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PIKApp
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PIKApp/app/widgets/pikacursor.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
*
* 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 <gtk/gtk.h>
#ifdef GDK_WINDOWING_QUARTZ
#include <gdk/gdkquartz.h>
#endif
#ifdef GDK_WINDOWING_WAYLAND
#include <gdk/gdkwayland.h>
#endif
#include "widgets-types.h"
#include "pikacursor.h"
#define cursor_default_hot_x 10
#define cursor_default_hot_y 10
#define cursor_mouse_hot_x 3
#define cursor_mouse_hot_y 2
#define cursor_crosshair_hot_x 15
#define cursor_crosshair_hot_y 15
#define cursor_zoom_hot_x 8
#define cursor_zoom_hot_y 8
#define cursor_color_picker_hot_x 1
#define cursor_color_picker_hot_y 30
typedef struct _PikaCursor PikaCursor;
struct _PikaCursor
{
const gchar *resource_name;
const gint hot_x;
const gint hot_y;
GdkPixbuf *pixbuf;
GdkPixbuf *pixbuf_x2;
};
static PikaCursor pika_cursors[] =
{
/* these have to match up with enum PikaCursorType in widgets-enums.h */
{
"cursor-none",
cursor_default_hot_x, cursor_default_hot_y
},
{
"cursor-mouse",
cursor_mouse_hot_x, cursor_mouse_hot_y
},
{
"cursor-crosshair",
cursor_crosshair_hot_x, cursor_crosshair_hot_y
},
{
"cursor-crosshair-small",
cursor_default_hot_x, cursor_default_hot_y
},
{
"cursor-bad",
cursor_default_hot_x, cursor_default_hot_y
},
{
"cursor-move",
cursor_default_hot_x, cursor_default_hot_y
},
{
"cursor-zoom",
cursor_zoom_hot_x, cursor_zoom_hot_y
},
{
"cursor-color-picker",
cursor_color_picker_hot_x, cursor_color_picker_hot_y
},
{
"cursor-corner-top",
cursor_default_hot_x, cursor_default_hot_y
},
{
"cursor-corner-top-right",
cursor_default_hot_x, cursor_default_hot_y
},
{
"cursor-corner-right",
cursor_default_hot_x, cursor_default_hot_y
},
{
"cursor-corner-bottom-right",
cursor_default_hot_x, cursor_default_hot_y
},
{
"cursor-corner-bottom",
cursor_default_hot_x, cursor_default_hot_y
},
{
"cursor-corner-bottom-left",
cursor_default_hot_x, cursor_default_hot_y
},
{
"cursor-corner-left",
cursor_default_hot_x, cursor_default_hot_y
},
{
"cursor-corner-top-left",
cursor_default_hot_x, cursor_default_hot_y
},
{
"cursor-side-top",
cursor_default_hot_x, cursor_default_hot_y
},
{
"cursor-side-top-right",
cursor_default_hot_x, cursor_default_hot_y
},
{
"cursor-side-right",
cursor_default_hot_x, cursor_default_hot_y
},
{
"cursor-side-bottom-right",
cursor_default_hot_x, cursor_default_hot_y
},
{
"cursor-side-bottom",
cursor_default_hot_x, cursor_default_hot_y
},
{
"cursor-side-bottom-left",
cursor_default_hot_x, cursor_default_hot_y
},
{
"cursor-side-left",
cursor_default_hot_x, cursor_default_hot_y
},
{
"cursor-side-top-left",
cursor_default_hot_x, cursor_default_hot_y
},
{
"cursor-single-dot",
cursor_default_hot_x, cursor_default_hot_y
}
};
static PikaCursor pika_tool_cursors[] =
{
/* these have to match up with enum PikaToolCursorType in widgets-enums.h */
{ NULL },
{ "tool-rect-select" },
{ "tool-ellipse-select" },
{ "tool-free-select" },
{ "tool-polygon-select" },
{ "tool-fuzzy-select" },
{ "tool-paths" },
{ "tool-paths-anchor" },
{ "tool-paths-control" },
{ "tool-paths-segment" },
{ "tool-iscissors" },
{ "tool-move" },
{ "tool-zoom" },
{ "tool-crop" },
{ "tool-resize" },
{ "tool-rotate" },
{ "tool-shear" },
{ "tool-perspective" },
{ "tool-transform-3d-camera" },
{ "tool-flip-horizontal" },
{ "tool-flip-vertical" },
{ "tool-text" },
{ "tool-color-picker" },
{ "tool-bucket-fill" },
{ "tool-gradient" },
{ "tool-pencil" },
{ "tool-paintbrush" },
{ "tool-airbrush" },
{ "tool-ink" },
{ "tool-clone" },
{ "tool-heal" },
{ "tool-eraser" },
{ "tool-smudge" },
{ "tool-blur" },
{ "tool-dodge" },
{ "tool-burn" },
{ "tool-measure" },
{ "tool-warp" },
{ "tool-hand" }
};
static PikaCursor pika_cursor_modifiers[] =
{
/* these have to match up with enum PikaCursorModifier in widgets-enums.h */
{ NULL },
{ "modifier-bad" },
{ "modifier-plus" },
{ "modifier-minus" },
{ "modifier-intersect" },
{ "modifier-move" },
{ "modifier-resize" },
{ "modifier-rotate" },
{ "modifier-zoom" },
{ "modifier-control" },
{ "modifier-anchor" },
{ "modifier-foreground" },
{ "modifier-background" },
{ "modifier-pattern" },
{ "modifier-join" },
{ "modifier-select" }
};
static const GdkPixbuf *
get_cursor_pixbuf (PikaCursor *cursor,
gint scale_factor)
{
gchar *resource_path;
GError *error = NULL;
if (! cursor->pixbuf)
{
resource_path = g_strconcat ("/technology.heckin/tool-cursors/",
cursor->resource_name,
".png", NULL);
cursor->pixbuf = gdk_pixbuf_new_from_resource (resource_path, &error);
if (! cursor->pixbuf)
{
g_critical ("Failed to create cursor image '%s': %s",
resource_path, error->message);
g_clear_error (&error);
}
g_free (resource_path);
}
if (scale_factor == 2 && ! cursor->pixbuf_x2)
{
resource_path = g_strconcat ("/technology.heckin/tool-cursors/",
cursor->resource_name,
"-x2.png", NULL);
cursor->pixbuf_x2 = gdk_pixbuf_new_from_resource (resource_path, &error);
if (! cursor->pixbuf_x2)
{
/* no critical here until we actually have the cursor files */
g_printerr ("Failed to create scaled cursor image '%s' "
"falling back to upscaling default cursor: %s\n",
resource_path, error->message);
g_clear_error (&error);
if (cursor->pixbuf)
{
gint width = gdk_pixbuf_get_width (cursor->pixbuf);
gint height = gdk_pixbuf_get_height (cursor->pixbuf);
cursor->pixbuf_x2 = gdk_pixbuf_scale_simple (cursor->pixbuf,
width * 2,
height * 2,
GDK_INTERP_NEAREST);
}
}
g_free (resource_path);
}
if (scale_factor == 2)
return cursor->pixbuf_x2;
else
return cursor->pixbuf;
}
GdkCursor *
pika_cursor_new (GdkWindow *window,
PikaHandedness cursor_handedness,
PikaCursorType cursor_type,
PikaToolCursorType tool_cursor,
PikaCursorModifier modifier)
{
GdkDisplay *display;
PikaCursor *bmcursor = NULL;
PikaCursor *bmmodifier = NULL;
PikaCursor *bmtool = NULL;
GdkCursor *cursor;
GdkPixbuf *pixbuf;
gint scale_factor;
gint hot_x;
gint hot_y;
g_return_val_if_fail (GDK_IS_WINDOW (window), NULL);
g_return_val_if_fail (cursor_type < PIKA_CURSOR_LAST, NULL);
display = gdk_window_get_display (window);
if (cursor_type <= (PikaCursorType) GDK_LAST_CURSOR)
return gdk_cursor_new_for_display (display, (GdkCursorType) cursor_type);
g_return_val_if_fail (cursor_type >= PIKA_CURSOR_NONE, NULL);
/* disallow the small tool cursor with some cursors
*/
if (cursor_type <= PIKA_CURSOR_NONE ||
cursor_type == PIKA_CURSOR_CROSSHAIR ||
cursor_type == PIKA_CURSOR_ZOOM ||
cursor_type == PIKA_CURSOR_COLOR_PICKER ||
cursor_type >= PIKA_CURSOR_LAST)
{
tool_cursor = PIKA_TOOL_CURSOR_NONE;
}
/* don't allow anything with the empty cursor
*/
if (cursor_type == PIKA_CURSOR_NONE)
{
tool_cursor = PIKA_TOOL_CURSOR_NONE;
modifier = PIKA_CURSOR_MODIFIER_NONE;
}
/* some more sanity checks
*/
if (cursor_type == PIKA_CURSOR_MOVE &&
modifier == PIKA_CURSOR_MODIFIER_MOVE)
{
modifier = PIKA_CURSOR_MODIFIER_NONE;
}
/* when cursor is "corner" or "side" sides must be exchanged for
* left-hand-mice-flipping of pixbuf below
*/
if (cursor_handedness == PIKA_HANDEDNESS_LEFT)
{
switch (cursor_type)
{
case PIKA_CURSOR_CORNER_TOP_LEFT:
cursor_type = PIKA_CURSOR_CORNER_TOP_RIGHT; break;
case PIKA_CURSOR_CORNER_TOP_RIGHT:
cursor_type = PIKA_CURSOR_CORNER_TOP_LEFT; break;
case PIKA_CURSOR_CORNER_LEFT:
cursor_type = PIKA_CURSOR_CORNER_RIGHT; break;
case PIKA_CURSOR_CORNER_RIGHT:
cursor_type = PIKA_CURSOR_CORNER_LEFT; break;
case PIKA_CURSOR_CORNER_BOTTOM_LEFT:
cursor_type = PIKA_CURSOR_CORNER_BOTTOM_RIGHT; break;
case PIKA_CURSOR_CORNER_BOTTOM_RIGHT:
cursor_type = PIKA_CURSOR_CORNER_BOTTOM_LEFT; break;
case PIKA_CURSOR_SIDE_TOP_LEFT:
cursor_type = PIKA_CURSOR_SIDE_TOP_RIGHT; break;
case PIKA_CURSOR_SIDE_TOP_RIGHT:
cursor_type = PIKA_CURSOR_SIDE_TOP_LEFT; break;
case PIKA_CURSOR_SIDE_LEFT:
cursor_type = PIKA_CURSOR_SIDE_RIGHT; break;
case PIKA_CURSOR_SIDE_RIGHT:
cursor_type = PIKA_CURSOR_SIDE_LEFT; break;
case PIKA_CURSOR_SIDE_BOTTOM_LEFT:
cursor_type = PIKA_CURSOR_SIDE_BOTTOM_RIGHT; break;
case PIKA_CURSOR_SIDE_BOTTOM_RIGHT:
cursor_type = PIKA_CURSOR_SIDE_BOTTOM_LEFT; break;
default:
break;
}
}
/* prepare the main cursor */
cursor_type -= PIKA_CURSOR_NONE;
bmcursor = &pika_cursors[cursor_type];
/* prepare the tool cursor */
if (tool_cursor > PIKA_TOOL_CURSOR_NONE &&
tool_cursor < PIKA_TOOL_CURSOR_LAST)
{
bmtool = &pika_tool_cursors[tool_cursor];
}
/* prepare the cursor modifier */
if (modifier > PIKA_CURSOR_MODIFIER_NONE &&
modifier < PIKA_CURSOR_MODIFIER_LAST)
{
bmmodifier = &pika_cursor_modifiers[modifier];
}
scale_factor = gdk_window_get_scale_factor (window);
/* we only support x2 scaling right now */
scale_factor = CLAMP (scale_factor, 1, 2);
pixbuf = gdk_pixbuf_copy (get_cursor_pixbuf (bmcursor, scale_factor));
if (bmmodifier || bmtool)
{
gint width = gdk_pixbuf_get_width (pixbuf);
gint height = gdk_pixbuf_get_height (pixbuf);
if (bmmodifier)
gdk_pixbuf_composite (get_cursor_pixbuf (bmmodifier, scale_factor),
pixbuf,
0, 0, width, height,
0.0, 0.0, 1.0, 1.0,
GDK_INTERP_NEAREST, 200);
if (bmtool)
gdk_pixbuf_composite (get_cursor_pixbuf (bmtool, scale_factor),
pixbuf,
0, 0, width, height,
0.0, 0.0, 1.0, 1.0,
GDK_INTERP_NEAREST, 200);
}
hot_x = bmcursor->hot_x;
hot_y = bmcursor->hot_y;
/* flip the cursor if mouse setting is left-handed */
if (cursor_handedness == PIKA_HANDEDNESS_LEFT)
{
GdkPixbuf *flipped = gdk_pixbuf_flip (pixbuf, TRUE);
gint width = gdk_pixbuf_get_width (flipped);
g_object_unref (pixbuf);
pixbuf = flipped;
hot_x = (width - 1) - hot_x;
}
if (scale_factor > 1)
{
gint hot_x_scaled = hot_x;
gint hot_y_scaled = hot_y;
cairo_surface_t *surface =
gdk_cairo_surface_create_from_pixbuf (pixbuf, scale_factor, NULL);
/*
* MacOS needs the hotspot in surface coordinates
* X11 needs the hotspot in pixel coordinates (not scaled)
* Windows doesn't handle scaled cursors at all
* Broadway does not appear to support surface cursors at all,
* let alone scaled surface cursors.
* https://gitlab.gnome.org/GNOME/pika/-/merge_requests/545#note_1388777
*/
if (FALSE ||
#ifdef GDK_WINDOWING_QUARTZ
GDK_IS_QUARTZ_DISPLAY (display) ||
#endif
FALSE)
{
hot_x_scaled *= scale_factor;
hot_y_scaled *= scale_factor;
}
cursor = gdk_cursor_new_from_surface (display,
surface,
hot_x_scaled,
hot_y_scaled);
cairo_surface_destroy (surface);
}
else
{
cursor = gdk_cursor_new_from_pixbuf (display, pixbuf, hot_x, hot_y);
}
g_object_unref (pixbuf);
return cursor;
}
void
pika_cursor_set (GtkWidget *widget,
PikaHandedness cursor_handedness,
PikaCursorType cursor_type,
PikaToolCursorType tool_cursor,
PikaCursorModifier modifier)
{
GdkWindow *window;
GdkCursor *cursor;
g_return_if_fail (GTK_IS_WIDGET (widget));
g_return_if_fail (gtk_widget_get_realized (widget));
window = gtk_widget_get_window (widget);
cursor = pika_cursor_new (window,
cursor_handedness,
cursor_type,
tool_cursor,
modifier);
gdk_window_set_cursor (window, cursor);
g_object_unref (cursor);
gdk_display_flush (gdk_window_get_display (window));
}
PikaCursorType
pika_cursor_rotate (PikaCursorType cursor,
gdouble angle)
{
if (cursor >= PIKA_CURSOR_CORNER_TOP &&
cursor <= PIKA_CURSOR_SIDE_TOP_LEFT)
{
gint offset = (gint) (angle / 45 + 0.5);
if (cursor < PIKA_CURSOR_SIDE_TOP)
{
cursor += offset;
if (cursor > PIKA_CURSOR_CORNER_TOP_LEFT)
cursor -= 8;
}
else
{
cursor += offset;
if (cursor > PIKA_CURSOR_SIDE_TOP_LEFT)
cursor -= 8;
}
}
return cursor;
}
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