The QFontDatabase class provides information about the fonts available in the underlying window system. The most common uses of this class are to query the database for the list of font families and for the pointSizes and styles that are available for each family. An alternative to pointSizes is smoothSizes which returns the sizes at which a given family and style will look attractive.
If the font family is available from two or more foundries the foundry name is included in the family name; for example: "Helvetica [Adobe]" and "Helvetica [Cronyx]". When you specify a family, you can either use the old hyphenated "foundry-family" format or the bracketed "family [foundry]" format; for example: "Cronyx-Helvetica" or "Helvetica [Cronyx]".
If the family has a foundry it is always returned using the bracketed format, as is the case with the value returned by families. The font function returns a QFont given a family, style and point size. A family and style combination can be checked to see if it is italic or boldand to retrieve its weight. Use the styleString to obtain a text version of a style. The QFontDatabase class also supports some static functions, for example, standardSizes. You can retrieve the description of a writing system using writingSystemNameand a sample of characters in a writing system with writingSystemSample.
This example gets the list of font families, the list of styles for each family, and the point sizes that are available for each combination of family and style, displaying this information in a tree view. Loads the font from the file specified by fileName and makes it available to the application. An ID is returned that can be used to remove the font again with removeApplicationFont or to retrieve the list of family names contained in the font.
Loads the font from binary data specified by fontData and makes it available to the application. Returns true if the font that has family family and style style is bold; otherwise returns false. See also italic and weight. If a family exists in several foundries, the returned name for that font is in the form "family [foundry]".
Returns a QFont object that has family familystyle style and point size pointSize. If no matching font could be created, a QFont object that uses the application's default font is returned.Submitted by Joshua Caldwell on Wed, Printer-friendly version PDF version Many fonts are included for use in Qt both in the Virtual Machine and on the displays but many users will want to add their own custom fonts to their user interface or add fonts in other langauges.
If you are using a font in the Virtual Machine and it looks different then on the display it is possible the font is not included on the display and needs to be loaded.
In which case you can follow the instructions below to load the correct font. First, if the font is not included in the Virtual Machine it will need to be loaded into the virtual machine.
C++ Qt 5 - Displaying Windows
This will also mean it will not be included in the display. Once the font is loaded onto the Virtual Machine you should now see the font appear as an option for label type objects in your Qt applicatoin.
If you select the newly added font it should appear correctly in your Qt User Interface design window and if you build and run your application in the Virtual Machine the new font should appear correctly.
If you build and run your application on the display, however, you will not see your font appear and will instead see a default display font. This is because the font is not loaded onto the display. Skip to main content. Product information Contact Support.
Log in. Adding custom fonts to Qt display and Virtual Machine. Submitted by Joshua Caldwell on Wed, Printer-friendly version PDF version Many fonts are included for use in Qt both in the Virtual Machine and on the displays but many users will want to add their own custom fonts to their user interface or add fonts in other langauges.
Qt for Embedded Linux Fonts
To load into the virtual machine: Download or aquire the font file. These usually come in. It should ask for the password to 'ccs'.
However, if I install qtconfig-qt4 using aptitude, the fonts rendered in that application look great and there are loads more fonts available. The settings however are not applied to my qt applications. I have no idea where qtconfig is picking up the font settings it makes available nor where it is saving the settings. The qt docs don't seem to help as far as I can see. If someone could help me with either setting up the qtconfig in my install maybe I need to configure with some different options - I used -debug-and-release -fast -qt-libtiff -no-webkit?
I would prefer the former!
Had a similar issue where qtconfig doesn't seem to be picking up the system fonts. Found some settings in kubuntu under appearance - fonts where I changed "use anti-aliasing" to enabled from system and then when configured I enabled "use sub-pixel rendering". Learn more. Asked 8 years, 10 months ago. Active 7 years, 8 months ago. Viewed 2k times. Active Oldest Votes. Still haven't figured out how to get all the fonts to appear in qtconfig though. Florent Justin Justin 21 2 2 bronze badges.
Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog.Qt for Embedded Linux uses the FreeType 2 font engine to produce font output.
The formats supported depends on the locally installed version of the FreeType library. Several of the formats may be rendered using anti-aliasing for improved readability. Qt for Embedded Linux will automatically detect prerendered fonts and TrueType fonts. Support for other font formats can be added. See the Fine-Tuning Features in Qt documentation for details. All supported fonts use the Unicode character encoding.
[Windows 10] Qt cannot find system fonts from their new location in Windows update 1809
Most fonts available today do, but they usually don't contain all the Unicode characters. A complete point Unicode font uses over 1 MB of memory. It is possible to add modules to the FreeType 2 font engine to support other types of font files. Glyphs rendered using FreeType are shared efficiently between applications, reducing memory requirements and speeding up text rendering. Nokia provides the cross-platform makeqpf tool, included in the tools directory of both Qt and Qt for Embedded Linuxwhich allows generation of QPF2 files from system fonts.
QPF2 supports anti-aliasing and complex writing systems, using information from the corresponding TrueType font, if present on the system. The format is designed to be mapped directly to memory. The same format is used to share glyphs from non-prerendered fonts between applications. Nokia provides support for the legacy QPF format for compatibility reasons. For compatibility reasons Qt for Embedded Linux supports the fontdir file, if present.
The file defines additional fonts available to the application, and has the following format:. Documentation contributions included herein are the copyrights of their respective owners.
But the character cannot be displayed correctly. I found it very useful to get a list of all the fonts actually detected by QWS and of their features. Learn more. Ask Question. Asked 6 years, 11 months ago.
Active 2 years, 11 months ago. Viewed 11k times. I'm using QT-4 embedded-linux. So i'm thinking that the problem is the about the path in which QT looks for a specific fonts. Active Oldest Votes. I experienced issues like this when using Qt for Embedded Linux.
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Upcoming Events. Featured on Meta. Feedback post: New moderator reinstatement and appeal process revisions. The new moderator agreement is now live for moderators to accept across the…. Allow bountied questions to be closed by regular users. Linked 2.The QFont class specifies a query for a font used for drawing text. More …. QFont can be regarded as a query for one or more fonts on the system. When you create a QFont object you specify various attributes that you want the font to have.
Qt will use the font with the specified attributes, or if no matching font exists, Qt will use the closest matching installed font. The attributes of the font that is actually used are retrievable from a QFontInfo object.
If the window system provides an exact match exactMatch returns true. Use QFontMetricsF to get measurements, e. Attributes which are not specifically set will not affect the font selection algorithm, and default values will be preferred instead. To load a specific physical font, typically represented by a single file, use QRawFont instead. If a chosen font does not include all the characters that need to be displayed, QFont will try to find the characters in the nearest equivalent fonts.
When a QPainter draws a character from a font the QFont will report whether or not it has the character; if it does not, QPainter will draw an unfilled square.
The attributes set in the constructor can also be set later, e. The remaining attributes must be set after contstruction, e. The actual values are available from a QFontInfo object.
If the requested font family is unavailable you can influence the font matching algorithm by choosing a particular StyleHint and StyleStrategy with setStyleHint. The default family corresponding to the current style hint is returned by defaultFamily. You can provide substitutions for font family names using insertSubstitution and insertSubstitutions.
Substitutions can be removed with removeSubstitutions. After substituting a font, you must trigger the updating of the font by destroying and re-creating all QFont objects.
Every QFont has a key which you can use, for example, as the key in a cache or dictionary. It is possible to set the height of characters shown on the screen to a specified number of pixels with setPixelSize ; however using setPointSize has a similar effect and provides device independence.
Loading fonts can be expensive, especially on X QFont contains extensive optimizations to make the copying of QFont objects fast, and to cache the results of the slow window system functions it depends upon. The specified font families set by setFamilies are searched for. If not found, then if set the specified font family exists and can be used to represent the writing system in use, it will be selected.
If not, a replacement font that supports the writing system is selected. The font matching algorithm will try to find the best match for all the properties set in the QFont. How this is done varies from platform to platform.
If the selected font, though supporting the writing system in general, is missing glyphs for one or more specific characters, then Qt will try to find a fallback font for this or these particular characters.
But if I try to set the font, to some basic font types eg Courier, Time New Roman, such fonts are shown properly in my application. I am using Qt3. Basically my problem is that, with the default font, Japanese characters are not rendered correctly, shows boxes.
Adding custom fonts to Qt (display and Virtual Machine)
Hence I am looking for something similar in Linux. Migrating entire code to new version is a huge task, and need lot of time, and knowledge of existing code.
After that, I was able to see those font on FireFox browser setting, but, when I try to use them in my Qt application, these fonts are not considered. The list of fonts obtained were totally different, from what is shown by fontconfig. Then compared the fonts listed by this command with the fonts option shown in GEDIT, openoffice, firefox, and the list was same. So, does Qt 3. Hence it will take the fonts which are installed in core X.
Qt Forum. Using Linux fonts for Qt application[solved] This topic has been deleted. Only users with topic management privileges can see it. Reply Quote 0 1 Reply Last reply. Hi, very very old Qt version Hello, Thanks for quick response. Well, I am new to Qt.