static void
WriteDumpFile(FILE* aDumpFile, AudioStream* aStream, PRUint32 aFrames,
void* aBuffer)
{
if (!aDumpFile)
return;
PRUint32 samples = aStream->GetChannels()*aFrames;
if (AUDIO_OUTPUT_FORMAT == AUDIO_FORMAT_S16) {
fwrite(aBuffer, 2, samples, aDumpFile);
return;
}
NS_ASSERTION(AUDIO_OUTPUT_FORMAT == AUDIO_FORMAT_FLOAT32, "bad format");
nsAutoTArray<PRUint8, 1024*2> buf;
buf.SetLength(samples*2);
float* input = static_cast<float*>(aBuffer);
PRUint8* output = buf.Elements();
for (PRUint32 i = 0; i < samples; ++i) {
SetUint16LE(output + i*2, PRInt16(input[i]*32767.0f));
}
fwrite(output, 2, samples, aDumpFile);
fflush(aDumpFile);
}
void
gfxDWriteFont::ComputeMetrics()
{
DWRITE_FONT_METRICS fontMetrics;
mFontFace->GetMetrics(&fontMetrics);
if (mStyle.sizeAdjust != 0.0) {
gfxFloat aspect = (gfxFloat)fontMetrics.xHeight /
fontMetrics.designUnitsPerEm;
mAdjustedSize = mStyle.GetAdjustedSize(aspect);
} else {
mAdjustedSize = mStyle.size;
}
mMetrics.xHeight =
((gfxFloat)fontMetrics.xHeight /
fontMetrics.designUnitsPerEm) * mAdjustedSize;
mMetrics.maxAscent =
ceil(((gfxFloat)fontMetrics.ascent /
fontMetrics.designUnitsPerEm) * mAdjustedSize);
mMetrics.maxDescent =
ceil(((gfxFloat)fontMetrics.descent /
fontMetrics.designUnitsPerEm) * mAdjustedSize);
mMetrics.maxHeight = mMetrics.maxAscent + mMetrics.maxDescent;
mMetrics.emHeight = mAdjustedSize;
mMetrics.emAscent = mMetrics.emHeight *
mMetrics.maxAscent / mMetrics.maxHeight;
mMetrics.emDescent = mMetrics.emHeight - mMetrics.emAscent;
mMetrics.maxAdvance = mAdjustedSize;
// try to get the true maxAdvance value from 'hhea'
PRUint8 *tableData;
PRUint32 len;
void *tableContext = NULL;
BOOL exists;
HRESULT hr =
mFontFace->TryGetFontTable(DWRITE_MAKE_OPENTYPE_TAG('h', 'h', 'e', 'a'),
(const void**)&tableData,
&len,
&tableContext,
&exists);
if (SUCCEEDED(hr)) {
if (exists && len >= sizeof(mozilla::HheaTable)) {
const mozilla::HheaTable* hhea =
reinterpret_cast<const mozilla::HheaTable*>(tableData);
mMetrics.maxAdvance = ((gfxFloat)PRUint16(hhea->advanceWidthMax) /
fontMetrics.designUnitsPerEm) * mAdjustedSize;
}
mFontFace->ReleaseFontTable(tableContext);
}
mMetrics.internalLeading =
ceil(((gfxFloat)(fontMetrics.ascent +
fontMetrics.descent -
fontMetrics.designUnitsPerEm) /
fontMetrics.designUnitsPerEm) * mAdjustedSize);
mMetrics.externalLeading =
ceil(((gfxFloat)fontMetrics.lineGap /
fontMetrics.designUnitsPerEm) * mAdjustedSize);
UINT16 glyph = (PRUint16)GetSpaceGlyph();
DWRITE_GLYPH_METRICS metrics;
mFontFace->GetDesignGlyphMetrics(&glyph, 1, &metrics);
mMetrics.spaceWidth =
((gfxFloat)metrics.advanceWidth /
fontMetrics.designUnitsPerEm) * mAdjustedSize;
// try to get aveCharWidth from the OS/2 table, fall back to measuring 'x'
// if the table is not available
mMetrics.aveCharWidth = 0;
hr = mFontFace->TryGetFontTable(DWRITE_MAKE_OPENTYPE_TAG('O', 'S', '/', '2'),
(const void**)&tableData,
&len,
&tableContext,
&exists);
if (SUCCEEDED(hr)) {
if (exists && len >= 4) {
// Not checking against sizeof(mozilla::OS2Table) here because older
// versions of the table have different sizes; we only need the first
// two 16-bit fields here.
const mozilla::OS2Table* os2 =
reinterpret_cast<const mozilla::OS2Table*>(tableData);
mMetrics.aveCharWidth = ((gfxFloat)PRInt16(os2->xAvgCharWidth) /
fontMetrics.designUnitsPerEm) * mAdjustedSize;
}
mFontFace->ReleaseFontTable(tableContext);
}
UINT32 ucs;
if (mMetrics.aveCharWidth < 1) {
ucs = L'x';
if (SUCCEEDED(mFontFace->GetGlyphIndicesA(&ucs, 1, &glyph)) &&
SUCCEEDED(mFontFace->GetDesignGlyphMetrics(&glyph, 1, &metrics))) {
mMetrics.aveCharWidth =
((gfxFloat)metrics.advanceWidth /
fontMetrics.designUnitsPerEm) * mAdjustedSize;
} else {
// Let's just assume the X is square.
mMetrics.aveCharWidth =
((gfxFloat)fontMetrics.xHeight /
fontMetrics.designUnitsPerEm) * mAdjustedSize;
}
}
ucs = L'0';
if (SUCCEEDED(mFontFace->GetGlyphIndicesA(&ucs, 1, &glyph)) &&
SUCCEEDED(mFontFace->GetDesignGlyphMetrics(&glyph, 1, &metrics))) {
mMetrics.zeroOrAveCharWidth =
((gfxFloat)metrics.advanceWidth /
fontMetrics.designUnitsPerEm) * mAdjustedSize;
} else {
mMetrics.zeroOrAveCharWidth = mMetrics.aveCharWidth;
}
mMetrics.underlineOffset =
((gfxFloat)fontMetrics.underlinePosition /
fontMetrics.designUnitsPerEm) * mAdjustedSize;
mMetrics.underlineSize =
((gfxFloat)fontMetrics.underlineThickness /
fontMetrics.designUnitsPerEm) * mAdjustedSize;
mMetrics.strikeoutOffset =
((gfxFloat)fontMetrics.strikethroughPosition /
fontMetrics.designUnitsPerEm) * mAdjustedSize;
mMetrics.strikeoutSize =
((gfxFloat)fontMetrics.strikethroughThickness /
fontMetrics.designUnitsPerEm) * mAdjustedSize;
mMetrics.superscriptOffset = 0;
mMetrics.subscriptOffset = 0;
mFUnitsConvFactor = GetAdjustedSize() / fontMetrics.designUnitsPerEm;
SanitizeMetrics(&mMetrics, GetFontEntry()->mIsBadUnderlineFont);
#if 0
printf("Font: %p (%s) size: %f\n", this,
NS_ConvertUTF16toUTF8(GetName()).get(), mStyle.size);
printf(" emHeight: %f emAscent: %f emDescent: %f\n", mMetrics.emHeight, mMetrics.emAscent, mMetrics.emDescent);
printf(" maxAscent: %f maxDescent: %f maxAdvance: %f\n", mMetrics.maxAscent, mMetrics.maxDescent, mMetrics.maxAdvance);
printf(" internalLeading: %f externalLeading: %f\n", mMetrics.internalLeading, mMetrics.externalLeading);
printf(" spaceWidth: %f aveCharWidth: %f zeroOrAve: %f xHeight: %f\n",
mMetrics.spaceWidth, mMetrics.aveCharWidth, mMetrics.zeroOrAveCharWidth, mMetrics.xHeight);
printf(" uOff: %f uSize: %f stOff: %f stSize: %f supOff: %f subOff: %f\n",
mMetrics.underlineOffset, mMetrics.underlineSize, mMetrics.strikeoutOffset, mMetrics.strikeoutSize,
mMetrics.superscriptOffset, mMetrics.subscriptOffset);
#endif
}