зеркало из https://github.com/mozilla/gecko-dev.git
145 строки
4.5 KiB
C++
145 строки
4.5 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_image_BMPFileHeaders_h
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#define mozilla_image_BMPFileHeaders_h
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namespace mozilla {
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namespace image {
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struct BMPFILEHEADER {
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char signature[2]; // String "BM"
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uint32_t filesize;
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int32_t reserved; // Zero
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uint32_t dataoffset; // Offset to raster data
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uint32_t bihsize;
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};
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// The length of the bitmap file header as defined in the BMP spec.
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#define BFH_LENGTH 14
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// Internally we store the bitmap file header with an additional 4 bytes which
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// is used to store the bitmap information header size.
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#define BFH_INTERNAL_LENGTH 18
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#define OS2_INTERNAL_BIH_LENGTH 8
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#define WIN_V3_INTERNAL_BIH_LENGTH 36
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#define WIN_V5_INTERNAL_BIH_LENGTH 120
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#define OS2_BIH_LENGTH 12 // This is the real BIH size (as contained in the
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// bihsize field of BMPFILEHEADER)
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#define WIN_V3_BIH_LENGTH 40 // This is the real BIH size (as contained in the
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// bihsize field of BMPFILEHEADER)
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#define WIN_V5_BIH_LENGTH 124 // This is the real BIH size (as contained in the
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// bihsize field of BMPFILEHEADER)
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#define OS2_HEADER_LENGTH (BFH_INTERNAL_LENGTH + OS2_INTERNAL_BIH_LENGTH)
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#define WIN_V3_HEADER_LENGTH (BFH_INTERNAL_LENGTH + WIN_V3_INTERNAL_BIH_LENGTH)
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#define WIN_V5_HEADER_LENGTH (BFH_INTERNAL_LENGTH + WIN_V5_INTERNAL_BIH_LENGTH)
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#ifndef LCS_sRGB
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#define LCS_sRGB 0x73524742
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#endif
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struct xyz {
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int32_t x, y, z;
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};
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struct xyzTriple {
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xyz r, g, b;
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};
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struct BITMAPV5HEADER {
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int32_t width; // Uint16 in OS/2 BMPs
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int32_t height; // Uint16 in OS/2 BMPs
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uint16_t planes; // =1
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uint16_t bpp; // Bits per pixel.
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// The rest of the header is not available in OS/2 BMP Files
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uint32_t compression; // 0=no compression 1=8bit RLE 2=4bit RLE
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uint32_t image_size; // (compressed) image size. Can be 0 if
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// compression==0
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uint32_t xppm; // Pixels per meter, horizontal
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uint32_t yppm; // Pixels per meter, vertical
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uint32_t colors; // Used Colors
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uint32_t important_colors; // Number of important colors. 0=all
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uint32_t red_mask; // Bits used for red component
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uint32_t green_mask; // Bits used for green component
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uint32_t blue_mask; // Bits used for blue component
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uint32_t alpha_mask; // Bits used for alpha component
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uint32_t color_space; // 0x73524742=LCS_sRGB ...
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// These members are unused unless color_space == LCS_CALIBRATED_RGB
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xyzTriple white_point; // Logical white point
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uint32_t gamma_red; // Red gamma component
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uint32_t gamma_green; // Green gamma component
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uint32_t gamma_blue; // Blue gamma component
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uint32_t intent; // Rendering intent
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// These members are unused unless color_space == LCS_PROFILE_*
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uint32_t profile_offset; // Offset to profile data in bytes
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uint32_t profile_size; // Size of profile data in bytes
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uint32_t reserved; // =0
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};
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struct colorTable {
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uint8_t red;
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uint8_t green;
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uint8_t blue;
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};
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struct bitFields {
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uint32_t red;
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uint32_t green;
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uint32_t blue;
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uint8_t redLeftShift;
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uint8_t redRightShift;
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uint8_t greenLeftShift;
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uint8_t greenRightShift;
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uint8_t blueLeftShift;
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uint8_t blueRightShift;
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};
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} // namespace image
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} // namespace mozilla
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#define BITFIELD_LENGTH 12 // Length of the bitfields structure in the bmp file
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#define USE_RGB
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// BMPINFOHEADER.compression defines
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#ifndef BI_RGB
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#define BI_RGB 0
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#endif
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#ifndef BI_RLE8
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#define BI_RLE8 1
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#endif
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#ifndef BI_RLE4
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#define BI_RLE4 2
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#endif
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#ifndef BI_BITFIELDS
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#define BI_BITFIELDS 3
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#endif
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// BI_ALPHABITFIELDS means no compression and specifies alpha bits
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// valid only for 32bpp and 16bpp
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#ifndef BI_ALPHABITFIELDS
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#define BI_ALPHABITFIELDS 4
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#endif
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// RLE Escape codes
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#define RLE_ESCAPE 0
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#define RLE_ESCAPE_EOL 0
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#define RLE_ESCAPE_EOF 1
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#define RLE_ESCAPE_DELTA 2
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/// enums for mState
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enum ERLEState {
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eRLEStateInitial,
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eRLEStateNeedSecondEscapeByte,
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eRLEStateNeedXDelta,
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eRLEStateNeedYDelta, ///< mStateData will hold x delta
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eRLEStateAbsoluteMode, ///< mStateData will hold count of existing data
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///< to read
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eRLEStateAbsoluteModePadded ///< As above, but another byte of data has to
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///< be read as padding
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};
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#endif // mozilla_image_BMPFileHeaders_h
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