GreDrawRLE

GreDrawRLE draws a run-length-encoded shape. If the call is passed back to the graphics engine, it calls the GrePolyScanline entry point.

This function can be hooked by the presentation driver.


 * Simulation support: This function is simulated by a handling routine in the graphics engine.

Syntax
GreDrawRLE(hdc, pRLEHDR, pInstance, lFunction)

Parameters

 * hdc (HDC) - input:Device context handle.
 * pRLEHDR (PRLEHDR) - input:Pointer to run-length-encoding data header (RLEHDR) structure.
 * pInstance (PVOID) - input:Pointer to instance data.
 * lFunction (ULONG) - input:High-order WORD=flags; low-order WORD=NGreDrawRLE.

Return Code

 * rc (ULONG) - returns:Return codes.
 * On completion, the handling routine must return an integer (cHits) indicating, where appropriate, whether correlation hits were detected:
 * GPI_OK Successful
 * GPI_HITS Successful with correlation hit (returned by display drivers when the correlation flag is ON, and a hit is detected)
 * GPI_ERROR Error
 * Possible Errors Detected: When an error is detected, the handling routine must call WinSetErrorInfo to post the condition. Error codes for conditions that the handling routine is expected to check include:
 * PMERR_BITMAP_NOT_SELECTED
 * PMERR_COORDINATE_OVERFLOW
 * PMERR_DEV_FUNC_NOT_INSTALLED
 * PMERR_HDC_BUSY
 * PMERR_INV_COLOR_DATA
 * PMERR_INV_COLOR_INDEX
 * PMERR_INV_COORD_SPACE
 * PMERR_INV_HDC
 * PMERR_INV_IN_AREA
 * PMERR_INV_IN_PATH
 * PMERR_INV_LENGTH_OR_COUNT
 * PMERR_INV_PICK_APERTURE_POSN
 * Refer to the "Error Explanations" section in the Presentation Manager Programming Reference for further explanation.

Remarks
GreDrawRLE is called by the area fill code in the graphics engine. The calling function uses the driver's CAPS_ADDITIONAL_GRAPHICS/CAPS_CLIP_FILLS field, which is queried during the first instance of DevOpenDC. If it is set, the data delivered to GreDrawRLE has already been clipped and the COM_PRECLIP flag will be set in the flag's WORD of the function number. All coordinates are passed as screen coordinates.

Sample Code

 * 1) define INCL_GRE_LINE
 * 2) include 

HDC       hdc;        /*  Device context handle. */ PRLEHDR   pRLEHDR;    /*  Pointer to run-length-encoding data header. */ PVOID     pInstance;  /*  Pointer to instance data. */ ULONG     lFunction;  /*  High-order WORD=flags; low-order WORD=NGreDrawRLE. */ ULONG     rc;         /*  Return codes. */

rc = GreDrawRLE(hdc, pRLEHDR, pInstance, lFunction); 