From 37a92b86d13e89d0dcec92be6d23ceced29dbc36 Mon Sep 17 00:00:00 2001
From: scuri <scuri>
Date: Mon, 21 Jun 2010 22:55:10 +0000
Subject: *** empty log message ***

---
 src/ftgl/FTCharToGlyphIndexMap.h | 155 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 155 insertions(+)
 create mode 100644 src/ftgl/FTCharToGlyphIndexMap.h

(limited to 'src/ftgl/FTCharToGlyphIndexMap.h')

diff --git a/src/ftgl/FTCharToGlyphIndexMap.h b/src/ftgl/FTCharToGlyphIndexMap.h
new file mode 100644
index 0000000..3aa10a1
--- /dev/null
+++ b/src/ftgl/FTCharToGlyphIndexMap.h
@@ -0,0 +1,155 @@
+/*
+ * FTGL - OpenGL font library
+ *
+ * Copyright (c) 2001-2004 Henry Maddocks <ftgl@opengl.geek.nz>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef    __FTCharToGlyphIndexMap__
+#define    __FTCharToGlyphIndexMap__
+
+#include <stdlib.h>
+
+#include "FTGL/ftgl.h"
+
+/**
+ * Provides a non-STL alternative to the STL map<unsigned long, unsigned long>
+ * which maps character codes to glyph indices inside FTCharmap.
+ *
+ * Implementation:
+ *   - NumberOfBuckets buckets are considered.
+ *   - Each bucket has BucketSize entries.
+ *   - When the glyph index for the character code C has to be stored, the
+ *     bucket this character belongs to is found using 'C div BucketSize'.
+ *     If this bucket has not been allocated yet, do it now.
+ *     The entry in the bucked is found using 'C mod BucketSize'.
+ *     If it is set to IndexNotFound, then the glyph entry has not been set.
+ *   - Try to mimic the calls made to the STL map API.
+ *
+ * Caveats:
+ *   - The glyph index is now a signed long instead of unsigned long, so
+ *     the special value IndexNotFound (= -1) can be used to specify that the
+ *     glyph index has not been stored yet.
+ */
+class FTCharToGlyphIndexMap
+{
+    public:
+
+        typedef unsigned long CharacterCode;
+        typedef signed long GlyphIndex;
+
+        enum
+        {
+            NumberOfBuckets = 256,
+            BucketSize = 256,
+            IndexNotFound = -1
+        };
+
+        FTCharToGlyphIndexMap()
+        {
+            this->Indices = 0;
+        }
+
+        virtual ~FTCharToGlyphIndexMap()
+        {
+            if(this->Indices)
+            {
+                // Free all buckets
+                this->clear();
+
+                // Free main structure
+                delete [] this->Indices;
+                this->Indices = 0;
+            }
+        }
+
+        void clear()
+        {
+            if(this->Indices)
+            {
+                for(int i = 0; i < FTCharToGlyphIndexMap::NumberOfBuckets; i++)
+                {
+                    if(this->Indices[i])
+                    {
+                        delete [] this->Indices[i];
+                        this->Indices[i] = 0;
+                    }
+                }
+            }
+        }
+
+        const GlyphIndex find(CharacterCode c)
+        {
+            if(!this->Indices)
+            {
+                return 0;
+            }
+
+            // Find position of char code in buckets
+            div_t pos = div(c, FTCharToGlyphIndexMap::BucketSize);
+
+            if(!this->Indices[pos.quot])
+            {
+                return 0;
+            }
+
+            const FTCharToGlyphIndexMap::GlyphIndex *ptr = &this->Indices[pos.quot][pos.rem];
+            if(*ptr == FTCharToGlyphIndexMap::IndexNotFound)
+            {
+                return 0;
+            }
+
+            return *ptr;
+        }
+
+        void insert(CharacterCode c, GlyphIndex g)
+        {
+            if(!this->Indices)
+            {
+                this->Indices = new GlyphIndex* [FTCharToGlyphIndexMap::NumberOfBuckets];
+                for(int i = 0; i < FTCharToGlyphIndexMap::NumberOfBuckets; i++)
+                {
+                    this->Indices[i] = 0;
+                }
+            }
+
+            // Find position of char code in buckets
+            div_t pos = div(c, FTCharToGlyphIndexMap::BucketSize);
+
+            // Allocate bucket if does not exist yet
+            if(!this->Indices[pos.quot])
+            {
+                this->Indices[pos.quot] = new GlyphIndex [FTCharToGlyphIndexMap::BucketSize];
+                for(int i = 0; i < FTCharToGlyphIndexMap::BucketSize; i++)
+                {
+                    this->Indices[pos.quot][i] = FTCharToGlyphIndexMap::IndexNotFound;
+                }
+            }
+
+            this->Indices[pos.quot][pos.rem] = g;
+        }
+
+    private:
+        GlyphIndex** Indices;
+};
+
+
+#endif  //  __FTCharToGlyphIndexMap__
-- 
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