ICU-8.11.tar.gz

[apple/icu.git] / icuSources / layout / KhmerLayoutEngine.cpp

diff --git a/icuSources/layout/KhmerLayoutEngine.cpp b/icuSources/layout/KhmerLayoutEngine.cpp
new file mode 100644 (file)
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+++ b/icuSources/layout/KhmerLayoutEngine.cpp
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+
+/*
+ * (C) Copyright IBM Corp. 1998-2005 - All Rights Reserved 
+ *
+ * This file is a modification of the ICU file IndicLayoutEngine.cpp
+ * by Jens Herden and Javier Sola for Khmer language 
+ *
+ */
+
+
+#include "OpenTypeLayoutEngine.h"
+#include "KhmerLayoutEngine.h"
+#include "LEGlyphStorage.h"
+#include "KhmerReordering.h"
+
+U_NAMESPACE_BEGIN
+
+UOBJECT_DEFINE_RTTI_IMPLEMENTATION(KhmerOpenTypeLayoutEngine)
+
+KhmerOpenTypeLayoutEngine::KhmerOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode,
+                    le_int32 typoFlags, const GlyphSubstitutionTableHeader *gsubTable)
+    : OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, gsubTable)
+{
+    fFeatureMap   = KhmerReordering::getFeatureMap(fFeatureMapCount);
+    fFeatureOrder = TRUE;
+}
+
+KhmerOpenTypeLayoutEngine::KhmerOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode,
+                                                    le_int32 typoFlags)
+    : OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags)
+{
+    fFeatureMap   = KhmerReordering::getFeatureMap(fFeatureMapCount);
+    fFeatureOrder = TRUE;
+}
+
+KhmerOpenTypeLayoutEngine::~KhmerOpenTypeLayoutEngine()
+{
+    // nothing to do
+}
+
+// Input: characters
+// Output: characters, char indices, tags
+// Returns: output character count
+le_int32 KhmerOpenTypeLayoutEngine::characterProcessing(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft,
+        LEUnicode *&outChars, LEGlyphStorage &glyphStorage, LEErrorCode &success)
+{
+    if (LE_FAILURE(success)) {
+        return 0;
+    }
+
+    if (chars == NULL || offset < 0 || count < 0 || max < 0 || offset >= max || offset + count > max) {
+        success = LE_ILLEGAL_ARGUMENT_ERROR;
+        return 0;
+    }
+
+    le_int32 worstCase = count * 3;  // worst case is 3 for Khmer  TODO check if 2 is enough
+
+    outChars = LE_NEW_ARRAY(LEUnicode, worstCase);
+
+    if (outChars == NULL) {
+        success = LE_MEMORY_ALLOCATION_ERROR;
+        return 0;
+    }
+
+    glyphStorage.allocateGlyphArray(worstCase, rightToLeft, success);
+    glyphStorage.allocateAuxData(success);
+
+    if (LE_FAILURE(success)) {
+        LE_DELETE_ARRAY(outChars);
+        return 0;
+    }
+
+    // NOTE: assumes this allocates featureTags...
+    // (probably better than doing the worst case stuff here...)
+    le_int32 outCharCount = KhmerReordering::reorder(&chars[offset], count, fScriptCode, outChars, glyphStorage);
+
+    glyphStorage.adoptGlyphCount(outCharCount);
+    return outCharCount;
+}
+
+U_NAMESPACE_END