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gtk2/gtk/gtkhsv.c
Matthias Clasen 2ba9c4b4a7 Make focus rectangles optional 
This commit introduces a new setting, gtk-visible-focus, backed
by the Gtk/VisibleFocus X setting. Its three values control how
focus rectangles are displayed.

'always' is equivalent to the traditional GTK+ behaviour of always
rendering focus rectangles.

'never' does what it says, and is intended for keyboardless
situations, e.g. tablets.

'automatic' hides focus rectangles initially, until the user
interacts with the keyboard, at which point focus rectangles
become visible.

https://bugzilla.gnome.org/show_bug.cgi?id=649567
2011-08-10 16:34:20 +02:00

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/* HSV color selector for GTK+
*
* Copyright (C) 1999 The Free Software Foundation
*
* Authors: Simon Budig <Simon.Budig@unix-ag.org> (original code)
* Federico Mena-Quintero <federico@gimp.org> (cleanup for GTK+)
* Jonathan Blandford <jrb@redhat.com> (cleanup for GTK+)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GTK+ Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
*/
#include "config.h"
#include <math.h>
#include <string.h>
#include "gtkhsv.h"
#include "gtkbindings.h"
#include "gtkmarshalers.h"
#include "gtktypebuiltins.h"
#include "gtkintl.h"
/**
* SECTION:gtkhsv
* @Short_description: A 'color wheel' widget
* @Title: GtkHSV
* @See_also: #GtkColorSelection, #GtkColorSelectionDialog
*
* #GtkHSV is the 'color wheel' part of a complete color selector widget.
* It allows to select a color by determining its HSV components in an
* intuitive way. Moving the selection around the outer ring changes the hue,
* and moving the selection point inside the inner triangle changes value and
* saturation.
*/
/* Default width/height */
#define DEFAULT_SIZE 100
/* Default ring width */
#define DEFAULT_RING_WIDTH 10
/* Dragging modes */
typedef enum {
DRAG_NONE,
DRAG_H,
DRAG_SV
} DragMode;
/* Private part of the GtkHSV structure */
struct _GtkHSVPrivate
{
/* Color value */
double h;
double s;
double v;
/* Size and ring width */
int size;
int ring_width;
/* Window for capturing events */
GdkWindow *window;
/* Dragging mode */
DragMode mode;
guint focus_on_ring : 1;
};
/* Signal IDs */
enum {
CHANGED,
MOVE,
LAST_SIGNAL
};
static void gtk_hsv_destroy (GtkWidget *widget);
static void gtk_hsv_realize (GtkWidget *widget);
static void gtk_hsv_unrealize (GtkWidget *widget);
static void gtk_hsv_get_preferred_width (GtkWidget *widget,
gint *minimum,
gint *natural);
static void gtk_hsv_get_preferred_height (GtkWidget *widget,
gint *minimum,
gint *natural);
static void gtk_hsv_size_allocate (GtkWidget *widget,
GtkAllocation *allocation);
static gboolean gtk_hsv_button_press (GtkWidget *widget,
GdkEventButton *event);
static gboolean gtk_hsv_button_release (GtkWidget *widget,
GdkEventButton *event);
static gboolean gtk_hsv_motion (GtkWidget *widget,
GdkEventMotion *event);
static gboolean gtk_hsv_draw (GtkWidget *widget,
cairo_t *cr);
static gboolean gtk_hsv_grab_broken (GtkWidget *widget,
GdkEventGrabBroken *event);
static gboolean gtk_hsv_focus (GtkWidget *widget,
GtkDirectionType direction);
static void gtk_hsv_move (GtkHSV *hsv,
GtkDirectionType dir);
static guint hsv_signals[LAST_SIGNAL];
G_DEFINE_TYPE (GtkHSV, gtk_hsv, GTK_TYPE_WIDGET)
/* Class initialization function for the HSV color selector */
static void
gtk_hsv_class_init (GtkHSVClass *class)
{
GObjectClass *gobject_class;
GtkWidgetClass *widget_class;
GtkHSVClass *hsv_class;
GtkBindingSet *binding_set;
gobject_class = (GObjectClass *) class;
widget_class = (GtkWidgetClass *) class;
hsv_class = GTK_HSV_CLASS (class);
widget_class->destroy = gtk_hsv_destroy;
widget_class->realize = gtk_hsv_realize;
widget_class->unrealize = gtk_hsv_unrealize;
widget_class->get_preferred_width = gtk_hsv_get_preferred_width;
widget_class->get_preferred_height = gtk_hsv_get_preferred_height;
widget_class->size_allocate = gtk_hsv_size_allocate;
widget_class->button_press_event = gtk_hsv_button_press;
widget_class->button_release_event = gtk_hsv_button_release;
widget_class->motion_notify_event = gtk_hsv_motion;
widget_class->draw = gtk_hsv_draw;
widget_class->focus = gtk_hsv_focus;
widget_class->grab_broken_event = gtk_hsv_grab_broken;
gtk_widget_class_set_accessible_role (widget_class, ATK_ROLE_COLOR_CHOOSER);
hsv_class->move = gtk_hsv_move;
hsv_signals[CHANGED] =
g_signal_new (I_("changed"),
G_OBJECT_CLASS_TYPE (gobject_class),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GtkHSVClass, changed),
NULL, NULL,
_gtk_marshal_VOID__VOID,
G_TYPE_NONE, 0);
hsv_signals[MOVE] =
g_signal_new (I_("move"),
G_OBJECT_CLASS_TYPE (gobject_class),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_STRUCT_OFFSET (GtkHSVClass, move),
NULL, NULL,
_gtk_marshal_VOID__ENUM,
G_TYPE_NONE, 1,
GTK_TYPE_DIRECTION_TYPE);
binding_set = gtk_binding_set_by_class (class);
gtk_binding_entry_add_signal (binding_set, GDK_KEY_Up, 0,
"move", 1,
G_TYPE_ENUM, GTK_DIR_UP);
gtk_binding_entry_add_signal (binding_set, GDK_KEY_KP_Up, 0,
"move", 1,
G_TYPE_ENUM, GTK_DIR_UP);
gtk_binding_entry_add_signal (binding_set, GDK_KEY_Down, 0,
"move", 1,
G_TYPE_ENUM, GTK_DIR_DOWN);
gtk_binding_entry_add_signal (binding_set, GDK_KEY_KP_Down, 0,
"move", 1,
G_TYPE_ENUM, GTK_DIR_DOWN);
gtk_binding_entry_add_signal (binding_set, GDK_KEY_Right, 0,
"move", 1,
G_TYPE_ENUM, GTK_DIR_RIGHT);
gtk_binding_entry_add_signal (binding_set, GDK_KEY_KP_Right, 0,
"move", 1,
G_TYPE_ENUM, GTK_DIR_RIGHT);
gtk_binding_entry_add_signal (binding_set, GDK_KEY_Left, 0,
"move", 1,
G_TYPE_ENUM, GTK_DIR_LEFT);
gtk_binding_entry_add_signal (binding_set, GDK_KEY_KP_Left, 0,
"move", 1,
G_TYPE_ENUM, GTK_DIR_LEFT);
g_type_class_add_private (gobject_class, sizeof (GtkHSVPrivate));
}
static void
gtk_hsv_init (GtkHSV *hsv)
{
GtkHSVPrivate *priv;
priv = G_TYPE_INSTANCE_GET_PRIVATE (hsv, GTK_TYPE_HSV, GtkHSVPrivate);
hsv->priv = priv;
gtk_widget_set_has_window (GTK_WIDGET (hsv), FALSE);
gtk_widget_set_can_focus (GTK_WIDGET (hsv), TRUE);
priv->h = 0.0;
priv->s = 0.0;
priv->v = 0.0;
priv->size = DEFAULT_SIZE;
priv->ring_width = DEFAULT_RING_WIDTH;
}
static void
gtk_hsv_destroy (GtkWidget *widget)
{
GTK_WIDGET_CLASS (gtk_hsv_parent_class)->destroy (widget);
}
static void
gtk_hsv_realize (GtkWidget *widget)
{
GtkHSV *hsv = GTK_HSV (widget);
GtkHSVPrivate *priv = hsv->priv;
GtkAllocation allocation;
GdkWindow *parent_window;
GdkWindowAttr attr;
int attr_mask;
gtk_widget_set_realized (widget, TRUE);
gtk_widget_get_allocation (widget, &allocation);
attr.window_type = GDK_WINDOW_CHILD;
attr.x = allocation.x;
attr.y = allocation.y;
attr.width = allocation.width;
attr.height = allocation.height;
attr.wclass = GDK_INPUT_ONLY;
attr.event_mask = gtk_widget_get_events (widget);
attr.event_mask |= (GDK_KEY_PRESS_MASK
| GDK_BUTTON_PRESS_MASK
| GDK_BUTTON_RELEASE_MASK
| GDK_POINTER_MOTION_MASK
| GDK_ENTER_NOTIFY_MASK
| GDK_LEAVE_NOTIFY_MASK);
attr_mask = GDK_WA_X | GDK_WA_Y;
parent_window = gtk_widget_get_parent_window (widget);
gtk_widget_set_window (widget, parent_window);
g_object_ref (parent_window);
priv->window = gdk_window_new (parent_window, &attr, attr_mask);
gdk_window_set_user_data (priv->window, hsv);
gdk_window_show (priv->window);
}
static void
gtk_hsv_unrealize (GtkWidget *widget)
{
GtkHSV *hsv = GTK_HSV (widget);
GtkHSVPrivate *priv = hsv->priv;
gdk_window_set_user_data (priv->window, NULL);
gdk_window_destroy (priv->window);
priv->window = NULL;
GTK_WIDGET_CLASS (gtk_hsv_parent_class)->unrealize (widget);
}
static void
gtk_hsv_get_preferred_width (GtkWidget *widget,
gint *minimum,
gint *natural)
{
GtkHSV *hsv = GTK_HSV (widget);
GtkHSVPrivate *priv = hsv->priv;
gint focus_width;
gint focus_pad;
gtk_widget_style_get (widget,
"focus-line-width", &focus_width,
"focus-padding", &focus_pad,
NULL);
*minimum = priv->size + 2 * (focus_width + focus_pad);
*natural = priv->size + 2 * (focus_width + focus_pad);
}
static void
gtk_hsv_get_preferred_height (GtkWidget *widget,
gint *minimum,
gint *natural)
{
GtkHSV *hsv = GTK_HSV (widget);
GtkHSVPrivate *priv = hsv->priv;
gint focus_width;
gint focus_pad;
gtk_widget_style_get (widget,
"focus-line-width", &focus_width,
"focus-padding", &focus_pad,
NULL);
*minimum = priv->size + 2 * (focus_width + focus_pad);
*natural = priv->size + 2 * (focus_width + focus_pad);
}
static void
gtk_hsv_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GtkHSV *hsv = GTK_HSV (widget);
GtkHSVPrivate *priv = hsv->priv;
gtk_widget_set_allocation (widget, allocation);
if (gtk_widget_get_realized (widget))
gdk_window_move_resize (priv->window,
allocation->x,
allocation->y,
allocation->width,
allocation->height);
}
/* Utility functions */
#define INTENSITY(r, g, b) ((r) * 0.30 + (g) * 0.59 + (b) * 0.11)
/* Converts from HSV to RGB */
static void
hsv_to_rgb (gdouble *h,
gdouble *s,
gdouble *v)
{
gdouble hue, saturation, value;
gdouble f, p, q, t;
if (*s == 0.0)
{
*h = *v;
*s = *v;
*v = *v; /* heh */
}
else
{
hue = *h * 6.0;
saturation = *s;
value = *v;
if (hue == 6.0)
hue = 0.0;
f = hue - (int) hue;
p = value * (1.0 - saturation);
q = value * (1.0 - saturation * f);
t = value * (1.0 - saturation * (1.0 - f));
switch ((int) hue)
{
case 0:
*h = value;
*s = t;
*v = p;
break;
case 1:
*h = q;
*s = value;
*v = p;
break;
case 2:
*h = p;
*s = value;
*v = t;
break;
case 3:
*h = p;
*s = q;
*v = value;
break;
case 4:
*h = t;
*s = p;
*v = value;
break;
case 5:
*h = value;
*s = p;
*v = q;
break;
default:
g_assert_not_reached ();
}
}
}
/* Converts from RGB to HSV */
static void
rgb_to_hsv (gdouble *r,
gdouble *g,
gdouble *b)
{
gdouble red, green, blue;
gdouble h, s, v;
gdouble min, max;
gdouble delta;
red = *r;
green = *g;
blue = *b;
h = 0.0;
if (red > green)
{
if (red > blue)
max = red;
else
max = blue;
if (green < blue)
min = green;
else
min = blue;
}
else
{
if (green > blue)
max = green;
else
max = blue;
if (red < blue)
min = red;
else
min = blue;
}
v = max;
if (max != 0.0)
s = (max - min) / max;
else
s = 0.0;
if (s == 0.0)
h = 0.0;
else
{
delta = max - min;
if (red == max)
h = (green - blue) / delta;
else if (green == max)
h = 2 + (blue - red) / delta;
else if (blue == max)
h = 4 + (red - green) / delta;
h /= 6.0;
if (h < 0.0)
h += 1.0;
else if (h > 1.0)
h -= 1.0;
}
*r = h;
*g = s;
*b = v;
}
/* Computes the vertices of the saturation/value triangle */
static void
compute_triangle (GtkHSV *hsv,
gint *hx,
gint *hy,
gint *sx,
gint *sy,
gint *vx,
gint *vy)
{
GtkHSVPrivate *priv = hsv->priv;
GtkWidget *widget = GTK_WIDGET (hsv);
gdouble center_x;
gdouble center_y;
gdouble inner, outer;
gdouble angle;
center_x = gtk_widget_get_allocated_width (widget) / 2.0;
center_y = gtk_widget_get_allocated_height (widget) / 2.0;
outer = priv->size / 2.0;
inner = outer - priv->ring_width;
angle = priv->h * 2.0 * G_PI;
*hx = floor (center_x + cos (angle) * inner + 0.5);
*hy = floor (center_y - sin (angle) * inner + 0.5);
*sx = floor (center_x + cos (angle + 2.0 * G_PI / 3.0) * inner + 0.5);
*sy = floor (center_y - sin (angle + 2.0 * G_PI / 3.0) * inner + 0.5);
*vx = floor (center_x + cos (angle + 4.0 * G_PI / 3.0) * inner + 0.5);
*vy = floor (center_y - sin (angle + 4.0 * G_PI / 3.0) * inner + 0.5);
}
/* Computes whether a point is inside the hue ring */
static gboolean
is_in_ring (GtkHSV *hsv,
gdouble x,
gdouble y)
{
GtkHSVPrivate *priv = hsv->priv;
GtkWidget *widget = GTK_WIDGET (hsv);
gdouble dx, dy, dist;
gdouble center_x;
gdouble center_y;
gdouble inner, outer;
center_x = gtk_widget_get_allocated_width (widget) / 2.0;
center_y = gtk_widget_get_allocated_height (widget) / 2.0;
outer = priv->size / 2.0;
inner = outer - priv->ring_width;
dx = x - center_x;
dy = center_y - y;
dist = dx * dx + dy * dy;
return (dist >= inner * inner && dist <= outer * outer);
}
/* Computes a saturation/value pair based on the mouse coordinates */
static void
compute_sv (GtkHSV *hsv,
gdouble x,
gdouble y,
gdouble *s,
gdouble *v)
{
GtkWidget *widget = GTK_WIDGET (hsv);
int ihx, ihy, isx, isy, ivx, ivy;
double hx, hy, sx, sy, vx, vy;
double center_x;
double center_y;
compute_triangle (hsv, &ihx, &ihy, &isx, &isy, &ivx, &ivy);
center_x = gtk_widget_get_allocated_width (widget) / 2.0;
center_y = gtk_widget_get_allocated_height (widget) / 2.0;
hx = ihx - center_x;
hy = center_y - ihy;
sx = isx - center_x;
sy = center_y - isy;
vx = ivx - center_x;
vy = center_y - ivy;
x -= center_x;
y = center_y - y;
if (vx * (x - sx) + vy * (y - sy) < 0.0)
{
*s = 1.0;
*v = (((x - sx) * (hx - sx) + (y - sy) * (hy-sy))
/ ((hx - sx) * (hx - sx) + (hy - sy) * (hy - sy)));
if (*v < 0.0)
*v = 0.0;
else if (*v > 1.0)
*v = 1.0;
}
else if (hx * (x - sx) + hy * (y - sy) < 0.0)
{
*s = 0.0;
*v = (((x - sx) * (vx - sx) + (y - sy) * (vy - sy))
/ ((vx - sx) * (vx - sx) + (vy - sy) * (vy - sy)));
if (*v < 0.0)
*v = 0.0;
else if (*v > 1.0)
*v = 1.0;
}
else if (sx * (x - hx) + sy * (y - hy) < 0.0)
{
*v = 1.0;
*s = (((x - vx) * (hx - vx) + (y - vy) * (hy - vy)) /
((hx - vx) * (hx - vx) + (hy - vy) * (hy - vy)));
if (*s < 0.0)
*s = 0.0;
else if (*s > 1.0)
*s = 1.0;
}
else
{
*v = (((x - sx) * (hy - vy) - (y - sy) * (hx - vx))
/ ((vx - sx) * (hy - vy) - (vy - sy) * (hx - vx)));
if (*v<= 0.0)
{
*v = 0.0;
*s = 0.0;
}
else
{
if (*v > 1.0)
*v = 1.0;
if (fabs (hy - vy) < fabs (hx - vx))
*s = (x - sx - *v * (vx - sx)) / (*v * (hx - vx));
else
*s = (y - sy - *v * (vy - sy)) / (*v * (hy - vy));
if (*s < 0.0)
*s = 0.0;
else if (*s > 1.0)
*s = 1.0;
}
}
}
/* Computes whether a point is inside the saturation/value triangle */
static gboolean
is_in_triangle (GtkHSV *hsv,
gdouble x,
gdouble y)
{
int hx, hy, sx, sy, vx, vy;
double det, s, v;
compute_triangle (hsv, &hx, &hy, &sx, &sy, &vx, &vy);
det = (vx - sx) * (hy - sy) - (vy - sy) * (hx - sx);
s = ((x - sx) * (hy - sy) - (y - sy) * (hx - sx)) / det;
v = ((vx - sx) * (y - sy) - (vy - sy) * (x - sx)) / det;
return (s >= 0.0 && v >= 0.0 && s + v <= 1.0);
}
/* Computes a value based on the mouse coordinates */
static double
compute_v (GtkHSV *hsv,
gdouble x,
gdouble y)
{
GtkWidget *widget = GTK_WIDGET (hsv);
double center_x;
double center_y;
double dx, dy;
double angle;
center_x = gtk_widget_get_allocated_width (widget) / 2.0;
center_y = gtk_widget_get_allocated_height (widget) / 2.0;
dx = x - center_x;
dy = center_y - y;
angle = atan2 (dy, dx);
if (angle < 0.0)
angle += 2.0 * G_PI;
return angle / (2.0 * G_PI);
}
/* Event handlers */
static void
set_cross_grab (GtkHSV *hsv,
GdkDevice *device,
guint32 time)
{
GtkHSVPrivate *priv = hsv->priv;
GdkCursor *cursor;
cursor = gdk_cursor_new_for_display (gtk_widget_get_display (GTK_WIDGET (hsv)),
GDK_CROSSHAIR);
gdk_device_grab (device,
priv->window,
GDK_OWNERSHIP_NONE,
FALSE,
GDK_POINTER_MOTION_MASK
| GDK_POINTER_MOTION_HINT_MASK
| GDK_BUTTON_RELEASE_MASK,
cursor,
time);
g_object_unref (cursor);
}
static gboolean
gtk_hsv_grab_broken (GtkWidget *widget,
GdkEventGrabBroken *event)
{
GtkHSV *hsv = GTK_HSV (widget);
GtkHSVPrivate *priv = hsv->priv;
priv->mode = DRAG_NONE;
return TRUE;
}
static gint
gtk_hsv_button_press (GtkWidget *widget,
GdkEventButton *event)
{
GtkHSV *hsv = GTK_HSV (widget);
GtkHSVPrivate *priv = hsv->priv;
double x, y;
if (priv->mode != DRAG_NONE || event->button != 1)
return FALSE;
x = event->x;
y = event->y;
if (is_in_ring (hsv, x, y))
{
priv->mode = DRAG_H;
set_cross_grab (hsv, gdk_event_get_device ((GdkEvent *) event), event->time);
gtk_hsv_set_color (hsv,
compute_v (hsv, x, y),
priv->s,
priv->v);
gtk_widget_grab_focus (widget);
priv->focus_on_ring = TRUE;
return TRUE;
}
if (is_in_triangle (hsv, x, y))
{
gdouble s, v;
priv->mode = DRAG_SV;
set_cross_grab (hsv, gdk_event_get_device ((GdkEvent *) event), event->time);
compute_sv (hsv, x, y, &s, &v);
gtk_hsv_set_color (hsv, priv->h, s, v);
gtk_widget_grab_focus (widget);
priv->focus_on_ring = FALSE;
return TRUE;
}
return FALSE;
}
static gint
gtk_hsv_button_release (GtkWidget *widget,
GdkEventButton *event)
{
GtkHSV *hsv = GTK_HSV (widget);
GtkHSVPrivate *priv = hsv->priv;
DragMode mode;
gdouble x, y;
if (priv->mode == DRAG_NONE || event->button != 1)
return FALSE;
/* Set the drag mode to DRAG_NONE so that signal handlers for "catched"
* can see that this is the final color state.
*/
mode = priv->mode;
priv->mode = DRAG_NONE;
x = event->x;
y = event->y;
if (mode == DRAG_H)
{
gtk_hsv_set_color (hsv, compute_v (hsv, x, y), priv->s, priv->v);
}
else if (mode == DRAG_SV)
{
gdouble s, v;
compute_sv (hsv, x, y, &s, &v);
gtk_hsv_set_color (hsv, priv->h, s, v);
}
else
{
g_assert_not_reached ();
}
gdk_device_ungrab (gdk_event_get_device ((GdkEvent *) event), event->time);
return TRUE;
}
static gint
gtk_hsv_motion (GtkWidget *widget,
GdkEventMotion *event)
{
GtkHSV *hsv = GTK_HSV (widget);
GtkHSVPrivate *priv = hsv->priv;
gdouble x, y;
if (priv->mode == DRAG_NONE)
return FALSE;
gdk_event_request_motions (event);
x = event->x;
y = event->y;
if (priv->mode == DRAG_H)
{
gtk_hsv_set_color (hsv, compute_v (hsv, x, y), priv->s, priv->v);
return TRUE;
}
else if (priv->mode == DRAG_SV)
{
gdouble s, v;
compute_sv (hsv, x, y, &s, &v);
gtk_hsv_set_color (hsv, priv->h, s, v);
return TRUE;
}
g_assert_not_reached ();
return FALSE;
}
/* Redrawing */
/* Paints the hue ring */
static void
paint_ring (GtkHSV *hsv,
cairo_t *cr)
{
GtkHSVPrivate *priv = hsv->priv;
GtkWidget *widget = GTK_WIDGET (hsv);
int xx, yy, width, height;
gdouble dx, dy, dist;
gdouble center_x;
gdouble center_y;
gdouble inner, outer;
guint32 *buf, *p;
gdouble angle;
gdouble hue;
gdouble r, g, b;
cairo_surface_t *source;
cairo_t *source_cr;
gint stride;
width = gtk_widget_get_allocated_width (widget);
height = gtk_widget_get_allocated_height (widget);
center_x = width / 2.0;
center_y = height / 2.0;
outer = priv->size / 2.0;
inner = outer - priv->ring_width;
/* Create an image initialized with the ring colors */
stride = cairo_format_stride_for_width (CAIRO_FORMAT_RGB24, width);
buf = g_new (guint32, height * stride / 4);
for (yy = 0; yy < height; yy++)
{
p = buf + yy * width;
dy = -(yy - center_y);
for (xx = 0; xx < width; xx++)
{
dx = xx - center_x;
dist = dx * dx + dy * dy;
if (dist < ((inner-1) * (inner-1)) || dist > ((outer+1) * (outer+1)))
{
*p++ = 0;
continue;
}
angle = atan2 (dy, dx);
if (angle < 0.0)
angle += 2.0 * G_PI;
hue = angle / (2.0 * G_PI);
r = hue;
g = 1.0;
b = 1.0;
hsv_to_rgb (&r, &g, &b);
*p++ = (((int)floor (r * 255 + 0.5) << 16) |
((int)floor (g * 255 + 0.5) << 8) |
(int)floor (b * 255 + 0.5));
}
}
source = cairo_image_surface_create_for_data ((unsigned char *)buf,
CAIRO_FORMAT_RGB24,
width, height, stride);
/* Now draw the value marker onto the source image, so that it
* will get properly clipped at the edges of the ring
*/
source_cr = cairo_create (source);
r = priv->h;
g = 1.0;
b = 1.0;
hsv_to_rgb (&r, &g, &b);
if (INTENSITY (r, g, b) > 0.5)
cairo_set_source_rgb (source_cr, 0., 0., 0.);
else
cairo_set_source_rgb (source_cr, 1., 1., 1.);
cairo_move_to (source_cr, center_x, center_y);
cairo_line_to (source_cr,
center_x + cos (priv->h * 2.0 * G_PI) * priv->size / 2,
center_y - sin (priv->h * 2.0 * G_PI) * priv->size / 2);
cairo_stroke (source_cr);
cairo_destroy (source_cr);
/* Draw the ring using the source image */
cairo_save (cr);
cairo_set_source_surface (cr, source, 0, 0);
cairo_surface_destroy (source);
cairo_set_line_width (cr, priv->ring_width);
cairo_new_path (cr);
cairo_arc (cr,
center_x, center_y,
priv->size / 2. - priv->ring_width / 2.,
0, 2 * G_PI);
cairo_stroke (cr);
cairo_restore (cr);
g_free (buf);
}
/* Converts an HSV triplet to an integer RGB triplet */
static void
get_color (gdouble h,
gdouble s,
gdouble v,
gint *r,
gint *g,
gint *b)
{
hsv_to_rgb (&h, &s, &v);
*r = floor (h * 255 + 0.5);
*g = floor (s * 255 + 0.5);
*b = floor (v * 255 + 0.5);
}
#define SWAP(a, b, t) ((t) = (a), (a) = (b), (b) = (t))
#define LERP(a, b, v1, v2, i) (((v2) - (v1) != 0) \
? ((a) + ((b) - (a)) * ((i) - (v1)) / ((v2) - (v1))) \
: (a))
/* Number of pixels we extend out from the edges when creating
* color source to avoid artifacts
*/
#define PAD 3
/* Paints the HSV triangle */
static void
paint_triangle (GtkHSV *hsv,
cairo_t *cr,
gboolean draw_focus)
{
GtkHSVPrivate *priv = hsv->priv;
GtkWidget *widget = GTK_WIDGET (hsv);
gint hx, hy, sx, sy, vx, vy; /* HSV vertices */
gint x1, y1, r1, g1, b1; /* First vertex in scanline order */
gint x2, y2, r2, g2, b2; /* Second vertex */
gint x3, y3, r3, g3, b3; /* Third vertex */
gint t;
guint32 *buf, *p, c;
gint xl, xr, rl, rr, gl, gr, bl, br; /* Scanline data */
gint xx, yy;
gint x_interp, y_interp;
gint x_start, x_end;
cairo_surface_t *source;
gdouble r, g, b;
gint stride;
int width, height;
GtkStyleContext *context;
GtkStateFlags state;
priv = hsv->priv;
width = gtk_widget_get_allocated_width (widget);
height = gtk_widget_get_allocated_height (widget);
/* Compute triangle's vertices */
compute_triangle (hsv, &hx, &hy, &sx, &sy, &vx, &vy);
x1 = hx;
y1 = hy;
get_color (priv->h, 1.0, 1.0, &r1, &g1, &b1);
x2 = sx;
y2 = sy;
get_color (priv->h, 1.0, 0.0, &r2, &g2, &b2);
x3 = vx;
y3 = vy;
get_color (priv->h, 0.0, 1.0, &r3, &g3, &b3);
if (y2 > y3)
{
SWAP (x2, x3, t);
SWAP (y2, y3, t);
SWAP (r2, r3, t);
SWAP (g2, g3, t);
SWAP (b2, b3, t);
}
if (y1 > y3)
{
SWAP (x1, x3, t);
SWAP (y1, y3, t);
SWAP (r1, r3, t);
SWAP (g1, g3, t);
SWAP (b1, b3, t);
}
if (y1 > y2)
{
SWAP (x1, x2, t);
SWAP (y1, y2, t);
SWAP (r1, r2, t);
SWAP (g1, g2, t);
SWAP (b1, b2, t);
}
/* Shade the triangle */
stride = cairo_format_stride_for_width (CAIRO_FORMAT_RGB24, width);
buf = g_new (guint32, height * stride / 4);
for (yy = 0; yy < height; yy++)
{
p = buf + yy * width;
if (yy >= y1 - PAD && yy < y3 + PAD) {
y_interp = CLAMP (yy, y1, y3);
if (y_interp < y2)
{
xl = LERP (x1, x2, y1, y2, y_interp);
rl = LERP (r1, r2, y1, y2, y_interp);
gl = LERP (g1, g2, y1, y2, y_interp);
bl = LERP (b1, b2, y1, y2, y_interp);
}
else
{
xl = LERP (x2, x3, y2, y3, y_interp);
rl = LERP (r2, r3, y2, y3, y_interp);
gl = LERP (g2, g3, y2, y3, y_interp);
bl = LERP (b2, b3, y2, y3, y_interp);
}
xr = LERP (x1, x3, y1, y3, y_interp);
rr = LERP (r1, r3, y1, y3, y_interp);
gr = LERP (g1, g3, y1, y3, y_interp);
br = LERP (b1, b3, y1, y3, y_interp);
if (xl > xr)
{
SWAP (xl, xr, t);
SWAP (rl, rr, t);
SWAP (gl, gr, t);
SWAP (bl, br, t);
}
x_start = MAX (xl - PAD, 0);
x_end = MIN (xr + PAD, width);
x_start = MIN (x_start, x_end);
c = (rl << 16) | (gl << 8) | bl;
for (xx = 0; xx < x_start; xx++)
*p++ = c;
for (; xx < x_end; xx++)
{
x_interp = CLAMP (xx, xl, xr);
*p++ = ((LERP (rl, rr, xl, xr, x_interp) << 16) |
(LERP (gl, gr, xl, xr, x_interp) << 8) |
LERP (bl, br, xl, xr, x_interp));
}
c = (rr << 16) | (gr << 8) | br;
for (; xx < width; xx++)
*p++ = c;
}
}
source = cairo_image_surface_create_for_data ((unsigned char *)buf,
CAIRO_FORMAT_RGB24,
width, height, stride);
/* Draw a triangle with the image as a source */
cairo_set_source_surface (cr, source, 0, 0);
cairo_surface_destroy (source);
cairo_move_to (cr, x1, y1);
cairo_line_to (cr, x2, y2);
cairo_line_to (cr, x3, y3);
cairo_close_path (cr);
cairo_fill (cr);
g_free (buf);
/* Draw value marker */
xx = floor (sx + (vx - sx) * priv->v + (hx - vx) * priv->s * priv->v + 0.5);
yy = floor (sy + (vy - sy) * priv->v + (hy - vy) * priv->s * priv->v + 0.5);
r = priv->h;
g = priv->s;
b = priv->v;
hsv_to_rgb (&r, &g, &b);
context = gtk_widget_get_style_context (widget);
gtk_style_context_save (context);
state = gtk_widget_get_state_flags (widget);
gtk_style_context_set_state (context, state);
if (INTENSITY (r, g, b) > 0.5)
{
gtk_style_context_add_class (context, "light-area-focus");
cairo_set_source_rgb (cr, 0., 0., 0.);
}
else
{
gtk_style_context_add_class (context, "dark-area-focus");
cairo_set_source_rgb (cr, 1., 1., 1.);
}
#define RADIUS 4
#define FOCUS_RADIUS 6
cairo_new_path (cr);
cairo_arc (cr, xx, yy, RADIUS, 0, 2 * G_PI);
cairo_stroke (cr);
/* Draw focus outline */
if (draw_focus && !priv->focus_on_ring)
{
gint focus_width;
gint focus_pad;
gtk_widget_style_get (widget,
"focus-line-width", &focus_width,
"focus-padding", &focus_pad,
NULL);
gtk_render_focus (context, cr,
xx - FOCUS_RADIUS - focus_width - focus_pad,
yy - FOCUS_RADIUS - focus_width - focus_pad,
2 * (FOCUS_RADIUS + focus_width + focus_pad),
2 * (FOCUS_RADIUS + focus_width + focus_pad));
}
gtk_style_context_restore (context);
}
/* Paints the contents of the HSV color selector */
static gboolean
gtk_hsv_draw (GtkWidget *widget,
cairo_t *cr)
{
GtkHSV *hsv = GTK_HSV (widget);
GtkHSVPrivate *priv = hsv->priv;
gboolean draw_focus;
draw_focus = gtk_widget_has_visible_focus (widget);
paint_ring (hsv, cr);
paint_triangle (hsv, cr, draw_focus);
if (draw_focus && priv->focus_on_ring)
{
GtkStyleContext *context;
GtkStateFlags state;
context = gtk_widget_get_style_context (widget);
state = gtk_widget_get_state_flags (widget);
gtk_style_context_save (context);
gtk_style_context_set_state (context, state);
gtk_render_focus (context, cr, 0, 0,
gtk_widget_get_allocated_width (widget),
gtk_widget_get_allocated_height (widget));
gtk_style_context_restore (context);
}
return FALSE;
}
static gboolean
gtk_hsv_focus (GtkWidget *widget,
GtkDirectionType dir)
{
GtkHSV *hsv = GTK_HSV (widget);
GtkHSVPrivate *priv = hsv->priv;
if (!gtk_widget_has_focus (widget))
{
if (dir == GTK_DIR_TAB_BACKWARD)
priv->focus_on_ring = FALSE;
else
priv->focus_on_ring = TRUE;
gtk_widget_grab_focus (GTK_WIDGET (hsv));
return TRUE;
}
switch (dir)
{
case GTK_DIR_UP:
if (priv->focus_on_ring)
return FALSE;
else
priv->focus_on_ring = TRUE;
break;
case GTK_DIR_DOWN:
if (priv->focus_on_ring)
priv->focus_on_ring = FALSE;
else
return FALSE;
break;
case GTK_DIR_LEFT:
case GTK_DIR_TAB_BACKWARD:
if (priv->focus_on_ring)
return FALSE;
else
priv->focus_on_ring = TRUE;
break;
case GTK_DIR_RIGHT:
case GTK_DIR_TAB_FORWARD:
if (priv->focus_on_ring)
priv->focus_on_ring = FALSE;
else
return FALSE;
break;
}
gtk_widget_queue_draw (GTK_WIDGET (hsv));
return TRUE;
}
/**
* gtk_hsv_new:
*
* Creates a new HSV color selector.
*
* Return value: A newly-created HSV color selector.
*
* Since: 2.14
*/
GtkWidget*
gtk_hsv_new (void)
{
return g_object_new (GTK_TYPE_HSV, NULL);
}
/**
* gtk_hsv_set_color:
* @hsv: An HSV color selector
* @h: Hue
* @s: Saturation
* @v: Value
*
* Sets the current color in an HSV color selector.
* Color component values must be in the [0.0, 1.0] range.
*
* Since: 2.14
*/
void
gtk_hsv_set_color (GtkHSV *hsv,
gdouble h,
gdouble s,
gdouble v)
{
GtkHSVPrivate *priv;
g_return_if_fail (GTK_IS_HSV (hsv));
g_return_if_fail (h >= 0.0 && h <= 1.0);
g_return_if_fail (s >= 0.0 && s <= 1.0);
g_return_if_fail (v >= 0.0 && v <= 1.0);
priv = hsv->priv;
priv->h = h;
priv->s = s;
priv->v = v;
g_signal_emit (hsv, hsv_signals[CHANGED], 0);
gtk_widget_queue_draw (GTK_WIDGET (hsv));
}
/**
* gtk_hsv_get_color:
* @hsv: An HSV color selector
* @h: (out): Return value for the hue
* @s: (out): Return value for the saturation
* @v: (out): Return value for the value
*
* Queries the current color in an HSV color selector.
* Returned values will be in the [0.0, 1.0] range.
*
* Since: 2.14
*/
void
gtk_hsv_get_color (GtkHSV *hsv,
double *h,
double *s,
double *v)
{
GtkHSVPrivate *priv;
g_return_if_fail (GTK_IS_HSV (hsv));
priv = hsv->priv;
if (h)
*h = priv->h;
if (s)
*s = priv->s;
if (v)
*v = priv->v;
}
/**
* gtk_hsv_set_metrics:
* @hsv: An HSV color selector
* @size: Diameter for the hue ring
* @ring_width: Width of the hue ring
*
* Sets the size and ring width of an HSV color selector.
*
* Since: 2.14
*/
void
gtk_hsv_set_metrics (GtkHSV *hsv,
gint size,
gint ring_width)
{
GtkHSVPrivate *priv;
int same_size;
g_return_if_fail (GTK_IS_HSV (hsv));
g_return_if_fail (size > 0);
g_return_if_fail (ring_width > 0);
g_return_if_fail (2 * ring_width + 1 <= size);
priv = hsv->priv;
same_size = (priv->size == size);
priv->size = size;
priv->ring_width = ring_width;
if (same_size)
gtk_widget_queue_draw (GTK_WIDGET (hsv));
else
gtk_widget_queue_resize (GTK_WIDGET (hsv));
}
/**
* gtk_hsv_get_metrics:
* @hsv: An HSV color selector
* @size: (out): Return value for the diameter of the hue ring
* @ring_width: (out): Return value for the width of the hue ring
*
* Queries the size and ring width of an HSV color selector.
*
* Since: 2.14
*/
void
gtk_hsv_get_metrics (GtkHSV *hsv,
gint *size,
gint *ring_width)
{
GtkHSVPrivate *priv;
g_return_if_fail (GTK_IS_HSV (hsv));
priv = hsv->priv;
if (size)
*size = priv->size;
if (ring_width)
*ring_width = priv->ring_width;
}
/**
* gtk_hsv_is_adjusting:
* @hsv: A #GtkHSV
*
* An HSV color selector can be said to be adjusting if multiple rapid
* changes are being made to its value, for example, when the user is
* adjusting the value with the mouse. This function queries whether
* the HSV color selector is being adjusted or not.
*
* Return value: %TRUE if clients can ignore changes to the color value,
* since they may be transitory, or %FALSE if they should consider
* the color value status to be final.
*
* Since: 2.14
*/
gboolean
gtk_hsv_is_adjusting (GtkHSV *hsv)
{
GtkHSVPrivate *priv;
g_return_val_if_fail (GTK_IS_HSV (hsv), FALSE);
priv = hsv->priv;
return priv->mode != DRAG_NONE;
}
/**
* gtk_hsv_to_rgb:
* @h: Hue
* @s: Saturation
* @v: Value
* @r: (out): Return value for the red component
* @g: (out): Return value for the green component
* @b: (out): Return value for the blue component
*
* Converts a color from HSV space to RGB.
* Input values must be in the [0.0, 1.0] range;
* output values will be in the same range.
*
* Since: 2.14
*/
void
gtk_hsv_to_rgb (gdouble h,
gdouble s,
gdouble v,
gdouble *r,
gdouble *g,
gdouble *b)
{
g_return_if_fail (h >= 0.0 && h <= 1.0);
g_return_if_fail (s >= 0.0 && s <= 1.0);
g_return_if_fail (v >= 0.0 && v <= 1.0);
hsv_to_rgb (&h, &s, &v);
if (r)
*r = h;
if (g)
*g = s;
if (b)
*b = v;
}
/**
* gtk_rgb_to_hsv:
* @r: Red
* @g: Green
* @b: Blue
* @h: (out): Return value for the hue component
* @s: (out): Return value for the saturation component
* @v: (out): Return value for the value component
*
* Converts a color from RGB space to HSV.
* Input values must be in the [0.0, 1.0] range;
* output values will be in the same range.
*
* Since: 2.14
*/
void
gtk_rgb_to_hsv (gdouble r,
gdouble g,
gdouble b,
gdouble *h,
gdouble *s,
gdouble *v)
{
g_return_if_fail (r >= 0.0 && r <= 1.0);
g_return_if_fail (g >= 0.0 && g <= 1.0);
g_return_if_fail (b >= 0.0 && b <= 1.0);
rgb_to_hsv (&r, &g, &b);
if (h)
*h = r;
if (s)
*s = g;
if (v)
*v = b;
}
static void
gtk_hsv_move (GtkHSV *hsv,
GtkDirectionType dir)
{
GtkHSVPrivate *priv = hsv->priv;
gdouble hue, sat, val;
gint hx, hy, sx, sy, vx, vy; /* HSV vertices */
gint x, y; /* position in triangle */
hue = priv->h;
sat = priv->s;
val = priv->v;
compute_triangle (hsv, &hx, &hy, &sx, &sy, &vx, &vy);
x = floor (sx + (vx - sx) * priv->v + (hx - vx) * priv->s * priv->v + 0.5);
y = floor (sy + (vy - sy) * priv->v + (hy - vy) * priv->s * priv->v + 0.5);
#define HUE_DELTA 0.002
switch (dir)
{
case GTK_DIR_UP:
if (priv->focus_on_ring)
hue += HUE_DELTA;
else
{
y -= 1;
compute_sv (hsv, x, y, &sat, &val);
}
break;
case GTK_DIR_DOWN:
if (priv->focus_on_ring)
hue -= HUE_DELTA;
else
{
y += 1;
compute_sv (hsv, x, y, &sat, &val);
}
break;
case GTK_DIR_LEFT:
if (priv->focus_on_ring)
hue += HUE_DELTA;
else
{
x -= 1;
compute_sv (hsv, x, y, &sat, &val);
}
break;
case GTK_DIR_RIGHT:
if (priv->focus_on_ring)
hue -= HUE_DELTA
;
else
{
x += 1;
compute_sv (hsv, x, y, &sat, &val);
}
break;
default:
/* we don't care about the tab directions */
break;
}
/* Wrap */
if (hue < 0.0)
hue = 1.0;
else if (hue > 1.0)
hue = 0.0;
gtk_hsv_set_color (hsv, hue, sat, val);
}
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