Jump to content

GreMultiplyXforms: Difference between revisions

From EDM2
Created page with "GreMultiplyXforms multiplies the transform matrix. This function can be hooked by the presentation driver. ;Simulation support: This function is simulated by a handling ro..."
 
Ak120 (talk | contribs)
mNo edit summary
 
Line 1: Line 1:
GreMultiplyXforms multiplies the transform matrix.  
GreMultiplyXforms multiplies the transform matrix.


This function can be hooked by the presentation driver.  
This function can be hooked by the presentation driver.


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


==Syntax==
==Syntax==
  GreMultiplyXforms(hdc, paXform, paNewXformData, lMode, pInstance, lFunction);
  GreMultiplyXforms(hdc, paXform, paNewXformData, lMode, pInstance, lFunction)


==Parameters==
==Parameters==
;hdc (HDC) - input  
;hdc (HDC) - input:Device context handle.
:Device context handle.  
;paXform (PXFORM) - output:On input: Transform used during lMode operation.
 
:On output: Result of the lMode operation.
;paXform (PXFORM) - output  
;paNewXformData (PXFORM) - input:Transform used during lMode operation.
:On input: Transform used during lMode operation.  
;lMode (LONG) - input:Specifies how supplied array is used to set matrix:
 
:*SX_UNITY Set unity transform, ignore array values
:On output: Result of the lMode operation.  
:*SX_CAT_AFTER Concatenate after
 
:*SX_CAT_BEFORE Concatenate before
;paNewXformData (PXFORM) - input  
:*SX_OVERWRITE Overwrite
:Transform used during lMode operation.  
;pInstance (PVOID) - input:Pointer to instance data.
 
;lFunction (ULONG) - input:High-order WORD=flags; low-order WORD=NGreMultiplyXforms.
;lMode (LONG) - input  
:Specifies how supplied array is used to set matrix:  
 
:*SX_UNITY Set unity transform, ignore array values  
:*SX_CAT_AFTER Concatenate after  
:*SX_CAT_BEFORE Concatenate before  
:*SX_OVERWRITE Overwrite  
 
;pInstance (PVOID) - input  
:Pointer to instance data.  
 
;lFunction (ULONG) - input  
:High-order WORD=flags; low-order WORD=NGreMultiplyXforms.  


==Return Code==
==Return Code==
;fSuccess (BOOL) - returns  
;fSuccess (BOOL) - returns:Return codes.
:Return codes.  
:This function returns BOOLEAN (fSuccess).
 
:*TRUE Successful
:This function returns BOOLEAN (fSuccess).  
:*FALSE 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:
:*TRUE Successful  
:*PMERR_INV_MATRIX_ELEMENT
:*FALSE Error  
:*PMERR_INV_TRANSFORM_TYPE
 
:Refer to the "Error Explanations" section in the ''Presentation Manager Programming Reference'' for further explanation.
: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_INV_MATRIX_ELEMENT  
:*PMERR_INV_TRANSFORM_TYPE  
 
:Refer to the "Error Explanations" section in the Presentation Manager Programming Reference for further explanation.  


==Remarks==
==Remarks==
This function multiplies the transform matrix (defined by paNewXformData) by the corresponding matrix in paXform. The result is stored in paXform. When this function is used to make a series of matrix multiplications on the same matrix, some loss of accuracy can occur due to rounding because no higher precision can be retained across calls.  
This function multiplies the transform matrix (defined by paNewXformData) by the corresponding matrix in paXform. The result is stored in paXform. When this function is used to make a series of matrix multiplications on the same matrix, some loss of accuracy can occur due to rounding because no higher precision can be retained across calls.


==Declaration==
==Declaration==
Line 58: Line 39:
#include <os2.h>
#include <os2.h>


HDC      hdc;             /* Device context handle. */
HDC      hdc;           /* Device context handle. */
PXFORM    paXform;
PXFORM    paXform;
PXFORM    paNewXformData;
PXFORM    paNewXformData;
LONG      lMode;           /* Specifies how supplied array is used to set matrix: */
LONG      lMode;         /* Specifies how supplied array is used to set matrix: */
PVOID    pInstance;       /* Pointer to instance data. */
PVOID    pInstance;     /* Pointer to instance data. */
ULONG    lFunction;
ULONG    lFunction;
BOOL      fSuccess;       /* Return codes. */
BOOL      fSuccess;       /* Return codes. */
 
fSuccess = GreMultiplyXforms(hdc, paXform,
            paNewXformData, lMode, pInstance,
            lFunction);


fSuccess = GreMultiplyXforms(hdc, paXform, paNewXformData, lMode, pInstance, lFunction);
</PRE>
</PRE>


[[Category:Gre]]
[[Category:Gre]]

Latest revision as of 17:32, 7 February 2020

GreMultiplyXforms multiplies the transform matrix.

This function can be hooked by the presentation driver.

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

Syntax

GreMultiplyXforms(hdc, paXform, paNewXformData, lMode, pInstance, lFunction)

Parameters

hdc (HDC) - input
Device context handle.
paXform (PXFORM) - output
On input: Transform used during lMode operation.
On output: Result of the lMode operation.
paNewXformData (PXFORM) - input
Transform used during lMode operation.
lMode (LONG) - input
Specifies how supplied array is used to set matrix:
  • SX_UNITY Set unity transform, ignore array values
  • SX_CAT_AFTER Concatenate after
  • SX_CAT_BEFORE Concatenate before
  • SX_OVERWRITE Overwrite
pInstance (PVOID) - input
Pointer to instance data.
lFunction (ULONG) - input
High-order WORD=flags; low-order WORD=NGreMultiplyXforms.

Return Code

fSuccess (BOOL) - returns
Return codes.
This function returns BOOLEAN (fSuccess).
  • TRUE Successful
  • FALSE 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_INV_MATRIX_ELEMENT
  • PMERR_INV_TRANSFORM_TYPE
Refer to the "Error Explanations" section in the Presentation Manager Programming Reference for further explanation.

Remarks

This function multiplies the transform matrix (defined by paNewXformData) by the corresponding matrix in paXform. The result is stored in paXform. When this function is used to make a series of matrix multiplications on the same matrix, some loss of accuracy can occur due to rounding because no higher precision can be retained across calls.

Declaration

#define INCL_GRE_XFORMS
#include <os2.h>

HDC       hdc;            /* Device context handle. */
PXFORM    paXform;
PXFORM    paNewXformData;
LONG      lMode;          /* Specifies how supplied array is used to set matrix: */
PVOID     pInstance;      /* Pointer to instance data. */
ULONG     lFunction;
BOOL      fSuccess;       /* Return codes. */

fSuccess = GreMultiplyXforms(hdc, paXform, paNewXformData, lMode, pInstance, lFunction);