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

This commit is contained in:
Alexandre Julliard 2011-12-28 12:21:07 +01:00
parent 0429d9181f
commit 3188c30229
1 changed files with 128 additions and 8 deletions
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136
dlls/gdi32/dibdrv/objects.c
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@ -631,21 +631,141 @@ static BOOL solid_pen_line(dibdrv_physdev *pdev, POINT *start, POINT *end, DWORD
return TRUE;
}
static BOOL solid_pen_line_region( dibdrv_physdev *pdev, POINT *start, POINT *end, HRGN region )
{
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)
{
rect.right = end->x;
order_end_points(&rect.left, &rect.right);
add_rect_to_region( region, &rect );
}
else if(start->x == end->x)
{
rect.bottom = end->y;
order_end_points(&rect.top, &rect.bottom);
add_rect_to_region( region, &rect );
}
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 );
if (is_xmajor( octant ))
{
int y_inc = is_y_increasing( octant ) ? 1 : -1;
int err_add_1 = 2 * abs_dy - 2 * abs_dx;
int err_add_2 = 2 * abs_dy;
int err = 2 * abs_dy - abs_dx;
if (is_x_increasing( octant ))
{
for (rect.right = start->x + 1; rect.right <= end->x; rect.right++)
{
if (err + bias > 0)
{
add_rect_to_region( region, &rect );
rect.left = rect.right;
rect.top += y_inc;
rect.bottom += y_inc;
err += err_add_1;
}
else err += err_add_2;
}
}
else
{
for (rect.left = start->x; rect.left > end->x; rect.left--)
{
if (err + bias > 0)
{
add_rect_to_region( region, &rect );
rect.right = rect.left;
rect.top += y_inc;
rect.bottom += y_inc;
err += err_add_1;
}
else err += err_add_2;
}
}
}
else
{
int x_inc = is_x_increasing( octant ) ? 1 : -1;
int err_add_1 = 2 * abs_dx - 2 * abs_dy;
int err_add_2 = 2 * abs_dx;
int err = 2 * abs_dx - abs_dy;
if (is_y_increasing( octant ))
{
for (rect.bottom = start->y + 1; rect.bottom <= end->y; rect.bottom++)
{
if (err + bias > 0)
{
add_rect_to_region( region, &rect );
rect.top = rect.bottom;
rect.left += x_inc;
rect.right += x_inc;
err += err_add_1;
}
else err += err_add_2;
}
}
else
{
for (rect.top = start->y; rect.top > end->y; rect.top--)
{
if (err + bias > 0)
{
add_rect_to_region( region, &rect );
rect.bottom = rect.top;
rect.left += x_inc;
rect.right += x_inc;
err += err_add_1;
}
else err += err_add_2;
}
}
}
/* add final rect */
add_rect_to_region( region, &rect );
}
return TRUE;
}
static BOOL solid_pen_lines(dibdrv_physdev *pdev, int num, POINT *pts, BOOL close, HRGN region)
{
int i;
DWORD color, and, xor;
color = get_pixel_color( pdev, pdev->pen_colorref, TRUE );
calc_and_xor_masks( GetROP2(pdev->dev.hdc), color, &and, &xor );
assert( num >= 2 );
for (i = 0; i < num - 1; i++)
if (!solid_pen_line( pdev, pts + i, pts + i + 1, and, xor ))
return FALSE;
if (close) return solid_pen_line( pdev, pts + num - 1, pts, and, xor );
if (region)
{
for (i = 0; i < num - 1; i++)
if (!solid_pen_line_region( pdev, pts + i, pts + i + 1, region ))
return FALSE;
if (close) return solid_pen_line_region( pdev, pts + num - 1, pts, region );
}
else
{
DWORD color, and, xor;
color = get_pixel_color( pdev, pdev->pen_colorref, TRUE );
calc_and_xor_masks( GetROP2(pdev->dev.hdc), color, &and, &xor );
for (i = 0; i < num - 1; i++)
if (!solid_pen_line( pdev, pts + i, pts + i + 1, and, xor ))
return FALSE;
if (close) return solid_pen_line( pdev, pts + num - 1, pts, and, xor );
}
return TRUE;
}