From b1bbc998960fff2169dc5a992c47d08723472f9b Mon Sep 17 00:00:00 2001
From: chai <chaifix@163.com>
Date: Sun, 14 Oct 2018 22:52:40 +0800
Subject: =?UTF-8?q?*=E7=9B=B4=E6=8E=A5=E6=B8=B2=E6=9F=93=E5=AD=97=E7=AC=A6?=
 =?UTF-8?q?=E4=B8=B2?=
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---
 src/libjin/Graphics/Font/Decoder.cpp | 93 ++++++++++++++++++++++++++++++++++++
 1 file changed, 93 insertions(+)
 create mode 100644 src/libjin/Graphics/Font/Decoder.cpp

(limited to 'src/libjin/Graphics/Font/Decoder.cpp')

diff --git a/src/libjin/Graphics/Font/Decoder.cpp b/src/libjin/Graphics/Font/Decoder.cpp
new file mode 100644
index 0000000..10927f0
--- /dev/null
+++ b/src/libjin/Graphics/Font/Decoder.cpp
@@ -0,0 +1,93 @@
+#include <stdlib.h>
+#include <string.h>
+#include "Decoder.h"
+
+namespace jin
+{
+namespace graphics
+{
+
+    /* utf8 byte string to unicode codepoint */
+    static const char *utf8toCodepoint(const char *p, unsigned *res) {
+		return nullptr;
+
+    }
+
+    /////////////////////////////////////////////////////////////////////////////
+    // decoders
+    /////////////////////////////////////////////////////////////////////////////
+
+    const void* Utf8::decode(const void* data, Codepoint* res) const
+    {
+        const char* p = (char*)data;
+        unsigned x, mask, shift;
+        switch (*p & 0xf0) {
+        case 0xf0:  mask = 0x07;  shift = 18;   break;
+        case 0xe0:  mask = 0x0f;  shift = 12;   break;
+        case 0xc0:
+        case 0xd0:  mask = 0x1f;  shift = 6;   break;
+        default:
+            *res = *p;
+            return p + 1;
+        }
+        x = (*p & mask) << shift;
+        do {
+            if (*(++p) == '\0') {
+                *res = x;
+                return p;
+            }
+            shift -= 6;
+            x |= (*p & 0x3f) << shift;
+        } while (shift);
+        *res = x;
+        return p + 1;
+    }
+
+	const void* Utf8::next(const void* data) const
+	{
+		const char* p = (char*)data;
+		unsigned x, mask, shift;
+		switch (*p & 0xf0) {
+		case 0xf0:  mask = 0x07;  shift = 18;   break;
+		case 0xe0:  mask = 0x0f;  shift = 12;   break;
+		case 0xc0:
+		case 0xd0:  mask = 0x1f;  shift = 6;   break;
+		default:
+			return p + 1;
+		}
+		x = (*p & mask) << shift;
+		do {
+			if (*(++p) == '\0') {
+				return p;
+			}
+			shift -= 6;
+			x |= (*p & 0x3f) << shift;
+		} while (shift);
+		return p + 1;
+	}
+/*
+	const void* Utf16::decode(const void* data, Codepoint* res) const
+	{
+		return nullptr;
+	}
+
+	const void* Utf16::next(const void* data) const
+	{
+		return nullptr;
+	}
+*/
+	const void* Ascii::decode(const void* data, Codepoint* res) const
+	{
+		const char* p = (char*)data;
+		*res = *p;
+		return p + 1;
+	}
+
+	const void* Ascii::next(const void* data) const
+	{
+		const char* p = (char*)data;
+		return p + 1;
+	}
+
+} // graphics
+} // jin
\ No newline at end of file
-- 
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