulong pixel, GValue *value)
{
GnomeCanvas *canvas = GNOME_CANVAS_ITEM (shape)->canvas;
GdkColormap *colormap = gtk_widget_get_colormap (GTK_WIDGET (canvas));
GdkColor color;
gdk_colormap_query_color (colormap, pixel, &color);
g_value_set_boxed (value, &color);
}
/**
* gnome_canvas_shape_get_path_def:
* @shape: a GnomeCanvasShape
*
* This function returns the #GnomeCanvasPathDef that the shape
* currently uses. It adds a reference to the #GnomeCanvasPathDef and
* returns it, if there is not a #GnomeCanvasPathDef set for the shape
* it returns NULL.
*
* Returns: a #GnomeCanvasPathDef or NULL if none is set for the shape.
*/
GnomeCanvasPathDef *
gnome_canvas_shape_get_path_def (GnomeCanvasShape *shape)
{
GnomeCanvasShapePriv *priv;
g_return_val_if_fail (shape != NULL, NULL);
g_return_val_if_fail (GNOME_IS_CANVAS_SHAPE (shape), NULL);
priv = shape->priv;
if (priv->path) {
gnome_canvas_path_def_ref (priv->path);
return priv->path;
}
return NULL;
}
static void
gnome_canvas_shape_get_property (GObject *object,
guint param_id,
GValue *value,
GParamSpec *pspec)
{
GnomeCanvasItem *item = GNOME_CANVAS_ITEM (object);
GnomeCanvasShape *shape = GNOME_CANVAS_SHAPE (object);
GnomeCanvasShapePriv *priv = shape->priv;
GnomeCanvasShapePrivGdk *gdk;
if (!item->canvas->aa) {
gcbp_ensure_gdk (shape);
gdk = priv->gdk;
}
else {
gdk = NULL;
}
switch (param_id) {
case PROP_FILL_COLOR_GDK:
if (gdk) {
get_color_value (shape, gdk->fill_pixel, value);
} else {
get_color_value (shape, 0, value);
}
break;
case PROP_OUTLINE_COLOR_GDK:
if (gdk) {
get_color_value (shape, gdk->outline_pixel, value);
} else {
get_color_value (shape, 0, value);
}
break;
case PROP_FILL_COLOR_RGBA:
g_value_set_uint (value, priv->fill_rgba);
break;
case PROP_OUTLINE_COLOR_RGBA:
g_value_set_uint (value, priv->outline_rgba);
break;
case PROP_FILL_STIPPLE:
if (gdk) {
g_value_set_object (value, gdk->fill_stipple);
} else {
g_value_set_object (value, NULL);
}
break;
case PROP_OUTLINE_STIPPLE:
if (gdk) {
g_value_set_object (value, gdk->outline_stipple);
} else {
g_value_set_object (value, NULL);
}
break;
case PROP_WIND:
g_value_set_uint (value, priv->wind);
break;
case PROP_CAP_STYLE:
g_value_set_enum (value, priv->cap);
break;
case PROP_JOIN_STYLE:
g_value_set_enum (value, priv->join);
break;
case PROP_WIDTH_PIXELS:
g_value_set_uint (value, priv->width);
break;
case PROP_WIDTH_UNITS:
g_value_set_double (value, priv->width);
break;
case PROP_MITERLIMIT:
g_value_set_double (value, priv->miterlimit);
break;
case PROP_DASH:
g_value_set_pointer (value, &priv->dash);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
break;
}
}
static void
gnome_canvas_shape_realize (GnomeCanvasItem *item)
{
GnomeCanvasShape *shape;
shape = GNOME_CANVAS_SHAPE (item);
if (parent_class->realize)
(* parent_class->realize) (item);
if (!item->canvas->aa) {
gcbp_ensure_gdk (shape);
g_assert(item->canvas->layout.bin_window != NULL);
shape->priv->gdk->fill_gc = gdk_gc_new (item->canvas->layout.bin_window);
shape->priv->gdk->outline_gc = gdk_gc_new (item->canvas->layout.bin_window);
}
}
static void
gnome_canvas_shape_unrealize (GnomeCanvasItem *item)
{
GnomeCanvasShape *shape;
shape = GNOME_CANVAS_SHAPE (item);
if (!item->canvas->aa) {
g_assert (shape->priv->gdk != NULL);
g_object_unref (shape->priv->gdk->fill_gc);
shape->priv->gdk->fill_gc = NULL;
g_object_unref (shape->priv->gdk->outline_gc);
shape->priv->gdk->outline_gc = NULL;
}
if (parent_class->unrealize)
(* parent_class->unrealize) (item);
}
static void
gnome_canvas_shape_render (GnomeCanvasItem *item,
GnomeCanvasBuf *buf)
{
GnomeCanvasShape *shape;
shape = GNOME_CANVAS_SHAPE (item);
if (shape->priv->fill_svp != NULL)
gnome_canvas_render_svp (buf,
shape->priv->fill_svp,
shape->priv->fill_rgba);
if (shape->priv->outline_svp != NULL)
gnome_canvas_render_svp (buf,
shape->priv->outline_svp,
shape->priv->outline_rgba);
}
static void
gnome_canvas_shape_draw (GnomeCanvasItem *item,
GdkDrawable *drawable,
int x,
int y,
int width,
int height)
{
static GdkPoint * dpoints = NULL;
static gint num_dpoints = 0;
GnomeCanvasShape * shape;
GnomeCanvasShapePriv * priv;
GnomeCanvasShapePrivGdk * gdk;
gint i, pos, len;
GSList * l;
shape = GNOME_CANVAS_SHAPE (item);
priv = shape->priv;
/* We have to be realized, so gdk struct should exist! */
gdk = shape->priv->gdk;
g_assert (gdk != NULL);
/* Build temporary point list, translated by -x, -y */
if (dpoints == NULL) {
dpoints = g_new (GdkPoint, gdk->num_points);
num_dpoints = gdk->num_points;
} else if (num_dpoints < gdk->num_points) {
dpoints = g_renew (GdkPoint, dpoints, gdk->num_points);
num_dpoints = gdk->num_points;
}
for (i = 0; i < gdk->num_points; i++) {
dpoints[i].x = gdk->points[i].x - x;
dpoints[i].y = gdk->points[i].y - y;
}
if (priv->fill_set) {
/* Ensure, that we have mask and it is big enough */
gcbp_ensure_mask (shape, width, height);
/* Clear mask */
gdk_draw_rectangle (gdk->ctx->mask,
gdk->ctx->clear_gc,
TRUE,
0, 0,
width, height);
/* Draw subpaths, using XOR gc */
pos = 0;
for (l = gdk->closed_paths; l != NULL; l = l->next) {
len = GPOINTER_TO_INT (l->data);
gdk_draw_polygon (gdk->ctx->mask,
gdk->ctx->xor_gc,
TRUE,
&dpoints[pos],
len);
pos += len;
}
/* Set bitmap to clipping mask */
gdk_gc_set_clip_mask (gdk->fill_gc, gdk->ctx->mask);
/* Stipple offset */
if (gdk->fill_stipple) gnome_canvas_set_stipple_origin (item->canvas, gdk->fill_gc);
/* Draw clipped rect to drawable */
gdk_draw_rectangle (drawable,
gdk->fill_gc,
TRUE,
0, 0,
width, height);
}
if (priv->outline_set) {
/* Stipple offset */
if (gdk->outline_stipple) gnome_canvas_set_stipple_origin (item->canvas, gdk->outline_gc);
/* Draw subpaths */
pos = 0;
for (l = gdk->closed_paths; l != NULL; l = l->next) {
len = GPOINTER_TO_INT (l->data);
gdk_draw_polygon (drawable,
gdk->outline_gc,
FALSE,
&dpoints[pos],
len);
pos += len;
}
for (l = gdk->open_paths; l != NULL; l = l->next) {
len = GPOINTER_TO_INT (l->data);
gdk_draw_lines (drawable,
gdk->outline_gc,
&dpoints[pos],
len);
pos += len;
}
}
}
#define GDK_POINTS_BLOCK 32
static void
gnome_canvas_shape_ensure_gdk_points (GnomeCanvasShapePrivGdk *gdk, gint num)
{
if (gdk->len_points < gdk->num_points + num) {
gdk->len_points = MAX (gdk->len_points + GDK_POINTS_BLOCK, gdk->len_points + num);
gdk->points = g_renew (GdkPoint, gdk->points, gdk->len_points);
}
}
static void
gnome_canvas_shape_update_gdk (GnomeCanvasShape * shape, double * affine, ArtSVP * clip, int flags)
{
GnomeCanvasShapePriv * priv;
GnomeCanvasShapePrivGdk * gdk;
int x1 = 0, y1 = 0, x2 = 0, y2 = 0;
gboolean bbox_set = FALSE;
gint width = 0; /* silence gcc */
g_assert (!((GnomeCanvasItem *) shape)->canvas->aa);
priv = shape->priv;
gdk = priv->gdk;
g_assert (gdk != NULL);
if (priv->outline_set) {
GdkLineStyle style;
if (priv->width_pixels) {
width = (int) floor (priv->width + 0.5);
/* Never select 0 pixels unless the user asked for it,
* since that is the X11 zero width lines are non-specified */
if (priv->width_pixels != 0 && width == 0) {
width = 1;
}
} else {
width = (int) floor ((priv->width * priv->scale) + 0.5);
/* Never select 0 pixels unless the user asked for it,
* since that is the X11 zero width lines are non-speciifed */
if (priv->width != 0 && width == 0) {
width = 1;
}
}
/* If dashed, set it in GdkGC */
if ((shape->priv->dash.dash != NULL) && (shape->priv->dash.n_dash > 0)) {
gint8 * dash_list;
gint i;
dash_list = g_new (gint8, shape->priv->dash.n_dash);
for (i = 0; i < priv->dash.n_dash; i++) {
dash_list[i] = (gint8) shape->priv->dash.dash[i];
}
gdk_gc_set_dashes (gdk->outline_gc,
(gint) priv->dash.offset,
dash_list,
priv->dash.n_dash);
g_free (dash_list);
style = GDK_LINE_ON_OFF_DASH;
} else {
style = GDK_LINE_SOLID;
}
/* Set line width, cap, join */
if(gdk->outline_gc) {
gdk_gc_set_line_attributes (gdk->outline_gc,
width,
style,
priv->cap,
priv->join);
/* Colors and stipples */
set_gc_foreground (gdk->outline_gc, gdk->outline_pixel);
set_stipple (gdk->outline_gc, &gdk->outline_stipple, gdk->outline_stipple, TRUE);
}
}
if (priv->fill_set) {
/* Colors and stipples */
if(gdk->fill_gc) {
set_gc_foreground (gdk->fill_gc, gdk->fill_pixel);
set_stipple (gdk->fill_gc, &gdk->fill_stipple, gdk->fill_stipple, TRUE);
}
}
/* Now the crazy part */
/* Free existing GdkPoint array */
if (gdk->points) {
g_free (gdk->points);
gdk->points = NULL;
gdk->len_points = 0;
gdk->num_points = 0;
}
/* Free subpath lists */
while (gdk->closed_paths) gdk->closed_paths = g_slist_remove (gdk->closed_paths, gdk->closed_paths->data);
while (gdk->open_paths) gdk->open_paths = g_slist_remove (gdk->open_paths, gdk->open_paths->data);
/* Calcualte new GdkPoints array and subpath lists */
if (priv->path) {
GnomeCanvasPathDef * apath, * cpath, * opath;
ArtBpath * abpath;
GSList * clist, * olist;
gint pos;
#if 0
/* Allocate array */
gdk->num_points = gnome_canvas_path_def_length (priv->path) * 1000 - 1;
gdk->points = g_new (GdkPoint, gdk->num_points);
g_print ("Points %d\n", gdk->num_points);
/* Transform path */
#endif
abpath = art_bpath_affine_transform (gnome_canvas_path_def_bpath (priv->path), affine);
apath = gnome_canvas_path_def_new_from_bpath (abpath);
/* Split path into open and closed parts */
cpath = gnome_canvas_path_def_closed_parts (apath);
opath = gnome_canvas_path_def_open_parts (apath);
gnome_canvas_path_def_unref (apath);
/* Split partial paths into subpaths */
clist = gnome_canvas_path_def_split (cpath);
gnome_canvas_path_def_unref (cpath);
olist = gnome_canvas_path_def_split (opath);
gnome_canvas_path_def_unref (opath);
pos = 0;
/* Fill GdkPoints and add subpaths to list: closed subpaths */
while (clist) {
GnomeCanvasPathDef * path;
ArtBpath * bpath;
ArtVpath * vpath;
gint len, i;
path = (GnomeCanvasPathDef *) clist->data;
bpath = gnome_canvas_path_def_bpath (path);
vpath = art_bez_path_to_vec (bpath, 0.1);
for (len = 0; vpath[len].code != ART_END; len++) ;
gnome_canvas_shape_ensure_gdk_points (gdk, len);
for (i = 0; i < len; i++) {
gdk->points[pos + i].x = (gint) floor (vpath[i].x + 0.5);
gdk->points[pos + i].y = (gint) floor (vpath[i].y + 0.5);
if (bbox_set) {
x1 = MIN (x1, gdk->points[pos + i].x);
x2 = MAX (x2, gdk->points[pos + i].x);
y1 = MIN (y1, gdk->points[pos + i].y);
y2 = MAX (y2, gdk->points[pos + i].y);
} else {
bbox_set = TRUE;
x1 = x2 = gdk->points[pos + i].x;
y1 = y2 = gdk->points[pos + i].y;
}
}
gdk->num_points += len;
art_free (vpath);
if (len > 0) {
pos += len;
gdk->closed_paths = g_slist_append (gdk->closed_paths, GINT_TO_POINTER (len));
}
gnome_canvas_path_def_unref (path);
clist = g_slist_remove (clist, clist->data);
}
/* Fill GdkPoints and add subpaths to list: open subpaths */
while (olist) {
GnomeCanvasPathDef * path;
ArtBpath * bpath;
ArtVpath * vpath;
gint len, i;
path = (GnomeCanvasPathDef *) olist->data;
bpath = gnome_canvas_path_def_bpath (path);
vpath = art_bez_path_to_vec (bpath, 0.1);
for (len = 0; vpath[len].code != ART_END; len++) ;
gnome_canvas_shape_ensure_gdk_points (gdk, len);
for (i = 0; i < len; i++) {
gdk->points[pos + i].x = (gint) floor (vpath[i].x + 0.5);
gdk->points[pos + i].y = (gint) floor (vpath[i].y + 0.5);
if (bbox_set) {
x1 = MIN (x1, gdk->points[pos + i].x);
x2 = MAX (x2, gdk->points[pos + i].x);
y1 = MIN (y1, gdk->points[pos + i].y);
y2 = MAX (y2, gdk->points[pos + i].y);
} else {
bbox_set = TRUE;
x1 = x2 = gdk->points[pos + i].x;
y1 = y2 = gdk->points[pos + i].y;
}
}
gdk->num_points += len;
art_free (vpath);
if (len > 0) {
pos += len;
gdk->open_paths = g_slist_append (gdk->open_paths, GINT_TO_POINTER (len));
}
gnome_canvas_path_def_unref (path);
olist = g_slist_remove (olist, olist->data);
}
}
if (bbox_set) {
if (priv->outline_set) {
int stroke_border = (priv->join == GDK_JOIN_MITER)
? ceil (10.43*width/2) /* 10.43 is the miter limit for X11 */
: ceil (width/2);
x1 -= stroke_border;
x2 += stroke_border;
y1 -= stroke_border;
y2 += stroke_border;
}
gnome_canvas_update_bbox (GNOME_CANVAS_ITEM (shape),
x1, y1,
x2 + 1, y2 + 1);
}
}
static void
gnome_canvas_shape_update (GnomeCanvasItem *item, double *affine, ArtSVP *clip_path, int flags)
{
GnomeCanvasShape * shape;
GnomeCanvasShapePriv * priv;
ArtSVP * svp;
shape = GNOME_CANVAS_SHAPE (item);
priv = shape->priv;
/* Common part */
if (parent_class->update) {
(* parent_class->update) (item, affine, clip_path, flags);
}
/* Outline width */
shape->priv->scale = art_affine_expansion (affine);
/* Reset bbox */
if (item->canvas->aa) {
gnome_canvas_item_reset_bounds (item);
}
/* Clipped fill SVP */
if ((priv->fill_set) && (priv->path) && (gnome_canvas_path_def_any_closed (priv->path))) {
GnomeCanvasPathDef * cpath;
ArtSvpWriter *swr;
ArtVpath *vpath;
ArtBpath *abp;
ArtSVP *svp2;
/* Get closed part of path */
cpath = gnome_canvas_path_def_closed_parts (shape->priv->path);
abp = art_bpath_affine_transform (gnome_canvas_path_def_bpath (cpath), affine);
gnome_canvas_path_def_unref (cpath);
/* Render, until SVP */
vpath = art_bez_path_to_vec (abp, 0.1);
art_free (abp);
svp = art_svp_from_vpath (vpath);
art_free (vpath);
swr = art_svp_writer_rewind_new (shape->priv->wind);
art_svp_intersector (svp, swr);
svp2 = art_svp_writer_rewind_reap (swr);
art_svp_free (svp);
if (item->canvas->aa) {
/* Update clipped path */
gnome_canvas_item_update_svp_clip (item,
&shape->priv->fill_svp,
svp2,
clip_path);
} else {
if (priv->fill_svp) {
art_svp_free (priv->fill_svp);
priv->fill_svp = NULL;
}
/* No clipping */
shape->priv->fill_svp = svp2;
}
}
if (priv->outline_set && priv->path && !gnome_canvas_path_def_is_empty (priv->path)) {
gdouble width;
ArtBpath * abp;
ArtVpath * vpath;
/* Set linewidth */
if (priv->width_pixels) {
width = priv->width;
} else {
width = priv->width * priv->scale;
}
if (width < 0.5) width = 0.5;
/* Render full path until vpath */
abp = art_bpath_affine_transform (gnome_canvas_path_def_bpath (priv->path), affine);
vpath = art_bez_path_to_vec (abp, 0.1);
art_free (abp);
/* If dashed, apply dash */
if (priv->dash.dash != NULL)
{
ArtVpath *old = vpath;
vpath = art_vpath_dash (old, &priv->dash);
art_free (old);
}
/* Stroke vpath to SVP */
svp = art_svp_vpath_stroke (vpath,
gnome_canvas_join_gdk_to_art (priv->join),
gnome_canvas_cap_gdk_to_art (priv->cap),
width,
priv->miterlimit,
0.25);
art_free (vpath);
if (item->canvas->aa) {
/* Update clipped */
gnome_canvas_item_update_svp_clip (item, &priv->outline_svp, svp, clip_path);
} else {
if (priv->outline_svp) {
art_svp_free (priv->outline_svp);
priv->outline_svp = NULL;
}
/* No clipping (yet) */
shape->priv->outline_svp = svp;
}
}
/* Gdk requires additional handling */
if (!item->canvas->aa) {
gnome_canvas_shape_update_gdk (shape, affine, clip_path, flags);
}
}
static double
gnome_canvas_shape_point (GnomeCanvasItem *item, double x, double y,
int cx, int cy, GnomeCanvasItem **actual_item)
{
GnomeCanvasShape *shape;
double dist;
int wind;
#if 0
/* fixme: This is just for debugging, canvas should ensure that */
/* fixme: IF YOU ARE SURE THAT IT IS CORRECT BEHAVIOUR, you can remove warning */
/* fixme: and make it to return silently */
g_return_val_if_fail (!item->canvas->need_update, 1e18);
#endif
shape = GNOME_CANVAS_SHAPE (item);
/* todo: update? */
if (shape->priv->fill_set && shape->priv->fill_svp) {
wind = art_svp_point_wind (shape->priv->fill_svp, cx, cy);
if ((shape->priv->wind == ART_WIND_RULE_NONZERO) && (wind != 0)) {
*actual_item = item;
return 0.0;
}
if ((shape->priv->wind == ART_WIND_RULE_ODDEVEN) && ((wind & 0x1) != 0)) {
*actual_item = item;
return 0.0;
}
}
if (shape->priv->outline_set && shape->priv->outline_svp) {
wind = art_svp_point_wind (shape->priv->outline_svp, cx, cy);
if (wind) {
*actual_item = item;
return 0.0;
}
}
if (shape->priv->outline_set && shape->priv->outline_svp) {
dist = art_svp_point_dist (shape->priv->outline_svp, cx, cy);
} else if (shape->priv->fill_set && shape->priv->outline_svp) {
dist = art_svp_point_dist (shape->priv->fill_svp, cx, cy);
} else {
return 1e12;
}
*actual_item = item;
return dist;
}
/* Helpers */
/* Get 32bit rgba color from GdkColor */
static guint32
get_rgba_from_color (GdkColor * color)
{
return ((color->red & 0xff00) << 16) | ((color->green & 0xff00) << 8) | (color->blue & 0xff00) | 0xff;
}
/* Get Gdk pixel value from 32bit rgba color */
static gulong
get_pixel_from_rgba (GnomeCanvasItem *item, guint32 rgba_color)
{
return gnome_canvas_get_color_pixel (item->canvas, rgba_color);
}
/* Convenience function to set a GC's foreground color to the specified pixel value */
static void
set_gc_foreground (GdkGC *gc, gulong pixel)
{
GdkColor c;
g_assert (gc != NULL);
c.pixel = pixel;
gdk_gc_set_foreground (gc, &c);
}
/* Sets the stipple pattern for the specified gc */
static void
set_stipple (GdkGC *gc, GdkBitmap **internal_stipple, GdkBitmap *stipple, int reconfigure)
{
if (*internal_stipple && !reconfigure)
g_object_unref (*internal_stipple);
*internal_stipple = stipple;
if (stipple && !reconfigure)
g_object_ref (stipple);
if (gc) {
if (stipple) {
gdk_gc_set_stipple (gc, stipple);
gdk_gc_set_fill (gc, GDK_STIPPLED);
} else
gdk_gc_set_fill (gc, GDK_SOLID);
}
}
/* Creates private Gdk struct, if not present */
/* We cannot do it during ::init, as we have to know canvas */
static void
gcbp_ensure_gdk (GnomeCanvasShape * shape)
{
g_assert (!((GnomeCanvasItem *) shape)->canvas->aa);
if (!shape->priv->gdk) {
GnomeCanvasShapePrivGdk * gdk;
gdk = g_new (GnomeCanvasShapePrivGdk, 1);
gdk->fill_pixel = get_pixel_from_rgba ((GnomeCanvasItem *) shape, shape->priv->fill_rgba);
gdk->outline_pixel = get_pixel_from_rgba ((GnomeCanvasItem *) shape, shape->priv->outline_rgba);
gdk->fill_stipple = NULL;
gdk->outline_stipple = NULL;
gdk->fill_gc = NULL;
gdk->outline_gc = NULL;
gdk->len_points = 0;
gdk->num_points = 0;
gdk->points = NULL;
gdk->closed_paths = NULL;
gdk->open_paths = NULL;
gdk->ctx = NULL;
shape->priv->gdk = gdk;
}
}
/* Destroy private Gdk struct */
/* It is here, to make ::destroy implementation shorter :) */
static void
gcbp_destroy_gdk (GnomeCanvasShape * shape)
{
GnomeCanvasShapePrivGdk * gdk;
g_assert (!((GnomeCanvasItem *)shape)->canvas->aa);
gdk = shape->priv->gdk;
if (gdk) {
g_assert (!gdk->fill_gc);
g_assert (!gdk->outline_gc);
if (gdk->fill_stipple)
g_object_unref (gdk->fill_stipple);
if (gdk->outline_stipple)
g_object_unref (gdk->outline_stipple);
if (gdk->points)
g_free (gdk->points);
while (gdk->closed_paths)
gdk->closed_paths = g_slist_remove (gdk->closed_paths, gdk->closed_paths->data);
while (gdk->open_paths)
gdk->open_paths = g_slist_remove (gdk->open_paths, gdk->open_paths->data);
if (gdk->ctx)
gcbp_draw_ctx_unref (gdk->ctx);
g_free (gdk);
shape->priv->gdk = NULL;
}
}
/*
* Ensure, that per-canvas Ctx struct is present and bitmaps are
* big enough, to mask full redraw area. Ctx is refcounted and
* defined as "BpathDrawCtx" data member on parent canvas
*/
static void
gcbp_ensure_mask (GnomeCanvasShape * shape, gint width, gint height)
{
GnomeCanvasShapePrivGdk * gdk;
GCBPDrawCtx * ctx;
gdk = shape->priv->gdk;
g_assert (gdk != NULL);
ctx = gdk->ctx;
if (!ctx) {
/* Ctx is not yet defined for us */
GnomeCanvas * canvas;
canvas = GNOME_CANVAS_ITEM (shape)->canvas;
ctx = g_object_get_data (G_OBJECT (canvas), "BpathDrawCtx");
if (!ctx) {
/* Ctx is not defined for parent canvas yet */
ctx = g_new (GCBPDrawCtx, 1);
ctx->refcount = 1;
ctx->canvas = canvas;
ctx->width = 0;
ctx->height = 0;
ctx->mask = NULL;
ctx->clip = NULL;
ctx->clear_gc = NULL;
ctx->xor_gc = NULL;
g_object_set_data (G_OBJECT (canvas), "BpathDrawCtx", ctx);
} else {
ctx->refcount++;
}
gdk->ctx = ctx;
}
/* Now we are sure, that ctx is present and properly refcounted */
if ((width > ctx->width) || (height > ctx->height)) {
/* Ctx is too small */
GdkWindow * window;
window = ((GtkWidget *) (((GnomeCanvasItem *) shape)->canvas))->window;
if (ctx->clear_gc) g_object_unref (ctx->clear_gc);
if (ctx->xor_gc) g_object_unref (ctx->xor_gc);
if (ctx->mask) g_object_unref (ctx->mask);
if (ctx->clip) g_object_unref (ctx->clip);
ctx->mask = gdk_pixmap_new (window, width, height, 1);
ctx->clip = NULL;
ctx->clear_gc = gdk_gc_new (ctx->mask);
gdk_gc_set_function (ctx->clear_gc, GDK_CLEAR);
ctx->xor_gc = gdk_gc_new (ctx->mask);
gdk_gc_set_function (ctx->xor_gc, GDK_INVERT);
}
}
/* It is cleaner to have it here, not in parent function */
static void
gcbp_draw_ctx_unref (GCBPDrawCtx * ctx)
{
if (--ctx->refcount < 1) {
if (ctx->clear_gc)
g_object_unref (ctx->clear_gc);
if (ctx->xor_gc)
g_object_unref (ctx->xor_gc);
if (ctx->mask)
g_object_unref (ctx->mask);
if (ctx->clip)
g_object_unref (ctx->clip);
g_object_set_data (G_OBJECT (ctx->canvas), "BpathDrawCtx", NULL);
g_free (ctx);
}
}
static void
gnome_canvas_shape_bounds (GnomeCanvasItem *item, double *x1, double *y1, double *x2, double *y2)
{
GnomeCanvasShape * shape;
GnomeCanvasShapePriv * priv;
ArtDRect bbox;
ArtSVP * svp;
shape = GNOME_CANVAS_SHAPE (item);
priv = shape->priv;
bbox.x0 = *x1;
bbox.y0 = *y1;
bbox.x1 = *x2;
bbox.y1 = *y2;
if (priv->outline_set && priv->path && !gnome_canvas_path_def_is_empty (priv->path)) {
gdouble width;
ArtVpath * vpath;
/* Set linewidth */
if (priv->width_pixels) {
width = priv->width;
} else {
width = priv->width * priv->scale;
}
if (width < 0.5) width = 0.5;
/* Render full path until vpath */
vpath = art_bez_path_to_vec (gnome_canvas_path_def_bpath (priv->path), 0.1);
/* If dashed, apply dash */
if (priv->dash.dash != NULL)
{
ArtVpath *old = vpath;
vpath = art_vpath_dash (old, &priv->dash);
art_free (old);
}
/* Stroke vpath to SVP */
svp = art_svp_vpath_stroke (vpath,
gnome_canvas_join_gdk_to_art (priv->join),
gnome_canvas_cap_gdk_to_art (priv->cap),
width,
priv->miterlimit,
0.25);
art_free (vpath);
art_drect_svp (&bbox, svp);
art_svp_free (svp);
} else if ((priv->fill_set) && (priv->path) && (gnome_canvas_path_def_any_closed (priv->path))) {
GnomeCanvasPathDef *cpath;
ArtSvpWriter *swr;
ArtVpath *vpath;
ArtSVP *svp2;
/* Get closed part of path */
cpath = gnome_canvas_path_def_closed_parts (shape->priv->path);
/* Render, until SVP */
vpath = art_bez_path_to_vec (gnome_canvas_path_def_bpath (cpath), 0.1);
gnome_canvas_path_def_unref (cpath);
svp = art_svp_from_vpath (vpath);
art_free (vpath);
swr = art_svp_writer_rewind_new (shape->priv->wind);
art_svp_intersector (svp, swr);
svp2 = art_svp_writer_rewind_reap (swr);
art_svp_free (svp);
art_drect_svp (&bbox, svp2);
art_svp_free (svp2);
}
*x1 = bbox.x0;
*y1 = bbox.y0;
*x2 = bbox.x1;
*y2 = bbox.y1;
}
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