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gimp/libgimpwidgets/gimppickbutton-default.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 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-default.h"
#include "gimpwidgetsutils.h"
#include "cursors/gimp-color-picker-cursors.c"
#include "libgimp/libgimp-intl.h"
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 (GdkScreen *screen,
gint x_root,
gint y_root,
GimpPickButton *button);
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);
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)
{
gint x_root;
gint y_root;
gdk_window_get_origin (event->window, &x_root, &y_root);
x_root += event->x;
y_root += event->y;
gimp_pick_button_pick (gdk_event_get_screen ((GdkEvent *) event),
x_root, y_root, button);
return TRUE;
}
static gboolean
gimp_pick_button_mouse_release (GtkWidget *invisible,
GdkEventButton *event,
GimpPickButton *button)
{
gint x_root;
gint y_root;
if (event->button != 1)
return FALSE;
gdk_window_get_origin (event->window, &x_root, &y_root);
x_root += event->x;
y_root += event->y;
gimp_pick_button_pick (gdk_event_get_screen ((GdkEvent *) event),
x_root, y_root, button);
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)
{
GdkDisplay *display = gtk_widget_get_display (button->grab_widget);
guint32 timestamp = gtk_get_current_event_time ();
gdk_display_keyboard_ungrab (display, timestamp);
gdk_display_pointer_ungrab (display, timestamp);
gtk_grab_remove (button->grab_widget);
}
static void
gimp_pick_button_pick (GdkScreen *screen,
gint x_root,
gint y_root,
GimpPickButton *button)
{
GimpRGB rgb;
GimpColorProfile *monitor_profile;
gint monitor;
#ifdef G_OS_WIN32
HDC hdc;
RECT rect;
COLORREF win32_color;
/* 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);
gimp_rgba_set_uchar (&rgb,
GetRValue (win32_color),
GetGValue (win32_color),
GetBValue (win32_color),
255);
#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_display_get_window_at_pointer (gdk_screen_get_display (screen),
&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);
gimp_rgba_set_uchar (&rgb, color[0], color[1], color[2], 255);
#endif
monitor = gdk_screen_get_monitor_at_point (screen, x_root, y_root);
monitor_profile = gimp_screen_get_color_profile (screen, monitor);
if (monitor_profile)
{
GimpColorProfile *srgb_profile;
GimpColorTransform *transform;
const Babl *format;
GimpColorTransformFlags flags = 0;
format = babl_format ("R'G'B'A double");
flags |= GIMP_COLOR_TRANSFORM_FLAGS_NOOPTIMIZE;
flags |= GIMP_COLOR_TRANSFORM_FLAGS_BLACK_POINT_COMPENSATION;
srgb_profile = gimp_color_profile_new_rgb_srgb ();
transform = gimp_color_transform_new (monitor_profile, format,
srgb_profile, format,
GIMP_COLOR_RENDERING_INTENT_PERCEPTUAL,
flags);
g_object_unref (srgb_profile);
if (transform)
{
gimp_color_transform_process_pixels (transform,
format, &rgb,
format, &rgb,
1);
gimp_rgb_clamp (&rgb);
g_object_unref (transform);
}
}
g_signal_emit_by_name (button, "color-picked", &rgb);
}
/* entry point to this file, called from gimppickbutton.c */
void
_gimp_pick_button_default_pick (GimpPickButton *button)
{
GtkWidget *widget;
guint32 timestamp;
if (! button->cursor)
button->cursor = make_cursor (gtk_widget_get_display (GTK_WIDGET (button)));
if (! button->grab_widget)
{
button->grab_widget = gtk_invisible_new ();
gtk_widget_add_events (button->grab_widget,
GDK_BUTTON_RELEASE_MASK |
GDK_BUTTON_PRESS_MASK |
GDK_POINTER_MOTION_MASK);
gtk_widget_show (button->grab_widget);
}
widget = button->grab_widget;
timestamp = gtk_get_current_event_time ();
if (gdk_keyboard_grab (gtk_widget_get_window (widget), FALSE,
timestamp) != GDK_GRAB_SUCCESS)
{
g_warning ("Failed to grab keyboard to do eyedropper");
return;
}
if (gdk_pointer_grab (gtk_widget_get_window (widget), FALSE,
GDK_BUTTON_RELEASE_MASK |
GDK_BUTTON_PRESS_MASK |
GDK_POINTER_MOTION_MASK,
NULL,
button->cursor,
timestamp) != GDK_GRAB_SUCCESS)
{
gdk_display_keyboard_ungrab (gtk_widget_get_display (widget), timestamp);
g_warning ("Failed to grab pointer 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);
}
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