gecko-dev/widget/gtk/gtkdrawing.h
Emilio Cobos Álvarez 57880152d6 Bug 1643474 - Cleanup and validate input in button layout placement code. r=stransky,smurfd
It is not clear whether this is the cause of the crash, but it seems
plausible as it is both recent code and it clearly doesn't validate the
length of the stack-allocated buffer, so a bad gconf could plausibly
cause this.

Clean stuff up a bit and validate the buffer length.

Differential Revision: https://phabricator.services.mozilla.com/D78405
2020-06-05 10:02:58 +00:00

633 lines
21 KiB
C++

/* -*- Mode: C; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/**
* gtkdrawing.h: GTK widget rendering utilities
*
* gtkdrawing provides an API for rendering GTK widgets in the
* current theme to a pixmap or window, without requiring an actual
* widget instantiation, similar to the Macintosh Appearance Manager
* or Windows XP's DrawThemeBackground() API.
*/
#ifndef _GTK_DRAWING_H_
#define _GTK_DRAWING_H_
#include <gdk/gdk.h>
#include <gtk/gtk.h>
#include <algorithm>
#include "mozilla/Span.h"
/*** type definitions ***/
typedef struct {
guint8 active;
guint8 focused;
guint8 selected;
guint8 inHover;
guint8 disabled;
guint8 isDefault;
guint8 canDefault;
/* The depressed state is for buttons which remain active for a longer period:
* activated toggle buttons or buttons showing a popup menu. */
guint8 depressed;
guint8 backdrop;
gint32 curpos; /* curpos and maxpos are used for scrollbars */
gint32 maxpos;
gint32 scale; /* actual widget scale */
} GtkWidgetState;
/**
* A size in the same GTK pixel units as GtkBorder and GdkRectangle.
*/
struct MozGtkSize {
gint width;
gint height;
MozGtkSize& operator+=(const GtkBorder& aBorder) {
width += aBorder.left + aBorder.right;
height += aBorder.top + aBorder.bottom;
return *this;
}
MozGtkSize operator+(const GtkBorder& aBorder) const {
MozGtkSize result = *this;
return result += aBorder;
}
bool operator<(const MozGtkSize& aOther) const {
return (width < aOther.width && height <= aOther.height) ||
(width <= aOther.width && height < aOther.height);
}
void Include(MozGtkSize aOther) {
width = std::max(width, aOther.width);
height = std::max(height, aOther.height);
}
void Rotate() {
gint tmp = width;
width = height;
height = tmp;
}
};
typedef struct {
bool initialized;
struct {
MozGtkSize scrollbar;
MozGtkSize thumb;
MozGtkSize button;
} size;
struct {
GtkBorder scrollbar;
GtkBorder track;
} border;
struct {
GtkBorder thumb;
} margin;
} ScrollbarGTKMetrics;
typedef struct {
bool initialized;
MozGtkSize minSizeWithBorder;
GtkBorder borderAndPadding;
} ToggleGTKMetrics;
typedef struct {
MozGtkSize minSizeWithBorderMargin;
GtkBorder buttonMargin;
gint iconXPosition;
gint iconYPosition;
bool visible;
bool firstButton;
bool lastButton;
} ToolbarButtonGTKMetrics;
#define TOOLBAR_BUTTONS 3
typedef struct {
bool initialized;
ToolbarButtonGTKMetrics button[TOOLBAR_BUTTONS];
} ToolbarGTKMetrics;
typedef struct {
bool initialized;
GtkBorder decorationSize;
} CSDWindowDecorationSize;
typedef enum {
MOZ_GTK_STEPPER_DOWN = 1 << 0,
MOZ_GTK_STEPPER_BOTTOM = 1 << 1,
MOZ_GTK_STEPPER_VERTICAL = 1 << 2
} GtkScrollbarButtonFlags;
typedef enum { MOZ_GTK_TRACK_OPAQUE = 1 << 0 } GtkScrollbarTrackFlags;
/** flags for tab state **/
typedef enum {
/* first eight bits are used to pass a margin */
MOZ_GTK_TAB_MARGIN_MASK = 0xFF,
/* the first tab in the group */
MOZ_GTK_TAB_FIRST = 1 << 9,
/* the selected tab */
MOZ_GTK_TAB_SELECTED = 1 << 10
} GtkTabFlags;
/*** result/error codes ***/
#define MOZ_GTK_SUCCESS 0
#define MOZ_GTK_UNKNOWN_WIDGET -1
#define MOZ_GTK_UNSAFE_THEME -2
/*** checkbox/radio flags ***/
#define MOZ_GTK_WIDGET_CHECKED 1
#define MOZ_GTK_WIDGET_INCONSISTENT (1 << 1)
/*** widget type constants ***/
typedef enum {
/* Paints a GtkButton. flags is a GtkReliefStyle. */
MOZ_GTK_BUTTON,
/* Paints a button with image and no text */
MOZ_GTK_TOOLBAR_BUTTON,
/* Paints a toggle button */
MOZ_GTK_TOGGLE_BUTTON,
/* Paints a button arrow */
MOZ_GTK_BUTTON_ARROW,
/* Paints the container part of a GtkCheckButton. */
MOZ_GTK_CHECKBUTTON_CONTAINER,
/* Paints a GtkCheckButton. flags is a boolean, 1=checked, 0=not checked. */
MOZ_GTK_CHECKBUTTON,
/* Paints the label of a GtkCheckButton (focus outline) */
MOZ_GTK_CHECKBUTTON_LABEL,
/* Paints the container part of a GtkRadioButton. */
MOZ_GTK_RADIOBUTTON_CONTAINER,
/* Paints a GtkRadioButton. flags is a boolean, 1=checked, 0=not checked. */
MOZ_GTK_RADIOBUTTON,
/* Paints the label of a GtkRadioButton (focus outline) */
MOZ_GTK_RADIOBUTTON_LABEL,
/**
* Paints the button of a GtkScrollbar. flags is a GtkArrowType giving
* the arrow direction.
*/
MOZ_GTK_SCROLLBAR_BUTTON,
/* Horizontal GtkScrollbar counterparts */
MOZ_GTK_SCROLLBAR_HORIZONTAL,
MOZ_GTK_SCROLLBAR_CONTENTS_HORIZONTAL,
/* Paints the trough (track) of a GtkScrollbar. */
MOZ_GTK_SCROLLBAR_TROUGH_HORIZONTAL,
/* Paints the slider (thumb) of a GtkScrollbar. */
MOZ_GTK_SCROLLBAR_THUMB_HORIZONTAL,
/* Vertical GtkScrollbar counterparts */
MOZ_GTK_SCROLLBAR_VERTICAL,
MOZ_GTK_SCROLLBAR_CONTENTS_VERTICAL,
MOZ_GTK_SCROLLBAR_TROUGH_VERTICAL,
MOZ_GTK_SCROLLBAR_THUMB_VERTICAL,
/* Paints a GtkScale. */
MOZ_GTK_SCALE_HORIZONTAL,
MOZ_GTK_SCALE_VERTICAL,
/* Paints a GtkScale trough. */
MOZ_GTK_SCALE_CONTENTS_HORIZONTAL,
MOZ_GTK_SCALE_CONTENTS_VERTICAL,
MOZ_GTK_SCALE_TROUGH_HORIZONTAL,
MOZ_GTK_SCALE_TROUGH_VERTICAL,
/* Paints a GtkScale thumb. */
MOZ_GTK_SCALE_THUMB_HORIZONTAL,
MOZ_GTK_SCALE_THUMB_VERTICAL,
/* Paints a GtkSpinButton */
MOZ_GTK_INNER_SPIN_BUTTON,
MOZ_GTK_SPINBUTTON,
MOZ_GTK_SPINBUTTON_UP,
MOZ_GTK_SPINBUTTON_DOWN,
MOZ_GTK_SPINBUTTON_ENTRY,
/* Paints the gripper of a GtkHandleBox. */
MOZ_GTK_GRIPPER,
/* Paints a GtkEntry. */
MOZ_GTK_ENTRY,
/* Paints a GtkExpander. */
MOZ_GTK_EXPANDER,
/* Paints a GtkTextView or gets the style context corresponding to the
root node of a GtkTextView. */
MOZ_GTK_TEXT_VIEW,
/* The "text" window or node of a GtkTextView */
MOZ_GTK_TEXT_VIEW_TEXT,
/* Paints a GtkOptionMenu. */
MOZ_GTK_DROPDOWN,
/* Paints a dropdown arrow (a GtkButton containing a down GtkArrow). */
MOZ_GTK_DROPDOWN_ARROW,
/* Paints an entry in an editable option menu */
MOZ_GTK_DROPDOWN_ENTRY,
/* Paints the background of a GtkHandleBox. */
MOZ_GTK_TOOLBAR,
/* Paints a toolbar separator */
MOZ_GTK_TOOLBAR_SEPARATOR,
/* Paints a GtkToolTip */
MOZ_GTK_TOOLTIP,
/* Paints a GtkBox from GtkToolTip */
MOZ_GTK_TOOLTIP_BOX,
/* Paints a GtkLabel of GtkToolTip */
MOZ_GTK_TOOLTIP_BOX_LABEL,
/* Paints a GtkFrame (e.g. a status bar panel). */
MOZ_GTK_FRAME,
/* Paints the border of a GtkFrame */
MOZ_GTK_FRAME_BORDER,
/* Paints a resize grip for a GtkTextView */
MOZ_GTK_RESIZER,
/* Paints a GtkProgressBar. */
MOZ_GTK_PROGRESSBAR,
/* Paints a trough (track) of a GtkProgressBar */
MOZ_GTK_PROGRESS_TROUGH,
/* Paints a progress chunk of a GtkProgressBar. */
MOZ_GTK_PROGRESS_CHUNK,
/* Paints a progress chunk of an indeterminated GtkProgressBar. */
MOZ_GTK_PROGRESS_CHUNK_INDETERMINATE,
/* Paints a progress chunk of a vertical indeterminated GtkProgressBar. */
MOZ_GTK_PROGRESS_CHUNK_VERTICAL_INDETERMINATE,
/* Used as root style of whole GtkNotebook widget */
MOZ_GTK_NOTEBOOK,
/* Used as root style of active GtkNotebook area which contains tabs and
arrows. */
MOZ_GTK_NOTEBOOK_HEADER,
/* Paints a tab of a GtkNotebook. flags is a GtkTabFlags, defined above. */
MOZ_GTK_TAB_TOP,
/* Paints a tab of a GtkNotebook. flags is a GtkTabFlags, defined above. */
MOZ_GTK_TAB_BOTTOM,
/* Paints the background and border of a GtkNotebook. */
MOZ_GTK_TABPANELS,
/* Paints a GtkArrow for a GtkNotebook. flags is a GtkArrowType. */
MOZ_GTK_TAB_SCROLLARROW,
/* Paints the expander and border of a GtkTreeView */
MOZ_GTK_TREEVIEW,
/* Paints the border of a GtkTreeView */
MOZ_GTK_TREEVIEW_VIEW,
/* Paints treeheader cells */
MOZ_GTK_TREE_HEADER_CELL,
/* Paints sort arrows in treeheader cells */
MOZ_GTK_TREE_HEADER_SORTARROW,
/* Paints an expander for a GtkTreeView */
MOZ_GTK_TREEVIEW_EXPANDER,
/* Paints the background of the menu bar. */
MOZ_GTK_MENUBAR,
/* Paints the background of menus, context menus. */
MOZ_GTK_MENUPOPUP,
/* Paints the arrow of menuitems that contain submenus */
MOZ_GTK_MENUARROW,
/* Paints an arrow in a toolbar button. flags is a GtkArrowType. */
MOZ_GTK_TOOLBARBUTTON_ARROW,
/* Paints items of menubar. */
MOZ_GTK_MENUBARITEM,
/* Paints items of popup menus. */
MOZ_GTK_MENUITEM,
/* Paints a menuitem with check indicator, or the gets the style context for
a menuitem that contains a checkbox. */
MOZ_GTK_CHECKMENUITEM,
/* Gets the style context for a checkbox in a check menuitem. */
MOZ_GTK_CHECKMENUITEM_INDICATOR,
MOZ_GTK_RADIOMENUITEM,
MOZ_GTK_RADIOMENUITEM_INDICATOR,
MOZ_GTK_MENUSEPARATOR,
/* GtkVPaned base class */
MOZ_GTK_SPLITTER_HORIZONTAL,
/* GtkHPaned base class */
MOZ_GTK_SPLITTER_VERTICAL,
/* Paints a GtkVPaned separator */
MOZ_GTK_SPLITTER_SEPARATOR_HORIZONTAL,
/* Paints a GtkHPaned separator */
MOZ_GTK_SPLITTER_SEPARATOR_VERTICAL,
/* Paints the background of a window, dialog or page. */
MOZ_GTK_WINDOW,
/* Used only as a container for MOZ_GTK_HEADER_BAR. */
MOZ_GTK_HEADERBAR_WINDOW,
/* Used only as a container for MOZ_GTK_HEADER_BAR_MAXIMIZED. */
MOZ_GTK_HEADERBAR_WINDOW_MAXIMIZED,
/* Window container for all widgets */
MOZ_GTK_WINDOW_CONTAINER,
/* Paints a GtkInfoBar, for notifications. */
MOZ_GTK_INFO_BAR,
/* Used for widget tree construction. */
MOZ_GTK_COMBOBOX,
/* Paints a GtkComboBox button widget. */
MOZ_GTK_COMBOBOX_BUTTON,
/* Paints a GtkComboBox arrow widget. */
MOZ_GTK_COMBOBOX_ARROW,
/* Paints a GtkComboBox separator widget. */
MOZ_GTK_COMBOBOX_SEPARATOR,
/* Used for widget tree construction. */
MOZ_GTK_COMBOBOX_ENTRY,
/* Paints a GtkComboBox entry widget. */
MOZ_GTK_COMBOBOX_ENTRY_TEXTAREA,
/* Paints a GtkComboBox entry button widget. */
MOZ_GTK_COMBOBOX_ENTRY_BUTTON,
/* Paints a GtkComboBox entry arrow widget. */
MOZ_GTK_COMBOBOX_ENTRY_ARROW,
/* Used for scrolled window shell. */
MOZ_GTK_SCROLLED_WINDOW,
/* Paints a GtkHeaderBar */
MOZ_GTK_HEADER_BAR,
/* Paints a GtkHeaderBar in maximized state */
MOZ_GTK_HEADER_BAR_MAXIMIZED,
/* Container for GtkHeaderBar buttons */
MOZ_GTK_HEADER_BAR_BUTTON_BOX,
/* Paints GtkHeaderBar title buttons.
* Keep the order here as MOZ_GTK_HEADER_BAR_BUTTON_* are processed
* as an array from MOZ_GTK_HEADER_BAR_BUTTON_CLOSE to the last one.
*/
MOZ_GTK_HEADER_BAR_BUTTON_CLOSE,
MOZ_GTK_HEADER_BAR_BUTTON_MINIMIZE,
MOZ_GTK_HEADER_BAR_BUTTON_MAXIMIZE,
/* MOZ_GTK_HEADER_BAR_BUTTON_MAXIMIZE_RESTORE is a state of
* MOZ_GTK_HEADER_BAR_BUTTON_MAXIMIZE button and it's used as
* an icon placeholder only.
*/
MOZ_GTK_HEADER_BAR_BUTTON_MAXIMIZE_RESTORE,
/* Client-side window decoration node. Available on GTK 3.20+. */
MOZ_GTK_WINDOW_DECORATION,
MOZ_GTK_WINDOW_DECORATION_SOLID,
MOZ_GTK_WIDGET_NODE_COUNT
} WidgetNodeType;
/* ButtonLayout represents a GTK CSD button and whether its on the left or
* right side of the tab bar */
struct ButtonLayout {
WidgetNodeType mType;
bool mAtRight;
};
/*** General library functions ***/
/**
* Initializes the drawing library. You must call this function
* prior to using any other functionality.
* returns: MOZ_GTK_SUCCESS if there were no errors
* MOZ_GTK_UNSAFE_THEME if the current theme engine is known
* to crash with gtkdrawing.
*/
gint moz_gtk_init();
/**
* Updates the drawing library when the theme changes.
*/
void moz_gtk_refresh();
/**
* Perform cleanup of the drawing library. You should call this function
* when your program exits, or you no longer need the library.
*
* returns: MOZ_GTK_SUCCESS if there was no error, an error code otherwise
*/
gint moz_gtk_shutdown();
/*** Widget drawing ***/
/**
* Paint a widget in the current theme.
* widget: a constant giving the widget to paint
* drawable: the drawable to paint to;
* it's colormap must be moz_gtk_widget_get_colormap().
* rect: the bounding rectangle for the widget
* state: the state of the widget. ignored for some widgets.
* flags: widget-dependant flags; see the WidgetNodeType definition.
* direction: the text direction, to draw the widget correctly LTR and RTL.
*/
gint moz_gtk_widget_paint(WidgetNodeType widget, cairo_t* cr,
GdkRectangle* rect, GtkWidgetState* state, gint flags,
GtkTextDirection direction);
/*** Widget metrics ***/
/**
* Get the border size of a widget
* left/right: [OUT] the widget's left/right border
* top/bottom: [OUT] the widget's top/bottom border
* direction: the text direction for the widget. Callers depend on this
* being used only for MOZ_GTK_DROPDOWN widgets, and cache
* results for other widget types across direction values.
*
* returns: MOZ_GTK_SUCCESS if there was no error, an error code otherwise
*/
gint moz_gtk_get_widget_border(WidgetNodeType widget, gint* left, gint* top,
gint* right, gint* bottom,
GtkTextDirection direction);
/**
* Get the border size of a notebook tab
* left/right: [OUT] the tab's left/right border
* top/bottom: [OUT] the tab's top/bottom border
* direction: the text direction for the widget
* flags: tab-dependant flags; see the GtkTabFlags definition.
* widget: tab widget
*
* returns: MOZ_GTK_SUCCESS if there was no error, an error code otherwise
*/
gint moz_gtk_get_tab_border(gint* left, gint* top, gint* right, gint* bottom,
GtkTextDirection direction, GtkTabFlags flags,
WidgetNodeType widget);
/**
* Get the desired size of a GtkCheckButton
* indicator_size: [OUT] the indicator size
* indicator_spacing: [OUT] the spacing between the indicator and its
* container
*
* returns: MOZ_GTK_SUCCESS if there was no error, an error code otherwise
*/
gint moz_gtk_checkbox_get_metrics(gint* indicator_size,
gint* indicator_spacing);
/**
* Get metrics of the toggle (radio or checkbox)
* isRadio: [IN] true when requesting metrics for the radio button
* returns: pointer to ToggleGTKMetrics struct
*/
const ToggleGTKMetrics* GetToggleMetrics(WidgetNodeType aWidgetType);
/**
* Get the desired size of a GtkRadioButton
* indicator_size: [OUT] the indicator size
* indicator_spacing: [OUT] the spacing between the indicator and its
* container
*
* returns: MOZ_GTK_SUCCESS if there was no error, an error code otherwise
*/
gint moz_gtk_radio_get_metrics(gint* indicator_size, gint* indicator_spacing);
/** Returns the size of the focus ring for outline:auto.
* focus_h_width: [OUT] the horizontal width
* focus_v_width: [OUT] the vertical width
*
* returns: MOZ_GTK_SUCCESS
*/
gint moz_gtk_get_focus_outline_size(gint* focus_h_width, gint* focus_v_width);
/** Get the horizontal padding for the menuitem widget or checkmenuitem widget.
* horizontal_padding: [OUT] The left and right padding of the menuitem or
* checkmenuitem
*
* returns: MOZ_GTK_SUCCESS if there was no error, an error code otherwise
*/
gint moz_gtk_menuitem_get_horizontal_padding(gint* horizontal_padding);
gint moz_gtk_checkmenuitem_get_horizontal_padding(gint* horizontal_padding);
/**
* Some GTK themes draw their indication for the default button outside
* the button (e.g. the glow in New Wave). This gets the extra space necessary.
*
* border_top: [OUT] extra space to add above
* border_left: [OUT] extra space to add to the left
* border_bottom: [OUT] extra space to add underneath
* border_right: [OUT] extra space to add to the right
*
* returns: MOZ_GTK_SUCCESS if there was no error, an error code otherwise
*/
gint moz_gtk_button_get_default_overflow(gint* border_top, gint* border_left,
gint* border_bottom,
gint* border_right);
/**
* Gets the minimum size of a GtkScale.
* orient: [IN] the scale orientation
* scale_width: [OUT] the width of the scale
* scale_height: [OUT] the height of the scale
*/
void moz_gtk_get_scale_metrics(GtkOrientation orient, gint* scale_width,
gint* scale_height);
/**
* Get the desired size of a GtkScale thumb
* orient: [IN] the scale orientation
* thumb_length: [OUT] the length of the thumb
* thumb_height: [OUT] the height of the thumb
*
* returns: MOZ_GTK_SUCCESS if there was no error, an error code otherwise
*/
gint moz_gtk_get_scalethumb_metrics(GtkOrientation orient, gint* thumb_length,
gint* thumb_height);
/**
* Get the metrics in GTK pixels for a scrollbar.
* aOrientation: [IN] the scrollbar orientation
*/
const ScrollbarGTKMetrics* GetScrollbarMetrics(GtkOrientation aOrientation);
/**
* Get the metrics in GTK pixels for a scrollbar which is active
* (selected by mouse pointer).
* aOrientation: [IN] the scrollbar orientation
*/
const ScrollbarGTKMetrics* GetActiveScrollbarMetrics(
GtkOrientation aOrientation);
/**
* Get the desired size of a dropdown arrow button
* width: [OUT] the desired width
* height: [OUT] the desired height
*
* returns: MOZ_GTK_SUCCESS if there was no error, an error code otherwise
*/
gint moz_gtk_get_combo_box_entry_button_size(gint* width, gint* height);
/**
* Get the desired size of a scroll arrow widget
* width: [OUT] the desired width
* height: [OUT] the desired height
*
* returns: MOZ_GTK_SUCCESS if there was no error, an error code otherwise
*/
gint moz_gtk_get_tab_scroll_arrow_size(gint* width, gint* height);
/**
* Get the desired size of an arrow in a button
*
* widgetType: [IN] the widget for which to get the arrow size
* width: [OUT] the desired width
* height: [OUT] the desired height
*/
void moz_gtk_get_arrow_size(WidgetNodeType widgetType, gint* width,
gint* height);
/**
* Get the minimum height of a entry widget
* min_content_height: [OUT] the minimum height of the content box.
* border_padding_height: [OUT] the size of borders and paddings.
*/
void moz_gtk_get_entry_min_height(gint* min_content_height,
gint* border_padding_height);
/**
* Get the desired size of a toolbar separator
* size: [OUT] the desired width
*
* returns: MOZ_GTK_SUCCESS if there was no error, an error code otherwise
*/
gint moz_gtk_get_toolbar_separator_width(gint* size);
/**
* Get the size of a regular GTK expander that shows/hides content
* size: [OUT] the size of the GTK expander, size = width = height.
*
* returns: MOZ_GTK_SUCCESS if there was no error, an error code otherwise
*/
gint moz_gtk_get_expander_size(gint* size);
/**
* Get the size of a treeview's expander (we call them twisties)
* size: [OUT] the size of the GTK expander, size = width = height.
*
* returns: MOZ_GTK_SUCCESS if there was no error, an error code otherwise
*/
gint moz_gtk_get_treeview_expander_size(gint* size);
/**
* Get the desired height of a menu separator
* size: [OUT] the desired height
*
* returns: MOZ_GTK_SUCCESS if there was no error, an error code otherwise
*/
gint moz_gtk_get_menu_separator_height(gint* size);
/**
* Get the desired size of a splitter
* orientation: [IN] GTK_ORIENTATION_HORIZONTAL or GTK_ORIENTATION_VERTICAL
* size: [OUT] width or height of the splitter handle
*
* returns: MOZ_GTK_SUCCESS if there was no error, an error code otherwise
*/
gint moz_gtk_splitter_get_metrics(gint orientation, gint* size);
/**
* Get the YTHICKNESS of a tab (notebook extension).
*/
gint moz_gtk_get_tab_thickness(WidgetNodeType aNodeType);
/**
* Get ToolbarButtonGTKMetrics for recent theme.
*/
const ToolbarButtonGTKMetrics* GetToolbarButtonMetrics(
WidgetNodeType aAppearance);
/**
* Get toolbar button layout.
* aButtonLayout: [OUT] An array which will be filled by ButtonLayout
* references to visible titlebar buttons. Must contain at
* least TOOLBAR_BUTTONS entries if non-empty.
* aReversedButtonsPlacement: [OUT] True if the buttons are placed in opposite
* titlebar corner.
*
* returns: Number of returned entries at aButtonLayout.
*/
size_t GetGtkHeaderBarButtonLayout(mozilla::Span<ButtonLayout>,
bool* aReversedButtonsPlacement);
/**
* Get size of CSD window extents.
*
* aIsPopup: [IN] Get decoration size for popup or toplevel window.
*
* returns: Calculated (or estimated) decoration size of given aGtkWindow.
*/
GtkBorder GetCSDDecorationSize(bool aIsPopup);
#endif