548 lines
12 KiB
C++
548 lines
12 KiB
C++
/*
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* Copyright (C) 2009 Red Hat, Inc.
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Red Hat Author(s): Behdad Esfahbod
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*/
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#include "hb-private.h"
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#include "hb-font-private.h"
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#include "hb-blob-private.h"
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#include "hb-open-file-private.hh"
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#include "hb-ot-layout-private.hh"
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#include <string.h>
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HB_BEGIN_DECLS
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/*
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* hb_font_funcs_t
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*/
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static hb_codepoint_t
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hb_font_get_glyph_nil (hb_font_t *font HB_UNUSED,
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hb_face_t *face HB_UNUSED,
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const void *user_data HB_UNUSED,
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hb_codepoint_t unicode HB_UNUSED,
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hb_codepoint_t variation_selector HB_UNUSED)
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{ return 0; }
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static hb_bool_t
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hb_font_get_contour_point_nil (hb_font_t *font HB_UNUSED,
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hb_face_t *face HB_UNUSED,
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const void *user_data HB_UNUSED,
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unsigned int point_index HB_UNUSED,
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hb_codepoint_t glyph HB_UNUSED,
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hb_position_t *x HB_UNUSED,
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hb_position_t *y HB_UNUSED)
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{ return false; }
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static void
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hb_font_get_glyph_metrics_nil (hb_font_t *font HB_UNUSED,
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hb_face_t *face HB_UNUSED,
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const void *user_data HB_UNUSED,
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hb_codepoint_t glyph HB_UNUSED,
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hb_glyph_metrics_t *metrics HB_UNUSED)
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{ }
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static hb_position_t
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hb_font_get_kerning_nil (hb_font_t *font HB_UNUSED,
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hb_face_t *face HB_UNUSED,
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const void *user_data HB_UNUSED,
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hb_codepoint_t first_glyph HB_UNUSED,
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hb_codepoint_t second_glyph HB_UNUSED)
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{ return 0; }
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hb_font_funcs_t _hb_font_funcs_nil = {
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HB_REFERENCE_COUNT_INVALID, /* ref_count */
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TRUE, /* immutable */
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{
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hb_font_get_glyph_nil,
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hb_font_get_contour_point_nil,
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hb_font_get_glyph_metrics_nil,
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hb_font_get_kerning_nil
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}
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};
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hb_font_funcs_t *
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hb_font_funcs_create (void)
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{
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hb_font_funcs_t *ffuncs;
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if (!HB_OBJECT_DO_CREATE (hb_font_funcs_t, ffuncs))
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return &_hb_font_funcs_nil;
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ffuncs->v = _hb_font_funcs_nil.v;
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return ffuncs;
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}
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hb_font_funcs_t *
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hb_font_funcs_reference (hb_font_funcs_t *ffuncs)
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{
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HB_OBJECT_DO_REFERENCE (ffuncs);
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}
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unsigned int
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hb_font_funcs_get_reference_count (hb_font_funcs_t *ffuncs)
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{
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HB_OBJECT_DO_GET_REFERENCE_COUNT (ffuncs);
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}
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void
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hb_font_funcs_destroy (hb_font_funcs_t *ffuncs)
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{
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HB_OBJECT_DO_DESTROY (ffuncs);
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free (ffuncs);
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}
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hb_font_funcs_t *
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hb_font_funcs_copy (hb_font_funcs_t *other_ffuncs)
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{
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hb_font_funcs_t *ffuncs;
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if (!HB_OBJECT_DO_CREATE (hb_font_funcs_t, ffuncs))
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return &_hb_font_funcs_nil;
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ffuncs->v = other_ffuncs->v;
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return ffuncs;
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}
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void
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hb_font_funcs_make_immutable (hb_font_funcs_t *ffuncs)
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{
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if (HB_OBJECT_IS_INERT (ffuncs))
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return;
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ffuncs->immutable = TRUE;
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}
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hb_bool_t
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hb_font_funcs_is_immutable (hb_font_funcs_t *ffuncs)
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{
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return ffuncs->immutable;
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}
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void
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hb_font_funcs_set_glyph_func (hb_font_funcs_t *ffuncs,
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hb_font_get_glyph_func_t glyph_func)
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{
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if (ffuncs->immutable)
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return;
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ffuncs->v.get_glyph = glyph_func ? glyph_func : hb_font_get_glyph_nil;
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}
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void
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hb_font_funcs_set_contour_point_func (hb_font_funcs_t *ffuncs,
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hb_font_get_contour_point_func_t contour_point_func)
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{
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if (ffuncs->immutable)
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return;
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ffuncs->v.get_contour_point = contour_point_func ? contour_point_func : hb_font_get_contour_point_nil;
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}
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void
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hb_font_funcs_set_glyph_metrics_func (hb_font_funcs_t *ffuncs,
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hb_font_get_glyph_metrics_func_t glyph_metrics_func)
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{
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if (ffuncs->immutable)
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return;
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ffuncs->v.get_glyph_metrics = glyph_metrics_func ? glyph_metrics_func : hb_font_get_glyph_metrics_nil;
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}
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void
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hb_font_funcs_set_kerning_func (hb_font_funcs_t *ffuncs,
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hb_font_get_kerning_func_t kerning_func)
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{
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if (ffuncs->immutable)
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return;
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ffuncs->v.get_kerning = kerning_func ? kerning_func : hb_font_get_kerning_nil;
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}
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hb_font_get_glyph_func_t
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hb_font_funcs_get_glyph_func (hb_font_funcs_t *ffuncs)
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{
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return ffuncs->v.get_glyph;
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}
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hb_font_get_contour_point_func_t
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hb_font_funcs_get_contour_point_func (hb_font_funcs_t *ffuncs)
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{
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return ffuncs->v.get_contour_point;
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}
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hb_font_get_glyph_metrics_func_t
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hb_font_funcs_get_glyph_metrics_func (hb_font_funcs_t *ffuncs)
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{
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return ffuncs->v.get_glyph_metrics;
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}
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hb_font_get_kerning_func_t
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hb_font_funcs_get_kerning_func (hb_font_funcs_t *ffuncs)
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{
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return ffuncs->v.get_kerning;
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}
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hb_codepoint_t
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hb_font_get_glyph (hb_font_t *font, hb_face_t *face,
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hb_codepoint_t unicode, hb_codepoint_t variation_selector)
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{
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return font->klass->v.get_glyph (font, face, font->user_data,
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unicode, variation_selector);
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}
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hb_bool_t
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hb_font_get_contour_point (hb_font_t *font, hb_face_t *face,
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unsigned int point_index,
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hb_codepoint_t glyph, hb_position_t *x, hb_position_t *y)
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{
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*x = 0; *y = 0;
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return font->klass->v.get_contour_point (font, face, font->user_data,
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point_index,
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glyph, x, y);
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}
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void
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hb_font_get_glyph_metrics (hb_font_t *font, hb_face_t *face,
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hb_codepoint_t glyph, hb_glyph_metrics_t *metrics)
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{
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memset (metrics, 0, sizeof (*metrics));
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return font->klass->v.get_glyph_metrics (font, face, font->user_data,
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glyph, metrics);
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}
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hb_position_t
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hb_font_get_kerning (hb_font_t *font, hb_face_t *face,
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hb_codepoint_t first_glyph, hb_codepoint_t second_glyph)
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{
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return font->klass->v.get_kerning (font, face, font->user_data,
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first_glyph, second_glyph);
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}
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/*
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* hb_face_t
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*/
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static hb_face_t _hb_face_nil = {
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HB_REFERENCE_COUNT_INVALID, /* ref_count */
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NULL, /* get_table */
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NULL, /* destroy */
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NULL, /* user_data */
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NULL, /* head_blob */
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NULL, /* head_table */
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NULL /* ot_layout */
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};
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hb_face_t *
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hb_face_create_for_tables (hb_get_table_func_t get_table,
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hb_destroy_func_t destroy,
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void *user_data)
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{
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hb_face_t *face;
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if (!HB_OBJECT_DO_CREATE (hb_face_t, face)) {
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if (destroy)
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destroy (user_data);
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return &_hb_face_nil;
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}
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face->get_table = get_table;
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face->destroy = destroy;
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face->user_data = user_data;
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face->ot_layout = _hb_ot_layout_new (face);
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face->head_blob = Sanitizer<head>::sanitize (hb_face_get_table (face, HB_OT_TAG_head));
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face->head_table = Sanitizer<head>::lock_instance (face->head_blob);
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return face;
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}
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typedef struct _hb_face_for_data_closure_t {
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hb_blob_t *blob;
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unsigned int index;
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} hb_face_for_data_closure_t;
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static hb_face_for_data_closure_t *
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_hb_face_for_data_closure_create (hb_blob_t *blob, unsigned int index)
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{
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hb_face_for_data_closure_t *closure;
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closure = (hb_face_for_data_closure_t *) malloc (sizeof (hb_face_for_data_closure_t));
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if (unlikely (!closure))
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return NULL;
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closure->blob = blob;
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closure->index = index;
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return closure;
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}
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static void
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_hb_face_for_data_closure_destroy (hb_face_for_data_closure_t *closure)
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{
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hb_blob_destroy (closure->blob);
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free (closure);
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}
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static hb_blob_t *
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_hb_face_for_data_get_table (hb_tag_t tag, void *user_data)
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{
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hb_face_for_data_closure_t *data = (hb_face_for_data_closure_t *) user_data;
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const OpenTypeFontFile &ot_file = *Sanitizer<OpenTypeFontFile>::lock_instance (data->blob);
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const OpenTypeFontFace &ot_face = ot_file.get_face (data->index);
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const OpenTypeTable &table = ot_face.get_table_by_tag (tag);
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hb_blob_t *blob = hb_blob_create_sub_blob (data->blob, table.offset, table.length);
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hb_blob_unlock (data->blob);
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return blob;
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}
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hb_face_t *
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hb_face_create_for_data (hb_blob_t *blob,
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unsigned int index)
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{
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hb_face_for_data_closure_t *closure = _hb_face_for_data_closure_create (Sanitizer<OpenTypeFontFile>::sanitize (hb_blob_reference (blob)), index);
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if (unlikely (!closure))
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return &_hb_face_nil;
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return hb_face_create_for_tables (_hb_face_for_data_get_table,
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(hb_destroy_func_t) _hb_face_for_data_closure_destroy,
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closure);
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}
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hb_face_t *
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hb_face_reference (hb_face_t *face)
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{
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HB_OBJECT_DO_REFERENCE (face);
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}
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unsigned int
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hb_face_get_reference_count (hb_face_t *face)
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{
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HB_OBJECT_DO_GET_REFERENCE_COUNT (face);
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}
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void
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hb_face_destroy (hb_face_t *face)
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{
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HB_OBJECT_DO_DESTROY (face);
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_hb_ot_layout_free (face->ot_layout);
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hb_blob_unlock (face->head_blob);
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hb_blob_destroy (face->head_blob);
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if (face->destroy)
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face->destroy (face->user_data);
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free (face);
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}
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hb_blob_t *
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hb_face_get_table (hb_face_t *face,
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hb_tag_t tag)
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{
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hb_blob_t *blob;
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if (unlikely (!face || !face->get_table))
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return &_hb_blob_nil;
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blob = face->get_table (tag, face->user_data);
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return blob;
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}
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unsigned int
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hb_face_get_upem (hb_face_t *face)
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{
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return (face->head_table ? face->head_table : &Null(head))->get_upem ();
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}
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/*
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* hb_font_t
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*/
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static hb_font_t _hb_font_nil = {
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HB_REFERENCE_COUNT_INVALID, /* ref_count */
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0, /* x_scale */
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0, /* y_scale */
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0, /* x_ppem */
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0, /* y_ppem */
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NULL, /* klass */
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NULL, /* destroy */
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NULL /* user_data */
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};
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hb_font_t *
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hb_font_create (void)
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{
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hb_font_t *font;
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if (!HB_OBJECT_DO_CREATE (hb_font_t, font))
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return &_hb_font_nil;
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font->klass = &_hb_font_funcs_nil;
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return font;
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}
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hb_font_t *
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hb_font_reference (hb_font_t *font)
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{
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HB_OBJECT_DO_REFERENCE (font);
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}
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unsigned int
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hb_font_get_reference_count (hb_font_t *font)
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{
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HB_OBJECT_DO_GET_REFERENCE_COUNT (font);
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}
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void
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hb_font_destroy (hb_font_t *font)
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{
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HB_OBJECT_DO_DESTROY (font);
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hb_font_funcs_destroy (font->klass);
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if (font->destroy)
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font->destroy (font->user_data);
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free (font);
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}
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void
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hb_font_set_funcs (hb_font_t *font,
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hb_font_funcs_t *klass,
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hb_destroy_func_t destroy,
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void *user_data)
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{
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if (HB_OBJECT_IS_INERT (font))
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return;
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if (font->destroy)
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font->destroy (font->user_data);
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if (!klass)
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klass = &_hb_font_funcs_nil;
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hb_font_funcs_reference (klass);
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hb_font_funcs_destroy (font->klass);
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font->klass = klass;
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font->destroy = destroy;
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font->user_data = user_data;
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}
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void
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hb_font_unset_funcs (hb_font_t *font,
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hb_font_funcs_t **klass,
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hb_destroy_func_t *destroy,
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void **user_data)
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{
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/* None of the input arguments can be NULL. */
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*klass = font->klass;
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*destroy = font->destroy;
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*user_data = font->user_data;
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if (HB_OBJECT_IS_INERT (font))
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return;
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font->klass = NULL;
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font->destroy = NULL;
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font->user_data = NULL;
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}
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void
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hb_font_set_scale (hb_font_t *font,
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unsigned int x_scale,
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unsigned int y_scale)
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{
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if (HB_OBJECT_IS_INERT (font))
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return;
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font->x_scale = x_scale;
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font->y_scale = y_scale;
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}
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void
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hb_font_get_scale (hb_font_t *font,
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unsigned int *x_scale,
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unsigned int *y_scale)
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{
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if (x_scale) *x_scale = font->x_scale;
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if (y_scale) *y_scale = font->y_scale;
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}
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void
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hb_font_set_ppem (hb_font_t *font,
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unsigned int x_ppem,
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unsigned int y_ppem)
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{
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if (HB_OBJECT_IS_INERT (font))
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return;
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font->x_ppem = x_ppem;
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font->y_ppem = y_ppem;
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}
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void
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hb_font_get_ppem (hb_font_t *font,
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unsigned int *x_ppem,
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unsigned int *y_ppem)
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|
{
|
|
if (x_ppem) *x_ppem = font->x_ppem;
|
|
if (y_ppem) *y_ppem = font->y_ppem;
|
|
}
|
|
|
|
|
|
HB_END_DECLS
|