/* Copyright (c) 2010-2011 The Chromium OS Authors. All rights reserved.
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 *
 * Data structure definitions for firmware screen block (BMPBLOCK).
 *
 * The BmpBlock structure looks like:
 *  +-----------------------------------------+
 *  |             BmpBlock Header             |
 *  +-----------------------------------------+
 *  |             ScreenLayout[0]             | \
 *  +-----------------------------------------+  |
 *  |             ScreenLayout[1]             |  |
 *  +-----------------------------------------+  Localization[0]
 *  |                  ...                    |  |
 *  +-----------------------------------------+  |
 *  | ScreenLayout[number_of_screenlayouts-1] | /
 *  +-----------------------------------------+
 *  |             ScreenLayout[0]             | \
 *  +-----------------------------------------+  Localization[1]
 *  |                  ...                    | /
 *  +-----------------------------------------+        ...
 *  |             ScreenLayout[0]             | \
 *  +-----------------------------------------+  Localization[
 *  |                  ...                    | /   number_of_localizations-1]
 *  +-----------------------------------------+
 *  |              ImageInfo[0]               |
 *  +-----------------------------------------+
 *  |              Image Content              |
 *  +-----------------------------------------+
 *  |              ImageInfo[2]               |  ImageInfo is 4-byte aligned.
 *  +-----------------------------------------+
 *  |              Image Content              |
 *  +-----------------------------------------+
 *  |                  ...                    |
 *  +-----------------------------------------+
 *  |      ImageInfo[number_fo_images-1]      |
 *  +-----------------------------------------+
 *  |              Image Content              |
 *  +-----------------------------------------+
 *
 */

#ifndef VBOOT_REFERENCE_BMPBLK_HEADER_H_
#define VBOOT_REFERENCE_BMPBLK_HEADER_H_

#include "sysincludes.h"

__pragma(pack(push, 1))  /* Support packing for MSVC. */

#define BMPBLOCK_SIGNATURE      "$BMP"
#define BMPBLOCK_SIGNATURE_SIZE (4)

#define BMPBLOCK_MAJOR_VERSION  (0x0001)
#define BMPBLOCK_MINOR_VERSION  (0x0000)

#define MAX_IMAGE_IN_LAYOUT     (8)

/* BMPBLOCK header, describing how many screen layouts and image infos */
typedef struct BmpBlockHeader {
  uint8_t  signature[BMPBLOCK_SIGNATURE_SIZE];  /* BMPBLOCK_SIGNATURE $BMP */
  uint16_t major_version;            /* see BMPBLOCK_MAJOR_VER */
  uint16_t minor_version;            /* see BMPBLOCK_MINOR_VER */
  uint32_t number_of_localizations;  /* Number of localizations */
  uint32_t number_of_screenlayouts;  /* Number of screen layouts in each
                                      * localization */
  uint32_t number_of_imageinfos;     /* Number of image infos */
  uint32_t reserved[3];
} __attribute__((packed)) BmpBlockHeader;

/* Screen layout, describing how to stack multiple images on screen */
typedef struct ScreenLayout {
  struct {
    uint32_t x;                   /* X-offset of the image to be rendered */
    uint32_t y;                   /* Y-offset of the image to be rendered */
    uint32_t image_info_offset;   /* Offset of image info from start of
                                   * BMPBLOCK. 0 means end of it. */
  } images[MAX_IMAGE_IN_LAYOUT];  /* Images contained in the screen. Will be
                                   * rendered from 0 to (number_of_images-1). */
} __attribute__((packed)) ScreenLayout;

/* Constants for screen index */
typedef enum ScreenIndex {
  SCREEN_DEVELOPER_MODE = 0,
  SCREEN_RECOVERY_MODE,
  SCREEN_RECOVERY_NO_OS,
  SCREEN_RECOVERY_MISSING_OS,
  MAX_SCREEN_INDEX,
} ScreenIndex;

/* Image info, describing the information of the image block */
typedef struct ImageInfo {
  uint32_t tag;              /* Tag it as a special image, like HWID */
  uint32_t width;            /* Width of the image */
  uint32_t height;           /* Height of the image */
  uint32_t format;           /* File format of the image */
  uint32_t compression;      /* Compression method for the image file */
  uint32_t original_size;    /* Size of the original uncompressed image */
  uint32_t compressed_size;  /* Size of the compressed image */
  uint32_t reserved;
  /* NOTE: actual image content follows immediately */
} __attribute__((packed)) ImageInfo;

/* Constants for ImageInfo.tag */
typedef enum ImageTag {
  TAG_NONE = 0,
  TAG_HWID,
} ImageTag;

/* Constants for ImageInfo.format */
typedef enum ImageFormat {
  FORMAT_INVALID = 0,
  FORMAT_BMP,
} ImageFormat;

/* Constants for ImageInfo.compression */
typedef enum Compression {
  COMPRESS_NONE = 0,
  COMPRESS_EFIv1,           /* The x86 BIOS only supports this */
  COMPRESS_LZMA1,           /* The ARM BIOS supports LZMA1 */
  MAX_COMPRESS,
} Compression;

__pragma(pack(pop)) /* Support packing for MSVC. */

#endif  /* VBOOT_REFERENCE_BMPBLK_HEADER_H_ */