bmp.htm

各种文件格式说明及程序描述

    indexes in their high- and low-order nibbles, one color index for each pixel.<br>
    in absolute mode, each run must be aligned on a word boundary. the<br>
    end-of-line, end-of-bitmap, and delta escapes also apply to bi_rle4.<br>
    <br>
    the following example shows the hexadecimal values of a 4-bit compressed<br>
    bitmap:<br>
    <br>
    <br>
    <br>
    03 04 05 06 00 06 45 56 67 00 04 78 00 02 05 01<br>
    04 78 00 00 09 1e 00 01<br>
    <br>
    this bitmap would expand as follows (single-digit values represent a color<br>
    index for a single pixel):<br>
    <br>
    <br>
    <br>
    0 4 0<br>
    0 6 0 6 0<br>
    4 5 5 6 6 7<br>
    7 8 7 8<br>
    move current position 5 right and 1 down<br>
    7 8 7 8<br>
    end of line<br>
    1 e 1 e 1 e 1 e 1<br>
    end of rle bitmap<br>
    <br>
    see also<br>
    <br>
    bitmapinfo <br>
    <br>
    ==============================================================================<br>
    rgbquad (3.0)<br>
    <br>
    <br>
    <br>
    typedef struct tagrgbquad { /* rgbq */<br>
    byte rgbblue;<br>
    byte rgbgreen;<br>
    byte rgbred;<br>
    byte rgbreserved;<br>
    } rgbquad;<br>
    <br>
    the rgbquad structure describes a color consisting of relative intensities of<br>
    red, green, and blue. the bmicolors member of the bitmapinfo structure<br>
    consists of an array of rgbquad structures.<br>
    <br>
    member description<br>
    <br>
    rgbblue specifies the intensity of blue in the color. <br>
    rgbgreenspecifies the intensity of green in the color. <br>
    rgbred specifies the intensity of red in the color. <br>
    rgbreserved not used; must be set to zero. <br>
    <br>
    see also<br>
    <br>
    bitmapinfo <br>
    <br>
    ==============================================================================<br>
    rgb (2.x)<br>
    <br>
    colorref rgb(cred, cgreen, cblue)<br>
    <br>
    byte cred; /* red component of color */<br>
    byte cgreen; /* green component of color */<br>
    byte cblue; /* blue component of color */<br>
    <br>
    <br>
    the rgb macro selects an rgb color based on the parameters supplied and the<br>
    color capabilities of the output device.<br>
    <br>
    parameter description<br>
    <br>
    cred specifies the intensity of the red color field. <br>
    cgreen specifies the intensity of the green color field. <br>
    cblue specifies the intensity of the blue color field. <br>
    <br>
    returns<br>
    <br>
    the return value specifies the resultant rgb color. <br>
    <br>
    comments<br>
    <br>
    the intensity for each argument can range from 0 through 255. if all three<br>
    intensities are specified as zero, the result is black. if all three<br>
    intensities are specified as 255, the result is white.<br>
    <br>
    comments<br>
    <br>
    the rgb macro is defined in windows.h as follows: <br>
    <br>
    <br>
    <br>
    #define rgb(r,g,b) ((colorref)(((byte)(r)|((word)(g)&lt;&lt;8))| \<br>
    (((dword)(byte)(b))&lt;&lt;16)))<br>
    <br>
    see also<br>
    <br>
    getbvalue, getgvalue, getrvalue, paletteindex, palettergb<br>
    <br>
    ==============================================================================<br>
    bitmapcoreinfo (3.0)<br>
    <br>
    <br>
    <br>
    typedef struct tagbitmapcoreinfo { /* bmci */<br>
    bitmapcoreheader bmciheader;<br>
    rgbtriple bmcicolors[1];<br>
    } bitmapcoreinfo;<br>
    <br>
    the bitmapcoreinfo structure fully defines the dimensions and color<br>
    information for a device-independent bitmap (dib). windows applications<br>
    should use the bitmapinfo structure instead of bitmapcoreinfo whenever<br>
    possible.<br>
    <br>
    member description<br>
    <br>
    bmciheader specifies a bitmapcoreheader structure that contains<br>
    information about the dimensions and color format of a dib.<br>
    <br>
    bmcicolors specifies an array of rgbtriple structures that define the<br>
    colors in the bitmap.<br>
    <br>
    comments<br>
    <br>
    the bitmapcoreinfo structure describes the dimensions and colors of a bitmap.<br>
    it is followed immediately in memory by an array of bytes which define the<br>
    pixels of the bitmap. the bits in the array are packed together, but each<br>
    scan line must be zero-padded to end on a long boundary. segment boundaries,<br>
    however, can appear anywhere in the bitmap. the origin of the bitmap is the<br>
    lower-left corner.<br>
    <br>
    the bcbitcount member of the bitmapcoreheader structure determines the number<br>
    of bits that define each pixel and the maximum number of colors in the<br>
    bitmap. this member may be set to any of the following values:<br>
    <br>
    value meaning<br>
    <br>
    1 the bitmap is monochrome, and the bmcicolors member must contain two<br>
    entries. each bit in the bitmap array represents a pixel. if the bit is<br>
    clear, the pixel is displayed with the color of the first entry in the<br>
    bmcicolors table. if the bit is set, the pixel has the color of the second<br>
    entry in the table.<br>
    <br>
    4 the bitmap has a maximum of 16 colors, and the bmcicolors member<br>
    contains 16 entries. each pixel in the bitmap is represented by a four-bit<br>
    index into the color table.<br>
    <br>
    for example, if the first byte in the bitmap is 0x1f, the byte represents two<br>
    pixels. the first pixel contains the color in the second table entry, and the<br>
    second pixel contains the color in the sixteenth table entry.<br>
    <br>
    8 the bitmap has a maximum of 256 colors, and the bmcicolors member<br>
    contains 256 entries. in this case, each byte in the array represents a<br>
    single pixel.<br>
    <br>
    24 the bitmap has a maximum of 2^24 colors. the bmcicolors member is<br>
    null, and each 3-byte sequence in the bitmap array represents the relative<br>
    intensities of red, green, and blue, respectively, of a pixel.<br>
    <br>
    the colors in the bmcicolors table should appear in order of importance.<br>
    alternatively, for functions that use dibs, the bmcicolors member can be an<br>
    array of 16-bit unsigned integers that specify an index into the currently<br>
    realized logical palette instead of explicit rgb values. in this case, an<br>
    application using the bitmap must call dib functions with the wusage<br>
    parameter set to dib_pal_colors.<br>
    <br>
    note: the bmcicolors member should not contain palette indexes if the<br>
    bitmap is to be stored in a file or transferred to another application.<br>
    unless the application uses the bitmap exclusively and under its complete<br>
    control, the bitmap color table should contain explicit rgb values.<br>
    <br>
    see also<br>
    <br>
    bitmapinfo, bitmapcoreheader, rgbtriple <br>
    <br>
    <br>
    ==============================================================================<br>
    bitmapcoreheader (3.0)<br>
    <br>
    <br>
    <br>
    typedef struct tagbitmapcoreheader { /* bmch */<br>
    dword bcsize;<br>
    short bcwidth;<br>
    short bcheight;<br>
    word bcplanes;<br>
    word bcbitcount;<br>
    } bitmapcoreheader;<br>
    <br>
    the bitmapcoreheader structure contains information about the dimensions and<br>
    color format of a device-independent bitmap (dib). windows applications<br>
    should use the bitmapinfoheader structure instead of bitmapcoreheader<br>
    whenever possible.<br>
    <br>
    member description<br>
    <br>
    bcsize specifies the number of bytes required by the<br>
    bitmapcoreheader structure.<br>
    <br>
    bcwidth specifies the width of the bitmap, in pixels. <br>
    bcheightspecifies the height of the bitmap, in pixels. <br>
    <br>
    bcplanesspecifies the number of planes for the target device. this<br>
    member must be set to 1.<br>
    <br>
    bcbitcount specifies the number of bits per pixel. this value must be 1,<br>
    4, 8, or 24.<br>
    <br>
    comments<br>
    <br>
    the bitmapcoreinfo structure combines the bitmapcoreheader structure and a<br>
    color table to provide a complete definition of the dimensions and colors of<br>
    a dib. see the description of the bitmapcoreinfo structure for more<br>
    information about specifying a dib.<br>
    <br>
    an application should use the information stored in the bcsize member to<br>
    locate the color table in a bitmapcoreinfo structure with a method such as<br>
    the following:<br>
    <br>
    <br>
    <br>
    lpcolor = ((lpstr) pbitmapcoreinfo + (uint) (pbitmapcoreinfo-&gt;bcsize))<br>
    <br>
    see also<br>
    <br>
    bitmapcoreinfo, bitmapinfoheader, bitmapinfoheader <br>
    <br>
    =============================================================================<br>
    rgbtriple (3.0)<br>
    <br>
    <br>
    <br>
    typedef struct tagrgbtriple { /* rgbt */<br>
    byte rgbtblue;<br>
    byte rgbtgreen;<br>
    byte rgbtred;<br>
    } rgbtriple;<br>
    <br>
    the rgbtriple structure describes a color consisting of relative intensities<br>
    of red, green, and blue. the bmcicolors member of the bitmapcoreinfo<br>
    structure consists of an array of rgbtriple structures. windows applications<br>
    should use the bitmapinfo structure instead of bitmapcoreinfo whenever<br>
    possible. the bitmapinfo structure uses an rgbquad structure instead of the<br>
    rgbtriple structure.<br>
    <br>
    member description<br>
    <br>
    rgbtbluespecifies the intensity of blue in the color. <br>
    rgbtgreen specifies the intensity of green in the color. <br>
    rgbtred specifies the intensity of red in the color.<br>
    <br>
    see also<br>
    <br>
    bitmapcoreinfo, bitmapinfo, rgbquad</td>
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