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