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foo-canvas-rect-ellipse.c 35.57 KiB
/* Last edited: Mar 4 15:21 2010 (edgrif) */
/*
* Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation
* All rights reserved.
*
* This file is part of the Gnome Library.
*
* The Gnome Library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* The Gnome Library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with the Gnome Library; see the file COPYING.LIB. If not,
* write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
@NOTATION@
*/
/* Rectangle and ellipse item types for FooCanvas widget
*
* FooCanvas 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.
*
*
* Author: Federico Mena <federico@nuclecu.unam.mx>
*/
#include <config.h>
#include <math.h>
#include "foo-canvas-rect-ellipse.h"
#include "foo-canvas-util.h"
#include <string.h>
#ifdef HAVE_RENDER
#include <gdk/gdkx.h>
#include <X11/extensions/Xrender.h>
#endif
/* Base class for rectangle and ellipse item types */
#define noVERBOSE
enum {
PROP_0,
PROP_X1,
PROP_Y1,
PROP_X2,
PROP_Y2,
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
};
static void foo_canvas_re_class_init (FooCanvasREClass *klass);
static void foo_canvas_re_init (FooCanvasRE *re);static void foo_canvas_re_destroy (GtkObject *object);
static void foo_canvas_re_set_property (GObject *object,
guint param_id,
const GValue *value,
GParamSpec *pspec);
static void foo_canvas_re_get_property (GObject *object,
guint param_id,
GValue *value,
GParamSpec *pspec);
static void foo_canvas_re_update_shared (FooCanvasItem *item,
double i2w_dx, double i2w_dy, int flags);
static void foo_canvas_re_realize (FooCanvasItem *item);
static void foo_canvas_re_unrealize (FooCanvasItem *item);
static void foo_canvas_re_bounds (FooCanvasItem *item, double *x1, double *y1, double *x2, double *y2);
static void foo_canvas_re_translate (FooCanvasItem *item, double dx, double dy);
static void foo_canvas_rect_update (FooCanvasItem *item, double i2w_dx, double i2w_dy, int flags);
static void foo_canvas_ellipse_update (FooCanvasItem *item, double i2w_dx, double i2w_dy, int flags);
typedef struct {
/*< public >*/
int x0, y0, x1, y1;
} Rect;
static Rect make_rect (int x0, int y0, int x1, int y1);
static void diff_rects (Rect r1, Rect r2, int *count, Rect result[4]);
static FooCanvasItemClass *re_parent_class;
static FooCanvasREClass *rect_parent_class;
GType
foo_canvas_re_get_type (void)
{
static GType re_type = 0;
if (!re_type) {
GTypeInfo re_info = {
sizeof (FooCanvasREClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) foo_canvas_re_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (FooCanvasRE),
0, /* n_preallocs */
(GInstanceInitFunc) foo_canvas_re_init
};
re_type = g_type_register_static (foo_canvas_item_get_type (),
"FooCanvasRE",
&re_info,
0);
}
return re_type;
}
static void
foo_canvas_re_class_init (FooCanvasREClass *klass)
{
GObjectClass *gobject_class;
GtkObjectClass *object_class;
FooCanvasItemClass *item_class;
gobject_class = (GObjectClass *) klass;
object_class = (GtkObjectClass *) klass;
item_class = (FooCanvasItemClass *) klass;
re_parent_class = g_type_class_peek_parent (klass);
gobject_class->set_property = foo_canvas_re_set_property;
gobject_class->get_property = foo_canvas_re_get_property;
g_object_class_install_property
(gobject_class,
PROP_X1,
g_param_spec_double ("x1", NULL, NULL,
-G_MAXDOUBLE, G_MAXDOUBLE, 0,
G_PARAM_READWRITE));
g_object_class_install_property
(gobject_class,
PROP_Y1,
g_param_spec_double ("y1", NULL, NULL,
-G_MAXDOUBLE, G_MAXDOUBLE, 0,
G_PARAM_READWRITE));
g_object_class_install_property
(gobject_class,
PROP_X2,
g_param_spec_double ("x2", NULL, NULL,
-G_MAXDOUBLE, G_MAXDOUBLE, 0,
G_PARAM_READWRITE));
g_object_class_install_property
(gobject_class,
PROP_Y2,
g_param_spec_double ("y2", NULL, NULL,
-G_MAXDOUBLE, G_MAXDOUBLE, 0,
G_PARAM_READWRITE));
g_object_class_install_property
(gobject_class,
PROP_FILL_COLOR,
g_param_spec_string ("fill-color", NULL, NULL,
NULL,
G_PARAM_READWRITE));
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_READWRITE));
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_READWRITE));
g_object_class_install_property
(gobject_class,
PROP_FILL_STIPPLE,
g_param_spec_object ("fill-stipple", NULL, NULL,
GDK_TYPE_DRAWABLE,
G_PARAM_READWRITE));
g_object_class_install_property
(gobject_class,
PROP_OUTLINE_COLOR,
g_param_spec_string ("outline-color", NULL, NULL,
NULL,
G_PARAM_READWRITE));
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_READWRITE));
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_READWRITE)); g_object_class_install_property
(gobject_class,
PROP_OUTLINE_STIPPLE,
g_param_spec_object ("outline-stipple", NULL, NULL,
GDK_TYPE_DRAWABLE,
G_PARAM_READWRITE));
g_object_class_install_property
(gobject_class,
PROP_WIDTH_PIXELS,
g_param_spec_uint ("width-pixels", NULL, NULL,
0, G_MAXUINT, 0,
G_PARAM_READWRITE));
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_READWRITE));
object_class->destroy = foo_canvas_re_destroy;
item_class->realize = foo_canvas_re_realize;
item_class->unrealize = foo_canvas_re_unrealize;
item_class->translate = foo_canvas_re_translate;
item_class->bounds = foo_canvas_re_bounds;
}
static void
foo_canvas_re_init (FooCanvasRE *re)
{
re->x1 = 0.0;
re->y1 = 0.0;
re->x2 = 0.0;
re->y2 = 0.0;
re->width = 0.0;
}
static void
foo_canvas_re_destroy (GtkObject *object)
{
FooCanvasRE *re;
g_return_if_fail (object != NULL);
g_return_if_fail (FOO_IS_CANVAS_RE (object));
re = FOO_CANVAS_RE (object);
/* remember, destroy can be run multiple times! */
if (re->fill_stipple)
g_object_unref (re->fill_stipple);
re->fill_stipple = NULL;
if (re->outline_stipple)
g_object_unref (re->outline_stipple);
re->outline_stipple = NULL;
if (GTK_OBJECT_CLASS (re_parent_class)->destroy)
(* GTK_OBJECT_CLASS (re_parent_class)->destroy) (object);
}
static void get_bounds (FooCanvasRE *re, double *px1, double *py1, double *px2, double *py2)
{
FooCanvasItem *item;
double x1, y1, x2, y2;
int cx1, cy1, cx2, cy2;
double hwidth;
#ifdef VERBOSE
g_print ("re get_bounds\n");#endif
item = FOO_CANVAS_ITEM (re);
if (re->width_pixels)
hwidth = (re->width / item->canvas->pixels_per_unit_x) / 2.0;
else
hwidth = re->width / 2.0;
x1 = re->x1;
y1 = re->y1;
x2 = re->x2;
y2 = re->y2;
foo_canvas_item_i2w (item, &x1, &y1);
foo_canvas_item_i2w (item, &x2, &y2);
foo_canvas_w2c (item->canvas, x1 - hwidth, y1 - hwidth, &cx1, &cy1);
foo_canvas_w2c (item->canvas, x2 + hwidth, y2 + hwidth, &cx2, &cy2);
*px1 = cx1;
*py1 = cy1;
*px2 = cx2;
*py2 = cy2;
/* Some safety fudging */
*px1 -= 2;
*py1 -= 2;
*px2 += 2;
*py2 += 2;
}
/* 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;
if (!gc)
return;
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);
}
}
/* Recalculate the outline width of the rectangle/ellipse and set it in its GC */
static void
set_outline_gc_width (FooCanvasRE *re)
{
int width;
if (!re->outline_gc) return;
if (re->width_pixels)
width = (int) re->width;
else
width = (int) (re->width * re->item.canvas->pixels_per_unit_x + 0.5);
gdk_gc_set_line_attributes (re->outline_gc, width,
GDK_LINE_SOLID, GDK_CAP_PROJECTING, GDK_JOIN_MITER);
}
static void
foo_canvas_re_set_fill (FooCanvasRE *re, gboolean fill_set)
{
if (re->fill_set != fill_set) {
re->fill_set = fill_set;
foo_canvas_item_request_update (FOO_CANVAS_ITEM (re));
}
}
static void
foo_canvas_re_set_outline (FooCanvasRE *re, gboolean outline_set)
{
if (re->outline_set != outline_set) {
re->outline_set = outline_set;
foo_canvas_item_request_update (FOO_CANVAS_ITEM (re));
}
}
static void
foo_canvas_re_set_property (GObject *object,
guint param_id,
const GValue *value,
GParamSpec *pspec)
{
FooCanvasItem *item;
FooCanvasRE *re;
GdkColor color = { 0, 0, 0, 0, };
GdkColor *pcolor;
int have_pixel;
g_return_if_fail (object != NULL);
g_return_if_fail (FOO_IS_CANVAS_RE (object));
item = FOO_CANVAS_ITEM (object);
re = FOO_CANVAS_RE (object);
have_pixel = FALSE;
switch (param_id) {
case PROP_X1:
re->x1 = g_value_get_double (value);
foo_canvas_item_request_update (item);
break;
case PROP_Y1:
re->y1 = g_value_get_double (value);
foo_canvas_item_request_update (item);
break;
case PROP_X2:
re->x2 = g_value_get_double (value);
foo_canvas_item_request_update (item);
break;
case PROP_Y2:
re->y2 = g_value_get_double (value);
foo_canvas_item_request_update (item);
break;
case PROP_FILL_COLOR:
case PROP_FILL_COLOR_GDK:
case PROP_FILL_COLOR_RGBA:
switch (param_id) {
case PROP_FILL_COLOR:
if (g_value_get_string (value) &&
gdk_color_parse (g_value_get_string (value), &color))
foo_canvas_re_set_fill (re, TRUE);
else
foo_canvas_re_set_fill (re, FALSE);
re->fill_color = ((color.red & 0xff00) << 16 |
(color.green & 0xff00) << 8 |
(color.blue & 0xff00) |
0xff);
break;
case PROP_FILL_COLOR_GDK:
pcolor = g_value_get_boxed (value);
foo_canvas_re_set_fill (re, pcolor != NULL);
if (pcolor) {
GdkColormap *colormap;
color = *pcolor;
colormap = gtk_widget_get_colormap (GTK_WIDGET (item->canvas));
gdk_rgb_find_color (colormap, &color);
have_pixel = TRUE;
}
re->fill_color = ((color.red & 0xff00) << 16 |
(color.green & 0xff00) << 8 |
(color.blue & 0xff00) |
0xff);
break;
case PROP_FILL_COLOR_RGBA:
foo_canvas_re_set_fill (re, TRUE);
re->fill_color = g_value_get_uint (value);
break;
}
#ifdef VERBOSE
g_print ("re fill color = %08x\n", re->fill_color);
#endif
if (have_pixel)
re->fill_pixel = color.pixel;
else
re->fill_pixel = foo_canvas_get_color_pixel (item->canvas, re->fill_color);
set_gc_foreground (re->fill_gc, re->fill_pixel);
foo_canvas_item_request_redraw (item);
break;
case PROP_OUTLINE_COLOR:
case PROP_OUTLINE_COLOR_GDK:
case PROP_OUTLINE_COLOR_RGBA:
switch (param_id) {
case PROP_OUTLINE_COLOR:
if (g_value_get_string (value) &&
gdk_color_parse (g_value_get_string (value), &color))
foo_canvas_re_set_outline (re, TRUE);
else
foo_canvas_re_set_outline (re, FALSE);
re->outline_color = ((color.red & 0xff00) << 16 |
(color.green & 0xff00) << 8 | (color.blue & 0xff00) |
0xff);
break;
case PROP_OUTLINE_COLOR_GDK:
pcolor = g_value_get_boxed (value);
foo_canvas_re_set_outline (re, pcolor != NULL);
if (pcolor) {
GdkColormap *colormap;
color = *pcolor;
colormap = gtk_widget_get_colormap (GTK_WIDGET (item->canvas));
gdk_rgb_find_color (colormap, &color);
have_pixel = TRUE;
}
re->outline_color = ((color.red & 0xff00) << 16 |
(color.green & 0xff00) << 8 |
(color.blue & 0xff00) |
0xff);
break;
case PROP_OUTLINE_COLOR_RGBA:
foo_canvas_re_set_outline (re, TRUE);
re->outline_color = g_value_get_uint (value);
break;
}
#ifdef VERBOSE
g_print ("re outline color %x %x %x\n", color.red, color.green, color.blue);
#endif
if (have_pixel)
re->outline_pixel = color.pixel;
else
re->outline_pixel = foo_canvas_get_color_pixel (item->canvas,
re->outline_color);
set_gc_foreground (re->outline_gc, re->outline_pixel);
foo_canvas_item_request_redraw (item);
break;
case PROP_FILL_STIPPLE:
set_stipple (re->fill_gc, &re->fill_stipple, (GdkBitmap *) g_value_get_object (value), FALSE);
break;
case PROP_OUTLINE_STIPPLE:
set_stipple (re->outline_gc, &re->outline_stipple, (GdkBitmap *) g_value_get_object (value), FALSE);
break;
case PROP_WIDTH_PIXELS:
re->width = g_value_get_uint (value);
re->width_pixels = TRUE;
set_outline_gc_width (re);
foo_canvas_item_request_update (item);
break;
case PROP_WIDTH_UNITS:
re->width = fabs (g_value_get_double (value));
re->width_pixels = FALSE;
set_outline_gc_width (re);
foo_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 (FooCanvasRE *re, gulong pixel, GValue *value)
{
GdkColor color;
FooCanvasItem *item = (FooCanvasItem *) re;
GdkColormap *colormap = gtk_widget_get_colormap (GTK_WIDGET (item->canvas));
gdk_colormap_query_color (colormap, pixel, &color);
g_value_set_boxed (value, &color);
}
static void
foo_canvas_re_get_property (GObject *object,
guint param_id,
GValue *value,
GParamSpec *pspec)
{
FooCanvasRE *re;
g_return_if_fail (object != NULL);
g_return_if_fail (FOO_IS_CANVAS_RE (object));
re = FOO_CANVAS_RE (object);
switch (param_id) {
case PROP_X1:
g_value_set_double (value, re->x1);
break;
case PROP_Y1:
g_value_set_double (value, re->y1);
break;
case PROP_X2:
g_value_set_double (value, re->x2);
break;
case PROP_Y2:
g_value_set_double (value, re->y2);
break;
case PROP_FILL_COLOR_GDK:
get_color_value (re, re->fill_pixel, value);
break;
case PROP_OUTLINE_COLOR_GDK:
get_color_value (re, re->outline_pixel, value);
break;
case PROP_FILL_COLOR_RGBA:
g_value_set_uint (value, re->fill_color);
break;
case PROP_OUTLINE_COLOR_RGBA:
g_value_set_uint (value, re->outline_color);
break;
case PROP_FILL_STIPPLE:
g_value_set_object (value, (GObject *) re->fill_stipple);
break;
case PROP_OUTLINE_STIPPLE:
g_value_set_object (value, (GObject *) re->outline_stipple); break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
break;
}
}
static void
set_colors_and_stipples (FooCanvasRE *re)
{
set_gc_foreground (re->fill_gc, re->fill_pixel);
set_gc_foreground (re->outline_gc, re->outline_pixel);
set_stipple (re->fill_gc, &re->fill_stipple, re->fill_stipple, TRUE);
set_stipple (re->outline_gc, &re->outline_stipple, re->outline_stipple, TRUE);
set_outline_gc_width (re);
}
static void
foo_canvas_re_update_shared (FooCanvasItem *item, double i2w_dx, double i2w_dy, int flags)
{
FooCanvasRE *re;
#ifdef VERBOSE
g_print ("foo_canvas_re_update_shared\n");
#endif
re = FOO_CANVAS_RE (item);
if (re_parent_class->update)
(* re_parent_class->update) (item, i2w_dx, i2w_dy, flags);
set_colors_and_stipples (re);
#ifdef OLD_XFORM
recalc_bounds (re);
#endif
}
static void
foo_canvas_re_realize (FooCanvasItem *item)
{
FooCanvasRE *re;
#ifdef VERBOSE
g_print ("foo_canvas_re_realize\n");
#endif
re = FOO_CANVAS_RE (item);
if (re_parent_class->realize)
(* re_parent_class->realize) (item);
re->fill_gc = gdk_gc_new (item->canvas->layout.bin_window);
re->fill_pixel = foo_canvas_get_color_pixel (item->canvas, re->fill_color);
re->outline_gc = gdk_gc_new (item->canvas->layout.bin_window);
re->outline_pixel = foo_canvas_get_color_pixel (item->canvas, re->outline_color);
set_colors_and_stipples (re);
#ifdef OLD_XFORM
(* FOO_CANVAS_ITEM_CLASS (item->object.klass)->update) (item, NULL, NULL, 0);
#endif
}
static void
foo_canvas_re_unrealize (FooCanvasItem *item)
{
FooCanvasRE *re;
re = FOO_CANVAS_RE (item);
g_object_unref (re->fill_gc); re->fill_gc = NULL;
g_object_unref (re->outline_gc);
re->outline_gc = NULL;
if (re_parent_class->unrealize)
(* re_parent_class->unrealize) (item);
}
static void
foo_canvas_re_translate (FooCanvasItem *item, double dx, double dy)
{
FooCanvasRE *re;
#ifdef VERBOSE
g_print ("foo_canvas_re_translate\n");
#endif
re = FOO_CANVAS_RE (item);
re->x1 += dx;
re->y1 += dy;
re->x2 += dx;
re->y2 += dy;
}
static void
foo_canvas_re_bounds (FooCanvasItem *item, double *x1, double *y1, double *x2, double *y2)
{
FooCanvasRE *re;
double hwidth;
#ifdef VERBOSE
g_print ("foo_canvas_re_bounds\n");
#endif
re = FOO_CANVAS_RE (item);
if (re->width_pixels)
hwidth = (re->width / item->canvas->pixels_per_unit_x) / 2.0;
else
hwidth = re->width / 2.0;
*x1 = re->x1 - hwidth;
*y1 = re->y1 - hwidth;
*x2 = re->x2 + hwidth;
*y2 = re->y2 + hwidth;
}
/* Rectangle item */
static void foo_canvas_rect_class_init (FooCanvasRectClass *klass);
static void foo_canvas_rect_init (FooCanvasRect *rect);
static void foo_canvas_rect_finalize (GObject *object);
static void foo_canvas_rect_realize (FooCanvasItem *item);
static void foo_canvas_rect_draw (FooCanvasItem *item, GdkDrawable *drawable, GdkEventExpose *expose);
static double foo_canvas_rect_point (FooCanvasItem *item, double x, double y, int cx, int cy,
FooCanvasItem **actual_item);
struct _FooCanvasRectPrivate {
Rect last_update_rect;
Rect last_outline_update_rect;
int last_outline_update_width;
#ifdef HAVE_RENDER
gboolean use_render;
XRenderPictFormat *format;
#endif
};
GType
foo_canvas_rect_get_type (void)
{
static GType rect_type = 0;
if (!rect_type) {
GTypeInfo rect_info = {
sizeof (FooCanvasRectClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) foo_canvas_rect_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (FooCanvasRect),
0, /* n_preallocs */
(GInstanceInitFunc) foo_canvas_rect_init
};
rect_type = g_type_register_static (foo_canvas_re_get_type (),
"FooCanvasRect",
&rect_info,
0);
}
return rect_type;
}
static void
foo_canvas_rect_class_init (FooCanvasRectClass *klass)
{
FooCanvasItemClass *item_class;
rect_parent_class = g_type_class_peek_parent (klass);
item_class = (FooCanvasItemClass *) klass;
item_class->draw = foo_canvas_rect_draw;
item_class->point = foo_canvas_rect_point;
item_class->update = foo_canvas_rect_update;
item_class->realize = foo_canvas_rect_realize;
G_OBJECT_CLASS (klass)->finalize = foo_canvas_rect_finalize;
}
static void
foo_canvas_rect_init (FooCanvasRect *rect)
{
rect->priv = g_new0 (FooCanvasRectPrivate, 1);
}
static void
foo_canvas_rect_finalize (GObject *object)
{
FooCanvasRect *rect = FOO_CANVAS_RECT (object);
if (rect->priv) {
g_free (rect->priv);
}
G_OBJECT_CLASS (rect_parent_class)->finalize (object);
}
static void
foo_canvas_rect_realize (FooCanvasItem *item)
{
#ifdef HAVE_RENDER
FooCanvasRectPrivate *priv;
int event_base, error_base;
Display *dpy;
priv = FOO_CANVAS_RECT (item)->priv;
dpy = gdk_x11_drawable_get_xdisplay (GTK_WIDGET (item->canvas)->window);
priv->use_render = XRenderQueryExtension (dpy, &event_base, &error_base);
if (priv->use_render) {
GdkVisual *gdk_visual;
Visual *visual;
gdk_visual = gtk_widget_get_visual (GTK_WIDGET (item->canvas));
visual = gdk_x11_visual_get_xvisual (gdk_visual);
priv->format = XRenderFindVisualFormat (dpy, visual);
}
#endif
if (FOO_CANVAS_ITEM_CLASS (rect_parent_class)->realize) {
(* FOO_CANVAS_ITEM_CLASS (rect_parent_class)->realize) (item);
}
}
static void
render_rect_alpha (FooCanvasRect *rect,
GdkDrawable *drawable,
int x, int y,
int width, int height,
guint32 rgba)
{
GdkPixbuf *pixbuf;
guchar *data;
int rowstride, i;
guchar r, g, b, a;
FooCanvasRectPrivate *priv;
if (width <= 0 || height <= 0 ) {
return;
}
priv = rect->priv;
r = (rgba >> 24) & 0xff;
g = (rgba >> 16) & 0xff;
b = (rgba >> 8) & 0xff;
a = (rgba >> 0) & 0xff;
#ifdef HAVE_RENDER
/* Every visual is not guaranteed to have a matching
* XRenderPictFormat. So make sure that format is not null before
* trying to render using Xrender calls.
*/
if (priv->use_render && (priv->format != NULL)) {
GdkDrawable *real_drawable;
int x_offset, y_offset;
Display *dpy;
Picture pict;
XRenderPictureAttributes attributes;
XRenderColor color;
gdk_window_get_internal_paint_info (drawable, &real_drawable,
&x_offset, &y_offset);
dpy = gdk_x11_drawable_get_xdisplay (real_drawable);
pict = XRenderCreatePicture (dpy,
gdk_x11_drawable_get_xid (real_drawable),
priv->format,
0, &attributes);
/* Convert to premultiplied alpha: */
r = r * a / 255;
g = g * a / 255;
b = b * a / 255;
color.red = (r << 8) + r;
color.green = (g << 8) + g;
color.blue = (b << 8) + b;
color.alpha = (a << 8) + a;
XRenderFillRectangle (dpy,
PictOpOver,
pict,
&color,
x - x_offset, y - y_offset,
width, height);
XRenderFreePicture (dpy, pict);
return;
}
#endif
pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8, width, height);
data = gdk_pixbuf_get_pixels (pixbuf);
rowstride = gdk_pixbuf_get_rowstride (pixbuf);
r = (rgba >> 24) & 0xff;
g = (rgba >> 16) & 0xff;
b = (rgba >> 8) & 0xff;
a = (rgba >> 0) & 0xff;
for (i = 0; i < width*4; ) {
data[i++] = r;
data[i++] = g;
data[i++] = b;
data[i++] = a;
}
for (i = 1; i < height; i++) {
memcpy (data + i*rowstride, data, width*4);
}
gdk_draw_pixbuf (drawable, NULL, pixbuf,
0, 0, x, y, width, height,
GDK_RGB_DITHER_NONE, 0, 0);
g_object_unref (pixbuf);
}
static void
foo_canvas_rect_draw (FooCanvasItem *item, GdkDrawable *drawable, GdkEventExpose *expose)
{
FooCanvasRE *re;
double x1, y1, x2, y2;
int cx1, cy1, cx2, cy2;
double i2w_dx, i2w_dy;
re = FOO_CANVAS_RE (item);
/* Get canvas pixel coordinates */
i2w_dx = 0.0;
i2w_dy = 0.0;
foo_canvas_item_i2w (item, &i2w_dx, &i2w_dy);
x1 = re->x1 + i2w_dx;
y1 = re->y1 + i2w_dy;
x2 = re->x2 + i2w_dx; y2 = re->y2 + i2w_dy;
foo_canvas_w2c (item->canvas, x1, y1, &cx1, &cy1);
foo_canvas_w2c (item->canvas, x2, y2, &cx2, &cy2);
if (re->fill_set) {
if ((re->fill_color & 0xff) != 255) {
GdkRectangle *rectangles;
gint i, n_rectangles;
GdkRectangle draw_rect;
GdkRectangle part;
draw_rect.x = cx1;
draw_rect.y = cy1;
draw_rect.width = cx2 - cx1 + 1;
draw_rect.height = cy2 - cy1 + 1;
/* For alpha mode, only render the parts of the region
that are actually exposed */
gdk_region_get_rectangles (expose->region,
&rectangles,
&n_rectangles);
for (i = 0; i < n_rectangles; i++) {
if (gdk_rectangle_intersect (&rectangles[i],
&draw_rect,
&part)) {
render_rect_alpha (FOO_CANVAS_RECT (item),
drawable,
part.x, part.y,
part.width, part.height,
re->fill_color);
}
}
g_free (rectangles);
} else {
if (re->fill_stipple)
foo_canvas_set_stipple_origin (item->canvas, re->fill_gc);
gdk_draw_rectangle (drawable,
re->fill_gc,
TRUE,
cx1, cy1,
cx2 - cx1 + 1,
cy2 - cy1 + 1);
}
}
if (re->outline_set) {
if (re->outline_stipple)
foo_canvas_set_stipple_origin (item->canvas, re->outline_gc);
gdk_draw_rectangle (drawable,
re->outline_gc,
FALSE,
cx1,
cy1,
cx2 - cx1,
cy2 - cy1);
}
}
static double
foo_canvas_rect_point (FooCanvasItem *item, double x, double y, int cx, int cy, FooCanvasItem **actual_item)
{
FooCanvasRE *re;
double x1, y1, x2, y2;
double hwidth;
double dx, dy; double tmp;
#ifdef VERBOSE
g_print ("foo_canvas_rect_point\n");
#endif
re = FOO_CANVAS_RE (item);
*actual_item = item;
/* Find the bounds for the rectangle plus its outline width */
x1 = re->x1;
y1 = re->y1;
x2 = re->x2;
y2 = re->y2;
if (re->outline_set) {
if (re->width_pixels)
hwidth = (re->width / item->canvas->pixels_per_unit_x) / 2.0;
else
hwidth = re->width / 2.0;
x1 -= hwidth;
y1 -= hwidth;
x2 += hwidth;
y2 += hwidth;
} else
hwidth = 0.0;
/* Is point inside rectangle (which can be hollow if it has no fill set)? */
if ((x >= x1) && (y >= y1) && (x <= x2) && (y <= y2)) {
if (re->fill_set || !re->outline_set)
return 0.0;
dx = x - x1;
tmp = x2 - x;
if (tmp < dx)
dx = tmp;
dy = y - y1;
tmp = y2 - y;
if (tmp < dy)
dy = tmp;
if (dy < dx)
dx = dy;
dx -= 2.0 * hwidth;
if (dx < 0.0)
return 0.0;
else
return dx;
}
/* Point is outside rectangle */
if (x < x1)
dx = x1 - x;
else if (x > x2)
dx = x - x2;
else
dx = 0.0;
if (y < y1)
dy = y1 - y;
else if (y > y2)
dy = y - y2;
else dy = 0.0;
return sqrt (dx * dx + dy * dy);
}
static void
request_redraw_borders (FooCanvas *canvas,
Rect *update_rect,
int width)
{
foo_canvas_request_redraw (canvas,
update_rect->x0, update_rect->y0,
update_rect->x1, update_rect->y0 + width);
foo_canvas_request_redraw (canvas,
update_rect->x0, update_rect->y1-width,
update_rect->x1, update_rect->y1);
foo_canvas_request_redraw (canvas,
update_rect->x0, update_rect->y0,
update_rect->x0+width, update_rect->y1);
foo_canvas_request_redraw (canvas,
update_rect->x1-width, update_rect->y0,
update_rect->x1, update_rect->y1);
}
static void
foo_canvas_rect_update (FooCanvasItem *item, double i2w_dx, double i2w_dy, gint flags)
{
FooCanvasRE *re;
double x1, y1, x2, y2;
int cx1, cy1, cx2, cy2;
int repaint_rects_count, i;
int width_pixels;
int width_lt, width_rb;
Rect update_rect, repaint_rects[4];
FooCanvasRectPrivate *priv;
foo_canvas_re_update_shared (item, i2w_dx, i2w_dy, flags);
re = FOO_CANVAS_RE (item);
priv = FOO_CANVAS_RECT (item)->priv;
x1 = re->x1 + i2w_dx;
y1 = re->y1 + i2w_dy;
x2 = re->x2 + i2w_dx;
y2 = re->y2 + i2w_dy;
foo_canvas_w2c (item->canvas, x1, y1, &cx1, &cy1);
foo_canvas_w2c (item->canvas, x2, y2, &cx2, &cy2);
update_rect = make_rect (cx1, cy1, cx2+1, cy2+1);
#if 0
foo_canvas_request_redraw (item->canvas,
update_rect.x0, update_rect.y0,
update_rect.x1, update_rect.y1);
foo_canvas_request_redraw (item->canvas,
priv->last_update_rect.x0, priv->last_update_rect.y0,
priv->last_update_rect.x1, priv->last_update_rect.y1);
#else
diff_rects (update_rect, priv->last_update_rect,
&repaint_rects_count, repaint_rects);
for (i = 0; i < repaint_rects_count; i++) {
foo_canvas_request_redraw (item->canvas,
repaint_rects[i].x0, repaint_rects[i].y0,
repaint_rects[i].x1, repaint_rects[i].y1);
}
#endif
priv->last_update_rect = update_rect;
if (re->outline_set) { /* Outline and bounding box */
if (re->width_pixels)
width_pixels = (int) re->width;
else
width_pixels = (int) floor (re->width * re->item.canvas->pixels_per_unit_x + 0.5);
width_lt = width_pixels / 2;
width_rb = (width_pixels + 1) / 2;
cx1 -= width_lt;
cy1 -= width_lt;
cx2 += width_rb;
cy2 += width_rb;
update_rect = make_rect (cx1, cy1, cx2, cy2);
request_redraw_borders (item->canvas, &update_rect,
(width_lt + width_rb));
request_redraw_borders (item->canvas, &priv->last_outline_update_rect,
priv->last_outline_update_width);
priv->last_outline_update_rect = update_rect;
priv->last_outline_update_width = width_lt + width_rb;
item->x1 = cx1;
item->y1 = cy1;
item->x2 = cx2+1;
item->y2 = cy2+1;
} else {
item->x1 = cx1;
item->y1 = cy1;
item->x2 = cx2+1;
item->y2 = cy2+1;
}
}
/* Ellipse item */
static void foo_canvas_ellipse_class_init (FooCanvasEllipseClass *klass);
static void foo_canvas_ellipse_draw (FooCanvasItem *item, GdkDrawable *drawable, GdkEventExpose *expose);
static double foo_canvas_ellipse_point (FooCanvasItem *item, double x, double y, int cx, int cy,
FooCanvasItem **actual_item);
GType
foo_canvas_ellipse_get_type (void)
{
static GType ellipse_type = 0;
if (!ellipse_type) {
GTypeInfo ellipse_info = {
sizeof (FooCanvasEllipseClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) foo_canvas_ellipse_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (FooCanvasEllipse),
0, /* n_preallocs */
(GInstanceInitFunc) NULL
};
ellipse_type = g_type_register_static (foo_canvas_re_get_type (),
"FooCanvasEllipse",
&ellipse_info,
0);
}
return ellipse_type;}
static void
foo_canvas_ellipse_class_init (FooCanvasEllipseClass *klass)
{
FooCanvasItemClass *item_class;
item_class = (FooCanvasItemClass *) klass;
item_class->draw = foo_canvas_ellipse_draw;
item_class->point = foo_canvas_ellipse_point;
item_class->update = foo_canvas_ellipse_update;
}
static void
foo_canvas_ellipse_draw (FooCanvasItem *item, GdkDrawable *drawable, GdkEventExpose *expose)
{
FooCanvasRE *re;
int x1, y1, x2, y2;
double i2w_dx, i2w_dy;
re = FOO_CANVAS_RE (item);
/* Get canvas pixel coordinates */
i2w_dx = 0.0;
i2w_dy = 0.0;
foo_canvas_item_i2w (item, &i2w_dx, &i2w_dy);
foo_canvas_w2c (item->canvas,
re->x1 + i2w_dx,
re->y1 + i2w_dy,
&x1, &y1);
foo_canvas_w2c (item->canvas,
re->x2 + i2w_dx,
re->y2 + i2w_dy,
&x2, &y2);
if (re->fill_set) {
if (re->fill_stipple)
foo_canvas_set_stipple_origin (item->canvas, re->fill_gc);
gdk_draw_arc (drawable,
re->fill_gc,
TRUE,
x1,
y1,
x2 - x1,
y2 - y1,
0 * 64,
360 * 64);
}
if (re->outline_set) {
if (re->outline_stipple)
foo_canvas_set_stipple_origin (item->canvas, re->outline_gc);
gdk_draw_arc (drawable,
re->outline_gc,
FALSE,
x1,
y1,
x2 - x1,
y2 - y1,
0 * 64,
360 * 64);
}
}
static doublefoo_canvas_ellipse_point (FooCanvasItem *item, double x, double y, int cx, int cy, FooCanvasItem **actual_item)
{
FooCanvasRE *re;
double dx, dy;
double scaled_dist;
double outline_dist;
double center_dist;
double width;
double a, b;
double diamx, diamy;
re = FOO_CANVAS_RE (item);
*actual_item = item;
if (re->outline_set) {
if (re->width_pixels)
width = re->width / item->canvas->pixels_per_unit_x;
else
width = re->width;
} else
width = 0.0;
/* Compute the distance between the center of the ellipse and the point, with the ellipse
* considered as being scaled to a circle.
*/
dx = x - (re->x1 + re->x2) / 2.0;
dy = y - (re->y1 + re->y2) / 2.0;
center_dist = sqrt (dx * dx + dy * dy);
a = dx / ((re->x2 + width - re->x1) / 2.0);
b = dy / ((re->y2 + width - re->y1) / 2.0);
scaled_dist = sqrt (a * a + b * b);
/* If the scaled distance is greater than 1, then we are outside. Compute the distance from
* the point to the edge of the circle, then scale back to the original un-scaled coordinate
* system.
*/
if (scaled_dist > 1.0)
return (center_dist / scaled_dist) * (scaled_dist - 1.0);
/* We are inside the outer edge of the ellipse. If it is filled, then we are "inside".
* Otherwise, do the same computation as above, but also check whether we are inside the
* outline.
*/
if (re->fill_set)
return 0.0;
if (scaled_dist > FOO_CANVAS_EPSILON)
outline_dist = (center_dist / scaled_dist) * (1.0 - scaled_dist) - width;
else {
/* Handle very small distance */
diamx = re->x2 - re->x1;
diamy = re->y2 - re->y1;
if (diamx < diamy)
outline_dist = (diamx - width) / 2.0;
else
outline_dist = (diamy - width) / 2.0;
}
if (outline_dist < 0.0)
return 0.0;
return outline_dist;
}
static void
foo_canvas_ellipse_update (FooCanvasItem *item, double i2w_dx, double i2w_dy, gint flags)
{
FooCanvasRE *re;
double x0, y0, x1, y1;
#ifdef VERBOSE
g_print ("foo_canvas_sllipse_update item %x\n", item);
#endif
foo_canvas_re_update_shared (item, i2w_dx, i2w_dy, flags);
re = FOO_CANVAS_RE (item);
get_bounds (re, &x0, &y0, &x1, &y1);
foo_canvas_update_bbox (item, x0, y0, x1, y1);
}
static int
rect_empty (const Rect *src) {
return (src->x1 <= src->x0 || src->y1 <= src->y0);
}
static Rect
make_rect (int x0, int y0, int x1, int y1)
{
Rect r;
r.x0 = x0;
r.y0 = y0;
r.x1 = x1;
r.y1 = y1;
return r;
}
static gboolean
rects_intersect (Rect r1, Rect r2)
{
if (r1.x0 >= r2.x1) {
return FALSE;
}
if (r2.x0 >= r1.x1) {
return FALSE;
}
if (r1.y0 >= r2.y1) {
return FALSE;
}
if (r2.y0 >= r1.y1) {
return FALSE;
}
return TRUE;
}
static void
diff_rects_guts (Rect ra, Rect rb, int *count, Rect result[4])
{
if (ra.x0 < rb.x0) {
result[(*count)++] = make_rect (ra.x0, ra.y0, rb.x0, ra.y1);
}
if (ra.y0 < rb.y0) {
result[(*count)++] = make_rect (ra.x0, ra.y0, ra.x1, rb.y0);
}
if (ra.x1 < rb.x1) {
result[(*count)++] = make_rect (ra.x1, rb.y0, rb.x1, rb.y1);
}
if (ra.y1 < rb.y1) {
result[(*count)++] = make_rect (rb.x0, ra.y1, rb.x1, rb.y1);
}
}
static void
diff_rects (Rect r1, Rect r2, int *count, Rect result[4])
{
g_assert (count != NULL);
g_assert (result != NULL);
*count = 0;
if (rects_intersect (r1, r2)) {
diff_rects_guts (r1, r2, count, result);
diff_rects_guts (r2, r1, count, result);
} else {
if (!rect_empty (&r1)) {
result[(*count)++] = r1;
}
if (!rect_empty (&r2)) {
result[(*count)++] = r2;
}
}
}