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Diffstat (limited to 'Build/source/libs/cairo/cairo-1.12.8/src/cairo-analysis-surface.c')
| -rw-r--r-- | Build/source/libs/cairo/cairo-1.12.8/src/cairo-analysis-surface.c | 934 |
1 files changed, 934 insertions, 0 deletions
diff --git a/Build/source/libs/cairo/cairo-1.12.8/src/cairo-analysis-surface.c b/Build/source/libs/cairo/cairo-1.12.8/src/cairo-analysis-surface.c new file mode 100644 index 00000000000..8516094c200 --- /dev/null +++ b/Build/source/libs/cairo/cairo-1.12.8/src/cairo-analysis-surface.c @@ -0,0 +1,934 @@ +/* + * 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; +} |