FLTK 1.4.4: platform_types.h File Reference

FLTK 1.4.4

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platform_types.h File Reference

Definitions of platform-dependent types. More...

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## Macros
#define | FL_COMMAND opaque
| An alias for FL_CTRL on Windows and X11, or FL_META on MacOS X.
#define | FL_CONTROL opaque
| An alias for FL_META on Windows and X11, or FL_CTRL on MacOS X.

## Typedefs
typedef opaque | fl_intptr_t
| An integral type large enough to store a pointer or a long value.
typedef opaque | Fl_Offscreen
| Platform-specific value representing an offscreen drawing buffer.
typedef struct opaque * | Fl_Region
| Pointer to a platform-specific structure representing a collection of rectangles.
typedef opaque | FL_SOCKET
| socket or file descriptor
typedef opaque | Fl_Timestamp
| Platform-specific point in time, used for delta time calculation.
typedef opaque | fl_uintptr_t
| An unsigned integral type large enough to store a pointer or an unsigned long value.
typedef struct opaque * | GLContext
| Pointer to a platform-specific structure representing the window's OpenGL rendering context.

## Detailed Description

Definitions of platform-dependent types.

The exact nature of these types varies with the platform. Therefore, portable FLTK applications should not assume these types have a specific size, or that they are pointers.

## Typedef Documentation

## ◆ fl_intptr_t

typedef opaque fl_intptr_t

An integral type large enough to store a pointer or a long value.

A pointer value can be safely cast to fl_intptr_t, and later cast back to its initial pointer type without change to the pointer value. A variable of type fl_intptr_t can also store a long int value.

## ◆ Fl_Offscreen

typedef opaque Fl_Offscreen

Platform-specific value representing an offscreen drawing buffer.

Note
  This value can be safely cast to these types on each platform:
  - X11: Pixmap
  - Wayland: cairo_t *
  - Windows: HBITMAP
  - macOS: CGContextRef

## ◆ Fl_Region

typedef struct opaque* Fl_Region

Pointer to a platform-specific structure representing a collection of rectangles.

Note
  This pointer can be safely cast to these types on each platform:
  - X11: Region as defined by X11
  - Wayland: cairo_region_t *
  - Windows: HRGN
  - macOS: struct flCocoaRegion *

## ◆ Fl_Timestamp

typedef opaque Fl_Timestamp

Platform-specific point in time, used for delta time calculation.

Note
  This type may be a struct. sizeof(Fl_Timestamp) may be different on different platforms. Fl_Timestamp may change with future ABI changes.

## ◆ fl_uintptr_t

typedef opaque fl_uintptr_t

An unsigned integral type large enough to store a pointer or an unsigned long value.

A pointer value can be safely cast to fl_uintptr_t, and later cast back to its initial pointer type without change to the pointer value. A variable of type fl_uintptr_t can also store an unsigned long int value.

## ◆ GLContext

typedef struct opaque* GLContext

Pointer to a platform-specific structure representing the window's OpenGL rendering context.

Note
  This pointer can be safely cast to these types on each platform:
  - X11: GLXContext
  - Wayland: EGLContext
  - Windows: HGLRC
  - macOS: NSOpenGLContext *