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gdi32: Implement returning a region for 1-pixel wide dashed pen lines.

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This commit is contained in:
Alexandre Julliard 2011-12-28 14:28:06 +01:00
parent 3188c30229
commit 9ee690c984
1 changed files with 145 additions and 8 deletions
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153
dlls/gdi32/dibdrv/objects.c
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@ -1047,21 +1047,158 @@ static BOOL dashed_pen_line(dibdrv_physdev *pdev, POINT *start, POINT *end)
return TRUE;
}
static BOOL dashed_pen_line_region(dibdrv_physdev *pdev, POINT *start, POINT *end, HRGN region)
{
int i, dash_len;
RECT rect;
rect.left = start->x;
rect.top = start->y;
rect.right = start->x + 1;
rect.bottom = start->y + 1;
if (start->y == end->y) /* hline */
{
if (start->x <= end->x)
{
for (i = start->x; i < end->x; i += dash_len)
{
dash_len = min( pdev->dash_pos.left_in_dash, end->x - i );
if (pdev->dash_pos.mark)
{
rect.left = i;
rect.right = i + dash_len;
add_rect_to_region( region, &rect );
}
skip_dash(pdev, dash_len);
}
}
else
{
for (i = start->x; i > end->x; i -= dash_len)
{
dash_len = min( pdev->dash_pos.left_in_dash, i - end->x );
if (pdev->dash_pos.mark)
{
rect.left = i - dash_len + 1;
rect.right = i + 1;
add_rect_to_region( region, &rect );
}
skip_dash(pdev, dash_len);
}
}
}
else if (start->x == end->x) /* vline */
{
if (start->y <= end->y)
{
for (i = start->y; i < end->y; i += dash_len)
{
dash_len = min( pdev->dash_pos.left_in_dash, end->y - i );
if (pdev->dash_pos.mark)
{
rect.top = i;
rect.bottom = i + dash_len;
add_rect_to_region( region, &rect );
}
skip_dash(pdev, dash_len);
}
}
else
{
for (i = start->y; i > end->y; i -= dash_len)
{
dash_len = min( pdev->dash_pos.left_in_dash, i - end->y );
if (pdev->dash_pos.mark)
{
rect.top = i - dash_len + 1;
rect.bottom = i + 1;
add_rect_to_region( region, &rect );
}
skip_dash(pdev, dash_len);
}
}
}
else
{
INT dx = end->x - start->x, dy = end->y - start->y;
INT abs_dx = abs(dx), abs_dy = abs(dy);
DWORD octant = get_octant_mask(dx, dy);
INT bias = get_bias( octant );
int x_inc = is_x_increasing( octant ) ? 1 : -1;
int y_inc = is_y_increasing( octant ) ? 1 : -1;
if (is_xmajor( octant ))
{
int err_add_1 = 2 * abs_dy - 2 * abs_dx;
int err_add_2 = 2 * abs_dy;
int err = 2 * abs_dy - abs_dx;
while (abs_dx--)
{
if (pdev->dash_pos.mark) add_rect_to_region( region, &rect );
skip_dash(pdev, 1);
rect.left += x_inc;
rect.right += x_inc;
if (err + bias > 0)
{
rect.top += y_inc;
rect.bottom += y_inc;
err += err_add_1;
}
else err += err_add_2;
}
}
else
{
int err_add_1 = 2 * abs_dx - 2 * abs_dy;
int err_add_2 = 2 * abs_dx;
int err = 2 * abs_dx - abs_dy;
while (abs_dy--)
{
if (pdev->dash_pos.mark) add_rect_to_region( region, &rect );
skip_dash(pdev, 1);
rect.top += y_inc;
rect.bottom += y_inc;
if (err + bias > 0)
{
rect.left += x_inc;
rect.right += x_inc;
err += err_add_1;
}
else err += err_add_2;
}
}
}
return TRUE;
}
static BOOL dashed_pen_lines(dibdrv_physdev *pdev, int num, POINT *pts, BOOL close, HRGN region)
{
int i;
get_color_masks( pdev, GetROP2(pdev->dev.hdc), pdev->pen_colorref,
pdev->pen_is_ext ? TRANSPARENT : GetBkMode(pdev->dev.hdc),
&pdev->dash_masks[1], &pdev->dash_masks[0] );
assert( num >= 2 );
for (i = 0; i < num - 1; i++)
if (!dashed_pen_line( pdev, pts + i, pts + i + 1 ))
return FALSE;
if (close) return dashed_pen_line( pdev, pts + num - 1, pts );
if (region)
{
for (i = 0; i < num - 1; i++)
if (!dashed_pen_line_region( pdev, pts + i, pts + i + 1, region ))
return FALSE;
if (close) return dashed_pen_line_region( pdev, pts + num - 1, pts, region );
}
else
{
get_color_masks( pdev, GetROP2(pdev->dev.hdc), pdev->pen_colorref,
pdev->pen_is_ext ? TRANSPARENT : GetBkMode(pdev->dev.hdc),
&pdev->dash_masks[1], &pdev->dash_masks[0] );
for (i = 0; i < num - 1; i++)
if (!dashed_pen_line( pdev, pts + i, pts + i + 1 ))
return FALSE;
if (close) return dashed_pen_line( pdev, pts + num - 1, pts );
}
return TRUE;
}