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/*

 *  R : A Computer Language for Statistical Data Analysis

 *  Copyright (C) 2007-2016  The R Core Team

 *

 *  This program is free software; you can redistribute it and/or modify

 *  it under the terms of the GNU General Public License as published by

 *  the Free Software Foundation; either version 2 of the License, or

 *  (at your option) any later version.

 *

 *  This program 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 General Public License for more details.

 *

 *  You should have received a copy of the GNU General Public License

 *  along with this program; if not, a copy is available at

 *  https://www.R-project.org/Licenses/

 *

 *---------------------------------------------------------------------

 *  This header file constitutes the (unofficial) API to the Quartz

 *  device. Being unofficial, the API may change at any point without

 *  warning.

 *

 *  Quartz is a general device-independent way of drawing in macOS,

 *  therefore the Quartz device modularizes the actual drawing target

 *  implementation into separate modules (e.g. Carbon and Cocoa for

 *  on-screen display and PDF, Bitmap for off-screen drawing). The API

 *  below is used by the modules to talk to the Quartz device without

 *  having to know anything about R graphics device API.

 *

 *  Key functions are listed here:

 *  QuartzDevice_Create - creates a Quartz device

 *  QuartzDevice_ResetContext - should be called after the target

 *    context has been created to initialize it.

 *  QuartzDevice_Kill - closes the Quartz device (e.g. on window close)

 *  QuartzDevice_SetScaledSize - resize device (does not include

 *    re-painting, it should be followed by a call to

 *    QuartzDevice_ReplayDisplayList)

 *  QuartzDevice_ReplayDisplayList - replays all plot commands

 *

 *  Key concepts

 *  - all Quartz modules are expected to provide a device context

 *    (CGContextRef) for drawing. A device can temporarily return NULL

 *    (e.g. if the context is not available immediately) and replay

 *    the display list later to catch up.

 *

 *  - interactive devices can use QuartzDevice_SetScaledSize to resize

 *    the device (no context is necessary), then prepare the context

 *    (call QuartzDevice_ResetContext if a new context was created)

 *    and finally re-draw using QuartzDevice_ReplayDisplayList.

 *

 *  - snapshots can be created either off the current display list

 *    (last=0) or off the last known one (last=1). NewPage callback

 *    can only use last=1 as there is no display list during that

 *    call. Restored snapshots become the current display list and

 *    thus can be extended by further painting (yet the original saved

 *    copy is not influenced). Also note that all snapshots are SEXPs

 *    (the declaration doesn't use SEXP as to not depend on

 *    Rinternals.h) therefore must be protected or preserved immediately

 *    (i.e. the Quartz device does NOT protect them - except in the

 *    call to RestoreSnapshot).

 *

 *  - dirty flag: the dirty flag is not used internally by the Quartz

 *    device, but can be useful for the modules to determine whether

 *    the current graphics is a restored copy or in-progress

 *    drawing. The Quartz device manages the flag as follows: a)

 *    display list replay does NOT change the flag, b) snapshot

 *    restoration resets the flag, c) all other paint operations

 *    (i.e. outside of restore/replay) set the flag. Most common use

 *    is to determine whether restored snapshots have been

 *    subsequently modified.

 *

 *  - history: currently the history management is not used by any

 *    modules and as such is untested and strictly experimental. It

 *    may be removed in the future as it is not clear whether it makes

 *    sense to be part of the device. See Cocoa module for a

 *    module-internal implementation of the display history.

 *

 *  Quartz device creation path:

 *    quartz() function -> SEXP Quartz(args) ->

 *    setup QuartzParameters_t, call backend constructor

 *    [e.g. QuartzCocoa_DeviceCreate(dd, fn, QuartzParameters_t *pars)] ->

 *    create backend definition (QuartzBackend_t backend) -> 

 *    fn->Create(dd, &backend), return the result

 */

/* Unix-only header */

#ifndef R_EXT_QUARTZDEVICE_H_

#define R_EXT_QUARTZDEVICE_H_

/* FIXME: this is installed, but can it really work without config.h? */

#ifdef HAVE_CONFIG_H

#include <config.h>

#endif

#ifdef __cplusplus

extern "C" {

#endif   

#if HAVE_AQUA

#include <ApplicationServices/ApplicationServices.h>

#else

    typedef void* CGContextRef;

#endif

/* flags passed to the newPage callback */

#define QNPF_REDRAW 0x0001 /* is set when NewPage really means re-draw of an existing page */

/* flags passed to QuartzDevice_Create (as fs parameter) */

#define QDFLAG_DISPLAY_LIST 0x0001

#define QDFLAG_INTERACTIVE  0x0002 

#define QDFLAG_RASTERIZED   0x0004 /* rasterized media - may imply disabling AA paritally for rects etc. */

/* parameter flags (they should not conflict with QDFLAGS to allow chaining) */

#define QPFLAG_ANTIALIAS 0x0100

typedef void* QuartzDesc_t;

typedef struct QuartzBackend_s {

    int    size;                          /* structure size */

    double width, height;

    double scalex, scaley, pointsize;

    int    bg, canvas;

    int    flags;

    void*  userInfo;

    CGContextRef (*getCGContext)(QuartzDesc_t dev, void*userInfo); /* Get the context for this device */

    int          (*locatePoint)(QuartzDesc_t dev, void*userInfo, double*x, double*y);

    void         (*close)(QuartzDesc_t dev, void*userInfo);

    void         (*newPage)(QuartzDesc_t dev, void*userInfo, int flags);

    void         (*state)(QuartzDesc_t dev, void*userInfo, int state);

    void*        (*par)(QuartzDesc_t dev, void*userInfo, int set, const char *key, void *value);

    void         (*sync)(QuartzDesc_t dev, void*userInfo);

    void*        (*cap)(QuartzDesc_t dev, void*userInfo);

} QuartzBackend_t;

/* parameters that are passed to functions that create backends */

typedef struct QuartzParameters_s {

    int        size;                   /* structure size */

    const char *type, *file, *title;

    double     x, y, width, height, pointsize;

    const char *family;

    int        flags;

    int        connection;

    int        bg, canvas;

    double     *dpi;

    /* the following parameters can be used to pass custom parameters when desired */

    double     pard1, pard2;

    int        pari1, pari2;

    const char *pars1, *pars2;

    void       *parv;

} QuartzParameters_t;

/* all device implementations have to call this general Quartz device constructor at some point */

QuartzDesc_t QuartzDevice_Create(void *dd, QuartzBackend_t* def);

typedef struct QuartzFunctons_s {

    void*  (*Create)(void *, QuartzBackend_t *);  /* create a new device */

    int    (*DevNumber)(QuartzDesc_t desc);       /* returns device number */

    void   (*Kill)(QuartzDesc_t desc);            /* call to close the device */

    void   (*ResetContext)(QuartzDesc_t desc);    /* notifies Q back-end that the implementation has created a new context */

    double (*GetWidth)(QuartzDesc_t desc);        /* get device width (in inches) */

    double (*GetHeight)(QuartzDesc_t desc);       /* get device height (in inches) */

    void   (*SetSize)(QuartzDesc_t desc, double width, double height); /* set device size (in inches) */

    double (*GetScaledWidth)(QuartzDesc_t desc);  /* get device width (in pixels) */

    double (*GetScaledHeight)(QuartzDesc_t desc); /* get device height (in pixels) */

    void   (*SetScaledSize)(QuartzDesc_t desc, double width, double height); /* set device size (in pixels) */

    double (*GetXScale)(QuartzDesc_t desc);     /* get x scale factor (px/pt ratio) */

    double (*GetYScale)(QuartzDesc_t desc);     /* get y scale factor (px/pt ratio) */

    void   (*SetScale)(QuartzDesc_t desc,double scalex, double scaley); /* sets both scale factors (px/pt ratio) */

    void   (*SetTextScale)(QuartzDesc_t desc,double scale); /* sets text scale factor */

    double (*GetTextScale)(QuartzDesc_t desc);  /* sets text scale factor */

    void   (*SetPointSize)(QuartzDesc_t desc,double ps); /* sets point size */

    double (*GetPointSize)(QuartzDesc_t desc);  /* gets point size */

    int    (*GetDirty)(QuartzDesc_t desc);        /* sets dirty flag */

    void   (*SetDirty)(QuartzDesc_t desc,int dirty); /* gets dirty flag */

    void   (*ReplayDisplayList)(QuartzDesc_t desc); /* replay display list

     Note: it inhibits sync calls during repaint,

     the caller is responsible for calling sync if needed.

     Dirty flag is kept unmodified */

    void*  (*GetSnapshot)(QuartzDesc_t desc, int last);    

    /* create a (replayable) snapshot of the device contents. 

       when 'last' is set then the last stored display list is used, 

       otherwise a new snapshot is created */

    void   (*RestoreSnapshot)(QuartzDesc_t desc,void* snapshot);

    /* restore a snapshot. also clears the dirty flag */

    int    (*GetAntialias)(QuartzDesc_t desc);    /* get anti-alias flag */

    void   (*SetAntialias)(QuartzDesc_t desc, int aa); /* set anti-alias flag */

    int    (*GetBackground)(QuartzDesc_t desc);   /* get background color */

    void   (*Activate)(QuartzDesc_t desc);        /* activate/select the device */

    /* get/set Quartz-specific parameters. desc can be NULL for global parameters */

    void*  (*SetParameter)(QuartzDesc_t desc, const char *key, void *value);

    void*  (*GetParameter)(QuartzDesc_t desc, const char *key);

} QuartzFunctions_t;

#define QuartzParam_EmbeddingFlags "embeddeding flags" /* value: int[1] */

#define QP_Flags_CFLoop 0x0001  /* drives application event loop */

#define QP_Flags_Cocoa  0x0002  /* Cocoa is fully initialized */

#define QP_Flags_Front  0x0004  /* is front application */

/* FIXME: no longer used, remove in due course */

/* from unix/aqua.c - loads grDevices if necessary and returns NULL on failure */

QuartzFunctions_t *getQuartzFunctions();

/* type of a Quartz contructor */

typedef QuartzDesc_t (*quartz_create_fn_t)(void *dd, QuartzFunctions_t *fn, QuartzParameters_t *par);

/* grDevices currently supply following constructors:

   QuartzCocoa_DeviceCreate, QuartzCarbon_DeviceCreate,

   QuartzBitmap_DeviceCreate, QuartzPDF_DeviceCreate */

/* embedded Quartz support hook (defined in unix/aqua.c):

     dd = should be passed-through to QuartzDevice_Create

     fn = Quartz API functions

     par = parameters (see above) */

#ifndef IN_AQUA_C

    extern

#endif

    QuartzDesc_t (*ptr_QuartzBackend)(void *dd, QuartzFunctions_t *fn, QuartzParameters_t *par);

/* C version of the Quartz call (experimental)

   returns 0 on success, error code on failure */

QuartzDesc_t Quartz_C(QuartzParameters_t *par, quartz_create_fn_t q_create, int *errorCode);

#ifdef __cplusplus

}

#endif   

#endif