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If the puzzle canvas is at a ludicrously small size, so that you attempt to use a zero-height font, then obviously nothing sensible will appear in the way of text, but you'd at least like to avoid a crash. But currently, js_canvas_find_font_midpoint will make a canvas, print some height-0 text into it, and try to retrieve the image pixels to see what the actual font height was - and this will involve asking getImageData for a zero-sized rectangle of pixels, which is an error. Of course, there's only one possible return value from this function if the font height is 0, so we can just return it without going via getImageData at all. (This crash can be provoked by trying to resize the puzzle canvas to Far Too Small, or by interleaving canvas resizes with browser-tab zooming. I've had one report that it also occurs in less silly situations, which I haven't been able to reproduce. However, this seems like a general improvement anyway.)
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/>.