DLI Implementation and Reference Guide - Datalogics

11.4 DLI Implementation and Reference Guide
description of resolution (samples per inch horizontal and/or vertical). The stream
may be compressed, in which case the compression algorithm and parameters must
also be given.
Concepts and Facilities: Guide to the DL Pager Composition System
These images may be expressed at various levels, from something as simple as “Here
is a bitmap of n lines by n samples in 1-bit gray scale,” to more-complex references to
standards for graphics encoding and compression (e.g. JPEG/JPG, TIFF, GIF, PNG,
etc.). However, the Adobe PDF Library package contains no logic to transform
bitmaps, so they must all be presented to the Adobe PDF Library in a common
manner.
This excerpt from the graphical image example shows the logic for inserting a raw
bitmapped graphic into a document.
"C" Example: Bitmapped Graphic via dlpdfimagecreatefrombmp
/* Allocate memory to hold the image bitmap */
ImageString = malloc (ImageWidth * ImageDepth);
/* Open read the bitmap, and close the bitmap file */
ImageFile = fopen (ImageName, "rb");
fread (ImageString, 1, ImageWidth * ImageDepth, ImageFile);
fclose (ImageFile);
/* Get the color space DeviceGray as a COS object */
GraySpace = PDEColorSpaceCreateFromName (ASAtomFromString
("DeviceGray"));
PDEColorSpaceGetCosObj (GraySpace, &Color);
/* Create a DLPDFIMAGE object from the bitmap */
Image = dlpdfimagecreatefrombmp (Doc, "Bear", ImageString,
ImageDepth * ImageWidth,
ImageWidth, ImageDepth,
8, Color, FALSE);
/* Free the image string from memory */
free (ImageString);
/* "Paste" the image into the container, centered over the
* red box */
dlpdfcontentreferenceimage (Content, Image,
(fixedFour * 72) - ((Image->BBox.left + Image->BBox.right)/2),
(fixedFour * 72) - ((Image->BBox.top + Image->BBox.bottom)/2),
0, fixedOne, fixedOne);