SURFOBJ (Windows Embedded CE 6.0)

1/6/2010

Applies to Windows Embedded CE 6.0 R2

The SURFOBJ structure is the user object for a surface. A device driver usually calls methods on a surface object only when the surface object represents a GDI bitmap or a device–managed surface.

Syntax

typedef struct _SURFOBJ {
  DHSURF dhsurf;
  HSURF hsurf;
  DHPDEV dhpdev;
  HDEV hdev;
  SIZEL sizlBitmap;
  ULONG cjBits;
  PVOID pvBits;
  PVOID pvScan0;
  LONG lDelta;
  ULONG iUniq;
  ULONG iBitmapFormat;
  USHORT iType;
  USHORT fjBitmap;
} SURFOBJ;

Parameters

• dhsurf
  Handle to a surface, provided that the surface is device-managed. Otherwise, this member is zero.

• hsurf
  Handle to the surface.

• dhpdev
  Identifies the device's PDEV that is associated with the specified surface.

• hdev
  GDI's logical handle to the PDEV associated with this device.

• sizlBitmap
  Specifies a SIZEL structure that contains the width and height, in pixels, of the surface. The SIZEL structure is identical to the SIZE structure.

• cjBits
  Specifies the size of the buffer pointed to by pvBits.

• pvBits
  If the surface is a standard format bitmap, this is a pointer to the surface's pixels. For BMF_JPEG or BMF_PNG images, this is a pointer to a buffer containing the image data in a JPEG or PNG format. Otherwise, this member is NULL.

• pvScan0
  Pointer to the first scan line of the bitmap. If iBitmapFormat is BMF_JPEG or BMF_PNG, this member is NULL.

• lDelta
  Specifies the count of bytes required to move down one scan line in the bitmap. If iBitmapFormat is BMF_JPEG or BMF_PNG, this member is NULL.

• iUniq
  Specifies the current state of the specified surface. Every time the surface changes, this value is incremented. This enables drivers to cache source surfaces.

  For a surface that should not be cached, iUniq is set to zero. This value is used in conjunction with the BMF_DONTCACHE flag of fjBitmap.

• iBitmapFormat
  Specifies the standard format most closely matching this surface. If the iType member specifies a bitmap (STYPE_BITMAP), this member specifies its format. NT-based operating systems support a set of predefined formats, although applications can also send device-specific formats by using SetDIBitsToDevice.

  Supported predefined formats include the following:

  Value	Meaning
  BMF_1BPP	1 bit per pixel.
  BMF_4BPP	4 bits per pixel.
  BMF_8BPP	8 bits per pixel.
  BMF_16BPP	16 bits per pixel.
  BMF_24BPP	24 bits per pixel.
  BMF_32BPP	32 bits per pixel.
  BMF_4RLE	4 bits per pixel, run length encoded.
  BMF_8RLE	8 bits per pixel, run length encoded.
  BMF_JPEG	JPEG compressed image.
  BMF_PNG	PNG compressed image.

• iType
  Surface type, which is one of the following:

  Type	Definition
  STYPE_BITMAP	The surface is a bitmap.
  STYPE_DEVBITMAP	The surface is a device format bitmap.
  STYPE_DEVICE	The surface is managed by the device.

• fjBitmap
  If the surface is of type STYPE_BITMAP and is a standard uncompressed format bitmap, the following flags can be set. Otherwise, this member should be ignored.

  Value	Meaning
  BMF_DONTCACHE	The bitmap should not be cached by the driver because it is a transient bitmap, created by GDI, that the driver will never see again. If this flag is set, the iUniq member of this structure will be set to 0.
  BMF_KMSECTION	Is used by GDI only and should be ignored by the driver.
  BMF_NOTSYSMEM	The bitmap is not in system memory.
  BMF_NOZEROINIT	The bitmap was not zero–initialized.
  BMF_TOPDOWN	The first scan line represents the top of the bitmap.
  BMF_WINDOW_BLT	GDI sets this flag to notify the driver of a window move from one screen location to another.

Remarks

When information about a particular surface is required by a driver, the driver must access the SURFOBJ. This structure allows quick access to the properties of the surface.

When a SURFOBJ structure represents a GDI bitmap, the driver must be able to determine the format of the bitmap and locate the bitmap bits.

When a SURFOBJ structure represents a device surface, the driver must be able to locate the device handle for the surface.

For more information about supporting JPEG and PNG compressed images, see DEVINFO.

Requirements

See Also

Reference

Pluggable Fonts Reference

Other Resources

Fonts Structures
Pluggable Fonts