9b28a5083e
* src/ftcrfont.c (ftcrfont_open): * src/ftfont.c (ftfont_open2): Make font->height equal to sum of font->ascent and font->descent. Respect :minspace property. (ftfont_open2): Remove redundant assignment. (syms_of_ftfont) <QCminspace>: New DEFSYM.
416 lines
12 KiB
C
416 lines
12 KiB
C
/* ftcrfont.c -- FreeType font driver on cairo.
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Copyright (C) 2015-2019 Free Software Foundation, Inc.
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This file is part of GNU Emacs.
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GNU Emacs is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or (at
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your option) any later version.
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GNU Emacs is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>. */
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#include <config.h>
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#include <stdio.h>
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#include <math.h>
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#include <cairo-ft.h>
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#include "lisp.h"
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#include "xterm.h"
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#include "blockinput.h"
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#include "composite.h"
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#include "font.h"
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#include "ftfont.h"
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#include "pdumper.h"
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#define METRICS_NCOLS_PER_ROW (128)
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enum metrics_status
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{
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METRICS_INVALID = -1, /* metrics entry is invalid */
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};
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#define METRICS_STATUS(metrics) ((metrics)->ascent + (metrics)->descent)
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#define METRICS_SET_STATUS(metrics, status) \
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((metrics)->ascent = 0, (metrics)->descent = (status))
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static int
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ftcrfont_glyph_extents (struct font *font,
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unsigned glyph,
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struct font_metrics *metrics)
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{
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struct font_info *ftcrfont_info = (struct font_info *) font;
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int row, col;
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struct font_metrics *cache;
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row = glyph / METRICS_NCOLS_PER_ROW;
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col = glyph % METRICS_NCOLS_PER_ROW;
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if (row >= ftcrfont_info->metrics_nrows)
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{
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ftcrfont_info->metrics =
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xrealloc (ftcrfont_info->metrics,
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sizeof (struct font_metrics *) * (row + 1));
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memset (ftcrfont_info->metrics + ftcrfont_info->metrics_nrows, 0,
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(sizeof (struct font_metrics *)
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* (row + 1 - ftcrfont_info->metrics_nrows)));
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ftcrfont_info->metrics_nrows = row + 1;
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}
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if (ftcrfont_info->metrics[row] == NULL)
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{
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struct font_metrics *new;
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int i;
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new = xmalloc (sizeof (struct font_metrics) * METRICS_NCOLS_PER_ROW);
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for (i = 0; i < METRICS_NCOLS_PER_ROW; i++)
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METRICS_SET_STATUS (new + i, METRICS_INVALID);
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ftcrfont_info->metrics[row] = new;
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}
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cache = ftcrfont_info->metrics[row] + col;
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if (METRICS_STATUS (cache) == METRICS_INVALID)
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{
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cairo_glyph_t cr_glyph = {.index = glyph};
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cairo_text_extents_t extents;
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FT_Activate_Size (ftcrfont_info->ft_size_draw);
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cairo_scaled_font_glyph_extents (ftcrfont_info->cr_scaled_font,
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&cr_glyph, 1, &extents);
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cache->lbearing = floor (extents.x_bearing);
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cache->rbearing = ceil (extents.width + extents.x_bearing);
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cache->width = lround (extents.x_advance);
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cache->ascent = ceil (- extents.y_bearing);
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cache->descent = ceil (extents.height + extents.y_bearing);
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}
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if (metrics)
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*metrics = *cache;
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return cache->width;
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}
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static Lisp_Object
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ftcrfont_list (struct frame *f, Lisp_Object spec)
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{
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Lisp_Object list = ftfont_list (f, spec), tail;
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for (tail = list; CONSP (tail); tail = XCDR (tail))
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ASET (XCAR (tail), FONT_TYPE_INDEX, Qftcr);
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return list;
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}
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static Lisp_Object
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ftcrfont_match (struct frame *f, Lisp_Object spec)
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{
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Lisp_Object entity = ftfont_match (f, spec);
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if (VECTORP (entity))
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ASET (entity, FONT_TYPE_INDEX, Qftcr);
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return entity;
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}
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static Lisp_Object
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ftcrfont_open (struct frame *f, Lisp_Object entity, int pixel_size)
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{
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Lisp_Object font_object;
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FT_UInt size = XFIXNUM (AREF (entity, FONT_SIZE_INDEX));
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if (size == 0)
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size = pixel_size;
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font_object = font_build_object (VECSIZE (struct font_info),
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Qftcr, entity, size);
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block_input ();
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font_object = ftfont_open2 (f, entity, pixel_size, font_object);
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if (FONT_OBJECT_P (font_object))
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{
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struct font *font = XFONT_OBJECT (font_object);
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struct font_info *ftcrfont_info = (struct font_info *) font;
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FT_Face ft_face = ftcrfont_info->ft_size->face;
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font->driver = &ftcrfont_driver;
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FT_New_Size (ft_face, &ftcrfont_info->ft_size_draw);
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FT_Activate_Size (ftcrfont_info->ft_size_draw);
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if (ftcrfont_info->bitmap_strike_index < 0)
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FT_Set_Pixel_Sizes (ft_face, 0, font->pixel_size);
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else
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FT_Select_Size (ft_face, ftcrfont_info->bitmap_strike_index);
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cairo_font_face_t *font_face =
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cairo_ft_font_face_create_for_ft_face (ft_face, 0);
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cairo_matrix_t font_matrix, ctm;
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cairo_matrix_init_scale (&font_matrix, pixel_size, pixel_size);
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cairo_matrix_init_identity (&ctm);
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cairo_font_options_t *options = cairo_font_options_create ();
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ftcrfont_info->cr_scaled_font =
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cairo_scaled_font_create (font_face, &font_matrix, &ctm, options);
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cairo_font_face_destroy (font_face);
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cairo_font_options_destroy (options);
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ftcrfont_info->metrics = NULL;
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ftcrfont_info->metrics_nrows = 0;
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if (ftcrfont_info->bitmap_strike_index >= 0)
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{
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/* Several members of struct font/font_info set by
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ftfont_open2 are bogus. Recalculate them with cairo
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scaled font functions. */
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cairo_font_extents_t extents;
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cairo_scaled_font_extents (ftcrfont_info->cr_scaled_font, &extents);
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font->ascent = lround (extents.ascent);
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Lisp_Object val = assq_no_quit (QCminspace,
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AREF (entity, FONT_EXTRA_INDEX));
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if (!(CONSP (val) && NILP (XCDR (val))))
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{
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font->descent = lround (extents.descent);
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font->height = font->ascent + font->descent;
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}
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else
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{
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font->height = lround (extents.height);
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font->descent = font->height - font->ascent;
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}
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cairo_glyph_t stack_glyph;
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int n = 0;
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font->min_width = font->average_width = font->space_width = 0;
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for (char c = 32; c < 127; c++)
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{
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cairo_glyph_t *glyphs = &stack_glyph;
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int num_glyphs = 1;
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cairo_status_t status =
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cairo_scaled_font_text_to_glyphs (ftcrfont_info->cr_scaled_font,
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0, 0, &c, 1,
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&glyphs, &num_glyphs,
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NULL, NULL, NULL);
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if (status == CAIRO_STATUS_SUCCESS)
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{
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if (glyphs != &stack_glyph)
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cairo_glyph_free (glyphs);
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else
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{
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int this_width =
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ftcrfont_glyph_extents (font, stack_glyph.index, NULL);
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if (this_width > 0
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&& (! font->min_width
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|| font->min_width > this_width))
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font->min_width = this_width;
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if (c == 32)
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font->space_width = this_width;
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font->average_width += this_width;
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n++;
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}
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}
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}
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if (n > 0)
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font->average_width /= n;
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font->underline_position = -1;
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font->underline_thickness = 0;
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}
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}
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unblock_input ();
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return font_object;
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}
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static void
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ftcrfont_close (struct font *font)
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{
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if (font_data_structures_may_be_ill_formed ())
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return;
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struct font_info *ftcrfont_info = (struct font_info *) font;
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int i;
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block_input ();
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for (i = 0; i < ftcrfont_info->metrics_nrows; i++)
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if (ftcrfont_info->metrics[i])
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xfree (ftcrfont_info->metrics[i]);
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if (ftcrfont_info->metrics)
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xfree (ftcrfont_info->metrics);
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FT_Done_Size (ftcrfont_info->ft_size_draw);
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cairo_scaled_font_destroy (ftcrfont_info->cr_scaled_font);
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unblock_input ();
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ftfont_close (font);
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}
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static void
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ftcrfont_text_extents (struct font *font,
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unsigned *code,
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int nglyphs,
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struct font_metrics *metrics)
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{
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int width, i;
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block_input ();
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width = ftcrfont_glyph_extents (font, code[0], metrics);
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for (i = 1; i < nglyphs; i++)
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{
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struct font_metrics m;
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int w = ftcrfont_glyph_extents (font, code[i], metrics ? &m : NULL);
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if (metrics)
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{
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if (width + m.lbearing < metrics->lbearing)
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metrics->lbearing = width + m.lbearing;
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if (width + m.rbearing > metrics->rbearing)
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metrics->rbearing = width + m.rbearing;
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if (m.ascent > metrics->ascent)
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metrics->ascent = m.ascent;
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if (m.descent > metrics->descent)
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metrics->descent = m.descent;
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}
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width += w;
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}
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unblock_input ();
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if (metrics)
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metrics->width = width;
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}
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static int
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ftcrfont_get_bitmap (struct font *font, unsigned int code,
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struct font_bitmap *bitmap, int bits_per_pixel)
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{
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struct font_info *ftcrfont_info = (struct font_info *) font;
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if (ftcrfont_info->bitmap_strike_index < 0)
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return ftfont_get_bitmap (font, code, bitmap, bits_per_pixel);
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return -1;
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}
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static int
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ftcrfont_anchor_point (struct font *font, unsigned int code, int idx,
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int *x, int *y)
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{
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struct font_info *ftcrfont_info = (struct font_info *) font;
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if (ftcrfont_info->bitmap_strike_index < 0)
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return ftfont_anchor_point (font, code, idx, x, y);
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return -1;
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}
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static Lisp_Object
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ftcrfont_shape (Lisp_Object lgstring)
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{
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#if defined HAVE_M17N_FLT && defined HAVE_LIBOTF
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struct font *font = CHECK_FONT_GET_OBJECT (LGSTRING_FONT (lgstring));
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struct font_info *ftcrfont_info = (struct font_info *) font;
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if (ftcrfont_info->bitmap_strike_index < 0)
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return ftfont_shape (lgstring);
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#endif
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return make_fixnum (0);
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}
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static int
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ftcrfont_draw (struct glyph_string *s,
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int from, int to, int x, int y, bool with_background)
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{
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struct frame *f = s->f;
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struct face *face = s->face;
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struct font_info *ftcrfont_info = (struct font_info *) s->font;
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cairo_t *cr;
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cairo_glyph_t *glyphs;
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cairo_surface_t *surface;
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cairo_surface_type_t surface_type;
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int len = to - from;
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int i;
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block_input ();
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cr = x_begin_cr_clip (f, s->gc);
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if (with_background)
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{
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x_set_cr_source_with_gc_background (f, s->gc);
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cairo_rectangle (cr, x, y - FONT_BASE (face->font),
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s->width, FONT_HEIGHT (face->font));
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cairo_fill (cr);
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}
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glyphs = alloca (sizeof (cairo_glyph_t) * len);
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for (i = 0; i < len; i++)
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{
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unsigned code = ((XCHAR2B_BYTE1 (s->char2b + from + i) << 8)
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| XCHAR2B_BYTE2 (s->char2b + from + i));
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glyphs[i].index = code;
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glyphs[i].x = x;
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glyphs[i].y = y;
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x += (s->padding_p ? 1 : ftcrfont_glyph_extents (s->font, code, NULL));
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}
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x_set_cr_source_with_gc_foreground (f, s->gc);
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cairo_set_scaled_font (cr, ftcrfont_info->cr_scaled_font);
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FT_Activate_Size (ftcrfont_info->ft_size_draw);
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cairo_show_glyphs (cr, glyphs, len);
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surface = cairo_get_target (cr);
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/* XXX: It used to be necessary to flush when exporting. It might
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be the case that this is no longer necessary. */
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surface_type = cairo_surface_get_type (surface);
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if (surface_type != CAIRO_SURFACE_TYPE_XLIB
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&& (surface_type != CAIRO_SURFACE_TYPE_IMAGE
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|| cairo_image_surface_get_format (surface) != CAIRO_FORMAT_ARGB32))
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cairo_surface_flush (surface);
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x_end_cr_clip (f);
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unblock_input ();
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return len;
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}
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static void syms_of_ftcrfont_for_pdumper (void);
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struct font_driver const ftcrfont_driver =
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{
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.type = LISPSYM_INITIALLY (Qftcr),
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.get_cache = ftfont_get_cache,
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.list = ftcrfont_list,
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.match = ftcrfont_match,
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.list_family = ftfont_list_family,
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.open = ftcrfont_open,
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.close = ftcrfont_close,
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.has_char = ftfont_has_char,
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.encode_char = ftfont_encode_char,
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.text_extents = ftcrfont_text_extents,
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.draw = ftcrfont_draw,
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.get_bitmap = ftcrfont_get_bitmap,
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.anchor_point = ftcrfont_anchor_point,
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#ifdef HAVE_LIBOTF
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.otf_capability = ftfont_otf_capability,
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#endif
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.shape = ftcrfont_shape,
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#ifdef HAVE_OTF_GET_VARIATION_GLYPHS
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.get_variation_glyphs = ftfont_variation_glyphs,
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#endif
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.filter_properties = ftfont_filter_properties,
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.combining_capability = ftfont_combining_capability,
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};
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void
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syms_of_ftcrfont (void)
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{
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DEFSYM (Qftcr, "ftcr");
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pdumper_do_now_and_after_load (syms_of_ftcrfont_for_pdumper);
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}
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static void
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syms_of_ftcrfont_for_pdumper (void)
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{
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register_font_driver (&ftcrfont_driver, NULL);
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}
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