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dc083ab30a
When observing applications two patterns emerge. The first is due to Pango, which wraps each glyph run within a context save/restore. This causes the scaled font to be evicted after every run and reloaded on the next. This is caught by the MRU slot on the cairo_scaled_font_map and prevents a relatively costly traversal of the hash table and holdovers. The second pattern is by applications that directly manage the rendering of their own glyphs. The prime example of this is gnome-terminal/vte. Here the application frequently alternates between a few scaled fonts - which requires a hash table retrieval every time. By introducing a MRU slot on the gstate we are able to directly recover the scaled font around 90% of the time. Of 110,000 set-scaled-fonts: 4,000 were setting the current font 96,000 were setting to the previous font 2,500 were recovered from the MRU on the cairo_scaled_font_map 7,500 needed a hash retrieval which compares to ~106,000 hash lookups without the additional MRU slot on the gstate. This translates to an elapsed time saving of ~5% when replaying a gnome-terminal trace using the drm backend.
72 lines
2.5 KiB
C
72 lines
2.5 KiB
C
/* cairo - a vector graphics library with display and print output
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*
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* Copyright © 2005 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it either under the terms of the GNU Lesser General Public
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* License version 2.1 as published by the Free Software Foundation
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* (the "LGPL") or, at your option, under the terms of the Mozilla
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* Public License Version 1.1 (the "MPL"). If you do not alter this
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* notice, a recipient may use your version of this file under either
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* the MPL or the LGPL.
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*
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* You should have received a copy of the LGPL along with this library
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* in the file COPYING-LGPL-2.1; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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* You should have received a copy of the MPL along with this library
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* in the file COPYING-MPL-1.1
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*
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* The contents of this file are subject to the Mozilla Public License
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* Version 1.1 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
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* OF ANY KIND, either express or implied. See the LGPL or the MPL for
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* the specific language governing rights and limitations.
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*
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* The Original Code is the cairo graphics library.
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*
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* The Initial Developer of the Original Code is Red Hat, Inc.
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*
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* Contributor(s):
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* Carl D. Worth <cworth@redhat.com>
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*/
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#ifndef CAIRO_GSTATE_PRIVATE_H
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#define CAIRO_GSTATE_PRIVATE_H
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#include "cairo-clip-private.h"
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struct _cairo_gstate {
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cairo_operator_t op;
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double tolerance;
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cairo_antialias_t antialias;
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cairo_stroke_style_t stroke_style;
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cairo_fill_rule_t fill_rule;
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cairo_font_face_t *font_face;
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cairo_scaled_font_t *scaled_font; /* Specific to the current CTM */
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cairo_scaled_font_t *previous_scaled_font; /* holdover */
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cairo_matrix_t font_matrix;
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cairo_font_options_t font_options;
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cairo_clip_t clip;
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cairo_surface_t *target; /* The target to which all rendering is directed */
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cairo_surface_t *parent_target; /* The previous target which was receiving rendering */
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cairo_surface_t *original_target; /* The original target the initial gstate was created with */
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cairo_matrix_t ctm;
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cairo_matrix_t ctm_inverse;
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cairo_matrix_t source_ctm_inverse; /* At the time ->source was set */
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cairo_pattern_t *source;
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struct _cairo_gstate *next;
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};
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#endif /* CAIRO_GSTATE_PRIVATE_H */
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