windows-server-2003/windows/advcore/gdiplus/sdkinc/gdipluspixelformats.h

/**************************************************************************\
*
* Copyright (c) 1998-2001, Microsoft Corp.  All Rights Reserved.
*
* Module Name:
*
*   Gdiplus Pixel Formats
*
* Abstract:
*
*   GDI+ Pixel Formats
*
\**************************************************************************/

#ifndef _GDIPLUSPIXELFORMATS_H
#define _GDIPLUSPIXELFORMATS_H

typedef DWORD ARGB;
typedef DWORDLONG ARGB64;

#define ALPHA_SHIFT 24
#define RED_SHIFT   16
#define GREEN_SHIFT 8
#define BLUE_SHIFT  0
#define ALPHA_MASK  ((ARGB) 0xff << ALPHA_SHIFT)

// In-memory pixel data formats:
// bits 0-7 = format index
// bits 8-15 = pixel size (in bits)
// bits 16-23 = flags
// bits 24-31 = reserved

typedef INT PixelFormat;

#define    PixelFormatIndexed      0x00010000 // Indexes into a palette
#define    PixelFormatGDI          0x00020000 // Is a GDI-supported format
#define    PixelFormatAlpha        0x00040000 // Has an alpha component
#define    PixelFormatPAlpha       0x00080000 // Pre-multiplied alpha
#define    PixelFormatExtended     0x00100000 // Extended color 16 bits/channel
#define    PixelFormatCanonical    0x00200000 

#define    PixelFormatUndefined       0
#define    PixelFormatDontCare        0

#define    PixelFormat1bppIndexed     (1 | ( 1 << 8) | PixelFormatIndexed | PixelFormatGDI)
#define    PixelFormat4bppIndexed     (2 | ( 4 << 8) | PixelFormatIndexed | PixelFormatGDI)
#define    PixelFormat8bppIndexed     (3 | ( 8 << 8) | PixelFormatIndexed | PixelFormatGDI)
#define    PixelFormat16bppGrayScale  (4 | (16 << 8) | PixelFormatExtended)
#define    PixelFormat16bppRGB555     (5 | (16 << 8) | PixelFormatGDI)
#define    PixelFormat16bppRGB565     (6 | (16 << 8) | PixelFormatGDI)
#define    PixelFormat16bppARGB1555   (7 | (16 << 8) | PixelFormatAlpha | PixelFormatGDI)
#define    PixelFormat24bppRGB        (8 | (24 << 8) | PixelFormatGDI)
#define    PixelFormat32bppRGB        (9 | (32 << 8) | PixelFormatGDI)
#define    PixelFormat32bppARGB       (10 | (32 << 8) | PixelFormatAlpha | PixelFormatGDI | PixelFormatCanonical)
#define    PixelFormat32bppPARGB      (11 | (32 << 8) | PixelFormatAlpha | PixelFormatPAlpha | PixelFormatGDI)
#define    PixelFormat48bppRGB        (12 | (48 << 8) | PixelFormatExtended)
#define    PixelFormat64bppARGB       (13 | (64 << 8) | PixelFormatAlpha  | PixelFormatCanonical | PixelFormatExtended)
#define    PixelFormat64bppPARGB      (14 | (64 << 8) | PixelFormatAlpha  | PixelFormatPAlpha | PixelFormatExtended)
#define    PixelFormatMax             15

inline UINT
GetPixelFormatSize(
                   PixelFormat pixfmt
    )
{
    return (pixfmt >> 8) & 0xff;
}

inline BOOL
IsIndexedPixelFormat(
                     PixelFormat pixfmt
    )
{
    return (pixfmt & PixelFormatIndexed) != 0;
}

inline BOOL
IsAlphaPixelFormat(
                     PixelFormat pixfmt
)
{
   return (pixfmt & PixelFormatAlpha) != 0;
}

inline BOOL
IsExtendedPixelFormat(
                     PixelFormat pixfmt
    )
{
   return (pixfmt & PixelFormatExtended) != 0;
}

//--------------------------------------------------------------------------
// Determine if the Pixel Format is Canonical format:
//   PixelFormat32bppARGB
//   PixelFormat32bppPARGB
//   PixelFormat64bppARGB
//   PixelFormat64bppPARGB
//--------------------------------------------------------------------------

inline BOOL
IsCanonicalPixelFormat(
                     PixelFormat pixfmt
    )
{
   return (pixfmt & PixelFormatCanonical) != 0;
}

enum PaletteFlags
{
    PaletteFlagsHasAlpha    = 0x0001,
    PaletteFlagsGrayScale   = 0x0002,
    PaletteFlagsHalftone    = 0x0004
};

struct ColorPalette
{
public:
    UINT Flags;             // Palette flags
    UINT Count;             // Number of color entries
    ARGB Entries[1];        // Palette color entries
};

#endif