int eprn_set_page_layout(eprn_Device *dev)
{
bool
no_match = true,
/* Are the requested flags supported for some size? */
landscape = dev->MediaSize[0] > dev->MediaSize[1];
/* It's not documented, but 'MediaSize' is the requested "PageSize" page
device parameter value and hence is to be interpreted in default (not
default default!) user space. */
const char *epref = dev->eprn.CUPS_messages? CUPS_ERRPREF: "";
const eprn_CustomPageDescription
*best_cmatch = NULL; /* best custom page size match */
eprn_Eprn
*eprn = &dev->eprn;
const eprn_PageDescription
*best_cdmatch = NULL, /* best custom page size match in discrete list*/
*best_dmatch = NULL, /* best discrete match */
*pd; /* loop variable */
float
/* Page width and height in bp with w <= h (in a moment): */
w = dev->MediaSize[0],
h = dev->MediaSize[1],
/* pixmap device space margins in bp (canonical order): */
margins[4];
int
quarters;
ms_MediaCode
desired = eprn->desired_flags;
#ifdef EPRN_TRACE
if_debug3(EPRN_TRACE_CHAR,
"! eprn_set_page_layout(): PageSize = [%.0f %.0f], "
"desired_flags = 0x%04X.\n",
dev->MediaSize[0], dev->MediaSize[1], (unsigned int)desired);
#endif
/* Ensure w <= h */
if (w > h) {
float temp;
temp = w; w = h; h = temp;
/* This has effectively split 'MediaSize[]' into 'w', 'h' and 'landscape'.
*/
}
/* Initialization of primary return value */
eprn->code = ms_none;
/* Put the LeadingEdge value into the desired flag pattern if it's set */
if (eprn->leading_edge_set) {
if (eprn->default_orientation % 2 == 0) /* true on short edge first */
desired &= ~MS_TRANSVERSE_FLAG;
else
desired |= MS_TRANSVERSE_FLAG;
}
/* Find best match in discrete sizes */
if (eprn->media_overrides == NULL) pd = eprn->cap->sizes;
else pd = eprn->media_overrides;
while (pd->code != ms_none) {
const ms_SizeDescription *ms = ms_find_size_from_code(pd->code);
if (ms->dimen[0] > 0.0 /* ignore variable sizes */ &&
fabs(w - ms->dimen[0]) <= 5.0 &&
fabs(h - ms->dimen[1]) <= 5.0) {
/* The size does match at 5 bp tolerance. This value has been chosen
arbitrarily to be equal to PostScript's PageSize matching tolerance
during media selection. The tolerance should really be that at which
the printer in question distinguishes between sizes or smaller than
that in order to at least prevent printing on unsupported sizes.
*/
if (best_dmatch == NULL ||
better_flag_match(desired, eprn->optional_flags, best_dmatch->code,
pd->code))
best_dmatch = pd;
if (flag_match(desired, eprn->optional_flags, pd->code))
no_match = false;
}
pd++;
}
/* Next find the best match among the custom size descriptions */
if (eprn->cap->custom != NULL) {
const eprn_CustomPageDescription *cp = eprn->cap->custom;
/* First check whether the size is in the supported range */
while (cp->width_max > 0.0) {
if (cp->width_min <= w && w <= cp->width_max &&
cp->height_min <= h && h <= cp->height_max) {
/* The size does match. */
if (best_cmatch == NULL ||
better_flag_match(desired, eprn->optional_flags, best_cmatch->code,
cp->code))
best_cmatch = cp;
if (eprn->media_overrides == NULL &&
flag_match(desired, eprn->optional_flags, cp->code))
no_match = false;
}
cp++;
}
/* If we have read a media configuration file, the flags to be matched
must be sought in 'media_overrides'. */
if (best_cmatch != NULL && eprn->media_overrides != NULL) {
for (pd = eprn->media_overrides; pd->code != ms_none; pd++) {
if (ms_without_flags(pd->code) == ms_CustomPageSize) {
if (best_cdmatch == NULL ||
better_flag_match(desired, eprn->optional_flags,
best_cdmatch->code, pd->code))
best_cdmatch = pd;
if (flag_match(desired, eprn->optional_flags, pd->code))
no_match = false;
}
}
}
}
/* Now the 'best_*match' variables indicate for each of the categories of
page descriptions to which extent the size is supported at all (non-NULL
value) and what the best flag match in the category is. Here we now check
for NULL values, i.e., size matches. */
if (best_dmatch == NULL) {
/* No discrete match */
if (best_cmatch == NULL) {
/* No match at all. */
eprintf3("%s" ERRPREF
"This document requests a page size of %.0f x %.0f bp.\n",
epref, dev->MediaSize[0], dev->MediaSize[1]);
if (eprn->cap->custom == NULL) {
/* The printer does not support custom page sizes */
if (eprn->media_overrides != NULL)
eprintf1(
"%s The media configuration file does not contain an entry for "
" this size.\n", epref);
else
eprintf2("%s This size is not supported by the %s.\n",
epref, eprn->cap->name);
}
else
eprintf3(
"%s This size is not supported as a discrete size and it exceeds "
"the\n"
"%s custom page size limits for the %s.\n",
epref, epref, eprn->cap->name);
return -1;
}
if (eprn->media_overrides != NULL && best_cdmatch == NULL) {
eprintf6("%s" ERRPREF
"This document requests a page size of %.0f x %.0f bp\n"
"%s but there is no entry for this size in the "
"media configuration file\n"
"%s %s.\n",
epref, dev->MediaSize[0], dev->MediaSize[1], epref, epref,
eprn->media_file);
return -1;
}
}
/* Now we have: best_dmatch != NULL || best_cmatch != NULL &&
(eprn->media_overrides == NULL || best_cdmatch != NULL). */
/* Find a flag match among the size matches found so far */
{
ms_MediaCode custom_code = ms_none;
/* best custom page size match (either from cmatch or dcmatch) */
if (best_cmatch != NULL &&
(eprn->media_overrides == NULL || best_cdmatch != NULL))
custom_code = (eprn->media_overrides == NULL?
best_cmatch->code: best_cdmatch->code);
if (best_dmatch == NULL ||
best_cmatch != NULL &&
better_flag_match(desired, eprn->optional_flags, best_dmatch->code,
custom_code)) {
if (flag_match(desired, eprn->optional_flags, custom_code)) {
if (eprn->media_overrides == NULL) {
eprn->code = best_cmatch->code;
margins[0] = best_cmatch->left;
margins[1] = best_cmatch->bottom;
margins[2] = best_cmatch->right;
margins[3] = best_cmatch->top;
}
else {
eprn->code = best_cdmatch->code;
margins[0] = best_cdmatch->left;
margins[1] = best_cdmatch->bottom;
margins[2] = best_cdmatch->right;
margins[3] = best_cdmatch->top;
}
}
}
else {
if (flag_match(desired, eprn->optional_flags, best_dmatch->code)) {
eprn->code = best_dmatch->code;
margins[0] = best_dmatch->left;
margins[1] = best_dmatch->bottom;
margins[2] = best_dmatch->right;
margins[3] = best_dmatch->top;
}
}
}
/* If we've found a match, 'code' is no longer 'ms_none'. */
if (eprn->code == ms_none) {
eprn_flag_mismatch(eprn, no_match);
return -1;
}
/* Adapt the orientation of default default user space if not prescribed */
if (!eprn->leading_edge_set) {
if (eprn->code & MS_TRANSVERSE_FLAG) eprn->default_orientation = 3;
/* This leads to 0 if landscape orientation is requested. */
else eprn->default_orientation = 0;
}
/*
Now 'eprn->default_orientation % 2' describes the sheet's orientation in
pixmap device space. If this does not agree with the width and height
values in the device instance, we'll have to adapt them.
This is only necessary if there is a significant difference between width
and height.
*/
if (fabs(w - h) > 1 /* arbitrary */ &&
(eprn->default_orientation % 2 == 0) !=
(dev->width/dev->HWResolution[0] <= dev->height/dev->HWResolution[1])) {
bool reallocate = false;
#ifdef EPRN_TRACE
if_debug0(EPRN_TRACE_CHAR,
"! eprn_set_page_layout(): width-height change is necessary.\n");
#endif
/* Free old storage if the device is open */
if (dev->is_open) {
#ifdef EPRN_TRACE
if_debug0(EPRN_TRACE_CHAR, "! eprn_set_page_layout(): Device is open.\n");
#endif
reallocate = true;
/* One could try and call the allocation/reallocation routines of the
prn device directly, but they are not available in older ghostscript
versions and this method is safer anyway because it relies on a
documented API. */
gdev_prn_close((gx_device *)dev); /* ignore the result */
}
/* Now set width and height via gx_device_set_media_size(). This function
sets 'MediaSize[]', 'width', and 'height' based on the assumption that
default user space has a y axis which is vertical in pixmap device
space. This may be wrong and we have to fix it. Because fixing
'MediaSize[]' is simpler, gx_device_set_media_size() is called such
that it gives the correct values for 'width' and 'height'. */
if (eprn->default_orientation % 2 == 0) {
/* portrait orientation of the sheet in pixmap device space */
gx_device_set_media_size((gx_device *)dev, w, h);
if (landscape) {
dev->MediaSize[0] = h;
dev->MediaSize[1] = w;
}
}
else {
/* landscape orientation in pixmap device space (transverse) */
gx_device_set_media_size((gx_device *)dev, h, w);
if (!landscape) {
dev->MediaSize[0] = w;
dev->MediaSize[1] = h;
}
}
/* If the device is/was open, reallocate storage */
if (reallocate) {
int rc;
rc = gdev_prn_open((gx_device *)dev);
if (rc < 0) {
eprintf2("%s" ERRPREF
"Failure of gdev_prn_open(), code is %d.\n",
epref, rc);
return rc;
}
}
}
/* Increase the bottom margin for coloured modes except if it is exactly
zero */
if (eprn->colour_model != eprn_DeviceGray && margins[1] != 0.0)
margins[1] += eprn->cap->bottom_increment;
/* Number of +90-degree rotations needed for default user space: */
quarters = eprn->default_orientation;
if (landscape) quarters = (quarters + 1)%4;
/* Store the top and left margins in the device structure for use by
eprn_get_initial_matrix() and set the margins of the printable area if
we may.
gx_device_set_margins() (see gsdevice.c) copies the margins[] array to
HWMargins[] which is presumably to be interpreted in default user space
(see gs_initclip() in gspath.c), and if its second argument is true it
also modifies the offset variable Margins[]. The first property means
that gx_device_set_margins() can only be used if default user space and
pixmap device space have the same "up" direction, and the second
appropriates a parameter which is intended for the user.
*/
if (eprn->keep_margins) {
eprn->down_shift = dev->HWMargins[3 - quarters];
eprn->right_shift = dev->HWMargins[(4 - quarters)%4];
}
else {
int j;
eprn->down_shift = margins[3];
eprn->right_shift = margins[0];
if (quarters != 0) {
/* The "canonical margin order" for ghostscript is left, bottom, right,
top. Hence for, e.g., a +90-degree rotation ('quarters' is 1) of
default user space with respect to pixmap device space the left
margin (index 0) in default user space is actually the bottom margin
(index 1) in pixmap device space, the bottom margin is the right one,
etc.
*/
for (j = 0; j < 4; j++) dev->HWMargins[j] = margins[(j+quarters)%4];
/* 'HWMargins[]' is in bp (see gxdevcli.h) */
}
else {
/* Convert to inches */
for (j = 0; j < 4; j++) margins[j] /= BP_PER_IN;
gx_device_set_margins((gx_device *)dev, margins, false);
/* Of course, I could set HWMargins[] directly also in this case. This
way is however less prone to break on possible future incompatible
changes to ghostscript and it covers the most frequent case (portrait
and short edge first). */
}
}
return 0;
}
const ms_SizeDescription *pcl3_size_description(pcl_PageSize code)
{
return ms_find_size_from_code(pcl3_media_code(code));
}
