Whether the Universal Printer Driver should strip leading, embedded, and trailing blanks from the bitmap data prior to sending the data to the printer.The fBlockOut dialog box contains controls which specify how the Universal Printer Driver formats each block of raster-graphic data to be sent to the printer. A block is defined as having a height of n scan lines where n is equal to the sNPins control. (For more information about the sNPins control, see Section 6.1.6, “Number of Pins.”) The fBlockOut dialog box controls the following bits:
Whether the Universal Printer Driver should strip leading, embedded, and trailing blanks from the bitmap data prior to sending the data to the printer.
Whether the Universal Printer Driver needs to reset the currently selected device font after printing bitmap data.
Whether the printer requires undirectional printing with the specified resolution.
Whether the printer cannot fire adjacent pins in the print head.
Whether the Universal Printer Driver needs to reset the raster data-compression mode after printing bitmap data.
Whether the minidriver provides a callback function which alters bitmap data prior to printing.
The following illustration shows the fBlockOut dialog box:
The following list briefly describes the controls in the fBlockOut dialog box.
| Control | Description |
| RES_BO_LEADING_BLNKS | Specifies that the Universal Printer Driver should strip any leading, non-printing graphic data from the beginning of each block of raster data sent to the printer. |
| RES_BO_TRAILING_BLNKS | Specifies that the Universal Printer Driver should strip any trailing, nonprinting graphic data from the end of each block of raster data sent to the printer. |
| RES_BO_ENCLOSED_BLNKS | Specifies that the Universal Printer Driver should strip any enclosed, nonprinting graphic data from anywhere within each block of raster data sent to the printer, if the number of bytes of nonprinting raster data exceeds that value listed in the sMinBlankSkip control in the RESOLUTION dialog box. |
| RES_BO_RESET_FONT | Specifies that the Universal Printer Driver should reset the currently selected device font after printing a block of raster-bitmap data. |
| RES_BO_UNIDIR | Specifies that the Universal Printer Driver should enable unidirectional printing, from the data in the CURSORMOVE dialog box, when using this resolution. Some printers require this for correct horizontal alignment of output. |
| RES_BO_NO_ADJACENT | Specifies that the Universal Printer Driver should be aware that vertically adjacent pins on the print head may not be fired simultaneously. |
| RES_BO_RESET_CMP | Specifies that the Universal Printer Driver should reset the raster data-compression mode after entering graphics mode. |
| RES_BO_CB_FILTER_GRX | Specifies that the Universal Printer Driver should use code provided by the driver to alter raster graphic data. |
Note:
The term “strip” raster graphics data means that Universal Printer Driver will substitute available cursor-movement commands in place of nonprinting raster-graphic data. This usually results in a performance gain because cursor-movement commands typically require less data when sent to the printer. Most printers will benefit from using the RES_BO_TRAILING_BLNKS bit. However, due to differences in the resolutions of cursor-movement commands and graphics resolutions, care must be exercised when using the RES_BO_LEADING_BLNKS and RES_BO_ENCLOSED_BLNKS bits to ensure that horizontal misalignment of graphic output does not occur.
For the Diconix 150 Plus printer, the RES_BO_TRAILING_BLNKS box is checked in order to delete trailing blanks from a bitmap. However, the RES_BO_LEADING_BLNKS and RES_BO_ENCLOSED_BLNKS boxes are not checked because the available methods of moving the cursor do provide a high enough degree of accuracy.
For the HP LaserJet IIP printer, the RES_BO_ENCLOSED_BLNKS box is checked in order to delete blanks enclosed in the bitmap. The RES_BO_TRAILING_BLNKS box is also checked in order to delete trailing blanks from a bitmap. However, the RES_BO_LEADING_BLNKS box is not checked. (The performance of HP PCL minidrivers is significantly reduced when this box is checked and the Universal Printer Driver removes leading blanks from a bitmap.)