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diff --git a/gfx/cairo/cairo/src/cairo-win32-surface.c b/gfx/cairo/cairo/src/cairo-win32-surface.c
--- a/gfx/cairo/cairo/src/cairo-win32-surface.c
+++ b/gfx/cairo/cairo/src/cairo-win32-surface.c
@@ -928,16 +928,19 @@ _cairo_win32_surface_composite_inner (ca
return _composite_alpha_blend (dst, src, alpha,
src_r.x, src_r.y, src_r.width, src_r.height,
dst_r.x, dst_r.y, dst_r.width, dst_r.height);
}
return CAIRO_STATUS_SUCCESS;
}
+/* from pixman-private.h */
+#define MOD(a,b) ((a) < 0 ? ((b) - ((-(a) - 1) % (b))) - 1 : (a) % (b))
+
static cairo_int_status_t
_cairo_win32_surface_composite (cairo_operator_t op,
cairo_pattern_t *pattern,
cairo_pattern_t *mask_pattern,
void *abstract_dst,
int src_x,
int src_y,
int mask_x,
@@ -1209,18 +1212,18 @@ _cairo_win32_surface_composite (cairo_op
/* If we need to repeat, we turn the repeated blit into
* a bunch of piece-by-piece blits.
*/
if (needs_repeat) {
cairo_rectangle_int_t piece_src_r, piece_dst_r;
uint32_t rendered_width = 0, rendered_height = 0;
uint32_t to_render_height, to_render_width;
int32_t piece_x, piece_y;
- int32_t src_start_x = src_r.x % src_extents.width;
- int32_t src_start_y = src_r.y % src_extents.height;
+ int32_t src_start_x = MOD(src_r.x, src_extents.width);
+ int32_t src_start_y = MOD(src_r.y, src_extents.height);
if (needs_scale)
goto UNSUPPORTED;
/* If both the src and dest have an image, we may as well fall
* back, because it will be faster than our separate blits.
* Our blit code will be fastest when the src is a DDB and the
* destination is a DDB.
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