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GdkDrawingContext

GdkDrawingContext — Drawing context for GDK windows

Properties

CairoRegion * clip Read / Write / Construct Only
GdkWindow * window Read / Write / Construct Only

Types and Values

Object Hierarchy

    GObject
    ╰── GdkDrawingContext

Includes

#include <gdk/gdk.h>

Description

GdkDrawingContext is an object that represents the current drawing state of a GdkWindow.

It's possible to use a GdkDrawingContext to draw on a GdkWindow via rendering API like Cairo or OpenGL.

A GdkDrawingContext can only be created by calling gdk_window_begin_draw_frame() and will be valid until a call to gdk_window_end_draw_frame().

GdkDrawingContext is available since GDK 3.22

Functions

gdk_drawing_context_get_window ()

GdkWindow *
gdk_drawing_context_get_window (GdkDrawingContext *context);

Retrieves the window that created the drawing context .

Parameters

context

a GdkDrawingContext

 

Returns

a GdkWindow.

[transfer none]

Since: 3.22


gdk_drawing_context_get_clip ()

cairo_region_t *
gdk_drawing_context_get_clip (GdkDrawingContext *context);

Retrieves a copy of the clip region used when creating the context .

Parameters

context

a GdkDrawingContext

 

Returns

a Cairo region.

[transfer full][nullable]

Since: 3.22


gdk_drawing_context_get_cairo_context ()

cairo_t *
gdk_drawing_context_get_cairo_context (GdkDrawingContext *context);

Retrieves a Cairo context to be used to draw on the GdkWindow that created the GdkDrawingContext.

The returned context is guaranteed to be valid as long as the GdkDrawingContext is valid, that is between a call to gdk_window_begin_draw_frame() and gdk_window_end_draw_frame().

Returns

a Cairo context to be used to draw the contents of the GdkWindow. The context is owned by the GdkDrawingContext and should not be destroyed.

[transfer none]

Since: 3.22


gdk_drawing_context_is_valid ()

gboolean
gdk_drawing_context_is_valid (GdkDrawingContext *context);

Checks whether the given GdkDrawingContext is valid.

Parameters

context

a GdkDrawingContext

 

Returns

TRUE if the context is valid

Since: 3.22

Types and Values

GdkDrawingContext

typedef struct _GdkDrawingContext GdkDrawingContext;

Property Details

The “clip” property

  “clip”                     CairoRegion *

The clip region applied to the drawing context.

Flags: Read / Write / Construct Only

Since: 3.22


The “window” property

  “window”                   GdkWindow *

The GdkWindow that created the drawing context.

Flags: Read / Write / Construct Only

Since: 3.22

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