<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> </head> <body bgcolor="#FFFFFF" text="#000000"> It is important to know which version of cairo I am using. The sample I posted earlier is run on cairo-1.14.8-2.el7.x86_64on RHEL7.5 The problem appeared only with the update of Redhat Linux from RHEL6 to RHEL7. If I run the samples on the old machine, which has cairo-1.10.2-1.el6.x86_64, the fonts scale properly: <tt>[alois@as81 devlop]$ ctest1</tt><tt> bitmap surface </tt><tt>9.0 pt on Size: 45x7 9.0 pt off Size: 45.7764x7</tt><tt> </tt><tt>9.1 pt on Size: 45x7 9.1 pt off Size: 46.222x7</tt><tt> </tt><tt>9.2 pt on Size: 45x7 9.2 pt off Size: 46.7418x7</tt><tt> </tt><tt>9.3 pt on Size: 46x7 9.3 pt off Size: 47.1874x7</tt><tt> </tt><tt>9.4 pt on Size: 46x7 9.4 pt off Size: 47.7072x7</tt><tt> </tt><tt>9.5 pt on Size: 46x7 9.5 pt off Size: 48.1528x7</tt><tt> </tt><tt>9.6 pt on Size: 46x8 9.6 pt off Size: 48.5984x8</tt><tt> </tt><tt>9.7 pt on Size: 46x8 9.7 pt off Size: 49.1183x8</tt><tt> </tt><tt>9.8 pt on Size: 48x8 9.8 pt off Size: 49.5639x8</tt><tt> </tt><tt>9.9 pt on Size: 53x8 9.9 pt off Size: 50.0837x8</tt><tt> </tt><tt>10.0 pt on Size: 55x8 10.0 pt off Size: 50.5293x8</tt> <tt>[alois@as81 devlop]$ ctest2</tt><tt> PDF surface </tt><tt>9.0 pt on Size: 45.4951x6.8125 9.0 pt off Size: 45.4951x6.8125</tt><tt> </tt><tt>9.1 pt on Size: 45.9407x6.8125 9.1 pt off Size: 45.9407x6.8125</tt><tt> </tt><tt>9.2 pt on Size: 46.4606x6.8125 9.2 pt off Size: 46.4606x6.8125</tt><tt> </tt><tt>9.3 pt on Size: 46.9062x6.8125 9.3 pt off Size: 46.9062x6.8125</tt><tt> </tt><tt>9.4 pt on Size: 47.426x6.8125 9.4 pt off Size: 47.426x6.8125</tt><tt> </tt><tt>9.5 pt on Size: 48.1841x7.5625 9.5 pt off Size: 48.1841x7.5625</tt><tt> </tt><tt>9.6 pt on Size: 48.6297x7.5625 9.6 pt off Size: 48.6297x7.5625</tt><tt> </tt><tt>9.7 pt on Size: 49.1496x7.5625 9.7 pt off Size: 49.1496x7.5625</tt><tt> </tt><tt>9.8 pt on Size: 49.5951x7.5625 9.8 pt off Size: 49.5951x7.5625</tt><tt> </tt><tt>9.9 pt on Size: 50.115x7.5625 9.9 pt off Size: 50.115x7.5625</tt><tt> </tt><tt>10.0 pt on Size: 50.5605x7.5625 10.0 pt off Size: 50.5605x7.5625</tt> What happened between cairo 1.10 and cairo 1.14 to cause this issue? <div class="moz-cite-prefix">On 29.09.18 10:57, Alois Treindl wrote: </div> <blockquote type="cite" cite="mid:97838e87-6f54-815e-fe52-762e4f4fed5c@astro.ch">sorry, sent html message again which this list dos not accept. I send a second time. ---- I added font size changes to the example, and print extents with metric on and off. The problem which I am addressing appears: font size changes only in steps. 9.0 pt on Size: 49x7 9.0 pt off Size: 45.7764x7 9.1 pt on Size: 49x7 9.1 pt off Size: 45.7764x7 9.2 pt on Size: 49x7 9.2 pt off Size: 45.7764x7 9.3 pt on Size: 49x7 9.3 pt off Size: 45.7764x7 9.4 pt on Size: 49x7 9.4 pt off Size: 45.7764x7 9.5 pt on Size: 51x7 9.5 pt off Size: 50.5293x7 9.6 pt on Size: 51x7 9.6 pt off Size: 50.5293x7 9.7 pt on Size: 51x7 9.7 pt off Size: 50.5293x7 9.8 pt on Size: 51x7 9.8 pt off Size: 50.5293x7 9.9 pt on Size: 51x7 9.9 pt off Size: 50.5293x7 10.0 pt on Size: 51x7 10.0 pt off Size: 50.5293x7 I ran also the same example but with PDF surface, and get as output: ctest2 9.0 pt on Size: 45.4951x6.8125 9.0 pt off Size: 45.4951x6.8125 9.1 pt on Size: 45.4951x6.8125 9.1 pt off Size: 45.4951x6.8125 9.2 pt on Size: 45.4951x6.8125 9.2 pt off Size: 45.4951x6.8125 9.3 pt on Size: 45.4951x6.8125 9.3 pt off Size: 45.4951x6.8125 9.4 pt on Size: 45.4951x6.8125 9.4 pt off Size: 45.4951x6.8125 9.5 pt on Size: 50.5605x7.5625 9.5 pt off Size: 50.5605x7.5625 9.6 pt on Size: 50.5605x7.5625 9.6 pt off Size: 50.5605x7.5625 9.7 pt on Size: 50.5605x7.5625 9.7 pt off Size: 50.5605x7.5625 9.8 pt on Size: 50.5605x7.5625 9.8 pt off Size: 50.5605x7.5625 9.9 pt on Size: 50.5605x7.5625 9.9 pt off Size: 50.5605x7.5625 10.0 pt on Size: 50.5605x7.5625 10.0 pt off Size: 50.5605x7.5625 with PDF, metrics on or off makes no difference. But the font size changes are in steps. On 29.09.18 08:12, Uli Schlachter wrote: <blockquote type="cite">Hi, On 28.09.2018 14:10, Alois Treindl wrote: <blockquote type="cite">I noticed that cairo does not allow me to set a precise font size, like 9.4 pt or 9.7 pt. What I get is exactly the same font size, for a range of font sizes. </blockquote> Try disabling metrics hinting via CAIRO_HINT_METRICS_OFF. See the attached example program. Per the docs, this metrics hinting quantizises font metrics so that they are integer values in device space, i.e. does exactly what you are trying to get rid of. You might also want to do cairo_font_options_set_hint_style(opt, CAIRO_HINT_STYLE_NONE), depending on, well, if you want the font outlines to be hinted or not. Cheers, Uli </blockquote> <fieldset class="mimeAttachmentHeader"></fieldset> </blockquote> </body> </html>