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gdi32: Add a helper function for drawing a wide line segment.

This commit is contained in:
Alexandre Julliard 2012-01-04 15:50:31 +01:00
parent 8b1bab524b
commit a59c53b312
1 changed files with 127 additions and 119 deletions
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246
dlls/gdi32/dibdrv/objects.c
View File

@ -1326,6 +1326,132 @@ static void add_join( dibdrv_physdev *pdev, HRGN region, HRGN round_cap, const P
return;
}
static void wide_line_segment( dibdrv_physdev *pdev, HRGN total,
const POINT *pt_1, const POINT *pt_2, int dx, int dy,
BOOL need_cap_1, BOOL need_cap_2, struct face *face_1, struct face *face_2 )
{
RECT rect;
BOOL sq_cap_1 = need_cap_1 && (pdev->pen_endcap == PS_ENDCAP_SQUARE);
BOOL sq_cap_2 = need_cap_2 && (pdev->pen_endcap == PS_ENDCAP_SQUARE);
if (dx == 0 && dy == 0) return;
if (dy == 0)
{
rect.left = min( pt_1->x, pt_2->x );
rect.right = max( pt_1->x, pt_2->x );
rect.top = pt_1->y - pdev->pen_width / 2;
rect.bottom = rect.top + pdev->pen_width;
if ((sq_cap_1 && dx > 0) || (sq_cap_2 && dx < 0)) rect.left -= pdev->pen_width / 2;
if ((sq_cap_2 && dx > 0) || (sq_cap_1 && dx < 0)) rect.right += pdev->pen_width / 2;
add_rect_to_region( total, &rect );
if (dx > 0)
{
face_1->start.x = face_1->end.x = rect.left;
face_1->start.y = face_2->end.y = rect.bottom;
face_1->end.y = face_2->start.y = rect.top;
face_2->start.x = face_2->end.x = rect.right - 1;
}
else
{
face_1->start.x = face_1->end.x = rect.right;
face_1->start.y = face_2->end.y = rect.top;
face_1->end.y = face_2->start.y = rect.bottom;
face_2->start.x = face_2->end.x = rect.left + 1;
}
}
else if (dx == 0)
{
rect.top = min( pt_1->y, pt_2->y );
rect.bottom = max( pt_1->y, pt_2->y );
rect.left = pt_1->x - pdev->pen_width / 2;
rect.right = rect.left + pdev->pen_width;
if ((sq_cap_1 && dy > 0) || (sq_cap_2 && dy < 0)) rect.top -= pdev->pen_width / 2;
if ((sq_cap_2 && dy > 0) || (sq_cap_1 && dy < 0)) rect.bottom += pdev->pen_width / 2;
add_rect_to_region( total, &rect );
if (dy > 0)
{
face_1->start.x = face_2->end.x = rect.left;
face_1->start.y = face_1->end.y = rect.top;
face_1->end.x = face_2->start.x = rect.right;
face_2->start.y = face_2->end.y = rect.bottom - 1;
}
else
{
face_1->start.x = face_2->end.x = rect.right;
face_1->start.y = face_1->end.y = rect.bottom;
face_1->end.x = face_2->start.x = rect.left;
face_2->start.y = face_2->end.y = rect.top + 1;
}
}
else
{
double len = hypot( dx, dy );
double width_x, width_y;
POINT seg_pts[4];
POINT wide_half, narrow_half;
HRGN segment;
width_x = pdev->pen_width * abs( dy ) / len;
width_y = pdev->pen_width * abs( dx ) / len;
narrow_half.x = round( width_x / 2 );
narrow_half.y = round( width_y / 2 );
wide_half.x = round( (width_x + 1) / 2 );
wide_half.y = round( (width_y + 1) / 2 );
if (dx < 0)
{
wide_half.y = -wide_half.y;
narrow_half.y = -narrow_half.y;
}
if (dy < 0)
{
POINT tmp = narrow_half; narrow_half = wide_half; wide_half = tmp;
wide_half.x = -wide_half.x;
narrow_half.x = -narrow_half.x;
}
seg_pts[0].x = pt_1->x - narrow_half.x;
seg_pts[0].y = pt_1->y + narrow_half.y;
seg_pts[1].x = pt_1->x + wide_half.x;
seg_pts[1].y = pt_1->y - wide_half.y;
seg_pts[2].x = pt_2->x + wide_half.x;
seg_pts[2].y = pt_2->y - wide_half.y;
seg_pts[3].x = pt_2->x - narrow_half.x;
seg_pts[3].y = pt_2->y + narrow_half.y;
if (sq_cap_1)
{
seg_pts[0].x -= narrow_half.y;
seg_pts[1].x -= narrow_half.y;
seg_pts[0].y -= narrow_half.x;
seg_pts[1].y -= narrow_half.x;
}
if (sq_cap_2)
{
seg_pts[2].x += wide_half.y;
seg_pts[3].x += wide_half.y;
seg_pts[2].y += wide_half.x;
seg_pts[3].y += wide_half.x;
}
segment = CreatePolygonRgn( seg_pts, 4, ALTERNATE );
CombineRgn( total, total, segment, RGN_OR );
DeleteObject( segment );
face_1->start = seg_pts[0];
face_1->end = seg_pts[1];
face_2->start = seg_pts[2];
face_2->end = seg_pts[3];
}
face_1->dx = face_2->dx = dx;
face_1->dy = face_2->dy = dy;
}
static BOOL wide_pen_lines(dibdrv_physdev *pdev, int num, POINT *pts, BOOL close, HRGN total)
{
int i;
@ -1349,133 +1475,15 @@ static BOOL wide_pen_lines(dibdrv_physdev *pdev, int num, POINT *pts, BOOL close
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;
RECT rect;
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);
BOOL sq_cap_1 = need_cap_1 && (pdev->pen_endcap == PS_ENDCAP_SQUARE);
BOOL sq_cap_2 = need_cap_2 && (pdev->pen_endcap == PS_ENDCAP_SQUARE);
if (dx == 0 && dy == 0) continue;
if (dy == 0)
{
rect.left = min( pt_1->x, pt_2->x );
rect.right = rect.left + abs( dx );
rect.top = pt_1->y - pdev->pen_width / 2;
rect.bottom = rect.top + pdev->pen_width;
if ((sq_cap_1 && dx > 0) || (sq_cap_2 && dx < 0)) rect.left -= pdev->pen_width / 2;
if ((sq_cap_2 && dx > 0) || (sq_cap_1 && dx < 0)) rect.right += pdev->pen_width / 2;
add_rect_to_region( total, &rect );
if (dx > 0)
{
face_1.start.x = face_1.end.x = rect.left;
face_1.start.y = face_2.end.y = rect.bottom;
face_1.end.y = face_2.start.y = rect.top;
face_2.start.x = face_2.end.x = rect.right - 1;
}
else
{
face_1.start.x = face_1.end.x = rect.right;
face_1.start.y = face_2.end.y = rect.top;
face_1.end.y = face_2.start.y = rect.bottom;
face_2.start.x = face_2.end.x = rect.left + 1;
}
}
else if (dx == 0)
{
rect.top = min( pt_1->y, pt_2->y );
rect.bottom = rect.top + abs( dy );
rect.left = pt_1->x - pdev->pen_width / 2;
rect.right = rect.left + pdev->pen_width;
if ((sq_cap_1 && dy > 0) || (sq_cap_2 && dy < 0)) rect.top -= pdev->pen_width / 2;
if ((sq_cap_2 && dy > 0) || (sq_cap_1 && dy < 0)) rect.bottom += pdev->pen_width / 2;
add_rect_to_region( total, &rect );
if (dy > 0)
{
face_1.start.x = face_2.end.x = rect.left;
face_1.start.y = face_1.end.y = rect.top;
face_1.end.x = face_2.start.x = rect.right;
face_2.start.y = face_2.end.y = rect.bottom - 1;
}
else
{
face_1.start.x = face_2.end.x = rect.right;
face_1.start.y = face_1.end.y = rect.bottom;
face_1.end.x = face_2.start.x = rect.left;
face_2.start.y = face_2.end.y = rect.top + 1;
}
}
else
{
double len = hypot( dx, dy );
double width_x, width_y;
POINT seg_pts[4];
POINT wide_half, narrow_half;
HRGN segment;
width_x = pdev->pen_width * abs( dy ) / len;
width_y = pdev->pen_width * abs( dx ) / len;
narrow_half.x = round( width_x / 2 );
narrow_half.y = round( width_y / 2 );
wide_half.x = round( (width_x + 1) / 2 );
wide_half.y = round( (width_y + 1) / 2 );
if (dx < 0)
{
wide_half.y = -wide_half.y;
narrow_half.y = -narrow_half.y;
}
if (dy < 0)
{
POINT tmp = narrow_half; narrow_half = wide_half; wide_half = tmp;
wide_half.x = -wide_half.x;
narrow_half.x = -narrow_half.x;
}
seg_pts[0].x = pt_1->x - narrow_half.x;
seg_pts[0].y = pt_1->y + narrow_half.y;
seg_pts[1].x = pt_1->x + wide_half.x;
seg_pts[1].y = pt_1->y - wide_half.y;
seg_pts[2].x = pt_2->x + wide_half.x;
seg_pts[2].y = pt_2->y - wide_half.y;
seg_pts[3].x = pt_2->x - narrow_half.x;
seg_pts[3].y = pt_2->y + narrow_half.y;
if (sq_cap_1)
{
seg_pts[0].x -= narrow_half.y;
seg_pts[1].x -= narrow_half.y;
seg_pts[0].y -= narrow_half.x;
seg_pts[1].y -= narrow_half.x;
}
if (sq_cap_2)
{
seg_pts[2].x += wide_half.y;
seg_pts[3].x += wide_half.y;
seg_pts[2].y += wide_half.x;
seg_pts[3].y += wide_half.x;
}
segment = CreatePolygonRgn( seg_pts, 4, ALTERNATE );
CombineRgn( total, total, segment, RGN_OR );
DeleteObject( segment );
face_1.start = seg_pts[0];
face_1.end = seg_pts[1];
face_2.start = seg_pts[2];
face_2.end = seg_pts[3];
}
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 );
face_1.dx = face_2.dx = dx;
face_1.dy = face_2.dy = dy;
if (i == 0) first_face = face_1;
else add_join( pdev, total, round_cap, pt_1, &prev_face, &face_1 );