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PIKApp/plug-ins/screenshot/screenshot-x11.c

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/* PIKA - Photo and Image Kooker Application
* a rebranding of The GNU Image Manipulation Program (created with heckimp)
* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
*
* Original copyright, applying to most contents (license remains unchanged):
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* Screenshot plug-in
* Copyright 1998-2007 Sven Neumann <sven@gimp.org>
* Copyright 2003 Henrik Brix Andersen <brix@gimp.org>
* Copyright 2012 Simone Karin Lehmann - OS X patches
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <libpika/pika.h>
#include <libpika/pikaui.h>
#ifdef GDK_WINDOWING_X11
#include <gdk/gdkkeysyms.h>
#include <gdk/gdkx.h>
#ifdef HAVE_X11_EXTENSIONS_SHAPE_H
#include <X11/extensions/shape.h>
#endif
#ifdef HAVE_X11_XMU_WINUTIL_H
#include <X11/Xmu/WinUtil.h>
#endif
#ifdef HAVE_XFIXES
#include <X11/extensions/Xfixes.h>
#endif
#include "screenshot.h"
#include "screenshot-x11.h"
#include "libpika/stdplugins-intl.h"
static guint32 select_window (ScreenshotValues *shootvals,
GdkMonitor *monitor);
static PikaImage * create_image (cairo_surface_t *surface,
cairo_region_t *shape,
const gchar *name);
/* Allow the user to select a window or a region with the mouse */
static guint32
select_window (ScreenshotValues *shootvals,
GdkMonitor *monitor)
{
Display *x_dpy = GDK_DISPLAY_XDISPLAY (gdk_monitor_get_display (monitor));
gint x_scr = 0;
Window x_root = RootWindow (x_dpy, x_scr);
Window x_win = None;
GC x_gc = NULL;
Cursor x_cursor = XCreateFontCursor (x_dpy, GDK_CROSSHAIR);
GdkKeymap *keymap;
GdkKeymapKey *keys = NULL;
gint status;
gint num_keys;
gint i;
gint buttons = 0;
gint mask = ButtonPressMask | ButtonReleaseMask;
gboolean cancel = FALSE;
if (shootvals->shoot_type == SHOOT_REGION)
mask |= PointerMotionMask;
status = XGrabPointer (x_dpy, x_root, False,
mask, GrabModeSync, GrabModeAsync,
x_root, x_cursor, CurrentTime);
if (status != GrabSuccess)
{
gint x, y;
guint xmask;
/* if we can't grab the pointer, return the window under the pointer */
XQueryPointer (x_dpy, x_root, &x_root, &x_win, &x, &y, &x, &y, &xmask);
if (x_win == None || x_win == x_root)
g_message (_("Error selecting the window"));
}
if (shootvals->shoot_type == SHOOT_REGION)
{
XGCValues gc_values;
gc_values.function = GXxor;
gc_values.plane_mask = AllPlanes;
gc_values.foreground = WhitePixel (x_dpy, x_scr);
gc_values.background = BlackPixel (x_dpy, x_scr);
gc_values.line_width = 0;
gc_values.line_style = LineSolid;
gc_values.fill_style = FillSolid;
gc_values.cap_style = CapButt;
gc_values.join_style = JoinMiter;
gc_values.graphics_exposures = FALSE;
gc_values.clip_x_origin = 0;
gc_values.clip_y_origin = 0;
gc_values.clip_mask = None;
gc_values.subwindow_mode = IncludeInferiors;
x_gc = XCreateGC (x_dpy, x_root,
GCFunction | GCPlaneMask | GCForeground | GCLineWidth |
GCLineStyle | GCCapStyle | GCJoinStyle |
GCGraphicsExposures | GCBackground | GCFillStyle |
GCClipXOrigin | GCClipYOrigin | GCClipMask |
GCSubwindowMode,
&gc_values);
}
keymap = gdk_keymap_get_for_display (gdk_monitor_get_display (monitor));
if (gdk_keymap_get_entries_for_keyval (keymap, GDK_KEY_Escape,
&keys, &num_keys))
{
GdkDisplay *display = gdk_monitor_get_display (monitor);
gdk_x11_display_error_trap_push (display);
#define X_GRAB_KEY(index, modifiers) \
XGrabKey (x_dpy, keys[index].keycode, modifiers, x_root, False, \
GrabModeAsync, GrabModeAsync)
for (i = 0; i < num_keys; i++)
{
X_GRAB_KEY (i, 0);
X_GRAB_KEY (i, LockMask); /* CapsLock */
X_GRAB_KEY (i, Mod2Mask); /* NumLock */
X_GRAB_KEY (i, Mod5Mask); /* ScrollLock */
X_GRAB_KEY (i, LockMask | Mod2Mask); /* CapsLock + NumLock */
X_GRAB_KEY (i, LockMask | Mod5Mask); /* CapsLock + ScrollLock */
X_GRAB_KEY (i, Mod2Mask | Mod5Mask); /* NumLock + ScrollLock */
X_GRAB_KEY (i, LockMask | Mod2Mask | Mod5Mask); /* all */
}
#undef X_GRAB_KEY
gdk_display_flush (display);
if (gdk_x11_display_error_trap_pop (display))
{
/* ignore errors */
}
}
while (! cancel && ((x_win == None) || (buttons != 0)))
{
XEvent x_event;
gint x, y, w, h;
XAllowEvents (x_dpy, SyncPointer, CurrentTime);
XWindowEvent (x_dpy, x_root, mask | KeyPressMask, &x_event);
switch (x_event.type)
{
case ButtonPress:
if (x_win == None)
{
x_win = x_event.xbutton.subwindow;
if (x_win == None)
x_win = x_root;
#ifdef HAVE_X11_XMU_WINUTIL_H
else if (! shootvals->decorate)
x_win = XmuClientWindow (x_dpy, x_win);
#endif
shootvals->x2 = shootvals->x1 = x_event.xbutton.x_root;
shootvals->y2 = shootvals->y1 = x_event.xbutton.y_root;
}
buttons++;
break;
case ButtonRelease:
if (buttons > 0)
buttons--;
if (! buttons && shootvals->shoot_type == SHOOT_REGION)
{
x = MIN (shootvals->x1, shootvals->x2);
y = MIN (shootvals->y1, shootvals->y2);
w = ABS (shootvals->x2 - shootvals->x1);
h = ABS (shootvals->y2 - shootvals->y1);
if (w > 0 && h > 0)
XDrawRectangle (x_dpy, x_root, x_gc, x, y, w, h);
shootvals->x2 = x_event.xbutton.x_root;
shootvals->y2 = x_event.xbutton.y_root;
}
break;
case MotionNotify:
if (buttons > 0)
{
x = MIN (shootvals->x1, shootvals->x2);
y = MIN (shootvals->y1, shootvals->y2);
w = ABS (shootvals->x2 - shootvals->x1);
h = ABS (shootvals->y2 - shootvals->y1);
if (w > 0 && h > 0)
XDrawRectangle (x_dpy, x_root, x_gc, x, y, w, h);
shootvals->x2 = x_event.xmotion.x_root;
shootvals->y2 = x_event.xmotion.y_root;
x = MIN (shootvals->x1, shootvals->x2);
y = MIN (shootvals->y1, shootvals->y2);
w = ABS (shootvals->x2 - shootvals->x1);
h = ABS (shootvals->y2 - shootvals->y1);
if (w > 0 && h > 0)
XDrawRectangle (x_dpy, x_root, x_gc, x, y, w, h);
}
break;
case KeyPress:
{
guint *keyvals;
gint n;
if (gdk_keymap_get_entries_for_keycode (NULL, x_event.xkey.keycode,
NULL, &keyvals, &n))
{
gint i;
for (i = 0; i < n && ! cancel; i++)
if (keyvals[i] == GDK_KEY_Escape)
cancel = TRUE;
g_free (keyvals);
}
}
break;
default:
break;
}
}
if (keys)
{
#define X_UNGRAB_KEY(index, modifiers) \
XUngrabKey (x_dpy, keys[index].keycode, modifiers, x_root)
for (i = 0; i < num_keys; i++)
{
X_UNGRAB_KEY (i, 0);
X_UNGRAB_KEY (i, LockMask); /* CapsLock */
X_UNGRAB_KEY (i, Mod2Mask); /* NumLock */
X_UNGRAB_KEY (i, Mod5Mask); /* ScrollLock */
X_UNGRAB_KEY (i, LockMask | Mod2Mask); /* CapsLock + NumLock */
X_UNGRAB_KEY (i, LockMask | Mod5Mask); /* CapsLock + ScrollLock */
X_UNGRAB_KEY (i, Mod2Mask | Mod5Mask); /* NumLock + ScrollLock */
X_UNGRAB_KEY (i, LockMask | Mod2Mask | Mod5Mask); /* all */
}
#undef X_UNGRAB_KEY
g_free (keys);
}
if (status == GrabSuccess)
XUngrabPointer (x_dpy, CurrentTime);
XFreeCursor (x_dpy, x_cursor);
if (x_gc != NULL)
XFreeGC (x_dpy, x_gc);
return x_win;
}
static gchar *
window_get_utf8_property (GdkDisplay *display,
guint32 window,
const gchar *name)
{
gchar *retval = NULL;
Atom utf8_string;
Atom type = None;
guchar *val = NULL;
gulong nitems = 0;
gulong after = 0;
gint format = 0;
utf8_string = gdk_x11_get_xatom_by_name_for_display (display, "UTF8_STRING");
XGetWindowProperty (GDK_DISPLAY_XDISPLAY (display), window,
gdk_x11_get_xatom_by_name_for_display (display, name),
0, G_MAXLONG, False, utf8_string,
&type, &format, &nitems, &after, &val);
if (type != utf8_string || format != 8 || nitems == 0)
{
if (val)
XFree (val);
return NULL;
}
if (g_utf8_validate ((const gchar *) val, nitems, NULL))
retval = g_strndup ((const gchar *) val, nitems);
XFree (val);
return retval;
}
static gchar *
window_get_title (GdkDisplay *display,
guint window)
{
#ifdef HAVE_X11_XMU_WINUTIL_H
window = XmuClientWindow (GDK_DISPLAY_XDISPLAY (display), window);
#endif
return window_get_utf8_property (display, window, "_NET_WM_NAME");
}
static cairo_region_t *
window_get_shape (GdkMonitor *monitor,
guint32 window)
{
cairo_region_t *shape = NULL;
#if defined(HAVE_X11_EXTENSIONS_SHAPE_H)
XRectangle *rects;
gint rect_count;
gint rect_order;
rects = XShapeGetRectangles (GDK_DISPLAY_XDISPLAY (gdk_monitor_get_display (monitor)),
window,
ShapeBounding,
&rect_count, &rect_order);
if (rects)
{
if (rect_count > 1)
{
gint i;
shape = cairo_region_create ();
for (i = 0; i < rect_count; i++)
{
cairo_rectangle_int_t rect = { rects[i].x,
rects[i].y,
rects[i].width,
rects[i].height };
cairo_region_union_rectangle (shape, &rect);
}
}
XFree (rects);
}
#endif
return shape;
}
static void
image_select_shape (PikaImage *image,
cairo_region_t *shape)
{
gint num_rects;
gint i;
pika_selection_none (image);
num_rects = cairo_region_num_rectangles (shape);
for (i = 0; i < num_rects; i++)
{
cairo_rectangle_int_t rect;
cairo_region_get_rectangle (shape, i, &rect);
pika_image_select_rectangle (image, PIKA_CHANNEL_OP_ADD,
rect.x, rect.y,
rect.width, rect.height);
}
pika_selection_invert (image);
}
/* Create a PikaImage from a GdkPixbuf */
static PikaImage *
create_image (cairo_surface_t *surface,
cairo_region_t *shape,
const gchar *name)
{
PikaImage *image;
PikaLayer *layer;
gdouble xres, yres;
gint width, height;
pika_progress_init (_("Importing screenshot"));
width = cairo_image_surface_get_width (surface);
height = cairo_image_surface_get_height (surface);
image = pika_image_new (width, height, PIKA_RGB);
pika_image_undo_disable (image);
pika_get_monitor_resolution (&xres, &yres);
pika_image_set_resolution (image, xres, yres);
layer = pika_layer_new_from_surface (image,
name ? name : _("Screenshot"),
surface,
0.0, 1.0);
pika_image_insert_layer (image, layer, NULL, 0);
if (shape && ! cairo_region_is_empty (shape))
{
image_select_shape (image, shape);
if (! pika_selection_is_empty (image))
{
pika_layer_add_alpha (layer);
pika_drawable_edit_clear (PIKA_DRAWABLE (layer));
pika_selection_none (image);
}
}
pika_image_undo_enable (image);
return image;
}
static void
add_cursor_image (PikaImage *image,
GdkDisplay *display)
{
#ifdef HAVE_XFIXES
XFixesCursorImage *cursor;
GeglBuffer *buffer;
GeglBufferIterator *iter;
GeglRectangle *roi;
PikaLayer *layer;
GList *selected;
cursor = XFixesGetCursorImage (GDK_DISPLAY_XDISPLAY (display));
if (!cursor)
return;
selected = pika_image_list_selected_layers (image);
layer = pika_layer_new (image, _("Mouse Pointer"),
cursor->width, cursor->height,
PIKA_RGBA_IMAGE,
100.0,
pika_image_get_default_new_layer_mode (image));
buffer = pika_drawable_get_buffer (PIKA_DRAWABLE (layer));
iter = gegl_buffer_iterator_new (buffer,
GEGL_RECTANGLE (0, 0,
pika_drawable_get_width (PIKA_DRAWABLE (layer)),
pika_drawable_get_height (PIKA_DRAWABLE (layer))),
0, babl_format ("R'G'B'A u8"),
GEGL_ACCESS_READWRITE, GEGL_ABYSS_NONE, 1);
roi = &iter->items[0].roi;
while (gegl_buffer_iterator_next (iter))
{
const gulong *src = cursor->pixels + roi->y * cursor->width + roi->x;
guchar *dest = iter->items[0].data;
gint x, y;
for (y = 0; y < roi->height; y++)
{
const gulong *s = src;
guchar *d = dest;
for (x = 0; x < roi->width; x++)
{
/* the cursor pixels are pre-multiplied ARGB */
guint a = (*s >> 24) & 0xff;
guint r = (*s >> 16) & 0xff;
guint g = (*s >> 8) & 0xff;
guint b = (*s >> 0) & 0xff;
d[0] = a ? (r * 255) / a : r;
d[1] = a ? (g * 255) / a : g;
d[2] = a ? (b * 255) / a : b;
d[3] = a;
s++;
d += 4;
}
src += cursor->width;
dest += 4 * roi->width;
}
}
g_object_unref (buffer);
pika_image_insert_layer (image, layer, NULL, -1);
pika_layer_set_offsets (layer,
cursor->x - cursor->xhot, cursor->y - cursor->yhot);
pika_image_take_selected_layers (image, selected);
#endif
}
/* The main Screenshot function */
gboolean
screenshot_x11_available (void)
{
return (gdk_display_get_default () &&
GDK_IS_X11_DISPLAY (gdk_display_get_default ()));
}
ScreenshotCapabilities
screenshot_x11_get_capabilities (void)
{
ScreenshotCapabilities capabilities = SCREENSHOT_CAN_PICK_NONINTERACTIVELY;
#ifdef HAVE_X11_XMU_WINUTIL_H
capabilities |= SCREENSHOT_CAN_SHOOT_DECORATIONS;
#endif
#ifdef HAVE_XFIXES
capabilities |= SCREENSHOT_CAN_SHOOT_POINTER;
#endif
capabilities |= SCREENSHOT_CAN_SHOOT_REGION |
SCREENSHOT_CAN_SHOOT_WINDOW |
SCREENSHOT_CAN_PICK_WINDOW |
SCREENSHOT_CAN_DELAY_WINDOW_SHOT;
return capabilities;
}
PikaPDBStatusType
screenshot_x11_shoot (ScreenshotValues *shootvals,
GdkMonitor *monitor,
PikaImage **image,
GError **error)
{
GdkDisplay *display;
GdkScreen *screen;
GdkWindow *window;
cairo_surface_t *screenshot;
cairo_region_t *shape = NULL;
cairo_t *cr;
PikaColorProfile *profile;
GdkRectangle rect;
GdkRectangle screen_rect;
gchar *name = NULL;
gint x, y;
/* use default screen if we are running non-interactively */
if (monitor == NULL)
monitor = gdk_display_get_monitor (gdk_display_get_default (), 0);
if (shootvals->shoot_type != SHOOT_ROOT && ! shootvals->window_id)
{
if (shootvals->select_delay > 0)
screenshot_delay (shootvals->select_delay);
shootvals->window_id = select_window (shootvals, monitor);
if (! shootvals->window_id)
return PIKA_PDB_CANCEL;
}
if (shootvals->screenshot_delay > 0)
screenshot_delay (shootvals->screenshot_delay);
display = gdk_monitor_get_display (monitor);
screen = gdk_display_get_default_screen (display);
if (shootvals->shoot_type == SHOOT_REGION)
{
rect.x = MIN (shootvals->x1, shootvals->x2);
rect.y = MIN (shootvals->y1, shootvals->y2);
rect.width = ABS (shootvals->x2 - shootvals->x1);
rect.height = ABS (shootvals->y2 - shootvals->y1);
monitor = gdk_display_get_monitor_at_point (display,
rect.x + rect.width / 2,
rect.y + rect.height / 2);
}
else
{
if (shootvals->shoot_type == SHOOT_ROOT)
{
window = gdk_screen_get_root_window (screen);
/* FIXME: figure monitor */
}
else
{
window = gdk_x11_window_foreign_new_for_display (display,
shootvals->window_id);
monitor = gdk_display_get_monitor_at_window (display, window);
}
if (! window)
{
g_set_error_literal (error, 0, 0, _("Specified window not found"));
return PIKA_PDB_EXECUTION_ERROR;
}
rect.width = gdk_window_get_width (window);
rect.height = gdk_window_get_height (window);
gdk_window_get_origin (window, &x, &y);
rect.x = x;
rect.y = y;
}
window = gdk_screen_get_root_window (screen);
gdk_window_get_origin (window, &screen_rect.x, &screen_rect.y);
screen_rect.width = gdk_window_get_width (window);
screen_rect.height = gdk_window_get_height (window);
if (! gdk_rectangle_intersect (&rect, &screen_rect, &rect))
return PIKA_PDB_EXECUTION_ERROR;
screenshot = cairo_image_surface_create (CAIRO_FORMAT_RGB24,
rect.width, rect.height);
cr = cairo_create (screenshot);
gdk_cairo_set_source_window (cr, window,
- (rect.x - screen_rect.x),
- (rect.y - screen_rect.y));
cairo_paint (cr);
cairo_destroy (cr);
gdk_display_beep (display);
if (shootvals->shoot_type == SHOOT_WINDOW)
{
name = window_get_title (display, shootvals->window_id);
shape = window_get_shape (monitor, shootvals->window_id);
if (shape)
cairo_region_translate (shape, x - rect.x, y - rect.y);
}
*image = create_image (screenshot, shape, name);
cairo_surface_destroy (screenshot);
if (shape)
cairo_region_destroy (shape);
g_free (name);
/* FIXME: Some time might have passed until we get here.
* The cursor image should be grabbed together with the screenshot.
*/
if ((shootvals->shoot_type == SHOOT_ROOT ||
shootvals->shoot_type == SHOOT_WINDOW) && shootvals->show_cursor)
add_cursor_image (*image, display);
profile = pika_monitor_get_color_profile (monitor);
if (profile)
{
pika_image_set_color_profile (*image, profile);
g_object_unref (profile);
}
return PIKA_PDB_SUCCESS;
}
#endif /* GDK_WINDOWING_X11 */
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