ICU-57132.0.1.tar.gz

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

diff --git a/icuSources/layout/ThaiLayoutEngine.cpp b/icuSources/layout/ThaiLayoutEngine.cpp
index 9b808fd1ee5a104b6adf00f9e5318f1fe8378bb7..3cfb09e4a9d976f9c55a29e99138a7dc6683618f 100644 (file)
--- a/icuSources/layout/ThaiLayoutEngine.cpp
+++ b/icuSources/layout/ThaiLayoutEngine.cpp
@@ -1,8 +1,7 @@
 
 /*
- * @(#)ThaiLayoutEngine.cpp    1.2 00/03/15
  *
- * (C) Copyright IBM Corp. 1998-2003 - All Rights Reserved
+ * (C) Copyright IBM Corp. 1998-2013 - All Rights Reserved
  *
  */
 
@@ -10,20 +9,26 @@
 #include "LayoutEngine.h"
 #include "ThaiLayoutEngine.h"
 #include "ScriptAndLanguageTags.h"
+#include "LEGlyphStorage.h"
+
+#include "KernTable.h"
 
 #include "ThaiShaping.h"
 
 U_NAMESPACE_BEGIN
 
-const char ThaiLayoutEngine::fgClassID=0;
+UOBJECT_DEFINE_RTTI_IMPLEMENTATION(ThaiLayoutEngine)
 
-ThaiLayoutEngine::ThaiLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode)
-    : LayoutEngine(fontInstance, scriptCode, languageCode)
+ThaiLayoutEngine::ThaiLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode, le_int32 typoFlags, LEErrorCode &success)
+    : LayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, success)
 {
     fErrorChar = 0x25CC;
 
     // Figure out which presentation forms the font uses
-    if (fontInstance->canDisplay(0x0E64)) {
+    if (! fontInstance->canDisplay(0x0E01)) {
+        // No Thai in font; don't use presentation forms.
+        fGlyphSet = 3;
+    } else if (fontInstance->canDisplay(0x0E64)) {
         // WorldType uses reserved space in Thai block
         fGlyphSet = 0;
     } else if (fontInstance->canDisplay(0xF701)) {
@@ -51,7 +56,7 @@ ThaiLayoutEngine::~ThaiLayoutEngine()
 // Output: glyphs, char indices
 // Returns: the glyph count
 // NOTE: this assumes that ThaiShaping::compose will allocate the outChars array...
-le_int32 ThaiLayoutEngine::computeGlyphs(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool /*rightToLeft*/, LEGlyphID *&glyphs, le_int32 *&charIndices, LEErrorCode &success)
+le_int32 ThaiLayoutEngine::computeGlyphs(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool /*rightToLeft*/, LEGlyphStorage &glyphStorage, LEErrorCode &success)
 {
     if (LE_FAILURE(success)) {
         return 0;
@@ -74,20 +79,44 @@ le_int32 ThaiLayoutEngine::computeGlyphs(const LEUnicode chars[], le_int32 offse
         return 0;
     }
 
-    charIndices = LE_NEW_ARRAY(le_int32, count * 2);
+    glyphStorage.allocateGlyphArray(count * 2, FALSE, success);
 
-    if (charIndices == NULL) {
+    if (LE_FAILURE(success)) {
         LE_DELETE_ARRAY(outChars);
         success = LE_MEMORY_ALLOCATION_ERROR;
         return 0;
     }
 
-    glyphCount = ThaiShaping::compose(chars, offset, count, fGlyphSet, fErrorChar, outChars, charIndices);
-    mapCharsToGlyphs(outChars, 0, glyphCount, false, false, glyphs, charIndices, success);
+    glyphCount = ThaiShaping::compose(chars, offset, count, fGlyphSet, fErrorChar, outChars, glyphStorage);
+    mapCharsToGlyphs(outChars, 0, glyphCount, FALSE, FALSE, glyphStorage, success);
 
     LE_DELETE_ARRAY(outChars);
 
+    glyphStorage.adoptGlyphCount(glyphCount);
     return glyphCount;
 }
 
+// This is the same as LayoutEngline::adjustGlyphPositions() except that it doesn't call adjustMarkGlyphs
+void ThaiLayoutEngine::adjustGlyphPositions(const LEUnicode chars[], le_int32 offset, le_int32 count, le_bool  /*reverse*/,
+                                        LEGlyphStorage &glyphStorage, LEErrorCode &success)
+{
+    if (LE_FAILURE(success)) {
+        return;
+    }
+
+    if (chars == NULL || offset < 0 || count < 0) {
+        success = LE_ILLEGAL_ARGUMENT_ERROR;
+        return;
+    }
+
+    if (fTypoFlags & LE_Kerning_FEATURE_FLAG) { /* kerning enabled */
+      LETableReference kernTable(fFontInstance, LE_KERN_TABLE_TAG, success);
+      KernTable kt(kernTable, success);
+      kt.process(glyphStorage, success);
+    }
+
+    // default is no adjustments
+    return;
+}
+
 U_NAMESPACE_END