/* Draw a one-pixel-wide line. */
int
gx_default_draw_thin_line(gx_device * dev,
fixed fx0, fixed fy0, fixed fx1, fixed fy1,
const gx_device_color * pdevc, gs_logical_operation_t lop)
{
int ix = fixed2int_var(fx0);
int iy = fixed2int_var(fy0);
int itox = fixed2int_var(fx1);
int itoy = fixed2int_var(fy1);
return_if_interrupt(dev->memory);
if (itoy == iy) { /* horizontal line */
return (ix <= itox ?
gx_fill_rectangle_device_rop(ix, iy, itox - ix + 1, 1,
pdevc, dev, lop) :
gx_fill_rectangle_device_rop(itox, iy, ix - itox + 1, 1,
pdevc, dev, lop)
);
}
if (itox == ix) { /* vertical line */
return (iy <= itoy ?
gx_fill_rectangle_device_rop(ix, iy, 1, itoy - iy + 1,
pdevc, dev, lop) :
gx_fill_rectangle_device_rop(ix, itoy, 1, iy - itoy + 1,
pdevc, dev, lop)
);
} {
fixed h = fy1 - fy0;
fixed w = fx1 - fx0;
fixed tf;
bool swap_axes;
gs_fixed_edge left, right;
if ((w < 0 ? -w : w) <= (h < 0 ? -h : h)) {
if (h < 0)
SWAP(fx0, fx1, tf), SWAP(fy0, fy1, tf),
h = -h;
right.start.x = (left.start.x = fx0 - fixed_half) + fixed_1;
right.end.x = (left.end.x = fx1 - fixed_half) + fixed_1;
left.start.y = right.start.y = fy0;
left.end.y = right.end.y = fy1;
swap_axes = false;
} else {
if (w < 0)
SWAP(fx0, fx1, tf), SWAP(fy0, fy1, tf),
w = -w;
right.start.x = (left.start.x = fy0 - fixed_half) + fixed_1;
right.end.x = (left.end.x = fy1 - fixed_half) + fixed_1;
left.start.y = right.start.y = fx0;
left.end.y = right.end.y = fx1;
swap_axes = true;
}
return (*dev_proc(dev, fill_trapezoid)) (dev, &left, &right,
left.start.y, left.end.y,
swap_axes, pdevc, lop);
}
}
/* Draw a one-pixel-wide line. */
int
gx_default_draw_thin_line(gx_device * dev,
fixed fx0, fixed fy0, fixed fx1, fixed fy1,
const gx_device_color * pdevc, gs_logical_operation_t lop,
fixed adjustx, fixed adjusty)
{
int ix, iy, itox, itoy;
int epsilon;
return_if_interrupt(dev->memory);
/* This function was updated in revision 10391 to fix problems with
* mispositioned thin lines. This introduced a regression (see bug
* 691030). The code was then reworked to behave in what we believe is
* the correct manner, but this causes unacceptable problems with PCL
* output. While the current PCL work is underway, we have therefore
* amended this code to take note of the fill adjust values; if non-
* zero (i.e. postscript) we do "the correct thing". If zero, we do
* what we used to.
*
* The one case where this doesn't work is in the case where our PCL
* implementation thickens lines slightly to try and approximate HP
* printer behaviour. Here we do use a non-zero fill_adjust and hence
* have differences; tests show that these are acceptable though.
*
* It is hoped that this difference in behaviour will be short lived.
*/
epsilon = ((adjustx | adjusty) == 0 ? fixed_epsilon : 0);
{
fixed h = fy1 - fy0;
fixed w = fx1 - fx0;
fixed tf;
bool swap_axes;
gs_fixed_edge left, right;
if ((w < 0 ? -w : w) <= (h < 0 ? -h : h)) {
/* A "mostly-vertical" line */
if (h < 0)
SWAP(fx0, fx1, tf), SWAP(fy0, fy1, tf),
h = -h;
/* So we are plotting a trapezoid with horizontal thin edges.
* If we are drawing a non-axis aligned trap, then we check
* for whether a triangular extension area on the end covers an
* additional pixel centre; if so, we fill an extra pixel.
* If we are drawing an axis aligned trap and fill adjust is 0,
* then we shouldn't need to do this.
* If we are drawing an axis aligned trap, and fill adjust is non
* zero, then perform the check, but with a "butt cap" rather than
* a "triangle cap" region.
* See bug 687721 and bug 693212 for this history of this.
*/
if (w == 0 && adjusty) {
int deltay;
deltay = int2fixed(fixed2int_var(fy1)) + fixed_half -fy1;
if ((deltay > 0) && (deltay <= fixed_half))
{
int c = gx_fill_rectangle_device_rop(fixed2int_var(fx1),
fixed2int_var(fy1),
1,1,pdevc,dev,lop);
if (c < 0) return c;
}
deltay = int2fixed(fixed2int_var(fy0)) + fixed_half -fy0;
if ((deltay < 0) && (deltay >= -fixed_half))
{
int c = gx_fill_rectangle_device_rop(fixed2int_var(fx0),
fixed2int_var(fy0),
1,1,pdevc,dev,lop);
if (c < 0) return c;
}
} else if (w != 0) {
int deltax, deltay;
deltay = int2fixed(fixed2int_var(fy1)) + fixed_half -fy1;
deltax = int2fixed(fixed2int_var(fx1)) + fixed_half -fx1;
if (deltax < 0) deltax=-deltax;
if ((deltay > 0) && (deltay <= fixed_half) &&
(deltay+deltax <= fixed_half))
{
int c = gx_fill_rectangle_device_rop(fixed2int_var(fx1),
fixed2int_var(fy1),
1,1,pdevc,dev,lop);
if (c < 0) return c;
}
deltay = int2fixed(fixed2int_var(fy0)) + fixed_half -fy0;
deltax = int2fixed(fixed2int_var(fx0)) + fixed_half -fx0;
if (deltax < 0) deltax=-deltax;
if ((deltay < 0) && (deltay >= -fixed_half) &&
(-deltay+deltax <= fixed_half))
{
int c = gx_fill_rectangle_device_rop(fixed2int_var(fx0),
fixed2int_var(fy0),
1,1,pdevc,dev,lop);
if (c < 0) return c;
}
}
/* Can we treat it as a vertical rectangle? */
ix = fixed2int_var(fx0-epsilon);
itox = fixed2int_var(fx1-epsilon);
if (itox == ix) {
/* Figure out the start/height, allowing for our "covers
* centre of pixel" rule. */
iy = fixed2int_var(fy0+fixed_half-fixed_epsilon);
itoy = fixed2int_var(fy1+fixed_half-fixed_epsilon);
itoy = itoy - iy;
if (itoy <= 0) {
/* Zero height; drawing this as a trapezoid wouldn't
* fill any pixels, so just exit. */
return 0;
}
return gx_fill_rectangle_device_rop(ix, iy, 1, itoy,
pdevc, dev, lop);
}
left.start.x = fx0 - fixed_half + fixed_epsilon - epsilon;
right.start.x = left.start.x + fixed_1;
left.end.x = fx1 - fixed_half + fixed_epsilon - epsilon;
right.end.x = left.end.x + fixed_1;
left.start.y = right.start.y = fy0;
left.end.y = right.end.y = fy1;
swap_axes = false;
} else {
/* A "mostly-horizontal" line */
if (w < 0)
SWAP(fx0, fx1, tf), SWAP(fy0, fy1, tf),
w = -w;
/* So we are plotting a trapezoid with vertical thin edges
* Check for whether a triangular extension area on the end
* covers an additional pixel centre. */
if (h == 0 && adjustx) {
int deltax;
deltax = int2fixed(fixed2int_var(fx1)) + fixed_half -fx1;
if ((deltax > 0) && (deltax <= fixed_half))
{
int c = gx_fill_rectangle_device_rop(fixed2int_var(fx1),
fixed2int_var(fy1),
1,1,pdevc,dev,lop);
if (c < 0) return c;
}
deltax = int2fixed(fixed2int_var(fx0)) + fixed_half -fx0;
if ((deltax < 0) && (deltax >= -fixed_half))
{
int c = gx_fill_rectangle_device_rop(fixed2int_var(fx0),
fixed2int_var(fy0),
1,1,pdevc,dev,lop);
if (c < 0) return c;
}
} else if (h != 0) {
int deltax, deltay;
deltax = int2fixed(fixed2int_var(fx1)) + fixed_half -fx1;
deltay = int2fixed(fixed2int_var(fy1)) + fixed_half -fy1;
if (deltay < 0) deltay=-deltay;
if ((deltax > 0) && (deltax <= fixed_half) &&
(deltax+deltay <= fixed_half))
{
int c = gx_fill_rectangle_device_rop(fixed2int_var(fx1),
fixed2int_var(fy1),
1,1,pdevc,dev,lop);
if (c < 0) return c;
}
deltax = int2fixed(fixed2int_var(fx0)) + fixed_half -fx0;
deltay = int2fixed(fixed2int_var(fy0)) + fixed_half -fy0;
if (deltay < 0) deltay=-deltay;
if ((deltax < 0) && (deltax >= -fixed_half) &&
(-deltax+deltay <= fixed_half))
{
int c = gx_fill_rectangle_device_rop(fixed2int_var(fx0),
fixed2int_var(fy0),
1,1,pdevc,dev,lop);
if (c < 0) return c;
}
}
/* Can we treat this as a horizontal rectangle? */
iy = fixed2int_var(fy0 - epsilon);
itoy = fixed2int_var(fy1 - epsilon);
if (itoy == iy) {
/* Figure out the start/width, allowing for our "covers
* centre of pixel" rule. */
ix = fixed2int_var(fx0+fixed_half-fixed_epsilon);
itox = fixed2int_var(fx1+fixed_half-fixed_epsilon);
itox = itox - ix;
if (itox <= 0) {
/* Zero width; drawing this as a trapezoid wouldn't
* fill any pixels, so just exit. */
return 0;
}
return gx_fill_rectangle_device_rop(ix, iy, itox, 1,
pdevc, dev, lop);
}
left.start.x = fy0 - fixed_half + fixed_epsilon - epsilon;
right.start.x = left.start.x + fixed_1;
left.end.x = fy1 - fixed_half + fixed_epsilon - epsilon;
right.end.x = left.end.x + fixed_1;
left.start.y = right.start.y = fx0;
left.end.y = right.end.y = fx1;
swap_axes = true;
}
return (*dev_proc(dev, fill_trapezoid)) (dev, &left, &right,
left.start.y, left.end.y,
swap_axes, pdevc, lop);
}
}
