bmp.h

#ifndef BMP_H
#define BMP_H 1
 
#ifdef __cplusplus
extern "C" {
#endif
 
/*
        gd_bmp.c
 
        Bitmap format support for libgd
 
        * Written 2007, Scott MacVicar
        ---------------------------------------------------------------------------
 
        Todo:
 
        RLE4, RLE8 and Bitfield encoding
        Add full support for Windows v4 and Windows v5 header formats
 
        ----------------------------------------------------------------------------
 */
 
#define BMP_PALETTE_3 1
#define BMP_PALETTE_4 2
 
#define BMP_WINDOWS_V3 40
#define BMP_WINDOWS_V2 52
#define BMP_WINDOWS_V3_ALPHA 56
#define BMP_OS2_V1 12
#define BMP_OS2_V2_SHORT 16
#define BMP_OS2_V2 64
#define BMP_WINDOWS_V4 108
#define BMP_WINDOWS_V5 124
 
#define BMP_BI_RGB 0
#define BMP_BI_RLE8 1
#define BMP_BI_RLE4 2
#define BMP_BI_BITFIELDS 3
#define BMP_BI_JPEG 4
#define BMP_BI_PNG 5
#define BMP_BI_ALPHABITFIELDS 6
 
#define BMP_RLE_COMMAND 0
#define BMP_RLE_ENDOFLINE 0
#define BMP_RLE_ENDOFBITMAP 1
#define BMP_RLE_DELTA 2
 
#define BMP_RLE_TYPE_RAW 0
#define BMP_RLE_TYPE_RLE 1
 
/* BMP header. */
typedef struct {
    /* 16 bit - header identifying the type */
    signed short int magic;
 
    /* 32bit - size of the file */
    int size;
 
    /* 16bit - these two are in the spec but "reserved" */
    signed short int reserved1;
    signed short int reserved2;
 
    /* 32 bit - offset of the bitmap header from data in bytes */
    signed int off;
 
} bmp_hdr_t;
 
/* BMP info. */
typedef struct {
    /* 16bit - Type, ie Windows or OS/2 for the palette info */
    signed short int type;
    /* 32bit - The length of the bitmap information header in bytes. */
    signed int len;
 
    /* 32bit - The width of the bitmap in pixels. */
    signed int width;
 
    /* 32bit - The height of the bitmap in pixels. */
    signed int height;
 
    /* 8 bit - The bitmap data is specified in top-down order. */
    signed char topdown;
 
    /* 16 bit - The number of planes.  This must be set to a value of one. */
    signed short int numplanes;
 
    /* 16 bit - The number of bits per pixel. */
    signed short int depth;
 
    /* 32bit - The type of compression used. */
    signed int enctype;
 
    /* 32bit - The size of the image in bytes. */
    signed int size;
 
    /* 32bit - The horizontal resolution in pixels/metre. */
    signed int hres;
 
    /* 32bit - The vertical resolution in pixels/metre. */
    signed int vres;
 
    /* 32bit - The number of color indices used by the bitmap. */
    signed int numcolors;
 
    /* 32bit - The number of color indices important for displaying the bitmap.
     */
    signed int mincolors;
 
    /* 32bit - Color masks for BI_BITFIELDS and v4/v5 headers. */
    unsigned int red_mask;
    unsigned int green_mask;
    unsigned int blue_mask;
    unsigned int alpha_mask;
 
} bmp_info_t;
 
#ifdef __cplusplus
}
#endif
 
#endif