mirror of https://github.com/dahall/Vanara.git
456 lines
22 KiB
C#
456 lines
22 KiB
C#
using System;
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using System.Runtime.InteropServices;
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namespace Vanara.PInvoke
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{
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/// <summary>Functions and types from Gdi32.dll.</summary>
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public static partial class Gdi32
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{
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/// <summary>The type of compression for a compressed bottom-up bitmap (top-down DIBs cannot be compressed). Used in <see cref="BITMAPINFOHEADER"/>.</summary>
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[PInvokeData("Wingdi.h", MSDNShortId = "dd183376")]
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public enum BitmapCompressionMode : uint
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{
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/// <summary>An uncompressed format.</summary>
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BI_RGB = 0,
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/// <summary>
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/// A run-length encoded (RLE) format for bitmaps with 8 bpp. The compression format is a 2-byte format consisting of a count
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/// byte followed by a byte containing a color index.
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/// </summary>
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BI_RLE8 = 1,
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/// <summary>
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/// An RLE format for bitmaps with 4 bpp. The compression format is a 2-byte format consisting of a count byte followed by two
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/// word-length color indexes.
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/// </summary>
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BI_RLE4 = 2,
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/// <summary>
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/// Specifies that the bitmap is not compressed and that the color table consists of three DWORD color masks that specify the
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/// red, green, and blue components, respectively, of each pixel. This is valid when used with 16- and 32-bpp bitmaps.
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/// </summary>
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BI_BITFIELDS = 3,
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/// <summary>Indicates that the image is a JPEG image.</summary>
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BI_JPEG = 4,
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/// <summary>Indicates that the image is a PNG image.</summary>
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BI_PNG = 5
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}
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/// <summary>The BITMAP structure defines the type, width, height, color format, and bit values of a bitmap.</summary>
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[StructLayout(LayoutKind.Sequential)]
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[PInvokeData("Wingdi.h", MSDNShortId = "dd183371")]
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public struct BITMAP
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{
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/// <summary>The bitmap type. This member must be zero.</summary>
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public int bmType;
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/// <summary>The width, in pixels, of the bitmap. The width must be greater than zero.</summary>
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public int bmWidth;
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/// <summary>The height, in pixels, of the bitmap. The height must be greater than zero.</summary>
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public int bmHeight;
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/// <summary>
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/// The number of bytes in each scan line. This value must be divisible by 2, because the system assumes that the bit values of
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/// a bitmap form an array that is word aligned.
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/// </summary>
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public int bmWidthBytes;
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/// <summary>The count of color planes.</summary>
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public ushort bmPlanes;
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/// <summary>The number of bits required to indicate the color of a pixel.</summary>
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public ushort bmBitsPixel;
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/// <summary>
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/// A pointer to the location of the bit values for the bitmap. The bmBits member must be a pointer to an array of character
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/// (1-byte) values.
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/// </summary>
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public IntPtr bmBits;
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}
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/// <summary>The BITMAPINFO structure defines the dimensions and color information for a DIB.</summary>
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/// <remarks>
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/// A DIB consists of two distinct parts: a BITMAPINFO structure describing the dimensions and colors of the bitmap, and an array of
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/// bytes defining the pixels of the bitmap. The bits in the array are packed together, but each scan line must be padded with zeros
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/// to end on a LONG data-type boundary. If the height of the bitmap is positive, the bitmap is a bottom-up DIB and its origin is
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/// the lower-left corner. If the height is negative, the bitmap is a top-down DIB and its origin is the upper left corner.
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/// <para>
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/// A bitmap is packed when the bitmap array immediately follows the BITMAPINFO header. Packed bitmaps are referenced by a single
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/// pointer. For packed bitmaps, the biClrUsed member must be set to an even number when using the DIB_PAL_COLORS mode so that the
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/// DIB bitmap array starts on a DWORD boundary.
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/// </para>
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/// <para><c>Note</c></para>
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/// <para>
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/// The bmiColors member should not contain palette indexes if the bitmap is to be stored in a file or transferred to another application.
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/// </para>
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/// <para>
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/// Unless the application has exclusive use and control of the bitmap, the bitmap color table should contain explicit RGB values.
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/// </para>
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/// </remarks>
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[StructLayout(LayoutKind.Sequential)]
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[PInvokeData("Wingdi.h", MSDNShortId = "dd183375")]
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public struct BITMAPINFO
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{
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/// <summary>A BITMAPINFOHEADER structure that contains information about the dimensions of color format.</summary>
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public BITMAPINFOHEADER bmiHeader;
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/// <summary>
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/// The bmiColors member contains one of the following:
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/// <list type="bullet">
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/// <item>
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/// <description>An array of RGBQUAD. The elements of the array that make up the color table.</description>
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/// </item>
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/// <item>
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/// <description>
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/// An array of 16-bit unsigned integers that specifies indexes into the currently realized logical palette. This use of
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/// bmiColors is allowed for functions that use DIBs. When bmiColors elements contain indexes to a realized logical palette,
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/// they must also call the following bitmap
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/// functions: CreateDIBitmap, CreateDIBPatternBrush, CreateDIBSection (The iUsage parameter of CreateDIBSection must be set to DIB_PAL_COLORS.)
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/// </description>
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/// </item>
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/// </list>
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/// <para>
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/// The number of entries in the array depends on the values of the biBitCount and biClrUsed members of the BITMAPINFOHEADER structure.
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/// </para>
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/// <para>The colors in the bmiColors table appear in order of importance. For more information, see the Remarks section.</para>
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/// </summary>
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 1)]
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public RGBQUAD[] bmiColors;
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/// <summary>Initializes a new instance of the <see cref="BITMAPINFO"/> structure.</summary>
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/// <param name="width">The width.</param>
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/// <param name="height">The height.</param>
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/// <param name="bitCount">The bit count.</param>
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public BITMAPINFO(int width, int height, ushort bitCount = 32)
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: this()
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{
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bmiHeader = new BITMAPINFOHEADER(width, height, bitCount);
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}
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/// <summary>Creates a <see cref="BITMAPINFO"/> structure from the information in a bitmap handle.</summary>
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/// <param name="hBmp">The handle to a bitmap.</param>
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/// <returns>
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/// A structure with all the information the bitmap handle. If the specified bitmap is less than 24bpp, this resulting structure
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/// must not be used without creating unmanaged memory to hold the structure and <c>BITMAPINFO.bmiHeader.biClrUsed *
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/// sizeof(RGBQUAD)</c> extra bytes.
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/// </returns>
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public static BITMAPINFO FromHBITMAP(in HBITMAP hBmp) => new BITMAPINFO { bmiHeader = BITMAPINFOHEADER.FromHBITMAP(hBmp) };
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}
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/// <summary>The BITMAPINFOHEADER structure contains information about the dimensions and color format of a DIB.</summary>
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[StructLayout(LayoutKind.Sequential)]
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[PInvokeData("Wingdi.h", MSDNShortId = "dd183376")]
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public struct BITMAPINFOHEADER
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{
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/// <summary>The number of bytes required by the structure.</summary>
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public int biSize;
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/// <summary>
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/// The width of the bitmap, in pixels. If biCompression is BI_JPEG or BI_PNG, the biWidth member specifies the width of the
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/// decompressed JPEG or PNG image file, respectively.
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/// </summary>
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public int biWidth;
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/// <summary>
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/// The height of the bitmap, in pixels. If biHeight is positive, the bitmap is a bottom-up DIB and its origin is the lower-left
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/// corner. If biHeight is negative, the bitmap is a top-down DIB and its origin is the upper-left corner.
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/// <para>
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/// If biHeight is negative, indicating a top-down DIB, biCompression must be either BI_RGB or BI_BITFIELDS. Top-down DIBs
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/// cannot be compressed.
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/// </para>
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/// <para>
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/// If biCompression is BI_JPEG or BI_PNG, the biHeight member specifies the height of the decompressed JPEG or PNG image file, respectively.
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/// </para>
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/// </summary>
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public int biHeight;
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/// <summary>The number of planes for the target device. This value must be set to 1.</summary>
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public ushort biPlanes;
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/// <summary>
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/// The number of bits-per-pixel. The biBitCount member of the BITMAPINFOHEADER structure determines the number of bits that
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/// define each pixel and the maximum number of colors in the bitmap. This member must be one of the following values.
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/// <list type="table">
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/// <listheader>
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/// <term>Value</term>
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/// <description>Meaning</description>
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/// </listheader>
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/// <item>
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/// <term>0</term>
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/// <description>The number of bits-per-pixel is specified or is implied by the JPEG or PNG format.</description>
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/// </item>
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/// <item>
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/// <term>1</term>
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/// <description>
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/// The bitmap is monochrome, and the bmiColors member of BITMAPINFO contains two entries. Each bit in the bitmap array
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/// represents a pixel. If the bit is clear, the pixel is displayed with the color of the first entry in the bmiColors table; if
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/// the bit is set, the pixel has the color of the second entry in the table.
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/// </description>
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/// </item>
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/// <item>
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/// <term>4</term>
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/// <description>
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/// The bitmap has a maximum of 16 colors, and the bmiColors member of BITMAPINFO contains up to 16 entries. Each pixel in the
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/// 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
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/// represents two pixels. The first pixel contains the color in the second table entry, and the second pixel contains the color
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/// in the sixteenth table entry.
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/// </description>
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/// </item>
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/// <item>
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/// <term>8</term>
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/// <description>
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/// The bitmap has a maximum of 256 colors, and the bmiColors member of BITMAPINFO contains up to 256 entries. In this case,
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/// each byte in the array represents a single pixel.
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/// </description>
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/// </item>
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/// <item>
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/// <term>16</term>
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/// <description>
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/// The bitmap has a maximum of 2^16 colors. If the biCompression member of the BITMAPINFOHEADER is BI_RGB, the bmiColors member
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/// of BITMAPINFO is NULL. Each WORD in the bitmap array represents a single pixel. The relative intensities of red, green, and
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/// blue are represented with five bits for each color component. The value for blue is in the least significant five bits,
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/// followed by five bits each for green and red. The most significant bit is not used. The bmiColors color table is used for
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/// optimizing colors used on palette-based devices, and must contain the number of entries specified by the biClrUsed member of
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/// the BITMAPINFOHEADER.
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/// <para>
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/// If the biCompression member of the BITMAPINFOHEADER is BI_BITFIELDS, the bmiColors member contains three DWORD color masks
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/// that specify the red, green, and blue components, respectively, of each pixel. Each WORD in the bitmap array represents a
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/// single pixel.
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/// </para>
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/// <para>
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/// When the biCompression member is BI_BITFIELDS, bits set in each DWORD mask must be contiguous and should not overlap the
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/// bits of another mask. All the bits in the pixel do not have to be used.
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/// </para>
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/// </description>
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/// </item>
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/// <item>
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/// <term>24</term>
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/// <description>
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/// The bitmap has a maximum of 2^24 colors, and the bmiColors member of BITMAPINFO is NULL. Each 3-byte triplet in the bitmap
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/// array represents the relative intensities of blue, green, and red, respectively, for a pixel. The bmiColors color table is
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/// used for optimizing colors used on palette-based devices, and must contain the number of entries specified by the biClrUsed
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/// member of the BITMAPINFOHEADER.
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/// </description>
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/// </item>
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/// <item>
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/// <term>32</term>
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/// <description>
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/// The bitmap has a maximum of 2^32 colors. If the biCompression member of the BITMAPINFOHEADER is BI_RGB, the bmiColors member
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/// of BITMAPINFO is NULL. Each DWORD in the bitmap array represents the relative intensities of blue, green, and red for a
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/// pixel. The value for blue is in the least significant 8 bits, followed by 8 bits each for green and red. The high byte in
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/// each DWORD is not used. The bmiColors color table is used for optimizing colors used on palette-based devices, and must
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/// contain the number of entries specified by the biClrUsed member of the BITMAPINFOHEADER.
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/// <para>
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/// If the biCompression member of the BITMAPINFOHEADER is BI_BITFIELDS, the bmiColors member contains three DWORD color masks
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/// that specify the red, green, and blue components, respectively, of each pixel. Each DWORD in the bitmap array represents a
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/// single pixel.
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/// </para>
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/// <para>
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/// When the biCompression member is BI_BITFIELDS, bits set in each DWORD mask must be contiguous and should not overlap the
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/// bits of another mask. All the bits in the pixel do not need to be used.
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/// </para>
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/// </description>
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/// </item>
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/// </list>
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/// </summary>
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public ushort biBitCount;
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/// <summary>The type of compression for a compressed bottom-up bitmap (top-down DIBs cannot be compressed).</summary>
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public BitmapCompressionMode biCompression;
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/// <summary>
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/// The size, in bytes, of the image. This may be set to zero for BI_RGB bitmaps. If biCompression is BI_JPEG or BI_PNG,
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/// biSizeImage indicates the size of the JPEG or PNG image buffer, respectively.
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/// </summary>
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public uint biSizeImage;
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/// <summary>
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/// The horizontal resolution, in pixels-per-meter, of the target device for the bitmap. An application can use this value to
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/// select a bitmap from a resource group that best matches the characteristics of the current device.
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/// </summary>
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public int biXPelsPerMeter;
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/// <summary>The vertical resolution, in pixels-per-meter, of the target device for the bitmap.</summary>
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public int biYPelsPerMeter;
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/// <summary>
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/// The number of color indexes in the color table that are actually used by the bitmap. If this value is zero, the bitmap uses
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/// the maximum number of colors corresponding to the value of the biBitCount member for the compression mode specified by biCompression.
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/// <para>
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/// If biClrUsed is nonzero and the biBitCount member is less than 16, the biClrUsed member specifies the actual number of
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/// colors the graphics engine or device driver accesses. If biBitCount is 16 or greater, the biClrUsed member specifies the
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/// size of the color table used to optimize performance of the system color palettes. If biBitCount equals 16 or 32, the
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/// optimal color palette starts immediately following the three DWORD masks.
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/// </para>
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/// <para>
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/// When the bitmap array immediately follows the BITMAPINFO structure, it is a packed bitmap. Packed bitmaps are referenced by
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/// a single pointer. Packed bitmaps require that the biClrUsed member must be either zero or the actual size of the color table.
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/// </para>
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/// </summary>
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public uint biClrUsed;
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/// <summary>
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/// The number of color indexes that are required for displaying the bitmap. If this value is zero, all colors are required.
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/// </summary>
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public uint biClrImportant;
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/// <summary>Initializes a new instance of the <see cref="BITMAPINFOHEADER"/> structure.</summary>
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/// <param name="width">The width.</param>
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/// <param name="height">The height.</param>
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/// <param name="bitCount">The bit count.</param>
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public BITMAPINFOHEADER(int width, int height, ushort bitCount = 32)
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: this()
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{
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biSize = Marshal.SizeOf(typeof(BITMAPINFO));
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biWidth = width;
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biHeight = height;
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biPlanes = 1;
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biBitCount = bitCount;
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biCompression = BitmapCompressionMode.BI_RGB;
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biSizeImage = 0; // (uint)width * (uint)height * bitCount / 8;
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}
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/// <summary>Creates a <see cref="BITMAPINFOHEADER"/> structure from the information in a bitmap handle.</summary>
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/// <param name="hBmp">The handle to a bitmap.</param>
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/// <returns>
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/// A structure with all the information the bitmap handle. If the specified bitmap is less than 24bpp, the <see cref="biClrUsed"/> value is set to the
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/// number of <see cref="RGBQUAD"/> structures that must be allocated.
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/// </returns>
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public static BITMAPINFOHEADER FromHBITMAP(in HBITMAP hBmp)
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{
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// Retrieve the bitmap color format, width, and height.
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var bmp = GetObject<BITMAP>(hBmp);
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// Convert the color format to a count of bits.
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var cClrBits = (ushort)(bmp.bmPlanes * bmp.bmBitsPixel) switch
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{
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1 => 1,
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<= 4 => 4,
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<= 8 => 8,
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<= 16 => 16,
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<= 24 => 24,
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_ => 32,
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};
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// Initialize the fields in the BITMAPINFO structure.
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return new BITMAPINFOHEADER
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{
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biSize = Marshal.SizeOf(typeof(BITMAPINFOHEADER)),
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biWidth = bmp.bmWidth,
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biHeight = bmp.bmHeight,
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biPlanes = bmp.bmPlanes,
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biBitCount = bmp.bmBitsPixel,
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// This value is correct, but there is no memory alllocated to hold these bits
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biClrUsed = cClrBits < 24 ? 1U << cClrBits : 0,
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// If the bitmap is not compressed, set the BI_RGB flag.
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biCompression = BitmapCompressionMode.BI_RGB,
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// Compute the number of bytes in the array of color indices and store the result in biSizeImage. The width must be uint
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// aligned unless the bitmap is RLE compressed.
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biSizeImage = (uint)(((bmp.bmWidth * cClrBits + 31) & ~31) / 8 * bmp.bmHeight),
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// Set biClrImportant to 0, indicating that all of the device colors are important.
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biClrImportant = 0
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};
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}
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/// <summary>Gets the default value for this structure with size fields set appropriately.</summary>
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public static readonly BITMAPINFOHEADER Default = new BITMAPINFOHEADER { biSize = Marshal.SizeOf(typeof(BITMAPINFOHEADER)) };
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}
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/// <summary>
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/// The DIBSECTION structure contains information about a DIB created by calling the CreateDIBSection function. A DIBSECTION
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/// structure includes information about the bitmap's dimensions, color format, color masks, optional file mapping object, and
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/// optional bit values storage offset. An application can obtain a filled-in DIBSECTION structure for a given DIB by calling the
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/// GetObject function.
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/// </summary>
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[StructLayout(LayoutKind.Sequential)]
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[PInvokeData("Wingdi.h", MSDNShortId = "dd183567")]
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public struct DIBSECTION
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{
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/// <summary>
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/// A BITMAP data structure that contains information about the DIB: its type, its dimensions, its color capacities, and a
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/// pointer to its bit values.
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/// </summary>
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public BITMAP dsBm;
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/// <summary>A BITMAPINFOHEADER structure that contains information about the color format of the DIB.</summary>
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public BITMAPINFOHEADER dsBmih;
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private uint dsBitField1;
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private uint dsBitField2;
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private uint dsBitField3;
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/// <summary>
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/// The DSH sectionContains a handle to the file mapping object that the CreateDIBSection function used to create the DIB. If
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/// CreateDIBSection was called with a NULL value for its hSection parameter, causing the system to allocate memory for the
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/// bitmap, the dshSection member will be NULL.
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/// </summary>
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public IntPtr dshSection;
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/// <summary>
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/// The offset to the bitmap's bit values within the file mapping object referenced by dshSection. If dshSection is NULL, the
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/// dsOffset value has no meaning.
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/// </summary>
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public uint dsOffset;
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/// <summary>
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/// Specifies three color masks for the DIB. This field is only valid when the BitCount member of the BITMAPINFOHEADER structure
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/// has a value greater than 8. Each color mask indicates the bits that are used to encode one of the three color channels (red,
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/// green, and blue).
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/// </summary>
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#pragma warning disable IDE1006 // Naming Styles
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public uint[] dsBitFields
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#pragma warning restore IDE1006 // Naming Styles
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{
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get => new[] { dsBitField1, dsBitField2, dsBitField3 };
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set { dsBitField1 = value[0]; dsBitField2 = value[1]; dsBitField3 = value[2]; }
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}
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/// <summary>Gets the default value for this structure with size fields set appropriately.</summary>
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public static readonly DIBSECTION Default = new DIBSECTION { dsBmih = BITMAPINFOHEADER.Default };
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}
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/// <summary>The RGBQUAD structure describes a color consisting of relative intensities of red, green, and blue.</summary>
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[StructLayout(LayoutKind.Sequential)]
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[PInvokeData("Wingdi.h", MSDNShortId = "dd162938")]
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public struct RGBQUAD
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{
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/// <summary>The intensity of blue in the color.</summary>
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public byte rgbBlue;
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/// <summary>The intensity of green in the color.</summary>
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public byte rgbGreen;
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/// <summary>The intensity of red in the color.</summary>
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public byte rgbRed;
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/// <summary>This member is reserved and must be zero.</summary>
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public byte rgbReserved;
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/// <summary>Gets or sets the color associated with the <see cref="RGBQUAD"/> structure.</summary>
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/// <value>The color.</value>
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public System.Drawing.Color Color
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{
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get => System.Drawing.Color.FromArgb(rgbReserved, rgbRed, rgbGreen, rgbBlue);
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set { rgbReserved = value.A; rgbBlue = value.B; rgbGreen = value.G; rgbRed = value.R; }
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}
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/// <summary>Gets a value indicating whether any transparency is defined.</summary>
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/// <value><see langword="true"/> if this value is transparent; otherwise, <see langword="false"/>.</value>
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public bool IsTransparent => rgbReserved == 0;
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/// <summary>Performs an implicit conversion from <see cref="System.Drawing.Color"/> to <see cref="RGBQUAD"/>.</summary>
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/// <param name="c">The c.</param>
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/// <returns>The result of the conversion.</returns>
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public static implicit operator RGBQUAD(System.Drawing.Color c) => new RGBQUAD() { Color = c };
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/// <summary>Performs an implicit conversion from <see cref="RGBQUAD"/> to <see cref="System.Drawing.Color"/>.</summary>
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/// <param name="c">The c.</param>
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/// <returns>The result of the conversion.</returns>
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public static implicit operator System.Drawing.Color(RGBQUAD c) => c.Color;
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}
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}
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} |