Private Type BITMAPFILEHEADER bfType As Integer bfSize As Long bfReserved1 As Integer bfReserved2 As Integer bfOffBits As Long End TypePrivate Type BITMAPINFOHEADER '40 bytes biSize As Long biWidth As Long biHeight As Long biPlanes As Integer biBitCount As Integer biCompression As Long biSizeImage As Long biXPelsPerMeter As Long biYPelsPerMeter As Long biClrUsed As Long biClrImportant As Long End TypePrivate Type RGBQUAD rgbBlue As Byte rgbGreen As Byte rgbRed As Byte rgbFlags As Byte End Type顺着读BITMAPFILEHEADER跟BITMAPINFOHEADER，如果是8位的则定义一个256个元素的COLOR ARRAY为RGBQUAD，否则没有颜色表，然后剩下的就是构成图象的字节了，如果是256色的话，一个字节就是一个颜色表里面的索引，否则的话就是直接的图象数据了，16位就是2个字节为一个点，分为555和565方式，24位就是3个字节一个点，32位就是4个字节一个点，其中三个为RGB，一个为ALPHA通道的FLAG值，注意颜色字节的顺序是BGR存放的，不要取倒了。另外，位图数据的编码开始位置也有两种，一种是从左上开始，一种是从左下开始的，第二种的比较少见。位图的数据还有可能是压缩的，需要靠INFOHEADER里面的biCompression标志来判断，如果是压缩的，则压缩方式为单行RLE方式，请参阅相关文件。4位、2位和1位的位图文件这里就不讨论了，因为需要涉及到位面，比较麻烦，应用也不多。
Graphics File FormatsThis topic describes the graphics-file formats used by the Microsoft Windows operating system. Graphics files include bitmap files, icon-resource files, and cursor-resource files.Bitmap-File FormatsWindows bitmap files are stored in a device-independent bitmap (DIB) format that allows Windows to display the bitmap on any type of display device. The term "device independent" means that the bitmap specifies pixel color in a form independent of the method used by a display to represent color. The default filename extension of a Windows DIB file is .BMP.Bitmap-File StructuresEach bitmap file contains a bitmap-file header, a bitmap-information header, a color table, and an array of bytes that defines the bitmap bits. The file has the following form:BITMAPFILEHEADER bmfh; BITMAPINFOHEADER bmih; RGBQUAD aColors[]; BYTE aBitmapBits[];The bitmap-file header contains information about the type, size, and layout of a device-independent bitmap file. The header is defined as a BITMAPFILEHEADER structure.The bitmap-information header, defined as a BITMAPINFOHEADER structure, specifies the dimensions, compression type, and color format for the bitmap.The color table, defined as an array of RGBQUAD structures, contains as many elements as there are colors in the bitmap. The color table is not present for bitmaps with 24 color bits because each pixel is represented by 24-bit red-green-blue (RGB) values in the actual bitmap data area. The colors in the table should appear in order of importance. This helps a display driver render a bitmap on a device that cannot display as many colors as there are in the bitmap. If the DIB is in Windows version 3.0 or later format, the driver can use the biClrImportant member of the BITMAPINFOHEADER structure to determine which colors are important.The BITMAPINFO structure can be used to represent a combined bitmap-information header and color table. The bitmap bits, immediately following the color table, consist of an array of BYTE values representing consecutive rows, or "scan lines," of the bitmap. Each scan line consists of consecutive bytes representing the pixels in the scan line, in left-to-right order. The number of bytes representing a scan line depends on the color format and the width, in pixels, of the bitmap. If necessary, a scan line must be zero-padded to end on a 32-bit boundary. However, segment boundaries can appear anywhere in the bitmap. The scan lines in the bitmap are stored from bottom up. This means that the first byte in the array represents the pixels in the lower-left corner of the bitmap and the last byte represents the pixels in the upper-right corner.The biBitCount member of the BITMAPINFOHEADER structure determines the number of bits that define each pixel and the maximum number of colors in the bitmap. These members can have any of the following values:Value Meaning1 Bitmap is monochrome and the color table contains two entries. Each bit in the bitmap array represents a pixel. If the bit is clear, the pixel is displayed with the color of the first entry in the color table. If the bit is set, the pixel has the color of the second entry in the table.4 Bitmap has a maximum of 16 colors. Each pixel in the bitmap is represented by a 4-bit index into the color table. For example, if the first byte in the bitmap is 0x1F, the byte represents two pixels. The first pixel contains the color in the second table entry, and the second pixel contains the color in the sixteenth table entry.8 Bitmap has a maximum of 256 colors. Each pixel in the bitmap is represented by a 1-byte index into the color table. For example, if the first byte in the bitmap is 0x1F, the first pixel has the color of the thirty-second table entry.24 Bitmap has a maximum of 2^24 colors. The bmiColors (or bmciColors) member is NULL, and each 3-byte sequence in the bitmap array represents the relative intensities of red, green, and blue, respectively, for a pixel.The biClrUsed member of the BITMAPINFOHEADER structure specifies the number of color indexes in the color table actually used by the bitmap. If the biClrUsed member is set to zero, the bitmap uses the maximum number of colors corresponding to the value of the biBitCount member. An alternative form of bitmap file uses the BITMAPCOREINFO, BITMAPCOREHEADER, and RGBTRIPLE structures.Bitmap CompressionWindows versions 3.0 and later support run-length encoded (RLE) formats for compressing bitmaps that use 4 bits per pixel and 8 bits per pixel. Compression reduces the disk and memory storage required for a bitmap.Compression of 8-Bits-per-Pixel BitmapsWhen the biCompression member of the BITMAPINFOHEADER structure is set to BI_RLE8, the DIB is compressed using a run-length encoded format for a 256-color bitmap. This format uses two modes: encoded mode and absolute mode. Both modes can occur anywhere throughout a single bitmap.Encoded ModeA unit of information in encoded mode consists of two bytes. The first byte specifies the number of consecutive pixels to be drawn using the color index contained in the second byte. The first byte of the pair can be set to zero to indicate an escape that denotes the end of a line, the end of the bitmap, or a delta. The interpretation of the escape depends on the value of the second byte of the pair, which must be in the range 0x00 through 0x02. Following are the meanings of the escape values that can be used in the second byte:Second byte Meaning0 End of line. 1 End of bitmap. 2 Delta. The two bytes following the escape contain unsigned values indicating the horizontal and vertical offsets of the next pixel from the current position.Absolute ModeAbsolute mode is signaled by the first byte in the pair being set to zero and the second byte to a value between 0x03 and 0xFF. The second byte represents the number of bytes that follow, each of which contains the color index of a single pixel. Each run must be aligned on a word boundary. Following is an example of an 8-bit RLE bitmap (the two-digit hexadecimal values in the second column represent a color index for a single pixel):Compressed data Expanded data03 04 04 04 04 05 06 06 06 06 06 06 00 03 45 56 67 00 45 56 67 02 78 78 78 00 02 05 01 Move 5 right and 1 down 02 78 78 78 00 00 End of line 09 1E 1E 1E 1E 1E 1E 1E 1E 1E 1E 00 01 End of RLE bitmap Compression of 4-Bits-per-Pixel BitmapsWhen the biCompression member of the BITMAPINFOHEADER structure is set to BI_RLE4, the DIB is compressed using a run-length encoded format for a 16-color bitmap. This format uses two modes: encoded mode and absolute mode.Encoded ModeA unit of information in encoded mode consists of two bytes. The first byte of the pair contains the number of pixels to be drawn using the color indexes in the second byte.The second byte contains two color indexes, one in its high-order nibble (that is, its low-order 4 bits) and one in its low-order nibble.The first pixel is drawn using the color specified by the high-order nibble, the second is drawn using the color in the low-order nibble, the third is drawn with the color in the high-order nibble, and so on, until all the pixels specified by the first byte have been drawn.The first byte of the pair can be set to zero to indicate an escape that denotes the end of a line, the end of the bitmap, or a delta. The interpretation of the escape depends on the value of the second byte of the pair. In encoded mode, the second byte has a value in the range 0x00 through 0x02. The meaning of these values is the same as for a DIB with 8 bits per pixel.Absolute ModeIn absolute mode, the first byte contains zero, the second byte contains the number of color indexes that follow, and subsequent bytes contain color indexes in their high- and low-order nibbles, one color index for each pixel. Each run must be aligned on a word boundary.Following is an example of a 4-bit RLE bitmap (the one-digit hexadecimal values in the second column represent a color index for a single pixel):Compressed data Expanded data03 04 0 4 0 05 06 0 6 0 6 0 00 06 45 56 67 00 4 5 5 6 6 7 04 78 7 8 7 8 00 02 05 01 Move 5 right and 1 down 04 78 7 8 7 8 00 00 End of line 09 1E 1 E 1 E 1 E 1 E 1 00 01 End of RLE bitmap Bitmap ExampleThe following example is a text dump of a 16-color bitmap (4 bits per pixel):Win3DIBFile BitmapFileHeader Type 19778 Size 3118 Reserved1 0 Reserved2 0 OffsetBits 118 BitmapInfoHeader Size 40 Width 80 Height 75 Planes 1 BitCount 4 Compression 0 SizeImage 3000 XPelsPerMeter 0 YPelsPerMeter 0 ColorsUsed 16 ColorsImportant 16 Win3ColorTable Blue Green Red Unused [00000000] 84 252 84 0 [00000001] 252 252 84 0 [00000002] 84 84 252 0 [00000003] 252 84 252 0 [00000004] 84 252 252 0 [00000005] 252 252 252 0 [00000006] 0 0 0 0 [00000007] 168 0 0 0 [00000008] 0 168 0 0 [00000009] 168 168 0 0 [0000000A] 0 0 168 0 [0000000B] 168 0 168 0 [0000000C] 0 168 168 0 [0000000D] 168 168 168 0 [0000000E] 84 84 84 0 [0000000F] 252 84 84 0 Image . . Bitmap data .Icon-Resource File FormatAn icon-resource file contains image data for icons used by Windows applications. The file consists of an icon directory identifying the number and types of icon images in the file, plus one or more icon images. The default filename extension for an icon-resource file is .ICO.Icon DirectoryEach icon-resource file starts with an icon directory. The icon directory, defined as an ICONDIR structure, specifies the number of icons in the resource and the dimensions and color format of each icon image. The ICONDIR structure has the following form:typedef struct ICONDIR { WORD idReserved; WORD idType; WORD idCount; ICONDIRENTRY idEntries[1]; } ICONHEADER;Following are the members in the ICONDIR structure:idReserved Reserved; must be zero. idType Specifies the resource type. This member is set to 1. idCount Specifies the number of entries in the directory. idEntries Specifies an array of ICONDIRENTRY structures containing information about individual icons. The idCount member specifies the number of structures in the array.The ICONDIRENTRY structure specifies the dimensions and color format for an icon. The structure has the following form:struct IconDirectoryEntry { BYTE bWidth; BYTE bHeight; BYTE bColorCount; BYTE bReserved; WORD wPlanes; WORD wBitCount; DWORD dwBytesInRes; DWORD dwImageOffset; };Following are the members in the ICONDIRENTRY structure: bWidth Specifies the width of the icon, in pixels. Acceptable values are 16, 32, and 64.bHeight Specifies the height of the icon, in pixels. Acceptable values are 16, 32, and 64.bColorCount Specifies the number of colors in the icon. Acceptable values are 2, 8, and 16.bReserved Reserved; must be zero. wPlanes Specifies the number of color planes in the icon bitmap. wBitCount Specifies the number of bits in the icon bitmap. dwBytesInRes Specifies the size of the resource, in bytes. dwImageOffset Specifies the offset, in bytes, from the beginning of the file to the icon image.Icon ImageEach icon-resource file contains one icon image for each image identified in the icon directory. An icon image consists of an icon-image header, a color table, an XOR mask, and an AND mask. The icon image has the following form:BITMAPINFOHEADER icHeader; RGBQUAD icColors[]; BYTE icXOR[]; BYTE icAND[];The icon-image header, defined as a BITMAPINFOHEADER structure, specifies the dimensions and color format of the icon bitmap. Only the biSize through biBitCount members and the biSizeImage member are used. All other members (such as biCompression and biClrImportant) must be set to zero.The color table, defined as an array of RGBQUAD structures, specifies the colors used in the XOR mask. As with the color table in a bitmap file, the biBitCount member in the icon-image header determines the number of elements in the array. For more information about the color table, see Section 1.1, "Bitmap-File Formats."The XOR mask, immediately following the color table, is an array of BYTE values representing consecutive rows of a bitmap. The bitmap defines the basic shape and color of the icon image. As with the bitmap bits in a bitmap file, the bitmap data in an icon-resource file is organized in scan lines, with each byte representing one or more pixels, as defined by the color format. For more information about these bitmap bits, see Section 1.1, "Bitmap-File Formats."The AND mask, immediately following the XOR mask, is an array of BYTE values, representing a monochrome bitmap with the same width and height as the XOR mask. The array is organized in scan lines, with each byte representing 8 pixels.When Windows draws an icon, it uses the AND and XOR masks to combine the icon image with the pixels already on the display surface. Windows first applies the AND mask by using a bitwise AND operation; this preserves or removes existing pixel color. Windows then applies the XOR mask by using a bitwise XOR operation. This sets the final color for each pixel.The following illustration shows the XOR and AND masks that create a monochrome icon (measuring 8 pixels by 8 pixels) in the form of an uppercase K:Windows Icon SelectionWindows detects the resolution of the current display and matches it against the width and height specified for each version of the icon image. If Windows determines that there is an exact match between an icon image and the current device, it uses the matching image. Otherwise, it selects the closest match and stretches the image to the proper size.If an icon-resource file contains more than one image for a particular resolution, Windows uses the icon image that most closely matches the color capabilities of the current display. If no image matches the device capabilities exactly, Windows selects the image that has the greatest number of colors without exceeding the number of display colors. If all images exceed the color capabilities of the current display, Windows uses the icon image with the least number of colors.Cursor-Resource File FormatA cursor-resource file contains image data for cursors used by Windows applications. The file consists of a cursor directory identifying the number and types of cursor images in the file, plus one or more cursor images. The default filename extension for a cursor-resource file is .CUR.Cursor DirectoryEach cursor-resource file starts with a cursor directory. The cursor directory, defined as a CURSORDIR structure, specifies the number of cursors in the file and the dimensions and color format of each cursor image. The CURSORDIR structure has the following form: typedef struct _CURSORDIR { WORD cdReserved; WORD cdType; WORD cdCount; CURSORDIRENTRY cdEntries[]; } CURSORDIR;Following are the members in the CURSORDIR structure: cdReserved Reserved; must be zero. cdType Specifies the resource type. This member must be set to 2. cdCount Specifies the number of cursors in the file. cdEntries Specifies an array of CURSORDIRENTRY structures containing information about individual cursors. The cdCount member specifies the number of structures in the array.A CURSORDIRENTRY structure specifies the dimensions and color format of a cursor image. The structure has the following form:typedef struct _CURSORDIRENTRY { BYTE bWidth; BYTE bHeight; BYTE bColorCount; BYTE bReserved; WORD wXHotspot; WORD wYHotspot; DWORD lBytesInRes; DWORD dwImageOffset; } CURSORDIRENTRY;Following are the members in the CURSORDIRENTRY structure: bWidth Specifies the width of the cursor, in pixels. bHeight Specifies the height of the cursor, in pixels. bColorCount Reserved; must be zero. bReserved Reserved; must be zero. wXHotspot Specifies the x-coordinate, in pixels, of the hot spot. wYHotspot Specifies the y-coordinate, in pixels, of the hot spot. lBytesInRes Specifies the size of the resource, in bytes. dwImageOffset Specifies the offset, in bytes, from the start of the file to the cursor image.Cursor ImageEach cursor-resource file contains one cursor image for each image identified in the cursor directory. A cursor image consists of a cursor-image header, a color table, an XOR mask, and an AND mask. The cursor image has the following form:BITMAPINFOHEADER crHeader; RGBQUAD crColors[]; BYTE crXOR[]; BYTE crAND[];The cursor hot spot is a single pixel in the cursor bitmap that Windows uses to track the cursor. The crXHotspot and crYHotspot members specify the x- and y-coordinates of the cursor hot spot. These coordinates are 16-bit integers.The cursor-image header, defined as a BITMAPINFOHEADER structure, specifies the dimensions and color format of the cursor bitmap. Only the biSize through biBitCount members and the biSizeImage member are used. The biHeight member specifies the combined height of the XOR and AND masks for the cursor. This value is twice the height of the XOR mask. The biPlanes and biBitCount members must be 1. All other members (such as biCompression and biClrImportant) must be set to zero.The color table, defined as an array of RGBQUAD structures, specifies the colors used in the XOR mask. For a cursor image, the table contains exactly two structures, since the biBitCount member in the cursor-image header is always 1.The XOR mask, immediately following the color table, is an array of BYTE values representing consecutive rows of a bitmap. The bitmap defines the basic shape and color of the cursor image. As with the bitmap bits in a bitmap file, the bitmap data in a cursor-resource file is organized in scan lines, with each byte representing one or more pixels, as defined by the color format. For more information about these bitmap bits, see Section 1.1, "Bitmap-File Formats."The AND mask, immediately following the XOR mask, is an array of BYTE values representing a monochrome bitmap with the same width and height as the XOR mask. The array is organized in scan lines, with each byte representing 8 pixels.When Windows draws a cursor, it uses the AND and XOR masks to combine the cursor image with the pixels already on the display surface. Windows first applies the AND mask by using a bitwise AND operation; this preserves or removes existing pixel color. Window then applies the XOR mask by using a bitwise XOR operation. This sets the final color for each pixel.The following illustration shows the XOR and the AND masks that create a cursor (measuring 8 pixels by 8 pixels) in the form of an arrow:Following are the bit-mask values necessary to produce black, white, inverted, and transparent results:Pixel result AND maskXOR maskBlack 0 0 White 0 1 Transparent 1 0 Inverted1 1 Windows Cursor SelectionIf a cursor-resource file contains more than one cursor image, Windows determines the best match for a particular display by examining the width and height of the cursor images. ============================================================================== BITMAPFILEHEADER (3.0)typedef struct tagBITMAPFILEHEADER { /* bmfh */ UINT bfType; DWORD bfSize; UINT bfReserved1; UINT bfReserved2; DWORD bfOffBits; } BITMAPFILEHEADER;The BITMAPFILEHEADER structure contains information about the type, size, and layout of a device-independent bitmap (DIB) file.Member DescriptionbfType Specifies the type of file. This member must be BM. bfSize Specifies the size of the file, in bytes. bfReserved1 Reserved; must be set to zero. bfReserved2 Reserved; must be set to zero. bfOffBits Specifies the byte offset from the BITMAPFILEHEADER structure to the actual bitmap data in the file.CommentsA BITMAPINFO or BITMAPCOREINFO structure immediately follows the BITMAPFILEHEADER structure in the DIB file.See AlsoBITMAPCOREINFO, BITMAPINFO ============================================================================== BITMAPINFO (3.0)typedef struct tagBITMAPINFO { /* bmi */ BITMAPINFOHEADER bmiHeader; RGBQUAD bmiColors[1]; } BITMAPINFO;The BITMAPINFO structure fully defines the dimensions and color information for a Windows 3.0 or later device-independent bitmap (DIB).Member DescriptionbmiHeader Specifies a BITMAPINFOHEADER structure that contains information about the dimensions and color format of a DIB.bmiColors Specifies an array of RGBQUAD structures that define the colors in the bitmap.CommentsA Windows 3.0 or later DIB consists of two distinct parts: a BITMAPINFO structure, which describes the dimensions and colors of the bitmap, and an array of bytes defining the pixels of the bitmap. The bits in the array are packed together, but each scan line must be zero-padded to end on a LONG boundary. Segment boundaries, however, can appear anywhere in the bitmap. The origin of the bitmap is the lower-left corner.The biBitCount member of the BITMAPINFOHEADER structure determines the number of bits which define each pixel and the maximum number of colors in the bitmap. This member may be set to any of the following values:Value Meaning1 The bitmap is monochrome, and the bmciColors member must contain two entries. Each bit in the bitmap array represents a pixel. If the bit is clear, the pixel is displayed with the color of the first entry in the bmciColors table. If the bit is set, the pixel has the color of the second entry in the table.4 The bitmap has a maximum of 16 colors, and the bmciColors member contains 16 entries. Each pixel in the bitmap is represented by a four-bit index into the color table.For example, if the first byte in the bitmap is 0x1F, the byte represents two pixels. The first pixel contains the color in the second table entry, and the second pixel contains the color in the sixteenth table entry.8 The bitmap has a maximum of 256 colors, and the bmciColors member contains 256 entries. In this case, each byte in the array represents a single pixel.24 The bitmap has a maximum of 2^24 colors. The bmciColors member is NULL, and each 3-byte sequence in the bitmap array represents the relative intensities of red, green, and blue, respectively, of a pixel.The biClrUsed member of the BITMAPINFOHEADER structure specifies the number of color indexes in the color table actually used by the bitmap. If the biClrUsed member is set to zero, the bitmap uses the maximum number of colors corresponding to the value of the biBitCount member.The colors in the bmiColors table should appear in order of importance. Alternatively, for functions that use DIBs, the bmiColors member can be an array of 16-bit unsigned integers that specify an index into the currently realized logical palette instead of explicit RGB values. In this case, an application using the bitmap must call DIB functions with the wUsage parameter set to DIB_PAL_COLORS.Note: The bmiColors member should not contain palette indexes if the bitmap is to be stored in a file or transferred to another application. Unless the application uses the bitmap exclusively and under its complete control, the bitmap color table should contain explicit RGB values.See AlsoBITMAPINFOHEADER, RGBQUAD ============================================================================== BITMAPINFOHEADER (3.0)typedef struct tagBITMAPINFOHEADER { /* bmih */ DWORD biSize; LONG biWidth; LONG biHeight; WORD biPlanes; WORD biBitCount; DWORD biCompression; DWORD biSizeImage; LONG biXPelsPerMeter; LONG biYPelsPerMeter; DWORD biClrUsed; DWORD biClrImportant; } BITMAPINFOHEADER;The BITMAPINFOHEADER structure contains information about the dimensions and color format of a Windows 3.0 or later device-independent bitmap (DIB).Member DescriptionbiSize Specifies the number of bytes required by the BITMAPINFOHEADER structure.biWidth Specifies the width of the bitmap, in pixels. biHeightSpecifies the height of the bitmap, in pixels. biPlanesSpecifies the number of planes for the target device. This member must be set to 1.biBitCount Specifies the number of bits per pixel. This value must be 1, 4, 8, or 24.biCompression Specifies the type of compression for a compressed bitmap. It can be one of the following values:Value MeaningBI_RGB Specifies that the bitmap is not compressed. BI_RLE8 Specifies a run-length encoded format for bitmaps with 8 bits per pixel. The compression format is a 2-byte format consisting of a count byte followed by a byte containing a color index. For more information, see the following Comments section.BI_RLE4 Specifies a run-length encoded format for bitmaps with 4 bits per pixel. The compression format is a 2-byte format consisting of a count byte followed by two word-length color indexes. For more information, see the following Comments section.biSizeImage Specifies the size, in bytes, of the image. It is valid to set this member to zero if the bitmap is in the BI_RGB format.biXPelsPerMeter Specifies the horizontal resolution, in pixels per meter, of the target device for the bitmap. An application can use this value to select a bitmap from a resource group that best matches the characteristics of the current device.biYPelsPerMeter Specifies the vertical resolution, in pixels per meter, of the target device for the bitmap.biClrUsed Specifies the number of color indexes in the color table actually used by the bitmap. If this value is zero, the bitmap uses the maximum number of colors corresponding to the value of the biBitCount member. For more information on the maximum sizes of the color table, see the description of the BITMAPINFO structure earlier in this topic.If the biClrUsed member is nonzero, it specifies the actual number of colors that the graphics engine or device driver will access if the biBitCount member is less than 24. If biBitCount is set to 24, biClrUsed specifies the size of the reference color table used to optimize performance of Windows color palettes. If the bitmap is a packed bitmap (that is, a bitmap in which the bitmap array immediately follows the BITMAPINFO header and which is referenced by a single pointer), the biClrUsed member must be set to zero or to the actual size of the color table.biClrImportant Specifies the number of color indexes that are considered important for displaying the bitmap. If this value is zero, all colors are important.CommentsThe BITMAPINFO structure combines the BITMAPINFOHEADER structure and a color table to provide a complete definition of the dimensions and colors of a Windows 3.0 or later DIB. For more information about specifying a Windows 3.0 DIB, see the description of the BITMAPINFO structure.An application should use the information stored in the biSize member to locate the color table in a BITMAPINFO structure as follows:pColor = ((LPSTR) pBitmapInfo + (WORD) (pBitmapInfo->bmiHeader.biSize))Windows supports formats for compressing bitmaps that define their colors with 8 bits per pixel and with 4 bits per pixel. Compression reduces the disk and memory storage required for the bitmap. The following paragraphs describe these formats.BI_RLE8When the biCompression member is set to BI_RLE8, the bitmap is compressed using a run-length encoding format for an 8-bit bitmap. This format may be compressed in either of two modes: encoded and absolute. Both modes can occur anywhere throughout a single bitmap.Encoded mode consists of two bytes: the first byte specifies the number of consecutive pixels to be drawn using the color index contained in the second byte. In addition, the first byte of the pair can be set to zero to indicate an escape that denotes an end of line, end of bitmap, or a delta. The interpretation of the escape depends on the value of the second byte of the pair. The following list shows the meaning of the second byte:Value Meaning0 End of line. 1 End of bitmap. 2 Delta. The two bytes following the escape contain unsigned values indicating the horizontal and vertical offset of the next pixel from the current position.Absolute mode is signaled by the first byte set to zero and the second byte set to a value between 0x03 and 0xFF. In absolute mode, the second byte represents the number of bytes that follow, each of which contains the color index of a single pixel. When the second byte is set to 2 or less, the escape has the same meaning as in encoded mode. In absolute mode, each run must be aligned on a word boundary. The following example shows the hexadecimal values of an 8-bit compressed bitmap:03 04 05 06 00 03 45 56 67 00 02 78 00 02 05 01 02 78 00 00 09 1E 00 01This bitmap would expand as follows (two-digit values represent a color index for a single pixel):04 04 04 06 06 06 06 06 45 56 67 78 78 move current position 5 right and 1 down 78 78 end of line 1E 1E 1E 1E 1E 1E 1E 1E 1E end of RLE bitmapBI_RLE4When the biCompression member is set to BI_RLE4, the bitmap is compressed using a run-length encoding (RLE) format for a 4-bit bitmap, which also uses encoded and absolute modes. In encoded mode, the first byte of the pair contains the number of pixels to be drawn using the color indexes in the second byte. The second byte contains two color indexes, one in its high-order nibble (that is, its low-order four bits) and one in its low-order nibble. The first of the pixels is drawn using the color specified by the high-order nibble, the second is drawn using the color in the low-order nibble, the third is drawn with the color in the high-order nibble, and so on, until all the pixels specified by the first byte have been drawn. In absolute mode, the first byte contains zero, the second byte contains the number of color indexes that follow, and subsequent bytes contain color indexes in their high- and low-order nibbles, one color index for each pixel. In absolute mode, each run must be aligned on a word boundary. The end-of-line, end-of-bitmap, and delta escapes also apply to BI_RLE4.The following example shows the hexadecimal values of a 4-bit compressed bitmap:03 04 05 06 00 06 45 56 67 00 04 78 00 02 05 01 04 78 00 00 09 1E 00 01This bitmap would expand as follows (single-digit values represent a color index for a single pixel):0 4 0 0 6 0 6 0 4 5 5 6 6 7 7 8 7 8 move current position 5 right and 1 down 7 8 7 8 end of line 1 E 1 E 1 E 1 E 1 end of RLE bitmapSee AlsoBITMAPINFO ============================================================================== RGBQUAD (3.0)typedef struct tagRGBQUAD { /* rgbq */ BYTE rgbBlue; BYTE rgbGreen; BYTE rgbRed; BYTE rgbReserved; } RGBQUAD;The RGBQUAD structure describes a color consisting of relative intensities of red, green, and blue. The bmiColors member of the BITMAPINFO structure consists of an array of RGBQUAD structures.Member DescriptionrgbBlue Specifies the intensity of blue in the color. rgbGreenSpecifies the intensity of green in the color. rgbRed Specifies the intensity of red in the color. rgbReserved Not used; must be set to zero. See AlsoBITMAPINFO ============================================================================== RGB (2.x)COLORREF RGB(cRed, cGreen, cBlue)BYTE cRed; /* red component of color */ BYTE cGreen; /* green component of color */ BYTE cBlue; /* blue component of color */ The RGB macro selects an RGB color based on the parameters supplied and the color capabilities of the output device.Parameter DescriptioncRed Specifies the intensity of the red color field. cGreen Specifies the intensity of the green color field. cBlue Specifies the intensity of the blue color field. ReturnsThe return value specifies the resultant RGB color. CommentsThe intensity for each argument can range from 0 through 255. If all three intensities are specified as zero, the result is black. If all three intensities are specified as 255, the result is white.CommentsThe RGB macro is defined in WINDOWS.H as follows: #define RGB(r,g,b) ((COLORREF)(((BYTE)(r)|((WORD)(g)<<8))| (((DWORD)(BYTE)(b))<<16)))See AlsoGetBValue, GetGValue, GetRValue, PALETTEINDEX, PALETTERGB============================================================================== BITMAPCOREINFO (3.0)typedef struct tagBITMAPCOREINFO { /* bmci */ BITMAPCOREHEADER bmciHeader; RGBTRIPLE bmciColors[1]; } BITMAPCOREINFO;The BITMAPCOREINFO structure fully defines the dimensions and color information for a device-independent bitmap (DIB). Windows applications should use the BITMAPINFO structure instead of BITMAPCOREINFO whenever possible.Member DescriptionbmciHeader Specifies a BITMAPCOREHEADER structure that contains information about the dimensions and color format of a DIB.bmciColors Specifies an array of RGBTRIPLE structures that define the colors in the bitmap.CommentsThe BITMAPCOREINFO structure describes the dimensions and colors of a bitmap. It is followed immediately in memory by an array of bytes which define the pixels of the bitmap. The bits in the array are packed together, but each scan line must be zero-padded to end on a LONG boundary. Segment boundaries, however, can appear anywhere in the bitmap. The origin of the bitmap is the lower-left corner.The bcBitCount member of the BITMAPCOREHEADER structure determines the number of bits that define each pixel and the maximum number of colors in the bitmap. This member may be set to any of the following values:Value Meaning1 The bitmap is monochrome, and the bmciColors member must contain two entries. Each bit in the bitmap array represents a pixel. If the bit is clear, the pixel is displayed with the color of the first entry in the bmciColors table. If the bit is set, the pixel has the color of the second entry in the table.4 The bitmap has a maximum of 16 colors, and the bmciColors member contains 16 entries. Each pixel in the bitmap is represented by a four-bit index into the color table.For example, if the first byte in the bitmap is 0x1F, the byte represents two pixels. The first pixel contains the color in the second table entry, and the second pixel contains the color in the sixteenth table entry.8 The bitmap has a maximum of 256 colors, and the bmciColors member contains 256 entries. In this case, each byte in the array represents a single pixel.24 The bitmap has a maximum of 2^24 colors. The bmciColors member is NULL, and each 3-byte sequence in the bitmap array represents the relative intensities of red, green, and blue, respectively, of a pixel.The colors in the bmciColors table should appear in order of importance. Alternatively, for functions that use DIBs, the bmciColors member can be an array of 16-bit unsigned integers that specify an index into the currently realized logical palette instead of explicit RGB values. In this case, an application using the bitmap must call DIB functions with the wUsage parameter set to DIB_PAL_COLORS.Note: The bmciColors member should not contain palette indexes if the bitmap is to be stored in a file or transferred to another application. Unless the application uses the bitmap exclusively and under its complete control, the bitmap color table should contain explicit RGB values.See AlsoBITMAPINFO, BITMAPCOREHEADER, RGBTRIPLE ============================================================================== BITMAPCOREHEADER (3.0)typedef struct tagBITMAPCOREHEADER { /* bmch */ DWORD bcSize; short bcWidth; short bcHeight; WORD bcPlanes; WORD bcBitCount; } BITMAPCOREHEADER;The BITMAPCOREHEADER structure contains information about the dimensions and color format of a device-independent bitmap (DIB). Windows applications should use the BITMAPINFOHEADER structure instead of BITMAPCOREHEADER whenever possible.Member DescriptionbcSize Specifies the number of bytes required by the BITMAPCOREHEADER structure.bcWidth Specifies the width of the bitmap, in pixels. bcHeightSpecifies the height of the bitmap, in pixels. bcPlanesSpecifies the number of planes for the target device. This member must be set to 1.bcBitCount Specifies the number of bits per pixel. This value must be 1, 4, 8, or 24.CommentsThe BITMAPCOREINFO structure combines the BITMAPCOREHEADER structure and a color table to provide a complete definition of the dimensions and colors of a DIB. See the description of the BITMAPCOREINFO structure for more information about specifying a DIB.An application should use the information stored in the bcSize member to locate the color table in a BITMAPCOREINFO structure with a method such as the following:lpColor = ((LPSTR) pBitmapCoreInfo + (UINT) (pBitmapCoreInfo->bcSize))See AlsoBITMAPCOREINFO, BITMAPINFOHEADER, BITMAPINFOHEADER ============================================================================= RGBTRIPLE (3.0)typedef struct tagRGBTRIPLE { /* rgbt */ BYTE rgbtBlue; BYTE rgbtGreen; BYTE rgbtRed; } RGBTRIPLE;The RGBTRIPLE structure describes a color consisting of relative intensities of red, green, and blue. The bmciColors member of the BITMAPCOREINFO structure consists of an array of RGBTRIPLE structures. Windows applications should use the BITMAPINFO structure instead of BITMAPCOREINFO whenever possible. The BITMAPINFO structure uses an RGBQUAD structure instead of the RGBTRIPLE structure.Member DescriptionrgbtBlueSpecifies the intensity of blue in the color. rgbtGreen Specifies the intensity of green in the color. rgbtRed Specifies the intensity of red in the color.See AlsoBITMAPCOREINFO, BITMAPINFO, RGBQUAD==============================================================================
颜色数一定得256色
大小也得同logo.sys一样，你可以在photoshop里看看图片大小
如果保存后的bmp文件大小为127k那就行了
bfType As Integer
bfSize As Long
bfReserved1 As Integer
bfReserved2 As Integer
bfOffBits As Long
End TypePrivate Type BITMAPINFOHEADER '40 bytes
biSize As Long
biWidth As Long
biHeight As Long
biPlanes As Integer
biBitCount As Integer
biCompression As Long
biSizeImage As Long
biXPelsPerMeter As Long
biYPelsPerMeter As Long
biClrUsed As Long
biClrImportant As Long
End TypePrivate Type RGBQUAD
rgbBlue As Byte
rgbGreen As Byte
rgbRed As Byte
rgbFlags As Byte
End Type顺着读BITMAPFILEHEADER跟BITMAPINFOHEADER，如果是8位的则定义一个256个元素的COLOR ARRAY为RGBQUAD，否则没有颜色表，然后剩下的就是构成图象的字节了，如果是256色的话，一个字节就是一个颜色表里面的索引，否则的话就是直接的图象数据了，16位就是2个字节为一个点，分为555和565方式，24位就是3个字节一个点，32位就是4个字节一个点，其中三个为RGB，一个为ALPHA通道的FLAG值，注意颜色字节的顺序是BGR存放的，不要取倒了。另外，位图数据的编码开始位置也有两种，一种是从左上开始，一种是从左下开始的，第二种的比较少见。位图的数据还有可能是压缩的，需要靠INFOHEADER里面的biCompression标志来判断，如果是压缩的，则压缩方式为单行RLE方式，请参阅相关文件。4位、2位和1位的位图文件这里就不讨论了，因为需要涉及到位面，比较麻烦，应用也不多。
开机的logo.sys是256色的 有颜色表 但是好象8个字节代表一个象素
另外它的循环控制在什么位置？ 有的资料说是在第32字节 但是我试过了 还是有出入
不知道有没有人知道？
还有它是如何具体控制的啊？？？？？？？？？？？？？？
我是要在windows环境下得到开机画面的动态效果！！！
有谁能帮我啊 问题解决后 马上给分！！！！
的logo.sys居然都没有颜色表,真是让人诧异!!!!!!!
有谁明白啊!!!!!!!!!!!!!!!!!!!!!!!!!!!
operating system. Graphics files include bitmap files, icon-resource files,
and cursor-resource files.Bitmap-File FormatsWindows bitmap files are stored in a device-independent bitmap (DIB) format
that allows Windows to display the bitmap on any type of display device. The
term "device independent" means that the bitmap specifies pixel color in a
form independent of the method used by a display to represent color. The
default filename extension of a Windows DIB file is .BMP.Bitmap-File StructuresEach bitmap file contains a bitmap-file header, a bitmap-information header,
a color table, and an array of bytes that defines the bitmap bits. The file
has the following form:BITMAPFILEHEADER bmfh;
BITMAPINFOHEADER bmih;
RGBQUAD aColors[];
BYTE aBitmapBits[];The bitmap-file header contains information about the type, size, and layout
of a device-independent bitmap file. The header is defined as a
BITMAPFILEHEADER structure.The bitmap-information header, defined as a BITMAPINFOHEADER structure,
specifies the dimensions, compression type, and color format for the bitmap.The color table, defined as an array of RGBQUAD structures, contains as many
elements as there are colors in the bitmap. The color table is not present
for bitmaps with 24 color bits because each pixel is represented by 24-bit
red-green-blue (RGB) values in the actual bitmap data area. The colors in the
table should appear in order of importance. This helps a display driver
render a bitmap on a device that cannot display as many colors as there are
in the bitmap. If the DIB is in Windows version 3.0 or later format, the
driver can use the biClrImportant member of the BITMAPINFOHEADER structure to
determine which colors are important.The BITMAPINFO structure can be used to represent a combined
bitmap-information header and color table. The bitmap bits, immediately
following the color table, consist of an array of BYTE values representing
consecutive rows, or "scan lines," of the bitmap. Each scan line consists of
consecutive bytes representing the pixels in the scan line, in left-to-right
order. The number of bytes representing a scan line depends on the color
format and the width, in pixels, of the bitmap. If necessary, a scan line
must be zero-padded to end on a 32-bit boundary. However, segment boundaries
can appear anywhere in the bitmap. The scan lines in the bitmap are stored
from bottom up. This means that the first byte in the array represents the
pixels in the lower-left corner of the bitmap and the last byte represents
the pixels in the upper-right corner.The biBitCount member of the BITMAPINFOHEADER structure determines the number
of bits that define each pixel and the maximum number of colors in the
bitmap. These members can have any of the following values:Value Meaning1 Bitmap is monochrome and the color table contains two entries. Each
bit in the bitmap array represents a pixel. If the bit is clear, the pixel is
displayed with the color of the first entry in the color table. If the bit is
set, the pixel has the color of the second entry in the table.4 Bitmap has a maximum of 16 colors. Each pixel in the bitmap is
represented by a 4-bit index into the color table. For example, if the first
byte in the bitmap is 0x1F, the byte represents two pixels. The first pixel
contains the color in the second table entry, and the second pixel contains
the color in the sixteenth table entry.8 Bitmap has a maximum of 256 colors. Each pixel in the bitmap is
represented by a 1-byte index into the color table. For example, if the first
byte in the bitmap is 0x1F, the first pixel has the color of the
thirty-second table entry.24 Bitmap has a maximum of 2^24 colors. The bmiColors (or bmciColors)
member is NULL, and each 3-byte sequence in the bitmap array represents the
relative intensities of red, green, and blue, respectively, for a pixel.The biClrUsed member of the BITMAPINFOHEADER structure specifies the number
of color indexes in the color table actually used by the bitmap. If the
biClrUsed member is set to zero, the bitmap uses the maximum number of colors
corresponding to the value of the biBitCount member. An alternative form of
bitmap file uses the BITMAPCOREINFO, BITMAPCOREHEADER, and RGBTRIPLE
structures.Bitmap CompressionWindows versions 3.0 and later support run-length encoded (RLE) formats for
compressing bitmaps that use 4 bits per pixel and 8 bits per pixel.
Compression reduces the disk and memory storage required for a bitmap.Compression of 8-Bits-per-Pixel BitmapsWhen the biCompression member of the BITMAPINFOHEADER structure is set to
BI_RLE8, the DIB is compressed using a run-length encoded format for a
256-color bitmap. This format uses two modes: encoded mode and absolute mode.
Both modes can occur anywhere throughout a single bitmap.Encoded ModeA unit of information in encoded mode consists of two bytes. The first byte
specifies the number of consecutive pixels to be drawn using the color index
contained in the second byte. The first byte of the pair can be set to zero
to indicate an escape that denotes the end of a line, the end of the bitmap,
or a delta. The interpretation of the escape depends on the value of the
second byte of the pair, which must be in the range 0x00 through 0x02.
Following are the meanings of the escape values that can be used in the
second byte:Second byte Meaning0 End of line.
1 End of bitmap.
2 Delta. The two bytes following the escape contain unsigned values
indicating the horizontal and vertical offsets of the next pixel from the
current position.Absolute ModeAbsolute mode is signaled by the first byte in the pair being set to zero and
the second byte to a value between 0x03 and 0xFF. The second byte represents
the number of bytes that follow, each of which contains the color index of a
single pixel. Each run must be aligned on a word boundary. Following is an
example of an 8-bit RLE bitmap (the two-digit hexadecimal values in the
second column represent a color index for a single pixel):Compressed data Expanded data03 04 04 04 04
05 06 06 06 06 06 06
00 03 45 56 67 00 45 56 67
02 78 78 78
00 02 05 01 Move 5 right and 1 down
02 78 78 78
00 00 End of line
09 1E 1E 1E 1E 1E 1E 1E 1E 1E 1E
00 01 End of RLE bitmap Compression of 4-Bits-per-Pixel BitmapsWhen the biCompression member of the BITMAPINFOHEADER structure is set to
BI_RLE4, the DIB is compressed using a run-length encoded format for a
16-color bitmap. This format uses two modes: encoded mode and absolute mode.Encoded ModeA unit of information in encoded mode consists of two bytes. The first byte
of the pair contains the number of pixels to be drawn using the color indexes
in the second byte.The second byte contains two color indexes, one in its high-order nibble
(that is, its low-order 4 bits) and one in its low-order nibble.The first pixel is drawn using the color specified by the high-order nibble,
the second is drawn using the color in the low-order nibble, the third is
drawn with the color in the high-order nibble, and so on, until all the
pixels specified by the first byte have been drawn.The first byte of the pair can be set to zero to indicate an escape that
denotes the end of a line, the end of the bitmap, or a delta. The
interpretation of the escape depends on the value of the second byte of the
pair. In encoded mode, the second byte has a value in the range 0x00 through
0x02. The meaning of these values is the same as for a DIB with 8 bits per
pixel.Absolute ModeIn absolute mode, the first byte contains zero, the second byte contains the
number of color indexes that follow, and subsequent bytes contain color
indexes in their high- and low-order nibbles, one color index for each pixel.
Each run must be aligned on a word boundary.Following is an example of a 4-bit RLE bitmap (the one-digit hexadecimal
values in the second column represent a color index for a single pixel):Compressed data Expanded data03 04 0 4 0
05 06 0 6 0 6 0
00 06 45 56 67 00 4 5 5 6 6 7
04 78 7 8 7 8
00 02 05 01 Move 5 right and 1 down
04 78 7 8 7 8
00 00 End of line
09 1E 1 E 1 E 1 E 1 E 1
00 01 End of RLE bitmap Bitmap ExampleThe following example is a text dump of a 16-color bitmap (4 bits per pixel):Win3DIBFile
BitmapFileHeader
Type 19778
Size 3118
Reserved1 0
Reserved2 0
OffsetBits 118
BitmapInfoHeader
Size 40
Width 80
Height 75
Planes 1
BitCount 4
Compression 0
SizeImage 3000 XPelsPerMeter 0
YPelsPerMeter 0
ColorsUsed 16
ColorsImportant 16
Win3ColorTable
Blue Green Red Unused
[00000000] 84 252 84 0
[00000001] 252 252 84 0
[00000002] 84 84 252 0
[00000003] 252 84 252 0
[00000004] 84 252 252 0
[00000005] 252 252 252 0
[00000006] 0 0 0 0
[00000007] 168 0 0 0
[00000008] 0 168 0 0
[00000009] 168 168 0 0
[0000000A] 0 0 168 0
[0000000B] 168 0 168 0
[0000000C] 0 168 168 0
[0000000D] 168 168 168 0
[0000000E] 84 84 84 0
[0000000F] 252 84 84 0
Image
.
. Bitmap data
.Icon-Resource File FormatAn icon-resource file contains image data for icons used by Windows
applications. The file consists of an icon directory identifying the number
and types of icon images in the file, plus one or more icon images. The
default filename extension for an icon-resource file is .ICO.Icon DirectoryEach icon-resource file starts with an icon directory. The icon directory,
defined as an ICONDIR structure, specifies the number of icons in the
resource and the dimensions and color format of each icon image. The ICONDIR
structure has the following form:typedef struct ICONDIR {
WORD idReserved;
WORD idType;
WORD idCount;
ICONDIRENTRY idEntries[1];
} ICONHEADER;Following are the members in the ICONDIR structure:idReserved Reserved; must be zero.
idType Specifies the resource type. This member is set to 1.
idCount Specifies the number of entries in the directory.
idEntries Specifies an array of ICONDIRENTRY structures containing
information about individual icons. The idCount member specifies the number
of structures in the array.The ICONDIRENTRY structure specifies the dimensions and color format for an
icon. The structure has the following form:struct IconDirectoryEntry {
BYTE bWidth;
BYTE bHeight;
BYTE bColorCount;
BYTE bReserved;
WORD wPlanes;
WORD wBitCount;
DWORD dwBytesInRes;
DWORD dwImageOffset;
};Following are the members in the ICONDIRENTRY structure: bWidth Specifies the width of the icon, in pixels. Acceptable values
are 16, 32, and 64.bHeight Specifies the height of the icon, in pixels. Acceptable
values are 16, 32, and 64.bColorCount Specifies the number of colors in the icon. Acceptable values
are 2, 8, and 16.bReserved Reserved; must be zero.
wPlanes Specifies the number of color planes in the icon bitmap.
wBitCount Specifies the number of bits in the icon bitmap.
dwBytesInRes Specifies the size of the resource, in bytes.
dwImageOffset Specifies the offset, in bytes, from the beginning of the
file to the icon image.Icon ImageEach icon-resource file contains one icon image for each image identified in
the icon directory. An icon image consists of an icon-image header, a color
table, an XOR mask, and an AND mask. The icon image has the following form:BITMAPINFOHEADER icHeader;
RGBQUAD icColors[];
BYTE icXOR[];
BYTE icAND[];The icon-image header, defined as a BITMAPINFOHEADER structure, specifies the
dimensions and color format of the icon bitmap. Only the biSize through
biBitCount members and the biSizeImage member are used. All other members
(such as biCompression and biClrImportant) must be set to zero.The color table, defined as an array of RGBQUAD structures, specifies the
colors used in the XOR mask. As with the color table in a bitmap file, the
biBitCount member in the icon-image header determines the number of elements
in the array. For more information about the color table, see Section 1.1,
"Bitmap-File Formats."The XOR mask, immediately following the color table, is an array of BYTE
values representing consecutive rows of a bitmap. The bitmap defines the
basic shape and color of the icon image. As with the bitmap bits in a bitmap
file, the bitmap data in an icon-resource file is organized in scan lines,
with each byte representing one or more pixels, as defined by the color
format. For more information about these bitmap bits, see Section 1.1,
"Bitmap-File Formats."The AND mask, immediately following the XOR mask, is an array of BYTE values,
representing a monochrome bitmap with the same width and height as the XOR
mask. The array is organized in scan lines, with each byte representing 8
pixels.When Windows draws an icon, it uses the AND and XOR masks to combine the icon
image with the pixels already on the display surface. Windows first applies
the AND mask by using a bitwise AND operation; this preserves or removes
existing pixel color. Windows then applies the XOR mask by using a bitwise
XOR operation. This sets the final color for each pixel.The following illustration shows the XOR and AND masks that create a
monochrome icon (measuring 8 pixels by 8 pixels) in the form of an uppercase
K:Windows Icon SelectionWindows detects the resolution of the current display and matches it against
the width and height specified for each version of the icon image. If Windows
determines that there is an exact match between an icon image and the current
device, it uses the matching image. Otherwise, it selects the closest match
and stretches the image to the proper size.If an icon-resource file contains more than one image for a particular
resolution, Windows uses the icon image that most closely matches the color
capabilities of the current display. If no image matches the device
capabilities exactly, Windows selects the image that has the greatest number
of colors without exceeding the number of display colors. If all images
exceed the color capabilities of the current display, Windows uses the icon
image with the least number of colors.Cursor-Resource File FormatA cursor-resource file contains image data for cursors used by Windows
applications. The file consists of a cursor directory identifying the number
and types of cursor images in the file, plus one or more cursor images. The
default filename extension for a cursor-resource file is .CUR.Cursor DirectoryEach cursor-resource file starts with a cursor directory. The cursor
directory, defined as a CURSORDIR structure, specifies the number of cursors
in the file and the dimensions and color format of each cursor image. The
CURSORDIR structure has the following form:
typedef struct _CURSORDIR {
WORD cdReserved;
WORD cdType;
WORD cdCount;
CURSORDIRENTRY cdEntries[];
} CURSORDIR;Following are the members in the CURSORDIR structure: cdReserved Reserved; must be zero.
cdType Specifies the resource type. This member must be set to 2.
cdCount Specifies the number of cursors in the file.
cdEntries Specifies an array of CURSORDIRENTRY structures containing
information about individual cursors. The cdCount member specifies the number
of structures in the array.A CURSORDIRENTRY structure specifies the dimensions and color format of a
cursor image. The structure has the following form:typedef struct _CURSORDIRENTRY {
BYTE bWidth;
BYTE bHeight;
BYTE bColorCount;
BYTE bReserved;
WORD wXHotspot;
WORD wYHotspot;
DWORD lBytesInRes;
DWORD dwImageOffset;
} CURSORDIRENTRY;Following are the members in the CURSORDIRENTRY structure: bWidth Specifies the width of the cursor, in pixels.
bHeight Specifies the height of the cursor, in pixels.
bColorCount Reserved; must be zero.
bReserved Reserved; must be zero.
wXHotspot Specifies the x-coordinate, in pixels, of the hot spot.
wYHotspot Specifies the y-coordinate, in pixels, of the hot spot.
lBytesInRes Specifies the size of the resource, in bytes.
dwImageOffset Specifies the offset, in bytes, from the start of the file to
the cursor image.Cursor ImageEach cursor-resource file contains one cursor image for each image identified
in the cursor directory. A cursor image consists of a cursor-image header, a
color table, an XOR mask, and an AND mask. The cursor image has the following
form:BITMAPINFOHEADER crHeader;
RGBQUAD crColors[];
BYTE crXOR[];
BYTE crAND[];The cursor hot spot is a single pixel in the cursor bitmap that Windows uses
to track the cursor. The crXHotspot and crYHotspot members specify the x- and
y-coordinates of the cursor hot spot. These coordinates are 16-bit integers.The cursor-image header, defined as a BITMAPINFOHEADER structure, specifies
the dimensions and color format of the cursor bitmap. Only the biSize through
biBitCount members and the biSizeImage member are used. The biHeight member
specifies the combined height of the XOR and AND masks for the cursor. This
value is twice the height of the XOR mask. The biPlanes and biBitCount
members must be 1. All other members (such as biCompression and
biClrImportant) must be set to zero.The color table, defined as an array of RGBQUAD structures, specifies the
colors used in the XOR mask. For a cursor image, the table contains exactly
two structures, since the biBitCount member in the cursor-image header is
always 1.The XOR mask, immediately following the color table, is an array of BYTE
values representing consecutive rows of a bitmap. The bitmap defines the
basic shape and color of the cursor image. As with the bitmap bits in a
bitmap file, the bitmap data in a cursor-resource file is organized in scan
lines, with each byte representing one or more pixels, as defined by the
color format. For more information about these bitmap bits, see Section 1.1,
"Bitmap-File Formats."The AND mask, immediately following the XOR mask, is an array of BYTE values
representing a monochrome bitmap with the same width and height as the XOR
mask. The array is organized in scan lines, with each byte representing 8
pixels.When Windows draws a cursor, it uses the AND and XOR masks to combine the
cursor image with the pixels already on the display surface. Windows first
applies the AND mask by using a bitwise AND operation; this preserves or
removes existing pixel color. Window then applies the XOR mask by using a
bitwise XOR operation. This sets the final color for each pixel.The following illustration shows the XOR and the AND masks that create a
cursor (measuring 8 pixels by 8 pixels) in the form of an arrow:Following are the bit-mask values necessary to produce black, white,
inverted, and transparent results:Pixel result AND maskXOR maskBlack 0 0
White 0 1
Transparent 1 0
Inverted1 1 Windows Cursor SelectionIf a cursor-resource file contains more than one cursor image, Windows
determines the best match for a particular display by examining the width and
height of the cursor images.
==============================================================================
BITMAPFILEHEADER (3.0)typedef struct tagBITMAPFILEHEADER { /* bmfh */
UINT bfType;
DWORD bfSize;
UINT bfReserved1;
UINT bfReserved2;
DWORD bfOffBits;
} BITMAPFILEHEADER;The BITMAPFILEHEADER structure contains information about the type, size, and
layout of a device-independent bitmap (DIB) file.Member DescriptionbfType Specifies the type of file. This member must be BM.
bfSize Specifies the size of the file, in bytes.
bfReserved1 Reserved; must be set to zero.
bfReserved2 Reserved; must be set to zero.
bfOffBits Specifies the byte offset from the BITMAPFILEHEADER structure
to the actual bitmap data in the file.CommentsA BITMAPINFO or BITMAPCOREINFO structure immediately follows the
BITMAPFILEHEADER structure in the DIB file.See AlsoBITMAPCOREINFO, BITMAPINFO
==============================================================================
BITMAPINFO (3.0)typedef struct tagBITMAPINFO { /* bmi */
BITMAPINFOHEADER bmiHeader;
RGBQUAD bmiColors[1];
} BITMAPINFO;The BITMAPINFO structure fully defines the dimensions and color information
for a Windows 3.0 or later device-independent bitmap (DIB).Member DescriptionbmiHeader Specifies a BITMAPINFOHEADER structure that contains
information about the dimensions and color format of a DIB.bmiColors Specifies an array of RGBQUAD structures that define the
colors in the bitmap.CommentsA Windows 3.0 or later DIB consists of two distinct parts: a BITMAPINFO
structure, which describes the dimensions and colors of the bitmap, and an
array of bytes defining the pixels of the bitmap. The bits in the array are
packed together, but each scan line must be zero-padded to end on a LONG
boundary. Segment boundaries, however, can appear anywhere in the bitmap. The
origin of the bitmap is the lower-left corner.The biBitCount member of the BITMAPINFOHEADER structure determines the number
of bits which define each pixel and the maximum number of colors in the
bitmap. This member may be set to any of the following values:Value Meaning1 The bitmap is monochrome, and the bmciColors member must contain two
entries. Each bit in the bitmap array represents a pixel. If the bit is
clear, the pixel is displayed with the color of the first entry in the
bmciColors table. If the bit is set, the pixel has the color of the second
entry in the table.4 The bitmap has a maximum of 16 colors, and the bmciColors member
contains 16 entries. Each pixel in the bitmap is represented by a four-bit
index into the color table.For example, if the first byte in the bitmap is 0x1F, the byte represents two
pixels. The first pixel contains the color in the second table entry, and the
second pixel contains the color in the sixteenth table entry.8 The bitmap has a maximum of 256 colors, and the bmciColors member
contains 256 entries. In this case, each byte in the array represents a
single pixel.24 The bitmap has a maximum of 2^24 colors. The bmciColors member is
NULL, and each 3-byte sequence in the bitmap array represents the relative
intensities of red, green, and blue, respectively, of a pixel.The biClrUsed member of the BITMAPINFOHEADER structure specifies the number
of color indexes in the color table actually used by the bitmap. If the
biClrUsed member is set to zero, the bitmap uses the maximum number of colors
corresponding to the value of the biBitCount member.The colors in the bmiColors table should appear in order of importance.
Alternatively, for functions that use DIBs, the bmiColors member can be an
array of 16-bit unsigned integers that specify an index into the currently
realized logical palette instead of explicit RGB values. In this case, an
application using the bitmap must call DIB functions with the wUsage
parameter set to DIB_PAL_COLORS.Note: The bmiColors member should not contain palette indexes if the bitmap
is to be stored in a file or transferred to another application. Unless the
application uses the bitmap exclusively and under its complete control, the
bitmap color table should contain explicit RGB values.See AlsoBITMAPINFOHEADER, RGBQUAD ==============================================================================
BITMAPINFOHEADER (3.0)typedef struct tagBITMAPINFOHEADER { /* bmih */
DWORD biSize;
LONG biWidth;
LONG biHeight;
WORD biPlanes;
WORD biBitCount;
DWORD biCompression;
DWORD biSizeImage;
LONG biXPelsPerMeter;
LONG biYPelsPerMeter;
DWORD biClrUsed;
DWORD biClrImportant;
} BITMAPINFOHEADER;The BITMAPINFOHEADER structure contains information about the dimensions and
color format of a Windows 3.0 or later device-independent bitmap (DIB).Member DescriptionbiSize Specifies the number of bytes required by the
BITMAPINFOHEADER structure.biWidth Specifies the width of the bitmap, in pixels.
biHeightSpecifies the height of the bitmap, in pixels. biPlanesSpecifies the number of planes for the target device. This
member must be set to 1.biBitCount Specifies the number of bits per pixel. This value must be 1,
4, 8, or 24.biCompression Specifies the type of compression for a compressed bitmap. It
can be one of the following values:Value MeaningBI_RGB Specifies that the bitmap is not compressed. BI_RLE8 Specifies a run-length encoded format for bitmaps with 8 bits
per pixel. The compression format is a 2-byte format consisting of a count
byte followed by a byte containing a color index. For more information, see
the following Comments section.BI_RLE4 Specifies a run-length encoded format for bitmaps with 4 bits
per pixel. The compression format is a 2-byte format consisting of a count
byte followed by two word-length color indexes. For more information, see
the following Comments section.biSizeImage Specifies the size, in bytes, of the image. It is valid to
set this member to zero if the bitmap is in the BI_RGB format.biXPelsPerMeter Specifies the horizontal resolution, in pixels per meter, of
the target device for the bitmap. An application can use this value to select
a bitmap from a resource group that best matches the characteristics of the
current device.biYPelsPerMeter Specifies the vertical resolution, in pixels per meter, of
the target device for the bitmap.biClrUsed Specifies the number of color indexes in the color table
actually used by the bitmap. If this value is zero, the bitmap uses the
maximum number of colors corresponding to the value of the biBitCount member.
For more information on the maximum sizes of the color table, see the
description of the BITMAPINFO structure earlier in this topic.If the biClrUsed member is nonzero, it specifies the actual number of colors
that the graphics engine or device driver will access if the biBitCount
member is less than 24. If biBitCount is set to 24, biClrUsed specifies the
size of the reference color table used to optimize performance of Windows
color palettes. If the bitmap is a packed bitmap (that is, a bitmap in which
the bitmap array immediately follows the BITMAPINFO header and which is
referenced by a single pointer), the biClrUsed member must be set to zero or
to the actual size of the color table.biClrImportant Specifies the number of color indexes that are considered
important for displaying the bitmap. If this value is zero, all colors are
important.CommentsThe BITMAPINFO structure combines the BITMAPINFOHEADER structure and a color
table to provide a complete definition of the dimensions and colors of a
Windows 3.0 or later DIB. For more information about specifying a Windows 3.0
DIB, see the description of the BITMAPINFO structure.An application should use the information stored in the biSize member to
locate the color table in a BITMAPINFO structure as follows:pColor = ((LPSTR) pBitmapInfo + (WORD) (pBitmapInfo->bmiHeader.biSize))Windows supports formats for compressing bitmaps that define their colors
with 8 bits per pixel and with 4 bits per pixel. Compression reduces the disk
and memory storage required for the bitmap. The following paragraphs describe
these formats.BI_RLE8When the biCompression member is set to BI_RLE8, the bitmap is compressed
using a run-length encoding format for an 8-bit bitmap. This format may be
compressed in either of two modes: encoded and absolute. Both modes can occur
anywhere throughout a single bitmap.Encoded mode consists of two bytes: the first byte specifies the number of
consecutive pixels to be drawn using the color index contained in the second
byte. In addition, the first byte of the pair can be set to zero to indicate
an escape that denotes an end of line, end of bitmap, or a delta. The
interpretation of the escape depends on the value of the second byte of the
pair. The following list shows the meaning of the second byte:Value Meaning0 End of line.
1 End of bitmap.
2 Delta. The two bytes following the escape contain unsigned values
indicating the horizontal and vertical offset of the next pixel from the
current position.Absolute mode is signaled by the first byte set to zero and the second byte
set to a value between 0x03 and 0xFF. In absolute mode, the second byte
represents the number of bytes that follow, each of which contains the color
index of a single pixel. When the second byte is set to 2 or less, the escape
has the same meaning as in encoded mode. In absolute mode, each run must be
aligned on a word boundary. The following example shows the hexadecimal
values of an 8-bit compressed bitmap:03 04 05 06 00 03 45 56 67 00 02 78 00 02 05 01
02 78 00 00 09 1E 00 01This bitmap would expand as follows (two-digit values represent a color index
for a single pixel):04 04 04
06 06 06 06 06
45 56 67
78 78
move current position 5 right and 1 down
78 78
end of line
1E 1E 1E 1E 1E 1E 1E 1E 1E
end of RLE bitmapBI_RLE4When the biCompression member is set to BI_RLE4, the bitmap is compressed
using a run-length encoding (RLE) format for a 4-bit bitmap, which also uses
encoded and absolute modes. In encoded mode, the first byte of the pair
contains the number of pixels to be drawn using the color indexes in the
second byte. The second byte contains two color indexes, one in its
high-order nibble (that is, its low-order four bits) and one in its low-order
nibble. The first of the pixels is drawn using the color specified by the
high-order nibble, the second is drawn using the color in the low-order
nibble, the third is drawn with the color in the high-order nibble, and so
on, until all the pixels specified by the first byte have been drawn. In
absolute mode, the first byte contains zero, the second byte contains the
number of color indexes that follow, and subsequent bytes contain color
indexes in their high- and low-order nibbles, one color index for each pixel.
In absolute mode, each run must be aligned on a word boundary. The
end-of-line, end-of-bitmap, and delta escapes also apply to BI_RLE4.The following example shows the hexadecimal values of a 4-bit compressed
bitmap:03 04 05 06 00 06 45 56 67 00 04 78 00 02 05 01
04 78 00 00 09 1E 00 01This bitmap would expand as follows (single-digit values represent a color
index for a single pixel):0 4 0
0 6 0 6 0
4 5 5 6 6 7
7 8 7 8
move current position 5 right and 1 down
7 8 7 8
end of line
1 E 1 E 1 E 1 E 1
end of RLE bitmapSee AlsoBITMAPINFO ==============================================================================
RGBQUAD (3.0)typedef struct tagRGBQUAD { /* rgbq */
BYTE rgbBlue;
BYTE rgbGreen;
BYTE rgbRed;
BYTE rgbReserved;
} RGBQUAD;The RGBQUAD structure describes a color consisting of relative intensities of
red, green, and blue. The bmiColors member of the BITMAPINFO structure
consists of an array of RGBQUAD structures.Member DescriptionrgbBlue Specifies the intensity of blue in the color.
rgbGreenSpecifies the intensity of green in the color.
rgbRed Specifies the intensity of red in the color.
rgbReserved Not used; must be set to zero. See AlsoBITMAPINFO ==============================================================================
RGB (2.x)COLORREF RGB(cRed, cGreen, cBlue)BYTE cRed; /* red component of color */
BYTE cGreen; /* green component of color */
BYTE cBlue; /* blue component of color */
The RGB macro selects an RGB color based on the parameters supplied and the
color capabilities of the output device.Parameter DescriptioncRed Specifies the intensity of the red color field.
cGreen Specifies the intensity of the green color field.
cBlue Specifies the intensity of the blue color field. ReturnsThe return value specifies the resultant RGB color. CommentsThe intensity for each argument can range from 0 through 255. If all three
intensities are specified as zero, the result is black. If all three
intensities are specified as 255, the result is white.CommentsThe RGB macro is defined in WINDOWS.H as follows: #define RGB(r,g,b) ((COLORREF)(((BYTE)(r)|((WORD)(g)<<8))| (((DWORD)(BYTE)(b))<<16)))See AlsoGetBValue, GetGValue, GetRValue, PALETTEINDEX, PALETTERGB==============================================================================
BITMAPCOREINFO (3.0)typedef struct tagBITMAPCOREINFO { /* bmci */
BITMAPCOREHEADER bmciHeader;
RGBTRIPLE bmciColors[1];
} BITMAPCOREINFO;The BITMAPCOREINFO structure fully defines the dimensions and color
information for a device-independent bitmap (DIB). Windows applications
should use the BITMAPINFO structure instead of BITMAPCOREINFO whenever
possible.Member DescriptionbmciHeader Specifies a BITMAPCOREHEADER structure that contains
information about the dimensions and color format of a DIB.bmciColors Specifies an array of RGBTRIPLE structures that define the
colors in the bitmap.CommentsThe BITMAPCOREINFO structure describes the dimensions and colors of a bitmap.
It is followed immediately in memory by an array of bytes which define the
pixels of the bitmap. The bits in the array are packed together, but each
scan line must be zero-padded to end on a LONG boundary. Segment boundaries,
however, can appear anywhere in the bitmap. The origin of the bitmap is the
lower-left corner.The bcBitCount member of the BITMAPCOREHEADER structure determines the number
of bits that define each pixel and the maximum number of colors in the
bitmap. This member may be set to any of the following values:Value Meaning1 The bitmap is monochrome, and the bmciColors member must contain two
entries. Each bit in the bitmap array represents a pixel. If the bit is
clear, the pixel is displayed with the color of the first entry in the
bmciColors table. If the bit is set, the pixel has the color of the second
entry in the table.4 The bitmap has a maximum of 16 colors, and the bmciColors member
contains 16 entries. Each pixel in the bitmap is represented by a four-bit
index into the color table.For example, if the first byte in the bitmap is 0x1F, the byte represents two
pixels. The first pixel contains the color in the second table entry, and the
second pixel contains the color in the sixteenth table entry.8 The bitmap has a maximum of 256 colors, and the bmciColors member
contains 256 entries. In this case, each byte in the array represents a
single pixel.24 The bitmap has a maximum of 2^24 colors. The bmciColors member is
NULL, and each 3-byte sequence in the bitmap array represents the relative
intensities of red, green, and blue, respectively, of a pixel.The colors in the bmciColors table should appear in order of importance.
Alternatively, for functions that use DIBs, the bmciColors member can be an
array of 16-bit unsigned integers that specify an index into the currently
realized logical palette instead of explicit RGB values. In this case, an
application using the bitmap must call DIB functions with the wUsage
parameter set to DIB_PAL_COLORS.Note: The bmciColors member should not contain palette indexes if the
bitmap is to be stored in a file or transferred to another application.
Unless the application uses the bitmap exclusively and under its complete
control, the bitmap color table should contain explicit RGB values.See AlsoBITMAPINFO, BITMAPCOREHEADER, RGBTRIPLE
==============================================================================
BITMAPCOREHEADER (3.0)typedef struct tagBITMAPCOREHEADER { /* bmch */
DWORD bcSize;
short bcWidth;
short bcHeight;
WORD bcPlanes;
WORD bcBitCount;
} BITMAPCOREHEADER;The BITMAPCOREHEADER structure contains information about the dimensions and
color format of a device-independent bitmap (DIB). Windows applications
should use the BITMAPINFOHEADER structure instead of BITMAPCOREHEADER
whenever possible.Member DescriptionbcSize Specifies the number of bytes required by the
BITMAPCOREHEADER structure.bcWidth Specifies the width of the bitmap, in pixels.
bcHeightSpecifies the height of the bitmap, in pixels. bcPlanesSpecifies the number of planes for the target device. This
member must be set to 1.bcBitCount Specifies the number of bits per pixel. This value must be 1,
4, 8, or 24.CommentsThe BITMAPCOREINFO structure combines the BITMAPCOREHEADER structure and a
color table to provide a complete definition of the dimensions and colors of
a DIB. See the description of the BITMAPCOREINFO structure for more
information about specifying a DIB.An application should use the information stored in the bcSize member to
locate the color table in a BITMAPCOREINFO structure with a method such as
the following:lpColor = ((LPSTR) pBitmapCoreInfo + (UINT) (pBitmapCoreInfo->bcSize))See AlsoBITMAPCOREINFO, BITMAPINFOHEADER, BITMAPINFOHEADER =============================================================================
RGBTRIPLE (3.0)typedef struct tagRGBTRIPLE { /* rgbt */
BYTE rgbtBlue;
BYTE rgbtGreen;
BYTE rgbtRed;
} RGBTRIPLE;The RGBTRIPLE structure describes a color consisting of relative intensities
of red, green, and blue. The bmciColors member of the BITMAPCOREINFO
structure consists of an array of RGBTRIPLE structures. Windows applications
should use the BITMAPINFO structure instead of BITMAPCOREINFO whenever
possible. The BITMAPINFO structure uses an RGBQUAD structure instead of the
RGBTRIPLE structure.Member DescriptionrgbtBlueSpecifies the intensity of blue in the color.
rgbtGreen Specifies the intensity of green in the color.
rgbtRed Specifies the intensity of red in the color.See AlsoBITMAPCOREINFO, BITMAPINFO, RGBQUAD==============================================================================
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