add cairo

1 files changed, 729 insertions, 0 deletions

diff --git a/libs/cairo-1.16.0/src/cairo-surface-wrapper.c b/libs/cairo-1.16.0/src/cairo-surface-wrapper.c
new file mode 100644
index 0000000..47155c3
--- /dev/null
+++ b/libs/cairo-1.16.0/src/cairo-surface-wrapper.c
@@ -0,0 +1,729 @@
+/* cairo - a vector graphics library with display and print output
+ *
+ * Copyright © 2005 Red Hat, Inc
+ * Copyright © 2007 Adrian Johnson
+ * Copyright © 2009 Chris Wilson
+ *
+ * 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.
+ *
+ * Contributor(s):
+ *      Chris Wilson <chris@chris-wilson.co.uk>
+ */
+
+#include "cairoint.h"
+
+#include "cairo-clip-inline.h"
+#include "cairo-error-private.h"
+#include "cairo-pattern-private.h"
+#include "cairo-surface-wrapper-private.h"
+
+/* A collection of routines to facilitate surface wrapping */
+
+static void
+_copy_transformed_pattern (cairo_pattern_t *pattern,
+			   const cairo_pattern_t *original,
+			   const cairo_matrix_t  *ctm_inverse)
+{
+    _cairo_pattern_init_static_copy (pattern, original);
+
+    if (! _cairo_matrix_is_identity (ctm_inverse))
+	_cairo_pattern_transform (pattern, ctm_inverse);
+}
+
+cairo_status_t
+_cairo_surface_wrapper_acquire_source_image (cairo_surface_wrapper_t *wrapper,
+					     cairo_image_surface_t  **image_out,
+					     void                   **image_extra)
+{
+    if (unlikely (wrapper->target->status))
+	return wrapper->target->status;
+
+    return _cairo_surface_acquire_source_image (wrapper->target,
+						image_out, image_extra);
+}
+
+void
+_cairo_surface_wrapper_release_source_image (cairo_surface_wrapper_t *wrapper,
+					     cairo_image_surface_t  *image,
+					     void                   *image_extra)
+{
+    _cairo_surface_release_source_image (wrapper->target, image, image_extra);
+}
+
+static void
+_cairo_surface_wrapper_get_transform (cairo_surface_wrapper_t *wrapper,
+				      cairo_matrix_t *m)
+{
+    cairo_matrix_init_identity (m);
+
+    if (! _cairo_matrix_is_identity (&wrapper->transform))
+	cairo_matrix_multiply (m, &wrapper->transform, m);
+
+    if (! _cairo_matrix_is_identity (&wrapper->target->device_transform))
+	cairo_matrix_multiply (m, &wrapper->target->device_transform, m);
+}
+
+static void
+_cairo_surface_wrapper_get_inverse_transform (cairo_surface_wrapper_t *wrapper,
+					      cairo_matrix_t *m)
+{
+    cairo_matrix_init_identity (m);
+
+    if (! _cairo_matrix_is_identity (&wrapper->target->device_transform_inverse))
+	cairo_matrix_multiply (m, &wrapper->target->device_transform_inverse, m);
+
+    if (! _cairo_matrix_is_identity (&wrapper->transform)) {
+	cairo_matrix_t inv;
+	cairo_status_t status;
+
+	inv = wrapper->transform;
+	status = cairo_matrix_invert (&inv);
+	assert (status == CAIRO_STATUS_SUCCESS);
+	cairo_matrix_multiply (m, &inv, m);
+    }
+}
+
+static cairo_clip_t *
+_cairo_surface_wrapper_get_clip (cairo_surface_wrapper_t *wrapper,
+				 const cairo_clip_t *clip)
+{
+    cairo_clip_t *copy;
+    cairo_matrix_t m;
+
+    copy = _cairo_clip_copy (clip);
+    if (wrapper->has_extents) {
+	copy = _cairo_clip_intersect_rectangle (copy, &wrapper->extents);
+    }
+    _cairo_surface_wrapper_get_transform (wrapper, &m);
+    copy = _cairo_clip_transform (copy, &m);
+    if (wrapper->clip)
+	copy = _cairo_clip_intersect_clip (copy, wrapper->clip);
+
+    return copy;
+}
+
+cairo_status_t
+_cairo_surface_wrapper_paint (cairo_surface_wrapper_t *wrapper,
+			      cairo_operator_t	 op,
+			      const cairo_pattern_t *source,
+			      const cairo_clip_t    *clip)
+{
+    cairo_status_t status;
+    cairo_clip_t *dev_clip;
+    cairo_pattern_union_t source_copy;
+
+    if (unlikely (wrapper->target->status))
+	return wrapper->target->status;
+
+    dev_clip = _cairo_surface_wrapper_get_clip (wrapper, clip);
+    if (_cairo_clip_is_all_clipped (dev_clip))
+	return CAIRO_INT_STATUS_NOTHING_TO_DO;
+
+    if (wrapper->needs_transform) {
+	cairo_matrix_t m;
+
+	_cairo_surface_wrapper_get_transform (wrapper, &m);
+
+	status = cairo_matrix_invert (&m);
+	assert (status == CAIRO_STATUS_SUCCESS);
+
+	_copy_transformed_pattern (&source_copy.base, source, &m);
+	source = &source_copy.base;
+    }
+
+    status = _cairo_surface_paint (wrapper->target, op, source, dev_clip);
+
+    _cairo_clip_destroy (dev_clip);
+    return status;
+}
+
+
+cairo_status_t
+_cairo_surface_wrapper_mask (cairo_surface_wrapper_t *wrapper,
+			     cairo_operator_t	 op,
+			     const cairo_pattern_t *source,
+			     const cairo_pattern_t *mask,
+			     const cairo_clip_t	    *clip)
+{
+    cairo_status_t status;
+    cairo_clip_t *dev_clip;
+    cairo_pattern_union_t source_copy;
+    cairo_pattern_union_t mask_copy;
+
+    if (unlikely (wrapper->target->status))
+	return wrapper->target->status;
+
+    dev_clip = _cairo_surface_wrapper_get_clip (wrapper, clip);
+    if (_cairo_clip_is_all_clipped (dev_clip))
+	return CAIRO_INT_STATUS_NOTHING_TO_DO;
+
+    if (wrapper->needs_transform) {
+	cairo_matrix_t m;
+
+	_cairo_surface_wrapper_get_transform (wrapper, &m);
+
+	status = cairo_matrix_invert (&m);
+	assert (status == CAIRO_STATUS_SUCCESS);
+
+	_copy_transformed_pattern (&source_copy.base, source, &m);
+	source = &source_copy.base;
+
+	_copy_transformed_pattern (&mask_copy.base, mask, &m);
+	mask = &mask_copy.base;
+    }
+
+    status = _cairo_surface_mask (wrapper->target, op, source, mask, dev_clip);
+
+    _cairo_clip_destroy (dev_clip);
+    return status;
+}
+
+cairo_status_t
+_cairo_surface_wrapper_stroke (cairo_surface_wrapper_t *wrapper,
+			       cairo_operator_t		 op,
+			       const cairo_pattern_t	*source,
+			       const cairo_path_fixed_t	*path,
+			       const cairo_stroke_style_t	*stroke_style,
+			       const cairo_matrix_t		*ctm,
+			       const cairo_matrix_t		*ctm_inverse,
+			       double			 tolerance,
+			       cairo_antialias_t	 antialias,
+			       const cairo_clip_t		*clip)
+{
+    cairo_status_t status;
+    cairo_path_fixed_t path_copy, *dev_path = (cairo_path_fixed_t *) path;
+    cairo_clip_t *dev_clip;
+    cairo_matrix_t dev_ctm = *ctm;
+    cairo_matrix_t dev_ctm_inverse = *ctm_inverse;
+    cairo_pattern_union_t source_copy;
+
+    if (unlikely (wrapper->target->status))
+	return wrapper->target->status;
+
+    dev_clip = _cairo_surface_wrapper_get_clip (wrapper, clip);
+    if (_cairo_clip_is_all_clipped (dev_clip))
+	return CAIRO_INT_STATUS_NOTHING_TO_DO;
+
+    if (wrapper->needs_transform) {
+	cairo_matrix_t m;
+
+	_cairo_surface_wrapper_get_transform (wrapper, &m);
+
+	status = _cairo_path_fixed_init_copy (&path_copy, dev_path);
+	if (unlikely (status))
+	    goto FINISH;
+
+	_cairo_path_fixed_transform (&path_copy, &m);
+	dev_path = &path_copy;
+
+	cairo_matrix_multiply (&dev_ctm, &dev_ctm, &m);
+
+	status = cairo_matrix_invert (&m);
+	assert (status == CAIRO_STATUS_SUCCESS);
+
+	cairo_matrix_multiply (&dev_ctm_inverse, &m, &dev_ctm_inverse);
+
+	_copy_transformed_pattern (&source_copy.base, source, &m);
+	source = &source_copy.base;
+    }
+
+    status = _cairo_surface_stroke (wrapper->target, op, source,
+				    dev_path, stroke_style,
+				    &dev_ctm, &dev_ctm_inverse,
+				    tolerance, antialias,
+				    dev_clip);
+
+ FINISH:
+    if (dev_path != path)
+	_cairo_path_fixed_fini (dev_path);
+    _cairo_clip_destroy (dev_clip);
+    return status;
+}
+
+cairo_status_t
+_cairo_surface_wrapper_fill_stroke (cairo_surface_wrapper_t *wrapper,
+				    cairo_operator_t	     fill_op,
+				    const cairo_pattern_t   *fill_source,
+				    cairo_fill_rule_t	     fill_rule,
+				    double		     fill_tolerance,
+				    cairo_antialias_t	     fill_antialias,
+				    const cairo_path_fixed_t*path,
+				    cairo_operator_t	     stroke_op,
+				    const cairo_pattern_t   *stroke_source,
+				    const cairo_stroke_style_t    *stroke_style,
+				    const cairo_matrix_t	    *stroke_ctm,
+				    const cairo_matrix_t	    *stroke_ctm_inverse,
+				    double		     stroke_tolerance,
+				    cairo_antialias_t	     stroke_antialias,
+				    const cairo_clip_t	    *clip)
+{
+    cairo_status_t status;
+    cairo_path_fixed_t path_copy, *dev_path = (cairo_path_fixed_t *)path;
+    cairo_matrix_t dev_ctm = *stroke_ctm;
+    cairo_matrix_t dev_ctm_inverse = *stroke_ctm_inverse;
+    cairo_clip_t *dev_clip;
+    cairo_pattern_union_t stroke_source_copy;
+    cairo_pattern_union_t fill_source_copy;
+
+    if (unlikely (wrapper->target->status))
+	return wrapper->target->status;
+
+    dev_clip = _cairo_surface_wrapper_get_clip (wrapper, clip);
+    if (_cairo_clip_is_all_clipped (dev_clip))
+	return CAIRO_INT_STATUS_NOTHING_TO_DO;
+
+    if (wrapper->needs_transform) {
+	cairo_matrix_t m;
+
+	_cairo_surface_wrapper_get_transform (wrapper, &m);
+
+	status = _cairo_path_fixed_init_copy (&path_copy, dev_path);
+	if (unlikely (status))
+	    goto FINISH;
+
+	_cairo_path_fixed_transform (&path_copy, &m);
+	dev_path = &path_copy;
+
+	cairo_matrix_multiply (&dev_ctm, &dev_ctm, &m);
+
+	status = cairo_matrix_invert (&m);
+	assert (status == CAIRO_STATUS_SUCCESS);
+
+	cairo_matrix_multiply (&dev_ctm_inverse, &m, &dev_ctm_inverse);
+
+	_copy_transformed_pattern (&stroke_source_copy.base, stroke_source, &m);
+	stroke_source = &stroke_source_copy.base;
+
+	_copy_transformed_pattern (&fill_source_copy.base, fill_source, &m);
+	fill_source = &fill_source_copy.base;
+    }
+
+    status = _cairo_surface_fill_stroke (wrapper->target,
+					 fill_op, fill_source, fill_rule,
+					 fill_tolerance, fill_antialias,
+					 dev_path,
+					 stroke_op, stroke_source,
+					 stroke_style,
+					 &dev_ctm, &dev_ctm_inverse,
+					 stroke_tolerance, stroke_antialias,
+					 dev_clip);
+
+  FINISH:
+    if (dev_path != path)
+	_cairo_path_fixed_fini (dev_path);
+    _cairo_clip_destroy (dev_clip);
+    return status;
+}
+
+cairo_status_t
+_cairo_surface_wrapper_fill (cairo_surface_wrapper_t	*wrapper,
+			     cairo_operator_t	 op,
+			     const cairo_pattern_t *source,
+			     const cairo_path_fixed_t	*path,
+			     cairo_fill_rule_t	 fill_rule,
+			     double		 tolerance,
+			     cairo_antialias_t	 antialias,
+			     const cairo_clip_t	*clip)
+{
+    cairo_status_t status;
+    cairo_path_fixed_t path_copy, *dev_path = (cairo_path_fixed_t *) path;
+    cairo_pattern_union_t source_copy;
+    cairo_clip_t *dev_clip;
+
+    if (unlikely (wrapper->target->status))
+	return wrapper->target->status;
+
+    dev_clip = _cairo_surface_wrapper_get_clip (wrapper, clip);
+    if (_cairo_clip_is_all_clipped (dev_clip))
+	return CAIRO_INT_STATUS_NOTHING_TO_DO;
+
+    if (wrapper->needs_transform) {
+	cairo_matrix_t m;
+
+	_cairo_surface_wrapper_get_transform (wrapper, &m);
+
+	status = _cairo_path_fixed_init_copy (&path_copy, dev_path);
+	if (unlikely (status))
+	    goto FINISH;
+
+	_cairo_path_fixed_transform (&path_copy, &m);
+	dev_path = &path_copy;
+
+	status = cairo_matrix_invert (&m);
+	assert (status == CAIRO_STATUS_SUCCESS);
+
+	_copy_transformed_pattern (&source_copy.base, source, &m);
+	source = &source_copy.base;
+    }
+
+    status = _cairo_surface_fill (wrapper->target, op, source,
+				  dev_path, fill_rule,
+				  tolerance, antialias,
+				  dev_clip);
+
+ FINISH:
+    if (dev_path != path)
+	_cairo_path_fixed_fini (dev_path);
+    _cairo_clip_destroy (dev_clip);
+    return status;
+}
+
+cairo_status_t
+_cairo_surface_wrapper_show_text_glyphs (cairo_surface_wrapper_t *wrapper,
+					 cairo_operator_t	     op,
+					 const cairo_pattern_t	    *source,
+					 const char		    *utf8,
+					 int			     utf8_len,
+					 const cairo_glyph_t	    *glyphs,
+					 int			     num_glyphs,
+					 const cairo_text_cluster_t *clusters,
+					 int			     num_clusters,
+					 cairo_text_cluster_flags_t  cluster_flags,
+					 cairo_scaled_font_t	    *scaled_font,
+					 const cairo_clip_t	    *clip)
+{
+    cairo_status_t status;
+    cairo_clip_t *dev_clip;
+    cairo_glyph_t stack_glyphs [CAIRO_STACK_ARRAY_LENGTH(cairo_glyph_t)];
+    cairo_glyph_t *dev_glyphs = stack_glyphs;
+    cairo_scaled_font_t *dev_scaled_font = scaled_font;
+    cairo_pattern_union_t source_copy;
+    cairo_font_options_t options;
+
+    if (unlikely (wrapper->target->status))
+	return wrapper->target->status;
+
+    dev_clip = _cairo_surface_wrapper_get_clip (wrapper, clip);
+    if (_cairo_clip_is_all_clipped (dev_clip))
+	return CAIRO_INT_STATUS_NOTHING_TO_DO;
+
+    cairo_surface_get_font_options (wrapper->target, &options);
+    cairo_font_options_merge (&options, &scaled_font->options);
+
+    if (wrapper->needs_transform) {
+	cairo_matrix_t m;
+	int i;
+
+	_cairo_surface_wrapper_get_transform (wrapper, &m);
+
+	if (! _cairo_matrix_is_translation (&m)) {
+	    cairo_matrix_t ctm;
+
+	    _cairo_matrix_multiply (&ctm,
+				    &m,
+				    &scaled_font->ctm);
+	    dev_scaled_font = cairo_scaled_font_create (scaled_font->font_face,
+							&scaled_font->font_matrix,
+							&ctm, &options);
+	}
+
+	if (num_glyphs > ARRAY_LENGTH (stack_glyphs)) {
+	    dev_glyphs = _cairo_malloc_ab (num_glyphs, sizeof (cairo_glyph_t));
+	    if (unlikely (dev_glyphs == NULL)) {
+		status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
+		goto FINISH;
+	    }
+	}
+
+	for (i = 0; i < num_glyphs; i++) {
+	    dev_glyphs[i] = glyphs[i];
+	    cairo_matrix_transform_point (&m,
+					  &dev_glyphs[i].x,
+					  &dev_glyphs[i].y);
+	}
+
+	status = cairo_matrix_invert (&m);
+	assert (status == CAIRO_STATUS_SUCCESS);
+
+	_copy_transformed_pattern (&source_copy.base, source, &m);
+	source = &source_copy.base;
+    } else {
+	if (! cairo_font_options_equal (&options, &scaled_font->options)) {
+	    dev_scaled_font = cairo_scaled_font_create (scaled_font->font_face,
+							&scaled_font->font_matrix,
+							&scaled_font->ctm,
+							&options);
+	}
+
+	/* show_text_glyphs is special because _cairo_surface_show_text_glyphs is allowed
+	 * to modify the glyph array that's passed in.  We must always
+	 * copy the array before handing it to the backend.
+	 */
+	if (num_glyphs > ARRAY_LENGTH (stack_glyphs)) {
+	    dev_glyphs = _cairo_malloc_ab (num_glyphs, sizeof (cairo_glyph_t));
+	    if (unlikely (dev_glyphs == NULL)) {
+		status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
+		goto FINISH;
+	    }
+	}
+
+	memcpy (dev_glyphs, glyphs, sizeof (cairo_glyph_t) * num_glyphs);
+    }
+
+    status = _cairo_surface_show_text_glyphs (wrapper->target, op, source,
+					      utf8, utf8_len,
+					      dev_glyphs, num_glyphs,
+					      clusters, num_clusters,
+					      cluster_flags,
+					      dev_scaled_font,
+					      dev_clip);
+ FINISH:
+    _cairo_clip_destroy (dev_clip);
+    if (dev_glyphs != stack_glyphs)
+	free (dev_glyphs);
+    if (dev_scaled_font != scaled_font)
+	cairo_scaled_font_destroy (dev_scaled_font);
+    return status;
+}
+
+cairo_status_t
+_cairo_surface_wrapper_tag (cairo_surface_wrapper_t     *wrapper,
+			    cairo_bool_t                 begin,
+			    const char                  *tag_name,
+			    const char                  *attributes,
+			    const cairo_pattern_t	*source,
+			    const cairo_stroke_style_t	*stroke_style,
+			    const cairo_matrix_t	*ctm,
+			    const cairo_matrix_t	*ctm_inverse,
+			    const cairo_clip_t		*clip)
+{
+    cairo_status_t status;
+    cairo_clip_t *dev_clip;
+    cairo_matrix_t dev_ctm = *ctm;
+    cairo_matrix_t dev_ctm_inverse = *ctm_inverse;
+    cairo_pattern_union_t source_copy;
+
+    if (unlikely (wrapper->target->status))
+	return wrapper->target->status;
+
+    dev_clip = _cairo_surface_wrapper_get_clip (wrapper, clip);
+    if (wrapper->needs_transform) {
+	cairo_matrix_t m;
+
+	_cairo_surface_wrapper_get_transform (wrapper, &m);
+
+	cairo_matrix_multiply (&dev_ctm, &dev_ctm, &m);
+
+	status = cairo_matrix_invert (&m);
+	assert (status == CAIRO_STATUS_SUCCESS);
+
+	cairo_matrix_multiply (&dev_ctm_inverse, &m, &dev_ctm_inverse);
+
+	_copy_transformed_pattern (&source_copy.base, source, &m);
+	source = &source_copy.base;
+    }
+
+    status = _cairo_surface_tag (wrapper->target,
+				 begin, tag_name, attributes,
+				 source, stroke_style,
+				 &dev_ctm, &dev_ctm_inverse,
+				 dev_clip);
+
+    _cairo_clip_destroy (dev_clip);
+    return status;
+}
+
+cairo_surface_t *
+_cairo_surface_wrapper_create_similar (cairo_surface_wrapper_t *wrapper,
+				       cairo_content_t	content,
+				       int		width,
+				       int		height)
+{
+    return _cairo_surface_create_scratch (wrapper->target,
+					  content, width, height, NULL);
+}
+
+cairo_bool_t
+_cairo_surface_wrapper_get_extents (cairo_surface_wrapper_t *wrapper,
+				    cairo_rectangle_int_t   *extents)
+{
+    if (wrapper->has_extents) {
+	if (_cairo_surface_get_extents (wrapper->target, extents))
+	    _cairo_rectangle_intersect (extents, &wrapper->extents);
+	else
+	    *extents = wrapper->extents;
+
+	return TRUE;
+    } else {
+	return _cairo_surface_get_extents (wrapper->target, extents);
+    }
+}
+
+static cairo_bool_t
+_cairo_surface_wrapper_needs_device_transform (cairo_surface_wrapper_t *wrapper)
+{
+    return
+	(wrapper->has_extents && (wrapper->extents.x | wrapper->extents.y)) ||
+	! _cairo_matrix_is_identity (&wrapper->transform) ||
+	! _cairo_matrix_is_identity (&wrapper->target->device_transform);
+}
+
+void
+_cairo_surface_wrapper_intersect_extents (cairo_surface_wrapper_t *wrapper,
+					  const cairo_rectangle_int_t *extents)
+{
+    if (! wrapper->has_extents) {
+	wrapper->extents = *extents;
+	wrapper->has_extents = TRUE;
+    } else
+	_cairo_rectangle_intersect (&wrapper->extents, extents);
+
+    wrapper->needs_transform =
+	_cairo_surface_wrapper_needs_device_transform (wrapper);
+}
+
+void
+_cairo_surface_wrapper_set_inverse_transform (cairo_surface_wrapper_t *wrapper,
+					      const cairo_matrix_t *transform)
+{
+    cairo_status_t status;
+
+    if (transform == NULL || _cairo_matrix_is_identity (transform)) {
+	cairo_matrix_init_identity (&wrapper->transform);
+
+	wrapper->needs_transform =
+	    _cairo_surface_wrapper_needs_device_transform (wrapper);
+    } else {
+	wrapper->transform = *transform;
+	status = cairo_matrix_invert (&wrapper->transform);
+	/* should always be invertible unless given pathological input */
+	assert (status == CAIRO_STATUS_SUCCESS);
+
+	wrapper->needs_transform = TRUE;
+    }
+}
+
+void
+_cairo_surface_wrapper_set_clip (cairo_surface_wrapper_t *wrapper,
+				 const cairo_clip_t *clip)
+{
+    wrapper->clip = clip;
+}
+
+void
+_cairo_surface_wrapper_get_font_options (cairo_surface_wrapper_t    *wrapper,
+					 cairo_font_options_t	    *options)
+{
+    cairo_surface_get_font_options (wrapper->target, options);
+}
+
+cairo_surface_t *
+_cairo_surface_wrapper_snapshot (cairo_surface_wrapper_t *wrapper)
+{
+    if (wrapper->target->backend->snapshot)
+	return wrapper->target->backend->snapshot (wrapper->target);
+
+    return NULL;
+}
+
+cairo_bool_t
+_cairo_surface_wrapper_has_show_text_glyphs (cairo_surface_wrapper_t *wrapper)
+{
+    return cairo_surface_has_show_text_glyphs (wrapper->target);
+}
+
+void
+_cairo_surface_wrapper_init (cairo_surface_wrapper_t *wrapper,
+			     cairo_surface_t *target)
+{
+    wrapper->target = cairo_surface_reference (target);
+    cairo_matrix_init_identity (&wrapper->transform);
+    wrapper->has_extents = FALSE;
+    wrapper->extents.x = wrapper->extents.y = 0;
+    wrapper->clip = NULL;
+
+    wrapper->needs_transform = FALSE;
+    if (target) {
+	wrapper->needs_transform =
+	    ! _cairo_matrix_is_identity (&target->device_transform);
+    }
+}
+
+void
+_cairo_surface_wrapper_fini (cairo_surface_wrapper_t *wrapper)
+{
+    cairo_surface_destroy (wrapper->target);
+}
+
+cairo_bool_t
+_cairo_surface_wrapper_get_target_extents (cairo_surface_wrapper_t *wrapper,
+					   cairo_bool_t surface_is_unbounded,
+					   cairo_rectangle_int_t *extents)
+{
+    cairo_rectangle_int_t clip;
+    cairo_bool_t has_clip = FALSE;
+
+    if (!surface_is_unbounded)
+	has_clip = _cairo_surface_get_extents (wrapper->target, &clip);
+
+    if (wrapper->clip) {
+	if (has_clip) {
+	    if (! _cairo_rectangle_intersect (&clip,
+					      _cairo_clip_get_extents (wrapper->clip)))
+		return FALSE;
+	} else {
+	    has_clip = TRUE;
+	    clip = *_cairo_clip_get_extents (wrapper->clip);
+	}
+    }
+
+    if (has_clip && wrapper->needs_transform) {
+	cairo_matrix_t m;
+	double x1, y1, x2, y2;
+
+	_cairo_surface_wrapper_get_inverse_transform (wrapper, &m);
+
+	x1 = clip.x;
+	y1 = clip.y;
+	x2 = clip.x + clip.width;
+	y2 = clip.y + clip.height;
+
+	_cairo_matrix_transform_bounding_box (&m, &x1, &y1, &x2, &y2, NULL);
+
+	clip.x = floor (x1);
+	clip.y = floor (y1);
+	clip.width  = ceil (x2) - clip.x;
+	clip.height = ceil (y2) - clip.y;
+    }
+
+    if (has_clip) {
+	if (wrapper->has_extents) {
+	    *extents = wrapper->extents;
+	    return _cairo_rectangle_intersect (extents, &clip);
+	} else {
+	    *extents = clip;
+	    return TRUE;
+	}
+    } else if (wrapper->has_extents) {
+	*extents = wrapper->extents;
+	return TRUE;
+    } else {
+	_cairo_unbounded_rectangle_init (extents);
+	return TRUE;
+    }
+}