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请问“LPBITMAPV5HEADER”结构是如何定义的？
typedef struct {
DWORD bV5Size;
LONG bV5Width;
LONG bV5Height;
WORD bV5Planes;
WORD bV5BitCount;
DWORD bV5Compression;
DWORD bV5SizeImage;
LONG bV5XPelsPerMeter;
LONG bV5YPelsPerMeter;
DWORD bV5ClrUsed;
DWORD bV5ClrImportant;
DWORD bV5RedMask;
DWORD bV5GreenMask;
DWORD bV5BlueMask;
DWORD bV5AlphaMask;
DWORD bV5CSType;
CIEXYZTRIPLE bV5Endpoints;
DWORD bV5GammaRed;
DWORD bV5GammaGreen;
DWORD bV5GammaBlue;
DWORD bV5Intent;
DWORD bV5ProfileData;
DWORD bV5ProfileSize;
DWORD bV5Reserved;
} BITMAPV5HEADER, *PBITMAPV5HEADER,*LPBITMAPV5HEADER;
LPBITMAPV5HEADER应该是后来加上去的.
BITMAPV5HEADER
typedef struct {
DWORD bV5Size;
LONG bV5Width;
LONG bV5Height;
WORD bV5Planes;
WORD bV5BitCount;
DWORD bV5Compression;
DWORD bV5SizeImage;
LONG bV5XPelsPerMeter;
LONG bV5YPelsPerMeter;
DWORD bV5ClrUsed;
DWORD bV5ClrImportant;
DWORD bV5RedMask;
DWORD bV5GreenMask;
DWORD bV5BlueMask;
DWORD bV5AlphaMask;
DWORD bV5CSType;
CIEXYZTRIPLE bV5Endpoints;
DWORD bV5GammaRed;
DWORD bV5GammaGreen;
DWORD bV5GammaBlue;
DWORD bV5Intent;
DWORD bV5ProfileData;
DWORD bV5ProfileSize;
DWORD bV5Reserved;
} BITMAPV5HEADER, *PBITMAPV5HEADER;
Members
bV5Size
Specifies the number of bytes required by the structure. Applications should use this member to determine which bitmap information header structure is being used.
bV5Width
Specifies the width of the bitmap, in pixels.
If bV5Compression is BI_JPEG or BI_PNG, the bV5Width member specifies the width of the decompressed JPEG or PNG image in pixels.
bV5Height
Specifies the height of the bitmap, in pixels. If the value of bV5Height is positive, the bitmap is a bottom-up DIB and its origin is the lower-left corner. If bV5Height value is negative, the bitmap is a top-down DIB and its origin is the upper-left corner.
If bV5Height is negative, indicating a top-down DIB, bV5Compression must be either BI_RGB or BI_BITFIELDS. -down DIBs cannot be compressed.
If bV5Compression is BI_JPEG or BI_PNG, the bV5Height member specifies the height of the decompressed JPEG or PNG image in pixels.
bV5Planes
Specifies the number of planes for the target device. This value must be set to 1.
bV5BitCount
Specifies the number of bits that define each pixel and the maximum number of colors in the bitmap.
This member can be one of the following values. Value Meaning
0 The number of bits per pixel is specified or is implied by the JPEG or PNG file format.
1 The bitmap is monochrome, and the bmiColors member of BITMAPINFO 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 bmiColors color 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 bmiColors member of BITMAPINFO contains up to 16 entries. 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 The bitmap has a maximum of 256 colors, and the bmiColors member of BITMAPINFO contains up to 256 entries. In this case, each byte in the array represents a single pixel.
16 The bitmap has a maximum of 2^16 colors. If the bV5Compression member of the BITMAPV5HEADER structure is BI_RGB, the bmiColors member of BITMAPINFO is NULL. Each WORD in the bitmap array represents a single pixel. The relative intensities of red, green, and blue are represented with five bits for each color component. The value for blue is in the least significant five bits, followed by five bits each for green and red. The most significant bit is not used. The bmiColors color table is used for optimizing colors used on palette-based devices, and must contain the number of entries specified by the bV5ClrUsed member of the BITMAPV5HEADER.
If the bV5Compression member of the BITMAPV5HEADER is BI_BITFIELDS, the bmiColors member contains three DWORD color masks that specify the red, green, and blue components, respectively, of each pixel. Each WORD in the bitmap array represents a single pixel.
When the bV5iCompression member is BI_BITFIELDS, bits set in each DWORD mask must be contiguous and should not overlap the bits of another mask. All the bits in the pixel do not need to be used.
24 The bitmap has a maximum of 2^24 colors, and the bmiColors member of BITMAPINFO is NULL. Each 3-byte triplet in the bitmap array represents the relative intensities of blue, green, and red, respectively, for a pixel. The bmiColors color table is used for optimizing colors used on palette-based devices, and must contain the number of entries specified by the bV5ClrUsed member of the BITMAPV5HEADER structure.
32 The bitmap has a maximum of 2^32 colors. If the bV5Compression member of the BITMAPV5HEADER is BI_RGB, the bmiColors member of BITMAPINFO is NULL. Each DWORD in the bitmap array represents the relative intensities of blue, green, and red, respectively, for a pixel. The high byte in each DWORD is not used. The bmiColors color table is used for optimizing colors used on palette-based devices, and must contain the number of entries specified by the bV5ClrUsed member of the BITMAPV5HEADER.
If the bV5Compression member of the BITMAPV5HEADER is BI_BITFIELDS, the bmiColors member contains three DWORD color masks that specify the red, green, and blue components of each pixel. Each DWORD in the bitmap array represents a single pixel.
LPBITMAPV5HEADER是指针吧～～
去看一下MSDN吧～
