#include "evas_common.h"
#include "evas_private.h"

#include "Evas_Engine_Software_X11.h"

#include "evas_engine.h"

#ifdef BUILD_ENGINE_SOFTWARE_XLIB
# include "evas_xlib_outbuf.h"
# include "evas_xlib_color.h"
#endif

#ifdef BUILD_ENGINE_SOFTWARE_XCB
# include "evas_xcb_outbuf.h"
# include "evas_xcb_color.h"
#endif

/* function tables - filled in later (func and parent func) */
static Evas_Func func, pfunc;

/* engine struct data */
typedef struct _Render_Engine Render_Engine;

struct _Render_Engine
{
   Tilebuf      *tb;
   Outbuf       *ob;
   Tilebuf_Rect *rects;
   Eina_Inlist  *cur_rect;
   int           end : 1;

   void        (*outbuf_free)(Outbuf *ob);
   void        (*outbuf_reconfigure)(Outbuf *ob, int w, int h, int rot, Outbuf_Depth depth);
   int         (*outbuf_get_rot)(Outbuf *ob);
   RGBA_Image *(*outbuf_new_region_for_update)(Outbuf *ob, int x, int y, int w, int h, int *cx, int *cy, int *cw, int *ch);
   void        (*outbuf_push_updated_region)(Outbuf *ob, RGBA_Image *update, int x, int y, int w, int h);
   void        (*outbuf_free_region_for_update)(Outbuf *ob, RGBA_Image *update);
   void        (*outbuf_flush)(Outbuf *ob);
   void        (*outbuf_idle_flush)(Outbuf *ob);
   Eina_Bool   (*outbuf_alpha_get)(Outbuf *ob);
};

/* prototypes we will use here */
static void        *_best_visual_get   (int backend, void *connection, int screen);
static unsigned int _best_colormap_get (int backend, void *connection, int screen);
static int          _best_depth_get    (int backend, void *connection, int screen);

static void *eng_info(Evas *e);
static void eng_info_free(Evas *e, void *info);
static int eng_setup(Evas *e, void *info);
static void eng_output_free(void *data);
static void eng_output_resize(void *data, int w, int h);
static void eng_output_tile_size_set(void *data, int w, int h);
static void eng_output_redraws_rect_add(void *data, int x, int y, int w, int h);
static void eng_output_redraws_rect_del(void *data, int x, int y, int w, int h);
static void eng_output_redraws_clear(void *data);
static void *eng_output_redraws_next_update_get(void *data, int *x, int *y, int *w, int *h, int *cx, int *cy, int *cw, int *ch);
static void eng_output_redraws_next_update_push(void *data, void *surface, int x, int y, int w, int h);
static void eng_output_flush(void *data);
static void eng_output_idle_flush(void *data);


/* internal engine routines */

#ifdef BUILD_ENGINE_SOFTWARE_XLIB
static void *
_output_xlib_setup(int      w,
                   int      h,
                   int      rot,
                   Display *disp,
                   Drawable draw,
                   Visual  *vis,
                   Colormap cmap,
                   int      depth,
                   int      debug,
                   int      grayscale,
                   int      max_colors,
                   Pixmap   mask,
                   int      shape_dither,
                   int      destination_alpha)
{
   Render_Engine *re;

   re = calloc(1, sizeof(Render_Engine));
   if (!re)
     return NULL;

   evas_software_xlib_x_init();
   evas_software_xlib_x_color_init();
   evas_software_xlib_outbuf_init();

   re->ob = evas_software_xlib_outbuf_setup_x(w,
                                              h,
                                              rot,
                                              OUTBUF_DEPTH_INHERIT,
                                              disp,
                                              draw,
                                              vis,
                                              cmap,
                                              depth,
                                              grayscale,
                                              max_colors,
                                              mask,
                                              shape_dither,
                                              destination_alpha);
   if (!re->ob)
     {
	free(re);
	return NULL;
     }

   /* for updates return 1 big buffer, but only use portions of it, also cache
    it and keepit around until an idle_flush */
   /* disable for now - i am hunting down why some expedite tests are slower,
    * as well as shaped stuff is broken and probable non-32bpp is broken as
    * convert funcs dont do the right thing
    *
   re->ob->onebuf = 1;
    */

   evas_software_xlib_outbuf_debug_set(re->ob, debug);
   re->tb = evas_common_tilebuf_new(w, h);
   if (!re->tb)
     {
	evas_software_xlib_outbuf_free(re->ob);
	free(re);
	return NULL;
     }
   /* in preliminary tests 16x16 gave highest framerates */
   evas_common_tilebuf_set_tile_size(re->tb, TILESIZE, TILESIZE);
   return re;
}
#endif

#ifdef BUILD_ENGINE_SOFTWARE_XCB
static void *
_output_xcb_setup(int               w,
                  int               h,
                  int               rot,
                  xcb_connection_t *conn,
                  xcb_screen_t     *screen,
                  xcb_drawable_t    draw,
                  xcb_visualtype_t *vis,
                  xcb_colormap_t    cmap,
                  int               depth,
                  int               debug,
                  int               grayscale,
                  int               max_colors,
                  xcb_drawable_t    mask,
                  int               shape_dither,
                  int               destination_alpha)
{
   Render_Engine *re;

   re = calloc(1, sizeof(Render_Engine));
   if (!re)
     return NULL;

   evas_software_xcb_x_init();
   evas_software_xcb_x_color_init();
   evas_software_xcb_outbuf_init();

   re->ob = evas_software_xcb_outbuf_setup_x(w,
                                             h,
                                             rot,
					     OUTBUF_DEPTH_INHERIT,
					     conn,
                                             screen,
					     draw,
					     vis,
					     cmap,
					     depth,
					     grayscale,
					     max_colors,
					     mask,
                                             shape_dither,
                                             destination_alpha);
   if (!re->ob)
     {
	free(re);
	return NULL;
     }

   /* for updates return 1 big buffer, but only use portions of it, also cache
    it and keepit around until an idle_flush */
   /* disable for now - i am hunting down why some expedite tests are slower,
    * as well as shaped stuff is broken and probable non-32bpp is broken as
    * convert funcs dont do the right thing
    *
   re->ob->onebuf = 1;
    */

   evas_software_xcb_outbuf_debug_set(re->ob, debug);
   re->tb = evas_common_tilebuf_new(w, h);
   if (!re->tb)
     {
	evas_software_xcb_outbuf_free(re->ob);
	free(re);
	return NULL;
     }
   /* in preliminary tests 16x16 gave highest framerates */
   evas_common_tilebuf_set_tile_size(re->tb, TILESIZE, TILESIZE);
   return re;
}
#endif

static void *
_best_visual_get(int backend, void *connection, int screen)
{
   if (!connection) return NULL;

#ifdef BUILD_ENGINE_SOFTWARE_XLIB
   if (backend == EVAS_ENGINE_INFO_SOFTWARE_X11_BACKEND_XLIB)
     {
        return DefaultVisual((Display *)connection, screen);
     }
#endif

#ifdef BUILD_ENGINE_SOFTWARE_XCB
   if (backend == EVAS_ENGINE_INFO_SOFTWARE_X11_BACKEND_XCB)
     {
        xcb_screen_iterator_t iter_screen;
        xcb_depth_iterator_t  iter_depth;
        xcb_screen_t          *s;

        iter_screen = xcb_setup_roots_iterator(xcb_get_setup((xcb_connection_t *)connection));
        for (; iter_screen.rem; --screen, xcb_screen_next (&iter_screen))
          if (screen == 0)
            {
               s = iter_screen.data;
               break;
            }

        iter_depth = xcb_screen_allowed_depths_iterator(s);
        for (; iter_depth.rem; xcb_depth_next (&iter_depth))
          {
             xcb_visualtype_iterator_t iter_vis;

             iter_vis = xcb_depth_visuals_iterator(iter_depth.data);
             for (; iter_vis.rem; xcb_visualtype_next (&iter_vis))
               {
                  if (s->root_visual == iter_vis.data->visual_id)
                    return iter_vis.data;
               }
          }
     }
#endif

   return NULL;
}

static unsigned int
_best_colormap_get(int backend, void *connection, int screen)
{
   if (!connection) return 0;

#ifdef BUILD_ENGINE_SOFTWARE_XLIB
   if (backend == EVAS_ENGINE_INFO_SOFTWARE_X11_BACKEND_XLIB)
     {
        return DefaultColormap((Display *)connection, screen);
     }
#endif

#ifdef BUILD_ENGINE_SOFTWARE_XCB
   if (backend == EVAS_ENGINE_INFO_SOFTWARE_X11_BACKEND_XCB)
     {
        xcb_screen_iterator_t iter_screen;
        xcb_screen_t          *s;

        iter_screen = xcb_setup_roots_iterator(xcb_get_setup((xcb_connection_t *)connection));
        for (; iter_screen.rem; --screen, xcb_screen_next (&iter_screen))
          if (screen == 0)
            {
               s = iter_screen.data;
               break;
            }

        return s->default_colormap;
     }
#endif

   return 0;
}

static int
_best_depth_get(int backend, void *connection, int screen)
{
   if (!connection) return 0;

#ifdef BUILD_ENGINE_SOFTWARE_XLIB
   if (backend == EVAS_ENGINE_INFO_SOFTWARE_X11_BACKEND_XLIB)
     {
        return DefaultDepth((Display *)connection, screen);
     }
#endif

#ifdef BUILD_ENGINE_SOFTWARE_XCB
   if (backend == EVAS_ENGINE_INFO_SOFTWARE_X11_BACKEND_XCB)
     {
        xcb_screen_iterator_t iter_screen;
        xcb_screen_t          *s;

        iter_screen = xcb_setup_roots_iterator(xcb_get_setup((xcb_connection_t *)connection));
        for (; iter_screen.rem; --screen, xcb_screen_next (&iter_screen))
          if (screen == 0)
            {
               s = iter_screen.data;
               break;
            }

        return s->root_depth;
     }
#endif

   return 0;
}

/* engine api this module provides */
static void *
eng_info(Evas *e __UNUSED__)
{
   Evas_Engine_Info_Software_X11 *info;

   info = calloc(1, sizeof(Evas_Engine_Info_Software_X11));
   if (!info) return NULL;
   info->magic.magic = rand();
   info->info.debug = 0;
   info->info.alloc_grayscale = 0;
   info->info.alloc_colors_max = 216;
   info->func.best_visual_get = _best_visual_get;
   info->func.best_colormap_get = _best_colormap_get;
   info->func.best_depth_get = _best_depth_get;
   return info;
}

static void
eng_info_free(Evas *e __UNUSED__, void *info)
{
   Evas_Engine_Info_Software_X11 *in;

   in = (Evas_Engine_Info_Software_X11 *)info;
   free(in);
}

static int
eng_setup(Evas *e, void *in)
{
   Render_Engine                 *re;
   Evas_Engine_Info_Software_X11 *info;

   info = (Evas_Engine_Info_Software_X11 *)in;
   if (!e->engine.data.output)
     {
        /* if we haven't initialized - init (automatic abort if already done) */
        evas_common_cpu_init();
        evas_common_blend_init();
        evas_common_image_init();
        evas_common_convert_init();
        evas_common_scale_init();
        evas_common_rectangle_init();
        evas_common_gradient_init();
        evas_common_polygon_init();
        evas_common_line_init();
        evas_common_font_init();
        evas_common_draw_init();
        evas_common_tilebuf_init();

#ifdef BUILD_ENGINE_SOFTWARE_XLIB
        if (info->info.backend == EVAS_ENGINE_INFO_SOFTWARE_X11_BACKEND_XLIB)
          {
             re = _output_xlib_setup(e->output.w,
                                     e->output.h,
                                     info->info.rotation,
                                     info->info.connection,
                                     info->info.drawable,
                                     info->info.visual,
                                     info->info.colormap,
                                     info->info.depth,
                                     info->info.debug,
                                     info->info.alloc_grayscale,
                                     info->info.alloc_colors_max,
                                     info->info.mask,
                                     info->info.shape_dither,
                                     info->info.destination_alpha);

             re->outbuf_free = evas_software_xlib_outbuf_free;
             re->outbuf_reconfigure = evas_software_xlib_outbuf_reconfigure;
             re->outbuf_get_rot = evas_software_xlib_outbuf_get_rot;
             re->outbuf_new_region_for_update = evas_software_xlib_outbuf_new_region_for_update;
             re->outbuf_push_updated_region = evas_software_xlib_outbuf_push_updated_region;
             re->outbuf_free_region_for_update = evas_software_xlib_outbuf_free_region_for_update;
             re->outbuf_flush = evas_software_xlib_outbuf_flush;
             re->outbuf_idle_flush = evas_software_xlib_outbuf_idle_flush;
	     re->outbuf_alpha_get = evas_software_xlib_outbuf_alpha_get;
          }
#endif

#ifdef BUILD_ENGINE_SOFTWARE_XCB
        if (info->info.backend == EVAS_ENGINE_INFO_SOFTWARE_X11_BACKEND_XCB)
          {
             re = _output_xcb_setup(e->output.w,
                                    e->output.h,
                                    info->info.rotation,
                                    info->info.connection,
                                    info->info.screen,
                                    info->info.drawable,
                                    info->info.visual,
                                    info->info.colormap,
                                    info->info.depth,
                                    info->info.debug,
                                    info->info.alloc_grayscale,
                                    info->info.alloc_colors_max,
                                    info->info.mask,
                                    info->info.shape_dither,
                                    info->info.destination_alpha);

             re->outbuf_free = evas_software_xcb_outbuf_free;
             re->outbuf_reconfigure = evas_software_xcb_outbuf_reconfigure;
             re->outbuf_get_rot = evas_software_xcb_outbuf_get_rot;
             re->outbuf_new_region_for_update = evas_software_xcb_outbuf_new_region_for_update;
             re->outbuf_push_updated_region = evas_software_xcb_outbuf_push_updated_region;
             re->outbuf_free_region_for_update = evas_software_xcb_outbuf_free_region_for_update;
             re->outbuf_flush = evas_software_xcb_outbuf_flush;
             re->outbuf_idle_flush = evas_software_xcb_outbuf_idle_flush;
	     re->outbuf_alpha_get = evas_software_xcb_outbuf_alpha_get;
          }
#endif

        e->engine.data.output = re;
     }
   else
     {
	int            ponebuf = 0;

	re = e->engine.data.output;
	ponebuf = re->ob->onebuf;

#ifdef BUILD_ENGINE_SOFTWARE_XLIB
        if (info->info.backend == EVAS_ENGINE_INFO_SOFTWARE_X11_BACKEND_XLIB)
          {
             evas_software_xlib_outbuf_free(re->ob);
             re->ob = evas_software_xlib_outbuf_setup_x(e->output.w,
                                                        e->output.h,
                                                        info->info.rotation,
                                                        OUTBUF_DEPTH_INHERIT,
                                                        info->info.connection,
                                                        info->info.drawable,
                                                        info->info.visual,
                                                        info->info.colormap,
                                                        info->info.depth,
                                                        info->info.alloc_grayscale,
                                                        info->info.alloc_colors_max,
                                                        info->info.mask,
                                                        info->info.shape_dither,
                                                        info->info.destination_alpha);
             evas_software_xlib_outbuf_debug_set(re->ob, info->info.debug);
          }
#endif

#ifdef BUILD_ENGINE_SOFTWARE_XCB
        if (info->info.backend == EVAS_ENGINE_INFO_SOFTWARE_X11_BACKEND_XCB)
          {
             evas_software_xcb_outbuf_free(re->ob);
             re->ob = evas_software_xcb_outbuf_setup_x(e->output.w,
                                                       e->output.h,
                                                       info->info.rotation,
                                                       OUTBUF_DEPTH_INHERIT,
                                                       info->info.connection,
                                                       info->info.screen,
                                                       info->info.drawable,
                                                       info->info.visual,
                                                       info->info.colormap,
                                                       info->info.depth,
                                                       info->info.alloc_grayscale,
                                                       info->info.alloc_colors_max,
                                                       info->info.mask,
                                                       info->info.shape_dither,
                                                       info->info.destination_alpha);
             evas_software_xcb_outbuf_debug_set(re->ob, info->info.debug);
          }
#endif
	re->ob->onebuf = ponebuf;
     }
   if (!e->engine.data.output) return 0;
   if (!e->engine.data.context)
     e->engine.data.context =
     e->engine.func->context_new(e->engine.data.output);

   re = e->engine.data.output;

   return 1;
}

static void
eng_output_free(void *data)
{
   Render_Engine *re;

   if (!data) return;

   re = (Render_Engine *)data;
   re->outbuf_free(re->ob);
   evas_common_tilebuf_free(re->tb);
   if (re->rects) evas_common_tilebuf_free_render_rects(re->rects);
   free(re);

   evas_common_font_shutdown();
   evas_common_image_shutdown();
}

static void
eng_output_resize(void *data, int w, int h)
{
   Render_Engine *re;

   re = (Render_Engine *)data;
   re->outbuf_reconfigure(re->ob, w, h,
                          re->outbuf_get_rot(re->ob),
                          OUTBUF_DEPTH_INHERIT);
   evas_common_tilebuf_free(re->tb);
   re->tb = evas_common_tilebuf_new(w, h);
   if (re->tb)
     evas_common_tilebuf_set_tile_size(re->tb, TILESIZE, TILESIZE);
}

static void
eng_output_tile_size_set(void *data, int w, int h)
{
   Render_Engine *re;

   re = (Render_Engine *)data;
   evas_common_tilebuf_set_tile_size(re->tb, w, h);
}

static void
eng_output_redraws_rect_add(void *data, int x, int y, int w, int h)
{
   Render_Engine *re;

   re = (Render_Engine *)data;
   evas_common_tilebuf_add_redraw(re->tb, x, y, w, h);
}

static void
eng_output_redraws_rect_del(void *data, int x, int y, int w, int h)
{
   Render_Engine *re;

   re = (Render_Engine *)data;
   evas_common_tilebuf_del_redraw(re->tb, x, y, w, h);
}

static void
eng_output_redraws_clear(void *data)
{
   Render_Engine *re;

   re = (Render_Engine *)data;
   evas_common_tilebuf_clear(re->tb);
}

static void *
eng_output_redraws_next_update_get(void *data, int *x, int *y, int *w, int *h, int *cx, int *cy, int *cw, int *ch)
{
   Render_Engine *re;
   RGBA_Image *surface;
   Tilebuf_Rect *rect;
   int ux, uy, uw, uh;

   re = (Render_Engine *)data;
   if (re->end)
     {
	re->end = 0;
	return NULL;
     }
   if (!re->rects)
     {
	re->rects = evas_common_tilebuf_get_render_rects(re->tb);
	re->cur_rect = EINA_INLIST_GET(re->rects);
     }
   if (!re->cur_rect) return NULL;
   rect = (Tilebuf_Rect *)re->cur_rect;
   ux = rect->x; uy = rect->y; uw = rect->w; uh = rect->h;
   re->cur_rect = re->cur_rect->next;
   if (!re->cur_rect)
     {
	evas_common_tilebuf_free_render_rects(re->rects);
	re->rects = NULL;
	re->end = 1;
     }

   surface = re->outbuf_new_region_for_update (re->ob, ux, uy, uw, uh, cx, cy, cw, ch);
   *x = ux; *y = uy; *w = uw; *h = uh;
   return surface;
}

static void
eng_output_redraws_next_update_push(void *data, void *surface, int x, int y, int w, int h)
{
   Render_Engine *re;

   re = (Render_Engine *)data;
#ifdef BUILD_PIPE_RENDER
   evas_common_pipe_begin(surface);
   evas_common_pipe_flush(surface);
#endif   
   re->outbuf_push_updated_region(re->ob, surface, x, y, w, h);
   re->outbuf_free_region_for_update(re->ob, surface);
   evas_common_cpu_end_opt();
}

static void
eng_output_flush(void *data)
{
   Render_Engine *re;

   re = (Render_Engine *)data;
   re->outbuf_flush(re->ob);
}

static void
eng_output_idle_flush(void *data)
{
   Render_Engine *re;

   re = (Render_Engine *)data;
   re->outbuf_idle_flush(re->ob);
}

static Eina_Bool
eng_canvas_alpha_get(void *data, void *context)
{
   Render_Engine *re;

   re = (Render_Engine *)data;
   return (re->ob->priv.destination_alpha) || (re->outbuf_alpha_get(re->ob));
}

/* module advertising code */
static int
module_open(Evas_Module *em)
{
   if (!em) return 0;
   /* get whatever engine module we inherit from */
   if (!_evas_module_engine_inherit(&pfunc, "software_generic")) return 0;
   /* store it for later use */
   func = pfunc;
   /* now to override methods */
#define ORD(f) EVAS_API_OVERRIDE(f, &func, eng_)
   ORD(info);
   ORD(info_free);
   ORD(setup);
   ORD(canvas_alpha_get);
   ORD(output_free);
   ORD(output_resize);
   ORD(output_tile_size_set);
   ORD(output_redraws_rect_add);
   ORD(output_redraws_rect_del);
   ORD(output_redraws_clear);
   ORD(output_redraws_next_update_get);
   ORD(output_redraws_next_update_push);
   ORD(output_flush);
   ORD(output_idle_flush);
   /* now advertise out own api */
   em->functions = (void *)(&func);
   return 1;
}

static void
module_close(Evas_Module *em)
{
}

static Evas_Module_Api evas_modapi =
{
   EVAS_MODULE_API_VERSION,
   "software_x11",
   "none",
   {
     module_open,
     module_close
   }
};

EVAS_MODULE_DEFINE(EVAS_MODULE_TYPE_ENGINE, engine, software_x11);

#ifndef EVAS_STATIC_BUILD_SOFTWARE_X11
EVAS_EINA_MODULE_DEFINE(engine, software_x11);
#endif