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Use system fonts as fallback and improve system font handling.

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Add support for font weight and stretch selection when using system fonts.
Add function to get system fallback font from a font name, style, text, and language code.
Implement system font support for Android.
Use system fonts as a last resort fallback.
This commit is contained in:
bruvzg
2022-11-21 15:04:01 +02:00
parent 015dc492de
commit ecec415988
51 changed files with 2756 additions and 150 deletions
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243
modules/text_server_fb/text_server_fb.cpp
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@@ -34,6 +34,7 @@
// Headers for building as GDExtension plug-in.
#include <godot_cpp/classes/file_access.hpp>
#include <godot_cpp/classes/os.hpp>
#include <godot_cpp/classes/project_settings.hpp>
#include <godot_cpp/classes/rendering_server.hpp>
#include <godot_cpp/classes/translation_server.hpp>
@@ -49,6 +50,7 @@ using namespace godot;
#include "core/config/project_settings.h"
#include "core/error/error_macros.h"
#include "core/string/print_string.h"
#include "core/string/translation.h"
#include "core/string/ucaps.h"
#include "modules/modules_enabled.gen.h" // For freetype, msdfgen, svg.
@@ -852,11 +854,13 @@ _FORCE_INLINE_ bool TextServerFallback::_ensure_cache_for_size(FontFallback *p_f
if (fd->face->style_name != nullptr) {
p_font_data->style_name = String::utf8((const char *)fd->face->style_name);
}
p_font_data->weight = _font_get_weight_by_name(p_font_data->style_name.to_lower());
p_font_data->stretch = _font_get_stretch_by_name(p_font_data->style_name.to_lower());
p_font_data->style_flags = 0;
if (fd->face->style_flags & FT_STYLE_FLAG_BOLD) {
if ((fd->face->style_flags & FT_STYLE_FLAG_BOLD) || p_font_data->weight >= 700) {
p_font_data->style_flags.set_flag(FONT_BOLD);
}
if (fd->face->style_flags & FT_STYLE_FLAG_ITALIC) {
if ((fd->face->style_flags & FT_STYLE_FLAG_ITALIC) || _is_ital_style(p_font_data->style_name.to_lower())) {
p_font_data->style_flags.set_flag(FONT_ITALIC);
}
if (fd->face->face_flags & FT_FACE_FLAG_FIXED_WIDTH) {
@@ -1061,6 +1065,46 @@ String TextServerFallback::_font_get_style_name(const RID &p_font_rid) const {
return fd->style_name;
}
void TextServerFallback::_font_set_weight(const RID &p_font_rid, int64_t p_weight) {
FontFallback *fd = font_owner.get_or_null(p_font_rid);
ERR_FAIL_COND(!fd);
MutexLock lock(fd->mutex);
Vector2i size = _get_size(fd, 16);
ERR_FAIL_COND(!_ensure_cache_for_size(fd, size));
fd->weight = CLAMP(p_weight, 100, 999);
}
int64_t TextServerFallback::_font_get_weight(const RID &p_font_rid) const {
FontFallback *fd = font_owner.get_or_null(p_font_rid);
ERR_FAIL_COND_V(!fd, 400);
MutexLock lock(fd->mutex);
Vector2i size = _get_size(fd, 16);
ERR_FAIL_COND_V(!_ensure_cache_for_size(fd, size), 400);
return fd->weight;
}
void TextServerFallback::_font_set_stretch(const RID &p_font_rid, int64_t p_stretch) {
FontFallback *fd = font_owner.get_or_null(p_font_rid);
ERR_FAIL_COND(!fd);
MutexLock lock(fd->mutex);
Vector2i size = _get_size(fd, 16);
ERR_FAIL_COND(!_ensure_cache_for_size(fd, size));
fd->stretch = CLAMP(p_stretch, 50, 200);
}
int64_t TextServerFallback::_font_get_stretch(const RID &p_font_rid) const {
FontFallback *fd = font_owner.get_or_null(p_font_rid);
ERR_FAIL_COND_V(!fd, 100);
MutexLock lock(fd->mutex);
Vector2i size = _get_size(fd, 16);
ERR_FAIL_COND_V(!_ensure_cache_for_size(fd, size), 100);
return fd->stretch;
}
void TextServerFallback::_font_set_name(const RID &p_font_rid, const String &p_name) {
FontFallback *fd = font_owner.get_or_null(p_font_rid);
ERR_FAIL_COND(!fd);
@@ -1197,6 +1241,25 @@ int64_t TextServerFallback::_font_get_fixed_size(const RID &p_font_rid) const {
return fd->fixed_size;
}
void TextServerFallback::_font_set_allow_system_fallback(const RID &p_font_rid, bool p_allow_system_fallback) {
FontFallback *fd = font_owner.get_or_null(p_font_rid);
ERR_FAIL_COND(!fd);
MutexLock lock(fd->mutex);
if (fd->allow_system_fallback != p_allow_system_fallback) {
_font_clear_cache(fd);
fd->allow_system_fallback = p_allow_system_fallback;
}
}
bool TextServerFallback::_font_is_allow_system_fallback(const RID &p_font_rid) const {
FontFallback *fd = font_owner.get_or_null(p_font_rid);
ERR_FAIL_COND_V(!fd, false);
MutexLock lock(fd->mutex);
return fd->allow_system_fallback;
}
void TextServerFallback::_font_set_force_autohinter(const RID &p_font_rid, bool p_force_autohinter) {
FontFallback *fd = font_owner.get_or_null(p_font_rid);
ERR_FAIL_COND(!fd);
@@ -3603,6 +3666,7 @@ bool TextServerFallback::_shaped_text_shape(const RID &p_shaped) {
sd->glyphs.push_back(gl);
} else {
// Text span.
RID prev_font;
for (int j = span.start; j < span.end; j++) {
Glyph gl;
gl.start = j;
@@ -3623,6 +3687,170 @@ bool TextServerFallback::_shaped_text_shape(const RID &p_shaped) {
break;
}
}
if (!gl.font_rid.is_valid() && prev_font.is_valid()) {
if (_font_has_char(prev_font, gl.index)) {
gl.font_rid = prev_font;
}
}
if (!gl.font_rid.is_valid() && OS::get_singleton()->has_feature("system_fonts") && span.fonts.size() > 0) {
// Try system fallback.
RID fdef = span.fonts[0];
if (_font_is_allow_system_fallback(fdef)) {
String text = sd->text.substr(j, 1);
String font_name = _font_get_name(fdef);
BitField<FontStyle> font_style = _font_get_style(fdef);
int font_weight = _font_get_weight(fdef);
int font_stretch = _font_get_stretch(fdef);
Dictionary dvar = _font_get_variation_coordinates(fdef);
static int64_t wgth_tag = _name_to_tag("weight");
static int64_t wdth_tag = _name_to_tag("width");
static int64_t ital_tag = _name_to_tag("italic");
if (dvar.has(wgth_tag)) {
font_weight = dvar[wgth_tag].operator int();
}
if (dvar.has(wdth_tag)) {
font_stretch = dvar[wdth_tag].operator int();
}
if (dvar.has(ital_tag) && dvar[ital_tag].operator int() == 1) {
font_style.set_flag(TextServer::FONT_ITALIC);
}
String locale = (span.language.is_empty()) ? TranslationServer::get_singleton()->get_tool_locale() : span.language;
PackedStringArray fallback_font_name = OS::get_singleton()->get_system_font_path_for_text(font_name, text, locale, String(), font_weight, font_stretch, font_style & TextServer::FONT_ITALIC);
#ifdef GDEXTENSION
for (int fb = 0; fb < fallback_font_name.size(); fb++) {
const String &E = fallback_font_name[fb];
#else
for (const String &E : fallback_font_name) {
#endif
SystemFontKey key = SystemFontKey(E, font_style & TextServer::FONT_ITALIC, font_weight, font_stretch, fdef, this);
if (system_fonts.has(key)) {
const SystemFontCache &sysf_cache = system_fonts[key];
int best_score = 0;
int best_match = -1;
for (int face_idx = 0; face_idx < sysf_cache.var.size(); face_idx++) {
const SystemFontCacheRec &F = sysf_cache.var[face_idx];
if (unlikely(!_font_has_char(F.rid, text[0]))) {
continue;
}
BitField<FontStyle> style = _font_get_style(F.rid);
int weight = _font_get_weight(F.rid);
int stretch = _font_get_stretch(F.rid);
int score = (20 - Math::abs(weight - font_weight) / 50);
score += (20 - Math::abs(stretch - font_stretch) / 10);
if (bool(style & TextServer::FONT_ITALIC) == bool(font_style & TextServer::FONT_ITALIC)) {
score += 30;
}
if (score >= best_score) {
best_score = score;
best_match = face_idx;
}
if (best_score == 70) {
break;
}
}
if (best_match != -1) {
gl.font_rid = sysf_cache.var[best_match].rid;
}
}
if (!gl.font_rid.is_valid()) {
if (system_fonts.has(key)) {
const SystemFontCache &sysf_cache = system_fonts[key];
if (sysf_cache.max_var == sysf_cache.var.size()) {
// All subfonts already tested, skip.
continue;
}
}
if (!system_font_data.has(E)) {
system_font_data[E] = FileAccess::get_file_as_bytes(E);
}
const PackedByteArray &font_data = system_font_data[E];
SystemFontCacheRec sysf;
sysf.rid = _create_font();
_font_set_data_ptr(sysf.rid, font_data.ptr(), font_data.size());
Dictionary var = dvar;
// Select matching style from collection.
int best_score = 0;
int best_match = -1;
for (int face_idx = 0; face_idx < _font_get_face_count(sysf.rid); face_idx++) {
_font_set_face_index(sysf.rid, face_idx);
if (unlikely(!_font_has_char(sysf.rid, text[0]))) {
continue;
}
BitField<FontStyle> style = _font_get_style(sysf.rid);
int weight = _font_get_weight(sysf.rid);
int stretch = _font_get_stretch(sysf.rid);
int score = (20 - Math::abs(weight - font_weight) / 50);
score += (20 - Math::abs(stretch - font_stretch) / 10);
if (bool(style & TextServer::FONT_ITALIC) == bool(font_style & TextServer::FONT_ITALIC)) {
score += 30;
}
if (score >= best_score) {
best_score = score;
best_match = face_idx;
}
if (best_score == 70) {
break;
}
}
if (best_match == -1) {
_free_rid(sysf.rid);
continue;
} else {
_font_set_face_index(sysf.rid, best_match);
}
sysf.index = best_match;
// If it's a variable font, apply weight, stretch and italic coordinates to match requested style.
if (best_score != 70) {
Dictionary ftr = _font_supported_variation_list(sysf.rid);
if (ftr.has(wdth_tag)) {
var[wdth_tag] = font_stretch;
_font_set_stretch(sysf.rid, font_stretch);
}
if (ftr.has(wgth_tag)) {
var[wgth_tag] = font_weight;
_font_set_weight(sysf.rid, font_weight);
}
if ((font_style & TextServer::FONT_ITALIC) && ftr.has(ital_tag)) {
var[ital_tag] = 1;
_font_set_style(sysf.rid, _font_get_style(sysf.rid) | TextServer::FONT_ITALIC);
}
}
_font_set_antialiasing(sysf.rid, key.antialiasing);
_font_set_generate_mipmaps(sysf.rid, key.mipmaps);
_font_set_multichannel_signed_distance_field(sysf.rid, key.msdf);
_font_set_msdf_pixel_range(sysf.rid, key.msdf_range);
_font_set_msdf_size(sysf.rid, key.msdf_source_size);
_font_set_fixed_size(sysf.rid, key.fixed_size);
_font_set_force_autohinter(sysf.rid, key.force_autohinter);
_font_set_hinting(sysf.rid, key.hinting);
_font_set_subpixel_positioning(sysf.rid, key.subpixel_positioning);
_font_set_variation_coordinates(sysf.rid, var);
_font_set_oversampling(sysf.rid, key.oversampling);
_font_set_embolden(sysf.rid, key.embolden);
_font_set_transform(sysf.rid, key.transform);
if (system_fonts.has(key)) {
system_fonts[key].var.push_back(sysf);
} else {
SystemFontCache &sysf_cache = system_fonts[key];
sysf_cache.max_var = _font_get_face_count(sysf.rid);
sysf_cache.var.push_back(sysf);
}
gl.font_rid = sysf.rid;
}
break;
}
}
}
prev_font = gl.font_rid;
double scale = _font_get_scale(gl.font_rid, gl.font_size);
if (gl.font_rid.is_valid()) {
@@ -3893,6 +4121,17 @@ TextServerFallback::TextServerFallback() {
_insert_feature_sets();
};
void TextServerFallback::_cleanup() {
for (const KeyValue<SystemFontKey, SystemFontCache> &E : system_fonts) {
const Vector<SystemFontCacheRec> &sysf_cache = E.value.var;
for (const SystemFontCacheRec &F : sysf_cache) {
_free_rid(F.rid);
}
}
system_fonts.clear();
system_font_data.clear();
}
TextServerFallback::~TextServerFallback() {
#ifdef MODULE_FREETYPE_ENABLED
if (ft_library != nullptr) {