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-rw-r--r--src/cairo-analysis-surface.c934
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diff --git a/src/cairo-analysis-surface.c b/src/cairo-analysis-surface.c
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+++ b/src/cairo-analysis-surface.c
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+/*
+ * Copyright © 2006 Keith Packard
+ * Copyright © 2007 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 Keith Packard
+ *
+ * Contributor(s):
+ * Keith Packard <keithp@keithp.com>
+ * Adrian Johnson <ajohnson@redneon.com>
+ */
+
+#include "cairoint.h"
+
+#include "cairo-analysis-surface-private.h"
+#include "cairo-box-inline.h"
+#include "cairo-default-context-private.h"
+#include "cairo-error-private.h"
+#include "cairo-paginated-private.h"
+#include "cairo-recording-surface-inline.h"
+#include "cairo-surface-snapshot-inline.h"
+#include "cairo-surface-subsurface-inline.h"
+#include "cairo-region-private.h"
+
+typedef struct {
+ cairo_surface_t base;
+
+ cairo_surface_t *target;
+
+ cairo_bool_t first_op;
+ cairo_bool_t has_supported;
+ cairo_bool_t has_unsupported;
+
+ cairo_region_t supported_region;
+ cairo_region_t fallback_region;
+ cairo_box_t page_bbox;
+
+ cairo_bool_t has_ctm;
+ cairo_matrix_t ctm;
+
+} cairo_analysis_surface_t;
+
+cairo_int_status_t
+_cairo_analysis_surface_merge_status (cairo_int_status_t status_a,
+ cairo_int_status_t status_b)
+{
+ /* fatal errors should be checked and propagated at source */
+ assert (! _cairo_int_status_is_error (status_a));
+ assert (! _cairo_int_status_is_error (status_b));
+
+ /* return the most important status */
+ if (status_a == CAIRO_INT_STATUS_UNSUPPORTED ||
+ status_b == CAIRO_INT_STATUS_UNSUPPORTED)
+ return CAIRO_INT_STATUS_UNSUPPORTED;
+
+ if (status_a == CAIRO_INT_STATUS_IMAGE_FALLBACK ||
+ status_b == CAIRO_INT_STATUS_IMAGE_FALLBACK)
+ return CAIRO_INT_STATUS_IMAGE_FALLBACK;
+
+ if (status_a == CAIRO_INT_STATUS_ANALYZE_RECORDING_SURFACE_PATTERN ||
+ status_b == CAIRO_INT_STATUS_ANALYZE_RECORDING_SURFACE_PATTERN)
+ return CAIRO_INT_STATUS_ANALYZE_RECORDING_SURFACE_PATTERN;
+
+ if (status_a == CAIRO_INT_STATUS_FLATTEN_TRANSPARENCY ||
+ status_b == CAIRO_INT_STATUS_FLATTEN_TRANSPARENCY)
+ return CAIRO_INT_STATUS_FLATTEN_TRANSPARENCY;
+
+ /* at this point we have checked all the valid internal codes, so... */
+ assert (status_a == CAIRO_INT_STATUS_SUCCESS &&
+ status_b == CAIRO_INT_STATUS_SUCCESS);
+
+ return CAIRO_INT_STATUS_SUCCESS;
+}
+
+struct proxy {
+ cairo_surface_t base;
+ cairo_surface_t *target;
+};
+
+static cairo_status_t
+proxy_finish (void *abstract_surface)
+{
+ return CAIRO_STATUS_SUCCESS;
+}
+
+static const cairo_surface_backend_t proxy_backend = {
+ CAIRO_INTERNAL_SURFACE_TYPE_NULL,
+ proxy_finish,
+};
+
+static cairo_surface_t *
+attach_proxy (cairo_surface_t *source,
+ cairo_surface_t *target)
+{
+ struct proxy *proxy;
+
+ proxy = malloc (sizeof (*proxy));
+ if (unlikely (proxy == NULL))
+ return _cairo_surface_create_in_error (CAIRO_STATUS_NO_MEMORY);
+
+ _cairo_surface_init (&proxy->base, &proxy_backend, NULL, target->content);
+
+ proxy->target = target;
+ _cairo_surface_attach_snapshot (source, &proxy->base, NULL);
+
+ return &proxy->base;
+}
+
+static void
+detach_proxy (cairo_surface_t *proxy)
+{
+ cairo_surface_finish (proxy);
+ cairo_surface_destroy (proxy);
+}
+
+static cairo_int_status_t
+_analyze_recording_surface_pattern (cairo_analysis_surface_t *surface,
+ const cairo_pattern_t *pattern)
+{
+ const cairo_surface_pattern_t *surface_pattern;
+ cairo_analysis_surface_t *tmp;
+ cairo_surface_t *source, *proxy;
+ cairo_matrix_t p2d;
+ cairo_status_t status, analysis_status;
+
+ assert (pattern->type == CAIRO_PATTERN_TYPE_SURFACE);
+ surface_pattern = (const cairo_surface_pattern_t *) pattern;
+ assert (surface_pattern->surface->type == CAIRO_SURFACE_TYPE_RECORDING);
+ source = surface_pattern->surface;
+
+ proxy = _cairo_surface_has_snapshot (source, &proxy_backend);
+ if (proxy != NULL) {
+ /* nothing untoward found so far */
+ return CAIRO_STATUS_SUCCESS;
+ }
+
+ tmp = (cairo_analysis_surface_t *)
+ _cairo_analysis_surface_create (surface->target);
+ if (unlikely (tmp->base.status))
+ return tmp->base.status;
+ proxy = attach_proxy (source, &tmp->base);
+
+ p2d = pattern->matrix;
+ status = cairo_matrix_invert (&p2d);
+ assert (status == CAIRO_STATUS_SUCCESS);
+
+ cairo_matrix_multiply (&tmp->ctm, &p2d, &surface->ctm);
+ tmp->has_ctm = ! _cairo_matrix_is_identity (&tmp->ctm);
+
+ source = _cairo_surface_get_source (source, NULL);
+ status = _cairo_recording_surface_replay_and_create_regions (source,
+ &tmp->base);
+ analysis_status = tmp->has_unsupported ? CAIRO_INT_STATUS_IMAGE_FALLBACK : CAIRO_INT_STATUS_SUCCESS;
+ detach_proxy (proxy);
+ cairo_surface_destroy (&tmp->base);
+
+ if (unlikely (status))
+ return status;
+
+ return analysis_status;
+}
+
+static cairo_int_status_t
+_add_operation (cairo_analysis_surface_t *surface,
+ cairo_rectangle_int_t *rect,
+ cairo_int_status_t backend_status)
+{
+ cairo_int_status_t status;
+ cairo_box_t bbox;
+
+ if (rect->width == 0 || rect->height == 0) {
+ /* Even though the operation is not visible we must be careful
+ * to not allow unsupported operations to be replayed to the
+ * backend during CAIRO_PAGINATED_MODE_RENDER */
+ if (backend_status == CAIRO_INT_STATUS_SUCCESS ||
+ backend_status == CAIRO_INT_STATUS_FLATTEN_TRANSPARENCY ||
+ backend_status == CAIRO_INT_STATUS_NOTHING_TO_DO)
+ {
+ return CAIRO_INT_STATUS_SUCCESS;
+ }
+ else
+ {
+ return CAIRO_INT_STATUS_IMAGE_FALLBACK;
+ }
+ }
+
+ _cairo_box_from_rectangle (&bbox, rect);
+
+ if (surface->has_ctm) {
+ int tx, ty;
+
+ if (_cairo_matrix_is_integer_translation (&surface->ctm, &tx, &ty)) {
+ rect->x += tx;
+ rect->y += ty;
+
+ tx = _cairo_fixed_from_int (tx);
+ bbox.p1.x += tx;
+ bbox.p2.x += tx;
+
+ ty = _cairo_fixed_from_int (ty);
+ bbox.p1.y += ty;
+ bbox.p2.y += ty;
+ } else {
+ _cairo_matrix_transform_bounding_box_fixed (&surface->ctm,
+ &bbox, NULL);
+
+ if (bbox.p1.x == bbox.p2.x || bbox.p1.y == bbox.p2.y) {
+ /* Even though the operation is not visible we must be
+ * careful to not allow unsupported operations to be
+ * replayed to the backend during
+ * CAIRO_PAGINATED_MODE_RENDER */
+ if (backend_status == CAIRO_INT_STATUS_SUCCESS ||
+ backend_status == CAIRO_INT_STATUS_FLATTEN_TRANSPARENCY ||
+ backend_status == CAIRO_INT_STATUS_NOTHING_TO_DO)
+ {
+ return CAIRO_INT_STATUS_SUCCESS;
+ }
+ else
+ {
+ return CAIRO_INT_STATUS_IMAGE_FALLBACK;
+ }
+ }
+
+ _cairo_box_round_to_rectangle (&bbox, rect);
+ }
+ }
+
+ if (surface->first_op) {
+ surface->first_op = FALSE;
+ surface->page_bbox = bbox;
+ } else
+ _cairo_box_add_box(&surface->page_bbox, &bbox);
+
+ /* If the operation is completely enclosed within the fallback
+ * region there is no benefit in emitting a native operation as
+ * the fallback image will be painted on top.
+ */
+ if (cairo_region_contains_rectangle (&surface->fallback_region, rect) == CAIRO_REGION_OVERLAP_IN)
+ return CAIRO_INT_STATUS_IMAGE_FALLBACK;
+
+ if (backend_status == CAIRO_INT_STATUS_FLATTEN_TRANSPARENCY) {
+ /* A status of CAIRO_INT_STATUS_FLATTEN_TRANSPARENCY indicates
+ * that the backend only supports this operation if the
+ * transparency removed. If the extents of this operation does
+ * not intersect any other native operation, the operation is
+ * natively supported and the backend will blend the
+ * transparency into the white background.
+ */
+ if (cairo_region_contains_rectangle (&surface->supported_region, rect) == CAIRO_REGION_OVERLAP_OUT)
+ backend_status = CAIRO_INT_STATUS_SUCCESS;
+ }
+
+ if (backend_status == CAIRO_INT_STATUS_SUCCESS) {
+ /* Add the operation to the supported region. Operations in
+ * this region will be emitted as native operations.
+ */
+ surface->has_supported = TRUE;
+ return cairo_region_union_rectangle (&surface->supported_region, rect);
+ }
+
+ /* Add the operation to the unsupported region. This region will
+ * be painted as an image after all native operations have been
+ * emitted.
+ */
+ surface->has_unsupported = TRUE;
+ status = cairo_region_union_rectangle (&surface->fallback_region, rect);
+
+ /* The status CAIRO_INT_STATUS_IMAGE_FALLBACK is used to indicate
+ * unsupported operations to the recording surface as using
+ * CAIRO_INT_STATUS_UNSUPPORTED would cause cairo-surface to
+ * invoke the cairo-surface-fallback path then return
+ * CAIRO_STATUS_SUCCESS.
+ */
+ if (status == CAIRO_INT_STATUS_SUCCESS)
+ return CAIRO_INT_STATUS_IMAGE_FALLBACK;
+ else
+ return status;
+}
+
+static cairo_status_t
+_cairo_analysis_surface_finish (void *abstract_surface)
+{
+ cairo_analysis_surface_t *surface = (cairo_analysis_surface_t *) abstract_surface;
+
+ _cairo_region_fini (&surface->supported_region);
+ _cairo_region_fini (&surface->fallback_region);
+
+ cairo_surface_destroy (surface->target);
+
+ return CAIRO_STATUS_SUCCESS;
+}
+
+static cairo_bool_t
+_cairo_analysis_surface_get_extents (void *abstract_surface,
+ cairo_rectangle_int_t *rectangle)
+{
+ cairo_analysis_surface_t *surface = abstract_surface;
+
+ return _cairo_surface_get_extents (surface->target, rectangle);
+}
+
+static void
+_rectangle_intersect_clip (cairo_rectangle_int_t *extents, const cairo_clip_t *clip)
+{
+ if (clip != NULL)
+ _cairo_rectangle_intersect (extents, _cairo_clip_get_extents (clip));
+}
+
+static void
+_cairo_analysis_surface_operation_extents (cairo_analysis_surface_t *surface,
+ cairo_operator_t op,
+ const cairo_pattern_t *source,
+ const cairo_clip_t *clip,
+ cairo_rectangle_int_t *extents)
+{
+ cairo_bool_t is_empty;
+
+ is_empty = _cairo_surface_get_extents (&surface->base, extents);
+
+ if (_cairo_operator_bounded_by_source (op)) {
+ cairo_rectangle_int_t source_extents;
+
+ _cairo_pattern_get_extents (source, &source_extents);
+ _cairo_rectangle_intersect (extents, &source_extents);
+ }
+
+ _rectangle_intersect_clip (extents, clip);
+}
+
+static cairo_int_status_t
+_cairo_analysis_surface_paint (void *abstract_surface,
+ cairo_operator_t op,
+ const cairo_pattern_t *source,
+ const cairo_clip_t *clip)
+{
+ cairo_analysis_surface_t *surface = abstract_surface;
+ cairo_int_status_t backend_status;
+ cairo_rectangle_int_t extents;
+
+ if (surface->target->backend->paint == NULL) {
+ backend_status = CAIRO_INT_STATUS_UNSUPPORTED;
+ } else {
+ backend_status =
+ surface->target->backend->paint (surface->target,
+ op, source, clip);
+ if (_cairo_int_status_is_error (backend_status))
+ return backend_status;
+ }
+
+ if (backend_status == CAIRO_INT_STATUS_ANALYZE_RECORDING_SURFACE_PATTERN)
+ backend_status = _analyze_recording_surface_pattern (surface, source);
+
+ _cairo_analysis_surface_operation_extents (surface,
+ op, source, clip,
+ &extents);
+
+ return _add_operation (surface, &extents, backend_status);
+}
+
+static cairo_int_status_t
+_cairo_analysis_surface_mask (void *abstract_surface,
+ cairo_operator_t op,
+ const cairo_pattern_t *source,
+ const cairo_pattern_t *mask,
+ const cairo_clip_t *clip)
+{
+ cairo_analysis_surface_t *surface = abstract_surface;
+ cairo_int_status_t backend_status;
+ cairo_rectangle_int_t extents;
+
+ if (surface->target->backend->mask == NULL) {
+ backend_status = CAIRO_INT_STATUS_UNSUPPORTED;
+ } else {
+ backend_status =
+ surface->target->backend->mask (surface->target,
+ op, source, mask, clip);
+ if (_cairo_int_status_is_error (backend_status))
+ return backend_status;
+ }
+
+ if (backend_status == CAIRO_INT_STATUS_ANALYZE_RECORDING_SURFACE_PATTERN) {
+ cairo_int_status_t backend_source_status = CAIRO_STATUS_SUCCESS;
+ cairo_int_status_t backend_mask_status = CAIRO_STATUS_SUCCESS;
+
+ if (source->type == CAIRO_PATTERN_TYPE_SURFACE) {
+ cairo_surface_t *src_surface = ((cairo_surface_pattern_t *)source)->surface;
+ src_surface = _cairo_surface_get_source (src_surface, NULL);
+ if (_cairo_surface_is_recording (src_surface)) {
+ backend_source_status =
+ _analyze_recording_surface_pattern (surface, source);
+ if (_cairo_int_status_is_error (backend_source_status))
+ return backend_source_status;
+ }
+ }
+
+ if (mask->type == CAIRO_PATTERN_TYPE_SURFACE) {
+ cairo_surface_t *mask_surface = ((cairo_surface_pattern_t *)mask)->surface;
+ mask_surface = _cairo_surface_get_source (mask_surface, NULL);
+ if (_cairo_surface_is_recording (mask_surface)) {
+ backend_mask_status =
+ _analyze_recording_surface_pattern (surface, mask);
+ if (_cairo_int_status_is_error (backend_mask_status))
+ return backend_mask_status;
+ }
+ }
+
+ backend_status =
+ _cairo_analysis_surface_merge_status (backend_source_status,
+ backend_mask_status);
+ }
+
+ _cairo_analysis_surface_operation_extents (surface,
+ op, source, clip,
+ &extents);
+
+ if (_cairo_operator_bounded_by_mask (op)) {
+ cairo_rectangle_int_t mask_extents;
+
+ _cairo_pattern_get_extents (mask, &mask_extents);
+ _cairo_rectangle_intersect (&extents, &mask_extents);
+ }
+
+ return _add_operation (surface, &extents, backend_status);
+}
+
+static cairo_int_status_t
+_cairo_analysis_surface_stroke (void *abstract_surface,
+ cairo_operator_t op,
+ const cairo_pattern_t *source,
+ const cairo_path_fixed_t *path,
+ const cairo_stroke_style_t *style,
+ const cairo_matrix_t *ctm,
+ const cairo_matrix_t *ctm_inverse,
+ double tolerance,
+ cairo_antialias_t antialias,
+ const cairo_clip_t *clip)
+{
+ cairo_analysis_surface_t *surface = abstract_surface;
+ cairo_int_status_t backend_status;
+ cairo_rectangle_int_t extents;
+
+ if (surface->target->backend->stroke == NULL) {
+ backend_status = CAIRO_INT_STATUS_UNSUPPORTED;
+ } else {
+ backend_status =
+ surface->target->backend->stroke (surface->target, op,
+ source, path, style,
+ ctm, ctm_inverse,
+ tolerance, antialias,
+ clip);
+ if (_cairo_int_status_is_error (backend_status))
+ return backend_status;
+ }
+
+ if (backend_status == CAIRO_INT_STATUS_ANALYZE_RECORDING_SURFACE_PATTERN)
+ backend_status = _analyze_recording_surface_pattern (surface, source);
+
+ _cairo_analysis_surface_operation_extents (surface,
+ op, source, clip,
+ &extents);
+
+ if (_cairo_operator_bounded_by_mask (op)) {
+ cairo_rectangle_int_t mask_extents;
+ cairo_int_status_t status;
+
+ status = _cairo_path_fixed_stroke_extents (path, style,
+ ctm, ctm_inverse,
+ tolerance,
+ &mask_extents);
+ if (unlikely (status))
+ return status;
+
+ _cairo_rectangle_intersect (&extents, &mask_extents);
+ }
+
+ return _add_operation (surface, &extents, backend_status);
+}
+
+static cairo_int_status_t
+_cairo_analysis_surface_fill (void *abstract_surface,
+ 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_analysis_surface_t *surface = abstract_surface;
+ cairo_int_status_t backend_status;
+ cairo_rectangle_int_t extents;
+
+ if (surface->target->backend->fill == NULL) {
+ backend_status = CAIRO_INT_STATUS_UNSUPPORTED;
+ } else {
+ backend_status =
+ surface->target->backend->fill (surface->target, op,
+ source, path, fill_rule,
+ tolerance, antialias,
+ clip);
+ if (_cairo_int_status_is_error (backend_status))
+ return backend_status;
+ }
+
+ if (backend_status == CAIRO_INT_STATUS_ANALYZE_RECORDING_SURFACE_PATTERN)
+ backend_status = _analyze_recording_surface_pattern (surface, source);
+
+ _cairo_analysis_surface_operation_extents (surface,
+ op, source, clip,
+ &extents);
+
+ if (_cairo_operator_bounded_by_mask (op)) {
+ cairo_rectangle_int_t mask_extents;
+
+ _cairo_path_fixed_fill_extents (path, fill_rule, tolerance,
+ &mask_extents);
+
+ _cairo_rectangle_intersect (&extents, &mask_extents);
+ }
+
+ return _add_operation (surface, &extents, backend_status);
+}
+
+static cairo_int_status_t
+_cairo_analysis_surface_show_glyphs (void *abstract_surface,
+ cairo_operator_t op,
+ const cairo_pattern_t *source,
+ cairo_glyph_t *glyphs,
+ int num_glyphs,
+ cairo_scaled_font_t *scaled_font,
+ const cairo_clip_t *clip)
+{
+ cairo_analysis_surface_t *surface = abstract_surface;
+ cairo_int_status_t status, backend_status;
+ cairo_rectangle_int_t extents, glyph_extents;
+
+ /* Adapted from _cairo_surface_show_glyphs */
+ if (surface->target->backend->show_glyphs != NULL) {
+ backend_status =
+ surface->target->backend->show_glyphs (surface->target, op,
+ source,
+ glyphs, num_glyphs,
+ scaled_font,
+ clip);
+ if (_cairo_int_status_is_error (backend_status))
+ return backend_status;
+ }
+ else if (surface->target->backend->show_text_glyphs != NULL)
+ {
+ backend_status =
+ surface->target->backend->show_text_glyphs (surface->target, op,
+ source,
+ NULL, 0,
+ glyphs, num_glyphs,
+ NULL, 0,
+ FALSE,
+ scaled_font,
+ clip);
+ if (_cairo_int_status_is_error (backend_status))
+ return backend_status;
+ }
+ else
+ {
+ backend_status = CAIRO_INT_STATUS_UNSUPPORTED;
+ }
+
+ if (backend_status == CAIRO_INT_STATUS_ANALYZE_RECORDING_SURFACE_PATTERN)
+ backend_status = _analyze_recording_surface_pattern (surface, source);
+
+ _cairo_analysis_surface_operation_extents (surface,
+ op, source, clip,
+ &extents);
+
+ if (_cairo_operator_bounded_by_mask (op)) {
+ status = _cairo_scaled_font_glyph_device_extents (scaled_font,
+ glyphs,
+ num_glyphs,
+ &glyph_extents,
+ NULL);
+ if (unlikely (status))
+ return status;
+
+ _cairo_rectangle_intersect (&extents, &glyph_extents);
+ }
+
+ return _add_operation (surface, &extents, backend_status);
+}
+
+static cairo_bool_t
+_cairo_analysis_surface_has_show_text_glyphs (void *abstract_surface)
+{
+ cairo_analysis_surface_t *surface = abstract_surface;
+
+ return cairo_surface_has_show_text_glyphs (surface->target);
+}
+
+static cairo_int_status_t
+_cairo_analysis_surface_show_text_glyphs (void *abstract_surface,
+ cairo_operator_t op,
+ const cairo_pattern_t *source,
+ const char *utf8,
+ int utf8_len,
+ 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_analysis_surface_t *surface = abstract_surface;
+ cairo_int_status_t status, backend_status;
+ cairo_rectangle_int_t extents, glyph_extents;
+
+ /* Adapted from _cairo_surface_show_glyphs */
+ backend_status = CAIRO_INT_STATUS_UNSUPPORTED;
+ if (surface->target->backend->show_text_glyphs != NULL) {
+ backend_status =
+ surface->target->backend->show_text_glyphs (surface->target, op,
+ source,
+ utf8, utf8_len,
+ glyphs, num_glyphs,
+ clusters, num_clusters,
+ cluster_flags,
+ scaled_font,
+ clip);
+ if (_cairo_int_status_is_error (backend_status))
+ return backend_status;
+ }
+ if (backend_status == CAIRO_INT_STATUS_UNSUPPORTED &&
+ surface->target->backend->show_glyphs != NULL)
+ {
+ backend_status =
+ surface->target->backend->show_glyphs (surface->target, op,
+ source,
+ glyphs, num_glyphs,
+ scaled_font,
+ clip);
+ if (_cairo_int_status_is_error (backend_status))
+ return backend_status;
+ }
+
+ if (backend_status == CAIRO_INT_STATUS_ANALYZE_RECORDING_SURFACE_PATTERN)
+ backend_status = _analyze_recording_surface_pattern (surface, source);
+
+ _cairo_analysis_surface_operation_extents (surface,
+ op, source, clip,
+ &extents);
+
+ if (_cairo_operator_bounded_by_mask (op)) {
+ status = _cairo_scaled_font_glyph_device_extents (scaled_font,
+ glyphs,
+ num_glyphs,
+ &glyph_extents,
+ NULL);
+ if (unlikely (status))
+ return status;
+
+ _cairo_rectangle_intersect (&extents, &glyph_extents);
+ }
+
+ return _add_operation (surface, &extents, backend_status);
+}
+
+static const cairo_surface_backend_t cairo_analysis_surface_backend = {
+ CAIRO_INTERNAL_SURFACE_TYPE_ANALYSIS,
+
+ _cairo_analysis_surface_finish,
+ NULL,
+
+ NULL, /* create_similar */
+ NULL, /* create_similar_image */
+ NULL, /* map_to_image */
+ NULL, /* unmap */
+
+ NULL, /* source */
+ NULL, /* acquire_source_image */
+ NULL, /* release_source_image */
+ NULL, /* snapshot */
+
+ NULL, /* copy_page */
+ NULL, /* show_page */
+
+ _cairo_analysis_surface_get_extents,
+ NULL, /* get_font_options */
+
+ NULL, /* flush */
+ NULL, /* mark_dirty_rectangle */
+
+ _cairo_analysis_surface_paint,
+ _cairo_analysis_surface_mask,
+ _cairo_analysis_surface_stroke,
+ _cairo_analysis_surface_fill,
+ NULL, /* fill_stroke */
+ _cairo_analysis_surface_show_glyphs,
+ _cairo_analysis_surface_has_show_text_glyphs,
+ _cairo_analysis_surface_show_text_glyphs
+};
+
+cairo_surface_t *
+_cairo_analysis_surface_create (cairo_surface_t *target)
+{
+ cairo_analysis_surface_t *surface;
+ cairo_status_t status;
+
+ status = target->status;
+ if (unlikely (status))
+ return _cairo_surface_create_in_error (status);
+
+ surface = malloc (sizeof (cairo_analysis_surface_t));
+ if (unlikely (surface == NULL))
+ return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_NO_MEMORY));
+
+ /* I believe the content type here is truly arbitrary. I'm quite
+ * sure nothing will ever use this value. */
+ _cairo_surface_init (&surface->base,
+ &cairo_analysis_surface_backend,
+ NULL, /* device */
+ CAIRO_CONTENT_COLOR_ALPHA);
+
+ cairo_matrix_init_identity (&surface->ctm);
+ surface->has_ctm = FALSE;
+
+ surface->target = cairo_surface_reference (target);
+ surface->first_op = TRUE;
+ surface->has_supported = FALSE;
+ surface->has_unsupported = FALSE;
+
+ _cairo_region_init (&surface->supported_region);
+ _cairo_region_init (&surface->fallback_region);
+
+ surface->page_bbox.p1.x = 0;
+ surface->page_bbox.p1.y = 0;
+ surface->page_bbox.p2.x = 0;
+ surface->page_bbox.p2.y = 0;
+
+ return &surface->base;
+}
+
+void
+_cairo_analysis_surface_set_ctm (cairo_surface_t *abstract_surface,
+ const cairo_matrix_t *ctm)
+{
+ cairo_analysis_surface_t *surface;
+
+ if (abstract_surface->status)
+ return;
+
+ surface = (cairo_analysis_surface_t *) abstract_surface;
+
+ surface->ctm = *ctm;
+ surface->has_ctm = ! _cairo_matrix_is_identity (&surface->ctm);
+}
+
+void
+_cairo_analysis_surface_get_ctm (cairo_surface_t *abstract_surface,
+ cairo_matrix_t *ctm)
+{
+ cairo_analysis_surface_t *surface = (cairo_analysis_surface_t *) abstract_surface;
+
+ *ctm = surface->ctm;
+}
+
+
+cairo_region_t *
+_cairo_analysis_surface_get_supported (cairo_surface_t *abstract_surface)
+{
+ cairo_analysis_surface_t *surface = (cairo_analysis_surface_t *) abstract_surface;
+
+ return &surface->supported_region;
+}
+
+cairo_region_t *
+_cairo_analysis_surface_get_unsupported (cairo_surface_t *abstract_surface)
+{
+ cairo_analysis_surface_t *surface = (cairo_analysis_surface_t *) abstract_surface;
+
+ return &surface->fallback_region;
+}
+
+cairo_bool_t
+_cairo_analysis_surface_has_supported (cairo_surface_t *abstract_surface)
+{
+ cairo_analysis_surface_t *surface = (cairo_analysis_surface_t *) abstract_surface;
+
+ return surface->has_supported;
+}
+
+cairo_bool_t
+_cairo_analysis_surface_has_unsupported (cairo_surface_t *abstract_surface)
+{
+ cairo_analysis_surface_t *surface = (cairo_analysis_surface_t *) abstract_surface;
+
+ return surface->has_unsupported;
+}
+
+void
+_cairo_analysis_surface_get_bounding_box (cairo_surface_t *abstract_surface,
+ cairo_box_t *bbox)
+{
+ cairo_analysis_surface_t *surface = (cairo_analysis_surface_t *) abstract_surface;
+
+ *bbox = surface->page_bbox;
+}
+
+/* null surface type: a surface that does nothing (has no side effects, yay!) */
+
+static cairo_int_status_t
+_return_success (void)
+{
+ return CAIRO_STATUS_SUCCESS;
+}
+
+/* These typedefs are just to silence the compiler... */
+typedef cairo_int_status_t
+(*_paint_func) (void *surface,
+ cairo_operator_t op,
+ const cairo_pattern_t *source,
+ const cairo_clip_t *clip);
+
+typedef cairo_int_status_t
+(*_mask_func) (void *surface,
+ cairo_operator_t op,
+ const cairo_pattern_t *source,
+ const cairo_pattern_t *mask,
+ const cairo_clip_t *clip);
+
+typedef cairo_int_status_t
+(*_stroke_func) (void *surface,
+ cairo_operator_t op,
+ const cairo_pattern_t *source,
+ const cairo_path_fixed_t *path,
+ const cairo_stroke_style_t *style,
+ const cairo_matrix_t *ctm,
+ const cairo_matrix_t *ctm_inverse,
+ double tolerance,
+ cairo_antialias_t antialias,
+ const cairo_clip_t *clip);
+
+typedef cairo_int_status_t
+(*_fill_func) (void *surface,
+ 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);
+
+typedef cairo_int_status_t
+(*_show_glyphs_func) (void *surface,
+ cairo_operator_t op,
+ const cairo_pattern_t *source,
+ cairo_glyph_t *glyphs,
+ int num_glyphs,
+ cairo_scaled_font_t *scaled_font,
+ const cairo_clip_t *clip);
+
+static const cairo_surface_backend_t cairo_null_surface_backend = {
+ CAIRO_INTERNAL_SURFACE_TYPE_NULL,
+ NULL, /* finish */
+
+ NULL, /* only accessed through the surface functions */
+
+ NULL, /* create_similar */
+ NULL, /* create similar image */
+ NULL, /* map to image */
+ NULL, /* unmap image*/
+
+ NULL, /* source */
+ NULL, /* acquire_source_image */
+ NULL, /* release_source_image */
+ NULL, /* snapshot */
+
+ NULL, /* copy_page */
+ NULL, /* show_page */
+
+ NULL, /* get_extents */
+ NULL, /* get_font_options */
+
+ NULL, /* flush */
+ NULL, /* mark_dirty_rectangle */
+
+ (_paint_func) _return_success, /* paint */
+ (_mask_func) _return_success, /* mask */
+ (_stroke_func) _return_success, /* stroke */
+ (_fill_func) _return_success, /* fill */
+ NULL, /* fill_stroke */
+ (_show_glyphs_func) _return_success, /* show_glyphs */
+ NULL, /* has_show_text_glyphs */
+ NULL /* show_text_glyphs */
+};
+
+cairo_surface_t *
+_cairo_null_surface_create (cairo_content_t content)
+{
+ cairo_surface_t *surface;
+
+ surface = malloc (sizeof (cairo_surface_t));
+ if (unlikely (surface == NULL)) {
+ return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_NO_MEMORY));
+ }
+
+ _cairo_surface_init (surface,
+ &cairo_null_surface_backend,
+ NULL, /* device */
+ content);
+
+ return surface;
+}