At first,i do not understand that if there should return a negative value when i call this fuction with a negative parameter. When I draw a image with a large Scale(140,4) and large offset(relative to the origin),i find this fuction allways return a large positive value,and then the program run at fuction pixman_transform_point(), it will return FALSE,so this image do not paint.
_cairo_fixed_16_16_from_double error?
A similar issue is described here in https://bugs.freedesktop.org/show_bug.cgi?id=20091 Pixman restricts its input to 16.16 fixed point, so the pixman-based backends (image, xlib, xcb) currently fail to produce the correct output when using big input paths. The correct approach would be to keep the path with arbitrary precision, then clip it before rasterizing/passing it to pixman.
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