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foot/font.h

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initial grid implementation This allows us to render *something*, even though it's inefficient, stupid and far far away from the real thing.
2019-06-13 16:24:35 +02:00
#pragma once
font: load FreeType face, and set it's pixel sizes
2019-07-28 12:09:22 +02:00
#include <stdbool.h>
font: set FT load and render flags from FontConfig properties
2019-07-29 20:10:55 +02:00
#include <threads.h>
font: add support for fallback fonts A top-level font now has a list of fallback fonts. When a glyph cannot be found, we try each fallback font in turn, until we either find one that has the glyph, or until we've exhausted the list. To make this actually work in practise (read: to make performance acceptable), the cache is re-worked and is now populated on demand. It also supports non-ASCII characters, by using the 4-byte unicode character as index instead. Since having an array that can be indexed by a 4-byte value isn't really viable, we now have a simple hash table instead of an array.
2019-07-30 18:04:28 +02:00
#include <ft2build.h>
#include FT_FREETYPE_H
#include FT_LCD_FILTER_H
#include <cairo.h>
initial grid implementation This allows us to render *something*, even though it's inefficient, stupid and far far away from the real thing.
2019-06-13 16:24:35 +02:00
font: add support for fallback fonts A top-level font now has a list of fallback fonts. When a glyph cannot be found, we try each fallback font in turn, until we either find one that has the glyph, or until we've exhausted the list. To make this actually work in practise (read: to make performance acceptable), the cache is re-worked and is now populated on demand. It also supports non-ASCII characters, by using the 4-byte unicode character as index instead. Since having an array that can be indexed by a 4-byte value isn't really viable, we now have a simple hash table instead of an array.
2019-07-30 18:04:28 +02:00
#include "tllist.h"
//#include "terminal.h"
typedef tll(const char *) font_list_t;
struct glyph {
wchar_t wc;
font: initial support for double-width *and* color emoji glyphs Fonts are now loaded with FT_LOAD_COLOR and we recognize and support the FT_PIXEL_MODE_BGRA pixel mode. This is mapped to a CAIRO_FORMAT_ARGB32 surface, that is blitted as-is (instead of used as a mask like we do for gray and mono glyphs). Furthermore, since many emojis are double-width, we add initial support for double-width glyphs. These are assumed to always be utf8. When PRINT:ing an utf8 character, we check its width, and add empty "spacer" cells after the cell with the multi-column glyph. When rendering, we render the columns in each row backwards. This ensures the spacer cells get cleared *before* we render the glyph (so that we don't end up erasing part of the glyph). Finally, emoji fonts are usually bitmap fonts with *large* glyphs. These aren't automatically scaled down. I.e. even if we request a glyph of 13 pixels, we might end up getting a 100px glyph. To handle this, fontconfig must be configured to scale bitmap fonts. When it is, we can look at the 'scalable' and 'pixelsizefixup' properties, and use these to scale the rendered glyph.
2019-07-31 18:03:35 +02:00
int width;
font: add support for fallback fonts A top-level font now has a list of fallback fonts. When a glyph cannot be found, we try each fallback font in turn, until we either find one that has the glyph, or until we've exhausted the list. To make this actually work in practise (read: to make performance acceptable), the cache is re-worked and is now populated on demand. It also supports non-ASCII characters, by using the 4-byte unicode character as index instead. Since having an array that can be indexed by a 4-byte value isn't really viable, we now have a simple hash table instead of an array.
2019-07-30 18:04:28 +02:00
cairo_surface_t *surf;
int left;
int top;
font: initial support for double-width *and* color emoji glyphs Fonts are now loaded with FT_LOAD_COLOR and we recognize and support the FT_PIXEL_MODE_BGRA pixel mode. This is mapped to a CAIRO_FORMAT_ARGB32 surface, that is blitted as-is (instead of used as a mask like we do for gray and mono glyphs). Furthermore, since many emojis are double-width, we add initial support for double-width glyphs. These are assumed to always be utf8. When PRINT:ing an utf8 character, we check its width, and add empty "spacer" cells after the cell with the multi-column glyph. When rendering, we render the columns in each row backwards. This ensures the spacer cells get cleared *before* we render the glyph (so that we don't end up erasing part of the glyph). Finally, emoji fonts are usually bitmap fonts with *large* glyphs. These aren't automatically scaled down. I.e. even if we request a glyph of 13 pixels, we might end up getting a 100px glyph. To handle this, fontconfig must be configured to scale bitmap fonts. When it is, we can look at the 'scalable' and 'pixelsizefixup' properties, and use these to scale the rendered glyph.
2019-07-31 18:03:35 +02:00
double pixel_size_fixup;
font: add support for fallback fonts A top-level font now has a list of fallback fonts. When a glyph cannot be found, we try each fallback font in turn, until we either find one that has the glyph, or until we've exhausted the list. To make this actually work in practise (read: to make performance acceptable), the cache is re-worked and is now populated on demand. It also supports non-ASCII characters, by using the 4-byte unicode character as index instead. Since having an array that can be indexed by a 4-byte value isn't really viable, we now have a simple hash table instead of an array.
2019-07-30 18:04:28 +02:00
};
typedef tll(struct glyph) hash_entry_t;
struct font {
FT_Face face;
int load_flags;
int render_flags;
FT_LcdFilter lcd_filter;
font: initial support for double-width *and* color emoji glyphs Fonts are now loaded with FT_LOAD_COLOR and we recognize and support the FT_PIXEL_MODE_BGRA pixel mode. This is mapped to a CAIRO_FORMAT_ARGB32 surface, that is blitted as-is (instead of used as a mask like we do for gray and mono glyphs). Furthermore, since many emojis are double-width, we add initial support for double-width glyphs. These are assumed to always be utf8. When PRINT:ing an utf8 character, we check its width, and add empty "spacer" cells after the cell with the multi-column glyph. When rendering, we render the columns in each row backwards. This ensures the spacer cells get cleared *before* we render the glyph (so that we don't end up erasing part of the glyph). Finally, emoji fonts are usually bitmap fonts with *large* glyphs. These aren't automatically scaled down. I.e. even if we request a glyph of 13 pixels, we might end up getting a 100px glyph. To handle this, fontconfig must be configured to scale bitmap fonts. When it is, we can look at the 'scalable' and 'pixelsizefixup' properties, and use these to scale the rendered glyph.
2019-07-31 18:03:35 +02:00
double pixel_size_fixup; /* Scale factor - should only be used with ARGB32 glyphs */
font: add support for fallback fonts A top-level font now has a list of fallback fonts. When a glyph cannot be found, we try each fallback font in turn, until we either find one that has the glyph, or until we've exhausted the list. To make this actually work in practise (read: to make performance acceptable), the cache is re-worked and is now populated on demand. It also supports non-ASCII characters, by using the 4-byte unicode character as index instead. Since having an array that can be indexed by a 4-byte value isn't really viable, we now have a simple hash table instead of an array.
2019-07-30 18:04:28 +02:00
struct {
double position;
double thickness;
} underline;
font: initial support for double-width *and* color emoji glyphs Fonts are now loaded with FT_LOAD_COLOR and we recognize and support the FT_PIXEL_MODE_BGRA pixel mode. This is mapped to a CAIRO_FORMAT_ARGB32 surface, that is blitted as-is (instead of used as a mask like we do for gray and mono glyphs). Furthermore, since many emojis are double-width, we add initial support for double-width glyphs. These are assumed to always be utf8. When PRINT:ing an utf8 character, we check its width, and add empty "spacer" cells after the cell with the multi-column glyph. When rendering, we render the columns in each row backwards. This ensures the spacer cells get cleared *before* we render the glyph (so that we don't end up erasing part of the glyph). Finally, emoji fonts are usually bitmap fonts with *large* glyphs. These aren't automatically scaled down. I.e. even if we request a glyph of 13 pixels, we might end up getting a 100px glyph. To handle this, fontconfig must be configured to scale bitmap fonts. When it is, we can look at the 'scalable' and 'pixelsizefixup' properties, and use these to scale the rendered glyph.
2019-07-31 18:03:35 +02:00
font: add support for fallback fonts A top-level font now has a list of fallback fonts. When a glyph cannot be found, we try each fallback font in turn, until we either find one that has the glyph, or until we've exhausted the list. To make this actually work in practise (read: to make performance acceptable), the cache is re-worked and is now populated on demand. It also supports non-ASCII characters, by using the 4-byte unicode character as index instead. Since having an array that can be indexed by a 4-byte value isn't really viable, we now have a simple hash table instead of an array.
2019-07-30 18:04:28 +02:00
struct {
double position;
double thickness;
} strikeout;
bool is_fallback;
tll(char *) fallbacks;
hash_entry_t **cache;
mtx_t lock;
};
bool font_from_name(font_list_t names, const char *attributes, struct font *result);
const struct glyph *font_glyph_for_utf8(struct font *font, const char *utf8);
font: populate glyph cache (ASCII characters only) when instantiating font
2019-07-28 21:03:38 +02:00
void font_destroy(struct font *font);
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