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gimp/libgimpwidgets/gimppickbutton.c

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/* LIBGIMP - The GIMP Library
* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
*
* gimppickbutton.c
* Copyright (C) 2002 Michael Natterer <mitch@gimp.org>
*
* based on gtk+/gtk/gtkcolorsel.c
*
* 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
* Library 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, see
* <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gegl.h>
#include <gtk/gtk.h>
#include <gdk/gdkkeysyms.h>
#ifdef GDK_WINDOWING_X11
#include <gdk/gdkx.h>
#endif
#ifdef G_OS_WIN32
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#endif
#include "libgimpcolor/gimpcolor.h"
#include "gimpwidgetstypes.h"
#include "gimpcairo-utils.h"
#include "gimphelpui.h"
#include "gimpicons.h"
#include "gimppickbutton.h"
#include "gimppickbutton-private.h"
#include "gimpwidgetsutils.h"
#include "libgimp/libgimp-intl.h"
#if defined (GDK_WINDOWING_QUARTZ)
#include "gimppickbutton-quartz.h"
#elif defined (GDK_WINDOWING_WIN32)
#include "gimppickbutton-win32.h"
#else
#include "gimppickbutton-kwin.h"
#include "gimppickbutton-xdg.h"
#endif
/**
* SECTION: gimppickbutton
* @title: GimpPickButton
* @short_description: Widget to pick a color from screen.
*
* #GimpPickButton is a specialized button. When clicked, it changes
* the cursor to a color-picker pipette and allows the user to pick a
* color from any point on the screen.
**/
enum
{
COLOR_PICKED,
LAST_SIGNAL
};
#define GET_PRIVATE(obj) ((GimpPickButtonPrivate *) gimp_pick_button_get_instance_private ((GimpPickButton *) (obj)))
static void gimp_pick_button_dispose (GObject *object);
static void gimp_pick_button_clicked (GtkButton *button);
static gboolean gimp_pick_button_mouse_press (GtkWidget *invisible,
GdkEventButton *event,
GimpPickButton *button);
static gboolean gimp_pick_button_key_press (GtkWidget *invisible,
GdkEventKey *event,
GimpPickButton *button);
static gboolean gimp_pick_button_mouse_motion (GtkWidget *invisible,
GdkEventMotion *event,
GimpPickButton *button);
static gboolean gimp_pick_button_mouse_release (GtkWidget *invisible,
GdkEventButton *event,
GimpPickButton *button);
static void gimp_pick_button_shutdown (GimpPickButton *button);
static void gimp_pick_button_pick (GimpPickButton *button,
GdkEvent *event);
G_DEFINE_TYPE_WITH_PRIVATE (GimpPickButton, gimp_pick_button, GTK_TYPE_BUTTON)
#define parent_class gimp_pick_button_parent_class
static guint pick_button_signals[LAST_SIGNAL] = { 0 };
static void
gimp_pick_button_class_init (GimpPickButtonClass* klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GtkButtonClass *button_class = GTK_BUTTON_CLASS (klass);
/**
* GimpPickButton::color-picked:
* @gimppickbutton: the object which received the signal.
* @color: pointer to a #GeglColor structure that holds the picked color
*
* This signal is emitted when the user has picked a color.
**/
pick_button_signals[COLOR_PICKED] =
g_signal_new ("color-picked",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GimpPickButtonClass, color_picked),
NULL, NULL, NULL,
G_TYPE_NONE, 1,
GEGL_TYPE_COLOR);
object_class->dispose = gimp_pick_button_dispose;
button_class->clicked = gimp_pick_button_clicked;
klass->color_picked = NULL;
}
static void
gimp_pick_button_init (GimpPickButton *button)
{
GtkWidget *image;
image = gtk_image_new_from_icon_name (GIMP_ICON_COLOR_PICK_FROM_SCREEN,
GTK_ICON_SIZE_BUTTON);
gtk_container_add (GTK_CONTAINER (button), image);
gtk_widget_show (image);
gimp_help_set_help_data (GTK_WIDGET (button),
_("Click the eyedropper, then click a color "
"anywhere on your screen to select that color."),
NULL);
}
static void
gimp_pick_button_dispose (GObject *object)
{
GimpPickButton *button = GIMP_PICK_BUTTON (object);
GimpPickButtonPrivate *priv = GET_PRIVATE (button);
if (priv->cursor)
{
g_object_unref (priv->cursor);
priv->cursor = NULL;
}
if (priv->grab_widget)
{
gtk_widget_destroy (priv->grab_widget);
priv->grab_widget = NULL;
}
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
gimp_pick_button_clicked (GtkButton *button)
{
#if defined (GDK_WINDOWING_QUARTZ)
_gimp_pick_button_quartz_pick (GIMP_PICK_BUTTON (button));
#elif defined (GDK_WINDOWING_WIN32)
_gimp_pick_button_win32_pick (GIMP_PICK_BUTTON (button));
#else
#ifdef GDK_WINDOWING_X11
/* It's a bit weird as we use the default pick code both in first and
* last cases. It's because when running GIMP on X11 in particular,
* the portals don't return color space information. So the returned
* color is in the display space, not in the current image space and
* we have no way to convert the data back (well if running on X11, we
* could still get a profile from the display, but if there are
* several displays, we can't know for sure where the color was picked
* from.).
* See: https://github.com/flatpak/xdg-desktop-portal/issues/862
*/
if (GDK_IS_X11_DISPLAY (gdk_display_get_default ()))
_gimp_pick_button_default_pick (GIMP_PICK_BUTTON (button));
else
#endif
if (_gimp_pick_button_xdg_available ())
_gimp_pick_button_xdg_pick (GIMP_PICK_BUTTON (button));
else if (_gimp_pick_button_kwin_available ())
_gimp_pick_button_kwin_pick (GIMP_PICK_BUTTON (button));
else
_gimp_pick_button_default_pick (GIMP_PICK_BUTTON (button));
#endif
}
/* default implementation functions */
static GdkCursor *
make_cursor (GdkDisplay *display)
{
GdkPixbuf *pixbuf;
GError *error = NULL;
pixbuf = gdk_pixbuf_new_from_resource ("/org/gimp/color-picker-cursors/cursor-color-picker.png",
&error);
if (pixbuf)
{
GdkCursor *cursor = gdk_cursor_new_from_pixbuf (display, pixbuf, 1, 30);
g_object_unref (pixbuf);
return cursor;
}
else
{
g_critical ("Failed to create cursor image: %s", error->message);
g_clear_error (&error);
}
return NULL;
}
static gboolean
gimp_pick_button_mouse_press (GtkWidget *invisible,
GdkEventButton *event,
GimpPickButton *button)
{
if (event->type == GDK_BUTTON_PRESS && event->button == 1)
{
g_signal_connect (invisible, "motion-notify-event",
G_CALLBACK (gimp_pick_button_mouse_motion),
button);
g_signal_connect (invisible, "button-release-event",
G_CALLBACK (gimp_pick_button_mouse_release),
button);
g_signal_handlers_disconnect_by_func (invisible,
gimp_pick_button_mouse_press,
button);
g_signal_handlers_disconnect_by_func (invisible,
gimp_pick_button_key_press,
button);
gimp_pick_button_pick (button, (GdkEvent *) event);
return TRUE;
}
return FALSE;
}
static gboolean
gimp_pick_button_key_press (GtkWidget *invisible,
GdkEventKey *event,
GimpPickButton *button)
{
if (event->keyval == GDK_KEY_Escape)
{
gimp_pick_button_shutdown (button);
g_signal_handlers_disconnect_by_func (invisible,
gimp_pick_button_mouse_press,
button);
g_signal_handlers_disconnect_by_func (invisible,
gimp_pick_button_key_press,
button);
return TRUE;
}
return FALSE;
}
static gboolean
gimp_pick_button_mouse_motion (GtkWidget *invisible,
GdkEventMotion *event,
GimpPickButton *button)
{
gimp_pick_button_pick (button, (GdkEvent *) event);
return TRUE;
}
static gboolean
gimp_pick_button_mouse_release (GtkWidget *invisible,
GdkEventButton *event,
GimpPickButton *button)
{
if (event->button != 1)
return FALSE;
gimp_pick_button_pick (button, (GdkEvent *) event);
gimp_pick_button_shutdown (button);
g_signal_handlers_disconnect_by_func (invisible,
gimp_pick_button_mouse_motion,
button);
g_signal_handlers_disconnect_by_func (invisible,
gimp_pick_button_mouse_release,
button);
return TRUE;
}
static void
gimp_pick_button_shutdown (GimpPickButton *button)
{
GimpPickButtonPrivate *priv = GET_PRIVATE (button);
GdkDisplay *display = gtk_widget_get_display (priv->grab_widget);
gtk_grab_remove (priv->grab_widget);
gdk_seat_ungrab (gdk_display_get_default_seat (display));
}
static void
gimp_pick_button_pick (GimpPickButton *button,
GdkEvent *event)
{
GdkScreen *screen = gdk_event_get_screen (event);
GimpColorProfile *monitor_profile;
GdkMonitor *monitor;
GeglColor *rgb = gegl_color_new ("black");
const Babl *space = NULL;
gint x_root;
gint y_root;
gdouble x_win;
gdouble y_win;
gdk_window_get_origin (gdk_event_get_window (event), &x_root, &y_root);
gdk_event_get_coords (event, &x_win, &y_win);
x_root += x_win;
y_root += y_win;
monitor = gdk_display_get_monitor_at_point (gdk_screen_get_display (screen),
x_root, y_root);
monitor_profile = gimp_monitor_get_color_profile (monitor);
if (monitor_profile)
space = gimp_color_profile_get_space (monitor_profile,
GIMP_COLOR_RENDERING_INTENT_PERCEPTUAL,
NULL);
#ifdef G_OS_WIN32
{
HDC hdc;
RECT rect;
COLORREF win32_color;
guchar temp_rgb[3];
/* For MS Windows, use native GDI functions to get the pixel, as
* cairo does not handle the case where you have multiple monitors
* with a monitor on the left or above the primary monitor. That
* scenario create a cairo primary surface with negative extent,
* which is not handled properly (bug 740634).
*/
hdc = GetDC (HWND_DESKTOP);
GetClipBox (hdc, &rect);
win32_color = GetPixel (hdc, x_root + rect.left, y_root + rect.top);
ReleaseDC (HWND_DESKTOP, hdc);
temp_rgb[0] = GetRValue (win32_color);
temp_rgb[1] = GetGValue (win32_color);
temp_rgb[2] = GetBValue (win32_color);
gegl_color_set_pixel (rgb, babl_format_with_space ("R'G'B' u8", space),
temp_rgb);
}
#else
{
GdkWindow *window;
gint x_window;
gint y_window;
cairo_surface_t *image;
cairo_t *cr;
guchar *data;
guchar color[3];
/* we try to pick from the local window under the cursor, and fall
* back to picking from the root window if this fails (i.e., if
* the cursor is not under a local window). on wayland, picking
* from the root window is not supported, so this at least allows
* us to pick from local windows. see bug #780375.
*/
window = gdk_device_get_window_at_position (gdk_event_get_device (event),
&x_window, &y_window);
if (! window)
{
window = gdk_screen_get_root_window (screen);
x_window = x_root;
y_window = y_root;
}
image = cairo_image_surface_create (CAIRO_FORMAT_RGB24, 1, 1);
cr = cairo_create (image);
gdk_cairo_set_source_window (cr, window, -x_window, -y_window);
cairo_paint (cr);
cairo_destroy (cr);
data = cairo_image_surface_get_data (image);
GIMP_CAIRO_RGB24_GET_PIXEL (data, color[0], color[1], color[2]);
cairo_surface_destroy (image);
gegl_color_set_pixel (rgb, babl_format_with_space ("R'G'B' u8", space),
color);
}
#endif
g_signal_emit_by_name (button, "color-picked", rgb);
g_object_unref (rgb);
}
/* entry point to this file, called from gimppickbutton.c */
void
_gimp_pick_button_default_pick (GimpPickButton *button)
{
GimpPickButtonPrivate *priv = GET_PRIVATE (button);
GdkDisplay *display;
GtkWidget *widget;
if (! priv->cursor)
priv->cursor =
make_cursor (gtk_widget_get_display (GTK_WIDGET (button)));
if (! priv->grab_widget)
{
priv->grab_widget = gtk_invisible_new ();
gtk_widget_add_events (priv->grab_widget,
GDK_BUTTON_PRESS_MASK |
GDK_BUTTON_RELEASE_MASK |
GDK_BUTTON1_MOTION_MASK);
gtk_widget_show (priv->grab_widget);
}
widget = priv->grab_widget;
display = gtk_widget_get_display (widget);
if (gdk_seat_grab (gdk_display_get_default_seat (display),
gtk_widget_get_window (widget),
GDK_SEAT_CAPABILITY_ALL,
FALSE,
priv->cursor,
NULL,
NULL, NULL) != GDK_GRAB_SUCCESS)
{
g_warning ("Failed to grab seat to do eyedropper");
return;
}
gtk_grab_add (widget);
g_signal_connect (widget, "button-press-event",
G_CALLBACK (gimp_pick_button_mouse_press),
button);
g_signal_connect (widget, "key-press-event",
G_CALLBACK (gimp_pick_button_key_press),
button);
}
/* public functions */
/**
* gimp_pick_button_new:
*
* Creates a new #GimpPickButton widget.
*
* Returns: A new #GimpPickButton widget.
**/
GtkWidget *
gimp_pick_button_new (void)
{
return g_object_new (GIMP_TYPE_PICK_BUTTON, NULL);
}
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