add cairo

1 files changed, 811 insertions, 0 deletions

diff --git a/libs/cairo-1.16.0/src/cairo-output-stream.c b/libs/cairo-1.16.0/src/cairo-output-stream.c
new file mode 100644
index 0000000..935fa44
--- /dev/null
+++ b/libs/cairo-1.16.0/src/cairo-output-stream.c
@@ -0,0 +1,811 @@
+/* cairo-output-stream.c: Output stream abstraction
+ *
+ * Copyright © 2005 Red Hat, Inc
+ *
+ * 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 Red Hat, Inc.
+ *
+ * Author(s):
+ *	Kristian Høgsberg <krh@redhat.com>
+ */
+
+#define _DEFAULT_SOURCE /* for snprintf() */
+#include "cairoint.h"
+
+#include "cairo-output-stream-private.h"
+
+#include "cairo-array-private.h"
+#include "cairo-error-private.h"
+#include "cairo-compiler-private.h"
+
+#include <stdio.h>
+#include <errno.h>
+
+/* Numbers printed with %f are printed with this number of significant
+ * digits after the decimal.
+ */
+#define SIGNIFICANT_DIGITS_AFTER_DECIMAL 6
+
+/* Numbers printed with %g are assumed to only have %CAIRO_FIXED_FRAC_BITS
+ * bits of precision available after the decimal point.
+ *
+ * FIXED_POINT_DECIMAL_DIGITS specifies the minimum number of decimal
+ * digits after the decimal point required to preserve the available
+ * precision.
+ *
+ * The conversion is:
+ *
+ * <programlisting>
+ * FIXED_POINT_DECIMAL_DIGITS = ceil( CAIRO_FIXED_FRAC_BITS * ln(2)/ln(10) )
+ * </programlisting>
+ *
+ * We can replace ceil(x) with (int)(x+1) since x will never be an
+ * integer for any likely value of %CAIRO_FIXED_FRAC_BITS.
+ */
+#define FIXED_POINT_DECIMAL_DIGITS ((int)(CAIRO_FIXED_FRAC_BITS*0.301029996 + 1))
+
+void
+_cairo_output_stream_init (cairo_output_stream_t            *stream,
+			   cairo_output_stream_write_func_t  write_func,
+			   cairo_output_stream_flush_func_t  flush_func,
+			   cairo_output_stream_close_func_t  close_func)
+{
+    stream->write_func = write_func;
+    stream->flush_func = flush_func;
+    stream->close_func = close_func;
+    stream->position = 0;
+    stream->status = CAIRO_STATUS_SUCCESS;
+    stream->closed = FALSE;
+}
+
+cairo_status_t
+_cairo_output_stream_fini (cairo_output_stream_t *stream)
+{
+    return _cairo_output_stream_close (stream);
+}
+
+const cairo_output_stream_t _cairo_output_stream_nil = {
+    NULL, /* write_func */
+    NULL, /* flush_func */
+    NULL, /* close_func */
+    0,    /* position */
+    CAIRO_STATUS_NO_MEMORY,
+    FALSE /* closed */
+};
+
+static const cairo_output_stream_t _cairo_output_stream_nil_write_error = {
+    NULL, /* write_func */
+    NULL, /* flush_func */
+    NULL, /* close_func */
+    0,    /* position */
+    CAIRO_STATUS_WRITE_ERROR,
+    FALSE /* closed */
+};
+
+typedef struct _cairo_output_stream_with_closure {
+    cairo_output_stream_t	 base;
+    cairo_write_func_t		 write_func;
+    cairo_close_func_t		 close_func;
+    void			*closure;
+} cairo_output_stream_with_closure_t;
+
+
+static cairo_status_t
+closure_write (cairo_output_stream_t *stream,
+	       const unsigned char *data, unsigned int length)
+{
+    cairo_output_stream_with_closure_t *stream_with_closure =
+	(cairo_output_stream_with_closure_t *) stream;
+
+    if (stream_with_closure->write_func == NULL)
+	return CAIRO_STATUS_SUCCESS;
+
+    return stream_with_closure->write_func (stream_with_closure->closure,
+					    data, length);
+}
+
+static cairo_status_t
+closure_close (cairo_output_stream_t *stream)
+{
+    cairo_output_stream_with_closure_t *stream_with_closure =
+	(cairo_output_stream_with_closure_t *) stream;
+
+    if (stream_with_closure->close_func != NULL)
+	return stream_with_closure->close_func (stream_with_closure->closure);
+    else
+	return CAIRO_STATUS_SUCCESS;
+}
+
+cairo_output_stream_t *
+_cairo_output_stream_create (cairo_write_func_t		write_func,
+			     cairo_close_func_t		close_func,
+			     void			*closure)
+{
+    cairo_output_stream_with_closure_t *stream;
+
+    stream = _cairo_malloc (sizeof (cairo_output_stream_with_closure_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,
+			       closure_write, NULL, closure_close);
+    stream->write_func = write_func;
+    stream->close_func = close_func;
+    stream->closure = closure;
+
+    return &stream->base;
+}
+
+cairo_output_stream_t *
+_cairo_output_stream_create_in_error (cairo_status_t status)
+{
+    cairo_output_stream_t *stream;
+
+    /* check for the common ones */
+    if (status == CAIRO_STATUS_NO_MEMORY)
+	return (cairo_output_stream_t *) &_cairo_output_stream_nil;
+    if (status == CAIRO_STATUS_WRITE_ERROR)
+	return (cairo_output_stream_t *) &_cairo_output_stream_nil_write_error;
+
+    stream = _cairo_malloc (sizeof (cairo_output_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, NULL, NULL, NULL);
+    stream->status = status;
+
+    return stream;
+}
+
+cairo_status_t
+_cairo_output_stream_flush (cairo_output_stream_t *stream)
+{
+    cairo_status_t status;
+
+    if (stream->closed)
+	return stream->status;
+
+    if (stream == &_cairo_output_stream_nil ||
+	stream == &_cairo_output_stream_nil_write_error)
+    {
+	return stream->status;
+    }
+
+    if (stream->flush_func) {
+	status = stream->flush_func (stream);
+	/* Don't overwrite a pre-existing status failure. */
+	if (stream->status == CAIRO_STATUS_SUCCESS)
+	    stream->status = status;
+    }
+
+    return stream->status;
+}
+
+cairo_status_t
+_cairo_output_stream_close (cairo_output_stream_t *stream)
+{
+    cairo_status_t status;
+
+    if (stream->closed)
+	return stream->status;
+
+    if (stream == &_cairo_output_stream_nil ||
+	stream == &_cairo_output_stream_nil_write_error)
+    {
+	return stream->status;
+    }
+
+    if (stream->close_func) {
+	status = stream->close_func (stream);
+	/* Don't overwrite a pre-existing status failure. */
+	if (stream->status == CAIRO_STATUS_SUCCESS)
+	    stream->status = status;
+    }
+
+    stream->closed = TRUE;
+
+    return stream->status;
+}
+
+cairo_status_t
+_cairo_output_stream_destroy (cairo_output_stream_t *stream)
+{
+    cairo_status_t status;
+
+    assert (stream != NULL);
+
+    if (stream == &_cairo_output_stream_nil ||
+	stream == &_cairo_output_stream_nil_write_error)
+    {
+	return stream->status;
+    }
+
+    status = _cairo_output_stream_fini (stream);
+    free (stream);
+
+    return status;
+}
+
+void
+_cairo_output_stream_write (cairo_output_stream_t *stream,
+			    const void *data, size_t length)
+{
+    if (length == 0)
+	return;
+
+    if (stream->status)
+	return;
+
+    stream->status = stream->write_func (stream, data, length);
+    stream->position += length;
+}
+
+void
+_cairo_output_stream_write_hex_string (cairo_output_stream_t *stream,
+				       const unsigned char *data,
+				       size_t length)
+{
+    const char hex_chars[] = "0123456789abcdef";
+    char buffer[2];
+    unsigned int i, column;
+
+    if (stream->status)
+	return;
+
+    for (i = 0, column = 0; i < length; i++, column++) {
+	if (column == 38) {
+	    _cairo_output_stream_write (stream, "\n", 1);
+	    column = 0;
+	}
+	buffer[0] = hex_chars[(data[i] >> 4) & 0x0f];
+	buffer[1] = hex_chars[data[i] & 0x0f];
+	_cairo_output_stream_write (stream, buffer, 2);
+    }
+}
+
+/* Format a double in a locale independent way and trim trailing
+ * zeros.  Based on code from Alex Larson <alexl@redhat.com>.
+ * https://mail.gnome.org/archives/gtk-devel-list/2001-October/msg00087.html
+ *
+ * The code in the patch is copyright Red Hat, Inc under the LGPL, but
+ * has been relicensed under the LGPL/MPL dual license for inclusion
+ * into cairo (see COPYING). -- Kristian Høgsberg <krh@redhat.com>
+ */
+static void
+_cairo_dtostr (char *buffer, size_t size, double d, cairo_bool_t limited_precision)
+{
+    const char *decimal_point;
+    int decimal_point_len;
+    char *p;
+    int decimal_len;
+    int num_zeros, decimal_digits;
+
+    /* Omit the minus sign from negative zero. */
+    if (d == 0.0)
+	d = 0.0;
+
+    decimal_point = _cairo_get_locale_decimal_point ();
+    decimal_point_len = strlen (decimal_point);
+
+    assert (decimal_point_len != 0);
+
+    if (limited_precision) {
+	snprintf (buffer, size, "%.*f", FIXED_POINT_DECIMAL_DIGITS, d);
+    } else {
+	/* Using "%f" to print numbers less than 0.1 will result in
+	 * reduced precision due to the default 6 digits after the
+	 * decimal point.
+	 *
+	 * For numbers is < 0.1, we print with maximum precision and count
+	 * the number of zeros between the decimal point and the first
+	 * significant digit. We then print the number again with the
+	 * number of decimal places that gives us the required number of
+	 * significant digits. This ensures the number is correctly
+	 * rounded.
+	 */
+	if (fabs (d) >= 0.1) {
+	    snprintf (buffer, size, "%f", d);
+	} else {
+	    snprintf (buffer, size, "%.18f", d);
+	    p = buffer;
+
+	    if (*p == '+' || *p == '-')
+		p++;
+
+	    while (_cairo_isdigit (*p))
+		p++;
+
+	    if (strncmp (p, decimal_point, decimal_point_len) == 0)
+		p += decimal_point_len;
+
+	    num_zeros = 0;
+	    while (*p++ == '0')
+		num_zeros++;
+
+	    decimal_digits = num_zeros + SIGNIFICANT_DIGITS_AFTER_DECIMAL;
+
+	    if (decimal_digits < 18)
+		snprintf (buffer, size, "%.*f", decimal_digits, d);
+	}
+    }
+    p = buffer;
+
+    if (*p == '+' || *p == '-')
+	p++;
+
+    while (_cairo_isdigit (*p))
+	p++;
+
+    if (strncmp (p, decimal_point, decimal_point_len) == 0) {
+	*p = '.';
+	decimal_len = strlen (p + decimal_point_len);
+	memmove (p + 1, p + decimal_point_len, decimal_len);
+	p[1 + decimal_len] = 0;
+
+	/* Remove trailing zeros and decimal point if possible. */
+	for (p = p + decimal_len; *p == '0'; p--)
+	    *p = 0;
+
+	if (*p == '.') {
+	    *p = 0;
+	    p--;
+	}
+    }
+}
+
+enum {
+    LENGTH_MODIFIER_LONG = 0x100
+};
+
+/* Here's a limited reimplementation of printf.  The reason for doing
+ * this is primarily to special case handling of doubles.  We want
+ * locale independent formatting of doubles and we want to trim
+ * trailing zeros.  This is handled by dtostr() above, and the code
+ * below handles everything else by calling snprintf() to do the
+ * formatting.  This functionality is only for internal use and we
+ * only implement the formats we actually use.
+ */
+void
+_cairo_output_stream_vprintf (cairo_output_stream_t *stream,
+			      const char *fmt, va_list ap)
+{
+#define SINGLE_FMT_BUFFER_SIZE 32
+    char buffer[512], single_fmt[SINGLE_FMT_BUFFER_SIZE];
+    int single_fmt_length;
+    char *p;
+    const char *f, *start;
+    int length_modifier, width;
+    cairo_bool_t var_width;
+
+    if (stream->status)
+	return;
+
+    f = fmt;
+    p = buffer;
+    while (*f != '\0') {
+	if (p == buffer + sizeof (buffer)) {
+	    _cairo_output_stream_write (stream, buffer, sizeof (buffer));
+	    p = buffer;
+	}
+
+	if (*f != '%') {
+	    *p++ = *f++;
+	    continue;
+	}
+
+	start = f;
+	f++;
+
+	if (*f == '0')
+	    f++;
+
+        var_width = FALSE;
+        if (*f == '*') {
+            var_width = TRUE;
+	    f++;
+        }
+
+	while (_cairo_isdigit (*f))
+	    f++;
+
+	length_modifier = 0;
+	if (*f == 'l') {
+	    length_modifier = LENGTH_MODIFIER_LONG;
+	    f++;
+	}
+
+	/* The only format strings exist in the cairo implementation
+	 * itself. So there's an internal consistency problem if any
+	 * of them is larger than our format buffer size. */
+	single_fmt_length = f - start + 1;
+	assert (single_fmt_length + 1 <= SINGLE_FMT_BUFFER_SIZE);
+
+	/* Reuse the format string for this conversion. */
+	memcpy (single_fmt, start, single_fmt_length);
+	single_fmt[single_fmt_length] = '\0';
+
+	/* Flush contents of buffer before snprintf()'ing into it. */
+	_cairo_output_stream_write (stream, buffer, p - buffer);
+
+	/* We group signed and unsigned together in this switch, the
+	 * only thing that matters here is the size of the arguments,
+	 * since we're just passing the data through to sprintf(). */
+	switch (*f | length_modifier) {
+	case '%':
+	    buffer[0] = *f;
+	    buffer[1] = 0;
+	    break;
+	case 'd':
+	case 'u':
+	case 'o':
+	case 'x':
+	case 'X':
+            if (var_width) {
+                width = va_arg (ap, int);
+                snprintf (buffer, sizeof buffer,
+                          single_fmt, width, va_arg (ap, int));
+            } else {
+                snprintf (buffer, sizeof buffer, single_fmt, va_arg (ap, int));
+            }
+	    break;
+	case 'd' | LENGTH_MODIFIER_LONG:
+	case 'u' | LENGTH_MODIFIER_LONG:
+	case 'o' | LENGTH_MODIFIER_LONG:
+	case 'x' | LENGTH_MODIFIER_LONG:
+	case 'X' | LENGTH_MODIFIER_LONG:
+            if (var_width) {
+                width = va_arg (ap, int);
+                snprintf (buffer, sizeof buffer,
+                          single_fmt, width, va_arg (ap, long int));
+            } else {
+                snprintf (buffer, sizeof buffer,
+                          single_fmt, va_arg (ap, long int));
+            }
+	    break;
+	case 's': {
+	    /* Write out strings as they may be larger than the buffer. */
+	    const char *s = va_arg (ap, const char *);
+	    int len = strlen(s);
+	    _cairo_output_stream_write (stream, s, len);
+	    buffer[0] = 0;
+	    }
+	    break;
+	case 'f':
+	    _cairo_dtostr (buffer, sizeof buffer, va_arg (ap, double), FALSE);
+	    break;
+	case 'g':
+	    _cairo_dtostr (buffer, sizeof buffer, va_arg (ap, double), TRUE);
+	    break;
+	case 'c':
+	    buffer[0] = va_arg (ap, int);
+	    buffer[1] = 0;
+	    break;
+	default:
+	    ASSERT_NOT_REACHED;
+	}
+	p = buffer + strlen (buffer);
+	f++;
+    }
+
+    _cairo_output_stream_write (stream, buffer, p - buffer);
+}
+
+void
+_cairo_output_stream_printf (cairo_output_stream_t *stream,
+			     const char *fmt, ...)
+{
+    va_list ap;
+
+    va_start (ap, fmt);
+
+    _cairo_output_stream_vprintf (stream, fmt, ap);
+
+    va_end (ap);
+}
+
+/* Matrix elements that are smaller than the value of the largest element * MATRIX_ROUNDING_TOLERANCE
+ * are rounded down to zero. */
+#define MATRIX_ROUNDING_TOLERANCE 1e-12
+
+void
+_cairo_output_stream_print_matrix (cairo_output_stream_t *stream,
+				   const cairo_matrix_t  *matrix)
+{
+    cairo_matrix_t m;
+    double s, e;
+
+    m = *matrix;
+    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);
+
+    e = s * MATRIX_ROUNDING_TOLERANCE;
+    if (fabs(m.xx) < e)
+	m.xx = 0;
+    if (fabs(m.xy) < e)
+	m.xy = 0;
+    if (fabs(m.yx) < e)
+	m.yx = 0;
+    if (fabs(m.yy) < e)
+	m.yy = 0;
+    if (fabs(m.x0) < e)
+	m.x0 = 0;
+    if (fabs(m.y0) < e)
+	m.y0 = 0;
+
+    _cairo_output_stream_printf (stream,
+				 "%f %f %f %f %f %f",
+				 m.xx, m.yx, m.xy, m.yy, m.x0, m.y0);
+}
+
+long
+_cairo_output_stream_get_position (cairo_output_stream_t *stream)
+{
+    return stream->position;
+}
+
+cairo_status_t
+_cairo_output_stream_get_status (cairo_output_stream_t *stream)
+{
+    return stream->status;
+}
+
+/* Maybe this should be a configure time option, so embedded targets
+ * don't have to pull in stdio. */
+
+
+typedef struct _stdio_stream {
+    cairo_output_stream_t	 base;
+    FILE			*file;
+} stdio_stream_t;
+
+static cairo_status_t
+stdio_write (cairo_output_stream_t *base,
+	     const unsigned char *data, unsigned int length)
+{
+    stdio_stream_t *stream = (stdio_stream_t *) base;
+
+    if (fwrite (data, 1, length, stream->file) != length)
+	return _cairo_error (CAIRO_STATUS_WRITE_ERROR);
+
+    return CAIRO_STATUS_SUCCESS;
+}
+
+static cairo_status_t
+stdio_flush (cairo_output_stream_t *base)
+{
+    stdio_stream_t *stream = (stdio_stream_t *) base;
+
+    fflush (stream->file);
+
+    if (ferror (stream->file))
+	return _cairo_error (CAIRO_STATUS_WRITE_ERROR);
+    else
+	return CAIRO_STATUS_SUCCESS;
+}
+
+static cairo_status_t
+stdio_close (cairo_output_stream_t *base)
+{
+    cairo_status_t status;
+    stdio_stream_t *stream = (stdio_stream_t *) base;
+
+    status = stdio_flush (base);
+
+    fclose (stream->file);
+
+    return status;
+}
+
+cairo_output_stream_t *
+_cairo_output_stream_create_for_file (FILE *file)
+{
+    stdio_stream_t *stream;
+
+    if (file == NULL) {
+	_cairo_error_throw (CAIRO_STATUS_WRITE_ERROR);
+	return (cairo_output_stream_t *) &_cairo_output_stream_nil_write_error;
+    }
+
+    stream = _cairo_malloc (sizeof *stream);
+    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,
+			       stdio_write, stdio_flush, stdio_flush);
+    stream->file = file;
+
+    return &stream->base;
+}
+
+cairo_output_stream_t *
+_cairo_output_stream_create_for_filename (const char *filename)
+{
+    stdio_stream_t *stream;
+    FILE *file;
+    cairo_status_t status;
+
+    if (filename == NULL)
+	return _cairo_null_stream_create ();
+
+    status = _cairo_fopen (filename, "wb", &file);
+
+    if (status != CAIRO_STATUS_SUCCESS)
+	return _cairo_output_stream_create_in_error (status);
+
+    if (file == NULL) {
+	switch (errno) {
+	case ENOMEM:
+	    _cairo_error_throw (CAIRO_STATUS_NO_MEMORY);
+	    return (cairo_output_stream_t *) &_cairo_output_stream_nil;
+	default:
+	    _cairo_error_throw (CAIRO_STATUS_WRITE_ERROR);
+	    return (cairo_output_stream_t *) &_cairo_output_stream_nil_write_error;
+	}
+    }
+
+    stream = _cairo_malloc (sizeof *stream);
+    if (unlikely (stream == NULL)) {
+	fclose (file);
+	_cairo_error_throw (CAIRO_STATUS_NO_MEMORY);
+	return (cairo_output_stream_t *) &_cairo_output_stream_nil;
+    }
+
+    _cairo_output_stream_init (&stream->base,
+			       stdio_write, stdio_flush, stdio_close);
+    stream->file = file;
+
+    return &stream->base;
+}
+
+
+typedef struct _memory_stream {
+    cairo_output_stream_t	base;
+    cairo_array_t		array;
+} memory_stream_t;
+
+static cairo_status_t
+memory_write (cairo_output_stream_t *base,
+	      const unsigned char *data, unsigned int length)
+{
+    memory_stream_t *stream = (memory_stream_t *) base;
+
+    return _cairo_array_append_multiple (&stream->array, data, length);
+}
+
+static cairo_status_t
+memory_close (cairo_output_stream_t *base)
+{
+    memory_stream_t *stream = (memory_stream_t *) base;
+
+    _cairo_array_fini (&stream->array);
+
+    return CAIRO_STATUS_SUCCESS;
+}
+
+cairo_output_stream_t *
+_cairo_memory_stream_create (void)
+{
+    memory_stream_t *stream;
+
+    stream = _cairo_malloc (sizeof *stream);
+    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, memory_write, NULL, memory_close);
+    _cairo_array_init (&stream->array, 1);
+
+    return &stream->base;
+}
+
+cairo_status_t
+_cairo_memory_stream_destroy (cairo_output_stream_t *abstract_stream,
+			      unsigned char **data_out,
+			      unsigned long *length_out)
+{
+    memory_stream_t *stream;
+    cairo_status_t status;
+
+    status = abstract_stream->status;
+    if (unlikely (status))
+	return _cairo_output_stream_destroy (abstract_stream);
+
+    stream = (memory_stream_t *) abstract_stream;
+
+    *length_out = _cairo_array_num_elements (&stream->array);
+    *data_out = _cairo_malloc (*length_out);
+    if (unlikely (*data_out == NULL)) {
+	status = _cairo_output_stream_destroy (abstract_stream);
+	assert (status == CAIRO_STATUS_SUCCESS);
+	return _cairo_error (CAIRO_STATUS_NO_MEMORY);
+    }
+    memcpy (*data_out, _cairo_array_index (&stream->array, 0), *length_out);
+
+    return _cairo_output_stream_destroy (abstract_stream);
+}
+
+void
+_cairo_memory_stream_copy (cairo_output_stream_t *base,
+			   cairo_output_stream_t *dest)
+{
+    memory_stream_t *stream = (memory_stream_t *) base;
+
+    if (dest->status)
+	return;
+
+    if (base->status) {
+	dest->status = base->status;
+	return;
+    }
+
+    _cairo_output_stream_write (dest,
+				_cairo_array_index (&stream->array, 0),
+				_cairo_array_num_elements (&stream->array));
+}
+
+int
+_cairo_memory_stream_length (cairo_output_stream_t *base)
+{
+    memory_stream_t *stream = (memory_stream_t *) base;
+
+    return _cairo_array_num_elements (&stream->array);
+}
+
+static cairo_status_t
+null_write (cairo_output_stream_t *base,
+	    const unsigned char *data, unsigned int length)
+{
+    return CAIRO_STATUS_SUCCESS;
+}
+
+cairo_output_stream_t *
+_cairo_null_stream_create (void)
+{
+    cairo_output_stream_t *stream;
+
+    stream = _cairo_malloc (sizeof *stream);
+    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, null_write, NULL, NULL);
+
+    return stream;
+}