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* clutter/cogl/gles/cogl-primitives.c: (_cogl_path_fill_nodes):

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keep track of direction we are drawing in and make sure we leave
two intersection points when we have changed direction.
This commit is contained in:
Øyvind Kolås 2008-04-30 21:48:47 +00:00
parent 97b3499c52
commit 0b7cab090c
1 changed files with 20 additions and 2 deletions
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22
gles/cogl-primitives.c
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@ -254,6 +254,8 @@ _cogl_path_fill_nodes ()
gint prev_y; gint prev_y;
gint first_x; gint first_x;
gint first_y; gint first_y;
gint lastdir=-2; /* last direction we vere moving */
gint lastline=-1; /* the previous scanline we added to */
/* clear scanline intersection lists */ /* clear scanline intersection lists */
for (i=0; i < bounds_h; i++) for (i=0; i < bounds_h; i++)
@ -278,14 +280,21 @@ fill_close:
if (dy < 0) if (dy < 0)
ydir = -1; ydir = -1;
else else if (dy > 0)
ydir = 1; ydir = 1;
else
ydir = 0;
/* do linear interpolation between vertexes */ /* do linear interpolation between vertexes */
for (y=prev_y; y!= dest_y; y += ydir) for (y=prev_y; y!= dest_y; y += ydir)
{ {
/* only add a point if the scanline has changed and we're
* within bounds.
*/
if (y-bounds_y >= 0 && if (y-bounds_y >= 0 &&
y-bounds_y < bounds_h) y-bounds_y < bounds_h &&
lastline != y)
{ {
gint x = prev_x + (dx * (y-prev_y)) / dy; gint x = prev_x + (dx * (y-prev_y)) / dy;
@ -293,6 +302,15 @@ fill_close:
g_slist_insert_sorted (scanlines[ y - bounds_y], g_slist_insert_sorted (scanlines[ y - bounds_y],
GINT_TO_POINTER(x), GINT_TO_POINTER(x),
compare_ints); compare_ints);
if (ydir != lastdir && /* add a double entry when changing */
lastdir!=-2) /* vertical direction */
scanlines[ y - bounds_y ]=
g_slist_insert_sorted (scanlines[ y - bounds_y],
GINT_TO_POINTER(x),
compare_ints);
lastdir = ydir;
lastline = y;
} }
} }