int
gs_reversepath(gs_state * pgs)
{
gx_path *ppath = pgs->path;
gx_path rpath;
int code;
gx_path_init_local(&rpath, ppath->memory);
code = gx_path_copy_reversed(ppath, &rpath);
if (code < 0) {
gx_path_free(&rpath, "gs_reversepath");
return code;
}
if (pgs->current_point_valid) {
/* Not empty. */
gx_setcurrentpoint(pgs, fixed2float(rpath.position.x),
fixed2float(rpath.position.y));
if (rpath.first_subpath != 0) {
pgs->subpath_start.x = fixed2float(rpath.segments->contents.subpath_current->pt.x);
pgs->subpath_start.y = fixed2float(rpath.segments->contents.subpath_current->pt.y);
}
}
gx_path_assign_free(ppath, &rpath);
return 0;
}
/* <userpath> <matrix> ustrokepath - */
static int
zustrokepath(i_ctx_t *i_ctx_p)
{
gx_path save;
gs_matrix saved_matrix;
int npop, code = gs_currentmatrix(igs, &saved_matrix);
if (code < 0)
return code;
/* Save and reset the path. */
gx_path_init_local(&save, imemory);
gx_path_assign_preserve(&save, igs->path);
if ((code = npop = upath_stroke(i_ctx_p, NULL, false)) < 0 ||
(code = gs_strokepath(igs)) < 0
) {
gx_path_assign_free(igs->path, &save);
return code;
}
/*
* If a matrix was specified then restore the previous matrix.
*/
if (npop > 1) {
if ((code = gs_setmatrix(igs, &saved_matrix)) < 0) {
gx_path_assign_free(igs->path, &save);
return code;
}
}
gx_path_free(&save, "ustrokepath");
pop(npop);
return 0;
}
/* Intersect a clipping path a shading BBox. */
int
gx_dc_pattern2_clip_with_bbox(const gx_device_color * pdevc, gx_device * pdev,
gx_clip_path *cpath_local, const gx_clip_path **ppcpath1)
{
if (gx_dc_is_pattern2_color(pdevc) && gx_dc_pattern2_color_has_bbox(pdevc) &&
(*dev_proc(pdev, dev_spec_op))(pdev, gxdso_pattern_shading_area, NULL, 0) == 0) {
gs_pattern2_instance_t *pinst = (gs_pattern2_instance_t *)pdevc->ccolor.pattern;
gx_path box_path;
gs_memory_t *mem = (*ppcpath1 != NULL ? (*ppcpath1)->path.memory : pdev->memory);
int code;
gx_path_init_local(&box_path, mem);
code = gx_dc_shading_path_add_box(&box_path, pdevc);
if (code == gs_error_limitcheck) {
/* Ignore huge BBox - bug 689027. */
code = 0;
} else {
if (code >= 0) {
gx_cpath_init_local_shared(cpath_local, *ppcpath1, mem);
code = gx_cpath_intersect(cpath_local, &box_path, gx_rule_winding_number, (gs_imager_state *)pinst->saved);
*ppcpath1 = cpath_local;
}
}
gx_path_free(&box_path, "gx_default_fill_path(path_bbox)");
}
return 0;
}
/* Set up a clipping path and device for insideness testing. */
static int
in_path(os_ptr oppath, i_ctx_t *i_ctx_p, gx_device * phdev)
{
int code = gs_gsave(igs);
int npop;
double uxy[2];
if (code < 0)
return code;
code = num_params(oppath, 2, uxy);
if (code >= 0) { /* Aperture is a single pixel. */
gs_point dxy;
gs_fixed_rect fr;
gs_transform(igs, uxy[0], uxy[1], &dxy);
fr.p.x = fixed_floor(float2fixed(dxy.x));
fr.p.y = fixed_floor(float2fixed(dxy.y));
fr.q.x = fr.p.x + fixed_1;
fr.q.y = fr.p.y + fixed_1;
code = gx_clip_to_rectangle(igs, &fr);
npop = 2;
} else if (code == e_stackunderflow) {
/* If 0 elements, definitely a stackunderflow; otherwise, */
/* only 1 number, also a stackunderflow. */
npop = code;
} else { /* Aperture is a user path. */
/* We have to set the clipping path without disturbing */
/* the current path. */
gx_path *ipath = igs->path;
gx_path save;
gx_path_init_local(&save, imemory);
gx_path_assign_preserve(&save, ipath);
gs_newpath(igs);
code = upath_append(oppath, i_ctx_p, false);
if (code >= 0)
code = gx_clip_to_path(igs);
gx_path_assign_free(igs->path, &save);
npop = 1;
}
if (code < 0) {
gs_grestore(igs);
return code;
}
/* Install the hit detection device. */
gx_set_device_color_1(igs);
gx_device_init((gx_device *) phdev, (const gx_device *)&gs_hit_device,
NULL, true);
phdev->width = phdev->height = max_int;
gx_device_fill_in_procs(phdev);
gx_set_device_only(igs, phdev);
return npop;
}
/*
* Copy the current path, because it was shared.
*/
static int
path_alloc_copy(gx_path * ppath)
{
gx_path path_new;
int code;
gx_path_init_local(&path_new, ppath->memory);
code = gx_path_copy(ppath, &path_new);
if (code < 0) {
gx_path_free(&path_new, "path_alloc_copy error");
return code;
}
ppath->last_charpath_segment = 0;
return gx_path_assign_free(ppath, &path_new);
}
/* shfill */
int
gs_shfill(gs_state * pgs, const gs_shading_t * psh)
{
/*
* shfill is equivalent to filling the current clipping path (or, if
* clipping, its bounding box) with the shading, disregarding the
* Background if any. In order to produce reasonable high-level output,
* we must actually implement this by calling gs_fill rather than
* gs_shading_fill_path. However, filling with a shading pattern does
* paint the Background, so if necessary, we construct a copy of the
* shading with Background removed.
*/
gs_pattern2_template_t pat;
gx_path cpath;
gs_matrix imat;
gs_client_color cc;
gs_color_space cs;
gx_device_color devc;
int code;
gs_pattern2_init(&pat);
pat.Shading = psh;
gs_make_identity(&imat);
code = gs_make_pattern(&cc, (gs_pattern_template_t *)&pat, &imat, pgs,
pgs->memory);
if (code < 0)
return code;
code = gs_pattern2_set_shfill(&cc);
if (code < 0)
return code;
gs_cspace_init(&cs, &gs_color_space_type_Pattern, pgs->memory, false);
cs.params.pattern.has_base_space = false;
code = cs.type->remap_color(&cc, &cs, &devc, (gs_imager_state *)pgs,
pgs->device, gs_color_select_texture);
if (code >= 0) {
gx_path_init_local(&cpath, pgs->memory);
code = gx_cpath_to_path(pgs->clip_path, &cpath);
if (code >= 0)
code = gx_fill_path(&cpath, &devc, pgs, gx_rule_winding_number,
fixed_0, fixed_0);
gx_path_free(&cpath, "gs_shfill");
}
gs_pattern_reference(&cc, -1);
return code;
}
int
gs_clippath(gs_state * pgs)
{
gx_path cpath;
int code;
gx_path_init_local(&cpath, pgs->path->memory);
code = gx_cpath_to_path(pgs->clip_path, &cpath);
if (code >= 0) {
code = gx_path_assign_free(pgs->path, &cpath);
pgs->current_point.x = fixed2float(pgs->path->position.x);
pgs->current_point.y = fixed2float(pgs->path->position.y);
pgs->current_point_valid = true;
}
if (code < 0)
gx_path_free(&cpath, "gs_clippath");
return code;
}
int
gs_flattenpath(gs_state * pgs)
{
gx_path *ppath = pgs->path;
gx_path fpath;
int code;
if (!gx_path_has_curves(ppath))
return 0; /* nothing to do */
gx_path_init_local(&fpath, ppath->memory);
code = gx_path_add_flattened_accurate(ppath, &fpath, pgs->flatness,
pgs->accurate_curves);
if (code < 0) {
gx_path_free(&fpath, "gs_flattenpath");
return code;
}
gx_path_assign_free(ppath, &fpath);
return 0;
}
/* Clip to a list of rectangles. */
int
gs_rectclip(gs_state * pgs, const gs_rect * pr, uint count)
{
int code;
gx_path save;
gx_path_init_local(&save, pgs->memory);
gx_path_assign_preserve(&save, pgs->path);
gs_newpath(pgs);
if ((code = gs_rectappend_compat(pgs, pr, count, true)) < 0 ||
(code = gs_clip(pgs)) < 0
) {
gx_path_assign_free(pgs->path, &save);
return code;
}
gx_path_free(&save, "gs_rectclip");
gs_newpath(pgs);
return 0;
}
int
gs_dashpath(gs_state * pgs)
{
gx_path *ppath;
gx_path fpath;
int code;
if (gs_currentdash_length(pgs) == 0)
return 0; /* no dash pattern */
code = gs_flattenpath(pgs);
if (code < 0)
return code;
ppath = pgs->path;
gx_path_init_local(&fpath, ppath->memory);
code = gx_path_add_dash_expansion(ppath, &fpath, (gs_imager_state *)pgs);
if (code < 0) {
gx_path_free(&fpath, "gs_dashpath");
return code;
}
gx_path_assign_free(pgs->path, &fpath);
return 0;
}
int
gs_viewclippath(gs_state * pgs)
{
gx_path cpath;
gx_clip_path *pcpath = pgs->view_clip;
int code;
gx_path_init_local(&cpath, pgs->memory);
if (pcpath == 0 || pcpath->rule == 0) {
/* No view clip path is active: fabricate one. */
gs_fixed_rect box;
code = gx_default_clip_box(pgs, &box);
if (code < 0)
return code;
code = gx_path_add_rectangle(&cpath, box.p.x, box.p.y,
box.q.x, box.q.y);
} else {
code = gx_cpath_to_path(pcpath, &cpath);
}
if (code < 0)
return code;
return gx_path_assign_free(pgs->path, &cpath);
}
/* Compute the stroked outline of the current path */
int
gs_strokepath(gs_state * pgs)
{
gx_path spath;
int code;
gx_path_init_local(&spath, pgs->path->memory);
code = gx_stroke_add(pgs->path, &spath, pgs);
if (code < 0) {
gx_path_free(&spath, "gs_strokepath");
return code;
}
pgs->device->sgr.stroke_stored = false;
code = gx_path_assign_free(pgs->path, &spath);
if (code < 0)
return code;
/* NB: needs testing with PCL */
if (CPSI_mode && gx_path_is_void(pgs->path))
pgs->current_point_valid = false;
else
gx_setcurrentpoint(pgs, fixed2float(spath.position.x), fixed2float(spath.position.y));
return 0;
}
/*
* Return the effective clipping path of a graphics state. Sometimes this
* is the intersection of the clip path and the view clip path; sometimes it
* is just the clip path. We aren't sure what the correct algorithm is for
* this: for now, we use view clipping unless the current device is a memory
* device. This takes care of the most important case, where the current
* device is a cache device.
*/
int
gx_effective_clip_path(gs_state * pgs, gx_clip_path ** ppcpath)
{
gs_id view_clip_id =
(pgs->view_clip == 0 || pgs->view_clip->rule == 0 ? gs_no_id :
pgs->view_clip->id);
if (gs_device_is_memory(pgs->device)) {
*ppcpath = pgs->clip_path;
return 0;
}
if (pgs->effective_clip_id == pgs->clip_path->id &&
pgs->effective_view_clip_id == view_clip_id
) {
*ppcpath = pgs->effective_clip_path;
return 0;
}
/* Update the cache. */
if (view_clip_id == gs_no_id) {
if (!pgs->effective_clip_shared)
gx_cpath_free(pgs->effective_clip_path, "gx_effective_clip_path");
pgs->effective_clip_path = pgs->clip_path;
pgs->effective_clip_shared = true;
} else {
gs_fixed_rect cbox, vcbox;
gx_cpath_inner_box(pgs->clip_path, &cbox);
gx_cpath_outer_box(pgs->view_clip, &vcbox);
if (rect_within(vcbox, cbox)) {
if (!pgs->effective_clip_shared)
gx_cpath_free(pgs->effective_clip_path,
"gx_effective_clip_path");
pgs->effective_clip_path = pgs->view_clip;
pgs->effective_clip_shared = true;
} else {
/* Construct the intersection of the two clip paths. */
int code;
gx_clip_path ipath;
gx_path vpath;
gx_clip_path *npath = pgs->effective_clip_path;
if (pgs->effective_clip_shared) {
npath = gx_cpath_alloc(pgs->memory, "gx_effective_clip_path");
if (npath == 0)
return_error(gs_error_VMerror);
}
gx_cpath_init_local(&ipath, pgs->memory);
code = gx_cpath_assign_preserve(&ipath, pgs->clip_path);
if (code < 0)
return code;
gx_path_init_local(&vpath, pgs->memory);
code = gx_cpath_to_path(pgs->view_clip, &vpath);
if (code < 0 ||
(code = gx_cpath_clip(pgs, &ipath, &vpath,
gx_rule_winding_number)) < 0 ||
(code = gx_cpath_assign_free(npath, &ipath)) < 0
)
DO_NOTHING;
gx_path_free(&vpath, "gx_effective_clip_path");
gx_cpath_free(&ipath, "gx_effective_clip_path");
if (code < 0)
return code;
pgs->effective_clip_path = npath;
pgs->effective_clip_shared = false;
}
}
pgs->effective_clip_id = pgs->effective_clip_path->id;
pgs->effective_view_clip_id = view_clip_id;
*ppcpath = pgs->effective_clip_path;
return 0;
}
/* Stroke the current path */
int
gs_stroke(gs_state * pgs)
{
int code;
/*
* If we're inside a charpath, just merge the current path
* into the parent's path.
*/
if (pgs->in_charpath) {
if (pgs->in_charpath == cpm_true_charpath) {
/*
* A stroke inside a true charpath should do the
* equivalent of strokepath.
*/
code = gs_strokepath(pgs);
if (code < 0)
return code;
}
code = gx_path_add_char_path(pgs->show_gstate->path, pgs->path,
pgs->in_charpath);
}
if (gs_is_null_device(pgs->device)) {
/* Handle separately to prevent gs_state_color_load. */
gs_newpath(pgs);
code = 0;
} else {
int abits, acode, rcode = 0;
/* to distinguish text from vectors we hackly look at the
target device 1 bit per component is a cache and this is
text else it is a path */
if (gx_device_has_color(gs_currentdevice(pgs)))
gs_set_object_tag(pgs, GS_PATH_TAG);
else
gs_set_object_tag(pgs, GS_TEXT_TAG);
/* Here we need to distinguish text from vectors to compute the object tag.
Actually we need to know whether this function is called to rasterize a character,
or to rasterize a vector graphics to the output device.
Currently we assume it works for the bitrgbtags device only,
which is a low level device with a 4-component color model.
We use the fact that with printers a character is usually being rendered
to a 1bpp cache device rather than to the output device.
Therefore we hackly look whether the target device
"has a color" : either it's a multicomponent color model,
or it is not gray (such as a yellow separation).
This check has several limitations :
1. It doesn't work with -dNOCACHE.
2. It doesn't work with large characters,
which cannot fit into a cache cell and thus they
render directly to the output device.
3. It doesn't work for TextAlphaBits=2 or 4.
We don't care of this case because
text antialiasing usually usn't applied to printers.
4. It doesn't work for things like with "(xyz) true charpath stroke".
That's unfortunate, we'd like to improve someday.
5. It doesn't work for high level devices when a Type 3 character is being constructed.
This case is not important for low level devices
(which a printer is), because low level device doesn't accept
Type 3 charproc streams immediately.
*/
if (gx_device_has_color(gs_currentdevice(pgs))) {
gs_set_object_tag(pgs, GS_PATH_TAG);
}
else {
gs_set_object_tag(pgs, GS_TEXT_TAG);
}
gx_set_dev_color(pgs);
code = gs_state_color_load(pgs);
if (code < 0)
return code;
abits = alpha_buffer_bits(pgs);
if (abits > 1) {
/*
* Expand the bounding box by the line width.
* This is expensive to compute, so we only do it
* if we know we're going to buffer.
*/
float xxyy = fabs(pgs->ctm.xx) + fabs(pgs->ctm.yy);
float xyyx = fabs(pgs->ctm.xy) + fabs(pgs->ctm.yx);
float scale = (float)(1 << (abits / 2));
float orig_width = gs_currentlinewidth(pgs);
float new_width = orig_width * scale;
fixed extra_adjust =
float2fixed(max(xxyy, xyyx) * new_width / 2);
float orig_flatness = gs_currentflat(pgs);
gx_path spath;
/* Scale up the line width, dash pattern, and flatness. */
if (extra_adjust < fixed_1)
extra_adjust = fixed_1;
acode = alpha_buffer_init(pgs,
pgs->fill_adjust.x + extra_adjust,
pgs->fill_adjust.y + extra_adjust,
abits);
if (acode < 0)
return acode;
gs_setlinewidth(pgs, new_width);
scale_dash_pattern(pgs, scale);
gs_setflat(pgs, orig_flatness * scale);
/*
* The alpha-buffer device requires that we fill the
* entire path as a single unit.
*/
gx_path_init_local(&spath, pgs->memory);
code = gx_stroke_add(pgs->path, &spath, pgs);
gs_setlinewidth(pgs, orig_width);
scale_dash_pattern(pgs, 1.0 / scale);
if (code >= 0)
code = gx_fill_path(&spath, pgs->dev_color, pgs,
gx_rule_winding_number,
pgs->fill_adjust.x,
pgs->fill_adjust.y);
gs_setflat(pgs, orig_flatness);
gx_path_free(&spath, "gs_stroke");
if (acode > 0)
rcode = alpha_buffer_release(pgs, code >= 0);
} else
code = gx_stroke_fill(pgs->path, pgs);
if (code >= 0)
gs_newpath(pgs);
if (code >= 0 && rcode < 0)
code = rcode;
}
return code;
}
/* shfill */
int
gs_shfill(gs_gstate * pgs, const gs_shading_t * psh)
{
/*
* shfill is equivalent to filling the current clipping path (or, if
* clipping, its bounding box) with the shading, disregarding the
* Background if any. In order to produce reasonable high-level output,
* we must implement this by calling gs_fill_path.
*/
gs_pattern2_template_t pat;
gs_matrix imat;
gs_client_color cc;
gs_color_space *pcs;
gx_device_color devc;
int code;
/* Must install the shading color space
to allow check_DeviceN_component_names initialize
the color component map.
*/
/* Don't bother with saving the old color space, color,
and cie_joint_caches,
because .shfill is always called within gsave-grestore -
see gs/lib . */
code = gs_setcolorspace(pgs, psh->params.ColorSpace);
if (code < 0)
return 0;
if (psh->params.cie_joint_caches != NULL) {
pgs->cie_joint_caches = psh->params.cie_joint_caches;
rc_increment(pgs->cie_joint_caches);
}
gs_pattern2_init(&pat);
pat.Shading = psh;
gs_make_identity(&imat);
code = gs_make_pattern(&cc, (gs_pattern_template_t *)&pat, &imat, pgs,
pgs->memory);
if (code < 0)
return code;
code = gs_pattern2_set_shfill(&cc);
if (code < 0)
return code;
pcs = gs_cspace_alloc(pgs->memory, &gs_color_space_type_Pattern);
if (pcs == NULL)
return_error(gs_error_VMerror);
pcs->params.pattern.has_base_space = false;
code = pcs->type->remap_color(&cc, pcs, &devc, pgs,
pgs->device, gs_color_select_texture);
if (code >= 0) {
gx_device *dev = pgs->device;
bool need_path = !dev_proc(dev, dev_spec_op)(dev,
gxdso_pattern_shfill_doesnt_need_path, NULL, 0);
if (need_path) {
gx_path cpath;
gx_path_init_local(&cpath, pgs->memory);
code = gx_cpath_to_path(pgs->clip_path, &cpath);
if (code >= 0)
code = gx_fill_path(&cpath, &devc, pgs, gx_rule_winding_number,
pgs->fill_adjust.x, pgs->fill_adjust.y);
gx_path_free(&cpath, "gs_shfill");
} else
code = gx_fill_path(NULL, &devc, pgs, gx_rule_winding_number,
pgs->fill_adjust.x, pgs->fill_adjust.y);
}
rc_decrement_cs(pcs, "gs_shfill");
gs_pattern_reference(&cc, -1);
return code;
}
