gimppickbutton-default.c 11.4 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
/* 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
 * <http://www.gnu.org/licenses/>.
 */

#include "config.h"

#include <gegl.h>
#include <gtk/gtk.h>
#include <gdk/gdkkeysyms.h>

25 26 27 28 29
#ifdef G_OS_WIN32
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#endif

30 31 32 33 34 35
#include "libgimpcolor/gimpcolor.h"

#include "gimpwidgetstypes.h"

#include "gimpcairo-utils.h"
#include "gimphelpui.h"
36
#include "gimpicons.h"
37
#include "gimppickbutton.h"
38
#include "gimppickbutton-default.h"
39
#include "gimpwidgetsutils.h"
40 41 42 43 44

#include "cursors/gimp-color-picker-cursors.c"

#include "libgimp/libgimp-intl.h"

45

46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63
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);

64

65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205
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)
{
206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235
  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

236 237 238
  GdkWindow        *window;
  gint              x_window;
  gint              y_window;
239 240 241 242
  cairo_surface_t  *image;
  cairo_t          *cr;
  guchar           *data;
  guchar            color[3];
243

244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259
  /* 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;
    }

260 261 262 263
  image = cairo_image_surface_create (CAIRO_FORMAT_RGB24, 1, 1);

  cr = cairo_create (image);

264
  gdk_cairo_set_source_window (cr, window, -x_window, -y_window);
265 266 267 268 269 270 271 272 273 274 275
  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);

276 277
#endif

278 279 280 281 282
  monitor = gdk_screen_get_monitor_at_point (screen, x_root, y_root);
  monitor_profile = gimp_screen_get_color_profile (screen, monitor);

  if (monitor_profile)
    {
283 284 285 286
      GimpColorProfile        *srgb_profile;
      GimpColorTransform      *transform;
      const Babl              *format;
      GimpColorTransformFlags  flags = 0;
287 288 289

      format = babl_format ("R'G'B'A double");

290 291 292
      flags |= GIMP_COLOR_TRANSFORM_FLAGS_NOOPTIMIZE;
      flags |= GIMP_COLOR_TRANSFORM_FLAGS_BLACK_POINT_COMPENSATION;

293 294 295
      srgb_profile = gimp_color_profile_new_rgb_srgb ();
      transform = gimp_color_transform_new (monitor_profile, format,
                                            srgb_profile,    format,
296 297
                                            GIMP_COLOR_RENDERING_INTENT_PERCEPTUAL,
                                            flags);
298 299
      g_object_unref (srgb_profile);

300 301 302 303 304 305 306
      if (transform)
        {
          gimp_color_transform_process_pixels (transform,
                                               format, &rgb,
                                               format, &rgb,
                                               1);
          gimp_rgb_clamp (&rgb);
307

308 309
          g_object_unref (transform);
        }
310 311
    }

312
  g_signal_emit_by_name (button, "color-picked", &rgb);
313 314 315 316
}

/* entry point to this file, called from gimppickbutton.c */
void
317
_gimp_pick_button_default_pick (GimpPickButton *button)
318
{
319 320
  GtkWidget *widget;
  guint32    timestamp;
321 322

  if (! button->cursor)
323
    button->cursor = make_cursor (gtk_widget_get_display (GTK_WIDGET (button)));
324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368

  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);
}