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gdi32: Add a helper function for drawing multiple line segments.

This commit is contained in:
Alexandre Julliard 2012-01-04 16:06:01 +01:00
parent a59c53b312
commit bc5428600b
1 changed files with 51 additions and 24 deletions
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75
dlls/gdi32/dibdrv/objects.c
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@ -1452,9 +1452,55 @@ static void wide_line_segment( dibdrv_physdev *pdev, HRGN total,
face_1->dy = face_2->dy = dy;
}
static BOOL wide_pen_lines(dibdrv_physdev *pdev, int num, POINT *pts, BOOL close, HRGN total)
static void wide_line_segments( dibdrv_physdev *pdev, int num, const POINT *pts, BOOL close,
int start, int count, const POINT *first_pt, const POINT *last_pt,
HRGN round_cap, HRGN total )
{
int i;
struct face face_1, face_2, prev_face, first_face;
const POINT *pt_1, *pt_2;
if (!close)
{
add_cap( pdev, total, round_cap, first_pt );
add_cap( pdev, total, round_cap, last_pt );
}
if (count == 1)
{
pt_1 = &pts[start];
pt_2 = &pts[(start + 1) % num];
wide_line_segment( pdev, total, first_pt, last_pt, pt_2->x - pt_1->x, pt_2->y - pt_1->y,
TRUE, TRUE, &face_1, &face_2 );
return;
}
pt_1 = &pts[start];
pt_2 = &pts[(start + 1) % num];
wide_line_segment( pdev, total, first_pt, pt_2, pt_2->x - pt_1->x, pt_2->y - pt_1->y,
!close, FALSE, &first_face, &prev_face );
for (i = 1; i < count - 1; i++)
{
pt_1 = &pts[(start + i) % num];
pt_2 = &pts[(start + i + 1) % num];
wide_line_segment( pdev, total, pt_1, pt_2, pt_2->x - pt_1->x, pt_2->y - pt_1->y,
FALSE, FALSE, &face_1, &face_2 );
add_join( pdev, total, round_cap, pt_1, &prev_face, &face_1 );
prev_face = face_2;
}
pt_1 = &pts[(start + count - 1) % num];
pt_2 = &pts[(start + count) % num];
wide_line_segment( pdev, total, pt_1, last_pt, pt_2->x - pt_1->x, pt_2->y - pt_1->y,
FALSE, !close, &face_1, &face_2 );
add_join( pdev, total, round_cap, pt_1, &prev_face, &face_1 );
if (close) add_join( pdev, total, round_cap, last_pt, &face_2, &first_face );
}
static BOOL wide_pen_lines(dibdrv_physdev *pdev, int num, POINT *pts, BOOL close, HRGN total)
{
HRGN round_cap = 0;
assert( total != 0 ); /* wide pens should always be drawn through a region */
@ -1468,30 +1514,11 @@ static BOOL wide_pen_lines(dibdrv_physdev *pdev, int num, POINT *pts, BOOL close
round_cap = CreateEllipticRgn( -(pdev->pen_width / 2), -(pdev->pen_width / 2),
(pdev->pen_width + 1) / 2, (pdev->pen_width + 1) / 2 );
if (!close) num--;
for (i = 0; i < num; i++)
{
const POINT *pt_1 = pts + i;
const POINT *pt_2 = pts + ((close && i == num - 1) ? 0 : i + 1);
int dx = pt_2->x - pt_1->x;
int dy = pt_2->y - pt_1->y;
struct face face_1, face_2, prev_face, first_face;
BOOL need_cap_1 = !close && (i == 0);
BOOL need_cap_2 = !close && (i == num - 1);
if (close)
wide_line_segments( pdev, num, pts, TRUE, 0, num, &pts[0], &pts[0], round_cap, total );
else
wide_line_segments( pdev, num, pts, FALSE, 0, num - 1, &pts[0], &pts[num - 1], round_cap, total );
wide_line_segment( pdev, total, pt_1, pt_2, dx, dy, need_cap_1, need_cap_2, &face_1, &face_2 );
if (need_cap_1) add_cap( pdev, total, round_cap, pt_1 );
if (need_cap_2) add_cap( pdev, total, round_cap, pt_2 );
if (i == 0) first_face = face_1;
else add_join( pdev, total, round_cap, pt_1, &prev_face, &face_1 );
if (i == num - 1 && close)
add_join( pdev, total, round_cap, pt_2, &face_2, &first_face );
prev_face = face_2;
}
if (round_cap) DeleteObject( round_cap );
return TRUE;
}