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gtk2/gdk/win32/gdkcursor-win32.c
Руслан Ижбулатов d8da6d38db GDK W32: New cursor class 
Instead of now-unused GdkWin32Cursor class (a subclass of GdkCursor),
add a stand-alone GdkWin32HCursor class that is a wrapper around
HCURSOR handle.

On creation it's given a display instance, a HCURSOR handle and a boolean
that indicates whether the HCURSOR handle can or cannot be destroyed
(this depends on how the handle was obtained).
That information is stored in a hash table inside the GdkWin32Display
singleton, each entry of that table has reference count.
When the GdkWin32HCursor object is finalized, it reduces the reference
count on the table entry in the GdkWin32Display. When it's created,
it either adds such an entry or refs an existing one.
This way two pieces of code (or the same piece of code called
multiple times) that independently obtain the same HCURSOR from the OS
will get to different GdkWin32HCursor instances, but GdkWin32Display
will know that both use the same handle.

Once the reference count reaches 0 on the table entry, it is freed
and the handle (if destroyable) is put on the destruction list,
and an idle destruction function is queued.

If the same handle is once again registered for use before the
idle destructior is invoked (this happens, for example, when
an old cursor is destroyed and then replaced with a new one),
the handle gets removed from the destruction list.

The destructor just calls DestroyCursor() on each handle, calling
SetCursor(NULL) before doing that when the handle is in use.
This ensures that SetCursor(NULL) (which will cause cursor to disappear,
which is bad by itself, and which will also cause flickering if the
cursor is set to a non-NULL again shortly afterward)
is almost never called, unless GTK messes up and keeps using a cursor
beyond its lifetime.

This scheme also ensures that non-destructable cursors are not destroyed.

It's also possible to call _gdk_win32_display_hcursor_ref()
and _gdk_win32_display_hcursor_unref() manually instead of creating
GdkWin32HCursor objects, but that is not recommended.
2018-03-29 23:59:14 +00:00

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/* GDK - The GIMP Drawing Kit
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
* Copyright (C) 1998-2002 Tor Lillqvist
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* 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
* Lesser 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"
#define GDK_PIXBUF_ENABLE_BACKEND /* Ugly? */
#include "gdkdisplay.h"
#include "gdkcursor.h"
#include "gdkwin32.h"
#include "gdktextureprivate.h"
#include "gdkintl.h"
#include "gdkdisplay-win32.h"
#ifdef __MINGW32__
#include <w32api.h>
#endif
#include "xcursors.h"
typedef struct _DefaultCursor {
char *name;
char *id;
} DefaultCursor;
static DefaultCursor default_cursors[] = {
{ "appstarting", IDC_APPSTARTING },
{ "arrow", IDC_ARROW },
{ "cross", IDC_CROSS },
{ "hand", IDC_HAND },
{ "help", IDC_HELP },
{ "ibeam", IDC_IBEAM },
/* an X cursor name, for compatibility with GTK: */
{ "left_ptr_watch", IDC_APPSTARTING },
{ "sizeall", IDC_SIZEALL },
{ "sizenesw", IDC_SIZENESW },
{ "sizens", IDC_SIZENS },
{ "sizenwse", IDC_SIZENWSE },
{ "sizewe", IDC_SIZEWE },
{ "uparrow", IDC_UPARROW },
{ "wait", IDC_WAIT },
/* css cursor names: */
{ "default", IDC_ARROW },
{ "pointer", IDC_HAND },
{ "progress", IDC_APPSTARTING },
{ "crosshair", IDC_CROSS },
{ "text", IDC_IBEAM },
{ "move", IDC_SIZEALL },
{ "not-allowed", IDC_NO },
{ "ew-resize", IDC_SIZEWE },
{ "e-resize", IDC_SIZEWE },
{ "w-resize", IDC_SIZEWE },
{ "col-resize", IDC_SIZEWE },
{ "ns-resize", IDC_SIZENS },
{ "n-resize", IDC_SIZENS },
{ "s-resize", IDC_SIZENS },
{ "row-resize", IDC_SIZENS },
{ "nesw-resize", IDC_SIZENESW },
{ "ne-resize", IDC_SIZENESW },
{ "sw-resize", IDC_SIZENESW },
{ "nwse-resize", IDC_SIZENWSE },
{ "nw-resize", IDC_SIZENWSE },
{ "se-resize", IDC_SIZENWSE }
};
typedef struct _GdkWin32HCursorTableEntry GdkWin32HCursorTableEntry;
struct _GdkWin32HCursorTableEntry
{
HCURSOR handle;
guint64 refcount;
gboolean destroyable;
};
struct _GdkWin32HCursor
{
GObject parent_instance;
/* Do not do any modifications to the handle
* (i.e. do not call DestroyCursor() on it).
* It's a "read-only" copy, the original is stored
* in the display instance.
*/
HANDLE readonly_handle;
/* This is a way to access the real handle stored
* in the display.
* TODO: make it a weak reference
*/
GdkWin32Display *display;
/* A copy of the "destoyable" attribute of the handle */
gboolean readonly_destroyable;
};
struct _GdkWin32HCursorClass
{
GObjectClass parent_class;
};
enum
{
PROP_0,
PROP_DISPLAY,
PROP_HANDLE,
PROP_DESTROYABLE,
NUM_PROPERTIES
};
G_DEFINE_TYPE (GdkWin32HCursor, gdk_win32_hcursor, G_TYPE_OBJECT)
static void
gdk_win32_hcursor_init (GdkWin32HCursor *win32_hcursor)
{
}
static void
gdk_win32_hcursor_finalize (GObject *gobject)
{
GdkWin32HCursor *win32_hcursor = GDK_WIN32_HCURSOR (gobject);
if (win32_hcursor->display)
_gdk_win32_display_hcursor_unref (win32_hcursor->display, win32_hcursor->readonly_handle);
g_clear_object (&win32_hcursor->display);
G_OBJECT_CLASS (gdk_win32_hcursor_parent_class)->finalize (G_OBJECT (win32_hcursor));
}
static void
gdk_win32_hcursor_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GdkWin32HCursor *win32_hcursor;
win32_hcursor = GDK_WIN32_HCURSOR (object);
switch (prop_id)
{
case PROP_DISPLAY:
g_set_object (&win32_hcursor->display, g_value_get_object (value));
break;
case PROP_DESTROYABLE:
win32_hcursor->readonly_destroyable = g_value_get_boolean (value);
break;
case PROP_HANDLE:
win32_hcursor->readonly_handle = g_value_get_pointer (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gdk_win32_hcursor_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GdkWin32HCursor *win32_hcursor;
win32_hcursor = GDK_WIN32_HCURSOR (object);
switch (prop_id)
{
case PROP_DISPLAY:
g_value_set_object (value, win32_hcursor->display);
break;
case PROP_DESTROYABLE:
g_value_set_boolean (value, win32_hcursor->readonly_destroyable);
break;
case PROP_HANDLE:
g_value_set_pointer (value, win32_hcursor->readonly_handle);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gdk_win32_hcursor_constructed (GObject *object)
{
GdkWin32HCursor *win32_hcursor;
win32_hcursor = GDK_WIN32_HCURSOR (object);
g_assert_nonnull (win32_hcursor->display);
g_assert_nonnull (win32_hcursor->readonly_handle);
_gdk_win32_display_hcursor_ref (win32_hcursor->display,
win32_hcursor->readonly_handle,
win32_hcursor->readonly_destroyable);
}
static GParamSpec *hcursor_props[NUM_PROPERTIES] = { NULL, };
static void
gdk_win32_hcursor_class_init (GdkWin32HCursorClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->finalize = gdk_win32_hcursor_finalize;
object_class->constructed = gdk_win32_hcursor_constructed;
object_class->get_property = gdk_win32_hcursor_get_property;
object_class->set_property = gdk_win32_hcursor_set_property;
hcursor_props[PROP_DISPLAY] =
g_param_spec_object ("display",
P_("Display"),
P_("The display that will use this cursor"),
GDK_TYPE_DISPLAY,
G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE);
hcursor_props[PROP_HANDLE] =
g_param_spec_pointer ("handle",
P_("Handle"),
P_("The HCURSOR handle for this cursor"),
G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE);
hcursor_props[PROP_DESTROYABLE] =
g_param_spec_boolean ("destroyable",
P_("Destroyable"),
P_("Whether calling DestroyCursor() is allowed on this cursor"),
TRUE,
G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE);
g_object_class_install_properties (object_class, NUM_PROPERTIES, hcursor_props);
}
GdkWin32HCursor *
gdk_win32_hcursor_new (GdkWin32Display *display,
HCURSOR handle,
gboolean destroyable)
{
return g_object_new (GDK_TYPE_WIN32_HCURSOR,
"display", display,
"handle", handle,
"destroyable", destroyable,
NULL);
}
void
_gdk_win32_display_hcursor_ref (GdkWin32Display *display,
HCURSOR handle,
gboolean destroyable)
{
GdkWin32HCursorTableEntry *entry;
entry = g_hash_table_lookup (display->cursor_reftable, handle);
if (entry)
{
if (entry->destroyable != destroyable)
g_warning ("Destroyability metadata for cursor handle 0x%p does not match", handle);
entry->refcount += 1;
return;
}
entry = g_new0 (GdkWin32HCursorTableEntry, 1);
entry->handle = handle;
entry->destroyable = destroyable;
entry->refcount = 1;
g_hash_table_insert (display->cursor_reftable, handle, entry);
display->cursors_for_destruction = g_list_remove_all (display->cursors_for_destruction, handle);
}
static gboolean
delayed_cursor_destruction (gpointer user_data)
{
GdkWin32Display *win32_display = GDK_WIN32_DISPLAY (user_data);
HANDLE current_hcursor = GetCursor ();
GList *p;
win32_display->idle_cursor_destructor_id = 0;
for (p = win32_display->cursors_for_destruction; p; p = p->next)
{
HCURSOR handle = (HCURSOR) p->data;
if (handle == NULL)
continue;
if (current_hcursor == handle)
{
SetCursor (NULL);
current_hcursor = NULL;
}
if (!DestroyCursor (handle))
g_warning (G_STRLOC ": DestroyCursor (%p) failed: %lu", handle, GetLastError ());
}
g_list_free (win32_display->cursors_for_destruction);
win32_display->cursors_for_destruction = NULL;
return G_SOURCE_REMOVE;
}
void
_gdk_win32_display_hcursor_unref (GdkWin32Display *display,
HCURSOR handle)
{
GdkWin32HCursorTableEntry *entry;
gboolean destroyable;
entry = g_hash_table_lookup (display->cursor_reftable, handle);
if (!entry)
{
g_warning ("Trying to forget cursor handle 0x%p that is not in the table", handle);
return;
}
entry->refcount -= 1;
if (entry->refcount > 0)
return;
destroyable = entry->destroyable;
g_hash_table_remove (display->cursor_reftable, handle);
g_free (entry);
if (!destroyable)
return;
/* GDK tends to destroy a cursor first, then set a new one.
* This results in repeated oscillations between SetCursor(NULL)
* and SetCursor(hcursor). To avoid that, delay cursor destruction a bit
* to let GDK set a new one first. That way cursors are switched
* seamlessly, without a NULL cursor between them.
* If GDK sets the new cursor to the same handle the old cursor had,
* the cursor handle is taken off the destruction list.
*/
if (g_list_find (display->cursors_for_destruction, handle) == NULL)
{
display->cursors_for_destruction = g_list_prepend (display->cursors_for_destruction, handle);
if (display->idle_cursor_destructor_id == 0)
display->idle_cursor_destructor_id = g_idle_add (delayed_cursor_destruction, display);
}
}
#ifdef gdk_win32_hcursor_get_handle
#undef gdk_win32_hcursor_get_handle
#endif
HCURSOR
gdk_win32_hcursor_get_handle (GdkWin32HCursor *cursor)
{
return cursor->readonly_handle;
}
static HCURSOR
hcursor_from_x_cursor (gint i,
const gchar *name)
{
gint j, x, y, ofs;
HCURSOR rv;
gint w, h;
guchar *and_plane, *xor_plane;
w = GetSystemMetrics (SM_CXCURSOR);
h = GetSystemMetrics (SM_CYCURSOR);
and_plane = g_malloc ((w/8) * h);
memset (and_plane, 0xff, (w/8) * h);
xor_plane = g_malloc ((w/8) * h);
memset (xor_plane, 0, (w/8) * h);
if (strcmp (name, "none") != 0)
{
#define SET_BIT(v,b) (v |= (1 << b))
#define RESET_BIT(v,b) (v &= ~(1 << b))
for (j = 0, y = 0; y < cursors[i].height && y < h ; y++)
{
ofs = (y * w) / 8;
j = y * cursors[i].width;
for (x = 0; x < cursors[i].width && x < w ; x++, j++)
{
gint pofs = ofs + x / 8;
guchar data = (cursors[i].data[j/4] & (0xc0 >> (2 * (j%4)))) >> (2 * (3 - (j%4)));
gint bit = 7 - (j % cursors[i].width) % 8;
if (data)
{
RESET_BIT (and_plane[pofs], bit);
if (data == 1)
SET_BIT (xor_plane[pofs], bit);
}
}
}
#undef SET_BIT
#undef RESET_BIT
rv = CreateCursor (_gdk_app_hmodule, cursors[i].hotx, cursors[i].hoty,
w, h, and_plane, xor_plane);
}
else
{
rv = CreateCursor (_gdk_app_hmodule, 0, 0,
w, h, and_plane, xor_plane);
}
if (rv == NULL)
WIN32_API_FAILED ("CreateCursor");
g_free (and_plane);
g_free (xor_plane);
return rv;
}
static HCURSOR
win32_cursor_create_hcursor (Win32Cursor *cursor,
const gchar *name)
{
HCURSOR result;
switch (cursor->load_type)
{
case GDK_WIN32_CURSOR_LOAD_FROM_FILE:
result = LoadImageW (NULL,
cursor->resource_name,
IMAGE_CURSOR,
cursor->width,
cursor->height,
cursor->load_flags);
break;
case GDK_WIN32_CURSOR_LOAD_FROM_RESOURCE_NULL:
result = LoadImageA (NULL,
(const gchar *) cursor->resource_name,
IMAGE_CURSOR,
cursor->width,
cursor->height,
cursor->load_flags);
break;
case GDK_WIN32_CURSOR_LOAD_FROM_RESOURCE_THIS:
result = LoadImageA (_gdk_app_hmodule,
(const gchar *) cursor->resource_name,
IMAGE_CURSOR,
cursor->width,
cursor->height,
cursor->load_flags);
break;
case GDK_WIN32_CURSOR_CREATE:
result = hcursor_from_x_cursor (cursor->xcursor_number,
name);
break;
default:
result = NULL;
}
return result;
}
static Win32Cursor *
win32_cursor_new (GdkWin32CursorLoadType load_type,
gpointer resource_name,
gint width,
gint height,
guint load_flags,
gint xcursor_number)
{
Win32Cursor *result;
result = g_new (Win32Cursor, 1);
result->load_type = load_type;
result->resource_name = resource_name;
result->width = width;
result->height = height;
result->load_flags = load_flags;
result->xcursor_number = xcursor_number;
return result;
}
static void
win32_cursor_destroy (gpointer data)
{
Win32Cursor *cursor = data;
/* resource_name could be a resource ID (uint16_t stored as a pointer),
* which shouldn't be freed.
*/
if (cursor->load_type == GDK_WIN32_CURSOR_LOAD_FROM_FILE)
g_free (cursor->resource_name);
g_free (cursor);
}
static void
win32_cursor_theme_load_from (Win32CursorTheme *theme,
gint size,
const gchar *dir)
{
GDir *gdir;
const gchar *filename;
HCURSOR hcursor;
gdir = g_dir_open (dir, 0, NULL);
if (gdir == NULL)
return;
while ((filename = g_dir_read_name (gdir)) != NULL)
{
gchar *fullname;
gunichar2 *filenamew;
gchar *cursor_name;
gchar *dot;
Win32Cursor *cursor;
fullname = g_build_filename (dir, filename, NULL);
filenamew = g_utf8_to_utf16 (fullname, -1, NULL, NULL, NULL);
g_free (fullname);
if (filenamew == NULL)
continue;
hcursor = LoadImageW (NULL, filenamew, IMAGE_CURSOR, size, size,
LR_LOADFROMFILE | (size == 0 ? LR_DEFAULTSIZE : 0));
if (hcursor == NULL)
{
g_free (filenamew);
continue;
}
DestroyCursor (hcursor);
dot = strchr (filename, '.');
cursor_name = dot ? g_strndup (filename, dot - filename) : g_strdup (filename);
cursor = win32_cursor_new (GDK_WIN32_CURSOR_LOAD_FROM_FILE,
filenamew,
size,
size,
LR_LOADFROMFILE | (size == 0 ? LR_DEFAULTSIZE : 0),
0);
g_hash_table_insert (theme->named_cursors, cursor_name, cursor);
}
}
static void
win32_cursor_theme_load_from_dirs (Win32CursorTheme *theme,
const gchar *name,
gint size)
{
gchar *theme_dir;
const gchar * const *dirs;
gint i;
dirs = g_get_system_data_dirs ();
/* <prefix>/share/icons */
for (i = 0; dirs[i]; i++)
{
theme_dir = g_build_filename (dirs[i], "icons", name, "cursors", NULL);
win32_cursor_theme_load_from (theme, size, theme_dir);
g_free (theme_dir);
}
/* ~/.icons */
theme_dir = g_build_filename (g_get_home_dir (), "icons", name, "cursors", NULL);
win32_cursor_theme_load_from (theme, size, theme_dir);
g_free (theme_dir);
}
static void
win32_cursor_theme_load_system (Win32CursorTheme *theme,
gint size)
{
gint i;
HCURSOR hcursor;
Win32Cursor *cursor;
for (i = 0; i < G_N_ELEMENTS (cursors); i++)
{
if (cursors[i].name == NULL)
break;
hcursor = NULL;
/* Prefer W32 cursors */
if (cursors[i].builtin)
hcursor = LoadImageA (NULL, cursors[i].builtin, IMAGE_CURSOR,
size, size,
LR_SHARED | (size == 0 ? LR_DEFAULTSIZE : 0));
/* Fall back to X cursors, but only if we've got no theme cursor */
if (hcursor == NULL && g_hash_table_lookup (theme->named_cursors, cursors[i].name) == NULL)
hcursor = hcursor_from_x_cursor (i, cursors[i].name);
if (hcursor == NULL)
continue;
DestroyCursor (hcursor);
cursor = win32_cursor_new (GDK_WIN32_CURSOR_LOAD_FROM_RESOURCE_NULL,
(gpointer) cursors[i].builtin,
size,
size,
LR_SHARED | (size == 0 ? LR_DEFAULTSIZE : 0),
0);
g_hash_table_insert (theme->named_cursors,
g_strdup (cursors[i].name),
cursor);
}
for (i = 0; i < G_N_ELEMENTS (default_cursors); i++)
{
if (default_cursors[i].name == NULL)
break;
hcursor = LoadImageA (NULL, default_cursors[i].id, IMAGE_CURSOR, size, size,
LR_SHARED | (size == 0 ? LR_DEFAULTSIZE : 0));
if (hcursor == NULL)
continue;
DestroyCursor (hcursor);
cursor = win32_cursor_new (GDK_WIN32_CURSOR_LOAD_FROM_RESOURCE_NULL,
(gpointer) default_cursors[i].id,
size,
size,
LR_SHARED | (size == 0 ? LR_DEFAULTSIZE : 0),
0);
g_hash_table_insert (theme->named_cursors,
g_strdup (default_cursors[i].name),
cursor);
}
}
Win32CursorTheme *
win32_cursor_theme_load (const gchar *name,
gint size)
{
Win32CursorTheme *result = g_new0 (Win32CursorTheme, 1);
result->named_cursors = g_hash_table_new_full (g_str_hash,
g_str_equal,
g_free,
win32_cursor_destroy);
if (strcmp (name, "system") == 0)
{
win32_cursor_theme_load_from_dirs (result, "Adwaita", size);
win32_cursor_theme_load_system (result, size);
}
else
{
win32_cursor_theme_load_from_dirs (result, name, size);
}
if (g_hash_table_size (result->named_cursors) > 0)
return result;
win32_cursor_theme_destroy (result);
return NULL;
}
void
win32_cursor_theme_destroy (Win32CursorTheme *theme)
{
g_hash_table_destroy (theme->named_cursors);
g_free (theme);
}
Win32Cursor *
win32_cursor_theme_get_cursor (Win32CursorTheme *theme,
const gchar *name)
{
return g_hash_table_lookup (theme->named_cursors, name);
}
static void
gdk_win32_cursor_remove_from_cache (gpointer data, GObject *cursor)
{
GdkDisplay *display = data;
HCURSOR hcursor;
hcursor = g_hash_table_lookup (GDK_WIN32_DISPLAY (display)->cursors, cursor);
if (GetCursor () == hcursor)
SetCursor (NULL);
if (!DestroyCursor (hcursor))
g_warning (G_STRLOC ": DestroyCursor (%p) failed: %lu", hcursor, GetLastError ());
}
void
_gdk_win32_display_finalize_cursors (GdkWin32Display *display)
{
GHashTableIter iter;
gpointer cursor;
if (display->cursors)
{
g_hash_table_iter_init (&iter, display->cursors);
while (g_hash_table_iter_next (&iter, &cursor, NULL))
g_object_weak_unref (G_OBJECT (cursor),
gdk_win32_cursor_remove_from_cache,
GDK_DISPLAY (display));
g_hash_table_unref (display->cursors);
}
g_free (display->cursor_theme_name);
if (display->cursor_theme)
win32_cursor_theme_destroy (display->cursor_theme);
}
void
_gdk_win32_display_init_cursors (GdkWin32Display *display)
{
display->cursors = g_hash_table_new (gdk_cursor_hash,
gdk_cursor_equal);
display->cursor_theme_name = g_strdup ("system");
}
/* This is where we use the names mapped to the equivilants that Windows define by default */
static HCURSOR
hcursor_idc_from_name (const gchar *name)
{
int i;
for (i = 0; i < G_N_ELEMENTS (default_cursors); i++)
{
if (strcmp (default_cursors[i].name, name) != 0)
continue;
return LoadImageA (NULL, default_cursors[i].id, IMAGE_CURSOR, 0, 0,
LR_SHARED | LR_DEFAULTSIZE);
}
return NULL;
}
static HCURSOR
hcursor_x_from_name (const gchar *name)
{
gint i;
for (i = 0; i < G_N_ELEMENTS (cursors); i++)
if (cursors[i].name == NULL || strcmp (cursors[i].name, name) == 0)
return hcursor_from_x_cursor (i, name);
return NULL;
}
static HCURSOR
hcursor_from_theme (GdkDisplay *display,
const gchar *name)
{
Win32CursorTheme *theme;
Win32Cursor *theme_cursor;
GdkWin32Display *win32_display = GDK_WIN32_DISPLAY (display);
if (name == NULL)
return NULL;
theme = _gdk_win32_display_get_cursor_theme (win32_display);
theme_cursor = win32_cursor_theme_get_cursor (theme, name);
if (theme_cursor == NULL)
return NULL;
return win32_cursor_create_hcursor (theme_cursor, name);
}
static HCURSOR
hcursor_from_name (GdkDisplay *display,
const gchar *name)
{
HCURSOR hcursor;
/* Try current theme first */
hcursor = hcursor_from_theme (display, name);
if (hcursor != NULL)
return hcursor;
hcursor = hcursor_idc_from_name (name);
if (hcursor != NULL)
return hcursor;
hcursor = hcursor_x_from_name (name);
return hcursor;
}
/* Create a blank cursor */
static HCURSOR
create_blank_cursor (void)
{
gint w, h;
guchar *and_plane, *xor_plane;
HCURSOR rv;
w = GetSystemMetrics (SM_CXCURSOR);
h = GetSystemMetrics (SM_CYCURSOR);
and_plane = g_malloc ((w/8) * h);
memset (and_plane, 0xff, (w/8) * h);
xor_plane = g_malloc ((w/8) * h);
memset (xor_plane, 0, (w/8) * h);
rv = CreateCursor (_gdk_app_hmodule, 0, 0,
w, h, and_plane, xor_plane);
if (rv == NULL)
WIN32_API_FAILED ("CreateCursor");
return rv;
}
static HCURSOR
gdk_win32_cursor_create_for_name (GdkDisplay *display,
const gchar *name)
{
HCURSOR hcursor = NULL;
GdkCursor *result;
GdkWin32Display *win32_display = GDK_WIN32_DISPLAY (display);
/* Blank cursor case */
if (strcmp (name, "none") == 0)
return create_blank_cursor ();
hcursor = hcursor_from_name (display, name);
/* allow to load named cursor resources linked into the executable */
if (!hcursor)
hcursor = LoadCursor (_gdk_app_hmodule, name);
if (hcursor == NULL)
return NULL;
return hcursor;
}
static HICON
pixbuf_to_hicon (GdkPixbuf *pixbuf,
gboolean is_icon,
gint x,
gint y);
static HCURSOR
gdk_win32_cursor_create_for_texture (GdkDisplay *display,
GdkTexture *texture,
int x,
int y)
{
cairo_surface_t *surface;
GdkPixbuf *pixbuf;
gint width, height;
HICON icon;
surface = gdk_texture_download_surface (texture);
width = cairo_image_surface_get_width (surface);
height = cairo_image_surface_get_height (surface);
pixbuf = gdk_pixbuf_get_from_surface (surface, 0, 0, width, height);
icon = pixbuf_to_hicon (pixbuf, TRUE, 0, 0);
g_object_unref (pixbuf);
return (HCURSOR)icon;
}
GdkCursor *
gdk_win32_display_cursor_from_hcursor (GdkDisplay *display,
HCURSOR hcursor)
{
GHashTableIter iter;
gpointer cursor_current, hcursor_current;
GdkCursor *cursor = NULL;
GdkWin32Display *win32_display = GDK_WIN32_DISPLAY (display);
if (win32_display->cursors)
{
g_hash_table_iter_init (&iter, win32_display->cursors);
while (g_hash_table_iter_next (&iter, &cursor_current, &hcursor_current))
if ((HCURSOR)hcursor_current == hcursor)
{
cursor = (GdkCursor*) cursor_current;
break;
}
}
return cursor;
}
HCURSOR
_gdk_win32_display_get_cursor_for_surface (GdkDisplay *display,
cairo_surface_t *surface,
gdouble x,
gdouble y)
{
HCURSOR hcursor;
GdkPixbuf *pixbuf;
gint width, height;
g_return_val_if_fail (surface != NULL, NULL);
width = cairo_image_surface_get_width (surface);
height = cairo_image_surface_get_height (surface);
pixbuf = gdk_pixbuf_get_from_surface (surface,
0,
0,
width,
height);
g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), NULL);
g_return_val_if_fail (0 <= x && x < gdk_pixbuf_get_width (pixbuf), NULL);
g_return_val_if_fail (0 <= y && y < gdk_pixbuf_get_height (pixbuf), NULL);
hcursor = _gdk_win32_pixbuf_to_hcursor (pixbuf, x, y);
g_object_unref (pixbuf);
return hcursor;
}
static gboolean
_gdk_win32_cursor_update (GdkWin32Display *win32_display,
GdkCursor *cursor,
HCURSOR hcursor)
{
HCURSOR hcursor_new = NULL;
Win32CursorTheme *theme;
Win32Cursor *theme_cursor;
const gchar *name = gdk_cursor_get_name (cursor);
/* Do nothing if this is not a named cursor. */
if (name == NULL)
return FALSE;
theme = _gdk_win32_display_get_cursor_theme (win32_display);
theme_cursor = win32_cursor_theme_get_cursor (theme, name);
if (theme_cursor != NULL)
hcursor_new = win32_cursor_create_hcursor (theme_cursor, name);
if (hcursor_new == NULL)
{
g_warning (G_STRLOC ": Unable to load %s from the cursor theme", name);
hcursor_new = hcursor_idc_from_name (name);
if (hcursor_new == NULL)
hcursor_new = hcursor_x_from_name (name);
if (hcursor_new == NULL)
return FALSE;
}
if (GetCursor () == hcursor)
SetCursor (hcursor_new);
if (!DestroyCursor (hcursor))
g_warning (G_STRLOC ": DestroyCursor (%p) failed: %lu", hcursor, GetLastError ());
g_hash_table_replace (win32_display->cursors, cursor, hcursor_new);
return TRUE;
}
void
_gdk_win32_display_update_cursors (GdkWin32Display *display)
{
GHashTableIter iter;
GdkCursor *cursor;
HCURSOR hcursor;
g_hash_table_iter_init (&iter, display->cursors);
while (g_hash_table_iter_next (&iter, (gpointer *) &cursor, &hcursor))
_gdk_win32_cursor_update (display, cursor, hcursor);
}
GdkPixbuf *
gdk_win32_icon_to_pixbuf_libgtk_only (HICON hicon,
gdouble *x_hot,
gdouble *y_hot)
{
GdkPixbuf *pixbuf = NULL;
ICONINFO ii;
struct
{
BITMAPINFOHEADER bi;
RGBQUAD colors[2];
} bmi;
HDC hdc;
guchar *pixels, *bits;
gint rowstride, x, y, w, h;
if (!GDI_CALL (GetIconInfo, (hicon, &ii)))
return NULL;
if (!(hdc = CreateCompatibleDC (NULL)))
{
WIN32_GDI_FAILED ("CreateCompatibleDC");
goto out0;
}
memset (&bmi, 0, sizeof (bmi));
bmi.bi.biSize = sizeof (bmi.bi);
if (ii.hbmColor != NULL)
{
/* Colour cursor */
gboolean no_alpha;
if (!GDI_CALL (GetDIBits, (hdc, ii.hbmColor, 0, 1, NULL, (BITMAPINFO *)&bmi, DIB_RGB_COLORS)))
goto out1;
w = bmi.bi.biWidth;
h = bmi.bi.biHeight;
bmi.bi.biBitCount = 32;
bmi.bi.biCompression = BI_RGB;
bmi.bi.biHeight = -h;
bits = g_malloc0 (4 * w * h);
/* color data */
if (!GDI_CALL (GetDIBits, (hdc, ii.hbmColor, 0, h, bits, (BITMAPINFO *)&bmi, DIB_RGB_COLORS)))
goto out2;
pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8, w, h);
pixels = gdk_pixbuf_get_pixels (pixbuf);
rowstride = gdk_pixbuf_get_rowstride (pixbuf);
no_alpha = TRUE;
for (y = 0; y < h; y++)
{
for (x = 0; x < w; x++)
{
pixels[2] = bits[(x+y*w) * 4];
pixels[1] = bits[(x+y*w) * 4 + 1];
pixels[0] = bits[(x+y*w) * 4 + 2];
pixels[3] = bits[(x+y*w) * 4 + 3];
if (no_alpha && pixels[3] > 0)
no_alpha = FALSE;
pixels += 4;
}
pixels += (w * 4 - rowstride);
}
/* mask */
if (no_alpha &&
GDI_CALL (GetDIBits, (hdc, ii.hbmMask, 0, h, bits, (BITMAPINFO *)&bmi, DIB_RGB_COLORS)))
{
pixels = gdk_pixbuf_get_pixels (pixbuf);
for (y = 0; y < h; y++)
{
for (x = 0; x < w; x++)
{
pixels[3] = 255 - bits[(x + y * w) * 4];
pixels += 4;
}
pixels += (w * 4 - rowstride);
}
}
}
else
{
/* B&W cursor */
int bpl;
if (!GDI_CALL (GetDIBits, (hdc, ii.hbmMask, 0, 0, NULL, (BITMAPINFO *)&bmi, DIB_RGB_COLORS)))
goto out1;
w = bmi.bi.biWidth;
h = ABS (bmi.bi.biHeight) / 2;
bits = g_malloc0 (4 * w * h);
/* masks */
if (!GDI_CALL (GetDIBits, (hdc, ii.hbmMask, 0, h*2, bits, (BITMAPINFO *)&bmi, DIB_RGB_COLORS)))
goto out2;
pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8, w, h);
pixels = gdk_pixbuf_get_pixels (pixbuf);
rowstride = gdk_pixbuf_get_rowstride (pixbuf);
bpl = ((w-1)/32 + 1)*4;
#if 0
for (y = 0; y < h*2; y++)
{
for (x = 0; x < w; x++)
{
const gint bit = 7 - (x % 8);
printf ("%c ", ((bits[bpl*y+x/8])&(1<<bit)) ? ' ' : 'X');
}
printf ("\n");
}
#endif
for (y = 0; y < h; y++)
{
const guchar *andp, *xorp;
if (bmi.bi.biHeight < 0)
{
andp = bits + bpl*y;
xorp = bits + bpl*(h+y);
}
else
{
andp = bits + bpl*(h-y-1);
xorp = bits + bpl*(h+h-y-1);
}
for (x = 0; x < w; x++)
{
const gint bit = 7 - (x % 8);
if ((*andp) & (1<<bit))
{
if ((*xorp) & (1<<bit))
pixels[2] = pixels[1] = pixels[0] = 0xFF;
else
pixels[2] = pixels[1] = pixels[0] = 0;
pixels[3] = 0xFF;
}
else
{
pixels[2] = pixels[1] = pixels[0] = 0;
pixels[3] = 0;
}
pixels += 4;
if (bit == 0)
{
andp++;
xorp++;
}
}
pixels += (w * 4 - rowstride);
}
}
if (x_hot)
*x_hot = ii.xHotspot;
if (y_hot)
*y_hot = ii.yHotspot;
/* release temporary resources */
out2:
g_free (bits);
out1:
DeleteDC (hdc);
out0:
DeleteObject (ii.hbmColor);
DeleteObject (ii.hbmMask);
return pixbuf;
}
/* Convert a pixbuf to an HICON (or HCURSOR). Supports alpha under
* Windows XP, thresholds alpha otherwise. Also used from
* gdksurface-win32.c for creating application icons.
*/
static HBITMAP
create_alpha_bitmap (gint size,
guchar **outdata)
{
BITMAPV5HEADER bi;
HDC hdc;
HBITMAP hBitmap;
ZeroMemory (&bi, sizeof (BITMAPV5HEADER));
bi.bV5Size = sizeof (BITMAPV5HEADER);
bi.bV5Height = bi.bV5Width = size;
bi.bV5Planes = 1;
bi.bV5BitCount = 32;
bi.bV5Compression = BI_BITFIELDS;
/* The following mask specification specifies a supported 32 BPP
* alpha format for Windows XP (BGRA format).
*/
bi.bV5RedMask = 0x00FF0000;
bi.bV5GreenMask = 0x0000FF00;
bi.bV5BlueMask = 0x000000FF;
bi.bV5AlphaMask = 0xFF000000;
/* Create the DIB section with an alpha channel. */
hdc = GetDC (NULL);
if (!hdc)
{
WIN32_GDI_FAILED ("GetDC");
return NULL;
}
hBitmap = CreateDIBSection (hdc, (BITMAPINFO *)&bi, DIB_RGB_COLORS,
(PVOID *) outdata, NULL, (DWORD)0);
if (hBitmap == NULL)
WIN32_GDI_FAILED ("CreateDIBSection");
ReleaseDC (NULL, hdc);
return hBitmap;
}
static HBITMAP
create_color_bitmap (gint size,
guchar **outdata,
gint bits)
{
struct {
BITMAPV4HEADER bmiHeader;
RGBQUAD bmiColors[2];
} bmi;
HDC hdc;
HBITMAP hBitmap;
ZeroMemory (&bmi, sizeof (bmi));
bmi.bmiHeader.bV4Size = sizeof (BITMAPV4HEADER);
bmi.bmiHeader.bV4Height = bmi.bmiHeader.bV4Width = size;
bmi.bmiHeader.bV4Planes = 1;
bmi.bmiHeader.bV4BitCount = bits;
bmi.bmiHeader.bV4V4Compression = BI_RGB;
/* when bits is 1, these will be used.
* bmiColors[0] already zeroed from ZeroMemory()
*/
bmi.bmiColors[1].rgbBlue = 0xFF;
bmi.bmiColors[1].rgbGreen = 0xFF;
bmi.bmiColors[1].rgbRed = 0xFF;
hdc = GetDC (NULL);
if (!hdc)
{
WIN32_GDI_FAILED ("GetDC");
return NULL;
}
hBitmap = CreateDIBSection (hdc, (BITMAPINFO *)&bmi, DIB_RGB_COLORS,
(PVOID *) outdata, NULL, (DWORD)0);
if (hBitmap == NULL)
WIN32_GDI_FAILED ("CreateDIBSection");
ReleaseDC (NULL, hdc);
return hBitmap;
}
static gboolean
pixbuf_to_hbitmaps_alpha_winxp (GdkPixbuf *pixbuf,
HBITMAP *color,
HBITMAP *mask)
{
/* Based on code from
* http://www.dotnet247.com/247reference/msgs/13/66301.aspx
*/
HBITMAP hColorBitmap, hMaskBitmap;
guchar *indata, *inrow;
guchar *colordata, *colorrow, *maskdata, *maskbyte;
gint width, height, size, i, i_offset, j, j_offset, rowstride;
guint maskstride, mask_bit;
width = gdk_pixbuf_get_width (pixbuf); /* width of icon */
height = gdk_pixbuf_get_height (pixbuf); /* height of icon */
/* The bitmaps are created square */
size = MAX (width, height);
hColorBitmap = create_alpha_bitmap (size, &colordata);
if (!hColorBitmap)
return FALSE;
hMaskBitmap = create_color_bitmap (size, &maskdata, 1);
if (!hMaskBitmap)
{
DeleteObject (hColorBitmap);
return FALSE;
}
/* MSDN says mask rows are aligned to "LONG" boundaries */
maskstride = (((size + 31) & ~31) >> 3);
indata = gdk_pixbuf_get_pixels (pixbuf);
rowstride = gdk_pixbuf_get_rowstride (pixbuf);
if (width > height)
{
i_offset = 0;
j_offset = (width - height) / 2;
}
else
{
i_offset = (height - width) / 2;
j_offset = 0;
}
for (j = 0; j < height; j++)
{
colorrow = colordata + 4*(j+j_offset)*size + 4*i_offset;
maskbyte = maskdata + (j+j_offset)*maskstride + i_offset/8;
mask_bit = (0x80 >> (i_offset % 8));
inrow = indata + (height-j-1)*rowstride;
for (i = 0; i < width; i++)
{
colorrow[4*i+0] = inrow[4*i+2];
colorrow[4*i+1] = inrow[4*i+1];
colorrow[4*i+2] = inrow[4*i+0];
colorrow[4*i+3] = inrow[4*i+3];
if (inrow[4*i+3] == 0)
maskbyte[0] |= mask_bit; /* turn ON bit */
else
maskbyte[0] &= ~mask_bit; /* turn OFF bit */
mask_bit >>= 1;
if (mask_bit == 0)
{
mask_bit = 0x80;
maskbyte++;
}
}
}
*color = hColorBitmap;
*mask = hMaskBitmap;
return TRUE;
}
static gboolean
pixbuf_to_hbitmaps_normal (GdkPixbuf *pixbuf,
HBITMAP *color,
HBITMAP *mask)
{
/* Based on code from
* http://www.dotnet247.com/247reference/msgs/13/66301.aspx
*/
HBITMAP hColorBitmap, hMaskBitmap;
guchar *indata, *inrow;
guchar *colordata, *colorrow, *maskdata, *maskbyte;
gint width, height, size, i, i_offset, j, j_offset, rowstride, nc, bmstride;
gboolean has_alpha;
guint maskstride, mask_bit;
width = gdk_pixbuf_get_width (pixbuf); /* width of icon */
height = gdk_pixbuf_get_height (pixbuf); /* height of icon */
/* The bitmaps are created square */
size = MAX (width, height);
hColorBitmap = create_color_bitmap (size, &colordata, 24);
if (!hColorBitmap)
return FALSE;
hMaskBitmap = create_color_bitmap (size, &maskdata, 1);
if (!hMaskBitmap)
{
DeleteObject (hColorBitmap);
return FALSE;
}
/* rows are always aligned on 4-byte boundarys */
bmstride = size * 3;
if (bmstride % 4 != 0)
bmstride += 4 - (bmstride % 4);
/* MSDN says mask rows are aligned to "LONG" boundaries */
maskstride = (((size + 31) & ~31) >> 3);
indata = gdk_pixbuf_get_pixels (pixbuf);
rowstride = gdk_pixbuf_get_rowstride (pixbuf);
nc = gdk_pixbuf_get_n_channels (pixbuf);
has_alpha = gdk_pixbuf_get_has_alpha (pixbuf);
if (width > height)
{
i_offset = 0;
j_offset = (width - height) / 2;
}
else
{
i_offset = (height - width) / 2;
j_offset = 0;
}
for (j = 0; j < height; j++)
{
colorrow = colordata + (j+j_offset)*bmstride + 3*i_offset;
maskbyte = maskdata + (j+j_offset)*maskstride + i_offset/8;
mask_bit = (0x80 >> (i_offset % 8));
inrow = indata + (height-j-1)*rowstride;
for (i = 0; i < width; i++)
{
if (has_alpha && inrow[nc*i+3] < 128)
{
colorrow[3*i+0] = colorrow[3*i+1] = colorrow[3*i+2] = 0;
maskbyte[0] |= mask_bit; /* turn ON bit */
}
else
{
colorrow[3*i+0] = inrow[nc*i+2];
colorrow[3*i+1] = inrow[nc*i+1];
colorrow[3*i+2] = inrow[nc*i+0];
maskbyte[0] &= ~mask_bit; /* turn OFF bit */
}
mask_bit >>= 1;
if (mask_bit == 0)
{
mask_bit = 0x80;
maskbyte++;
}
}
}
*color = hColorBitmap;
*mask = hMaskBitmap;
return TRUE;
}
static HICON
pixbuf_to_hicon (GdkPixbuf *pixbuf,
gboolean is_icon,
gint x,
gint y)
{
ICONINFO ii;
HICON icon;
gboolean success;
if (pixbuf == NULL)
return NULL;
if (gdk_pixbuf_get_has_alpha (pixbuf))
success = pixbuf_to_hbitmaps_alpha_winxp (pixbuf, &ii.hbmColor, &ii.hbmMask);
else
success = pixbuf_to_hbitmaps_normal (pixbuf, &ii.hbmColor, &ii.hbmMask);
if (!success)
return NULL;
ii.fIcon = is_icon;
ii.xHotspot = x;
ii.yHotspot = y;
icon = CreateIconIndirect (&ii);
DeleteObject (ii.hbmColor);
DeleteObject (ii.hbmMask);
return icon;
}
HICON
_gdk_win32_texture_to_hicon (GdkTexture *texture)
{
cairo_surface_t *surface;
GdkPixbuf *pixbuf;
gint width, height;
HICON icon;
surface = gdk_texture_download_surface (texture);
width = cairo_image_surface_get_width (surface);
height = cairo_image_surface_get_height (surface);
pixbuf = gdk_pixbuf_get_from_surface (surface, 0, 0, width, height);
icon = pixbuf_to_hicon (pixbuf, TRUE, 0, 0);
g_object_unref (pixbuf);
return icon;
}
HICON
_gdk_win32_pixbuf_to_hcursor (GdkPixbuf *pixbuf,
gint x_hotspot,
gint y_hotspot)
{
return pixbuf_to_hicon (pixbuf, FALSE, x_hotspot, y_hotspot);
}
/**
* gdk_win32_display_get_hcursor:
* @display: (type GdkWin32Display): a #GdkDisplay
* @cursor: a #GdkCursor.
*
* Returns the Win32 HCURSOR belonging to a #GdkCursor, potentially
* creating the cursor.
*
* Be aware that the returned cursor may not be unique to @cursor.
* It may for example be shared with its fallback cursor.
*
* Returns: a Win32 HCURSOR.
**/
HCURSOR
gdk_win32_display_get_hcursor (GdkDisplay *display,
GdkCursor *cursor)
{
GdkWin32Display *win32_display = GDK_WIN32_DISPLAY (display);
HCURSOR hcursor;
g_return_val_if_fail (cursor != NULL, NULL);
if (gdk_display_is_closed (display))
return NULL;
hcursor = g_hash_table_lookup (win32_display->cursors, cursor);
if (hcursor != NULL)
return hcursor;
if (gdk_cursor_get_name (cursor))
hcursor = gdk_win32_cursor_create_for_name (display, gdk_cursor_get_name (cursor));
else
hcursor = gdk_win32_cursor_create_for_texture (display,
gdk_cursor_get_texture (cursor),
gdk_cursor_get_hotspot_x (cursor),
gdk_cursor_get_hotspot_y (cursor));
if (hcursor != NULL)
{
g_object_weak_ref (G_OBJECT (cursor), gdk_win32_cursor_remove_from_cache, display);
g_hash_table_insert (win32_display->cursors, cursor, hcursor);
return hcursor;
}
if (gdk_cursor_get_fallback (cursor))
return gdk_win32_display_get_hcursor (display, gdk_cursor_get_fallback (cursor));
return NULL;
}
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