DEVICESURFACE

Pointer to information needed by the graphics engine that represents the device's physical surface.

Type

typedef struct _DEVICESURFACE {
 ULONG            ulLength;
 BMAPINFO         SurfaceBmapInfo;
 ULONG            ulDSFlgs;
 ULONG            ulStyleRatio;
 BMAPINFO         abmapinfoDefPattern[DEFAULT_PATTERNS_NUMBER];
 PVOID            pHWPalette;
 DITHERMATRIX     DitherMatrix;
 PFN              pfnDevLockDC;
 PFN              pfnDevUnLockDC;
 PFN              pfnBitBlt;
 PFN              pfnLine;
 PFN              pfnReserved;
 PFN              pfnLockPhysDev;
 PFN              pfnUnLockPhysDev;
 ULONG            ulReserved[5];
 ULONG            ulCapsCnt;
 ULONG            DevCaps[CAPS_MAX_CAPS + 1];
} DEVICESURFACE;

C Declaration Method

typedef DEVICESURFACE *PDEVICESURFACE;

Fields

ulLength

Length of the DEVICESURFACE data structure, in bytes.

SurfaceBmapInfo

Information used by the graphics engine when rastering to a linear address. (See BMAPINFO in Data Types)

ulDSFlgs

Miscellaneous flags used by the graphics engine for rendering of rasterized data.

Color format flag

DS_MONO_INVERT: Mono ROPs are inverted.

Destination color format flags

DS_COLOR_RGB: Color is in RGB.

DS_COLOR_RGB2: Color is in RGB2 (default).

DS_COLOR_24BIT_BGR: First byte=blue (default).

DS_COLOR_24BIT_RGB: First byte=red, second byte=green, third byte=blue.

DS_COLOR_16BIT_565_BGR

Blue 5 bits (default)

Green 6 bits

Red 5 bits

|b|b|b|b|b|g|g|g|g|g|g|r|r|r|r|r|

DS_COLOR_16BIT_565_RGB

Red 5 bits

Green 6 bits

Blue 5 bits

|r|r|r|r|r|g|g|g|g|g|g|b|b|b|b|b|

DS_COLOR_16BIT_1555_BGR

Overlay 1

Blue 5 bits

Green 5 bits

Red 5 bits

|o|b|b|b|b|b|g|g|g|g|g|r|r|r|r|r|

DS_COLOR_16BIT_1555_RGB

Overlay 1

Red 5 bits

Green 5 bits

Blue 5 bits

|o|r|r|r|r|r|g|g|g|g|g|b|b|b|b|b|

Direction flags

DS_BOTTOMTOP: Bottom-to-top is Y position.

DS_TOPBOTTOM: Top-to-bottom is Y position.

Hardcopy flag

DS_QUEUED_RAW_DEFAULT: Set QUEUED to RAW as default.

Notification flag

DS_NOTIFY_LAST_SDBITBLT: Last banded blit per API bit map transfer.

Scanline alignment flags

DS_BYTE_ALIGNMENT: DS scan line alignment.

DS_2BYTE_ALIGNMENT: DS scan line alignment.

DS_4BYTE_ALIGNMENT: DS scan line alignment.

DS_KEEP_EXTFORMAT: Variable alignment; let application decide.

Device Font Flags

Normal output to the device from the graphics subsystem is generated from the device origin with scan lines horizontal and incrementing both pels and scan lines. This output can be altered by the following flags:

DS_BITBLT_XROW_YSCAN: Generates row data as sequential bit stream instead of scan line data.

DS_BITBLT_ROW_NEGATIVE: Generates rows in opposite direction, for example, Start at Device Origin + Device Height.

DS_BITBLT_SCAN_NEGATIVE: Generates scan lines in opposite direction, for example, Start at Device Origin + Device Length.

Output Surface Direction Flags

As of OS/2 Warp Version 4, the graphics subsystem added device font support for the new device driver model. Below are some of the device surface flags to support it:

DS_DOWNLOAD_FONTS: (GRE_VERSION 234) - The device request downloading of system fonts via pfnTextBlt in new cached format.

DS_DEVICE_FONTS: (GRE_VERSION 234) - The device has its own hardware fonts. It will provide font definition information, but wants the system to handle all query and character string operations. It will render fonts via the pfnTextBlt call.

DS_FONT_CLIP_SUPPORT: (GRE_VERSION 238) - In Gre Version 234, only the precise rule is used.

DS_CLIP_100_RULE: Graphics subsystem will not send the glyph to the driver unless it is fully visible.

DS_CLIP_66_RULE: Graphics subsystem will only send the glyph to the driver if it is at least 66% visible.

DS_CLIP_PRECISE_RULE: Graphics subsystem will send the all glyphs to the driver with all the current clip rectangles.

Surface description flag

DS_MEMORY: Memory surface.

ulStyleRatio

Default style ratio used by the current device.

abmapinfoDefPattern[]

Set of default patterns supplied by the graphics engine that can be changed by the presentation driver. [DEFAULT_PATTERNS_NUMBER].

pHWPalette

Default hardware palette for the current device.

DitherMatrix

Default is the generic dither support for hardcopy devices.

For additional details on dithering refer to the section, Dithering/Color Mapping Interface.

ulLength: Length of dither matrix structure.

fExt2IntSup: Gre dither flags for external to internal.

pExt2IntDI: Used for GDM_USERDEF. Pointer to users dither information.

fStretchSup: Gre dither flags for stretch support.

pStretchDI

Used for GDM_USERDEF. Pointer to users dither information.

fLog2PhysSup

Gre dither flags for logical to physical color mapping.

pLog2PhysDI

Used for GDM_USERDEF. Pointer to users dither information.

pfnDither

Used for GDM_USERDEF. Pointer to users dither function.

DitherMatrix Flags:

GDM_NO_DITHER

No dithering in system.

GDM_USERDEF_DITHER

Users supplies own dithering routines.

GDM_MATRIX_DITHER

Use system-ordered dithering.

GDM_ERRORDIF_DITHER

Use system error diffusion dithering.

GDM_DITHER_BEGIN

Used with dithering that needs to save data across output bands of an image.

GDM_DITHER_END

Used with dithering that needs to save data across output bands of an image.

GDM_COLOR_CONVERT

Use device's color mapping functions.

pfnDevLockDC

Pointer to allow the device driver to retrieve its device-specific information from the graphics engine. Pointer is stored by the device driver.

pfnDevUnLockDC

Pointer to the function to release the lock on the current DC. Pointer is stored by the device driver.

pfnBitBlt

Pointer defaults to SOFTDRAW's handling of the new SDBitBlt function. If a device does not have linear address support or would rather handle preclipped bit map transfers itself, then it should hook out this function with its own routine.

pfnLine

Pointer defaults to SOFTDRAW's handling of the new SDLine function. If a device does not have linear address support or would rather handle preclipped line operations itself, then it should hook out this function with its own routine.

pfnTextBlt

Used in conjunction with DS_DOWNLOAD_FONTS and DS_DEVICE_FONTS. If flags are not specified, text strings will be simulated through bitblts.

Refer to Device Font Support for additional details.

pfnLockPhysDev

Pointer prevents other processes from accessing the physical hardware between the lock and unlock.

pfnUnLockPhysDev

Pointer releases the physical hardware for access by other processes.

ulhddc:Handle to device's device context.

ulReserved[4]

Reserved by system.

ulCapsCnt

Size in ULONGs of the DevCaps field.

DevCaps[]

The device capabilities array in OS/2 2.0 and previous versions. Array must be filled out in order for the graphics engine to handle a call to the DevQueryCaps function. [CAPS_MAX_CAPS + 1]