From 4824cb78863ff8b5ff631631a1fd8b5c8dfba500 Mon Sep 17 00:00:00 2001
From: frosch <frosch@openttd.org>
Date: Sat, 6 Jul 2013 18:56:23 +0000
Subject: [PATCH] (svn r25569) -Codechange: Cache all Font instances in a
 static container.

---
 src/fontcache.cpp  |  3 +++
 src/gfx_layout.cpp | 46 ++++++++++++++++++++++++++++++++--------------
 src/gfx_layout.h   |  8 ++++++--
 3 files changed, 41 insertions(+), 16 deletions(-)

diff --git a/src/fontcache.cpp b/src/fontcache.cpp
index b51cecaf6c..9e0fd1e166 100644
--- a/src/fontcache.cpp
+++ b/src/fontcache.cpp
@@ -17,6 +17,7 @@
 #include "core/smallmap_type.hpp"
 #include "strings_func.h"
 #include "zoom_type.h"
+#include "gfx_layout.h"
 
 #include "table/sprites.h"
 #include "table/control_codes.h"
@@ -39,6 +40,7 @@ FontCache::FontCache(FontSize fs) : parent(FontCache::Get(fs)), fs(fs), height(_
 {
 	assert(parent == NULL || this->fs == parent->fs);
 	FontCache::caches[this->fs] = this;
+	Layouter::ResetFontCache(this->fs);
 }
 
 /** Clean everything up. */
@@ -46,6 +48,7 @@ FontCache::~FontCache()
 {
 	assert(this->fs == parent->fs);
 	FontCache::caches[this->fs] = this->parent;
+	Layouter::ResetFontCache(this->fs);
 }
 
 
diff --git a/src/gfx_layout.cpp b/src/gfx_layout.cpp
index f3b1ac1d3a..cba5a7ddd9 100644
--- a/src/gfx_layout.cpp
+++ b/src/gfx_layout.cpp
@@ -20,6 +20,11 @@
 #include <unicode/ustring.h>
 #endif /* WITH_ICU */
 
+
+/** Cache of Font instances. */
+Layouter::FontColourMap Layouter::fonts[FS_END];
+
+
 /**
  * Construct a new font.
  * @param size   The font size to use for this font.
@@ -414,7 +419,7 @@ Layouter::Layouter(const char *str, int maxw, TextColour colour, FontSize fontsi
 	WChar c = 0;
 
 	do {
-		Font *f = new Font(state.fontsize, state.cur_colour);
+		Font *f = GetFont(state.fontsize, state.cur_colour);
 		CharType *buff_begin = buff;
 		FontMap fontMapping;
 
@@ -442,11 +447,8 @@ Layouter::Layouter(const char *str, int maxw, TextColour colour, FontSize fontsi
 
 			if (!fontMapping.Contains(buff - buff_begin)) {
 				fontMapping.Insert(buff - buff_begin, f);
-				*this->fonts.Append() = f;
-			} else {
-				delete f;
 			}
-			f = new Font(state.fontsize, state.cur_colour);
+			f = GetFont(state.fontsize, state.cur_colour);
 		}
 
 		/* Better safe than sorry. */
@@ -454,7 +456,6 @@ Layouter::Layouter(const char *str, int maxw, TextColour colour, FontSize fontsi
 
 		if (!fontMapping.Contains(buff - buff_begin)) {
 			fontMapping.Insert(buff - buff_begin, f);
-			*this->fonts.Append() = f;
 		}
 		ParagraphLayout *p = GetParagraphLayout(buff_begin, buff, fontMapping);
 
@@ -469,14 +470,6 @@ Layouter::Layouter(const char *str, int maxw, TextColour colour, FontSize fontsi
 	} while (c != '\0' && buff < buffer_last);
 }
 
-/** Free everything we allocated. */
-Layouter::~Layouter()
-{
-	for (Font **iter = this->fonts.Begin(); iter != this->fonts.End(); iter++) {
-		delete *iter;
-	}
-}
-
 /**
  * Get the boundaries of this paragraph.
  * @return The boundaries.
@@ -490,3 +483,28 @@ Dimension Layouter::GetBounds()
 	}
 	return d;
 }
+
+/**
+ * Get a static font instance.
+ */
+Font *Layouter::GetFont(FontSize size, TextColour colour)
+{
+	FontColourMap::iterator it = fonts[size].Find(colour);
+	if (it != fonts[size].End()) return it->second;
+
+	Font *f = new Font(size, colour);
+	*fonts[size].Append() = FontColourMap::Pair(colour, f);
+	return f;
+}
+
+/**
+ * Reset cached font information.
+ * @param size Font size to reset.
+ */
+void Layouter::ResetFontCache(FontSize size)
+{
+	for (FontColourMap::iterator it = fonts[size].Begin(); it != fonts[size].End(); ++it) {
+		delete it->second;
+	}
+	fonts[size].Clear();
+}
diff --git a/src/gfx_layout.h b/src/gfx_layout.h
index 6dbf3f872f..ea9c34aae3 100644
--- a/src/gfx_layout.h
+++ b/src/gfx_layout.h
@@ -167,12 +167,16 @@ class Layouter : public AutoDeleteSmallVector<ParagraphLayout::Line *, 4> {
 	ParagraphLayout *GetParagraphLayout(CharType *buff, CharType *buff_end, FontMap &fontMapping);
 
 	CharType buffer[DRAW_STRING_BUFFER]; ///< Buffer for the text that is going to be drawn.
-	SmallVector<Font *, 4> fonts;        ///< The fonts needed for drawing.
+
+	typedef SmallMap<TextColour, Font *> FontColourMap;
+	static FontColourMap fonts[FS_END];
+	static Font *GetFont(FontSize size, TextColour colour);
 
 public:
 	Layouter(const char *str, int maxw = INT32_MAX, TextColour colour = TC_FROMSTRING, FontSize fontsize = FS_NORMAL);
-	~Layouter();
 	Dimension GetBounds();
+
+	static void ResetFontCache(FontSize size);
 };
 
 #endif /* GFX_LAYOUT_H */