gui2/button: Add definitions for special title screen buttons

These buttons have an icon like normal action buttons do, but they also
keep their text label and use a smaller font. Currently only one
instance is provided, for the Language button.

data/gui/widget/button_title_screen_small.cfg

@@ -0,0 +1,136 @@
+#textdomain wesnoth-lib
+
+#define _GUI_BUTTON_FONT_SIZE
+{GUI_FONT_SIZE_TINY} #enddef
+
+#define _GUI_BUTTON_TEXT FONT_SIZE FONT_STYLE FONT_COLOR
+	[text]
+		x = 30 # 10 px padding left + 20 px image width
+		y = "(max((height - text_height - 2) / 2, 0))"
+		w = "(width - 40)" # 10 px padding right
+		h = "(text_height)"
+		maximum_width = "(width - 40)" # 10 px padding right
+		font_size = {FONT_SIZE}
+		font_style = {FONT_STYLE}
+		color = {FONT_COLOR}
+		text = "(text)"
+		text_markup = "(text_markup)"
+		text_alignment = "right"
+	[/text]
+#enddef
+
+#define _GUI_BUTTON_ICON IMAGE_FILESTEM IPF
+	[image]
+		x = 5
+		y = "(max(pos, 0) where pos = floor((height - image_height) / 2))"
+
+		w = "(min(width,  image_original_width))"
+		h = "(min(height, image_original_height))"
+
+		name = {IMAGE_FILESTEM} + ".png{IPF}"
+	[/image]
+#enddef
+
+#define _GUI_RESOLUTION RESOLUTION MIN_WIDTH DEFAULT_WIDTH HEIGHT EXTRA_WIDTH EXTRA_HEIGHT FONT_SIZE ICON IPF ALPHA
+	[resolution]
+
+		{RESOLUTION}
+
+		min_width = {MIN_WIDTH}
+		min_height = {HEIGHT}
+
+		default_width = {DEFAULT_WIDTH}
+		default_height = {HEIGHT}
+
+		max_width = 0
+		max_height = {HEIGHT}
+
+		text_extra_width = {EXTRA_WIDTH}
+		text_extra_height = {EXTRA_HEIGHT}
+		text_font_size = {FONT_SIZE}
+
+		[state_enabled]
+
+			[draw]
+
+				{GUI__BUTTON_NORMAL_FRAME "buttons/button_normal/background"
+					({GUI__BORDER_COLOR      ALPHA={ALPHA}})
+					({GUI__BORDER_COLOR_DARK ALPHA={ALPHA}}) ("21, 79, 109, 255") {IPF}}
+
+				{_GUI_BUTTON_ICON {ICON} {IPF}}
+
+				{_GUI_BUTTON_TEXT ({FONT_SIZE}) () ({GUI__FONT_COLOR_ENABLED__TITLE})}
+
+			[/draw]
+
+		[/state_enabled]
+
+		[state_disabled]
+
+			[draw]
+
+				{GUI__BUTTON_NORMAL_FRAME "buttons/button_normal/background"
+					({GUI__FONT_COLOR_DISABLED__DEFAULT ALPHA={ALPHA}})
+					("89,  89,  89,  {ALPHA}")
+					("60,  60,  60, 255") "~GS(){IPF}"}
+
+				{_GUI_BUTTON_ICON {ICON} "~GS(){IPF}"}
+
+				{_GUI_BUTTON_TEXT ({FONT_SIZE}) () ({GUI__FONT_COLOR_DISABLED__TITLE})}
+
+			[/draw]
+
+		[/state_disabled]
+
+		[state_pressed]
+
+			[draw]
+
+				{GUI__BUTTON_NORMAL_FRAME "buttons/button_normal/background-pressed"
+					({GUI__BORDER_COLOR      ALPHA={ALPHA}})
+					({GUI__BORDER_COLOR_DARK ALPHA={ALPHA}}) ("1, 10, 16, 255") {IPF}}
+
+				{_GUI_BUTTON_ICON {ICON}-pressed {IPF}}
+
+				{_GUI_BUTTON_TEXT ({FONT_SIZE}) () ({GUI__FONT_COLOR_ENABLED__TITLE})}
+
+			[/draw]
+
+		[/state_pressed]
+
+		[state_focused]
+
+			[draw]
+
+				{GUI__BUTTON_NORMAL_FRAME "buttons/button_normal/background-active"
+					({GUI__BORDER_COLOR      ALPHA={ALPHA}})
+					({GUI__BORDER_COLOR_DARK ALPHA={ALPHA}}) ("12, 108, 157, 255") {IPF}}
+
+				{_GUI_BUTTON_ICON {ICON}-active {IPF}}
+
+				{_GUI_BUTTON_TEXT ({FONT_SIZE}) () ({GUI__FONT_COLOR_ENABLED__TITLE})}
+
+			[/draw]
+
+		[/state_focused]
+
+	[/resolution]
+#enddef
+
+[button_definition]
+
+	id = "titlescreen_language"
+	description = "Language button used on the main menu."
+
+	{_GUI_RESOLUTION () 40 80 16 43 14 ({_GUI_BUTTON_FONT_SIZE}) icons/action/language_25 () 255}
+	{_GUI_RESOLUTION ({GUI_BIG_RESOLUTION})
+			 50 80 20 46 16
+			 ({GUI_SCALE_RESOLUTION {_GUI_BUTTON_FONT_SIZE}})
+			 icons/action/language_25 () 255}
+
+[/button_definition]
+
+#undef _GUI_RESOLUTION
+#undef _GUI_BUTTON_ICON
+#undef _GUI_BUTTON_TEXT
+#undef _GUI_BUTTON_FONT_SIZE