icuSources/layout/AnchorTables.cpp

   1 /*
   2  *
   3  * (C) Copyright IBM Corp. 1998-2004 - 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, set the anchor point to (0, 0)
  45         anchor.fX = 0;
  46         anchor.fY = 0;
  47         break;
  48     }
  49 }
  50
  51 void Format1AnchorTable::getAnchor(const LEFontInstance *fontInstance, LEPoint &anchor) const
  52 {
  53     le_int16 x = SWAPW(xCoordinate);
  54     le_int16 y = SWAPW(yCoordinate);
  55     LEPoint pixels;
  56
  57     fontInstance->transformFunits(x, y, pixels);
  58
  59     fontInstance->pixelsToUnits(pixels, anchor);
  60 }
  61
  62 void Format2AnchorTable::getAnchor(LEGlyphID glyphID, const LEFontInstance *fontInstance, LEPoint &anchor) const
  63 {
  64     LEPoint point;
  65
  66     if (! fontInstance->getGlyphPoint(glyphID, SWAPW(anchorPoint), point)) {
  67         le_int16 x = SWAPW(xCoordinate);
  68         le_int16 y = SWAPW(yCoordinate);
  69
  70         fontInstance->transformFunits(x, y, point);
  71     }
  72
  73
  74     fontInstance->pixelsToUnits(point, anchor);
  75 }
  76
  77 void Format3AnchorTable::getAnchor(const LEFontInstance *fontInstance, LEPoint &anchor) const
  78 {
  79     le_int16 x = SWAPW(xCoordinate);
  80     le_int16 y = SWAPW(yCoordinate);
  81     LEPoint pixels;
  82     Offset dtxOffset = SWAPW(xDeviceTableOffset);
  83     Offset dtyOffset = SWAPW(yDeviceTableOffset);
  84
  85     fontInstance->transformFunits(x, y, pixels);
  86
  87     if (dtxOffset != 0) {
  88         const DeviceTable *dtx = (const DeviceTable *) ((char *) this + dtxOffset);
  89         le_int16 adjx = dtx->getAdjustment((le_int16) fontInstance->getXPixelsPerEm());
  90
  91         pixels.fX += adjx;
  92     }
  93
  94     if (dtyOffset != 0) {
  95         const DeviceTable *dty = (const DeviceTable *) ((char *) this + dtyOffset);
  96         le_int16 adjy = dty->getAdjustment((le_int16) fontInstance->getYPixelsPerEm());
  97
  98         pixels.fY += adjy;
  99     }
 100
 101     fontInstance->pixelsToUnits(pixels, anchor);
 102 }
 103
 104 U_NAMESPACE_END
 105