summaryrefslogtreecommitdiff
path: root/Build/source/libs/icu-xetex/layout/MarkToBasePosnSubtables.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'Build/source/libs/icu-xetex/layout/MarkToBasePosnSubtables.cpp')
-rw-r--r--Build/source/libs/icu-xetex/layout/MarkToBasePosnSubtables.cpp99
1 files changed, 99 insertions, 0 deletions
diff --git a/Build/source/libs/icu-xetex/layout/MarkToBasePosnSubtables.cpp b/Build/source/libs/icu-xetex/layout/MarkToBasePosnSubtables.cpp
new file mode 100644
index 00000000000..6843c4a1c80
--- /dev/null
+++ b/Build/source/libs/icu-xetex/layout/MarkToBasePosnSubtables.cpp
@@ -0,0 +1,99 @@
+/*
+ *
+ * (C) Copyright IBM Corp. 1998-2004 - All Rights Reserved
+ *
+ */
+
+#include "LETypes.h"
+#include "LEFontInstance.h"
+#include "OpenTypeTables.h"
+#include "AnchorTables.h"
+#include "MarkArrays.h"
+#include "GlyphPositioningTables.h"
+#include "AttachmentPosnSubtables.h"
+#include "MarkToBasePosnSubtables.h"
+#include "GlyphIterator.h"
+#include "LESwaps.h"
+
+U_NAMESPACE_BEGIN
+
+LEGlyphID MarkToBasePositioningSubtable::findBaseGlyph(GlyphIterator *glyphIterator) const
+{
+ if (glyphIterator->prev()) {
+ return glyphIterator->getCurrGlyphID();
+ }
+
+ return 0xFFFF;
+}
+
+le_int32 MarkToBasePositioningSubtable::process(GlyphIterator *glyphIterator, const LEFontInstance *fontInstance) const
+{
+ LEGlyphID markGlyph = glyphIterator->getCurrGlyphID();
+ le_int32 markCoverage = getGlyphCoverage((LEGlyphID) markGlyph);
+
+ if (markCoverage < 0) {
+ // markGlyph isn't a covered mark glyph
+ return 0;
+ }
+
+ LEPoint markAnchor;
+ const MarkArray *markArray = (const MarkArray *) ((char *) this + SWAPW(markArrayOffset));
+ le_int32 markClass = markArray->getMarkClass(markGlyph, markCoverage, fontInstance, markAnchor);
+ le_uint16 mcCount = SWAPW(classCount);
+
+ if (markClass < 0 || markClass >= mcCount) {
+ // markGlyph isn't in the mark array or its
+ // mark class is too big. The table is mal-formed!
+ return 0;
+ }
+
+ // FIXME: We probably don't want to find a base glyph before a previous ligature...
+ GlyphIterator baseIterator(*glyphIterator, (le_uint16) (lfIgnoreMarks /*| lfIgnoreLigatures*/));
+ LEGlyphID baseGlyph = findBaseGlyph(&baseIterator);
+ le_int32 baseCoverage = getBaseCoverage((LEGlyphID) baseGlyph);
+ const BaseArray *baseArray = (const BaseArray *) ((char *) this + SWAPW(baseArrayOffset));
+ le_uint16 baseCount = SWAPW(baseArray->baseRecordCount);
+
+ if (baseCoverage < 0 || baseCoverage >= baseCount) {
+ // The base glyph isn't covered, or the coverage
+ // index is too big. The latter means that the
+ // table is mal-formed...
+ return 0;
+ }
+
+ const BaseRecord *baseRecord = &baseArray->baseRecordArray[baseCoverage * mcCount];
+ Offset anchorTableOffset = SWAPW(baseRecord->baseAnchorTableOffsetArray[markClass]);
+ const AnchorTable *anchorTable = (const AnchorTable *) ((char *) baseArray + anchorTableOffset);
+ LEPoint baseAnchor, markAdvance, pixels;
+
+ if (anchorTableOffset == 0) {
+ // this means the table is mal-formed...
+ glyphIterator->setCurrGlyphBaseOffset(baseIterator.getCurrStreamPosition());
+ return 0;
+ }
+
+ anchorTable->getAnchor(baseGlyph, fontInstance, baseAnchor);
+
+ fontInstance->getGlyphAdvance(markGlyph, pixels);
+ fontInstance->pixelsToUnits(pixels, markAdvance);
+
+ float anchorDiffX = baseAnchor.fX - markAnchor.fX;
+ float anchorDiffY = baseAnchor.fY - markAnchor.fY;
+
+ glyphIterator->setCurrGlyphBaseOffset(baseIterator.getCurrStreamPosition());
+
+ if (glyphIterator->isRightToLeft()) {
+ glyphIterator->setCurrGlyphPositionAdjustment(anchorDiffX, anchorDiffY, -markAdvance.fX, -markAdvance.fY);
+ } else {
+ LEPoint baseAdvance;
+
+ fontInstance->getGlyphAdvance(baseGlyph, pixels);
+ fontInstance->pixelsToUnits(pixels, baseAdvance);
+
+ glyphIterator->setCurrGlyphPositionAdjustment(anchorDiffX - baseAdvance.fX, anchorDiffY - baseAdvance.fY, -markAdvance.fX, -markAdvance.fY);
+ }
+
+ return 1;
+}
+
+U_NAMESPACE_END