Kontron KTAM3874-pITX - Manual (Page 155)

KTD-S0057-I Page 151 Linux® Programming Examples (DebianTM)
KTAM3874/pITX Software Guide
When using static libraries there is one limitation: the gradient feature does not work.
The time has come to explain the PDF, PostScript ® and SVG-file surface programming. It would seem that
the Include-file selection will have a special significance. The following table gives an overview:
Surface Only use the Include-file
X11 TM cairo/cairo.h
PDF cairo/cairo-pdf.h
PostScript ® cairo/cairo-ps.h
SVG-file cairo/cairo-svg.h
For example if you want to use the PostScript ® surface and you only integrate the cairo.h file the appli-
cation generates an empty PS-file (however, the header part is present). The demonstration program also
involves the X Server
TM for color definition but without displaying a window on the monitor. Another major
difference affects the surface size. The X11 TM environment needs the use of pixel, but PDF, PostScript ® and
SVG 1/72 inch (72 DPI). Within the Cairo sourcecode package you can find the following extract:
static const cairo_page_standard_media_t _cairo_page_standard_media[] =
{
{ "A0", 2384, 3371 },
{ "A1", 1685, 2384 },
{ "A2", 1190, 1684 },
{ "A3", 842, 1190 },
{ "A4", 595, 842 },
{ "A5", 420, 595 },
{ "B4", 729, 1032 },
{ "B5", 516, 729 },
{ "Letter", 612, 792 },
{ "Tabloid", 792, 1224 },
{ "Ledger", 1224, 792 },
{ "Legal", 612, 1008 },
{ "Statement", 396, 612 },
{ "Executive", 540, 720 },
{ "Folio", 612, 936 },
{ "Quarto", 610, 780 },
{ "10x14", 720, 1008 },
};
Calculation example for A4 format (1 inch = 25,4 mm):
(595 / 72) * 25.4 = 209.903 [mm]
(842 / 72) * 25.4 = 297,04 [mm]
Following sourcecode generates a PDF file (A4 format) with two pictures: