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Diffstat (limited to 'gfx/thebes/gfxGDIFont.cpp')
| -rw-r--r-- | gfx/thebes/gfxGDIFont.cpp | 553 |
1 files changed, 553 insertions, 0 deletions
diff --git a/gfx/thebes/gfxGDIFont.cpp b/gfx/thebes/gfxGDIFont.cpp new file mode 100644 index 0000000000..2053b33727 --- /dev/null +++ b/gfx/thebes/gfxGDIFont.cpp @@ -0,0 +1,553 @@ +/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*- + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#include "gfxGDIFont.h" + +#include "mozilla/MemoryReporting.h" +#include "mozilla/Sprintf.h" +#include "mozilla/WindowsVersion.h" + +#include <algorithm> +#include "gfxWindowsPlatform.h" +#include "gfxContext.h" +#include "mozilla/Preferences.h" +#include "nsUnicodeProperties.h" +#include "gfxFontConstants.h" +#include "gfxHarfBuzzShaper.h" +#include "gfxTextRun.h" + +#include "cairo-win32.h" + +#define ROUND(x) floor((x) + 0.5) + +using namespace mozilla; +using namespace mozilla::gfx; +using namespace mozilla::unicode; + +gfxGDIFont::gfxGDIFont(GDIFontEntry* aFontEntry, const gfxFontStyle* aFontStyle, + AntialiasOption anAAOption) + : gfxFont(nullptr, aFontEntry, aFontStyle, anAAOption), + mFont(nullptr), + mMetrics(nullptr), + mIsBitmap(false), + mScriptCache(nullptr) { + mNeedsSyntheticBold = aFontStyle->NeedsSyntheticBold(aFontEntry); + + Initialize(); + + if (mFont) { + mUnscaledFont = aFontEntry->LookupUnscaledFont(mFont); + } +} + +gfxGDIFont::~gfxGDIFont() { + if (mFont) { + ::DeleteObject(mFont); + } + if (mScriptCache) { + ScriptFreeCache(&mScriptCache); + } + delete mMetrics; +} + +gfxFont* gfxGDIFont::CopyWithAntialiasOption(AntialiasOption anAAOption) const { + auto entry = static_cast<GDIFontEntry*>(mFontEntry.get()); + return new gfxGDIFont(entry, &mStyle, anAAOption); +} + +bool gfxGDIFont::ShapeText(DrawTarget* aDrawTarget, const char16_t* aText, + uint32_t aOffset, uint32_t aLength, Script aScript, + nsAtom* aLanguage, bool aVertical, + RoundingFlags aRounding, + gfxShapedText* aShapedText) { + if (!mIsValid) { + NS_WARNING("invalid font! expect incorrect text rendering"); + return false; + } + + return gfxFont::ShapeText(aDrawTarget, aText, aOffset, aLength, aScript, + aLanguage, aVertical, aRounding, aShapedText); +} + +already_AddRefed<ScaledFont> gfxGDIFont::GetScaledFont( + const TextRunDrawParams& aRunParams) { + if (ScaledFont* scaledFont = mAzureScaledFont) { + return do_AddRef(scaledFont); + } + + LOGFONT lf; + GetObject(GetHFONT(), sizeof(LOGFONT), &lf); + + RefPtr<ScaledFont> newScaledFont = Factory::CreateScaledFontForGDIFont( + &lf, GetUnscaledFont(), GetAdjustedSize()); + if (!newScaledFont) { + return nullptr; + } + + InitializeScaledFont(newScaledFont); + + if (mAzureScaledFont.compareExchange(nullptr, newScaledFont.get())) { + Unused << newScaledFont.forget(); + } + ScaledFont* scaledFont = mAzureScaledFont; + return do_AddRef(scaledFont); +} + +gfxFont::RunMetrics gfxGDIFont::Measure(const gfxTextRun* aTextRun, + uint32_t aStart, uint32_t aEnd, + BoundingBoxType aBoundingBoxType, + DrawTarget* aRefDrawTarget, + Spacing* aSpacing, + gfx::ShapedTextFlags aOrientation) { + gfxFont::RunMetrics metrics = + gfxFont::Measure(aTextRun, aStart, aEnd, aBoundingBoxType, aRefDrawTarget, + aSpacing, aOrientation); + + // if aBoundingBoxType is LOOSE_INK_EXTENTS + // and the underlying cairo font may be antialiased, + // we can't trust Windows to have considered all the pixels + // so we need to add "padding" to the bounds. + // (see bugs 475968, 439831, compare also bug 445087) + if (aBoundingBoxType == LOOSE_INK_EXTENTS && + mAntialiasOption != kAntialiasNone && metrics.mBoundingBox.Width() > 0) { + metrics.mBoundingBox.MoveByX(-aTextRun->GetAppUnitsPerDevUnit()); + metrics.mBoundingBox.SetWidth(metrics.mBoundingBox.Width() + + aTextRun->GetAppUnitsPerDevUnit() * 3); + } + + return metrics; +} + +void gfxGDIFont::Initialize() { + NS_ASSERTION(!mMetrics, "re-creating metrics? this will leak"); + + LOGFONTW logFont; + + if (mAdjustedSize == 0.0) { + mAdjustedSize = GetAdjustedSize(); + if (FontSizeAdjust::Tag(mStyle.sizeAdjustBasis) != + FontSizeAdjust::Tag::None) { + if (mStyle.sizeAdjust > 0.0 && mAdjustedSize > 0.0) { + // to implement font-size-adjust, we first create the "unadjusted" font + FillLogFont(logFont, mAdjustedSize); + mFont = ::CreateFontIndirectW(&logFont); + + // initialize its metrics so we can calculate size adjustment + Initialize(); + + // Unless the font was so small that GDI metrics rounded to zero, + // calculate the properly adjusted size, and then proceed + // to recreate mFont and recalculate metrics + if (mMetrics->emHeight > 0.0) { + gfxFloat aspect; + switch (FontSizeAdjust::Tag(mStyle.sizeAdjustBasis)) { + default: + MOZ_ASSERT_UNREACHABLE("unhandled sizeAdjustBasis?"); + aspect = 0.0; + break; + case FontSizeAdjust::Tag::ExHeight: + aspect = mMetrics->xHeight / mMetrics->emHeight; + break; + case FontSizeAdjust::Tag::CapHeight: + aspect = mMetrics->capHeight / mMetrics->emHeight; + break; + case FontSizeAdjust::Tag::ChWidth: { + gfxFloat advance = GetCharAdvance('0'); + aspect = advance > 0.0 ? advance / mMetrics->emHeight : 0.5; + break; + } + case FontSizeAdjust::Tag::IcWidth: + case FontSizeAdjust::Tag::IcHeight: { + bool vertical = FontSizeAdjust::Tag(mStyle.sizeAdjustBasis) == + FontSizeAdjust::Tag::IcHeight; + gfxFloat advance = GetCharAdvance(kWaterIdeograph, vertical); + aspect = advance > 0.0 ? advance / mMetrics->emHeight : 1.0; + break; + } + } + if (aspect > 0.0) { + // If we created a shaper above (to measure glyphs), discard it so + // we get a new one for the adjusted scaling. + delete mHarfBuzzShaper.exchange(nullptr); + mAdjustedSize = mStyle.GetAdjustedSize(aspect); + } + } + + // delete the temporary font and metrics + ::DeleteObject(mFont); + mFont = nullptr; + delete mMetrics; + mMetrics = nullptr; + } else { + mAdjustedSize = 0.0; + } + } + } + + // (bug 724231) for local user fonts, we don't use GDI's synthetic bold, + // as it could lead to a different, incompatible face being used + // but instead do our own multi-striking + if (mNeedsSyntheticBold && GetFontEntry()->IsLocalUserFont()) { + mApplySyntheticBold = true; + } + + // this may end up being zero + mAdjustedSize = ROUND(mAdjustedSize); + FillLogFont(logFont, mAdjustedSize); + mFont = ::CreateFontIndirectW(&logFont); + + mMetrics = new gfxFont::Metrics; + ::memset(mMetrics, 0, sizeof(*mMetrics)); + + if (!mFont) { + NS_WARNING("Failed creating GDI font"); + mIsValid = false; + return; + } + + AutoDC dc; + SetGraphicsMode(dc.GetDC(), GM_ADVANCED); + AutoSelectFont selectFont(dc.GetDC(), mFont); + + // Get font metrics if size > 0 + if (mAdjustedSize > 0.0) { + OUTLINETEXTMETRIC oMetrics; + TEXTMETRIC& metrics = oMetrics.otmTextMetrics; + + if (0 < GetOutlineTextMetrics(dc.GetDC(), sizeof(oMetrics), &oMetrics)) { + mMetrics->strikeoutSize = (double)oMetrics.otmsStrikeoutSize; + mMetrics->strikeoutOffset = (double)oMetrics.otmsStrikeoutPosition; + mMetrics->underlineSize = (double)oMetrics.otmsUnderscoreSize; + mMetrics->underlineOffset = (double)oMetrics.otmsUnderscorePosition; + + const MAT2 kIdentityMatrix = {{0, 1}, {0, 0}, {0, 0}, {0, 1}}; + GLYPHMETRICS gm; + DWORD len = GetGlyphOutlineW(dc.GetDC(), char16_t('x'), GGO_METRICS, &gm, + 0, nullptr, &kIdentityMatrix); + if (len == GDI_ERROR || gm.gmptGlyphOrigin.y <= 0) { + // 56% of ascent, best guess for true type + mMetrics->xHeight = + ROUND((double)metrics.tmAscent * DEFAULT_XHEIGHT_FACTOR); + } else { + mMetrics->xHeight = gm.gmptGlyphOrigin.y; + } + len = GetGlyphOutlineW(dc.GetDC(), char16_t('H'), GGO_METRICS, &gm, 0, + nullptr, &kIdentityMatrix); + if (len == GDI_ERROR || gm.gmptGlyphOrigin.y <= 0) { + mMetrics->capHeight = metrics.tmAscent - metrics.tmInternalLeading; + } else { + mMetrics->capHeight = gm.gmptGlyphOrigin.y; + } + mMetrics->emHeight = metrics.tmHeight - metrics.tmInternalLeading; + gfxFloat typEmHeight = + (double)oMetrics.otmAscent - (double)oMetrics.otmDescent; + mMetrics->emAscent = + ROUND(mMetrics->emHeight * (double)oMetrics.otmAscent / typEmHeight); + mMetrics->emDescent = mMetrics->emHeight - mMetrics->emAscent; + if (oMetrics.otmEMSquare > 0) { + mFUnitsConvFactor = float(mAdjustedSize / oMetrics.otmEMSquare); + } + } else { + // Make a best-effort guess at extended metrics + // this is based on general typographic guidelines + + // GetTextMetrics can fail if the font file has been removed + // or corrupted recently. + BOOL result = GetTextMetrics(dc.GetDC(), &metrics); + if (!result) { + NS_WARNING("Missing or corrupt font data, fasten your seatbelt"); + mIsValid = false; + memset(mMetrics, 0, sizeof(*mMetrics)); + return; + } + + mMetrics->xHeight = + ROUND((float)metrics.tmAscent * DEFAULT_XHEIGHT_FACTOR); + mMetrics->strikeoutSize = 1; + mMetrics->strikeoutOffset = + ROUND(mMetrics->xHeight * 0.5f); // 50% of xHeight + mMetrics->underlineSize = 1; + mMetrics->underlineOffset = + -ROUND((float)metrics.tmDescent * 0.30f); // 30% of descent + mMetrics->emHeight = metrics.tmHeight - metrics.tmInternalLeading; + mMetrics->emAscent = metrics.tmAscent - metrics.tmInternalLeading; + mMetrics->emDescent = metrics.tmDescent; + mMetrics->capHeight = mMetrics->emAscent; + } + + mMetrics->internalLeading = metrics.tmInternalLeading; + mMetrics->externalLeading = metrics.tmExternalLeading; + mMetrics->maxHeight = metrics.tmHeight; + mMetrics->maxAscent = metrics.tmAscent; + mMetrics->maxDescent = metrics.tmDescent; + mMetrics->maxAdvance = metrics.tmMaxCharWidth; + mMetrics->aveCharWidth = std::max<gfxFloat>(1, metrics.tmAveCharWidth); + // The font is monospace when TMPF_FIXED_PITCH is *not* set! + // See http://msdn2.microsoft.com/en-us/library/ms534202(VS.85).aspx + if (!(metrics.tmPitchAndFamily & TMPF_FIXED_PITCH)) { + mMetrics->maxAdvance = mMetrics->aveCharWidth; + } + + mIsBitmap = !(metrics.tmPitchAndFamily & TMPF_VECTOR); + + // For fonts with USE_TYPO_METRICS set in the fsSelection field, + // let the OS/2 sTypo* metrics override the previous values. + // (see http://www.microsoft.com/typography/otspec/os2.htm#fss) + // Using the equivalent values from oMetrics provides inconsistent + // results with CFF fonts, so we instead rely on OS2Table. + gfxFontEntry::AutoTable os2Table(mFontEntry, + TRUETYPE_TAG('O', 'S', '/', '2')); + if (os2Table) { + uint32_t len; + const OS2Table* os2 = + reinterpret_cast<const OS2Table*>(hb_blob_get_data(os2Table, &len)); + if (len >= offsetof(OS2Table, sTypoLineGap) + sizeof(int16_t)) { + const uint16_t kUseTypoMetricsMask = 1 << 7; + if ((uint16_t(os2->fsSelection) & kUseTypoMetricsMask)) { + double ascent = int16_t(os2->sTypoAscender); + double descent = int16_t(os2->sTypoDescender); + double lineGap = int16_t(os2->sTypoLineGap); + mMetrics->maxAscent = ROUND(ascent * mFUnitsConvFactor); + mMetrics->maxDescent = -ROUND(descent * mFUnitsConvFactor); + mMetrics->maxHeight = mMetrics->maxAscent + mMetrics->maxDescent; + mMetrics->internalLeading = mMetrics->maxHeight - mMetrics->emHeight; + gfxFloat lineHeight = + ROUND((ascent - descent + lineGap) * mFUnitsConvFactor); + lineHeight = std::max(lineHeight, mMetrics->maxHeight); + mMetrics->externalLeading = lineHeight - mMetrics->maxHeight; + } + } + // although sxHeight and sCapHeight are signed fields, we consider + // negative values to be erroneous and just ignore them + if (uint16_t(os2->version) >= 2) { + // version 2 and later includes the x-height and cap-height fields + if (len >= offsetof(OS2Table, sxHeight) + sizeof(int16_t) && + int16_t(os2->sxHeight) > 0) { + mMetrics->xHeight = ROUND(int16_t(os2->sxHeight) * mFUnitsConvFactor); + } + if (len >= offsetof(OS2Table, sCapHeight) + sizeof(int16_t) && + int16_t(os2->sCapHeight) > 0) { + mMetrics->capHeight = + ROUND(int16_t(os2->sCapHeight) * mFUnitsConvFactor); + } + } + } + + WORD glyph; + SIZE size; + DWORD ret = GetGlyphIndicesW(dc.GetDC(), L" ", 1, &glyph, + GGI_MARK_NONEXISTING_GLYPHS); + if (ret != GDI_ERROR && glyph != 0xFFFF) { + mSpaceGlyph = glyph; + // Cache the width of a single space. + GetTextExtentPoint32W(dc.GetDC(), L" ", 1, &size); + mMetrics->spaceWidth = ROUND(size.cx); + } else { + mMetrics->spaceWidth = mMetrics->aveCharWidth; + } + + // Cache the width of digit zero, if available. + ret = GetGlyphIndicesW(dc.GetDC(), L"0", 1, &glyph, + GGI_MARK_NONEXISTING_GLYPHS); + if (ret != GDI_ERROR && glyph != 0xFFFF) { + GetTextExtentPoint32W(dc.GetDC(), L"0", 1, &size); + mMetrics->zeroWidth = ROUND(size.cx); + } else { + mMetrics->zeroWidth = -1.0; // indicates not found + } + + wchar_t ch = kWaterIdeograph; + ret = GetGlyphIndicesW(dc.GetDC(), &ch, 1, &glyph, + GGI_MARK_NONEXISTING_GLYPHS); + if (ret != GDI_ERROR && glyph != 0xFFFF) { + GetTextExtentPoint32W(dc.GetDC(), &ch, 1, &size); + mMetrics->ideographicWidth = ROUND(size.cx); + } else { + mMetrics->ideographicWidth = -1.0; + } + + SanitizeMetrics(mMetrics, GetFontEntry()->mIsBadUnderlineFont); + } else { + mFUnitsConvFactor = 0.0; // zero-sized font: all values scale to zero + } + + if (ApplySyntheticBold()) { + auto delta = GetSyntheticBoldOffset(); + mMetrics->spaceWidth += delta; + mMetrics->aveCharWidth += delta; + mMetrics->maxAdvance += delta; + if (mMetrics->zeroWidth > 0) { + mMetrics->zeroWidth += delta; + } + if (mMetrics->ideographicWidth > 0) { + mMetrics->ideographicWidth += delta; + } + } + +#if 0 + printf("Font: %p (%s) size: %f adjusted size: %f valid: %s\n", this, + GetName().get(), mStyle.size, mAdjustedSize, (mIsValid ? "yes" : "no")); + 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\n", mMetrics->spaceWidth, mMetrics->aveCharWidth); + printf(" xHeight: %f capHeight: %f\n", mMetrics->xHeight, mMetrics->capHeight); + printf(" uOff: %f uSize: %f stOff: %f stSize: %f\n", + mMetrics->underlineOffset, mMetrics->underlineSize, mMetrics->strikeoutOffset, mMetrics->strikeoutSize); +#endif +} + +void gfxGDIFont::FillLogFont(LOGFONTW& aLogFont, gfxFloat aSize) { + GDIFontEntry* fe = static_cast<GDIFontEntry*>(GetFontEntry()); + + // Figure out the lfWeight value to use for GDI font selection, + // or zero to use the entry's current LOGFONT value. + LONG weight; + if (fe->IsUserFont()) { + if (fe->IsLocalUserFont()) { + // for local user fonts, don't change the original weight + // in the entry's logfont, because that could alter the + // choice of actual face used (bug 724231) + weight = 0; + } else { + // avoid GDI synthetic bold which occurs when weight + // specified is >= font data weight + 200 + weight = mNeedsSyntheticBold ? 700 : 200; + } + } else { + // GDI doesn't support variation fonts, so for system fonts we know + // that the entry has only a single weight, not a range. + MOZ_ASSERT(fe->Weight().IsSingle()); + weight = mNeedsSyntheticBold ? 700 : fe->Weight().Min().ToIntRounded(); + } + + fe->FillLogFont(&aLogFont, weight, aSize); +} + +uint32_t gfxGDIFont::GetGlyph(uint32_t aUnicode, uint32_t aVarSelector) { + // Callback used only for fonts that lack a 'cmap' table. + + // We don't support variation selector sequences or non-BMP characters + // in the legacy bitmap, vector or postscript fonts that might use + // this code path. + if (aUnicode > 0xffff || aVarSelector) { + return 0; + } + + if (!mGlyphIDs) { + mGlyphIDs = MakeUnique<nsTHashMap<nsUint32HashKey, uint32_t>>(64); + } + + uint32_t gid; + if (mGlyphIDs->Get(aUnicode, &gid)) { + return gid; + } + + wchar_t ch = aUnicode; + WORD glyph; + HRESULT ret = ScriptGetCMap(nullptr, &mScriptCache, &ch, 1, 0, &glyph); + if (ret != S_OK) { + AutoDC dc; + AutoSelectFont fs(dc.GetDC(), GetHFONT()); + if (ret == E_PENDING) { + // Try ScriptGetCMap again now that we've set up the font. + ret = ScriptGetCMap(dc.GetDC(), &mScriptCache, &ch, 1, 0, &glyph); + } + if (ret != S_OK) { + // If ScriptGetCMap still failed, fall back to GetGlyphIndicesW + // (see bug 1105807). + DWORD ret = GetGlyphIndicesW(dc.GetDC(), &ch, 1, &glyph, + GGI_MARK_NONEXISTING_GLYPHS); + if (ret == GDI_ERROR || glyph == 0xFFFF) { + glyph = 0; + } + } + } + + mGlyphIDs->InsertOrUpdate(aUnicode, glyph); + return glyph; +} + +int32_t gfxGDIFont::GetGlyphWidth(uint16_t aGID) { + if (!mGlyphWidths) { + mGlyphWidths = MakeUnique<nsTHashMap<nsUint32HashKey, int32_t>>(128); + } + + return mGlyphWidths->WithEntryHandle(aGID, [&](auto&& entry) { + if (!entry) { + DCForMetrics dc; + AutoSelectFont fs(dc, GetHFONT()); + + int devWidth; + if (!GetCharWidthI(dc, aGID, 1, nullptr, &devWidth)) { + return -1; + } + // clamp value to range [0..0x7fff], and convert to 16.16 fixed-point + devWidth = std::min(std::max(0, devWidth), 0x7fff); + entry.Insert(devWidth << 16); + } + return *entry; + }); +} + +bool gfxGDIFont::GetGlyphBounds(uint16_t aGID, gfxRect* aBounds, bool aTight) { + DCForMetrics dc; + AutoSelectFont fs(dc, GetHFONT()); + + if (mIsBitmap) { + int devWidth; + if (!GetCharWidthI(dc, aGID, 1, nullptr, &devWidth)) { + return false; + } + devWidth = std::min(std::max(0, devWidth), 0x7fff); + + *aBounds = gfxRect(0, -mMetrics->maxAscent, devWidth, + mMetrics->maxAscent + mMetrics->maxDescent); + return true; + } + + const MAT2 kIdentityMatrix = {{0, 1}, {0, 0}, {0, 0}, {0, 1}}; + GLYPHMETRICS gm; + if (GetGlyphOutlineW(dc, aGID, GGO_METRICS | GGO_GLYPH_INDEX, &gm, 0, nullptr, + &kIdentityMatrix) == GDI_ERROR) { + return false; + } + + if (gm.gmBlackBoxX == 1 && gm.gmBlackBoxY == 1 && + !GetGlyphOutlineW(dc, aGID, GGO_NATIVE | GGO_GLYPH_INDEX, &gm, 0, nullptr, + &kIdentityMatrix)) { + // Workaround for GetGlyphOutline returning 1x1 bounding box + // for <space> glyph that is in fact empty. + gm.gmBlackBoxX = 0; + gm.gmBlackBoxY = 0; + } else if (gm.gmBlackBoxX > 0 && !aTight) { + // The bounding box reported by Windows supposedly contains the glyph's + // "black" area; however, antialiasing (especially with ClearType) means + // that the actual image that needs to be rendered may "bleed" into the + // adjacent pixels, mainly on the right side. + gm.gmptGlyphOrigin.x -= 1; + gm.gmBlackBoxX += 3; + } + + *aBounds = gfxRect(gm.gmptGlyphOrigin.x, -gm.gmptGlyphOrigin.y, + gm.gmBlackBoxX, gm.gmBlackBoxY); + return true; +} + +void gfxGDIFont::AddSizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf, + FontCacheSizes* aSizes) const { + gfxFont::AddSizeOfExcludingThis(aMallocSizeOf, aSizes); + aSizes->mFontInstances += aMallocSizeOf(mMetrics); + if (mGlyphWidths) { + aSizes->mFontInstances += + mGlyphWidths->ShallowSizeOfIncludingThis(aMallocSizeOf); + } +} + +void gfxGDIFont::AddSizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf, + FontCacheSizes* aSizes) const { + aSizes->mFontInstances += aMallocSizeOf(this); + AddSizeOfExcludingThis(aMallocSizeOf, aSizes); +} |