DLI Implementation and Reference Guide - Datalogics

11.12 DLI Implementation and Reference Guide
The parameter containing the graphic list file name is the DDName of the crossreference
file, as in:
Concepts and Facilities: Guide to the DL Pager Composition System
LoadGraphicList(“graphics”);
with the associated JCL line:
//GRAPHICS DD
DSN=ADOBE.PDFLIB.RESOURCE.GRPHLIST(GRPIDX),DISP=SHR
GetGraphicFromList
This method is available on OS/390 only. It accepts a DLPDFDOC pointer and graphic
key string, and returns the appropriate DLPDFIMAGE pointer. Multiple usage of the
same graphic key within a document is tracked by DLI, resulting in only one instance
of the graphic being placed in the document.
NOTE: The graphic key must be passed as an ASCII string.
Creating Transparent Graphics
A PDF file may contain imagemasks. These are images which are used to mask, or
block, the painting of areas beneath the mask, in the manner of a stencil. Imagemasks
are one-bit graphics, where a value of 0 means that the pixel beneath the image is not
to show through, and a value of 1 means that the pixel beneath is visible.
DLI will automatically set any bitmap image created with the
dlpdfimagecreatefrombmp function, having one bit per pixel and no color space
(a CosNull object for the ColorSpace parameter), to be an imagemask. The mask
will paint marked regions with the current fill color, and will leave unmarked regions
untouched; page marks below these regions will be visible and not painted over.
To change an image into a mask, simply insert the Imagemask key, with the value of
TRUE as a Boolean, into the image’s dictionary. Then, remove the ColorSpace key