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-rw-r--r--src/ftxfont.c371
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diff --git a/src/ftxfont.c b/src/ftxfont.c
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-/* ftxfont.c -- FreeType font driver on X (without using XFT).
- Copyright (C) 2006-2020 Free Software Foundation, Inc.
- Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011
- National Institute of Advanced Industrial Science and Technology (AIST)
- Registration Number H13PRO009
-
-This file is part of GNU Emacs.
-
-GNU Emacs is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 3 of the License, or (at
-your option) any later version.
-
-GNU Emacs is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>. */
-
-#include <config.h>
-#include <X11/Xlib.h>
-
-#include "lisp.h"
-#include "xterm.h"
-#include "frame.h"
-#include "blockinput.h"
-#include "font.h"
-#include "pdumper.h"
-
-/* FTX font driver. */
-
-struct ftxfont_frame_data
-{
- /* Background and foreground colors. */
- XColor colors[2];
- /* GCs interpolating the above colors. gcs[0] is for a color
- closest to BACKGROUND, and gcs[5] is for a color closest to
- FOREGROUND. */
- GC gcs[6];
- struct ftxfont_frame_data *next;
-};
-
-
-/* Return an array of 6 GCs for antialiasing. */
-
-static GC *
-ftxfont_get_gcs (struct frame *f, unsigned long foreground, unsigned long background)
-{
- XColor color;
- XGCValues xgcv;
- int i;
- struct ftxfont_frame_data *data = font_get_frame_data (f, Qftx);
- struct ftxfont_frame_data *prev = NULL, *this = NULL, *new;
-
- if (data)
- {
- for (this = data; this; prev = this, this = this->next)
- {
- if (this->colors[0].pixel < background)
- continue;
- if (this->colors[0].pixel > background)
- break;
- if (this->colors[1].pixel < foreground)
- continue;
- if (this->colors[1].pixel > foreground)
- break;
- return this->gcs;
- }
- }
-
- new = xmalloc (sizeof *new);
- new->next = this;
- if (prev)
- prev->next = new;
- font_put_frame_data (f, Qftx, new);
-
- new->colors[0].pixel = background;
- new->colors[1].pixel = foreground;
-
- block_input ();
- XQueryColors (FRAME_X_DISPLAY (f), FRAME_X_COLORMAP (f), new->colors, 2);
- for (i = 1; i < 7; i++)
- {
- /* Interpolate colors linearly. Any better algorithm? */
- color.red
- = (new->colors[1].red * i + new->colors[0].red * (8 - i)) / 8;
- color.green
- = (new->colors[1].green * i + new->colors[0].green * (8 - i)) / 8;
- color.blue
- = (new->colors[1].blue * i + new->colors[0].blue * (8 - i)) / 8;
- if (! x_alloc_nearest_color (f, FRAME_X_COLORMAP (f), &color))
- break;
- xgcv.foreground = color.pixel;
- new->gcs[i - 1] = XCreateGC (FRAME_X_DISPLAY (f), FRAME_X_DRAWABLE (f),
- GCForeground, &xgcv);
- }
- unblock_input ();
-
- if (i < 7)
- {
- block_input ();
- for (i--; i >= 0; i--)
- XFreeGC (FRAME_X_DISPLAY (f), new->gcs[i]);
- unblock_input ();
- if (prev)
- prev->next = new->next;
- else if (data)
- font_put_frame_data (f, Qftx, new->next);
- xfree (new);
- return NULL;
- }
- return new->gcs;
-}
-
-static int
-ftxfont_draw_bitmap (struct frame *f, GC gc_fore, GC *gcs, struct font *font,
- unsigned int code, int x, int y, XPoint *p, int size,
- int *n, bool flush)
-{
- struct font_bitmap bitmap;
- unsigned char *b;
- int i, j;
-
- if (ftfont_get_bitmap (font, code, &bitmap, size > 0x100 ? 1 : 8) < 0)
- return 0;
- if (size > 0x100)
- {
- for (i = 0, b = bitmap.buffer; i < bitmap.rows;
- i++, b += bitmap.pitch)
- {
- for (j = 0; j < bitmap.width; j++)
- if (b[j / 8] & (1 << (7 - (j % 8))))
- {
- p[n[0]].x = x + bitmap.left + j;
- p[n[0]].y = y - bitmap.top + i;
- if (++n[0] == size)
- {
- XDrawPoints (FRAME_X_DISPLAY (f), FRAME_X_DRAWABLE (f),
- gc_fore, p, size, CoordModeOrigin);
- n[0] = 0;
- }
- }
- }
- if (flush && n[0] > 0)
- XDrawPoints (FRAME_X_DISPLAY (f), FRAME_X_DRAWABLE (f),
- gc_fore, p, n[0], CoordModeOrigin);
- }
- else
- {
- for (i = 0, b = bitmap.buffer; i < bitmap.rows;
- i++, b += bitmap.pitch)
- {
- for (j = 0; j < bitmap.width; j++)
- {
- int idx = (bitmap.bits_per_pixel == 1
- ? ((b[j / 8] & (1 << (7 - (j % 8)))) ? 6 : -1)
- : (b[j] >> 5) - 1);
-
- if (idx >= 0)
- {
- XPoint *pp = p + size * idx;
-
- pp[n[idx]].x = x + bitmap.left + j;
- pp[n[idx]].y = y - bitmap.top + i;
- if (++(n[idx]) == size)
- {
- XDrawPoints (FRAME_X_DISPLAY (f), FRAME_X_DRAWABLE (f),
- idx == 6 ? gc_fore : gcs[idx], pp, size,
- CoordModeOrigin);
- n[idx] = 0;
- }
- }
- }
- }
- if (flush)
- {
- for (i = 0; i < 6; i++)
- if (n[i] > 0)
- XDrawPoints (FRAME_X_DISPLAY (f), FRAME_X_DRAWABLE (f),
- gcs[i], p + 0x100 * i, n[i], CoordModeOrigin);
- if (n[6] > 0)
- XDrawPoints (FRAME_X_DISPLAY (f), FRAME_X_DRAWABLE (f),
- gc_fore, p + 0x600, n[6], CoordModeOrigin);
- }
- }
-
- /* There is no ftfont_free_bitmap, so do not try to free BITMAP. */
-
- return bitmap.advance;
-}
-
-static void
-ftxfont_draw_background (struct frame *f, struct font *font, GC gc, int x, int y,
- int width)
-{
- XGCValues xgcv;
-
- XGetGCValues (FRAME_X_DISPLAY (f), gc,
- GCForeground | GCBackground, &xgcv);
- XSetForeground (FRAME_X_DISPLAY (f), gc, xgcv.background);
- XFillRectangle (FRAME_X_DISPLAY (f), FRAME_X_DRAWABLE (f), gc,
- x, y - FONT_BASE (font), width, FONT_HEIGHT (font));
- XSetForeground (FRAME_X_DISPLAY (f), gc, xgcv.foreground);
-}
-
-static Lisp_Object
-ftxfont_list (struct frame *f, Lisp_Object spec)
-{
- return ftfont_list2 (f, spec, Qftx);
-}
-
-static Lisp_Object
-ftxfont_match (struct frame *f, Lisp_Object spec)
-{
- return ftfont_match2 (f, spec, Qftx);
-}
-
-static Lisp_Object
-ftxfont_open (struct frame *f, Lisp_Object entity, int pixel_size)
-{
- Lisp_Object font_object = ftfont_open (f, entity, pixel_size);
- if (NILP (font_object))
- return Qnil;
- struct font *font = XFONT_OBJECT (font_object);
- font->driver = &ftxfont_driver;
- return font_object;
-}
-
-static void
-ftxfont_close (struct font *font)
-{
- ftfont_close (font);
-}
-
-static int
-ftxfont_draw (struct glyph_string *s, int from, int to, int x, int y,
- bool with_background)
-{
- struct frame *f = s->f;
- struct face *face = s->face;
- struct font *font = s->font;
- XPoint p[0x700];
- int n[7];
- unsigned *code = s->char2b + from;
- int len = to - from;
- int i;
- GC *gcs;
- int xadvance;
-
- n[0] = n[1] = n[2] = n[3] = n[4] = n[5] = n[6] = 0;
-
- block_input ();
- if (with_background)
- ftxfont_draw_background (f, font, s->gc, x, y, s->width);
-
- if (face->gc == s->gc)
- {
- gcs = ftxfont_get_gcs (f, face->foreground, face->background);
- }
- else
- {
- XGCValues xgcv;
- unsigned long mask = GCForeground | GCBackground;
-
- XGetGCValues (FRAME_X_DISPLAY (f), s->gc, mask, &xgcv);
- gcs = ftxfont_get_gcs (f, xgcv.foreground, xgcv.background);
- }
-
- if (gcs)
- {
- if (s->num_clips)
- for (i = 0; i < 6; i++)
- XSetClipRectangles (FRAME_X_DISPLAY (f), gcs[i], 0, 0,
- s->clip, s->num_clips, Unsorted);
-
- for (i = 0; i < len; i++)
- {
- xadvance = ftxfont_draw_bitmap (f, s->gc, gcs, font, code[i], x, y,
- p, 0x100, n, i + 1 == len);
- x += (s->padding_p ? 1 : xadvance);
- }
- if (s->num_clips)
- for (i = 0; i < 6; i++)
- XSetClipMask (FRAME_X_DISPLAY (f), gcs[i], None);
- }
- else
- {
- /* We can't draw with antialiasing.
- s->gc should already have a proper clipping setting. */
- for (i = 0; i < len; i++)
- {
- xadvance = ftxfont_draw_bitmap (f, s->gc, NULL, font, code[i], x, y,
- p, 0x700, n, i + 1 == len);
- x += (s->padding_p ? 1 : xadvance);
- }
- }
-
- unblock_input ();
-
- return len;
-}
-
-static int
-ftxfont_end_for_frame (struct frame *f)
-{
- struct ftxfont_frame_data *data = font_get_frame_data (f, Qftx);
-
- block_input ();
- while (data)
- {
- struct ftxfont_frame_data *next = data->next;
- int i;
-
- for (i = 0; i < 6; i++)
- XFreeGC (FRAME_X_DISPLAY (f), data->gcs[i]);
- xfree (data);
- data = next;
- }
- unblock_input ();
- font_put_frame_data (f, Qftx, NULL);
- return 0;
-}
-
-
-
-static void syms_of_ftxfont_for_pdumper (void);
-
-struct font_driver const ftxfont_driver =
- {
- /* We can't draw a text without device dependent functions. */
- .type = LISPSYM_INITIALLY (Qftx),
- .get_cache = ftfont_get_cache,
- .list = ftxfont_list,
- .match = ftxfont_match,
- .list_family = ftfont_list_family,
- .open_font = ftxfont_open,
- .close_font = ftxfont_close,
- .has_char = ftfont_has_char,
- .encode_char = ftfont_encode_char,
- .text_extents = ftfont_text_extents,
- .draw = ftxfont_draw,
- .get_bitmap = ftfont_get_bitmap,
- .anchor_point = ftfont_anchor_point,
-#ifdef HAVE_LIBOTF
- .otf_capability = ftfont_otf_capability,
-#endif
- .end_for_frame = ftxfont_end_for_frame,
-#if defined HAVE_M17N_FLT && defined HAVE_LIBOTF
- .shape = ftfont_shape,
-#endif
-#if defined HAVE_OTF_GET_VARIATION_GLYPHS || defined HAVE_FT_FACE_GETCHARVARIANTINDEX
- .get_variation_glyphs = ftfont_variation_glyphs,
-#endif
- .filter_properties = ftfont_filter_properties,
- .combining_capability = ftfont_combining_capability,
- };
-
-void
-syms_of_ftxfont (void)
-{
- DEFSYM (Qftx, "ftx");
- pdumper_do_now_and_after_load (syms_of_ftxfont_for_pdumper);
-}
-
-static void
-syms_of_ftxfont_for_pdumper (void)
-{
- register_font_driver (&ftxfont_driver, NULL);
-}
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