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cairo-pdf-operators.c
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/* -*- Mode: c; tab-width: 8; c-basic-offset: 4; indent-tabs-mode: t; -*- */
/* cairo - a vector graphics library with display and print output
*
* Copyright © 2004 Red Hat, Inc
* Copyright © 2006 Red Hat, Inc
* Copyright © 2007, 2008 Adrian Johnson
*
* This library is free software; you can redistribute it and/or
* modify it either under the terms of the GNU Lesser General Public
* License version 2.1 as published by the Free Software Foundation
* (the "LGPL") or, at your option, under the terms of the Mozilla
* Public License Version 1.1 (the "MPL"). If you do not alter this
* notice, a recipient may use your version of this file under either
* the MPL or the LGPL.
*
* You should have received a copy of the LGPL along with this library
* in the file COPYING-LGPL-2.1; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
* You should have received a copy of the MPL along with this library
* in the file COPYING-MPL-1.1
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
* OF ANY KIND, either express or implied. See the LGPL or the MPL for
* the specific language governing rights and limitations.
*
* The Original Code is the cairo graphics library.
*
* The Initial Developer of the Original Code is University of Southern
* California.
*
* Contributor(s):
* Kristian Høgsberg <[email protected]>
* Carl Worth <[email protected]>
* Adrian Johnson <[email protected]>
*/
#include "cairoint.h"
#if CAIRO_HAS_PDF_OPERATORS
#include "cairo-error-private.h"
#include "cairo-pdf-operators-private.h"
#include "cairo-path-fixed-private.h"
#include "cairo-output-stream-private.h"
#include "cairo-scaled-font-subsets-private.h"
static cairo_status_t
_cairo_pdf_operators_end_text (cairo_pdf_operators_t *pdf_operators);
void
_cairo_pdf_operators_init (cairo_pdf_operators_t *pdf_operators,
cairo_output_stream_t *stream,
cairo_matrix_t *cairo_to_pdf,
cairo_scaled_font_subsets_t *font_subsets)
{
pdf_operators->stream = stream;
pdf_operators->cairo_to_pdf = *cairo_to_pdf;
pdf_operators->font_subsets = font_subsets;
pdf_operators->use_font_subset = NULL;
pdf_operators->use_font_subset_closure = NULL;
pdf_operators->in_text_object = FALSE;
pdf_operators->num_glyphs = 0;
pdf_operators->has_line_style = FALSE;
pdf_operators->use_actual_text = FALSE;
}
cairo_status_t
_cairo_pdf_operators_fini (cairo_pdf_operators_t *pdf_operators)
{
return _cairo_pdf_operators_flush (pdf_operators);
}
void
_cairo_pdf_operators_set_font_subsets_callback (cairo_pdf_operators_t *pdf_operators,
cairo_pdf_operators_use_font_subset_t use_font_subset,
void *closure)
{
pdf_operators->use_font_subset = use_font_subset;
pdf_operators->use_font_subset_closure = closure;
}
/* Change the output stream to a different stream.
* _cairo_pdf_operators_flush() should always be called before calling
* this function.
*/
void
_cairo_pdf_operators_set_stream (cairo_pdf_operators_t *pdf_operators,
cairo_output_stream_t *stream)
{
pdf_operators->stream = stream;
pdf_operators->has_line_style = FALSE;
}
void
_cairo_pdf_operators_set_cairo_to_pdf_matrix (cairo_pdf_operators_t *pdf_operators,
cairo_matrix_t *cairo_to_pdf)
{
pdf_operators->cairo_to_pdf = *cairo_to_pdf;
pdf_operators->has_line_style = FALSE;
}
cairo_private void
_cairo_pdf_operators_enable_actual_text (cairo_pdf_operators_t *pdf_operators,
cairo_bool_t enable)
{
pdf_operators->use_actual_text = enable;
}
/* Finish writing out any pending commands to the stream. This
* function must be called by the surface before emitting anything
* into the PDF stream.
*
* pdf_operators may leave the emitted PDF for some operations
* unfinished in case subsequent operations can be merged. This
* function will finish off any incomplete operation so the stream
* will be in a state where the surface may emit its own PDF
* operations (eg changing patterns).
*
*/
cairo_status_t
_cairo_pdf_operators_flush (cairo_pdf_operators_t *pdf_operators)
{
cairo_status_t status = CAIRO_STATUS_SUCCESS;
if (pdf_operators->in_text_object)
status = _cairo_pdf_operators_end_text (pdf_operators);
return status;
}
/* Reset the known graphics state of the PDF consumer. ie no
* assumptions will be made about the state. The next time a
* particular graphics state is required (eg line width) the state
* operator is always emitted and then remembered for subsequent
* operatations.
*
* This should be called when starting a new stream or after emitting
* the 'Q' operator (where pdf-operators functions were called inside
* the q/Q pair).
*/
void
_cairo_pdf_operators_reset (cairo_pdf_operators_t *pdf_operators)
{
pdf_operators->has_line_style = FALSE;
}
/* A word wrap stream can be used as a filter to do word wrapping on
* top of an existing output stream. The word wrapping is quite
* simple, using isspace to determine characters that separate
* words. Any word that will cause the column count exceed the given
* max_column will have a '\n' character emitted before it.
*
* The stream is careful to maintain integrity for words that cross
* the boundary from one call to write to the next.
*
* Note: This stream does not guarantee that the output will never
* exceed max_column. In particular, if a single word is larger than
* max_column it will not be broken up.
*/
typedef enum _cairo_word_wrap_state {
WRAP_STATE_DELIMITER,
WRAP_STATE_WORD,
WRAP_STATE_STRING,
WRAP_STATE_HEXSTRING
} cairo_word_wrap_state_t;
typedef struct _word_wrap_stream {
cairo_output_stream_t base;
cairo_output_stream_t *output;
int max_column;
int column;
cairo_word_wrap_state_t state;
cairo_bool_t in_escape;
int escape_digits;
} word_wrap_stream_t;
/* Emit word bytes up to the next delimiter character */
static int
_word_wrap_stream_count_word_up_to (word_wrap_stream_t *stream,
const unsigned char *data, int length)
{
const unsigned char *s = data;
int count = 0;
while (length--) {
if (_cairo_isspace (*s) || *s == '<' || *s == '(') {
stream->state = WRAP_STATE_DELIMITER;
break;
}
count++;
stream->column++;
s++;
}
if (count)
_cairo_output_stream_write (stream->output, data, count);
return count;
}
/* Emit hexstring bytes up to either the end of the ASCII hexstring or the number
* of columns remaining.
*/
static int
_word_wrap_stream_count_hexstring_up_to (word_wrap_stream_t *stream,
const unsigned char *data, int length)
{
const unsigned char *s = data;
int count = 0;
cairo_bool_t newline = FALSE;
while (length--) {
count++;
stream->column++;
if (*s == '>') {
stream->state = WRAP_STATE_DELIMITER;
break;
}
if (stream->column > stream->max_column) {
newline = TRUE;
break;
}
s++;
}
if (count)
_cairo_output_stream_write (stream->output, data, count);
if (newline) {
_cairo_output_stream_printf (stream->output, "\n");
stream->column = 0;
}
return count;
}
/* Count up to either the end of the string or the number of columns
* remaining.
*/
static int
_word_wrap_stream_count_string_up_to (word_wrap_stream_t *stream,
const unsigned char *data, int length)
{
const unsigned char *s = data;
int count = 0;
cairo_bool_t newline = FALSE;
while (length--) {
count++;
stream->column++;
if (!stream->in_escape) {
if (*s == ')') {
stream->state = WRAP_STATE_DELIMITER;
break;
}
if (*s == '\\') {
stream->in_escape = TRUE;
stream->escape_digits = 0;
} else if (stream->column > stream->max_column) {
newline = TRUE;
break;
}
} else {
if (!_cairo_isdigit(*s) || ++stream->escape_digits == 3)
stream->in_escape = FALSE;
}
s++;
}
if (count)
_cairo_output_stream_write (stream->output, data, count);
if (newline) {
_cairo_output_stream_printf (stream->output, "\\\n");
stream->column = 0;
}
return count;
}
static cairo_status_t
_word_wrap_stream_write (cairo_output_stream_t *base,
const unsigned char *data,
unsigned int length)
{
word_wrap_stream_t *stream = (word_wrap_stream_t *) base;
int count;
while (length) {
switch (stream->state) {
case WRAP_STATE_WORD:
count = _word_wrap_stream_count_word_up_to (stream, data, length);
break;
case WRAP_STATE_HEXSTRING:
count = _word_wrap_stream_count_hexstring_up_to (stream, data, length);
break;
case WRAP_STATE_STRING:
count = _word_wrap_stream_count_string_up_to (stream, data, length);
break;
case WRAP_STATE_DELIMITER:
count = 1;
stream->column++;
if (*data == '\n' || stream->column >= stream->max_column) {
_cairo_output_stream_printf (stream->output, "\n");
stream->column = 0;
} else if (*data == '<') {
stream->state = WRAP_STATE_HEXSTRING;
} else if (*data == '(') {
stream->state = WRAP_STATE_STRING;
} else if (!_cairo_isspace (*data)) {
stream->state = WRAP_STATE_WORD;
}
if (*data != '\n')
_cairo_output_stream_write (stream->output, data, 1);
break;
default:
ASSERT_NOT_REACHED;
count = length;
break;
}
data += count;
length -= count;
}
return _cairo_output_stream_get_status (stream->output);
}
static cairo_status_t
_word_wrap_stream_close (cairo_output_stream_t *base)
{
word_wrap_stream_t *stream = (word_wrap_stream_t *) base;
return _cairo_output_stream_get_status (stream->output);
}
static cairo_output_stream_t *
_word_wrap_stream_create (cairo_output_stream_t *output, int max_column)
{
word_wrap_stream_t *stream;
if (output->status)
return _cairo_output_stream_create_in_error (output->status);
stream = malloc (sizeof (word_wrap_stream_t));
if (unlikely (stream == NULL)) {
_cairo_error_throw (CAIRO_STATUS_NO_MEMORY);
return (cairo_output_stream_t *) &_cairo_output_stream_nil;
}
_cairo_output_stream_init (&stream->base,
_word_wrap_stream_write,
NULL,
_word_wrap_stream_close);
stream->output = output;
stream->max_column = max_column;
stream->column = 0;
stream->state = WRAP_STATE_DELIMITER;
stream->in_escape = FALSE;
stream->escape_digits = 0;
return &stream->base;
}
typedef struct _pdf_path_info {
cairo_output_stream_t *output;
cairo_matrix_t *path_transform;
cairo_line_cap_t line_cap;
cairo_point_t last_move_to_point;
cairo_bool_t has_sub_path;
} pdf_path_info_t;
static cairo_status_t
_cairo_pdf_path_move_to (void *closure,
const cairo_point_t *point)
{
pdf_path_info_t *info = closure;
double x = _cairo_fixed_to_double (point->x);
double y = _cairo_fixed_to_double (point->y);
info->last_move_to_point = *point;
info->has_sub_path = FALSE;
cairo_matrix_transform_point (info->path_transform, &x, &y);
_cairo_output_stream_printf (info->output,
"%g %g m ", x, y);
return _cairo_output_stream_get_status (info->output);
}
static cairo_status_t
_cairo_pdf_path_line_to (void *closure,
const cairo_point_t *point)
{
pdf_path_info_t *info = closure;
double x = _cairo_fixed_to_double (point->x);
double y = _cairo_fixed_to_double (point->y);
if (info->line_cap != CAIRO_LINE_CAP_ROUND &&
! info->has_sub_path &&
point->x == info->last_move_to_point.x &&
point->y == info->last_move_to_point.y)
{
return CAIRO_STATUS_SUCCESS;
}
info->has_sub_path = TRUE;
cairo_matrix_transform_point (info->path_transform, &x, &y);
_cairo_output_stream_printf (info->output,
"%g %g l ", x, y);
return _cairo_output_stream_get_status (info->output);
}
static cairo_status_t
_cairo_pdf_path_curve_to (void *closure,
const cairo_point_t *b,
const cairo_point_t *c,
const cairo_point_t *d)
{
pdf_path_info_t *info = closure;
double bx = _cairo_fixed_to_double (b->x);
double by = _cairo_fixed_to_double (b->y);
double cx = _cairo_fixed_to_double (c->x);
double cy = _cairo_fixed_to_double (c->y);
double dx = _cairo_fixed_to_double (d->x);
double dy = _cairo_fixed_to_double (d->y);
info->has_sub_path = TRUE;
cairo_matrix_transform_point (info->path_transform, &bx, &by);
cairo_matrix_transform_point (info->path_transform, &cx, &cy);
cairo_matrix_transform_point (info->path_transform, &dx, &dy);
_cairo_output_stream_printf (info->output,
"%g %g %g %g %g %g c ",
bx, by, cx, cy, dx, dy);
return _cairo_output_stream_get_status (info->output);
}
static cairo_status_t
_cairo_pdf_path_close_path (void *closure)
{
pdf_path_info_t *info = closure;
if (info->line_cap != CAIRO_LINE_CAP_ROUND &&
! info->has_sub_path)
{
return CAIRO_STATUS_SUCCESS;
}
_cairo_output_stream_printf (info->output,
"h\n");
return _cairo_output_stream_get_status (info->output);
}
static cairo_status_t
_cairo_pdf_path_rectangle (pdf_path_info_t *info, cairo_box_t *box)
{
double x1 = _cairo_fixed_to_double (box->p1.x);
double y1 = _cairo_fixed_to_double (box->p1.y);
double x2 = _cairo_fixed_to_double (box->p2.x);
double y2 = _cairo_fixed_to_double (box->p2.y);
cairo_matrix_transform_point (info->path_transform, &x1, &y1);
cairo_matrix_transform_point (info->path_transform, &x2, &y2);
_cairo_output_stream_printf (info->output,
"%g %g %g %g re ",
x1, y1, x2 - x1, y2 - y1);
return _cairo_output_stream_get_status (info->output);
}
/* The line cap value is needed to workaround the fact that PostScript
* and PDF semantics for stroking degenerate sub-paths do not match
* cairo semantics. (PostScript draws something for any line cap
* value, while cairo draws something only for round caps).
*
* When using this function to emit a path to be filled, rather than
* stroked, simply pass %CAIRO_LINE_CAP_ROUND which will guarantee that
* the stroke workaround will not modify the path being emitted.
*/
static cairo_status_t
_cairo_pdf_operators_emit_path (cairo_pdf_operators_t *pdf_operators,
const cairo_path_fixed_t*path,
cairo_matrix_t *path_transform,
cairo_line_cap_t line_cap)
{
cairo_output_stream_t *word_wrap;
cairo_status_t status, status2;
pdf_path_info_t info;
cairo_box_t box;
word_wrap = _word_wrap_stream_create (pdf_operators->stream, 72);
status = _cairo_output_stream_get_status (word_wrap);
if (unlikely (status))
return _cairo_output_stream_destroy (word_wrap);
info.output = word_wrap;
info.path_transform = path_transform;
info.line_cap = line_cap;
if (_cairo_path_fixed_is_rectangle (path, &box)) {
status = _cairo_pdf_path_rectangle (&info, &box);
} else {
status = _cairo_path_fixed_interpret (path,
_cairo_pdf_path_move_to,
_cairo_pdf_path_line_to,
_cairo_pdf_path_curve_to,
_cairo_pdf_path_close_path,
&info);
}
status2 = _cairo_output_stream_destroy (word_wrap);
if (status == CAIRO_STATUS_SUCCESS)
status = status2;
return status;
}
cairo_int_status_t
_cairo_pdf_operators_clip (cairo_pdf_operators_t *pdf_operators,
const cairo_path_fixed_t *path,
cairo_fill_rule_t fill_rule)
{
const char *pdf_operator;
cairo_status_t status;
if (pdf_operators->in_text_object) {
status = _cairo_pdf_operators_end_text (pdf_operators);
if (unlikely (status))
return status;
}
if (! path->has_current_point) {
/* construct an empty path */
_cairo_output_stream_printf (pdf_operators->stream, "0 0 m ");
} else {
status = _cairo_pdf_operators_emit_path (pdf_operators,
path,
&pdf_operators->cairo_to_pdf,
CAIRO_LINE_CAP_ROUND);
if (unlikely (status))
return status;
}
switch (fill_rule) {
default:
ASSERT_NOT_REACHED;
case CAIRO_FILL_RULE_WINDING:
pdf_operator = "W";
break;
case CAIRO_FILL_RULE_EVEN_ODD:
pdf_operator = "W*";
break;
}
_cairo_output_stream_printf (pdf_operators->stream,
"%s n\n",
pdf_operator);
return _cairo_output_stream_get_status (pdf_operators->stream);
}
static int
_cairo_pdf_line_cap (cairo_line_cap_t cap)
{
switch (cap) {
case CAIRO_LINE_CAP_BUTT:
return 0;
case CAIRO_LINE_CAP_ROUND:
return 1;
case CAIRO_LINE_CAP_SQUARE:
return 2;
default:
ASSERT_NOT_REACHED;
return 0;
}
}
static int
_cairo_pdf_line_join (cairo_line_join_t join)
{
switch (join) {
case CAIRO_LINE_JOIN_MITER:
return 0;
case CAIRO_LINE_JOIN_ROUND:
return 1;
case CAIRO_LINE_JOIN_BEVEL:
return 2;
default:
ASSERT_NOT_REACHED;
return 0;
}
}
cairo_int_status_t
_cairo_pdf_operators_emit_stroke_style (cairo_pdf_operators_t *pdf_operators,
const cairo_stroke_style_t *style,
double scale)
{
double *dash = style->dash;
int num_dashes = style->num_dashes;
double dash_offset = style->dash_offset;
double line_width = style->line_width * scale;
/* PostScript has "special needs" when it comes to zero-length
* dash segments with butt caps. It apparently (at least
* according to ghostscript) draws hairlines for this
* case. That's not what the cairo semantics want, so we first
* touch up the array to eliminate any 0.0 values that will
* result in "on" segments.
*/
if (num_dashes && style->line_cap == CAIRO_LINE_CAP_BUTT) {
int i;
/* If there's an odd number of dash values they will each get
* interpreted as both on and off. So we first explicitly
* expand the array to remove the duplicate usage so that we
* can modify some of the values.
*/
if (num_dashes % 2) {
dash = _cairo_malloc_abc (num_dashes, 2, sizeof (double));
if (unlikely (dash == NULL))
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
memcpy (dash, style->dash, num_dashes * sizeof (double));
memcpy (dash + num_dashes, style->dash, num_dashes * sizeof (double));
num_dashes *= 2;
}
for (i = 0; i < num_dashes; i += 2) {
if (dash[i] == 0.0) {
/* Do not modify the dashes in-place, as we may need to also
* replay this stroke to an image fallback.
*/
if (dash == style->dash) {
dash = _cairo_malloc_ab (num_dashes, sizeof (double));
if (unlikely (dash == NULL))
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
memcpy (dash, style->dash, num_dashes * sizeof (double));
}
/* If we're at the front of the list, we first rotate
* two elements from the end of the list to the front
* of the list before folding away the 0.0. Or, if
* there are only two dash elements, then there is
* nothing at all to draw.
*/
if (i == 0) {
double last_two[2];
if (num_dashes == 2) {
free (dash);
return CAIRO_INT_STATUS_NOTHING_TO_DO;
}
/* The cases of num_dashes == 0, 1, or 3 elements
* cannot exist, so the rotation of 2 elements
* will always be safe */
memcpy (last_two, dash + num_dashes - 2, sizeof (last_two));
memmove (dash + 2, dash, (num_dashes - 2) * sizeof (double));
memcpy (dash, last_two, sizeof (last_two));
dash_offset += dash[0] + dash[1];
i = 2;
}
dash[i-1] += dash[i+1];
num_dashes -= 2;
memmove (dash + i, dash + i + 2, (num_dashes - i) * sizeof (double));
/* If we might have just rotated, it's possible that
* we rotated a 0.0 value to the front of the list.
* Set i to -2 so it will get incremented to 0. */
if (i == 2)
i = -2;
}
}
}
if (!pdf_operators->has_line_style || pdf_operators->line_width != line_width) {
_cairo_output_stream_printf (pdf_operators->stream,
"%f w\n",
line_width);
pdf_operators->line_width = line_width;
}
if (!pdf_operators->has_line_style || pdf_operators->line_cap != style->line_cap) {
_cairo_output_stream_printf (pdf_operators->stream,
"%d J\n",
_cairo_pdf_line_cap (style->line_cap));
pdf_operators->line_cap = style->line_cap;
}
if (!pdf_operators->has_line_style || pdf_operators->line_join != style->line_join) {
_cairo_output_stream_printf (pdf_operators->stream,
"%d j\n",
_cairo_pdf_line_join (style->line_join));
pdf_operators->line_join = style->line_join;
}
if (num_dashes) {
int d;
_cairo_output_stream_printf (pdf_operators->stream, "[");
for (d = 0; d < num_dashes; d++)
_cairo_output_stream_printf (pdf_operators->stream, " %f", dash[d] * scale);
_cairo_output_stream_printf (pdf_operators->stream, "] %f d\n",
dash_offset * scale);
pdf_operators->has_dashes = TRUE;
} else if (!pdf_operators->has_line_style || pdf_operators->has_dashes) {
_cairo_output_stream_printf (pdf_operators->stream, "[] 0.0 d\n");
pdf_operators->has_dashes = FALSE;
}
if (dash != style->dash)
free (dash);
if (!pdf_operators->has_line_style || pdf_operators->miter_limit != style->miter_limit) {
_cairo_output_stream_printf (pdf_operators->stream,
"%f M ",
style->miter_limit < 1.0 ? 1.0 : style->miter_limit);
pdf_operators->miter_limit = style->miter_limit;
}
pdf_operators->has_line_style = TRUE;
return _cairo_output_stream_get_status (pdf_operators->stream);
}
/* Scale the matrix so the largest absolute value of the non
* translation components is 1.0. Return the scale required to restore
* the matrix to the original values.
*
* eg the matrix [ 100 0 0 50 20 10 ]
*
* is rescaled to [ 1 0 0 0.5 0.2 0.1 ]
* and the scale returned is 100
*/
static void
_cairo_matrix_factor_out_scale (cairo_matrix_t *m, double *scale)
{
double s;
s = fabs (m->xx);
if (fabs (m->xy) > s)
s = fabs (m->xy);
if (fabs (m->yx) > s)
s = fabs (m->yx);
if (fabs (m->yy) > s)
s = fabs (m->yy);
*scale = s;
s = 1.0/s;
cairo_matrix_scale (m, s, s);
}
static cairo_int_status_t
_cairo_pdf_operators_emit_stroke (cairo_pdf_operators_t *pdf_operators,
const cairo_path_fixed_t *path,
const cairo_stroke_style_t *style,
const cairo_matrix_t *ctm,
const cairo_matrix_t *ctm_inverse,
const char *pdf_operator)
{
cairo_int_status_t status;
cairo_matrix_t m, path_transform;
cairo_bool_t has_ctm = TRUE;
double scale = 1.0;
if (pdf_operators->in_text_object) {
status = _cairo_pdf_operators_end_text (pdf_operators);
if (unlikely (status))
return status;
}
/* Optimize away the stroke ctm when it does not affect the
* stroke. There are other ctm cases that could be optimized
* however this is the most common.
*/
if (fabs(ctm->xx) == 1.0 && fabs(ctm->yy) == 1.0 &&
fabs(ctm->xy) == 0.0 && fabs(ctm->yx) == 0.0)
{
has_ctm = FALSE;
}
/* The PDF CTM is transformed to the user space CTM when stroking
* so the corect pen shape will be used. This also requires that
* the path be transformed to user space when emitted. The
* conversion of path coordinates to user space may cause rounding
* errors. For example the device space point (1.234, 3.142) when
* transformed to a user space CTM of [100 0 0 100 0 0] will be
* emitted as (0.012, 0.031).
*
* To avoid the rounding problem we scale the user space CTM
* matrix so that all the non translation components of the matrix
* are <= 1. The line width and and dashes are scaled by the
* inverse of the scale applied to the CTM. This maintains the
* shape of the stroke pen while keeping the user space CTM within
* the range that maximizes the precision of the emitted path.
*/
if (has_ctm) {
m = *ctm;
/* Zero out the translation since it does not affect the pen
* shape however it may cause unnecessary digits to be emitted.
*/
m.x0 = 0.0;
m.y0 = 0.0;
_cairo_matrix_factor_out_scale (&m, &scale);
path_transform = m;
status = cairo_matrix_invert (&path_transform);
if (unlikely (status))
return status;
cairo_matrix_multiply (&m, &m, &pdf_operators->cairo_to_pdf);
}
status = _cairo_pdf_operators_emit_stroke_style (pdf_operators, style, scale);
if (status == CAIRO_INT_STATUS_NOTHING_TO_DO)
return CAIRO_STATUS_SUCCESS;
if (unlikely (status))
return status;
if (has_ctm) {
_cairo_output_stream_printf (pdf_operators->stream,
"q %f %f %f %f %f %f cm\n",
m.xx, m.yx, m.xy, m.yy,
m.x0, m.y0);
} else {
path_transform = pdf_operators->cairo_to_pdf;
}
status = _cairo_pdf_operators_emit_path (pdf_operators,
path,
&path_transform,
style->line_cap);
if (unlikely (status))
return status;
_cairo_output_stream_printf (pdf_operators->stream, "%s", pdf_operator);
if (has_ctm)
_cairo_output_stream_printf (pdf_operators->stream, " Q");
_cairo_output_stream_printf (pdf_operators->stream, "\n");
return _cairo_output_stream_get_status (pdf_operators->stream);
}
cairo_int_status_t
_cairo_pdf_operators_stroke (cairo_pdf_operators_t *pdf_operators,
const cairo_path_fixed_t *path,
const cairo_stroke_style_t *style,
const cairo_matrix_t *ctm,
const cairo_matrix_t *ctm_inverse)
{
return _cairo_pdf_operators_emit_stroke (pdf_operators,
path,
style,
ctm,
ctm_inverse,
"S");
}
cairo_int_status_t
_cairo_pdf_operators_fill (cairo_pdf_operators_t *pdf_operators,
const cairo_path_fixed_t *path,
cairo_fill_rule_t fill_rule)
{
const char *pdf_operator;
cairo_status_t status;
if (pdf_operators->in_text_object) {
status = _cairo_pdf_operators_end_text (pdf_operators);
if (unlikely (status))
return status;
}
status = _cairo_pdf_operators_emit_path (pdf_operators,
path,
&pdf_operators->cairo_to_pdf,
CAIRO_LINE_CAP_ROUND);
if (unlikely (status))
return status;
switch (fill_rule) {
default:
ASSERT_NOT_REACHED;
case CAIRO_FILL_RULE_WINDING:
pdf_operator = "f";
break;
case CAIRO_FILL_RULE_EVEN_ODD:
pdf_operator = "f*";
break;
}
_cairo_output_stream_printf (pdf_operators->stream,
"%s\n",
pdf_operator);
return _cairo_output_stream_get_status (pdf_operators->stream);
}
cairo_int_status_t
_cairo_pdf_operators_fill_stroke (cairo_pdf_operators_t *pdf_operators,
const cairo_path_fixed_t *path,
cairo_fill_rule_t fill_rule,
const cairo_stroke_style_t *style,
const cairo_matrix_t *ctm,
const cairo_matrix_t *ctm_inverse)
{
const char *operator;
switch (fill_rule) {
default:
ASSERT_NOT_REACHED;
case CAIRO_FILL_RULE_WINDING:
operator = "B";
break;
case CAIRO_FILL_RULE_EVEN_ODD:
operator = "B*";
break;
}
return _cairo_pdf_operators_emit_stroke (pdf_operators,
path,
style,
ctm,
ctm_inverse,
operator);
}
static void
_cairo_pdf_operators_emit_glyph_index (cairo_pdf_operators_t *pdf_operators,
cairo_output_stream_t *stream,
unsigned int glyph)
{
if (pdf_operators->is_latin) {
if (glyph == '(' || glyph == ')' || glyph == '\\')
_cairo_output_stream_printf (stream, "\\%c", glyph);
else if (glyph >= 0x20 && glyph <= 0x7e)
_cairo_output_stream_printf (stream, "%c", glyph);
else
_cairo_output_stream_printf (stream, "\\%03o", glyph);
} else {
_cairo_output_stream_printf (stream,
"%0*x",
pdf_operators->hex_width,
glyph);
}
}
#define GLYPH_POSITION_TOLERANCE 0.001
/* Emit the string of glyphs using the 'Tj' operator. This requires
* that the glyphs are positioned at their natural glyph advances. */
static cairo_status_t
_cairo_pdf_operators_emit_glyph_string (cairo_pdf_operators_t *pdf_operators,
cairo_output_stream_t *stream)
{
int i;
_cairo_output_stream_printf (stream, "%s", pdf_operators->is_latin ? "(" : "<");
for (i = 0; i < pdf_operators->num_glyphs; i++) {
_cairo_pdf_operators_emit_glyph_index (pdf_operators,
stream,
pdf_operators->glyphs[i].glyph_index);
pdf_operators->cur_x += pdf_operators->glyphs[i].x_advance;
}
_cairo_output_stream_printf (stream, "%sTj\n", pdf_operators->is_latin ? ")" : ">");
return _cairo_output_stream_get_status (stream);
}
/* Emit the string of glyphs using the 'TJ' operator.
*
* The TJ operator takes an array of strings of glyphs. Each string of
* glyphs is displayed using the glyph advances of each glyph to
* position the glyphs. A relative adjustment to the glyph advance may
* be specified by including the adjustment between two strings. The
* adjustment is in units of text space * -1000.
*/
static cairo_status_t
_cairo_pdf_operators_emit_glyph_string_with_positioning (
cairo_pdf_operators_t *pdf_operators,
cairo_output_stream_t *stream)
{
int i;
_cairo_output_stream_printf (stream, "[%s", pdf_operators->is_latin ? "(" : "<");
for (i = 0; i < pdf_operators->num_glyphs; i++) {
if (pdf_operators->glyphs[i].x_position != pdf_operators->cur_x)
{
double delta = pdf_operators->glyphs[i].x_position - pdf_operators->cur_x;
int rounded_delta;