GreUpdateColors: Difference between revisions
Created page with "GreUpdateColors causes a pel-by-pel remapping of the Device Context's visible area on the screen. This function can be hooked by the presentation driver. ;Simulation suppo..." |
mNo edit summary |
||
| Line 1: | Line 1: | ||
GreUpdateColors causes a pel-by-pel remapping of the Device Context's visible area on the screen. | GreUpdateColors causes a pel-by-pel remapping of the Device Context's visible area on the screen. | ||
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 Revision 2.0 (or later) of the graphics engine. | ;Simulation support: This function is simulated by a handling routine in Revision 2.0 (or later) of the graphics engine. | ||
== Syntax == | == Syntax == | ||
GreUpdateColors(hdc, pInstance, lFunction) | GreUpdateColors(hdc, pInstance, lFunction) | ||
== Parameters == | == Parameters == | ||
;hdc (HDC) - input | ;hdc (HDC) - input:Device context handle. | ||
:Device context handle. | ;pInstance (PVOID) - input:Pointer to instance data. | ||
;lFunction (ULONG) - input:High-order WORD=flags; low-order WORD=NGreUpdateColor. | |||
;pInstance (PVOID) - input | |||
:Pointer to instance data. | |||
;lFunction (ULONG) - input | |||
:High-order WORD=flags; low-order WORD=NGreUpdateColor. | |||
== Returns == | == Returns == | ||
;rc (BOOL) - returns | ;rc (BOOL) - returns:Return codes. | ||
:Return codes. | |||
:On completion, this function returns the following values: | :On completion, this function returns the following values: | ||
::Error (0) | |||
:Error (0) | ::Successful (1) | ||
:Successful (1) | :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_IN_AREA | |||
:Possible Errors Detected: | :PMERR_INV_IN_PATH | ||
:Refer to the "Error Explanations" section in the Presentation Manager Programming Reference for further explanation. | |||
:PMERR_INV_IN_AREA | |||
:PMERR_INV_IN_PATH | |||
:Refer to the "Error Explanations" section in the Presentation Manager Programming Reference for further explanation. | |||
== Remarks == | == Remarks == | ||
This function causes a pel-by-pel remapping of the hardware palette indexes for the DC's visible area on the screen. This function call indicates that the window colors might have changed to incorrect colors if the window is in the background. By calling GreUpdateColors, the pels are changed to the color in the current physical palette that comes closest to the desired color. | This function causes a pel-by-pel remapping of the hardware palette indexes for the DC's visible area on the screen. This function call indicates that the window colors might have changed to incorrect colors if the window is in the background. By calling GreUpdateColors, the pels are changed to the color in the current physical palette that comes closest to the desired color. | ||
[[Category:Gre]] | [[Category:Gre]] | ||
Latest revision as of 23:18, 17 January 2020
GreUpdateColors causes a pel-by-pel remapping of the Device Context's visible area on the screen.
This function can be hooked by the presentation driver.
- Simulation support
- This function is simulated by a handling routine in Revision 2.0 (or later) of the graphics engine.
Syntax
GreUpdateColors(hdc, pInstance, lFunction)
Parameters
- hdc (HDC) - input
- Device context handle.
- pInstance (PVOID) - input
- Pointer to instance data.
- lFunction (ULONG) - input
- High-order WORD=flags; low-order WORD=NGreUpdateColor.
Returns
- rc (BOOL) - returns
- Return codes.
- On completion, this function returns the following values:
- Error (0)
- Successful (1)
- 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_IN_AREA
- PMERR_INV_IN_PATH
- Refer to the "Error Explanations" section in the Presentation Manager Programming Reference for further explanation.
Remarks
This function causes a pel-by-pel remapping of the hardware palette indexes for the DC's visible area on the screen. This function call indicates that the window colors might have changed to incorrect colors if the window is in the background. By calling GreUpdateColors, the pels are changed to the color in the current physical palette that comes closest to the desired color.