icuSources/layout/AnchorTables.cpp

   1 /*
   2  *
   3  * (C) Copyright IBM Corp. 1998-2005 - All Rights Reserved
   4  *
   5  */
   6
   7 #include "LETypes.h"
   8 #include "LEFontInstance.h"
   9 #include "DeviceTables.h"
  10 #include "AnchorTables.h"
  11 #include "LESwaps.h"
  12
  13 U_NAMESPACE_BEGIN
  14
  15 void AnchorTable::getAnchor(LEGlyphID glyphID, const LEFontInstance *fontInstance,
  16                             LEPoint &anchor) const
  17 {
  18     switch(SWAPW(anchorFormat)) {
  19     case 1:
  20     {
  21         const Format1AnchorTable *f1 = (const Format1AnchorTable *) this;
  22
  23         f1->getAnchor(fontInstance, anchor);
  24         break;
  25     }
  26
  27     case 2:
  28     {
  29         const Format2AnchorTable *f2 = (const Format2AnchorTable *) this;
  30
  31         f2->getAnchor(glyphID, fontInstance, anchor);
  32         break;
  33     }
  34
  35     case 3:
  36     {
  37         const Format3AnchorTable *f3 = (const Format3AnchorTable *) this;
  38
  39         f3->getAnchor(fontInstance, anchor);
  40         break;
  41     }
  42
  43     default:
  44         // unknown format: just use x, y coordinate, like format 1...
  45         const Format1AnchorTable *f1 = (const Format1AnchorTable *) this;
  46
  47         f1->getAnchor(fontInstance, anchor);
  48         break;
  49     }
  50 }
  51
  52 void Format1AnchorTable::getAnchor(const LEFontInstance *fontInstance, LEPoint &anchor) const
  53 {
  54     le_int16 x = SWAPW(xCoordinate);
  55     le_int16 y = SWAPW(yCoordinate);
  56     LEPoint pixels;
  57
  58     fontInstance->transformFunits(x, y, pixels);
  59
  60     fontInstance->pixelsToUnits(pixels, anchor);
  61 }
  62
  63 void Format2AnchorTable::getAnchor(LEGlyphID glyphID, const LEFontInstance *fontInstance, LEPoint &anchor) const
  64 {
  65     LEPoint point;
  66
  67     if (! fontInstance->getGlyphPoint(glyphID, SWAPW(anchorPoint), point)) {
  68         le_int16 x = SWAPW(xCoordinate);
  69         le_int16 y = SWAPW(yCoordinate);
  70
  71         fontInstance->transformFunits(x, y, point);
  72     }
  73
  74
  75     fontInstance->pixelsToUnits(point, anchor);
  76 }
  77
  78 void Format3AnchorTable::getAnchor(const LEFontInstance *fontInstance, LEPoint &anchor) const
  79 {
  80     le_int16 x = SWAPW(xCoordinate);
  81     le_int16 y = SWAPW(yCoordinate);
  82     LEPoint pixels;
  83     Offset dtxOffset = SWAPW(xDeviceTableOffset);
  84     Offset dtyOffset = SWAPW(yDeviceTableOffset);
  85
  86     fontInstance->transformFunits(x, y, pixels);
  87
  88     if (dtxOffset != 0) {
  89         const DeviceTable *dtx = (const DeviceTable *) ((char *) this + dtxOffset);
  90         le_int16 adjx = dtx->getAdjustment((le_int16) fontInstance->getXPixelsPerEm());
  91
  92         pixels.fX += adjx;
  93     }
  94
  95     if (dtyOffset != 0) {
  96         const DeviceTable *dty = (const DeviceTable *) ((char *) this + dtyOffset);
  97         le_int16 adjy = dty->getAdjustment((le_int16) fontInstance->getYPixelsPerEm());
  98
  99         pixels.fY += adjy;
 100     }
 101
 102     fontInstance->pixelsToUnits(pixels, anchor);
 103 }
 104
 105 U_NAMESPACE_END
 106