Hi, I've isolated what I think must be a bug in cairo with antialiasing.  In this snippet of code I set an initial matrix, apply a clipping path, set a new matrix and then draw a rectangle.  This rectangle is clipped away entirely, however **only** when antialiasing is set to CAIRO_ANTIALIAS_NONE.  If you comment out the line of code setting the antialiasing the rectangle is (correctly) not clipped away. This is using version 1.6.4 of cairo.     cairo_surface_t *lSurface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32,3802,2146);     unsigned char *lBuffer = cairo_image_surface_get_data(lSurface);     memset(lBuffer,255,3802*2146*4);     cairo_t *lStatus = cairo_create(lSurface);     cairo_set_antialias(lStatus,CAIRO_ANTIALIAS_NONE);     cairo_matrix_t lMatrix1;     cairo_matrix_init(&lMatrix1,65.0304,0,0,65.0304,-5540,432.90443136);     cairo_transform(lStatus,&lMatrix1);     cairo_new_path(lStatus);     cairo_rectangle(lStatus,85.1911,0.00168997,730.813,922.432);     cairo_clip(lStatus);         cairo_matrix_t lMatrix9;     cairo_matrix_init(&lMatrix9,0.268657,0,0,0.268657,105.604903,0.985497);     cairo_transform(lStatus,&lMatrix9);     cairo_rectangle(lStatus,-0.23,0.5,103.67,65.3);     cairo_set_source_rgba(lStatus,0,0,1,1);     cairo_fill_preserve(lStatus);     cairo_surface_flush(lSurface); Thanks, Best regards, Kristof