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The device pixel ratio indicates how many physical pixels there are in the platonic ideal of a pixel, at least approximately. In Web browsers, the device pixel ratio is used to represent "retina" displays with particularly high pixel densities, and also to reflect user-driven zooming of the page to different text sizes. The mid-end uses the device pixel ratio to adjust the tile size at startup, and can also respond to changes in device pixel ratio by adjusting the time size later. This is accomplished through a new argument to midend_size() which can simply be passed as 1.0 in any front end that doesn't care about this.
This is the README accompanying the source code to Simon Tatham's puzzle collection. The collection's web site is at <https://www.chiark.greenend.org.uk/~sgtatham/puzzles/>. The puzzle collection is built using CMake <https://cmake.org/>. To compile in the simplest way (on any of Linux, Windows or Mac), run these commands in the source directory: cmake . cmake --build . The manual is provided in Windows Help format for the Windows build; in text format for anyone who needs it; and in HTML for the Mac OS X application and for the web site. It is generated from a Halibut source file (puzzles.but), which is the preferred form for modification. To generate the manual in other formats, rebuild it, or learn about Halibut, visit the Halibut website at <https://www.chiark.greenend.org.uk/~sgtatham/halibut/>.