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PIKApp/modules/pikacolorwheel.c

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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+)
* Michael Natterer <mitch@gimp.org> (ported back to GIMP)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
/*
* 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 <gegl.h>
#include <gtk/gtk.h>
#include <gdk/gdkkeysyms.h>
#include <libpikaconfig/pikaconfig.h>
#include <libpikacolor/pikacolor.h>
#include <libpikamath/pikamath.h>
#include <libpikawidgets/pikawidgets.h>
#include "pikacolorwheel.h"
/* Default ring fraction */
#define DEFAULT_FRACTION 0.1
/* 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 PikaColorWheel structure */
typedef struct
{
/* Color value */
gdouble h;
gdouble s;
gdouble v;
/* ring_width is this fraction of size */
gdouble ring_fraction;
/* Size and ring width */
gint size;
gint ring_width;
/* Window for capturing events */
GdkWindow *window;
/* Dragging mode */
DragMode mode;
guint focus_on_ring : 1;
PikaColorConfig *config;
PikaColorTransform *transform;
} PikaColorWheelPrivate;
enum
{
CHANGED,
MOVE,
LAST_SIGNAL
};
static void pika_color_wheel_dispose (GObject *object);
static void pika_color_wheel_map (GtkWidget *widget);
static void pika_color_wheel_unmap (GtkWidget *widget);
static void pika_color_wheel_realize (GtkWidget *widget);
static void pika_color_wheel_unrealize (GtkWidget *widget);
static void pika_color_wheel_get_preferred_width (GtkWidget *widget,
gint *minimum,
gint *natural);
static void pika_color_wheel_get_preferred_height (GtkWidget *widget,
gint *minimum,
gint *natural);
static void pika_color_wheel_size_allocate (GtkWidget *widget,
GtkAllocation *allocation);
static gboolean pika_color_wheel_draw (GtkWidget *widget,
cairo_t *cr);
static gboolean pika_color_wheel_focus (GtkWidget *widget,
GtkDirectionType direction);
static void pika_color_wheel_move (PikaColorWheel *wheel,
GtkDirectionType dir);
static void pika_color_wheel_drag_begin (GtkGestureDrag *gesture,
gdouble start_x,
gdouble start_y,
gpointer user_data);
static void pika_color_wheel_drag_update (GtkGestureDrag *gesture,
gdouble offset_x,
gdouble offset_y,
gpointer user_data);
static void pika_color_wheel_drag_end (GtkGestureDrag *gesture,
gdouble offset_x,
gdouble offset_y,
gpointer user_data);
static void pika_color_wheel_drag_cancel (GtkGesture *gesture,
GdkEventSequence *sequence,
gpointer user_data);
static void pika_color_wheel_create_transform (PikaColorWheel *wheel);
static void pika_color_wheel_destroy_transform (PikaColorWheel *wheel);
static guint wheel_signals[LAST_SIGNAL];
G_DEFINE_DYNAMIC_TYPE_EXTENDED (PikaColorWheel, pika_color_wheel,
GTK_TYPE_WIDGET, 0,
G_ADD_PRIVATE_DYNAMIC (PikaColorWheel))
#define parent_class pika_color_wheel_parent_class
void
color_wheel_register_type (GTypeModule *module)
{
pika_color_wheel_register_type (module);
}
static void
pika_color_wheel_class_init (PikaColorWheelClass *class)
{
GObjectClass *object_class = G_OBJECT_CLASS (class);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
PikaColorWheelClass *wheel_class = PIKA_COLOR_WHEEL_CLASS (class);
GtkBindingSet *binding_set;
object_class->dispose = pika_color_wheel_dispose;
widget_class->map = pika_color_wheel_map;
widget_class->unmap = pika_color_wheel_unmap;
widget_class->realize = pika_color_wheel_realize;
widget_class->unrealize = pika_color_wheel_unrealize;
widget_class->get_preferred_width = pika_color_wheel_get_preferred_width;
widget_class->get_preferred_height = pika_color_wheel_get_preferred_height;
widget_class->size_allocate = pika_color_wheel_size_allocate;
widget_class->draw = pika_color_wheel_draw;
widget_class->focus = pika_color_wheel_focus;
wheel_class->move = pika_color_wheel_move;
wheel_signals[CHANGED] =
g_signal_new ("changed",
G_OBJECT_CLASS_TYPE (object_class),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (PikaColorWheelClass, changed),
NULL, NULL, NULL,
G_TYPE_NONE, 0);
wheel_signals[MOVE] =
g_signal_new ("move",
G_OBJECT_CLASS_TYPE (object_class),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_STRUCT_OFFSET (PikaColorWheelClass, move),
NULL, NULL, NULL,
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);
}
static void
pika_color_wheel_class_finalize (PikaColorWheelClass *klass)
{
}
static void
pika_color_wheel_init (PikaColorWheel *wheel)
{
PikaColorWheelPrivate *priv = pika_color_wheel_get_instance_private (wheel);
GtkGesture *gesture;
gtk_widget_set_has_window (GTK_WIDGET (wheel), FALSE);
gtk_widget_set_can_focus (GTK_WIDGET (wheel), TRUE);
priv->ring_fraction = DEFAULT_FRACTION;
priv->size = DEFAULT_SIZE;
priv->ring_width = DEFAULT_RING_WIDTH;
pika_widget_track_monitor (GTK_WIDGET (wheel),
G_CALLBACK (pika_color_wheel_destroy_transform),
NULL, NULL);
/* Allow the user to drag the rectangle on the preview */
gesture = gtk_gesture_drag_new (GTK_WIDGET (wheel));
g_signal_connect (gesture, "drag-begin",
G_CALLBACK (pika_color_wheel_drag_begin),
wheel);
g_signal_connect (gesture, "drag-update",
G_CALLBACK (pika_color_wheel_drag_update),
wheel);
g_signal_connect (gesture, "drag-end",
G_CALLBACK (pika_color_wheel_drag_end),
wheel);
g_signal_connect (gesture, "cancel",
G_CALLBACK (pika_color_wheel_drag_cancel),
wheel);
}
static void
pika_color_wheel_dispose (GObject *object)
{
PikaColorWheel *wheel = PIKA_COLOR_WHEEL (object);
pika_color_wheel_set_color_config (wheel, NULL);
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
pika_color_wheel_map (GtkWidget *widget)
{
PikaColorWheel *wheel = PIKA_COLOR_WHEEL (widget);
PikaColorWheelPrivate *priv = pika_color_wheel_get_instance_private (wheel);
GTK_WIDGET_CLASS (parent_class)->map (widget);
gdk_window_show (priv->window);
}
static void
pika_color_wheel_unmap (GtkWidget *widget)
{
PikaColorWheel *wheel = PIKA_COLOR_WHEEL (widget);
PikaColorWheelPrivate *priv = pika_color_wheel_get_instance_private (wheel);
gdk_window_hide (priv->window);
GTK_WIDGET_CLASS (parent_class)->unmap (widget);
}
static void
pika_color_wheel_realize (GtkWidget *widget)
{
PikaColorWheel *wheel = PIKA_COLOR_WHEEL (widget);
PikaColorWheelPrivate *priv = pika_color_wheel_get_instance_private (wheel);
GtkAllocation allocation;
GdkWindowAttr attr;
gint attr_mask;
GdkWindow *parent_window;
gtk_widget_get_allocation (widget, &allocation);
gtk_widget_set_realized (widget, TRUE);
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) |
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, wheel);
}
static void
pika_color_wheel_unrealize (GtkWidget *widget)
{
PikaColorWheel *wheel = PIKA_COLOR_WHEEL (widget);
PikaColorWheelPrivate *priv = pika_color_wheel_get_instance_private (wheel);
gdk_window_set_user_data (priv->window, NULL);
gdk_window_destroy (priv->window);
priv->window = NULL;
GTK_WIDGET_CLASS (parent_class)->unrealize (widget);
}
static void
pika_color_wheel_get_preferred_width (GtkWidget *widget,
gint *minimum,
gint *natural)
{
gint focus_width;
gint focus_pad;
gtk_widget_style_get (widget,
"focus-line-width", &focus_width,
"focus-padding", &focus_pad,
NULL);
*minimum = *natural = DEFAULT_SIZE + 2 * (focus_width + focus_pad);
}
static void
pika_color_wheel_get_preferred_height (GtkWidget *widget,
gint *minimum,
gint *natural)
{
gint focus_width;
gint focus_pad;
gtk_widget_style_get (widget,
"focus-line-width", &focus_width,
"focus-padding", &focus_pad,
NULL);
*minimum = *natural = DEFAULT_SIZE + 2 * (focus_width + focus_pad);
}
static void
pika_color_wheel_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
PikaColorWheel *wheel = PIKA_COLOR_WHEEL (widget);
PikaColorWheelPrivate *priv = pika_color_wheel_get_instance_private (wheel);
gint focus_width;
gint focus_pad;
GTK_WIDGET_CLASS (parent_class)->size_allocate (widget, allocation);
gtk_widget_style_get (widget,
"focus-line-width", &focus_width,
"focus-padding", &focus_pad,
NULL);
priv->size = MIN (allocation->width - 2 * (focus_width + focus_pad),
allocation->height - 2 * (focus_width + focus_pad));
priv->ring_width = priv->size * priv->ring_fraction;
if (gtk_widget_get_realized (widget))
gdk_window_move_resize (priv->window,
allocation->x,
allocation->y,
allocation->width,
allocation->height);
}
/* Utility functions */
/* 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 ();
}
}
}
/* Computes the vertices of the saturation/value triangle */
static void
compute_triangle (PikaColorWheel *wheel,
gint *hx,
gint *hy,
gint *sx,
gint *sy,
gint *vx,
gint *vy)
{
PikaColorWheelPrivate *priv = pika_color_wheel_get_instance_private (wheel);
GtkAllocation allocation;
gdouble center_x;
gdouble center_y;
gdouble inner, outer;
gdouble angle;
gtk_widget_get_allocation (GTK_WIDGET (wheel), &allocation);
center_x = allocation.width / 2.0;
center_y = allocation.height / 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 (PikaColorWheel *wheel,
gdouble x,
gdouble y)
{
PikaColorWheelPrivate *priv = pika_color_wheel_get_instance_private (wheel);
GtkAllocation allocation;
gdouble dx, dy, dist;
gdouble center_x;
gdouble center_y;
gdouble inner, outer;
gtk_widget_get_allocation (GTK_WIDGET (wheel), &allocation);
center_x = allocation.width / 2.0;
center_y = allocation.height / 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 (PikaColorWheel *wheel,
gdouble x,
gdouble y,
gdouble *s,
gdouble *v)
{
GtkAllocation allocation;
gint ihx, ihy, isx, isy, ivx, ivy;
gdouble hx, hy, sx, sy, vx, vy;
gdouble center_x;
gdouble center_y;
gtk_widget_get_allocation (GTK_WIDGET (wheel), &allocation);
compute_triangle (wheel, &ihx, &ihy, &isx, &isy, &ivx, &ivy);
center_x = allocation.width / 2.0;
center_y = allocation.height / 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 (PikaColorWheel *wheel,
gdouble x,
gdouble y)
{
gint hx, hy, sx, sy, vx, vy;
gdouble det, s, v;
compute_triangle (wheel, &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 (PikaColorWheel *wheel,
gdouble x,
gdouble y)
{
GtkAllocation allocation;
gdouble center_x;
gdouble center_y;
gdouble dx, dy;
gdouble angle;
gtk_widget_get_allocation (GTK_WIDGET (wheel), &allocation);
center_x = allocation.width / 2.0;
center_y = allocation.height / 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);
}
static void
pika_color_wheel_drag_begin (GtkGestureDrag *gesture,
gdouble start_x,
gdouble start_y,
gpointer user_data)
{
PikaColorWheel *wheel = PIKA_COLOR_WHEEL (user_data);
PikaColorWheelPrivate *priv = pika_color_wheel_get_instance_private (wheel);
GtkWidget *widget = GTK_WIDGET (wheel);
GdkCursor *cursor;
if (is_in_ring (wheel, start_x, start_y))
{
cursor = gdk_cursor_new_from_name (gtk_widget_get_display (widget),
"crosshair");
gdk_window_set_cursor (gtk_widget_get_window (widget), cursor);
g_object_unref (cursor);
priv->mode = DRAG_H;
pika_color_wheel_set_color (wheel,
compute_v (wheel, start_x, start_y),
priv->s,
priv->v);
gtk_widget_grab_focus (widget);
priv->focus_on_ring = TRUE;
}
else if (is_in_triangle (wheel, start_x, start_y))
{
gdouble s, v;
cursor = gdk_cursor_new_from_name (gtk_widget_get_display (widget),
"crosshair");
gdk_window_set_cursor (gtk_widget_get_window (widget), cursor);
g_object_unref (cursor);
priv->mode = DRAG_SV;
compute_sv (wheel, start_x, start_y, &s, &v);
pika_color_wheel_set_color (wheel, priv->h, s, v);
gtk_widget_grab_focus (widget);
priv->focus_on_ring = FALSE;
}
}
static void
pika_color_wheel_drag_update (GtkGestureDrag *gesture,
gdouble offset_x,
gdouble offset_y,
gpointer user_data)
{
PikaColorWheel *wheel = PIKA_COLOR_WHEEL (user_data);
PikaColorWheelPrivate *priv = pika_color_wheel_get_instance_private (wheel);
gdouble x, y;
gtk_gesture_drag_get_start_point (gesture, &x, &y);
x += offset_x;
y += offset_y;
if (priv->mode == DRAG_H)
{
pika_color_wheel_set_color (wheel,
compute_v (wheel, x, y), priv->s, priv->v);
}
else if (priv->mode == DRAG_SV)
{
gdouble s, v;
compute_sv (wheel, x, y, &s, &v);
pika_color_wheel_set_color (wheel, priv->h, s, v);
}
}
static void
pika_color_wheel_drag_end (GtkGestureDrag *gesture,
gdouble offset_x,
gdouble offset_y,
gpointer user_data)
{
PikaColorWheel *wheel = PIKA_COLOR_WHEEL (user_data);
PikaColorWheelPrivate *priv = pika_color_wheel_get_instance_private (wheel);
DragMode mode;
gdouble x, y;
/* 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;
gtk_gesture_drag_get_start_point (gesture, &x, &y);
x += offset_x;
y += offset_y;
if (mode == DRAG_H)
{
pika_color_wheel_set_color (wheel,
compute_v (wheel, x, y), priv->s, priv->v);
}
else if (mode == DRAG_SV)
{
gdouble s, v;
compute_sv (wheel, x, y, &s, &v);
pika_color_wheel_set_color (wheel, priv->h, s, v);
}
gdk_window_set_cursor (gtk_widget_get_window (GTK_WIDGET (wheel)), NULL);
}
static void
pika_color_wheel_drag_cancel (GtkGesture *gesture,
GdkEventSequence *sequence,
gpointer user_data)
{
PikaColorWheel *wheel = PIKA_COLOR_WHEEL (user_data);
PikaColorWheelPrivate *priv = pika_color_wheel_get_instance_private (wheel);
priv->mode = DRAG_NONE;
gdk_window_set_cursor (gtk_widget_get_window (GTK_WIDGET (wheel)), NULL);
}
/* Redrawing */
/* Paints the hue ring */
static void
paint_ring (PikaColorWheel *wheel,
cairo_t *cr)
{
GtkWidget *widget = GTK_WIDGET (wheel);
PikaColorWheelPrivate *priv = pika_color_wheel_get_instance_private (wheel);
gint width, height;
gint xx, yy;
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));
}
}
if (priv->transform)
{
const Babl *format = babl_format ("cairo-RGB24");
guchar *b = (guchar *) buf;
gint i;
for (i = 0; i < height; i++)
{
pika_color_transform_process_pixels (priv->transform,
format, b,
format, b,
width);
b += stride;
}
}
source = cairo_image_surface_create_for_data ((guchar *) 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 (PIKA_RGB_LUMINANCE (r, g, b) > 0.5)
cairo_set_source_rgb (source_cr, 0.0, 0.0, 0.0);
else
cairo_set_source_rgb (source_cr, 1.0, 1.0, 1.0);
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 / 2.0 - priv->ring_width / 2.0,
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 (PikaColorWheel *wheel,
cairo_t *cr,
gboolean draw_focus)
{
GtkWidget *widget = GTK_WIDGET (wheel);
PikaColorWheelPrivate *priv = pika_color_wheel_get_instance_private (wheel);
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;
gint width, height;
GtkStyleContext *context;
width = gtk_widget_get_allocated_width (widget);
height = gtk_widget_get_allocated_height (widget);
/* Compute triangle's vertices */
compute_triangle (wheel, &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;
}
}
if (priv->transform)
{
const Babl *format = babl_format ("cairo-RGB24");
guchar *b = (guchar *) buf;
gint i;
for (i = 0; i < height; i++)
{
pika_color_transform_process_pixels (priv->transform,
format, b,
format, b,
width);
b += stride;
}
}
source = cairo_image_surface_create_for_data ((guchar *) 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);
if (PIKA_RGB_LUMINANCE (r, g, b) > 0.5)
{
gtk_style_context_add_class (context, "light-area-focus");
cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
}
else
{
gtk_style_context_add_class (context, "dark-area-focus");
cairo_set_source_rgb (cr, 1.0, 1.0, 1.0);
}
#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);
}
static gboolean
pika_color_wheel_draw (GtkWidget *widget,
cairo_t *cr)
{
PikaColorWheel *wheel = PIKA_COLOR_WHEEL (widget);
PikaColorWheelPrivate *priv = pika_color_wheel_get_instance_private (wheel);
gboolean draw_focus;
draw_focus = gtk_widget_has_visible_focus (widget);
if (! priv->transform)
pika_color_wheel_create_transform (wheel);
paint_ring (wheel, cr);
paint_triangle (wheel, cr, draw_focus);
if (draw_focus && priv->focus_on_ring)
{
GtkStyleContext *context = gtk_widget_get_style_context (widget);
gtk_render_focus (context, cr, 0, 0,
gtk_widget_get_allocated_width (widget),
gtk_widget_get_allocated_height (widget));
}
return FALSE;
}
static gboolean
pika_color_wheel_focus (GtkWidget *widget,
GtkDirectionType dir)
{
PikaColorWheel *wheel = PIKA_COLOR_WHEEL (widget);
PikaColorWheelPrivate *priv = pika_color_wheel_get_instance_private (wheel);
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 (widget);
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 (widget);
return TRUE;
}
/**
* pika_color_wheel_new:
*
* Creates a new HSV color selector.
*
* Returns: A newly-created HSV color selector.
*
* Since: 2.10
*/
GtkWidget*
pika_color_wheel_new (void)
{
return g_object_new (PIKA_TYPE_COLOR_WHEEL, NULL);
}
/**
* pika_color_wheel_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: 2.10
*/
void
pika_color_wheel_set_color (PikaColorWheel *wheel,
gdouble h,
gdouble s,
gdouble v)
{
PikaColorWheelPrivate *priv = pika_color_wheel_get_instance_private (wheel);
g_return_if_fail (PIKA_IS_COLOR_WHEEL (wheel));
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->h = h;
priv->s = s;
priv->v = v;
g_signal_emit (wheel, wheel_signals[CHANGED], 0);
gtk_widget_queue_draw (GTK_WIDGET (wheel));
}
/**
* pika_color_wheel_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: 2.10
*/
void
pika_color_wheel_get_color (PikaColorWheel *wheel,
gdouble *h,
gdouble *s,
gdouble *v)
{
PikaColorWheelPrivate *priv = pika_color_wheel_get_instance_private (wheel);
g_return_if_fail (PIKA_IS_COLOR_WHEEL (wheel));
if (h) *h = priv->h;
if (s) *s = priv->s;
if (v) *v = priv->v;
}
/**
* pika_color_wheel_set_ring_fraction:
* @ring: A wheel color selector
* @fraction: Ring fraction
*
* Sets the ring fraction of a wheel color selector.
*
* Since: 2.10
*/
void
pika_color_wheel_set_ring_fraction (PikaColorWheel *hsv,
gdouble fraction)
{
PikaColorWheelPrivate *priv = pika_color_wheel_get_instance_private (hsv);
g_return_if_fail (PIKA_IS_COLOR_WHEEL (hsv));
priv->ring_fraction = CLAMP (fraction, 0.01, 0.99);
gtk_widget_queue_draw (GTK_WIDGET (hsv));
}
/**
* pika_color_wheel_get_ring_fraction:
* @ring: A wheel color selector
*
* Returns value: The ring fraction of the wheel color selector.
*
* Since: 2.10
*/
gdouble
pika_color_wheel_get_ring_fraction (PikaColorWheel *wheel)
{
PikaColorWheelPrivate *priv = pika_color_wheel_get_instance_private (wheel);
g_return_val_if_fail (PIKA_IS_COLOR_WHEEL (wheel), DEFAULT_FRACTION);
return priv->ring_fraction;
}
/**
* pika_color_wheel_set_color_config:
* @wheel: a #PikaColorWheel widget.
* @config: a #PikaColorConfig object.
*
* Sets the color management configuration to use with this color wheel.
*
* Since: 2.10
*/
void
pika_color_wheel_set_color_config (PikaColorWheel *wheel,
PikaColorConfig *config)
{
PikaColorWheelPrivate *priv = pika_color_wheel_get_instance_private (wheel);
g_return_if_fail (PIKA_IS_COLOR_WHEEL (wheel));
g_return_if_fail (config == NULL || PIKA_IS_COLOR_CONFIG (config));
if (config != priv->config)
{
if (priv->config)
{
g_signal_handlers_disconnect_by_func (priv->config,
pika_color_wheel_destroy_transform,
wheel);
pika_color_wheel_destroy_transform (wheel);
}
g_set_object (&priv->config, config);
if (priv->config)
{
g_signal_connect_swapped (priv->config, "notify",
G_CALLBACK (pika_color_wheel_destroy_transform),
wheel);
}
}
}
/**
* pika_color_wheel_is_adjusting:
* @hsv: A #PikaColorWheel
*
* 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.
*
* Returns: %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: 2.10
*/
gboolean
pika_color_wheel_is_adjusting (PikaColorWheel *wheel)
{
PikaColorWheelPrivate *priv = pika_color_wheel_get_instance_private (wheel);
g_return_val_if_fail (PIKA_IS_COLOR_WHEEL (wheel), FALSE);
return priv->mode != DRAG_NONE;
}
static void
pika_color_wheel_move (PikaColorWheel *wheel,
GtkDirectionType dir)
{
PikaColorWheelPrivate *priv = pika_color_wheel_get_instance_private (wheel);
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 (wheel, &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 (wheel, x, y, &sat, &val);
}
break;
case GTK_DIR_DOWN:
if (priv->focus_on_ring)
hue -= HUE_DELTA;
else
{
y += 1;
compute_sv (wheel, x, y, &sat, &val);
}
break;
case GTK_DIR_LEFT:
if (priv->focus_on_ring)
hue += HUE_DELTA;
else
{
x -= 1;
compute_sv (wheel, x, y, &sat, &val);
}
break;
case GTK_DIR_RIGHT:
if (priv->focus_on_ring)
hue -= HUE_DELTA
;
else
{
x += 1;
compute_sv (wheel, 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;
pika_color_wheel_set_color (wheel, hue, sat, val);
}
static void
pika_color_wheel_create_transform (PikaColorWheel *wheel)
{
PikaColorWheelPrivate *priv = pika_color_wheel_get_instance_private (wheel);
if (priv->config)
{
static PikaColorProfile *profile = NULL;
const Babl *format = babl_format ("cairo-RGB24");
if (G_UNLIKELY (! profile))
profile = pika_color_profile_new_rgb_srgb ();
priv->transform = pika_widget_get_color_transform (GTK_WIDGET (wheel),
priv->config,
profile,
format,
format,
NULL,
PIKA_COLOR_RENDERING_INTENT_RELATIVE_COLORIMETRIC,
FALSE);
}
}
static void
pika_color_wheel_destroy_transform (PikaColorWheel *wheel)
{
PikaColorWheelPrivate *priv = pika_color_wheel_get_instance_private (wheel);
if (priv->transform)
{
g_object_unref (priv->transform);
priv->transform = NULL;
}
gtk_widget_queue_draw (GTK_WIDGET (wheel));
}
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