/*
 *  GRUB  --  GRand Unified Bootloader
 *  Copyright (C) 2006,2007,2008  Free Software Foundation, Inc.
 *
 *  GRUB 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 3 of the License, or
 *  (at your option) any later version.
 *
 *  GRUB 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 GRUB.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef GRUB_VIDEO_HEADER
#define GRUB_VIDEO_HEADER	1

#include <grub/err.h>
#include <grub/types.h>

/* Video color in hardware dependent format.  Users should not assume any
   specific coding format.  */
typedef grub_uint32_t grub_video_color_t;

/* This structure is driver specific and should not be accessed directly by
   outside code.  */
struct grub_video_render_target;

/* Forward declarations for used data structures.  */
struct grub_font_glyph;
struct grub_video_bitmap;

/* Defines used to describe video mode or rendering target.  */
#define GRUB_VIDEO_MODE_TYPE_ALPHA		0x00000008
#define GRUB_VIDEO_MODE_TYPE_DOUBLE_BUFFERED	0x00000004
#define GRUB_VIDEO_MODE_TYPE_INDEX_COLOR	0x00000002
#define GRUB_VIDEO_MODE_TYPE_RGB		0x00000001

/* Defines used to mask flags.  */
#define GRUB_VIDEO_MODE_TYPE_COLOR_MASK		0x00000003

/* Defines used to specify requested bit depth.  */
#define GRUB_VIDEO_MODE_TYPE_DEPTH_MASK		0x0000ff00
#define GRUB_VIDEO_MODE_TYPE_DEPTH_POS		8

/* Defined predefined render targets.  */
#define GRUB_VIDEO_RENDER_TARGET_DISPLAY	((struct grub_video_render_target *) 0)
#define GRUB_VIDEO_RENDER_TARGET_FRONT_BUFFER	((struct grub_video_render_target *) 0)
#define GRUB_VIDEO_RENDER_TARGET_BACK_BUFFER	((struct grub_video_render_target *) 1)

/* Defined blitting formats.  */
enum grub_video_blit_format
  {
    /* Generic RGBA, use fields & masks.  */
    GRUB_VIDEO_BLIT_FORMAT_RGBA,

    /* Optimized RGBA's.  */
    GRUB_VIDEO_BLIT_FORMAT_RGBA_8888,
    GRUB_VIDEO_BLIT_FORMAT_BGRA_8888,

    /* Generic RGB, use fields & masks.  */
    GRUB_VIDEO_BLIT_FORMAT_RGB,

    /* Optimized RGB's.  */
    GRUB_VIDEO_BLIT_FORMAT_RGB_888,
    GRUB_VIDEO_BLIT_FORMAT_BGR_888,
    GRUB_VIDEO_BLIT_FORMAT_RGB_565,
    GRUB_VIDEO_BLIT_FORMAT_BGR_565,

    /* When needed, decode color or just use value as is.  */
    GRUB_VIDEO_BLIT_FORMAT_INDEXCOLOR
  };

/* Define blitting operators.  */
enum grub_video_blit_operators
  {
    /* Replace target bitmap data with source.  */
    GRUB_VIDEO_BLIT_REPLACE,
    /* Blend target and source based on source's alpha value.  */
    GRUB_VIDEO_BLIT_BLEND
  };

struct grub_video_mode_info
{
  /* Width of the screen.  */
  unsigned int width;

  /* Height of the screen.  */
  unsigned int height;

  /* Mode type bitmask.  Contains information like is it Index color or
     RGB mode.  */
  unsigned int mode_type;

  /* Bits per pixel.  */
  unsigned int bpp;

  /* Bytes per pixel.  */
  unsigned int bytes_per_pixel;

  /* Pitch of one scanline.  How many bytes there are for scanline.  */
  unsigned int pitch;

  /* In index color mode, number of colors.  In RGB mode this is 256.  */
  unsigned int number_of_colors;

  /* Optimization hint how binary data is coded.  */
  enum grub_video_blit_format blit_format;

  /* How many bits are reserved for red color.  */
  unsigned int red_mask_size;

  /* What is location of red color bits.  In Index Color mode, this is 0.  */
  unsigned int red_field_pos;

  /* How many bits are reserved for green color.  */
  unsigned int green_mask_size;

  /* What is location of green color bits.  In Index Color mode, this is 0.  */
  unsigned int green_field_pos;

  /* How many bits are reserved for blue color.  */
  unsigned int blue_mask_size;

  /* What is location of blue color bits.  In Index Color mode, this is 0.  */
  unsigned int blue_field_pos;

  /* How many bits are reserved in color.  */
  unsigned int reserved_mask_size;

  /* What is location of reserved color bits.  In Index Color mode,
     this is 0.  */
  unsigned int reserved_field_pos;
};

struct grub_video_palette_data
{
  grub_uint8_t r; /* Red color value (0-255).  */
  grub_uint8_t g; /* Green color value (0-255).  */
  grub_uint8_t b; /* Blue color value (0-255).  */
  grub_uint8_t a; /* Reserved bits value (0-255).  */
};

struct grub_video_adapter
{
  /* The video adapter name.  */
  const char *name;

  /* Initialize the video adapter.  */
  grub_err_t (*init) (void);

  /* Clean up the video adapter.  */
  grub_err_t (*fini) (void);

  grub_err_t (*setup) (unsigned int width,  unsigned int height,
                       unsigned int mode_type);

  grub_err_t (*get_info) (struct grub_video_mode_info *mode_info);

  grub_err_t (*set_palette) (unsigned int start, unsigned int count,
                             struct grub_video_palette_data *palette_data);

  grub_err_t (*get_palette) (unsigned int start, unsigned int count,
                             struct grub_video_palette_data *palette_data);

  grub_err_t (*set_viewport) (unsigned int x, unsigned int y,
                              unsigned int width, unsigned int height);

  grub_err_t (*get_viewport) (unsigned int *x, unsigned int *y,
                              unsigned int *width, unsigned int *height);

  grub_video_color_t (*map_color) (grub_uint32_t color_name);

  grub_video_color_t (*map_rgb) (grub_uint8_t red, grub_uint8_t green,
                                 grub_uint8_t blue);

  grub_video_color_t (*map_rgba) (grub_uint8_t red, grub_uint8_t green,
                                  grub_uint8_t blue, grub_uint8_t alpha);

  grub_err_t (*unmap_color) (grub_video_color_t color,
                             grub_uint8_t *red, grub_uint8_t *green,
                             grub_uint8_t *blue, grub_uint8_t *alpha);

  grub_err_t (*fill_rect) (grub_video_color_t color, int x, int y,
                           unsigned int width, unsigned int height);

  grub_err_t (*blit_glyph) (struct grub_font_glyph *glyph,
                            grub_video_color_t color, int x, int y);

  grub_err_t (*blit_bitmap) (struct grub_video_bitmap *bitmap,
                             enum grub_video_blit_operators oper,
                             int x, int y, int offset_x, int offset_y,
                             unsigned int width, unsigned int height);

  grub_err_t (*blit_render_target) (struct grub_video_render_target *source,
                                    enum grub_video_blit_operators oper,
                                    int x, int y, int offset_x, int offset_y,
                                    unsigned int width, unsigned int height);

  grub_err_t (*scroll) (grub_video_color_t color, int dx, int dy);

  grub_err_t (*swap_buffers) (void);

  grub_err_t (*create_render_target) (struct grub_video_render_target **result,
                                      unsigned int width, unsigned int height,
                                      unsigned int mode_type);

  grub_err_t (*delete_render_target) (struct grub_video_render_target *target);

  grub_err_t (*set_active_render_target) (struct grub_video_render_target *target);

  grub_err_t (*get_active_render_target) (struct grub_video_render_target **target);

  /* The next video adapter.  */
  struct grub_video_adapter *next;
};
typedef struct grub_video_adapter *grub_video_adapter_t;

void grub_video_register (grub_video_adapter_t adapter);
void grub_video_unregister (grub_video_adapter_t adapter);
void grub_video_iterate (int (*hook) (grub_video_adapter_t adapter));

grub_err_t grub_video_setup (unsigned int width, unsigned int height,
                             unsigned int mode_type);

grub_err_t grub_video_restore (void);

grub_err_t grub_video_get_info (struct grub_video_mode_info *mode_info);

enum grub_video_blit_format grub_video_get_blit_format (struct grub_video_mode_info *mode_info);

grub_err_t grub_video_set_palette (unsigned int start, unsigned int count,
                                   struct grub_video_palette_data *palette_data);

grub_err_t grub_video_get_palette (unsigned int start, unsigned int count,
                                   struct grub_video_palette_data *palette_data);

grub_err_t grub_video_set_viewport (unsigned int x, unsigned int y,
                                    unsigned int width, unsigned int height);

grub_err_t grub_video_get_viewport (unsigned int *x, unsigned int *y,
                                    unsigned int *width, unsigned int *height);

grub_video_color_t grub_video_map_color (grub_uint32_t color_name);

grub_video_color_t grub_video_map_rgb (grub_uint8_t red, grub_uint8_t green,
                                       grub_uint8_t blue);

grub_video_color_t grub_video_map_rgba (grub_uint8_t red, grub_uint8_t green,
                                        grub_uint8_t blue, grub_uint8_t alpha);

grub_err_t grub_video_unmap_color (grub_video_color_t color,
                                   grub_uint8_t *red, grub_uint8_t *green,
                                   grub_uint8_t *blue, grub_uint8_t *alpha);

grub_err_t grub_video_fill_rect (grub_video_color_t color, int x, int y,
                                 unsigned int width, unsigned int height);

grub_err_t grub_video_blit_glyph (struct grub_font_glyph *glyph,
                                  grub_video_color_t color, int x, int y);

grub_err_t grub_video_blit_bitmap (struct grub_video_bitmap *bitmap,
                                   enum grub_video_blit_operators oper,
                                   int x, int y, int offset_x, int offset_y,
                                   unsigned int width, unsigned int height);

grub_err_t grub_video_blit_render_target (struct grub_video_render_target *source,
                                          enum grub_video_blit_operators oper,
                                          int x, int y,
                                          int offset_x, int offset_y,
                                          unsigned int width,
                                          unsigned int height);

grub_err_t grub_video_scroll (grub_video_color_t color, int dx, int dy);

grub_err_t grub_video_swap_buffers (void);

grub_err_t grub_video_create_render_target (struct grub_video_render_target **result,
                                            unsigned int width,
                                            unsigned int height,
                                            unsigned int mode_type);

grub_err_t grub_video_delete_render_target (struct grub_video_render_target *target);

grub_err_t grub_video_set_active_render_target (struct grub_video_render_target *target);

grub_err_t grub_video_get_active_render_target (struct grub_video_render_target **target);

#endif /* ! GRUB_VIDEO_HEADER */
