tests: cover the winlib backend text drawing#152
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Adds a text drawing test for the win32 GDI graphics backend. Drawing a string paints some black glyph pixels without covering the whole image, and a larger point size paints more glyph pixels than a smaller one, which exercises WIN32FontInfo glyph drawing through the TextOutW path. The glyph shapes are font dependent, so the checks count dark pixels. It builds only for the winlib graphics backend and skips when the backend cannot be reached, so it is inert on the other backends and in CI.
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Adds a text drawing test for the win32 GDI graphics backend.
Drawing a string paints some black glyph pixels without covering the whole
image, and a larger point size paints more glyph pixels than a smaller one,
which exercises WIN32FontInfo glyph drawing through the TextOutW path. The
glyph shapes are font dependent, so the checks count dark pixels.
It builds only for the winlib graphics backend and skips when the backend cannot
be reached, so it is inert on the other backends and in CI.