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-rw-r--r--src/cairo-surface-wrapper.c685
1 files changed, 685 insertions, 0 deletions
diff --git a/src/cairo-surface-wrapper.c b/src/cairo-surface-wrapper.c
new file mode 100644
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+++ b/src/cairo-surface-wrapper.c
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+/* 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 (wrapper->has_extents && (wrapper->extents.x || wrapper->extents.y))
+ cairo_matrix_translate (m, -wrapper->extents.x, -wrapper->extents.y);
+
+ 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);
+ }
+
+ if (wrapper->has_extents && (wrapper->extents.x || wrapper->extents.y))
+ cairo_matrix_translate (m, wrapper->extents.x, wrapper->extents.y);
+}
+
+static cairo_clip_t *
+_cairo_surface_wrapper_get_clip (cairo_surface_wrapper_t *wrapper,
+ const cairo_clip_t *clip)
+{
+ cairo_clip_t *copy;
+
+ copy = _cairo_clip_copy (clip);
+ if (wrapper->has_extents) {
+ copy = _cairo_clip_intersect_rectangle (copy, &wrapper->extents);
+ }
+ copy = _cairo_clip_transform (copy, &wrapper->transform);
+ if (! _cairo_matrix_is_identity (&wrapper->target->device_transform))
+ copy = _cairo_clip_transform (copy, &wrapper->target->device_transform);
+ 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_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_rectangle_int_t *extents)
+{
+ cairo_rectangle_int_t clip;
+ cairo_bool_t has_clip;
+
+ 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;
+ }
+}