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Commit 97a0dc0 adjusted the backing surface size based on the GTK window scale, and used cairo_scale so that drawing code is oblivious to this. The blitter operates on the underlying pixels and so should account for the scaling, but no code was added for this. Now we multiply the blitter dimensions by the window scale, scale the pixel coordinates to save from, and set the scaling factor to 1:1 when loading. This fixes rendering artefacts with "GDK_SCALE=2", or when using display scaling with Wayland. Also adjust the backing surface position in draw_area so that it is centered properly.
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/>.