DLI Implementation and Reference Guide - Datalogics

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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);
Image Display 11.5 Graphical Language Forms These forms of graphics are described via line drawing operators, fill and stroke parameters, and text. They may also include bitmapped graphics. These forms exist solely in the context of a standard language definition (e.g. PDF: Portable Document Format; CGM: Computer Graphics Metafile; WMF: Windows Metafile Format; QuickDraw drawing commands; etc.). Image Creation Methods With the exception of PDF, for which this package is eminently suitable, all of the graphic forms must be converted into a stream of line drawing, imaging and text drawing commands before being used as an image. DLI supports creating graphical images from a range of sources via the following methods:
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