Add FormSpec font styling options (#9763)

* Add FormSpec font styling options

* Change multiplication to stof

* Remove extraneous check

doc/lua_api.txt

@@ -2747,6 +2747,18 @@ Some types may inherit styles from parent types.
                      button's content when set.
     * bgimg_pressed - background image when pressed. Defaults to bgimg when not provided.
         * This is deprecated, use states instead.
+    * font - Sets font type. This is a comma separated list of options. Valid options:
+      * Main font type options. These cannot be combined with each other:
+        * `normal`: Default font
+        * `mono`: Monospaced font
+      * Font modification options. If used without a main font type, `normal` is used:
+        * `bold`: Makes font bold.
+        * `italic`: Makes font italic.
+      Default `normal`.
+    * font_size - Sets font size. Default is user-set. Can have multiple values:
+      * `<number>`: Sets absolute font size to `number`.
+      * `+<number>`/`-<number>`: Offsets default font size by `number` points.
+      * `*<number>`: Multiplies default font size by `number`, similar to CSS `em`.
     * border - boolean, draw border. Set to false to hide the bevelled button pane. Default true.
     * content_offset - 2d vector, shifts the position of the button's content without resizing it.
     * noclip - boolean, set to true to allow the element to exceed formspec bounds.
@@ -2758,11 +2770,15 @@ Some types may inherit styles from parent types.
 * scrollbar
     * noclip - boolean, set to true to allow the element to exceed formspec bounds.
 * table, textlist
+    * font - Sets font type. See button `font` property for more information.
+    * font_size - Sets font size. See button `font_size` property for more information.
     * noclip - boolean, set to true to allow the element to exceed formspec bounds.
 * dropdown
     * noclip - boolean, set to true to allow the element to exceed formspec bounds.
 * field, pwdfield, textarea
     * border - set to false to hide the textbox background and border. Default true.
+    * font - Sets font type. See button `font` property for more information.
+    * font_size - Sets font size. See button `font_size` property for more information.
     * noclip - boolean, set to true to allow the element to exceed formspec bounds.
     * textcolor - color. Default white.
 * image
@@ -2771,6 +2787,8 @@ Some types may inherit styles from parent types.
 * item_image
     * noclip - boolean, set to true to allow the element to exceed formspec bounds. Default to false.
 * label, vertlabel
+    * font - Sets font type. See button `font` property for more information.
+    * font_size - Sets font size. See button `font_size` property for more information.
     * noclip - boolean, set to true to allow the element to exceed formspec bounds.
 * image_button (additional properties)
     * fgimg - standard image. Defaults to none.

src/client/fontengine.cpp

@@ -186,6 +186,21 @@ 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];
+}
+
 /******************************************************************************/
 void FontEngine::readSettings()
 {

src/client/fontengine.h

@@ -124,6 +124,9 @@ public:
 	/** get default font size */
 	unsigned int getDefaultFontSize();
 
+	/** get font size for a specific mode */
+	unsigned int getFontSize(FontMode mode);
+
 	/** initialize font engine */
 	void initialize(Settings* main_settings, gui::IGUIEnvironment* env);
 

src/gui/StyleSpec.h

@@ -18,9 +18,11 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 */
 
 #include "client/tile.h" // ITextureSource
+#include "client/fontengine.h"
 #include "debug.h"
 #include "irrlichttypes_extrabloated.h"
 #include "util/string.h"
+#include <algorithm>
 #include <array>
 
 #pragma once
@@ -46,6 +48,8 @@ public:
 		ALPHA,
 		CONTENT_OFFSET,
 		PADDING,
+		FONT,
+		FONT_SIZE,
 		NUM_PROPERTIES,
 		NONE
 	};
@@ -98,6 +102,10 @@ public:
 			return CONTENT_OFFSET;
 		} else if (name == "padding") {
 			return PADDING;
+		} else if (name == "font") {
+			return FONT;
+		} else if (name == "font_size") {
+			return FONT_SIZE;
 		} else {
 			return NONE;
 		}
@@ -225,6 +233,47 @@ public:
 		return vec;
 	}
 
+	gui::IGUIFont *getFont() const
+	{
+		FontSpec spec(FONT_SIZE_UNSPECIFIED, FM_Standard, false, false);
+
+		const std::string &font = properties[FONT];
+		const std::string &size = properties[FONT_SIZE];
+
+		if (font.empty() && size.empty())
+			return nullptr;
+
+		std::vector<std::string> modes = split(font, ',');
+
+		for (size_t i = 0; i < modes.size(); i++) {
+			if (modes[i] == "normal")
+				spec.mode = FM_Standard;
+			else if (modes[i] == "mono")
+				spec.mode = FM_Mono;
+			else if (modes[i] == "bold")
+				spec.bold = true;
+			else if (modes[i] == "italic")
+				spec.italic = true;
+		}
+
+		if (!size.empty()) {
+			int calc_size = 1;
+
+			if (size[0] == '*') {
+				std::string new_size = size.substr(1); // Remove '*' (invalid for stof)
+				calc_size = stof(new_size) * g_fontengine->getFontSize(spec.mode);
+			} else if (size[0] == '+' || size[0] == '-') {
+				calc_size = stoi(size) + g_fontengine->getFontSize(spec.mode);
+			} else {
+				calc_size = stoi(size);
+			}
+
+			spec.size = (unsigned)std::min(std::max(calc_size, 1), 999);
+		}
+
+		return g_fontengine->getFont(spec);
+	}
+
 	video::ITexture *getTexture(Property prop, ISimpleTextureSource *tsrc,
 			video::ITexture *def) const
 	{

src/gui/guiButton.cpp

@@ -788,6 +788,7 @@ void GUIButton::setFromStyle(const StyleSpec& style)
 	setNotClipped(style.getBool(StyleSpec::NOCLIP, false));
 	setDrawBorder(style.getBool(StyleSpec::BORDER, true));
 	setUseAlphaChannel(style.getBool(StyleSpec::ALPHA, true));
+	setOverrideFont(style.getFont());
 
 	if (style.isNotDefault(StyleSpec::BGIMG)) {
 		video::ITexture *texture = style.getTexture(StyleSpec::BGIMG,

src/gui/guiFormSpecMenu.cpp

@@ -24,8 +24,6 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include <limits>
 #include <sstream>
 #include "guiFormSpecMenu.h"
-#include "guiScrollBar.h"
-#include "guiTable.h"
 #include "constants.h"
 #include "gamedef.h"
 #include "client/keycode.h"
@@ -64,9 +62,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "guiEditBoxWithScrollbar.h"
 #include "guiInventoryList.h"
 #include "guiItemImage.h"
-#include "guiScrollBar.h"
 #include "guiScrollContainer.h"
-#include "guiTable.h"
 #include "intlGUIEditBox.h"
 #include "guiHyperText.h"
 
@@ -1482,6 +1478,7 @@ void GUIFormSpecMenu::parsePwdField(parserData* data, const std::string &element
 		e->setNotClipped(style.getBool(StyleSpec::NOCLIP, false));
 		e->setDrawBorder(style.getBool(StyleSpec::BORDER, true));
 		e->setOverrideColor(style.getColor(StyleSpec::TEXTCOLOR, video::SColor(0xFFFFFFFF)));
+		e->setOverrideFont(style.getFont());
 
 		irr::SEvent evt;
 		evt.EventType            = EET_KEY_INPUT_EVENT;
@@ -1565,6 +1562,7 @@ void GUIFormSpecMenu::createTextField(parserData *data, FieldSpec &spec,
 		if (style.get(StyleSpec::BGCOLOR, "") == "transparent") {
 			e->setDrawBackground(false);
 		}
+		e->setOverrideFont(style.getFont());
 
 		e->drop();
 	}
@@ -1778,6 +1776,11 @@ void GUIFormSpecMenu::parseLabel(parserData* data, const std::string &element)
 
 		std::vector<std::string> lines = split(text, '\n');
 
+		auto style = getDefaultStyleForElement("label", "");
+		gui::IGUIFont *font = style.getFont();
+		if (!font)
+			font = m_font;
+
 		for (unsigned int i = 0; i != lines.size(); i++) {
 			std::wstring wlabel_colors = translate_string(
 				utf8_to_wide(unescape_string(lines[i])));
@@ -1799,7 +1802,7 @@ void GUIFormSpecMenu::parseLabel(parserData* data, const std::string &element)
 
 				rect = core::rect<s32>(
 					pos.X, pos.Y,
-					pos.X + m_font->getDimension(wlabel_plain.c_str()).Width,
+					pos.X + font->getDimension(wlabel_plain.c_str()).Width,
 					pos.Y + imgsize.Y);
 
 			} else {
@@ -1821,7 +1824,7 @@ void GUIFormSpecMenu::parseLabel(parserData* data, const std::string &element)
 
 				rect = core::rect<s32>(
 					pos.X, pos.Y - m_btn_height,
-					pos.X + m_font->getDimension(wlabel_plain.c_str()).Width,
+					pos.X + font->getDimension(wlabel_plain.c_str()).Width,
 					pos.Y + m_btn_height);
 			}
 
@@ -1837,9 +1840,9 @@ void GUIFormSpecMenu::parseLabel(parserData* data, const std::string &element)
 					spec.fid);
 			e->setTextAlignment(gui::EGUIA_UPPERLEFT, gui::EGUIA_CENTER);
 
-			auto style = getDefaultStyleForElement("label", spec.fname);
 			e->setNotClipped(style.getBool(StyleSpec::NOCLIP, false));
 			e->setOverrideColor(style.getColor(StyleSpec::TEXTCOLOR, video::SColor(0xFFFFFFFF)));
+			e->setOverrideFont(font);
 
 			m_fields.push_back(spec);
 
@@ -1867,6 +1870,11 @@ void GUIFormSpecMenu::parseVertLabel(parserData* data, const std::string &elemen
 
 		MY_CHECKPOS("vertlabel",1);
 
+		auto style = getDefaultStyleForElement("vertlabel", "", "label");
+		gui::IGUIFont *font = style.getFont();
+		if (!font)
+			font = m_font;
+
 		v2s32 pos;
 		core::rect<s32> rect;
 
@@ -1880,7 +1888,7 @@ void GUIFormSpecMenu::parseVertLabel(parserData* data, const std::string &elemen
 			// isn't quite tall enough and cuts off the text.
 			rect = core::rect<s32>(pos.X, pos.Y,
 				pos.X + imgsize.X,
-				pos.Y + font_line_height(m_font) *
+				pos.Y + font_line_height(font) *
 				(text.length() + 1));
 
 		} else {
@@ -1892,7 +1900,7 @@ void GUIFormSpecMenu::parseVertLabel(parserData* data, const std::string &elemen
 			rect = core::rect<s32>(
 				pos.X, pos.Y+((imgsize.Y/2) - m_btn_height),
 				pos.X+15, pos.Y +
-					font_line_height(m_font) *
+					font_line_height(font) *
 					(text.length() + 1) +
 					((imgsize.Y/2) - m_btn_height));
 		}
@@ -1917,9 +1925,9 @@ void GUIFormSpecMenu::parseVertLabel(parserData* data, const std::string &elemen
 				rect, false, false, data->current_parent, spec.fid);
 		e->setTextAlignment(gui::EGUIA_CENTER, gui::EGUIA_CENTER);
 
-		auto style = getDefaultStyleForElement("vertlabel", spec.fname, "label");
 		e->setNotClipped(style.getBool(StyleSpec::NOCLIP, false));
 		e->setOverrideColor(style.getColor(StyleSpec::TEXTCOLOR, video::SColor(0xFFFFFFFF)));
+		e->setOverrideFont(font);
 
 		m_fields.push_back(spec);
 

src/gui/guiFormSpecMenu.h

@@ -27,6 +27,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "inventorymanager.h"
 #include "modalMenu.h"
 #include "guiInventoryList.h"
+#include "guiScrollBar.h"
 #include "guiTable.h"
 #include "network/networkprotocol.h"
 #include "client/joystick_controller.h"
@@ -37,7 +38,6 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 class InventoryManager;
 class ISimpleTextureSource;
 class Client;
-class GUIScrollBar;
 class TexturePool;
 class GUIScrollContainer;