356 lines
11 KiB
C
356 lines
11 KiB
C
/* LIBPIKA - The PIKA Library
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* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
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*
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* pikapickbutton.c
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* Copyright (C) 2002 Michael Natterer <mitch@gimp.org>
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*
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* based on gtk+/gtk/gtkcolorsel.c
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <https://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <gegl.h>
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#include <gtk/gtk.h>
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#include <gdk/gdkkeysyms.h>
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#ifdef G_OS_WIN32
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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#endif
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#include "libpikacolor/pikacolor.h"
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#include "pikawidgetstypes.h"
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#include "pikacairo-utils.h"
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#include "pikahelpui.h"
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#include "pikaicons.h"
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#include "pikapickbutton.h"
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#include "pikapickbutton-default.h"
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#include "pikapickbutton-private.h"
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#include "pikawidgetsutils.h"
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#include "libpika/libpika-intl.h"
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static gboolean pika_pick_button_mouse_press (GtkWidget *invisible,
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GdkEventButton *event,
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PikaPickButton *button);
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static gboolean pika_pick_button_key_press (GtkWidget *invisible,
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GdkEventKey *event,
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PikaPickButton *button);
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static gboolean pika_pick_button_mouse_motion (GtkWidget *invisible,
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GdkEventMotion *event,
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PikaPickButton *button);
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static gboolean pika_pick_button_mouse_release (GtkWidget *invisible,
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GdkEventButton *event,
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PikaPickButton *button);
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static void pika_pick_button_shutdown (PikaPickButton *button);
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static void pika_pick_button_pick (PikaPickButton *button,
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GdkEvent *event);
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static GdkCursor *
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make_cursor (GdkDisplay *display)
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{
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GdkPixbuf *pixbuf;
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GError *error = NULL;
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pixbuf = gdk_pixbuf_new_from_resource ("/technology.heckin/color-picker-cursors/cursor-color-picker.png",
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&error);
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if (pixbuf)
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{
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GdkCursor *cursor = gdk_cursor_new_from_pixbuf (display, pixbuf, 1, 30);
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g_object_unref (pixbuf);
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return cursor;
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}
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else
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{
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g_critical ("Failed to create cursor image: %s", error->message);
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g_clear_error (&error);
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}
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return NULL;
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}
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static gboolean
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pika_pick_button_mouse_press (GtkWidget *invisible,
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GdkEventButton *event,
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PikaPickButton *button)
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{
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if (event->type == GDK_BUTTON_PRESS && event->button == 1)
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{
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g_signal_connect (invisible, "motion-notify-event",
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G_CALLBACK (pika_pick_button_mouse_motion),
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button);
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g_signal_connect (invisible, "button-release-event",
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G_CALLBACK (pika_pick_button_mouse_release),
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button);
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g_signal_handlers_disconnect_by_func (invisible,
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pika_pick_button_mouse_press,
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button);
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g_signal_handlers_disconnect_by_func (invisible,
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pika_pick_button_key_press,
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button);
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pika_pick_button_pick (button, (GdkEvent *) event);
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return TRUE;
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}
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return FALSE;
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}
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static gboolean
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pika_pick_button_key_press (GtkWidget *invisible,
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GdkEventKey *event,
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PikaPickButton *button)
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{
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if (event->keyval == GDK_KEY_Escape)
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{
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pika_pick_button_shutdown (button);
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g_signal_handlers_disconnect_by_func (invisible,
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pika_pick_button_mouse_press,
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button);
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g_signal_handlers_disconnect_by_func (invisible,
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pika_pick_button_key_press,
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button);
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return TRUE;
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}
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return FALSE;
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}
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static gboolean
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pika_pick_button_mouse_motion (GtkWidget *invisible,
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GdkEventMotion *event,
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PikaPickButton *button)
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{
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pika_pick_button_pick (button, (GdkEvent *) event);
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return TRUE;
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}
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static gboolean
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pika_pick_button_mouse_release (GtkWidget *invisible,
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GdkEventButton *event,
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PikaPickButton *button)
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{
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if (event->button != 1)
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return FALSE;
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pika_pick_button_pick (button, (GdkEvent *) event);
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pika_pick_button_shutdown (button);
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g_signal_handlers_disconnect_by_func (invisible,
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pika_pick_button_mouse_motion,
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button);
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g_signal_handlers_disconnect_by_func (invisible,
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pika_pick_button_mouse_release,
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button);
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return TRUE;
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}
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static void
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pika_pick_button_shutdown (PikaPickButton *button)
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{
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GdkDisplay *display = gtk_widget_get_display (button->priv->grab_widget);
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gtk_grab_remove (button->priv->grab_widget);
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gdk_seat_ungrab (gdk_display_get_default_seat (display));
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}
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static void
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pika_pick_button_pick (PikaPickButton *button,
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GdkEvent *event)
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{
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GdkScreen *screen = gdk_event_get_screen (event);
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PikaColorProfile *monitor_profile;
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GdkMonitor *monitor;
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PikaRGB rgb;
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gint x_root;
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gint y_root;
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gdouble x_win;
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gdouble y_win;
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gdk_window_get_origin (gdk_event_get_window (event), &x_root, &y_root);
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gdk_event_get_coords (event, &x_win, &y_win);
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x_root += x_win;
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y_root += y_win;
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#ifdef G_OS_WIN32
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{
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HDC hdc;
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RECT rect;
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COLORREF win32_color;
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/* For MS Windows, use native GDI functions to get the pixel, as
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* cairo does not handle the case where you have multiple monitors
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* with a monitor on the left or above the primary monitor. That
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* scenario create a cairo primary surface with negative extent,
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* which is not handled properly (bug 740634).
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*/
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hdc = GetDC (HWND_DESKTOP);
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GetClipBox (hdc, &rect);
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win32_color = GetPixel (hdc, x_root + rect.left, y_root + rect.top);
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ReleaseDC (HWND_DESKTOP, hdc);
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pika_rgba_set_uchar (&rgb,
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GetRValue (win32_color),
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GetGValue (win32_color),
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GetBValue (win32_color),
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255);
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}
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#else
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{
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GdkWindow *window;
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gint x_window;
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gint y_window;
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cairo_surface_t *image;
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cairo_t *cr;
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guchar *data;
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guchar color[3];
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/* we try to pick from the local window under the cursor, and fall
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* back to picking from the root window if this fails (i.e., if
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* the cursor is not under a local window). on wayland, picking
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* from the root window is not supported, so this at least allows
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* us to pick from local windows. see bug #780375.
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*/
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window = gdk_device_get_window_at_position (gdk_event_get_device (event),
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&x_window, &y_window);
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if (! window)
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{
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window = gdk_screen_get_root_window (screen);
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x_window = x_root;
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y_window = y_root;
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}
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image = cairo_image_surface_create (CAIRO_FORMAT_RGB24, 1, 1);
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cr = cairo_create (image);
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gdk_cairo_set_source_window (cr, window, -x_window, -y_window);
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cairo_paint (cr);
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cairo_destroy (cr);
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data = cairo_image_surface_get_data (image);
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PIKA_CAIRO_RGB24_GET_PIXEL (data, color[0], color[1], color[2]);
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cairo_surface_destroy (image);
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pika_rgba_set_uchar (&rgb, color[0], color[1], color[2], 255);
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}
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#endif
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monitor = gdk_display_get_monitor_at_point (gdk_screen_get_display (screen),
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x_root, y_root);
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monitor_profile = pika_monitor_get_color_profile (monitor);
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if (monitor_profile)
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{
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PikaColorProfile *srgb_profile;
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PikaColorTransform *transform;
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const Babl *format;
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PikaColorTransformFlags flags = 0;
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format = babl_format ("R'G'B'A double");
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flags |= PIKA_COLOR_TRANSFORM_FLAGS_NOOPTIMIZE;
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flags |= PIKA_COLOR_TRANSFORM_FLAGS_BLACK_POINT_COMPENSATION;
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srgb_profile = pika_color_profile_new_rgb_srgb ();
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transform = pika_color_transform_new (monitor_profile, format,
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srgb_profile, format,
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PIKA_COLOR_RENDERING_INTENT_PERCEPTUAL,
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flags);
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g_object_unref (srgb_profile);
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if (transform)
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{
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pika_color_transform_process_pixels (transform,
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format, &rgb,
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format, &rgb,
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1);
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pika_rgb_clamp (&rgb);
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g_object_unref (transform);
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}
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}
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g_signal_emit_by_name (button, "color-picked", &rgb);
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}
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/* entry point to this file, called from pikapickbutton.c */
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void
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_pika_pick_button_default_pick (PikaPickButton *button)
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{
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GdkDisplay *display;
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GtkWidget *widget;
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if (! button->priv->cursor)
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button->priv->cursor =
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make_cursor (gtk_widget_get_display (GTK_WIDGET (button)));
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if (! button->priv->grab_widget)
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{
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button->priv->grab_widget = gtk_invisible_new ();
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gtk_widget_add_events (button->priv->grab_widget,
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GDK_BUTTON_PRESS_MASK |
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GDK_BUTTON_RELEASE_MASK |
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GDK_BUTTON1_MOTION_MASK);
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gtk_widget_show (button->priv->grab_widget);
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}
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widget = button->priv->grab_widget;
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display = gtk_widget_get_display (widget);
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if (gdk_seat_grab (gdk_display_get_default_seat (display),
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gtk_widget_get_window (widget),
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GDK_SEAT_CAPABILITY_ALL,
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FALSE,
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button->priv->cursor,
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NULL,
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NULL, NULL) != GDK_GRAB_SUCCESS)
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{
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g_warning ("Failed to grab seat to do eyedropper");
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return;
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}
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gtk_grab_add (widget);
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g_signal_connect (widget, "button-press-event",
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G_CALLBACK (pika_pick_button_mouse_press),
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button);
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g_signal_connect (widget, "key-press-event",
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G_CALLBACK (pika_pick_button_key_press),
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button);
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}
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