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gdi32: Add a helper function to initialize Bresenham parameters for line drawing.

This commit is contained in:
Alexandre Julliard 2012-07-30 12:02:34 +02:00
parent 6ca60b59c9
commit 78d12e7fcc
1 changed files with 45 additions and 60 deletions
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105
dlls/gdi32/dibdrv/objects.c
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@ -300,6 +300,39 @@ static inline DWORD calc_outcode(const POINT *pt, const RECT *clip)
return out;
}
static void init_bres_params( const POINT *start, const POINT *end, bres_params *clip_params,
struct line_params *line_params, RECT *rect )
{
INT dx = end->x - start->x, dy = end->y - start->y;
INT abs_dx = abs(dx), abs_dy = abs(dy);
clip_params->dx = abs_dx;
clip_params->dy = abs_dy;
clip_params->octant = get_octant_mask(dx, dy);
clip_params->bias = get_bias( clip_params->octant );
line_params->bias = clip_params->bias;
line_params->x_major = is_xmajor( clip_params->octant );
line_params->x_inc = is_x_increasing( clip_params->octant ) ? 1 : -1;
line_params->y_inc = is_y_increasing( clip_params->octant ) ? 1 : -1;
if (line_params->x_major)
{
line_params->err_add_1 = 2 * abs_dy - 2 * abs_dx;
line_params->err_add_2 = 2 * abs_dy;
}
else
{
line_params->err_add_1 = 2 * abs_dx - 2 * abs_dy;
line_params->err_add_2 = 2 * abs_dx;
}
rect->left = min( start->x, end->x );
rect->top = min( start->y, end->y );
rect->right = max( start->x, end->x ) + 1;
rect->bottom = max( start->y, end->y ) + 1;
}
/******************************************************************************
* clip_line
*
@ -570,34 +603,8 @@ static BOOL solid_pen_line(dibdrv_physdev *pdev, POINT *start, POINT *end, DWORD
{
bres_params clip_params;
struct line_params line_params;
INT dx = end->x - start->x, dy = end->y - start->y;
INT abs_dx = abs(dx), abs_dy = abs(dy);
clip_params.dx = abs_dx;
clip_params.dy = abs_dy;
clip_params.octant = get_octant_mask(dx, dy);
clip_params.bias = get_bias( clip_params.octant );
line_params.bias = clip_params.bias;
line_params.x_major = is_xmajor( clip_params.octant );
line_params.x_inc = is_x_increasing( clip_params.octant ) ? 1 : -1;
line_params.y_inc = is_y_increasing( clip_params.octant ) ? 1 : -1;
if (line_params.x_major)
{
line_params.err_add_1 = 2 * abs_dy - 2 * abs_dx;
line_params.err_add_2 = 2 * abs_dy;
}
else
{
line_params.err_add_1 = 2 * abs_dx - 2 * abs_dy;
line_params.err_add_2 = 2 * abs_dx;
}
rect.left = min( start->x, end->x );
rect.top = min( start->y, end->y );
rect.right = max( start->x, end->x ) + 1;
rect.bottom = max( start->y, end->y ) + 1;
init_bres_params( start, end, &clip_params, &line_params, &rect );
if (!get_clipped_rects( &pdev->dib, &rect, pdev->clip, &clipped_rects )) return TRUE;
for (i = 0; i < clipped_rects.count; i++)
{
@ -612,12 +619,14 @@ static BOOL solid_pen_line(dibdrv_physdev *pdev, POINT *start, POINT *end, DWORD
if (line_params.x_major)
{
line_params.err_start = 2 * abs_dy - abs_dx + m * 2 * abs_dy - n * 2 * abs_dx;
line_params.err_start = 2 * clip_params.dy - clip_params.dx
+ m * 2 * clip_params.dy - n * 2 * clip_params.dx;
line_params.length = abs( clipped_end.x - clipped_start.x ) + 1;
}
else
{
line_params.err_start = 2 * abs_dx - abs_dy + n * 2 * abs_dx - m * 2 * abs_dy;
line_params.err_start = 2 * clip_params.dx - clip_params.dy
+ n * 2 * clip_params.dx - m * 2 * clip_params.dy;
line_params.length = abs( clipped_end.y - clipped_start.y ) + 1;
}
@ -978,34 +987,8 @@ static BOOL dashed_pen_line(dibdrv_physdev *pdev, POINT *start, POINT *end)
{
bres_params clip_params;
struct line_params line_params;
INT dx = end->x - start->x, dy = end->y - start->y;
INT abs_dx = abs(dx), abs_dy = abs(dy);
clip_params.dx = abs_dx;
clip_params.dy = abs_dy;
clip_params.octant = get_octant_mask(dx, dy);
clip_params.bias = get_bias( clip_params.octant );
line_params.bias = clip_params.bias;
line_params.x_major = is_xmajor( clip_params.octant );
line_params.x_inc = is_x_increasing( clip_params.octant ) ? 1 : -1;
line_params.y_inc = is_y_increasing( clip_params.octant ) ? 1 : -1;
if (line_params.x_major)
{
line_params.err_add_1 = 2 * abs_dy - 2 * abs_dx;
line_params.err_add_2 = 2 * abs_dy;
}
else
{
line_params.err_add_1 = 2 * abs_dx - 2 * abs_dy;
line_params.err_add_2 = 2 * abs_dx;
}
rect.left = min( start->x, end->x );
rect.top = min( start->y, end->y );
rect.right = max( start->x, end->x ) + 1;
rect.bottom = max( start->y, end->y ) + 1;
init_bres_params( start, end, &clip_params, &line_params, &rect );
get_clipped_rects( &pdev->dib, &rect, pdev->clip, &clipped_rects );
for (i = 0; i < clipped_rects.count; i++)
{
@ -1022,13 +1005,15 @@ static BOOL dashed_pen_line(dibdrv_physdev *pdev, POINT *start, POINT *end)
if (line_params.x_major)
{
line_params.err_start = 2 * abs_dy - abs_dx + m * 2 * abs_dy - n * 2 * abs_dx;
line_params.err_start = 2 * clip_params.dy - clip_params.dx
+ m * 2 * clip_params.dy - n * 2 * clip_params.dx;
line_params.length = abs( clipped_end.x - clipped_start.x ) + 1;
skip_dash(pdev, m);
}
else
{
line_params.err_start = 2 * abs_dx - abs_dy + n * 2 * abs_dx - m * 2 * abs_dy;
line_params.err_start = 2 * clip_params.dx - clip_params.dy
+ n * 2 * clip_params.dx - m * 2 * clip_params.dy;
line_params.length = abs( clipped_end.y - clipped_start.y ) + 1;
skip_dash(pdev, n);
}
@ -1041,9 +1026,9 @@ static BOOL dashed_pen_line(dibdrv_physdev *pdev, POINT *start, POINT *end)
}
pdev->dash_pos = start_pos;
if(line_params.x_major)
skip_dash(pdev, abs_dx);
skip_dash(pdev, clip_params.dx);
else
skip_dash(pdev, abs_dy);
skip_dash(pdev, clip_params.dy);
}
free_clipped_rects( &clipped_rects );