263 lines
6.6 KiB
C
263 lines
6.6 KiB
C
/*
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* Copyright (C) 2009 Red Hat, Inc.
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* Copyright (C) 2009 Keith Stribley
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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-ft.h"
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#include "hb-font-private.h"
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#include FT_TRUETYPE_TABLES_H
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HB_BEGIN_DECLS
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static hb_codepoint_t
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hb_ft_get_glyph (hb_font_t *font HB_UNUSED,
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hb_face_t *face HB_UNUSED,
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const void *user_data,
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hb_codepoint_t unicode,
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hb_codepoint_t variation_selector)
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{
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FT_Face ft_face = (FT_Face) user_data;
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#ifdef HAVE_FT_FACE_GETCHARVARIANTINDEX
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if (unlikely (variation_selector)) {
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hb_codepoint_t glyph = FT_Face_GetCharVariantIndex (ft_face, unicode, variation_selector);
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if (glyph)
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return glyph;
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}
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#endif
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return FT_Get_Char_Index (ft_face, unicode);
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}
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static void
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hb_ft_get_glyph_advance (hb_font_t *font HB_UNUSED,
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hb_face_t *face HB_UNUSED,
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const void *user_data,
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hb_codepoint_t glyph,
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hb_position_t *x_advance,
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hb_position_t *y_advance)
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{
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FT_Face ft_face = (FT_Face) user_data;
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int load_flags = FT_LOAD_DEFAULT;
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/* TODO: load_flags, embolden, etc */
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if (likely (!FT_Load_Glyph (ft_face, glyph, load_flags)))
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{
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*x_advance = ft_face->glyph->advance.x;
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*y_advance = ft_face->glyph->advance.y;
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}
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}
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static void
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hb_ft_get_glyph_extents (hb_font_t *font HB_UNUSED,
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hb_face_t *face HB_UNUSED,
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const void *user_data,
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hb_codepoint_t glyph,
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hb_glyph_extents_t *extents)
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{
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FT_Face ft_face = (FT_Face) user_data;
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int load_flags = FT_LOAD_DEFAULT;
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/* TODO: load_flags, embolden, etc */
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if (likely (!FT_Load_Glyph (ft_face, glyph, load_flags)))
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{
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/* XXX: A few negations should be in order here, not sure. */
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extents->x_bearing = ft_face->glyph->metrics.horiBearingX;
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extents->y_bearing = ft_face->glyph->metrics.horiBearingY;
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extents->width = ft_face->glyph->metrics.width;
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extents->height = ft_face->glyph->metrics.height;
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}
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}
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static hb_bool_t
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hb_ft_get_contour_point (hb_font_t *font HB_UNUSED,
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hb_face_t *face HB_UNUSED,
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const void *user_data,
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unsigned int point_index,
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hb_codepoint_t glyph,
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hb_position_t *x,
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hb_position_t *y)
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{
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FT_Face ft_face = (FT_Face) user_data;
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int load_flags = FT_LOAD_DEFAULT;
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/* TODO: load_flags, embolden, etc */
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if (unlikely (FT_Load_Glyph (ft_face, glyph, load_flags)))
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return FALSE;
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if (unlikely (ft_face->glyph->format != FT_GLYPH_FORMAT_OUTLINE))
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return FALSE;
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if (unlikely (point_index >= (unsigned int) ft_face->glyph->outline.n_points))
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return FALSE;
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*x = ft_face->glyph->outline.points[point_index].x;
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*y = ft_face->glyph->outline.points[point_index].y;
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return TRUE;
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}
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static hb_position_t
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hb_ft_get_kerning (hb_font_t *font HB_UNUSED,
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hb_face_t *face HB_UNUSED,
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const void *user_data,
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hb_codepoint_t first_glyph,
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hb_codepoint_t second_glyph)
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{
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FT_Face ft_face = (FT_Face) user_data;
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FT_Vector kerning;
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/* TODO: Kern type? */
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if (FT_Get_Kerning (ft_face, first_glyph, second_glyph, FT_KERNING_DEFAULT, &kerning))
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return 0;
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return kerning.x;
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}
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static hb_font_funcs_t ft_ffuncs = {
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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_ft_get_glyph,
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hb_ft_get_glyph_advance,
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hb_ft_get_glyph_extents,
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hb_ft_get_contour_point,
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hb_ft_get_kerning
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}
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};
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hb_font_funcs_t *
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hb_ft_get_font_funcs (void)
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{
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return &ft_ffuncs;
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}
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static hb_blob_t *
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get_table (hb_tag_t tag, void *user_data)
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{
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FT_Face ft_face = (FT_Face) user_data;
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FT_Byte *buffer;
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FT_ULong length = 0;
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FT_Error error;
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if (unlikely (tag == HB_TAG_NONE))
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return NULL;
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error = FT_Load_Sfnt_Table (ft_face, tag, 0, NULL, &length);
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if (error)
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return NULL;
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/* TODO Use FT_Memory? */
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buffer = (FT_Byte *) malloc (length);
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if (buffer == NULL)
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return NULL;
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error = FT_Load_Sfnt_Table (ft_face, tag, 0, buffer, &length);
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if (error)
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return NULL;
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return hb_blob_create ((const char *) buffer, length,
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HB_MEMORY_MODE_WRITABLE,
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free, buffer);
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}
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hb_face_t *
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hb_ft_face_create (FT_Face ft_face,
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hb_destroy_func_t destroy)
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{
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hb_face_t *face;
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if (ft_face->stream->read == NULL) {
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hb_blob_t *blob;
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blob = hb_blob_create ((const char *) ft_face->stream->base,
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(unsigned int) ft_face->stream->size,
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/* TODO: Check FT_FACE_FLAG_EXTERNAL_STREAM? */
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HB_MEMORY_MODE_READONLY_MAY_MAKE_WRITABLE,
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destroy, ft_face);
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face = hb_face_create_for_data (blob, ft_face->face_index);
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hb_blob_destroy (blob);
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} else {
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face = hb_face_create_for_tables (get_table, destroy, ft_face);
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}
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return face;
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}
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static void
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hb_ft_face_finalize (FT_Face ft_face)
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{
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hb_face_destroy ((hb_face_t *) ft_face->generic.data);
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}
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hb_face_t *
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hb_ft_face_create_cached (FT_Face ft_face)
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{
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if (unlikely (!ft_face->generic.data || ft_face->generic.finalizer != (FT_Generic_Finalizer) hb_ft_face_finalize))
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{
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if (ft_face->generic.finalizer)
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ft_face->generic.finalizer (ft_face);
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ft_face->generic.data = hb_ft_face_create (ft_face, NULL);
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ft_face->generic.finalizer = (FT_Generic_Finalizer) hb_ft_face_finalize;
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}
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return hb_face_reference ((hb_face_t *) ft_face->generic.data);
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}
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hb_font_t *
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hb_ft_font_create (FT_Face ft_face,
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hb_destroy_func_t destroy)
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{
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hb_font_t *font;
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font = hb_font_create ();
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hb_font_set_funcs (font,
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hb_ft_get_font_funcs (),
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destroy, ft_face);
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hb_font_set_scale (font,
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((uint64_t) ft_face->size->metrics.x_scale * (uint64_t) ft_face->units_per_EM) >> 16,
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((uint64_t) ft_face->size->metrics.y_scale * (uint64_t) ft_face->units_per_EM) >> 16);
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hb_font_set_ppem (font,
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ft_face->size->metrics.x_ppem,
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ft_face->size->metrics.y_ppem);
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return font;
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}
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HB_END_DECLS
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