SkScalerContext_FreeType::SkScalerContext_FreeType(const SkDescriptor* desc)
: SkScalerContext(desc) {
SkAutoMutexAcquire ac(gFTMutex);
if (gFTCount == 0) {
if (!InitFreetype()) {
sk_throw();
}
}
++gFTCount;
// load the font file
fFTSize = NULL;
fFace = NULL;
fFaceRec = ref_ft_face(fRec.fFontID);
if (NULL == fFaceRec) {
return;
}
fFace = fFaceRec->fFace;
// compute our factors from the record
SkMatrix m;
fRec.getSingleMatrix(&m);
#ifdef DUMP_STRIKE_CREATION
SkString keyString;
SkFontHost::GetDescriptorKeyString(desc, &keyString);
printf("========== strike [%g %g %g] [%g %g %g %g] hints %d format %d %s\n", SkScalarToFloat(fRec.fTextSize),
SkScalarToFloat(fRec.fPreScaleX), SkScalarToFloat(fRec.fPreSkewX),
SkScalarToFloat(fRec.fPost2x2[0][0]), SkScalarToFloat(fRec.fPost2x2[0][1]),
SkScalarToFloat(fRec.fPost2x2[1][0]), SkScalarToFloat(fRec.fPost2x2[1][1]),
fRec.getHinting(), fRec.fMaskFormat, keyString.c_str());
#endif
// now compute our scale factors
SkScalar sx = m.getScaleX();
SkScalar sy = m.getScaleY();
if (m.getSkewX() || m.getSkewY() || sx < 0 || sy < 0) {
// sort of give up on hinting
sx = SkMaxScalar(SkScalarAbs(sx), SkScalarAbs(m.getSkewX()));
sy = SkMaxScalar(SkScalarAbs(m.getSkewY()), SkScalarAbs(sy));
sx = sy = SkScalarAve(sx, sy);
SkScalar inv = SkScalarInvert(sx);
// flip the skew elements to go from our Y-down system to FreeType's
fMatrix22.xx = SkScalarToFixed(SkScalarMul(m.getScaleX(), inv));
fMatrix22.xy = -SkScalarToFixed(SkScalarMul(m.getSkewX(), inv));
fMatrix22.yx = -SkScalarToFixed(SkScalarMul(m.getSkewY(), inv));
fMatrix22.yy = SkScalarToFixed(SkScalarMul(m.getScaleY(), inv));
} else {
fMatrix22.xx = fMatrix22.yy = SK_Fixed1;
fMatrix22.xy = fMatrix22.yx = 0;
}
fScaleX = SkScalarToFixed(sx);
fScaleY = SkScalarToFixed(sy);
// compute the flags we send to Load_Glyph
{
FT_Int32 loadFlags = FT_LOAD_DEFAULT;
if (SkMask::kBW_Format == fRec.fMaskFormat) {
// See http://code.google.com/p/chromium/issues/detail?id=43252#c24
loadFlags = FT_LOAD_TARGET_MONO;
if (fRec.getHinting() == SkPaint::kNo_Hinting)
loadFlags = FT_LOAD_NO_HINTING;
} else {
switch (fRec.getHinting()) {
case SkPaint::kNo_Hinting:
loadFlags = FT_LOAD_NO_HINTING;
break;
case SkPaint::kSlight_Hinting:
loadFlags = FT_LOAD_TARGET_LIGHT; // This implies FORCE_AUTOHINT
break;
case SkPaint::kNormal_Hinting:
loadFlags = FT_LOAD_TARGET_NORMAL;
break;
case SkPaint::kFull_Hinting:
loadFlags = FT_LOAD_TARGET_NORMAL;
if (SkMask::kHorizontalLCD_Format == fRec.fMaskFormat)
loadFlags = FT_LOAD_TARGET_LCD;
else if (SkMask::kVerticalLCD_Format == fRec.fMaskFormat)
loadFlags = FT_LOAD_TARGET_LCD_V;
break;
default:
SkDebugf("---------- UNKNOWN hinting %d\n", fRec.getHinting());
break;
}
}
if ((fRec.fFlags & SkScalerContext::kEmbeddedBitmapText_Flag) == 0)
loadFlags |= FT_LOAD_NO_BITMAP;
fLoadGlyphFlags = loadFlags;
}
// now create the FT_Size
{
FT_Error err;
err = FT_New_Size(fFace, &fFTSize);
if (err != 0) {
SkDEBUGF(("SkScalerContext_FreeType::FT_New_Size(%x): FT_Set_Char_Size(0x%x, 0x%x) returned 0x%x\n",
fFaceRec->fFontID, fScaleX, fScaleY, err));
fFace = NULL;
return;
}
err = FT_Activate_Size(fFTSize);
if (err != 0) {
SkDEBUGF(("SkScalerContext_FreeType::FT_Activate_Size(%x, 0x%x, 0x%x) returned 0x%x\n",
fFaceRec->fFontID, fScaleX, fScaleY, err));
fFTSize = NULL;
}
err = FT_Set_Char_Size( fFace,
SkFixedToFDot6(fScaleX), SkFixedToFDot6(fScaleY),
72, 72);
if (err != 0) {
SkDEBUGF(("SkScalerContext_FreeType::FT_Set_Char_Size(%x, 0x%x, 0x%x) returned 0x%x\n",
fFaceRec->fFontID, fScaleX, fScaleY, err));
fFace = NULL;
return;
}
FT_Set_Transform( fFace, &fMatrix22, NULL);
}
}
SkScalerContext_FreeType::SkScalerContext_FreeType(const SkDescriptor* desc)
: SkScalerContext(desc), fFTSize(NULL) {
SkAutoMutexAcquire ac(gFTMutex);
FT_Error err;
if (gFTCount == 0) {
err = FT_Init_FreeType(&gFTLibrary);
// SkDEBUGF(("FT_Init_FreeType returned %d\n", err));
SkASSERT(err == 0);
}
++gFTCount;
// load the font file
fFaceRec = ref_ft_face(fRec.fFontID);
fFace = fFaceRec ? fFaceRec->fFace : NULL;
// compute our factors from the record
SkMatrix m;
fRec.getSingleMatrix(&m);
#ifdef DUMP_STRIKE_CREATION
SkString keyString;
SkFontHost::GetDescriptorKeyString(desc, &keyString);
printf("========== strike [%g %g %g] [%g %g %g %g] hints %d format %d %s\n", SkScalarToFloat(fRec.fTextSize),
SkScalarToFloat(fRec.fPreScaleX), SkScalarToFloat(fRec.fPreSkewX),
SkScalarToFloat(fRec.fPost2x2[0][0]), SkScalarToFloat(fRec.fPost2x2[0][1]),
SkScalarToFloat(fRec.fPost2x2[1][0]), SkScalarToFloat(fRec.fPost2x2[1][1]),
fRec.fHints, fRec.fMaskFormat, keyString.c_str());
#endif
// now compute our scale factors
SkScalar sx = m.getScaleX();
SkScalar sy = m.getScaleY();
if (m.getSkewX() || m.getSkewY() || sx < 0 || sy < 0) {
// sort of give up on hinting
sx = SkMaxScalar(SkScalarAbs(sx), SkScalarAbs(m.getSkewX()));
sy = SkMaxScalar(SkScalarAbs(m.getSkewY()), SkScalarAbs(sy));
sx = sy = SkScalarAve(sx, sy);
SkScalar inv = SkScalarInvert(sx);
// flip the skew elements to go from our Y-down system to FreeType's
fMatrix22.xx = SkScalarToFixed(SkScalarMul(m.getScaleX(), inv));
fMatrix22.xy = -SkScalarToFixed(SkScalarMul(m.getSkewX(), inv));
fMatrix22.yx = -SkScalarToFixed(SkScalarMul(m.getSkewY(), inv));
fMatrix22.yy = SkScalarToFixed(SkScalarMul(m.getScaleY(), inv));
} else {
fMatrix22.xx = fMatrix22.yy = SK_Fixed1;
fMatrix22.xy = fMatrix22.yx = 0;
}
fScaleX = SkScalarToFixed(sx);
fScaleY = SkScalarToFixed(sy);
// compute the flags we send to Load_Glyph
{
uint32_t flags = FT_LOAD_DEFAULT;
uint32_t render_flags = FT_LOAD_TARGET_NORMAL;
// we force autohinting at the moment
switch (fRec.fHints) {
case kNo_Hints:
flags |= FT_LOAD_NO_HINTING;
break;
case kSubpixel_Hints:
flags |= FT_LOAD_FORCE_AUTOHINT;
render_flags = FT_LOAD_TARGET_LIGHT;
break;
case kNormal_Hints:
flags |= FT_LOAD_FORCE_AUTOHINT;
#ifdef ANDROID
/* Switch to light hinting (vertical only) to address some chars
that behaved poorly with NORMAL. In the future we could consider
making this choice exposed at runtime to the caller.
*/
render_flags = FT_LOAD_TARGET_LIGHT;
#endif
break;
}
if (SkMask::kBW_Format == fRec.fMaskFormat)
render_flags = FT_LOAD_TARGET_MONO;
else if (SkMask::kLCD_Format == fRec.fMaskFormat)
render_flags = FT_LOAD_TARGET_LCD;
fLoadGlyphFlags = flags | render_flags;
}
// now create the FT_Size
{
FT_Error err;
err = FT_New_Size(fFace, &fFTSize);
if (err != 0) {
SkDEBUGF(("SkScalerContext_FreeType::FT_New_Size(%x): FT_Set_Char_Size(0x%x, 0x%x) returned 0x%x\n",
fFaceRec->fFontID, fScaleX, fScaleY, err));
fFace = NULL;
return;
}
err = FT_Activate_Size(fFTSize);
if (err != 0) {
SkDEBUGF(("SkScalerContext_FreeType::FT_Activate_Size(%x, 0x%x, 0x%x) returned 0x%x\n",
fFaceRec->fFontID, fScaleX, fScaleY, err));
fFTSize = NULL;
}
err = FT_Set_Char_Size( fFace,
SkFixedToFDot6(fScaleX), SkFixedToFDot6(fScaleY),
72, 72);
if (err != 0) {
SkDEBUGF(("SkScalerContext_FreeType::FT_Set_Char_Size(%x, 0x%x, 0x%x) returned 0x%x\n",
fFaceRec->fFontID, fScaleX, fScaleY, err));
fFace = NULL;
return;
}
FT_Set_Transform( fFace, &fMatrix22, NULL);
}
}
