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-rw-r--r--libs/cairo/src/cairo-analysis-surface.c893
1 files changed, 893 insertions, 0 deletions
diff --git a/libs/cairo/src/cairo-analysis-surface.c b/libs/cairo/src/cairo-analysis-surface.c
new file mode 100644
index 000000000..2be419994
--- /dev/null
+++ b/libs/cairo/src/cairo-analysis-surface.c
@@ -0,0 +1,893 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "cairoint.h"
+
+#include "cairo-analysis-surface-private.h"
+#include "cairo-error-private.h"
+#include "cairo-paginated-private.h"
+#include "cairo-recording-surface-private.h"
+#include "cairo-surface-subsurface-private.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_status_is_error (status_a));
+ assert (! _cairo_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_STATUS_SUCCESS &&
+ status_b == CAIRO_STATUS_SUCCESS);
+
+ return CAIRO_STATUS_SUCCESS;
+}
+
+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_bool_t old_has_ctm;
+ cairo_matrix_t old_ctm, p2d;
+ cairo_status_t status;
+ cairo_surface_t *source;
+
+ assert (pattern->type == CAIRO_PATTERN_TYPE_SURFACE);
+ surface_pattern = (const cairo_surface_pattern_t *) pattern;
+ assert (surface_pattern->surface->type == CAIRO_SURFACE_TYPE_RECORDING);
+
+ old_ctm = surface->ctm;
+ old_has_ctm = surface->has_ctm;
+
+ p2d = pattern->matrix;
+ status = cairo_matrix_invert (&p2d);
+ assert (status == CAIRO_STATUS_SUCCESS);
+
+ cairo_matrix_multiply (&surface->ctm, &p2d, &surface->ctm);
+ surface->has_ctm = ! _cairo_matrix_is_identity (&surface->ctm);
+
+ source = surface_pattern->surface;
+ if (source->backend->type == CAIRO_SURFACE_TYPE_SUBSURFACE) {
+ cairo_surface_subsurface_t *sub = (cairo_surface_subsurface_t *) source;
+ source = sub->target;
+ }
+
+ status = _cairo_recording_surface_replay_and_create_regions (source, &surface->base);
+
+ surface->ctm = old_ctm;
+ surface->has_ctm = old_has_ctm;
+
+ return 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_STATUS_SUCCESS ||
+ backend_status == CAIRO_INT_STATUS_FLATTEN_TRANSPARENCY)
+ {
+ return CAIRO_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;
+ } 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_STATUS_SUCCESS ||
+ backend_status == CAIRO_INT_STATUS_FLATTEN_TRANSPARENCY)
+ {
+ return CAIRO_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 {
+ if (bbox.p1.x < surface->page_bbox.p1.x)
+ surface->page_bbox.p1.x = bbox.p1.x;
+ if (bbox.p1.y < surface->page_bbox.p1.y)
+ surface->page_bbox.p1.y = bbox.p1.y;
+ if (bbox.p2.x > surface->page_bbox.p2.x)
+ surface->page_bbox.p2.x = bbox.p2.x;
+ if (bbox.p2.y > surface->page_bbox.p2.y)
+ surface->page_bbox.p2.y = bbox.p2.y;
+ }
+
+ /* 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_STATUS_SUCCESS;
+ }
+
+ if (backend_status == CAIRO_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_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, cairo_clip_t *clip)
+{
+ const cairo_rectangle_int_t *clip_extents;
+ cairo_bool_t is_empty;
+
+ clip_extents = NULL;
+ if (clip != NULL)
+ clip_extents = _cairo_clip_get_extents (clip);
+
+ if (clip_extents != NULL)
+ is_empty = _cairo_rectangle_intersect (extents, clip_extents);
+}
+
+static void
+_cairo_analysis_surface_operation_extents (cairo_analysis_surface_t *surface,
+ cairo_operator_t op,
+ const cairo_pattern_t *source,
+ 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);
+ is_empty = _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,
+ cairo_clip_t *clip)
+{
+ cairo_analysis_surface_t *surface = abstract_surface;
+ cairo_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_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,
+ cairo_clip_t *clip)
+{
+ cairo_analysis_surface_t *surface = abstract_surface;
+ cairo_int_status_t backend_status;
+ cairo_rectangle_int_t extents;
+ cairo_bool_t is_empty;
+
+ 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_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) {
+ const cairo_surface_pattern_t *surface_pattern = (const cairo_surface_pattern_t *) source;
+ if (_cairo_surface_is_recording (surface_pattern->surface)) {
+ backend_source_status =
+ _analyze_recording_surface_pattern (surface, source);
+ if (_cairo_status_is_error (backend_source_status))
+ return backend_source_status;
+ }
+ }
+
+ if (mask->type == CAIRO_PATTERN_TYPE_SURFACE) {
+ cairo_surface_pattern_t *surface_pattern = (cairo_surface_pattern_t *) mask;
+ if (_cairo_surface_is_recording (surface_pattern->surface)) {
+ backend_mask_status =
+ _analyze_recording_surface_pattern (surface, mask);
+ if (_cairo_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);
+ is_empty = _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,
+ 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,
+ cairo_clip_t *clip)
+{
+ cairo_analysis_surface_t *surface = abstract_surface;
+ cairo_status_t backend_status;
+ cairo_rectangle_int_t extents;
+ cairo_bool_t is_empty;
+
+ 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_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;
+
+ /* If the backend can handle the stroke, then mark the approximate
+ * extents of the operation. However, if we need to fallback in order
+ * to draw the stroke, then ensure that the fallback is as tight as
+ * possible -- both to minimise output file size and to ensure good
+ * quality printed output for neighbouring regions.
+ */
+ if (backend_status == CAIRO_STATUS_SUCCESS) {
+ _cairo_path_fixed_approximate_stroke_extents (path,
+ style, ctm,
+ &mask_extents);
+ } else {
+ cairo_status_t status;
+
+ status = _cairo_path_fixed_stroke_extents (path, style,
+ ctm, ctm_inverse,
+ tolerance,
+ &mask_extents);
+ if (unlikely (status))
+ return status;
+ }
+
+ is_empty = _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,
+ cairo_path_fixed_t *path,
+ cairo_fill_rule_t fill_rule,
+ double tolerance,
+ cairo_antialias_t antialias,
+ cairo_clip_t *clip)
+{
+ cairo_analysis_surface_t *surface = abstract_surface;
+ cairo_status_t backend_status;
+ cairo_rectangle_int_t extents;
+ cairo_bool_t is_empty;
+
+ 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_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;
+
+ /* We want speed for the likely case where the operation can be
+ * performed natively, but accuracy if we have to resort to
+ * using images.
+ */
+ if (backend_status == CAIRO_STATUS_SUCCESS) {
+ _cairo_path_fixed_approximate_fill_extents (path, &mask_extents);
+ } else {
+ _cairo_path_fixed_fill_extents (path, fill_rule, tolerance,
+ &mask_extents);
+ }
+ is_empty = _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,
+ cairo_clip_t *clip,
+ int *remaining_glyphs)
+{
+ cairo_analysis_surface_t *surface = abstract_surface;
+ cairo_status_t status, backend_status;
+ cairo_rectangle_int_t extents, glyph_extents;
+ cairo_bool_t is_empty;
+
+ /* 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,
+ remaining_glyphs);
+ if (_cairo_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_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;
+
+ is_empty = _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,
+ cairo_clip_t *clip)
+{
+ cairo_analysis_surface_t *surface = abstract_surface;
+ cairo_status_t status, backend_status;
+ cairo_rectangle_int_t extents, glyph_extents;
+ cairo_bool_t is_empty;
+
+ /* 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_status_is_error (backend_status))
+ return backend_status;
+ }
+ if (backend_status == CAIRO_INT_STATUS_UNSUPPORTED &&
+ surface->target->backend->show_glyphs != NULL)
+ {
+ int remaining_glyphs = num_glyphs;
+ backend_status =
+ surface->target->backend->show_glyphs (surface->target, op,
+ source,
+ glyphs, num_glyphs,
+ scaled_font,
+ clip,
+ &remaining_glyphs);
+ if (_cairo_status_is_error (backend_status))
+ return backend_status;
+
+ glyphs += num_glyphs - remaining_glyphs;
+ num_glyphs = remaining_glyphs;
+ if (remaining_glyphs == 0)
+ backend_status = CAIRO_STATUS_SUCCESS;
+ }
+
+ 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;
+
+ is_empty = _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,
+ NULL, /* create_similar */
+ _cairo_analysis_surface_finish,
+ NULL, /* acquire_source_image */
+ NULL, /* release_source_image */
+ NULL, /* acquire_dest_image */
+ NULL, /* release_dest_image */
+ NULL, /* clone_similar */
+ NULL, /* composite */
+ NULL, /* fill_rectangles */
+ NULL, /* composite_trapezoids */
+ NULL, /* create_span_renderer */
+ NULL, /* check_span_renderer */
+ NULL, /* copy_page */
+ NULL, /* show_page */
+ _cairo_analysis_surface_get_extents,
+ NULL, /* old_show_glyphs */
+ NULL, /* get_font_options */
+ NULL, /* flush */
+ NULL, /* mark_dirty_rectangle */
+ NULL, /* scaled_font_fini */
+ NULL, /* scaled_glyph_fini */
+ _cairo_analysis_surface_paint,
+ _cairo_analysis_surface_mask,
+ _cairo_analysis_surface_stroke,
+ _cairo_analysis_surface_fill,
+ _cairo_analysis_surface_show_glyphs,
+ NULL, /* snapshot */
+ NULL, /* is_similar */
+ NULL, /* fill_stroke */
+ NULL, /* create_solid_pattern_surface */
+ NULL, /* can_repaint_solid_pattern_surface */
+ _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,
+ 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,
+ cairo_clip_t *clip);
+
+typedef cairo_int_status_t
+(*_stroke_func) (void *surface,
+ cairo_operator_t op,
+ const cairo_pattern_t *source,
+ 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,
+ cairo_clip_t *clip);
+
+typedef cairo_int_status_t
+(*_fill_func) (void *surface,
+ cairo_operator_t op,
+ const cairo_pattern_t *source,
+ cairo_path_fixed_t *path,
+ cairo_fill_rule_t fill_rule,
+ double tolerance,
+ cairo_antialias_t antialias,
+ 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,
+ cairo_clip_t *clip,
+ int *remaining_glyphs);
+
+static const cairo_surface_backend_t cairo_null_surface_backend = {
+ CAIRO_INTERNAL_SURFACE_TYPE_NULL,
+
+ NULL, /* create_similar */
+ NULL, /* finish */
+ NULL, /* acquire_source_image */
+ NULL, /* release_source_image */
+ NULL, /* acquire_dest_image */
+ NULL, /* release_dest_image */
+ NULL, /* clone_similar */
+ NULL, /* composite */
+ NULL, /* fill_rectangles */
+ NULL, /* composite_trapezoids */
+ NULL, /* create_span_renderer */
+ NULL, /* check_span_renderer */
+ NULL, /* copy_page */
+ NULL, /* show_page */
+ NULL, /* get_extents */
+ NULL, /* old_show_glyphs */
+ NULL, /* get_font_options */
+ NULL, /* flush */
+ NULL, /* mark_dirty_rectangle */
+ NULL, /* scaled_font_fini */
+ NULL, /* scaled_glyph_fini */
+ (_paint_func) _return_success, /* paint */
+ (_mask_func) _return_success, /* mask */
+ (_stroke_func) _return_success, /* stroke */
+ (_fill_func) _return_success, /* fill */
+ (_show_glyphs_func) _return_success, /* show_glyphs */
+ NULL, /* snapshot */
+ NULL, /* is_similar */
+ NULL, /* fill_stroke */
+ NULL, /* create_solid_pattern_surface */
+ NULL, /* can_repaint_solid_pattern_surface */
+ 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;
+}
generated by cgit v1.2.3 (git 2.26.2) at 2024-09-20 18:47:51 +0000