/* esdb.h 1.1 */
/*
    Copyright 1992, 1993 O'Reilly and Associates, Inc.  Permission to
    use, copy, and modify this program is hereby granted, as long as
    this copyright notice appears in each copy of the program source
    code.
*/

/* Escape to request double buffering. */
#define ES_ESCAPE_ET_DBLBUFFER		0x8401
#define ES_ESCAPE_DBLBUFFER		0x80040001

#define ES_RENDERER_SINGLEBUFFER	0
#define ES_RENDERER_DBLBUFFER		1

typedef struct {
    Drawable		drawable;
    unsigned long	bufferMode;
} esEscapeDblBuffer;


/* Escape to swap buffers. */
#define ES_ESCAPE_ET_SWAPBUFFER	0x8402
#define ES_ESCAPE_SWAPBUFFER	0x80040002

typedef struct {
    Drawable	drawable;
} esEscapeSwapBuffer;


/* Escape to inquire the update action at swap. */
#define ES_ESCAPE_ET_SWAPBUFFERCONTENT	0x8403
#define ES_ESCAPE_SWAPBUFFERCONTENT	0x80040003

#define ES_DB_SWAP_CONTENT_UNDEFINED		0
#define ES_DB_SWAP_CONTENT_CLEAR_TO_BACKGROUND	1
#define ES_DB_SWAP_CONTENT_UNCHANGED		2
#define ES_DB_SWAP_CONTENT_FRONTBUFFER		3

typedef struct {
    Drawable	drawable;
} esEscapeSwapBufferContent;

typedef struct {
    unsigned char	type;
    unsigned char	unused;
    unsigned short	sequenceNum;
    unsigned long	length;
    unsigned long	escapeId;
    unsigned long	content;
} esEscapeSwapBufferContentReply;


/* The HP "draw to front buffer" escape. */
#define HP_ESCAPE_ET_DFRONT		0x8701
#define HP_ESCAPE_DFRONT		0x80070001
#define HP_RENDER_TO_BACK_BUFFER	0
#define HP_RENDER_TO_FRONT_BUFFER	1

typedef struct {
    Drawable	drawable;
    int		render_to_front_buffer;
} hpEscapeSetRenderingBuffer;