gtk2/gtk/gtkcolorplane.c

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2012-01-30 23:37:00 +00:00
/* GTK - The GIMP Toolkit
* Copyright (C) 2012 Red Hat, Inc.
*
* 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.
*/
#include "config.h"
#include "gtkhsv.h"
#include "gtkcolorplane.h"
struct _GtkColorPlanePrivate
{
cairo_surface_t *surface;
gdouble h, s, v;
gint x, y;
gboolean in_drag;
};
enum
{
CHANGED,
LAST_SIGNAL
};
guint signals[LAST_SIGNAL];
G_DEFINE_TYPE (GtkColorPlane, gtk_color_plane, GTK_TYPE_DRAWING_AREA)
static gboolean
sv_draw (GtkWidget *widget,
cairo_t *cr)
{
GtkColorPlane *plane = GTK_COLOR_PLANE (widget);
gint x, y;
gint width, height;
cairo_set_source_surface (cr, plane->priv->surface, 0, 0);
cairo_paint (cr);
x = plane->priv->x;
y = plane->priv->y;
width = gtk_widget_get_allocated_width (widget);
height = gtk_widget_get_allocated_height (widget);
cairo_move_to (cr, 0, y + 0.5);
cairo_line_to (cr, width, y + 0.5);
cairo_move_to (cr, x + 0.5, 0);
cairo_line_to (cr, x + 0.5, height);
if (gtk_widget_has_visible_focus (widget))
{
cairo_set_line_width (cr, 3.0);
cairo_set_source_rgba (cr, 1.0, 1.0, 1.0, 0.6);
cairo_stroke_preserve (cr);
cairo_set_line_width (cr, 1.0);
cairo_set_source_rgba (cr, 0.0, 0.0, 0.0, 0.8);
cairo_stroke (cr);
}
else
{
cairo_set_line_width (cr, 1.0);
cairo_set_source_rgba (cr, 0.8, 0.8, 0.8, 0.8);
cairo_stroke (cr);
}
return FALSE;
}
static void
create_sv_surface (GtkColorPlane *plane)
{
GtkWidget *widget = GTK_WIDGET (plane);
cairo_t *cr;
cairo_surface_t *surface;
gint width, height, stride;
cairo_surface_t *tmp;
guint red, green, blue;
guint32 *data, *p;
gdouble h, s, v;
gdouble r, g, b;
gdouble sf, vf;
gint x, y;
if (!gtk_widget_get_realized (widget))
return;
width = gtk_widget_get_allocated_width (widget);
height = gtk_widget_get_allocated_height (widget);
surface = gdk_window_create_similar_surface (gtk_widget_get_window (widget),
CAIRO_CONTENT_COLOR,
width, height);
if (plane->priv->surface)
cairo_surface_destroy (plane->priv->surface);
plane->priv->surface = surface;
if (width == 1 || height == 1)
return;
stride = cairo_format_stride_for_width (CAIRO_FORMAT_RGB24, width);
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data = g_malloc (height * stride);
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h = plane->priv->h;
sf = 1.0 / (height - 1);
vf = 1.0 / (width - 1);
for (y = 0; y < height; y++)
{
s = CLAMP (1.0 - y * sf, 0.0, 1.0);
p = data + y * (stride / 4);
for (x = 0; x < width; x++)
{
v = x * vf;
gtk_hsv_to_rgb (h, s, v, &r, &g, &b);
red = CLAMP (r * 255, 0, 255);
green = CLAMP (g * 255, 0, 255);
blue = CLAMP (b * 255, 0, 255);
p[x] = (red << 16) | (green << 8) | blue;
}
}
tmp = cairo_image_surface_create_for_data ((guchar *)data, CAIRO_FORMAT_RGB24,
width, height, stride);
cr = cairo_create (surface);
cairo_set_source_surface (cr, tmp, 0, 0);
cairo_paint (cr);
cairo_destroy (cr);
cairo_surface_destroy (tmp);
g_free (data);
}
static void
hsv_to_xy (GtkColorPlane *plane)
{
gint width, height;
width = gtk_widget_get_allocated_width (GTK_WIDGET (plane));
height = gtk_widget_get_allocated_height (GTK_WIDGET (plane));
plane->priv->x = CLAMP (width * plane->priv->v, 0, width - 1);
plane->priv->y = CLAMP (height * (1 - plane->priv->s), 0, height - 1);
}
static gboolean
sv_configure (GtkWidget *widget,
GdkEventConfigure *event)
{
GtkColorPlane *plane = GTK_COLOR_PLANE (widget);
create_sv_surface (plane);
hsv_to_xy (plane);
return TRUE;
}
static void
set_cross_grab (GtkWidget *widget,
GdkDevice *device,
guint32 time)
{
GdkCursor *cursor;
cursor = gdk_cursor_new_for_display (gtk_widget_get_display (GTK_WIDGET (widget)),
GDK_CROSSHAIR);
gdk_device_grab (device,
gtk_widget_get_window (widget),
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
sv_grab_broken (GtkWidget *widget,
GdkEventGrabBroken *event)
{
GtkColorPlane *plane = GTK_COLOR_PLANE (widget);
plane->priv->in_drag = FALSE;
return TRUE;
}
static void
sv_update_color (GtkColorPlane *plane,
gint x,
gint y)
{
GtkWidget *widget = GTK_WIDGET (plane);
plane->priv->x = x;
plane->priv->y = y;
plane->priv->s = CLAMP (1 - y * (1.0 / gtk_widget_get_allocated_height (widget)), 0, 1);
plane->priv->v = CLAMP (x * (1.0 / gtk_widget_get_allocated_width (widget)), 0, 1);
g_signal_emit (plane, signals[CHANGED], 0);
gtk_widget_queue_draw (widget);
}
static gboolean
sv_button_press (GtkWidget *widget,
GdkEventButton *event)
{
GtkColorPlane *plane = GTK_COLOR_PLANE (widget);
if (plane->priv->in_drag || event->button != GDK_BUTTON_PRIMARY)
return FALSE;
plane->priv->in_drag = TRUE;
set_cross_grab (widget, gdk_event_get_device ((GdkEvent*)event), event->time);
sv_update_color (plane, event->x, event->y);
gtk_widget_grab_focus (widget);
return TRUE;
}
static gboolean
sv_button_release (GtkWidget *widget,
GdkEventButton *event)
{
GtkColorPlane *plane = GTK_COLOR_PLANE (widget);
if (!plane->priv->in_drag || event->button != GDK_BUTTON_PRIMARY)
return FALSE;
plane->priv->in_drag = FALSE;
sv_update_color (plane, event->x, event->y);
gdk_device_ungrab (gdk_event_get_device ((GdkEvent *) event), event->time);
return TRUE;
}
static gboolean
sv_motion (GtkWidget *widget,
GdkEventMotion *event)
{
GtkColorPlane *plane = GTK_COLOR_PLANE (widget);
if (!plane->priv->in_drag)
return FALSE;
gdk_event_request_motions (event);
sv_update_color (plane, event->x, event->y);
return TRUE;
}
static void
sv_move (GtkColorPlane *plane,
gdouble ds,
gdouble dv)
{
if (plane->priv->s + ds > 1)
{
if (plane->priv->s < 1)
plane->priv->s = 1;
else
goto error;
}
else if (plane->priv->s + ds < 0)
{
if (plane->priv->s > 0)
plane->priv->s = 0;
else
goto error;
}
else
{
plane->priv->s += ds;
}
if (plane->priv->v + dv > 1)
{
if (plane->priv->v < 1)
plane->priv->v = 1;
else
goto error;
}
else if (plane->priv->v + dv < 0)
{
if (plane->priv->v > 0)
plane->priv->v = 0;
else
goto error;
}
else
{
plane->priv->v += dv;
}
hsv_to_xy (plane);
g_signal_emit (plane, signals[CHANGED], 0);
gtk_widget_queue_draw (GTK_WIDGET (plane));
return;
error:
gtk_widget_error_bell (GTK_WIDGET (plane));
}
static gboolean
sv_key_press (GtkWidget *widget,
GdkEventKey *event)
{
GtkColorPlane *plane = GTK_COLOR_PLANE (widget);
gdouble step;
/* FIXME: turn into bindings */
if ((event->state & GDK_MOD1_MASK) != 0)
step = 0.1;
else
step = 0.01;
if (event->keyval == GDK_KEY_Up ||
event->keyval == GDK_KEY_KP_Up)
sv_move (plane, step, 0);
else if (event->keyval == GDK_KEY_Down ||
event->keyval == GDK_KEY_KP_Down)
sv_move (plane, -step, 0);
else if (event->keyval == GDK_KEY_Left ||
event->keyval == GDK_KEY_KP_Left)
sv_move (plane, 0, -step);
else if (event->keyval == GDK_KEY_Right ||
event->keyval == GDK_KEY_KP_Right)
sv_move (plane, 0, step);
else
return FALSE;
return TRUE;
}
static void
gtk_color_plane_init (GtkColorPlane *plane)
{
plane->priv = G_TYPE_INSTANCE_GET_PRIVATE (plane,
GTK_TYPE_COLOR_PLANE,
GtkColorPlanePrivate);
gtk_widget_set_can_focus (GTK_WIDGET (plane), TRUE);
gtk_widget_set_events (GTK_WIDGET (plane), GDK_KEY_PRESS_MASK
| GDK_BUTTON_PRESS_MASK
| GDK_BUTTON_RELEASE_MASK
| GDK_POINTER_MOTION_MASK);
}
static void
sv_finalize (GObject *object)
{
GtkColorPlane *plane = GTK_COLOR_PLANE (object);
cairo_surface_destroy (plane->priv->surface);
G_OBJECT_CLASS (gtk_color_plane_parent_class)->finalize (object);
}
static void
gtk_color_plane_class_init (GtkColorPlaneClass *class)
{
GObjectClass *object_class = G_OBJECT_CLASS (class);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
object_class->finalize = sv_finalize;
widget_class->draw = sv_draw;
widget_class->configure_event = sv_configure;
widget_class->button_press_event = sv_button_press;
widget_class->button_release_event = sv_button_release;
widget_class->motion_notify_event = sv_motion;
widget_class->grab_broken_event = sv_grab_broken;
widget_class->key_press_event = sv_key_press;
signals[CHANGED] =
g_signal_new ("changed",
GTK_TYPE_COLOR_PLANE,
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GtkColorPlaneClass, changed),
NULL, NULL,
NULL,
G_TYPE_NONE, 0);
g_type_class_add_private (class, sizeof (GtkColorPlanePrivate));
}
gdouble
gtk_color_plane_get_h (GtkColorPlane *plane)
{
return plane->priv->h;
}
gdouble
gtk_color_plane_get_s (GtkColorPlane *plane)
{
return plane->priv->s;
}
gdouble
gtk_color_plane_get_v (GtkColorPlane *plane)
{
return plane->priv->v;
}
void
gtk_color_plane_set_h (GtkColorPlane *plane,
gdouble h)
{
plane->priv->h = h;
create_sv_surface (plane);
gtk_widget_queue_draw (GTK_WIDGET (plane));
}
void
gtk_color_plane_set_s (GtkColorPlane *plane,
gdouble s)
{
plane->priv->s = s;
hsv_to_xy (plane);
gtk_widget_queue_draw (GTK_WIDGET (plane));
}
void
gtk_color_plane_set_v (GtkColorPlane *plane,
gdouble v)
{
plane->priv->v = v;
hsv_to_xy (plane);
gtk_widget_queue_draw (GTK_WIDGET (plane));
}
GtkWidget *
gtk_color_plane_new (void)
{
return (GtkWidget *) g_object_new (GTK_TYPE_COLOR_PLANE, NULL);
}