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Compute device_transform_inverse.

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Because we can independently set either the device scale or the device
offset, we need to be careful and recompute the inverse rather than simply
assuming that the original contents of the device transform is identity.

Fixes regression https://bugs.launchpad.net/inkscape/+bug/234546.
This commit is contained in:
Chris Wilson 2008-09-28 15:57:37 +01:00
parent 9841d9d58e
commit 3c18d95b29
1 changed files with 4 additions and 6 deletions
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10
src/cairo-surface.c
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@ -811,10 +811,8 @@ _cairo_surface_set_device_scale (cairo_surface_t *surface,
surface->device_transform.xy = 0.0;
surface->device_transform.yx = 0.0;
surface->device_transform_inverse.xx = 1.0 / sx;
surface->device_transform_inverse.yy = 1.0 / sy;
surface->device_transform_inverse.xy = 0.0;
surface->device_transform_inverse.yx = 0.0;
surface->device_transform_inverse = surface->device_transform;
cairo_matrix_invert (&surface->device_transform_inverse);
}
/**
@ -855,8 +853,8 @@ cairo_surface_set_device_offset (cairo_surface_t *surface,
surface->device_transform.x0 = x_offset;
surface->device_transform.y0 = y_offset;
surface->device_transform_inverse.x0 = - x_offset;
surface->device_transform_inverse.y0 = - y_offset;
surface->device_transform_inverse = surface->device_transform;
cairo_matrix_invert (&surface->device_transform_inverse);
}
slim_hidden_def (cairo_surface_set_device_offset);