ICU-3294 Save entry/exit points when processing cursive attachment subtables, position glyphs after GPOS processing.

X-SVN-Rev: 17123

icu4c/source/layout/GlyphPositionAdjustments.cpp

@@ -0,0 +1,162 @@
+/*
+ *
+ * (C) Copyright IBM Corp. 1998-2005 - All Rights Reserved
+ *
+ */
+
+#include "LETypes.h"
+#include "GlyphPositionAdjustments.h"
+#include "LEGlyphStorage.h"
+#include "LEFontInstance.h"
+
+U_NAMESPACE_BEGIN
+
+#define CHECK_ALLOCATE_ARRAY(array, type, size) \
+    if (array == NULL) { \
+        array = (type *) new type[size]; \
+    }
+
+GlyphPositionAdjustments::GlyphPositionAdjustments(le_int32 glyphCount)
+    : fGlyphCount(glyphCount), fEntryExitPoints(NULL), fAdjustments(NULL)
+{
+    fAdjustments = (Adjustment *) new Adjustment[glyphCount];
+}
+
+GlyphPositionAdjustments::~GlyphPositionAdjustments()
+{
+    delete[] fEntryExitPoints;
+    delete[] fAdjustments;
+}
+
+const LEPoint *GlyphPositionAdjustments::getEntryPoint(le_int32 index, LEPoint &entryPoint) const
+{
+    if (fEntryExitPoints == NULL) {
+        return NULL;
+    }
+
+    return fEntryExitPoints[index].getEntryPoint(entryPoint);
+}
+
+const LEPoint *GlyphPositionAdjustments::getExitPoint(le_int32 index, LEPoint &exitPoint)const
+{
+    if (fEntryExitPoints == NULL) {
+        return NULL;
+    }
+
+    return fEntryExitPoints[index].getExitPoint(exitPoint);
+}
+
+void GlyphPositionAdjustments::setEntryPoint(le_int32 index, LEPoint &newEntryPoint)
+{
+    CHECK_ALLOCATE_ARRAY(fEntryExitPoints, EntryExitPoint, fGlyphCount);
+
+    fEntryExitPoints[index].setEntryPoint(newEntryPoint);
+}
+
+void GlyphPositionAdjustments::setExitPoint(le_int32 index, LEPoint &newExitPoint)
+{
+    CHECK_ALLOCATE_ARRAY(fEntryExitPoints, EntryExitPoint, fGlyphCount);
+
+    fEntryExitPoints[index].setExitPoint(newExitPoint);
+}
+
+void GlyphPositionAdjustments::setCursiveGlyph(le_int32 index)
+{
+    CHECK_ALLOCATE_ARRAY(fEntryExitPoints, EntryExitPoint, fGlyphCount);
+
+    fEntryExitPoints[index].setCursiveGlyph();
+}
+
+void GlyphPositionAdjustments::applyCursiveAdjustments(LEGlyphStorage &glyphStorage, le_bool rightToLeft, const LEFontInstance *fontInstance)
+{
+    if (! hasCursiveGlyphs()) {
+        return;
+    }
+
+    le_int32 start = 0, end = fGlyphCount, dir = 1;
+    le_int32 firstExitPoint = -1, lastExitPoint = -1;
+    LEPoint entryAnchor, exitAnchor, pixels;
+    LEGlyphID lastExitGlyphID;
+    float baselineAdjustment = 0;
+
+    if (rightToLeft) {
+        start = fGlyphCount - 1;
+        end = -1;
+        dir = -1;
+    }
+
+    for (le_int32 i = start; i != end; i += dir) {
+        LEGlyphID glyphID = glyphStorage[i];
+
+        if (isCursiveGlyph(i)) {
+            if (lastExitPoint >= 0 && getEntryPoint(i, entryAnchor) != NULL) {
+                float anchorDiffX = exitAnchor.fX - entryAnchor.fX;
+                float anchorDiffY = exitAnchor.fY - entryAnchor.fY;
+
+                baselineAdjustment += anchorDiffY;
+                adjustYPlacement(i, baselineAdjustment);
+
+                if (rightToLeft) {
+                    LEPoint secondAdvance;
+
+                    fontInstance->getGlyphAdvance(glyphID, pixels);
+                    fontInstance->pixelsToUnits(pixels, secondAdvance);
+
+                    adjustXAdvance(i, -(anchorDiffX + secondAdvance.fX));
+                } else {
+                    LEPoint firstAdvance;
+
+                    fontInstance->getGlyphAdvance(lastExitGlyphID, pixels);
+                    fontInstance->pixelsToUnits(pixels, firstAdvance);
+
+                    adjustXAdvance(lastExitPoint, anchorDiffX - firstAdvance.fX);
+                }
+            }
+
+            lastExitPoint = i;
+
+            if (getExitPoint(i, exitAnchor) != NULL) {
+                if (firstExitPoint < 0) {
+                    firstExitPoint = i;
+                }
+
+                lastExitGlyphID = glyphID;
+            } else {
+                if (/*baselineIsLogicalEnd &&*/ firstExitPoint >= 0 && lastExitPoint >= 0) {
+                    le_int32 limit = lastExitPoint + dir;
+
+                    for (le_int32 j = firstExitPoint; j != limit; j += dir) {
+                        if (isCursiveGlyph(j)) {
+                            adjustYPlacement(j, -baselineAdjustment);
+                        }
+                    }
+                }
+
+                firstExitPoint = lastExitPoint = -1;
+                baselineAdjustment = 0;
+            }
+        }
+    }
+}
+
+LEPoint *GlyphPositionAdjustments::EntryExitPoint::getEntryPoint(LEPoint &entryPoint) const
+{
+    if (fFlags & EEF_HAS_ENTRY_POINT) {
+        entryPoint = fEntryPoint;
+        return &entryPoint;
+    }
+
+    return NULL;
+}
+
+LEPoint *GlyphPositionAdjustments::EntryExitPoint::getExitPoint(LEPoint &exitPoint) const
+{
+    if (fFlags & EEF_HAS_EXIT_POINT) {
+        exitPoint = fExitPoint;
+        return &exitPoint;
+    }
+
+    return NULL;
+}
+
+U_NAMESPACE_END