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drm/i915: Fix crash with linear-step-function

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Avoid the potential divide by zero by falling back to pixman rendered
gradient textures for such troublesome input.
This commit is contained in:
Chris Wilson 2010-03-03 21:25:11 +00:00
parent 404ead7eeb
commit 5b973c6708
1 changed files with 11 additions and 6 deletions
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17
src/drm/cairo-drm-i915-shader.c
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@ -985,7 +985,7 @@ i915_set_shader_program (i915_device_t *device,
FS_END ();
}
static void
static cairo_bool_t
i915_shader_linear_init (struct i915_shader_linear *l,
const cairo_linear_pattern_t *linear)
{
@ -994,9 +994,12 @@ i915_shader_linear_init (struct i915_shader_linear *l,
dx = _cairo_fixed_to_double (linear->p2.x - linear->p1.x);
dy = _cairo_fixed_to_double (linear->p2.y - linear->p1.y);
sf = 1. / (dx * dx + dy * dy);
dx *= sf;
dy *= sf;
sf = dx * dx + dy * dy;
if (sf <= 1e-5)
return FALSE;
dx /= sf;
dy /= sf;
x0 = _cairo_fixed_to_double (linear->p1.x);
y0 = _cairo_fixed_to_double (linear->p1.y);
@ -1015,6 +1018,8 @@ i915_shader_linear_init (struct i915_shader_linear *l,
l->dy = m.xy;
l->offset = m.x0;
}
return TRUE;
}
static cairo_bool_t
@ -1130,8 +1135,8 @@ i915_shader_acquire_linear (i915_shader_t *shader,
cairo_bool_t mode = LINEAR_TEXTURE;
cairo_status_t status;
i915_shader_linear_init (&src->linear, linear);
if (linear->base.n_stops == 2 &&
if (i915_shader_linear_init (&src->linear, linear) &&
linear->base.n_stops == 2 &&
linear->base.stops[0].offset == 0.0 &&
linear->base.stops[1].offset == 1.0)
{