grub/grub-core/include/grub/video.h

/*
 *  GRUB  --  GRand Unified Bootloader
 *  Copyright (C) 2006,2007,2008,2009  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>
#include <grub/list.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_video_bitmap;

/* Defines used to describe video mode or rendering target.  */
/* If following is set render target contains currenly displayed image
   after swapping buffers (otherwise it contains previously displayed image).
 */
#define GRUB_VIDEO_MODE_TYPE_UPDATING_SWAP	0x00000080
#define GRUB_VIDEO_MODE_TYPE_PURE_TEXT		0x00000040
#define GRUB_VIDEO_MODE_TYPE_ALPHA		0x00000020
#define GRUB_VIDEO_MODE_TYPE_DOUBLE_BUFFERED	0x00000010
#define GRUB_VIDEO_MODE_TYPE_1BIT_BITMAP	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		0x0000000F

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

/* The basic render target representing the whole display.  This always
   renders to the back buffer when double-buffering is in use.  */
#define GRUB_VIDEO_RENDER_TARGET_DISPLAY \
  ((struct grub_video_render_target *) 0)

/* 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,

    /* Two color bitmap; bits packed: rows are not padded to byte boundary.  */
    GRUB_VIDEO_BLIT_FORMAT_1BIT_PACKED
  };

/* 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;

  /* For 1-bit bitmaps, the background color.  Used for bits = 0.  */
  grub_uint8_t bg_red;
  grub_uint8_t bg_green;
  grub_uint8_t bg_blue;
  grub_uint8_t bg_alpha;

  /* For 1-bit bitmaps, the foreground color.  Used for bits = 1.  */
  grub_uint8_t fg_red;
  grub_uint8_t fg_green;
  grub_uint8_t fg_blue;
  grub_uint8_t fg_alpha;
};

/* A 2D rectangle type.  */
struct grub_video_rect
{
  unsigned x;
  unsigned y;
  unsigned width;
  unsigned height;
};
typedef struct grub_video_rect grub_video_rect_t;

struct grub_video_signed_rect
{
  signed x;
  signed y;
  unsigned width;
  unsigned height;
};
typedef struct grub_video_signed_rect grub_video_signed_rect_t;

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).  */
};

typedef enum grub_video_driver_id
  {
    GRUB_VIDEO_DRIVER_NONE,
    GRUB_VIDEO_DRIVER_VBE,
    GRUB_VIDEO_DRIVER_EFI_UGA,
    GRUB_VIDEO_DRIVER_EFI_GOP,
    GRUB_VIDEO_DRIVER_SM712,
    GRUB_VIDEO_DRIVER_VGA,
    GRUB_VIDEO_DRIVER_CIRRUS,
    GRUB_VIDEO_DRIVER_BOCHS,
    GRUB_VIDEO_DRIVER_SDL
  } grub_video_driver_id_t;

typedef enum grub_video_adapter_prio
  {
    GRUB_VIDEO_ADAPTER_PRIO_FALLBACK = 60,
    GRUB_VIDEO_ADAPTER_PRIO_FIRMWARE_DIRTY = 70,
    GRUB_VIDEO_ADAPTER_PRIO_FIRMWARE = 80,
    GRUB_VIDEO_ADAPTER_PRIO_NATIVE = 100
  } grub_video_adapter_prio_t;


struct grub_video_adapter
{
  /* The next video adapter.  */
  struct grub_video_adapter *next;

  /* The video adapter name.  */
  const char *name;
  grub_video_driver_id_t id;

  grub_video_adapter_prio_t prio;

  /* 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, unsigned int mode_mask);

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

  grub_err_t (*get_info_and_fini) (struct grub_video_mode_info *mode_info,
				   void **framebuffer);

  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_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);
};
typedef struct grub_video_adapter *grub_video_adapter_t;

extern grub_video_adapter_t EXPORT_VAR(grub_video_adapter_list);

#ifndef GRUB_LST_GENERATOR
/* Register video driver.  */
static inline void
grub_video_register (grub_video_adapter_t adapter)
{
  grub_video_adapter_t *p;
  for (p = &grub_video_adapter_list; *p && (*p)->prio > adapter->prio; 
       p = &((*p)->next));
  adapter->next = *p;
  *p = adapter;
}
#endif

/* Unregister video driver.  */
static inline void
grub_video_unregister (grub_video_adapter_t adapter)
{
  grub_list_remove (GRUB_AS_LIST_P (&grub_video_adapter_list),
		    GRUB_AS_LIST (adapter));
}

#define FOR_VIDEO_ADAPTERS(var) FOR_LIST_ELEMENTS((var), (grub_video_adapter_list))

grub_err_t EXPORT_FUNC (grub_video_restore) (void);

grub_err_t EXPORT_FUNC (grub_video_get_info) (struct grub_video_mode_info *mode_info);

/* Framebuffer address may change as a part of normal operation
   (e.g. double buffering). That's why you need to stop video subsystem to be
   sure that framebuffer address doesn't change. To ensure this abstraction
   grub_video_get_info_and_fini is the only function supplying framebuffer
   address. */
grub_err_t EXPORT_FUNC (grub_video_get_info_and_fini) (struct grub_video_mode_info *mode_info,
					 void **framebuffer);

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

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

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

grub_video_color_t EXPORT_FUNC (grub_video_map_color) (grub_uint32_t color_name);

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

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

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

grub_err_t EXPORT_FUNC (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 EXPORT_FUNC (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 EXPORT_FUNC (grub_video_swap_buffers) (void);

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

grub_err_t EXPORT_FUNC (grub_video_delete_render_target) (struct grub_video_render_target *target);

grub_err_t EXPORT_FUNC (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);

grub_err_t EXPORT_FUNC (grub_video_set_mode) (const char *modestring,
					      unsigned int modemask,
					      unsigned int modevalue);

static inline int
grub_video_check_mode_flag (unsigned int flags, unsigned int mask,
			    unsigned int flag, int def)
{
  return (flag & mask) ? !! (flags & flag) : def;
}

grub_video_driver_id_t EXPORT_FUNC (grub_video_get_driver_id) (void);

#endif /* ! GRUB_VIDEO_HEADER */