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gtk2/gdk/gdktypes.h
Alexander Larsson 038aac6275 gdk: Add support for OpenGL 
This adds the new type GdkGLContext that wraps an OpenGL context for a
particular native window. It also adds support for the gdk paint
machinery to use OpenGL to draw everything. As soon as anyone creates
a GL context for a native window we create a "paint context" for that
GdkWindow and switch to using GL for painting it.

This commit contains only an implementation for X11 (using GLX).

The way painting works is that all client gl contexts draw into
offscreen buffers rather than directly to the back buffer, and the
way something gets onto the window is by using gdk_cairo_draw_from_gl()
to draw part of that buffer onto the draw cairo context.

As a fallback (if we're doing redirected drawing or some effect like a
cairo_push_group()) we read back the gl buffer into memory and composite
using cairo. This means that GL rendering works in all cases, including
rendering to a PDF. However, this is not particularly fast.

In the *typical* case, where we're drawing directly to the window in
the regular paint loop we hit the fast path. The fast path uses opengl
to draw the buffer to the window back buffer, either by blitting or
texturing. Then we track the region that was drawn, and when the draw
ends we paint the normal cairo surface to the window (using
texture-from-pixmap in the X11 case, or texture from cairo image
otherwise) in the regions where there is no gl painted.

There are some complexities wrt layering of gl and cairo areas though:
* We track via gdk_window_mark_paint_from_clip() whenever gtk is
  painting over a region we previously rendered with opengl
  (flushed_region). This area (needs_blend_region) is blended
  rather than copied at the end of the frame.
* If we're drawing a gl texture with alpha we first copy the current
  cairo_surface inside the target region to the back buffer before
  we blend over it.

These two operations allow us full stacking of transparent gl and cairo
regions.
2014-10-13 10:43:31 -04:00

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/* GDK - The GIMP Drawing Kit
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* 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/>.
*/
/*
* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GTK+ Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
*/
#ifndef __GDK_TYPES_H__
#define __GDK_TYPES_H__
#if !defined (__GDK_H_INSIDE__) && !defined (GDK_COMPILATION)
#error "Only <gdk/gdk.h> can be included directly."
#endif
/* GDK uses "glib". (And so does GTK).
*/
#include <glib.h>
#include <pango/pango.h>
#include <glib-object.h>
#include <cairo.h>
/* The system specific file gdkconfig.h contains such configuration
* settings that are needed not only when compiling GDK (or GTK)
* itself, but also occasionally when compiling programs that use GDK
* (or GTK). One such setting is what windowing API backend is in use.
*/
#include <gdk/gdkconfig.h>
/* some common magic values */
/**
* GDK_CURRENT_TIME:
*
* Represents the current time, and can be used anywhere a time is expected.
*/
#define GDK_CURRENT_TIME 0L
/**
* GDK_PARENT_RELATIVE:
*
* A special value, indicating that the background
* for a window should be inherited from the parent window.
*/
#define GDK_PARENT_RELATIVE 1L
G_BEGIN_DECLS
/* Type definitions for the basic structures.
*/
typedef struct _GdkPoint GdkPoint;
/**
* GdkRectangle:
*
* Defines the position and size of a rectangle. It is identical to
* #cairo_rectangle_int_t.
*/
typedef cairo_rectangle_int_t GdkRectangle;
/**
* GdkAtom:
*
* An opaque type representing a string as an index into a table
* of strings on the X server.
*/
typedef struct _GdkAtom *GdkAtom;
/**
* GDK_ATOM_TO_POINTER:
* @atom: a #GdkAtom.
*
* Converts a #GdkAtom into a pointer type.
*/
#define GDK_ATOM_TO_POINTER(atom) (atom)
/**
* GDK_POINTER_TO_ATOM:
* @ptr: a pointer containing a #GdkAtom.
*
* Extracts a #GdkAtom from a pointer. The #GdkAtom must have been
* stored in the pointer with GDK_ATOM_TO_POINTER().
*/
#define GDK_POINTER_TO_ATOM(ptr) ((GdkAtom)(ptr))
#define _GDK_MAKE_ATOM(val) ((GdkAtom)GUINT_TO_POINTER(val))
/**
* GDK_NONE:
*
* A null value for #GdkAtom, used in a similar way as
* `None` in the Xlib API.
*/
#define GDK_NONE _GDK_MAKE_ATOM (0)
/* Forward declarations of commonly used types */
typedef struct _GdkColor GdkColor;
typedef struct _GdkRGBA GdkRGBA;
typedef struct _GdkCursor GdkCursor;
typedef struct _GdkVisual GdkVisual;
typedef struct _GdkDevice GdkDevice;
typedef struct _GdkDragContext GdkDragContext;
typedef struct _GdkDisplayManager GdkDisplayManager;
typedef struct _GdkDeviceManager GdkDeviceManager;
typedef struct _GdkDisplay GdkDisplay;
typedef struct _GdkScreen GdkScreen;
typedef struct _GdkWindow GdkWindow;
typedef struct _GdkKeymap GdkKeymap;
typedef struct _GdkAppLaunchContext GdkAppLaunchContext;
typedef struct _GdkGLContext GdkGLContext;
/**
* GdkByteOrder:
* @GDK_LSB_FIRST: The values are stored with the least-significant byte
* first. For instance, the 32-bit value 0xffeecc would be stored
* in memory as 0xcc, 0xee, 0xff, 0x00.
* @GDK_MSB_FIRST: The values are stored with the most-significant byte
* first. For instance, the 32-bit value 0xffeecc would be stored
* in memory as 0x00, 0xff, 0xee, 0xcc.
*
* A set of values describing the possible byte-orders
* for storing pixel values in memory.
*/
typedef enum
{
GDK_LSB_FIRST,
GDK_MSB_FIRST
} GdkByteOrder;
/* Types of modifiers.
*/
/**
* GdkModifierType:
* @GDK_SHIFT_MASK: the Shift key.
* @GDK_LOCK_MASK: a Lock key (depending on the modifier mapping of the
* X server this may either be CapsLock or ShiftLock).
* @GDK_CONTROL_MASK: the Control key.
* @GDK_MOD1_MASK: the fourth modifier key (it depends on the modifier
* mapping of the X server which key is interpreted as this modifier, but
* normally it is the Alt key).
* @GDK_MOD2_MASK: the fifth modifier key (it depends on the modifier
* mapping of the X server which key is interpreted as this modifier).
* @GDK_MOD3_MASK: the sixth modifier key (it depends on the modifier
* mapping of the X server which key is interpreted as this modifier).
* @GDK_MOD4_MASK: the seventh modifier key (it depends on the modifier
* mapping of the X server which key is interpreted as this modifier).
* @GDK_MOD5_MASK: the eighth modifier key (it depends on the modifier
* mapping of the X server which key is interpreted as this modifier).
* @GDK_BUTTON1_MASK: the first mouse button.
* @GDK_BUTTON2_MASK: the second mouse button.
* @GDK_BUTTON3_MASK: the third mouse button.
* @GDK_BUTTON4_MASK: the fourth mouse button.
* @GDK_BUTTON5_MASK: the fifth mouse button.
* @GDK_MODIFIER_RESERVED_13_MASK: A reserved bit flag; do not use in your own code
* @GDK_MODIFIER_RESERVED_14_MASK: A reserved bit flag; do not use in your own code
* @GDK_MODIFIER_RESERVED_15_MASK: A reserved bit flag; do not use in your own code
* @GDK_MODIFIER_RESERVED_16_MASK: A reserved bit flag; do not use in your own code
* @GDK_MODIFIER_RESERVED_17_MASK: A reserved bit flag; do not use in your own code
* @GDK_MODIFIER_RESERVED_18_MASK: A reserved bit flag; do not use in your own code
* @GDK_MODIFIER_RESERVED_19_MASK: A reserved bit flag; do not use in your own code
* @GDK_MODIFIER_RESERVED_20_MASK: A reserved bit flag; do not use in your own code
* @GDK_MODIFIER_RESERVED_21_MASK: A reserved bit flag; do not use in your own code
* @GDK_MODIFIER_RESERVED_22_MASK: A reserved bit flag; do not use in your own code
* @GDK_MODIFIER_RESERVED_23_MASK: A reserved bit flag; do not use in your own code
* @GDK_MODIFIER_RESERVED_24_MASK: A reserved bit flag; do not use in your own code
* @GDK_MODIFIER_RESERVED_25_MASK: A reserved bit flag; do not use in your own code
* @GDK_SUPER_MASK: the Super modifier. Since 2.10
* @GDK_HYPER_MASK: the Hyper modifier. Since 2.10
* @GDK_META_MASK: the Meta modifier. Since 2.10
* @GDK_MODIFIER_RESERVED_29_MASK: A reserved bit flag; do not use in your own code
* @GDK_RELEASE_MASK: not used in GDK itself. GTK+ uses it to differentiate
* between (keyval, modifiers) pairs from key press and release events.
* @GDK_MODIFIER_MASK: a mask covering all modifier types.
*
* A set of bit-flags to indicate the state of modifier keys and mouse buttons
* in various event types. Typical modifier keys are Shift, Control, Meta,
* Super, Hyper, Alt, Compose, Apple, CapsLock or ShiftLock.
*
* Like the X Window System, GDK supports 8 modifier keys and 5 mouse buttons.
*
* Since 2.10, GDK recognizes which of the Meta, Super or Hyper keys are mapped
* to Mod2 - Mod5, and indicates this by setting %GDK_SUPER_MASK,
* %GDK_HYPER_MASK or %GDK_META_MASK in the state field of key events.
*
* Note that GDK may add internal values to events which include
* reserved values such as %GDK_MODIFIER_RESERVED_13_MASK. Your code
* should preserve and ignore them. You can use %GDK_MODIFIER_MASK to
* remove all reserved values.
*/
typedef enum
{
GDK_SHIFT_MASK = 1 << 0,
GDK_LOCK_MASK = 1 << 1,
GDK_CONTROL_MASK = 1 << 2,
GDK_MOD1_MASK = 1 << 3,
GDK_MOD2_MASK = 1 << 4,
GDK_MOD3_MASK = 1 << 5,
GDK_MOD4_MASK = 1 << 6,
GDK_MOD5_MASK = 1 << 7,
GDK_BUTTON1_MASK = 1 << 8,
GDK_BUTTON2_MASK = 1 << 9,
GDK_BUTTON3_MASK = 1 << 10,
GDK_BUTTON4_MASK = 1 << 11,
GDK_BUTTON5_MASK = 1 << 12,
GDK_MODIFIER_RESERVED_13_MASK = 1 << 13,
GDK_MODIFIER_RESERVED_14_MASK = 1 << 14,
GDK_MODIFIER_RESERVED_15_MASK = 1 << 15,
GDK_MODIFIER_RESERVED_16_MASK = 1 << 16,
GDK_MODIFIER_RESERVED_17_MASK = 1 << 17,
GDK_MODIFIER_RESERVED_18_MASK = 1 << 18,
GDK_MODIFIER_RESERVED_19_MASK = 1 << 19,
GDK_MODIFIER_RESERVED_20_MASK = 1 << 20,
GDK_MODIFIER_RESERVED_21_MASK = 1 << 21,
GDK_MODIFIER_RESERVED_22_MASK = 1 << 22,
GDK_MODIFIER_RESERVED_23_MASK = 1 << 23,
GDK_MODIFIER_RESERVED_24_MASK = 1 << 24,
GDK_MODIFIER_RESERVED_25_MASK = 1 << 25,
/* The next few modifiers are used by XKB, so we skip to the end.
* Bits 15 - 25 are currently unused. Bit 29 is used internally.
*/
GDK_SUPER_MASK = 1 << 26,
GDK_HYPER_MASK = 1 << 27,
GDK_META_MASK = 1 << 28,
GDK_MODIFIER_RESERVED_29_MASK = 1 << 29,
GDK_RELEASE_MASK = 1 << 30,
/* Combination of GDK_SHIFT_MASK..GDK_BUTTON5_MASK + GDK_SUPER_MASK
+ GDK_HYPER_MASK + GDK_META_MASK + GDK_RELEASE_MASK */
GDK_MODIFIER_MASK = 0x5c001fff
} GdkModifierType;
/**
* GdkModifierIntent:
* @GDK_MODIFIER_INTENT_PRIMARY_ACCELERATOR: the primary modifier used to invoke
* menu accelerators.
* @GDK_MODIFIER_INTENT_CONTEXT_MENU: the modifier used to invoke context menus.
* Note that mouse button 3 always triggers context menus. When this modifier
* is not 0, it additionally triggers context menus when used with mouse button 1.
* @GDK_MODIFIER_INTENT_EXTEND_SELECTION: the modifier used to extend selections
* using `modifier`-click or `modifier`-cursor-key
* @GDK_MODIFIER_INTENT_MODIFY_SELECTION: the modifier used to modify selections,
* which in most cases means toggling the clicked item into or out of the selection.
* @GDK_MODIFIER_INTENT_NO_TEXT_INPUT: when any of these modifiers is pressed, the
* key event cannot produce a symbol directly. This is meant to be used for
* input methods, and for use cases like typeahead search.
* @GDK_MODIFIER_INTENT_SHIFT_GROUP: the modifier that switches between keyboard
* groups (AltGr on X11/Windows and Option/Alt on OS X).
*
* This enum is used with gdk_keymap_get_modifier_mask()
* in order to determine what modifiers the
* currently used windowing system backend uses for particular
* purposes. For example, on X11/Windows, the Control key is used for
* invoking menu shortcuts (accelerators), whereas on Apple computers
* it’s the Command key (which correspond to %GDK_CONTROL_MASK and
* %GDK_MOD2_MASK, respectively).
*
* Since: 3.4
**/
typedef enum
{
GDK_MODIFIER_INTENT_PRIMARY_ACCELERATOR,
GDK_MODIFIER_INTENT_CONTEXT_MENU,
GDK_MODIFIER_INTENT_EXTEND_SELECTION,
GDK_MODIFIER_INTENT_MODIFY_SELECTION,
GDK_MODIFIER_INTENT_NO_TEXT_INPUT,
GDK_MODIFIER_INTENT_SHIFT_GROUP
} GdkModifierIntent;
typedef enum
{
GDK_OK = 0,
GDK_ERROR = -1,
GDK_ERROR_PARAM = -2,
GDK_ERROR_FILE = -3,
GDK_ERROR_MEM = -4
} GdkStatus;
/**
* GdkGrabStatus:
* @GDK_GRAB_SUCCESS: the resource was successfully grabbed.
* @GDK_GRAB_ALREADY_GRABBED: the resource is actively grabbed by another client.
* @GDK_GRAB_INVALID_TIME: the resource was grabbed more recently than the
* specified time.
* @GDK_GRAB_NOT_VIEWABLE: the grab window or the @confine_to window are not
* viewable.
* @GDK_GRAB_FROZEN: the resource is frozen by an active grab of another client.
*
* Returned by gdk_device_grab(), gdk_pointer_grab() and gdk_keyboard_grab() to
* indicate success or the reason for the failure of the grab attempt.
*/
typedef enum
{
GDK_GRAB_SUCCESS = 0,
GDK_GRAB_ALREADY_GRABBED = 1,
GDK_GRAB_INVALID_TIME = 2,
GDK_GRAB_NOT_VIEWABLE = 3,
GDK_GRAB_FROZEN = 4
} GdkGrabStatus;
/**
* GdkGrabOwnership:
* @GDK_OWNERSHIP_NONE: All other devices’ events are allowed.
* @GDK_OWNERSHIP_WINDOW: Other devices’ events are blocked for the grab window.
* @GDK_OWNERSHIP_APPLICATION: Other devices’ events are blocked for the whole application.
*
* Defines how device grabs interact with other devices.
*/
typedef enum
{
GDK_OWNERSHIP_NONE,
GDK_OWNERSHIP_WINDOW,
GDK_OWNERSHIP_APPLICATION
} GdkGrabOwnership;
/**
* GdkEventMask:
* @GDK_EXPOSURE_MASK: receive expose events
* @GDK_POINTER_MOTION_MASK: receive all pointer motion events
* @GDK_POINTER_MOTION_HINT_MASK: deprecated. see the explanation above
* @GDK_BUTTON_MOTION_MASK: receive pointer motion events while any button is pressed
* @GDK_BUTTON1_MOTION_MASK: receive pointer motion events while 1 button is pressed
* @GDK_BUTTON2_MOTION_MASK: receive pointer motion events while 2 button is pressed
* @GDK_BUTTON3_MOTION_MASK: receive pointer motion events while 3 button is pressed
* @GDK_BUTTON_PRESS_MASK: receive button press events
* @GDK_BUTTON_RELEASE_MASK: receive button release events
* @GDK_KEY_PRESS_MASK: receive key press events
* @GDK_KEY_RELEASE_MASK: receive key release events
* @GDK_ENTER_NOTIFY_MASK: receive window enter events
* @GDK_LEAVE_NOTIFY_MASK: receive window leave events
* @GDK_FOCUS_CHANGE_MASK: receive focus change events
* @GDK_STRUCTURE_MASK: receive events about window configuration change
* @GDK_PROPERTY_CHANGE_MASK: receive property change events
* @GDK_VISIBILITY_NOTIFY_MASK: receive visibility change events
* @GDK_PROXIMITY_IN_MASK: receive proximity in events
* @GDK_PROXIMITY_OUT_MASK: receive proximity out events
* @GDK_SUBSTRUCTURE_MASK: receive events about window configuration changes of
* child windows
* @GDK_SCROLL_MASK: receive scroll events
* @GDK_TOUCH_MASK: receive touch events. Since 3.4
* @GDK_SMOOTH_SCROLL_MASK: receive smooth scrolling events. Since 3.4
* @GDK_ALL_EVENTS_MASK: the combination of all the above event masks.
*
* A set of bit-flags to indicate which events a window is to receive.
* Most of these masks map onto one or more of the #GdkEventType event types
* above.
*
* %GDK_POINTER_MOTION_HINT_MASK is deprecated. It is a special mask
* to reduce the number of %GDK_MOTION_NOTIFY events received. When using
* %GDK_POINTER_MOTION_HINT_MASK, fewer %GDK_MOTION_NOTIFY events will
* be sent, some of which are marked as a hint (the is_hint member is
* %TRUE). To receive more motion events after a motion hint event,
* the application needs to asks for more, by calling
* gdk_event_request_motions().
*
* Since GTK 3.8, motion events are already compressed by default, independent
* of this mechanism. This compression can be disabled with
* gdk_window_set_event_compression(). See the documentation of that function
* for details.
*
* If %GDK_TOUCH_MASK is enabled, the window will receive touch events
* from touch-enabled devices. Those will come as sequences of #GdkEventTouch
* with type %GDK_TOUCH_UPDATE, enclosed by two events with
* type %GDK_TOUCH_BEGIN and %GDK_TOUCH_END (or %GDK_TOUCH_CANCEL).
* gdk_event_get_event_sequence() returns the event sequence for these
* events, so different sequences may be distinguished.
*/
typedef enum
{
GDK_EXPOSURE_MASK = 1 << 1,
GDK_POINTER_MOTION_MASK = 1 << 2,
GDK_POINTER_MOTION_HINT_MASK = 1 << 3,
GDK_BUTTON_MOTION_MASK = 1 << 4,
GDK_BUTTON1_MOTION_MASK = 1 << 5,
GDK_BUTTON2_MOTION_MASK = 1 << 6,
GDK_BUTTON3_MOTION_MASK = 1 << 7,
GDK_BUTTON_PRESS_MASK = 1 << 8,
GDK_BUTTON_RELEASE_MASK = 1 << 9,
GDK_KEY_PRESS_MASK = 1 << 10,
GDK_KEY_RELEASE_MASK = 1 << 11,
GDK_ENTER_NOTIFY_MASK = 1 << 12,
GDK_LEAVE_NOTIFY_MASK = 1 << 13,
GDK_FOCUS_CHANGE_MASK = 1 << 14,
GDK_STRUCTURE_MASK = 1 << 15,
GDK_PROPERTY_CHANGE_MASK = 1 << 16,
GDK_VISIBILITY_NOTIFY_MASK = 1 << 17,
GDK_PROXIMITY_IN_MASK = 1 << 18,
GDK_PROXIMITY_OUT_MASK = 1 << 19,
GDK_SUBSTRUCTURE_MASK = 1 << 20,
GDK_SCROLL_MASK = 1 << 21,
GDK_TOUCH_MASK = 1 << 22,
GDK_SMOOTH_SCROLL_MASK = 1 << 23,
GDK_ALL_EVENTS_MASK = 0xFFFFFE
} GdkEventMask;
/**
* GdkPoint:
* @x: the x coordinate of the point.
* @y: the y coordinate of the point.
*
* Defines the x and y coordinates of a point.
*/
struct _GdkPoint
{
gint x;
gint y;
};
/**
* GdkGLProfile:
* @GDK_GL_PROFILE_DEFAULT: ...
* @GDK_GL_PROFILE_LEGACY: ...
* @GDK_GL_PROFILE_3_2_CORE: ...
*
* ...
*/
typedef enum {
GDK_GL_PROFILE_DEFAULT,
GDK_GL_PROFILE_LEGACY,
GDK_GL_PROFILE_3_2_CORE
} GdkGLProfile;
typedef enum {
GDK_GL_ERROR_NOT_AVAILABLE,
GDK_GL_ERROR_UNSUPPORTED_FORMAT,
GDK_GL_ERROR_UNSUPPORTED_PROFILE
} GdkGLError;
G_END_DECLS
#endif /* __GDK_TYPES_H__ */
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