The Tor Browser: image/src/BMPFileHeaders.h@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 /* This Source Code Form is subject to the terms of the Mozilla Public

     2  * License, v. 2.0. If a copy of the MPL was not distributed with this

     3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     5 #ifndef MOZILLA_IMAGELIB_BMPHEADERS_H_

     6 #define MOZILLA_IMAGELIB_BMPHEADERS_H_

     8 namespace mozilla {

     9   namespace image {

    11     struct BMPFILEHEADER {

    12       char signature[2]; // String "BM"

    13       uint32_t filesize;

    14       int32_t reserved; // Zero

    15       uint32_t dataoffset; // Offset to raster data

    17       uint32_t bihsize;

    18     };

    20 // The length of the bitmap file header as defined in the BMP spec.

    21 #define BFH_LENGTH 14

    22 // Internally we store the bitmap file header with an additional 4 bytes which

    23 // is used to store the bitmap information header size.

    24 #define BFH_INTERNAL_LENGTH 18

    26 #define OS2_INTERNAL_BIH_LENGTH 8

    27 #define WIN_V3_INTERNAL_BIH_LENGTH 36

    28 #define WIN_V5_INTERNAL_BIH_LENGTH 120

    30 #define OS2_BIH_LENGTH 12 // This is the real BIH size (as contained in the bihsize field of BMPFILEHEADER)

    31 #define WIN_V3_BIH_LENGTH 40 // This is the real BIH size (as contained in the bihsize field of BMPFILEHEADER)

    32 #define WIN_V5_BIH_LENGTH 124 // This is the real BIH size (as contained in the bihsize field of BMPFILEHEADER)

    34 #define OS2_HEADER_LENGTH (BFH_INTERNAL_LENGTH + OS2_INTERNAL_BIH_LENGTH)

    35 #define WIN_V3_HEADER_LENGTH (BFH_INTERNAL_LENGTH + WIN_V3_INTERNAL_BIH_LENGTH)

    36 #define WIN_V5_HEADER_LENGTH (BFH_INTERNAL_LENGTH + WIN_V5_INTERNAL_BIH_LENGTH)

    38 #ifndef LCS_sRGB

    39 #define LCS_sRGB 0x73524742

    40 #endif

    42     struct xyz {

    43       int32_t x, y, z;

    44     };

    46     struct xyzTriple {

    47       xyz r, g, b;

    48     };

    50     struct BITMAPV5HEADER {

    51       int32_t width; // Uint16 in OS/2 BMPs

    52       int32_t height; // Uint16 in OS/2 BMPs

    53       uint16_t planes; // =1

    54       uint16_t bpp; // Bits per pixel.

    55       // The rest of the header is not available in OS/2 BMP Files

    56       uint32_t compression; // 0=no compression 1=8bit RLE 2=4bit RLE

    57       uint32_t image_size; // (compressed) image size. Can be 0 if compression==0

    58       uint32_t xppm; // Pixels per meter, horizontal

    59       uint32_t yppm; // Pixels per meter, vertical

    60       uint32_t colors; // Used Colors

    61       uint32_t important_colors; // Number of important colors. 0=all

    62       uint32_t red_mask;   // Bits used for red component

    63       uint32_t green_mask; // Bits used for green component

    64       uint32_t blue_mask;  // Bits used for blue component

    65       uint32_t alpha_mask; // Bits used for alpha component

    66       uint32_t color_space; // 0x73524742=LCS_sRGB ...

    67       // These members are unused unless color_space == LCS_CALIBRATED_RGB

    68       xyzTriple white_point; // Logical white point

    69       uint32_t gamma_red;   // Red gamma component

    70       uint32_t gamma_green; // Green gamma component

    71       uint32_t gamma_blue;  // Blue gamma component

    72       uint32_t intent; // Rendering intent

    73       // These members are unused unless color_space == LCS_PROFILE_*

    74       uint32_t profile_offset; // Offset to profile data in bytes

    75       uint32_t profile_size; // Size of profile data in bytes

    76       uint32_t reserved; // =0

    77     };

    79     struct colorTable {

    80       uint8_t red;

    81       uint8_t green;

    82       uint8_t blue;

    83     };

    85     struct bitFields {

    86       uint32_t red;

    87       uint32_t green;

    88       uint32_t blue;

    89       uint8_t redLeftShift;

    90       uint8_t redRightShift;

    91       uint8_t greenLeftShift;

    92       uint8_t greenRightShift;

    93       uint8_t blueLeftShift;

    94       uint8_t blueRightShift;

    95     };

    97   } // namespace image

    98 } // namespace mozilla

   100 #define BITFIELD_LENGTH 12 // Length of the bitfields structure in the bmp file

   101 #define USE_RGB

   103 // BMPINFOHEADER.compression defines

   104 #ifndef BI_RGB

   105 #define BI_RGB 0

   106 #endif

   107 #ifndef BI_RLE8

   108 #define BI_RLE8 1

   109 #endif

   110 #ifndef BI_RLE4

   111 #define BI_RLE4 2

   112 #endif

   113 #ifndef BI_BITFIELDS

   114 #define BI_BITFIELDS 3

   115 #endif

   116 // BI_ALPHABITFIELDS  means no compression and specifies alpha bits

   117 // valid only for 32bpp and 16bpp

   118 #ifndef BI_ALPHABITFIELDS

   119 #define BI_ALPHABITFIELDS 4

   120 #endif

   122 // RLE Escape codes

   123 #define RLE_ESCAPE       0

   124 #define RLE_ESCAPE_EOL   0

   125 #define RLE_ESCAPE_EOF   1

   126 #define RLE_ESCAPE_DELTA 2

   128 /// enums for mState

   129 enum ERLEState {

   130   eRLEStateInitial,

   131   eRLEStateNeedSecondEscapeByte,

   132   eRLEStateNeedXDelta,

   133   eRLEStateNeedYDelta,    ///< mStateData will hold x delta

   134   eRLEStateAbsoluteMode,  ///< mStateData will hold count of existing data to read

   135   eRLEStateAbsoluteModePadded ///< As above, but another byte of data has to be read as padding

   136 };

   138 #endif

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