minetest/src/client/fontengine.cpp

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/*
Minetest
Copyright (C) 2010-2014 sapier <sapier at gmx dot net>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
This program 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
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#include "fontengine.h"
#include <cmath>
#include "client/renderingengine.h"
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#include "config.h"
#include "porting.h"
#include "filesys.h"
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#include "gettext.h"
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#if USE_FREETYPE
#include "irrlicht_changes/CGUITTFont.h"
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#endif
/** maximum size distance for getting a "similar" font size */
#define MAX_FONT_SIZE_OFFSET 10
/** reference to access font engine, has to be initialized by main */
FontEngine* g_fontengine = NULL;
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/** callback to be used on change of font size setting */
static void font_setting_changed(const std::string &name, void *userdata)
{
g_fontengine->readSettings();
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}
/******************************************************************************/
FontEngine::FontEngine(gui::IGUIEnvironment* env) :
m_env(env)
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{
for (u32 &i : m_default_size) {
i = (FontMode) FONT_SIZE_UNSPECIFIED;
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}
assert(g_settings != NULL); // pre-condition
assert(m_env != NULL); // pre-condition
assert(m_env->getSkin() != NULL); // pre-condition
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readSettings();
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if (m_currentMode != FM_Simple) {
g_settings->registerChangedCallback("font_size", font_setting_changed, NULL);
g_settings->registerChangedCallback("font_bold", font_setting_changed, NULL);
g_settings->registerChangedCallback("font_italic", font_setting_changed, NULL);
g_settings->registerChangedCallback("font_path", font_setting_changed, NULL);
g_settings->registerChangedCallback("font_path_bold", font_setting_changed, NULL);
g_settings->registerChangedCallback("font_path_italic", font_setting_changed, NULL);
g_settings->registerChangedCallback("font_path_bolditalic", font_setting_changed, NULL);
g_settings->registerChangedCallback("font_shadow", font_setting_changed, NULL);
g_settings->registerChangedCallback("font_shadow_alpha", font_setting_changed, NULL);
g_settings->registerChangedCallback("fallback_font_path", font_setting_changed, NULL);
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}
g_settings->registerChangedCallback("mono_font_path", font_setting_changed, NULL);
g_settings->registerChangedCallback("mono_font_size", font_setting_changed, NULL);
g_settings->registerChangedCallback("screen_dpi", font_setting_changed, NULL);
g_settings->registerChangedCallback("gui_scaling", font_setting_changed, NULL);
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}
/******************************************************************************/
FontEngine::~FontEngine()
{
cleanCache();
}
/******************************************************************************/
void FontEngine::cleanCache()
{
for (auto &font_cache_it : m_font_cache) {
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for (auto &font_it : font_cache_it) {
font_it.second->drop();
font_it.second = NULL;
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}
font_cache_it.clear();
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}
}
/******************************************************************************/
irr::gui::IGUIFont *FontEngine::getFont(FontSpec spec)
{
return getFont(spec, false);
}
irr::gui::IGUIFont *FontEngine::getFont(FontSpec spec, bool may_fail)
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{
if (spec.mode == FM_Unspecified) {
spec.mode = m_currentMode;
} else if (m_currentMode == FM_Simple) {
// Freetype disabled -> Force simple mode
spec.mode = (spec.mode == FM_Mono ||
spec.mode == FM_SimpleMono) ?
FM_SimpleMono : FM_Simple;
// Support for those could be added, but who cares?
spec.bold = false;
spec.italic = false;
} else if (spec.mode == _FM_Fallback) {
// Fallback font doesn't support these either
spec.bold = false;
spec.italic = false;
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}
// Fallback to default size
if (spec.size == FONT_SIZE_UNSPECIFIED)
spec.size = m_default_size[spec.mode];
const auto &cache = m_font_cache[spec.getHash()];
auto it = cache.find(spec.size);
if (it != cache.end())
return it->second;
// Font does not yet exist
gui::IGUIFont *font = nullptr;
if (spec.mode == FM_Simple || spec.mode == FM_SimpleMono)
font = initSimpleFont(spec);
else
font = initFont(spec);
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if (!font && !may_fail) {
errorstream << "Minetest cannot continue without a valid font. "
"Please correct the 'font_path' setting or install the font "
"file in the proper location." << std::endl;
abort();
}
m_font_cache[spec.getHash()][spec.size] = font;
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return font;
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}
/******************************************************************************/
unsigned int FontEngine::getTextHeight(const FontSpec &spec)
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{
irr::gui::IGUIFont *font = getFont(spec);
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// use current skin font as fallback
if (font == NULL) {
font = m_env->getSkin()->getFont();
}
FATAL_ERROR_IF(font == NULL, "Could not get skin font");
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return font->getDimension(L"Some unimportant example String").Height;
}
/******************************************************************************/
unsigned int FontEngine::getTextWidth(const std::wstring &text, const FontSpec &spec)
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{
irr::gui::IGUIFont *font = getFont(spec);
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// use current skin font as fallback
if (font == NULL) {
font = m_env->getSkin()->getFont();
}
FATAL_ERROR_IF(font == NULL, "Could not get font");
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return font->getDimension(text.c_str()).Width;
}
/** get line height for a specific font (including empty room between lines) */
unsigned int FontEngine::getLineHeight(const FontSpec &spec)
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{
irr::gui::IGUIFont *font = getFont(spec);
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// use current skin font as fallback
if (font == NULL) {
font = m_env->getSkin()->getFont();
}
FATAL_ERROR_IF(font == NULL, "Could not get font");
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return font->getDimension(L"Some unimportant example String").Height
+ font->getKerningHeight();
}
/******************************************************************************/
unsigned int FontEngine::getDefaultFontSize()
{
return m_default_size[m_currentMode];
}
unsigned int FontEngine::getFontSize(FontMode mode)
{
if (m_currentMode == FM_Simple) {
if (mode == FM_Mono || mode == FM_SimpleMono)
return m_default_size[FM_SimpleMono];
else
return m_default_size[FM_Simple];
}
if (mode == FM_Unspecified)
return m_default_size[FM_Standard];
return m_default_size[mode];
}
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/******************************************************************************/
void FontEngine::readSettings()
{
if (USE_FREETYPE && g_settings->getBool("freetype")) {
m_default_size[FM_Standard] = g_settings->getU16("font_size");
m_default_size[_FM_Fallback] = g_settings->getU16("font_size");
m_default_size[FM_Mono] = g_settings->getU16("mono_font_size");
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m_default_bold = g_settings->getBool("font_bold");
m_default_italic = g_settings->getBool("font_italic");
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} else {
m_currentMode = FM_Simple;
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}
m_default_size[FM_Simple] = g_settings->getU16("font_size");
m_default_size[FM_SimpleMono] = g_settings->getU16("mono_font_size");
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cleanCache();
updateFontCache();
updateSkin();
}
/******************************************************************************/
void FontEngine::updateSkin()
{
gui::IGUIFont *font = getFont();
if (font)
m_env->getSkin()->setFont(font);
else
errorstream << "FontEngine: Default font file: " <<
"\n\t\"" << g_settings->get("font_path") << "\"" <<
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"\n\trequired for current screen configuration was not found" <<
" or was invalid file format." <<
"\n\tUsing irrlicht default font." << std::endl;
// If we did fail to create a font our own make irrlicht find a default one
font = m_env->getSkin()->getFont();
FATAL_ERROR_IF(font == NULL, "Could not create/get font");
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u32 text_height = font->getDimension(L"Hello, world!").Height;
infostream << "FontEngine: measured text_height=" << text_height << std::endl;
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}
/******************************************************************************/
void FontEngine::updateFontCache()
{
/* the only font to be initialized is default one,
* all others are re-initialized on demand */
getFont(FONT_SIZE_UNSPECIFIED, FM_Unspecified);
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}
/******************************************************************************/
gui::IGUIFont *FontEngine::initFont(const FontSpec &spec)
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{
assert(spec.mode != FM_Unspecified);
assert(spec.size != FONT_SIZE_UNSPECIFIED);
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std::string setting_prefix = "";
if (spec.mode == FM_Mono)
setting_prefix = "mono_";
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std::string setting_suffix = "";
if (spec.bold)
setting_suffix.append("_bold");
if (spec.italic)
setting_suffix.append("_italic");
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u32 size = std::floor(RenderingEngine::getDisplayDensity() *
g_settings->getFloat("gui_scaling") * spec.size);
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if (size == 0) {
errorstream << "FontEngine: attempt to use font size 0" << std::endl;
errorstream << " display density: " << RenderingEngine::getDisplayDensity() << std::endl;
abort();
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}
u16 font_shadow = 0;
u16 font_shadow_alpha = 0;
g_settings->getU16NoEx(setting_prefix + "font_shadow", font_shadow);
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g_settings->getU16NoEx(setting_prefix + "font_shadow_alpha",
font_shadow_alpha);
std::string path_setting;
if (spec.mode == _FM_Fallback)
path_setting = "fallback_font_path";
else
path_setting = setting_prefix + "font_path" + setting_suffix;
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std::string fallback_settings[] = {
g_settings->get(path_setting),
Settings::getLayer(SL_DEFAULTS)->get(path_setting)
};
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#if USE_FREETYPE
for (const std::string &font_path : fallback_settings) {
gui::CGUITTFont *font = gui::CGUITTFont::createTTFont(m_env,
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font_path.c_str(), size, true, true, font_shadow,
font_shadow_alpha);
if (!font) {
errorstream << "FontEngine: Cannot load '" << font_path <<
"'. Trying to fall back to another path." << std::endl;
continue;
}
if (spec.mode != _FM_Fallback) {
FontSpec spec2(spec);
spec2.mode = _FM_Fallback;
font->setFallback(getFont(spec2, true));
}
return font;
}
#else
errorstream << "FontEngine: Tried to load TTF font but Minetest was"
" compiled without Freetype." << std::endl;
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#endif
return nullptr;
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}
/** initialize a font without freetype */
gui::IGUIFont *FontEngine::initSimpleFont(const FontSpec &spec)
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{
assert(spec.mode == FM_Simple || spec.mode == FM_SimpleMono);
assert(spec.size != FONT_SIZE_UNSPECIFIED);
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const std::string &font_path = g_settings->get(
(spec.mode == FM_SimpleMono) ? "mono_font_path" : "font_path");
size_t pos_dot = font_path.find_last_of('.');
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std::string basename = font_path;
std::string ending = lowercase(font_path.substr(pos_dot));
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if (ending == ".ttf") {
errorstream << "FontEngine: Found font \"" << font_path
<< "\" but freetype is not available." << std::endl;
return nullptr;
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}
if (ending == ".xml" || ending == ".png")
basename = font_path.substr(0, pos_dot);
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u32 size = std::floor(
RenderingEngine::getDisplayDensity() *
g_settings->getFloat("gui_scaling") *
spec.size);
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irr::gui::IGUIFont *font = nullptr;
std::string font_extensions[] = { ".png", ".xml" };
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// Find nearest matching font scale
// Does a "zig-zag motion" (positibe/negative), from 0 to MAX_FONT_SIZE_OFFSET
for (s32 zoffset = 0; zoffset < MAX_FONT_SIZE_OFFSET * 2; zoffset++) {
std::stringstream path;
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// LSB to sign
s32 sign = (zoffset & 1) ? -1 : 1;
s32 offset = zoffset >> 1;
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for (const std::string &ext : font_extensions) {
path.str(""); // Clear
path << basename << "_" << (size + offset * sign) << ext;
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if (!fs::PathExists(path.str()))
continue;
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font = m_env->getFont(path.str().c_str());
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if (font) {
verbosestream << "FontEngine: found font: " << path.str() << std::endl;
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break;
}
}
if (font)
break;
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}
// try name direct
if (font == NULL) {
if (fs::PathExists(font_path)) {
font = m_env->getFont(font_path.c_str());
if (font)
verbosestream << "FontEngine: found font: " << font_path << std::endl;
}
}
return font;
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}