icuSources/layout/ValueRecords.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 "OpenTypeTables.h"
  10 #include "ValueRecords.h"
  11 #include "DeviceTables.h"
  12 #include "GlyphIterator.h"
  13 #include "LESwaps.h"
  14
  15 U_NAMESPACE_BEGIN
  16
  17 #define Nibble(value, nibble) ((value >> (nibble * 4)) & 0xF)
  18 #define NibbleBits(value, nibble) (bitsInNibble[Nibble(value, nibble)])
  19
  20 le_int16 ValueRecord::getFieldValue(ValueFormat valueFormat, ValueRecordField field) const
  21 {
  22     le_int16 valueIndex = getFieldIndex(valueFormat, field);
  23     le_int16 value = values[valueIndex];
  24
  25     return SWAPW(value);
  26 }
  27
  28 le_int16 ValueRecord::getFieldValue(le_int16 index, ValueFormat valueFormat, ValueRecordField field) const
  29 {
  30     le_int16 baseIndex = getFieldCount(valueFormat) * index;
  31     le_int16 valueIndex = getFieldIndex(valueFormat, field);
  32     le_int16 value = values[baseIndex + valueIndex];
  33
  34     return SWAPW(value);
  35 }
  36
  37 void ValueRecord::adjustPosition(ValueFormat valueFormat, const char *base, GlyphIterator &glyphIterator,
  38                                  const LEFontInstance *fontInstance) const
  39 {
  40     float xPlacementAdjustment = 0;
  41     float yPlacementAdjustment = 0;
  42     float xAdvanceAdjustment   = 0;
  43     float yAdvanceAdjustment   = 0;
  44
  45     if ((valueFormat & vfbXPlacement) != 0) {
  46         le_int16 value = getFieldValue(valueFormat, vrfXPlacement);
  47         LEPoint pixels;
  48
  49         fontInstance->transformFunits(value, 0, pixels);
  50
  51         xPlacementAdjustment += fontInstance->xPixelsToUnits(pixels.fX);
  52         yPlacementAdjustment += fontInstance->yPixelsToUnits(pixels.fY);
  53     }
  54
  55     if ((valueFormat & vfbYPlacement) != 0) {
  56         le_int16 value = getFieldValue(valueFormat, vrfYPlacement);
  57         LEPoint pixels;
  58
  59         fontInstance->transformFunits(0, value, pixels);
  60
  61         xPlacementAdjustment += fontInstance->xPixelsToUnits(pixels.fX);
  62         yPlacementAdjustment += fontInstance->yPixelsToUnits(pixels.fY);
  63     }
  64
  65     if ((valueFormat & vfbXAdvance) != 0) {
  66         le_int16 value = getFieldValue(valueFormat, vrfXAdvance);
  67         LEPoint pixels;
  68
  69         fontInstance->transformFunits(value, 0, pixels);
  70
  71         xAdvanceAdjustment += fontInstance->xPixelsToUnits(pixels.fX);
  72         yAdvanceAdjustment += fontInstance->yPixelsToUnits(pixels.fY);
  73     }
  74
  75     if ((valueFormat & vfbYAdvance) != 0) {
  76         le_int16 value = getFieldValue(valueFormat, vrfYAdvance);
  77         LEPoint pixels;
  78
  79         fontInstance->transformFunits(0, value, pixels);
  80
  81         xAdvanceAdjustment += fontInstance->xPixelsToUnits(pixels.fX);
  82         yAdvanceAdjustment += fontInstance->yPixelsToUnits(pixels.fY);
  83     }
  84
  85     // FIXME: The device adjustments should really be transformed, but
  86     // the only way I know how to do that is to convert them to le_int16 units,
  87     // transform them, and then convert them back to pixels. Sigh...
  88     if ((valueFormat & vfbAnyDevice) != 0) {
  89         le_int16 xppem = (le_int16) fontInstance->getXPixelsPerEm();
  90         le_int16 yppem = (le_int16) fontInstance->getYPixelsPerEm();
  91
  92         if ((valueFormat & vfbXPlaDevice) != 0) {
  93             Offset dtOffset = getFieldValue(valueFormat, vrfXPlaDevice);
  94
  95             if (dtOffset != 0) {
  96                 const DeviceTable *dt = (const DeviceTable *) (base + dtOffset);
  97                 le_int16 xAdj = dt->getAdjustment(xppem);
  98
  99                 xPlacementAdjustment += fontInstance->xPixelsToUnits(xAdj);
 100             }
 101         }
 102
 103         if ((valueFormat & vfbYPlaDevice) != 0) {
 104             Offset dtOffset = getFieldValue(valueFormat, vrfYPlaDevice);
 105
 106             if (dtOffset != 0) {
 107                 const DeviceTable *dt = (const DeviceTable *) (base + dtOffset);
 108                 le_int16 yAdj = dt->getAdjustment(yppem);
 109
 110                 yPlacementAdjustment += fontInstance->yPixelsToUnits(yAdj);
 111             }
 112         }
 113
 114         if ((valueFormat & vfbXAdvDevice) != 0) {
 115             Offset dtOffset = getFieldValue(valueFormat, vrfXAdvDevice);
 116
 117             if (dtOffset != 0) {
 118                 const DeviceTable *dt = (const DeviceTable *) (base + dtOffset);
 119                 le_int16 xAdj = dt->getAdjustment(xppem);
 120
 121                 xAdvanceAdjustment += fontInstance->xPixelsToUnits(xAdj);
 122             }
 123         }
 124
 125         if ((valueFormat & vfbYAdvDevice) != 0) {
 126             Offset dtOffset = getFieldValue(valueFormat, vrfYAdvDevice);
 127
 128             if (dtOffset != 0) {
 129                 const DeviceTable *dt = (const DeviceTable *) (base + dtOffset);
 130                 le_int16 yAdj = dt->getAdjustment(yppem);
 131
 132                 yAdvanceAdjustment += fontInstance->yPixelsToUnits(yAdj);
 133             }
 134         }
 135     }
 136
 137     glyphIterator.adjustCurrGlyphPositionAdjustment(
 138         xPlacementAdjustment, yPlacementAdjustment, xAdvanceAdjustment, yAdvanceAdjustment);
 139 }
 140
 141 void ValueRecord::adjustPosition(le_int16 index, ValueFormat valueFormat, const char *base, GlyphIterator &glyphIterator,
 142                                  const LEFontInstance *fontInstance) const
 143 {
 144     float xPlacementAdjustment = 0;
 145     float yPlacementAdjustment = 0;
 146     float xAdvanceAdjustment   = 0;
 147     float yAdvanceAdjustment   = 0;
 148
 149     if ((valueFormat & vfbXPlacement) != 0) {
 150         le_int16 value = getFieldValue(index, valueFormat, vrfXPlacement);
 151         LEPoint pixels;
 152
 153         fontInstance->transformFunits(value, 0, pixels);
 154
 155         xPlacementAdjustment += fontInstance->xPixelsToUnits(pixels.fX);
 156         yPlacementAdjustment += fontInstance->yPixelsToUnits(pixels.fY);
 157     }
 158
 159     if ((valueFormat & vfbYPlacement) != 0) {
 160         le_int16 value = getFieldValue(index, valueFormat, vrfYPlacement);
 161         LEPoint pixels;
 162
 163         fontInstance->transformFunits(0, value, pixels);
 164
 165         xPlacementAdjustment += fontInstance->xPixelsToUnits(pixels.fX);
 166         yPlacementAdjustment += fontInstance->yPixelsToUnits(pixels.fY);
 167     }
 168
 169     if ((valueFormat & vfbXAdvance) != 0) {
 170         le_int16 value = getFieldValue(index, valueFormat, vrfXAdvance);
 171         LEPoint pixels;
 172
 173         fontInstance->transformFunits(value, 0, pixels);
 174
 175         xAdvanceAdjustment += fontInstance->xPixelsToUnits(pixels.fX);
 176         yAdvanceAdjustment += fontInstance->yPixelsToUnits(pixels.fY);
 177     }
 178
 179     if ((valueFormat & vfbYAdvance) != 0) {
 180         le_int16 value = getFieldValue(index, valueFormat, vrfYAdvance);
 181         LEPoint pixels;
 182
 183         fontInstance->transformFunits(0, value, pixels);
 184
 185         xAdvanceAdjustment += fontInstance->xPixelsToUnits(pixels.fX);
 186         yAdvanceAdjustment += fontInstance->yPixelsToUnits(pixels.fY);
 187     }
 188
 189     // FIXME: The device adjustments should really be transformed, but
 190     // the only way I know how to do that is to convert them to le_int16 units,
 191     // transform them, and then convert them back to pixels. Sigh...
 192     if ((valueFormat & vfbAnyDevice) != 0) {
 193         le_int16 xppem = (le_int16) fontInstance->getXPixelsPerEm();
 194         le_int16 yppem = (le_int16) fontInstance->getYPixelsPerEm();
 195
 196         if ((valueFormat & vfbXPlaDevice) != 0) {
 197             Offset dtOffset = getFieldValue(index, valueFormat, vrfXPlaDevice);
 198
 199             if (dtOffset != 0) {
 200                 const DeviceTable *dt = (const DeviceTable *) (base + dtOffset);
 201                 le_int16 xAdj = dt->getAdjustment(xppem);
 202
 203                 xPlacementAdjustment += fontInstance->xPixelsToUnits(xAdj);
 204             }
 205         }
 206
 207         if ((valueFormat & vfbYPlaDevice) != 0) {
 208             Offset dtOffset = getFieldValue(index, valueFormat, vrfYPlaDevice);
 209
 210             if (dtOffset != 0) {
 211                 const DeviceTable *dt = (const DeviceTable *) (base + dtOffset);
 212                 le_int16 yAdj = dt->getAdjustment(yppem);
 213
 214                 yPlacementAdjustment += fontInstance->yPixelsToUnits(yAdj);
 215             }
 216         }
 217
 218         if ((valueFormat & vfbXAdvDevice) != 0) {
 219             Offset dtOffset = getFieldValue(index, valueFormat, vrfXAdvDevice);
 220
 221             if (dtOffset != 0) {
 222                 const DeviceTable *dt = (const DeviceTable *) (base + dtOffset);
 223                 le_int16 xAdj = dt->getAdjustment(xppem);
 224
 225                 xAdvanceAdjustment += fontInstance->xPixelsToUnits(xAdj);
 226             }
 227         }
 228
 229         if ((valueFormat & vfbYAdvDevice) != 0) {
 230             Offset dtOffset = getFieldValue(index, valueFormat, vrfYAdvDevice);
 231
 232             if (dtOffset != 0) {
 233                 const DeviceTable *dt = (const DeviceTable *) (base + dtOffset);
 234                 le_int16 yAdj = dt->getAdjustment(yppem);
 235
 236                 yAdvanceAdjustment += fontInstance->yPixelsToUnits(yAdj);
 237             }
 238         }
 239     }
 240
 241     glyphIterator.adjustCurrGlyphPositionAdjustment(
 242         xPlacementAdjustment, yPlacementAdjustment, xAdvanceAdjustment, yAdvanceAdjustment);
 243 }
 244
 245 le_int16 ValueRecord::getSize(ValueFormat valueFormat)
 246 {
 247     return getFieldCount(valueFormat) * sizeof(le_int16);
 248 }
 249
 250 le_int16 ValueRecord::getFieldCount(ValueFormat valueFormat)
 251 {
 252     static const le_int16 bitsInNibble[] =
 253     {
 254         0 + 0 + 0 + 0,
 255         0 + 0 + 0 + 1,
 256         0 + 0 + 1 + 0,
 257         0 + 0 + 1 + 1,
 258         0 + 1 + 0 + 0,
 259         0 + 1 + 0 + 1,
 260         0 + 1 + 1 + 0,
 261         0 + 1 + 1 + 1,
 262         1 + 0 + 0 + 0,
 263         1 + 0 + 0 + 1,
 264         1 + 0 + 1 + 0,
 265         1 + 0 + 1 + 1,
 266         1 + 1 + 0 + 0,
 267         1 + 1 + 0 + 1,
 268         1 + 1 + 1 + 0,
 269         1 + 1 + 1 + 1
 270     };
 271
 272     valueFormat &= ~vfbReserved;
 273
 274     return NibbleBits(valueFormat, 0) + NibbleBits(valueFormat, 1) +
 275            NibbleBits(valueFormat, 2) + NibbleBits(valueFormat, 3);
 276 }
 277
 278 le_int16 ValueRecord::getFieldIndex(ValueFormat valueFormat, ValueRecordField field)
 279 {
 280     static const le_uint16 beforeMasks[] =
 281     {
 282         0x0000,
 283         0x0001,
 284         0x0003,
 285         0x0007,
 286         0x000F,
 287         0x001F,
 288         0x003F,
 289         0x007F,
 290         0x00FF,
 291         0x01FF,
 292         0x03FF,
 293         0x07FF,
 294         0x0FFF,
 295         0x1FFF,
 296         0x3FFF,
 297         0x7FFF,
 298         0xFFFF
 299     };
 300
 301     return getFieldCount(valueFormat & beforeMasks[field]);
 302 }
 303
 304 U_NAMESPACE_END