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Diffstat (limited to 'gfx/thebes/gfxDWriteFonts.cpp')
| -rw-r--r-- | gfx/thebes/gfxDWriteFonts.cpp | 847 |
1 files changed, 847 insertions, 0 deletions
diff --git a/gfx/thebes/gfxDWriteFonts.cpp b/gfx/thebes/gfxDWriteFonts.cpp new file mode 100644 index 0000000000..fa6bc48cf9 --- /dev/null +++ b/gfx/thebes/gfxDWriteFonts.cpp @@ -0,0 +1,847 @@ +/* -*- 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 "gfxDWriteFonts.h" + +#include <algorithm> +#include "gfxDWriteFontList.h" +#include "gfxContext.h" +#include "gfxHarfBuzzShaper.h" +#include "gfxTextRun.h" +#include "mozilla/gfx/2D.h" +#include "mozilla/gfx/DWriteSettings.h" +#include "mozilla/gfx/Logging.h" +#include "mozilla/gfx/gfxVars.h" +#include "mozilla/Preferences.h" + +#include "harfbuzz/hb.h" +#include "mozilla/FontPropertyTypes.h" + +using namespace mozilla; +using namespace mozilla::gfx; + +// Code to determine whether Windows is set to use ClearType font smoothing; +// based on private functions in cairo-win32-font.c + +#ifndef SPI_GETFONTSMOOTHINGTYPE +# define SPI_GETFONTSMOOTHINGTYPE 0x200a +#endif +#ifndef FE_FONTSMOOTHINGCLEARTYPE +# define FE_FONTSMOOTHINGCLEARTYPE 2 +#endif + +// Cleartype can be dynamically enabled/disabled, so we have to allow for +// dynamically updating it. +static BYTE GetSystemTextQuality() { + BOOL font_smoothing; + UINT smoothing_type; + + if (!SystemParametersInfo(SPI_GETFONTSMOOTHING, 0, &font_smoothing, 0)) { + return DEFAULT_QUALITY; + } + + if (font_smoothing) { + if (!SystemParametersInfo(SPI_GETFONTSMOOTHINGTYPE, 0, &smoothing_type, + 0)) { + return DEFAULT_QUALITY; + } + + if (smoothing_type == FE_FONTSMOOTHINGCLEARTYPE) { + return CLEARTYPE_QUALITY; + } + + return ANTIALIASED_QUALITY; + } + + return DEFAULT_QUALITY; +} + +#ifndef SPI_GETFONTSMOOTHINGCONTRAST +# define SPI_GETFONTSMOOTHINGCONTRAST 0x200c +#endif + +// "Retrieves a contrast value that is used in ClearType smoothing. Valid +// contrast values are from 1000 to 2200. The default value is 1400." +static FLOAT GetSystemGDIGamma() { + UINT value = 0; + if (!SystemParametersInfo(SPI_GETFONTSMOOTHINGCONTRAST, 0, &value, 0) || + value < 1000 || value > 2200) { + value = 1400; + } + return value / 1000.0f; +} + +//////////////////////////////////////////////////////////////////////////////// +// gfxDWriteFont +gfxDWriteFont::gfxDWriteFont(const RefPtr<UnscaledFontDWrite>& aUnscaledFont, + gfxFontEntry* aFontEntry, + const gfxFontStyle* aFontStyle, + RefPtr<IDWriteFontFace> aFontFace, + AntialiasOption anAAOption) + : gfxFont(aUnscaledFont, aFontEntry, aFontStyle, anAAOption), + mFontFace(aFontFace ? aFontFace : aUnscaledFont->GetFontFace()), + mUseSubpixelPositions(false), + mAllowManualShowGlyphs(true), + mAzureScaledFontUsedClearType(false) { + // If the IDWriteFontFace1 interface is available, we can use that for + // faster glyph width retrieval. + mFontFace->QueryInterface(__uuidof(IDWriteFontFace1), + (void**)getter_AddRefs(mFontFace1)); + // If a fake-bold effect is needed, determine whether we're using DWrite's + // "simulation" or applying our multi-strike "synthetic bold". + if (aFontStyle->NeedsSyntheticBold(aFontEntry)) { + switch (StaticPrefs::gfx_font_rendering_directwrite_bold_simulation()) { + case 0: // never use the DWrite simulation + mApplySyntheticBold = true; + break; + case 1: // use DWrite simulation for installed fonts but not webfonts + mApplySyntheticBold = aFontEntry->mIsDataUserFont; + break; + default: // always use DWrite bold simulation + // the flag is initialized to false in gfxFont + break; + } + } + ComputeMetrics(anAAOption); +} + +gfxDWriteFont::~gfxDWriteFont() { + if (auto* scaledFont = mAzureScaledFontGDI.exchange(nullptr)) { + scaledFont->Release(); + } +} + +/* static */ +bool gfxDWriteFont::InitDWriteSupport() { + if (!Factory::EnsureDWriteFactory()) { + return false; + } + + if (XRE_IsParentProcess()) { + UpdateSystemTextVars(); + } else { + // UpdateClearTypeVars doesn't update the vars in non parent processes, but + // it does set sForceGDIClassicEnabled so we still need to call it. + UpdateClearTypeVars(); + } + DWriteSettings::Initialize(); + + return true; +} + +/* static */ +void gfxDWriteFont::UpdateSystemTextVars() { + MOZ_ASSERT(XRE_IsParentProcess()); + + if (!gfxVars::IsInitialized()) { + return; + } + + BYTE newQuality = GetSystemTextQuality(); + if (gfxVars::SystemTextQuality() != newQuality) { + gfxVars::SetSystemTextQuality(newQuality); + } + + FLOAT newGDIGamma = GetSystemGDIGamma(); + if (gfxVars::SystemGDIGamma() != newGDIGamma) { + gfxVars::SetSystemGDIGamma(newGDIGamma); + } + + UpdateClearTypeVars(); +} + +void gfxDWriteFont::SystemTextQualityChanged() { + // If ClearType status has changed, update our value, + Factory::SetSystemTextQuality(gfxVars::SystemTextQuality()); + // flush cached stuff that depended on the old setting, and force + // reflow everywhere to ensure we are using correct glyph metrics. + gfxPlatform::FlushFontAndWordCaches(); + gfxPlatform::ForceGlobalReflow(gfxPlatform::NeedsReframe::No); +} + +mozilla::Atomic<bool> gfxDWriteFont::sForceGDIClassicEnabled{true}; + +/* static */ +void gfxDWriteFont::UpdateClearTypeVars() { + // We don't force GDI classic if the cleartype rendering mode pref is set to + // something valid. + int32_t renderingModePref = + Preferences::GetInt(GFX_CLEARTYPE_PARAMS_MODE, -1); + if (renderingModePref < 0 || renderingModePref > 5) { + renderingModePref = -1; + } + sForceGDIClassicEnabled = (renderingModePref == -1); + + if (!XRE_IsParentProcess()) { + return; + } + + if (!Factory::GetDWriteFactory()) { + return; + } + + // First set sensible hard coded defaults. + float clearTypeLevel = 1.0f; + float enhancedContrast = 1.0f; + float gamma = 2.2f; + int pixelGeometry = DWRITE_PIXEL_GEOMETRY_RGB; + int renderingMode = DWRITE_RENDERING_MODE_DEFAULT; + + // Override these from DWrite function if available. + RefPtr<IDWriteRenderingParams> defaultRenderingParams; + HRESULT hr = Factory::GetDWriteFactory()->CreateRenderingParams( + getter_AddRefs(defaultRenderingParams)); + if (SUCCEEDED(hr) && defaultRenderingParams) { + clearTypeLevel = defaultRenderingParams->GetClearTypeLevel(); + + // For enhanced contrast, we only use the default if the user has set it + // in the registry (by using the ClearType Tuner). + // XXXbobowen it seems slightly odd that we do this and only for enhanced + // contrast, but this reproduces previous functionality from + // gfxWindowsPlatform::SetupClearTypeParams. + HKEY hKey; + LONG res = RegOpenKeyExW(DISPLAY1_REGISTRY_KEY, 0, KEY_READ, &hKey); + if (res == ERROR_SUCCESS) { + res = RegQueryValueExW(hKey, ENHANCED_CONTRAST_VALUE_NAME, nullptr, + nullptr, nullptr, nullptr); + if (res == ERROR_SUCCESS) { + enhancedContrast = defaultRenderingParams->GetEnhancedContrast(); + } + RegCloseKey(hKey); + } + + gamma = defaultRenderingParams->GetGamma(); + pixelGeometry = defaultRenderingParams->GetPixelGeometry(); + renderingMode = defaultRenderingParams->GetRenderingMode(); + } else { + gfxWarning() << "Failed to create default rendering params"; + } + + // Finally override from prefs if valid values are set. If ClearType is + // turned off we just use the default params, this reproduces the previous + // functionality that was spread across gfxDWriteFont::GetScaledFont and + // gfxWindowsPlatform::SetupClearTypeParams, but it seems odd because the + // default params will still be the ClearType ones although we won't use the + // anti-alias for ClearType because of GetSystemDefaultAAMode. + if (gfxVars::SystemTextQuality() == CLEARTYPE_QUALITY) { + int32_t prefInt = Preferences::GetInt(GFX_CLEARTYPE_PARAMS_LEVEL, -1); + if (prefInt >= 0 && prefInt <= 100) { + clearTypeLevel = float(prefInt / 100.0); + } + + prefInt = Preferences::GetInt(GFX_CLEARTYPE_PARAMS_CONTRAST, -1); + if (prefInt >= 0 && prefInt <= 1000) { + enhancedContrast = float(prefInt / 100.0); + } + + prefInt = Preferences::GetInt(GFX_CLEARTYPE_PARAMS_GAMMA, -1); + if (prefInt >= 1000 && prefInt <= 2200) { + gamma = float(prefInt / 1000.0); + } + + prefInt = Preferences::GetInt(GFX_CLEARTYPE_PARAMS_STRUCTURE, -1); + if (prefInt >= 0 && prefInt <= 2) { + pixelGeometry = prefInt; + } + + // renderingModePref is retrieved and validated above. + if (renderingModePref != -1) { + renderingMode = renderingModePref; + } + } + + if (gfxVars::SystemTextClearTypeLevel() != clearTypeLevel) { + gfxVars::SetSystemTextClearTypeLevel(clearTypeLevel); + } + + if (gfxVars::SystemTextEnhancedContrast() != enhancedContrast) { + gfxVars::SetSystemTextEnhancedContrast(enhancedContrast); + } + + if (gfxVars::SystemTextGamma() != gamma) { + gfxVars::SetSystemTextGamma(gamma); + } + + if (gfxVars::SystemTextPixelGeometry() != pixelGeometry) { + gfxVars::SetSystemTextPixelGeometry(pixelGeometry); + } + + if (gfxVars::SystemTextRenderingMode() != renderingMode) { + gfxVars::SetSystemTextRenderingMode(renderingMode); + } + + // Set cairo dwrite params in the parent process where it might still be + // needed for printing. We use the validated pref int directly for rendering + // mode, because a negative (i.e. not set) rendering mode is also used for + // deciding on forcing GDI in cairo. + cairo_dwrite_set_cleartype_params(gamma, enhancedContrast, clearTypeLevel, + pixelGeometry, renderingModePref); +} + +gfxFont* gfxDWriteFont::CopyWithAntialiasOption( + AntialiasOption anAAOption) const { + auto entry = static_cast<gfxDWriteFontEntry*>(mFontEntry.get()); + RefPtr<UnscaledFontDWrite> unscaledFont = + static_cast<UnscaledFontDWrite*>(mUnscaledFont.get()); + return new gfxDWriteFont(unscaledFont, entry, &mStyle, mFontFace, anAAOption); +} + +bool gfxDWriteFont::GetFakeMetricsForArialBlack( + DWRITE_FONT_METRICS* aFontMetrics) { + gfxFontStyle style(mStyle); + style.weight = FontWeight::FromInt(700); + + gfxFontEntry* fe = gfxPlatformFontList::PlatformFontList()->FindFontForFamily( + nullptr, "Arial"_ns, &style); + if (!fe || fe == mFontEntry) { + return false; + } + + RefPtr<gfxFont> font = fe->FindOrMakeFont(&style); + gfxDWriteFont* dwFont = static_cast<gfxDWriteFont*>(font.get()); + dwFont->mFontFace->GetMetrics(aFontMetrics); + + return true; +} + +void gfxDWriteFont::ComputeMetrics(AntialiasOption anAAOption) { + ::memset(&mMetrics, 0, sizeof(mMetrics)); + + DWRITE_FONT_METRICS fontMetrics; + if (!(mFontEntry->Weight().Min() == FontWeight::FromInt(900) && + mFontEntry->Weight().Max() == FontWeight::FromInt(900) && + !mFontEntry->IsUserFont() && + mFontEntry->Name().EqualsLiteral("Arial Black") && + GetFakeMetricsForArialBlack(&fontMetrics))) { + mFontFace->GetMetrics(&fontMetrics); + } + + if (GetAdjustedSize() > 0.0 && mStyle.sizeAdjust >= 0.0 && + FontSizeAdjust::Tag(mStyle.sizeAdjustBasis) != + FontSizeAdjust::Tag::None) { + // For accurate measurement during the font-size-adjust computations; + // these may be reset later according to the adjusted size. + mUseSubpixelPositions = true; + mFUnitsConvFactor = float(mAdjustedSize / fontMetrics.designUnitsPerEm); + gfxFloat aspect; + switch (FontSizeAdjust::Tag(mStyle.sizeAdjustBasis)) { + default: + MOZ_ASSERT_UNREACHABLE("unhandled sizeAdjustBasis?"); + aspect = 0.0; + break; + case FontSizeAdjust::Tag::ExHeight: + aspect = (gfxFloat)fontMetrics.xHeight / fontMetrics.designUnitsPerEm; + break; + case FontSizeAdjust::Tag::CapHeight: + aspect = (gfxFloat)fontMetrics.capHeight / fontMetrics.designUnitsPerEm; + break; + case FontSizeAdjust::Tag::ChWidth: { + gfxFloat advance = GetCharAdvance('0'); + aspect = advance > 0.0 ? advance / mAdjustedSize : 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 / mAdjustedSize : 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); + } + } + + // Update now that we've adjusted the size if necessary. + mFUnitsConvFactor = float(mAdjustedSize / fontMetrics.designUnitsPerEm); + + // Note that GetMeasuringMode depends on mAdjustedSize + if ((anAAOption == gfxFont::kAntialiasDefault && UsingClearType() && + GetMeasuringMode() == DWRITE_MEASURING_MODE_NATURAL) || + anAAOption == gfxFont::kAntialiasSubpixel) { + mUseSubpixelPositions = true; + // note that this may be reset to FALSE if we determine that a bitmap + // strike is going to be used + } else { + mUseSubpixelPositions = false; + } + + gfxDWriteFontEntry* fe = static_cast<gfxDWriteFontEntry*>(mFontEntry.get()); + if (fe->IsCJKFont() && HasBitmapStrikeForSize(NS_lround(mAdjustedSize))) { + mAdjustedSize = NS_lround(mAdjustedSize); + mUseSubpixelPositions = false; + // if we have bitmaps, we need to tell Cairo NOT to use subpixel AA, + // to avoid the manual-subpixel codepath in cairo-d2d-surface.cpp + // which fails to render bitmap glyphs (see bug 626299). + // This option will be passed to the cairo_dwrite_scaled_font_t + // after creation. + mAllowManualShowGlyphs = false; + } + + mMetrics.xHeight = fontMetrics.xHeight * mFUnitsConvFactor; + mMetrics.capHeight = fontMetrics.capHeight * mFUnitsConvFactor; + + mMetrics.maxAscent = round(fontMetrics.ascent * mFUnitsConvFactor); + mMetrics.maxDescent = round(fontMetrics.descent * mFUnitsConvFactor); + 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' + gfxFontEntry::AutoTable hheaTable(GetFontEntry(), + TRUETYPE_TAG('h', 'h', 'e', 'a')); + if (hheaTable) { + uint32_t len; + const MetricsHeader* hhea = reinterpret_cast<const MetricsHeader*>( + hb_blob_get_data(hheaTable, &len)); + if (len >= sizeof(MetricsHeader)) { + mMetrics.maxAdvance = uint16_t(hhea->advanceWidthMax) * mFUnitsConvFactor; + } + } + + mMetrics.internalLeading = + std::max(mMetrics.maxHeight - mMetrics.emHeight, 0.0); + mMetrics.externalLeading = ceil(fontMetrics.lineGap * mFUnitsConvFactor); + + UINT32 ucs = L' '; + UINT16 glyph; + if (SUCCEEDED(mFontFace->GetGlyphIndices(&ucs, 1, &glyph)) && glyph != 0) { + mSpaceGlyph = glyph; + mMetrics.spaceWidth = MeasureGlyphWidth(glyph); + } else { + mMetrics.spaceWidth = 0; + } + + // try to get aveCharWidth from the OS/2 table, fall back to measuring 'x' + // if the table is not available or if using hinted/pixel-snapped widths + if (mUseSubpixelPositions) { + mMetrics.aveCharWidth = 0; + gfxFontEntry::AutoTable os2Table(GetFontEntry(), + 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 >= 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. + mMetrics.aveCharWidth = int16_t(os2->xAvgCharWidth) * mFUnitsConvFactor; + } + } + } + + if (mMetrics.aveCharWidth < 1) { + mMetrics.aveCharWidth = GetCharAdvance('x'); + if (mMetrics.aveCharWidth < 1) { + // Let's just assume the X is square. + mMetrics.aveCharWidth = fontMetrics.xHeight * mFUnitsConvFactor; + } + } + + mMetrics.zeroWidth = GetCharAdvance('0'); + + mMetrics.ideographicWidth = GetCharAdvance(kWaterIdeograph); + + mMetrics.underlineOffset = fontMetrics.underlinePosition * mFUnitsConvFactor; + mMetrics.underlineSize = fontMetrics.underlineThickness * mFUnitsConvFactor; + mMetrics.strikeoutOffset = + fontMetrics.strikethroughPosition * mFUnitsConvFactor; + mMetrics.strikeoutSize = + fontMetrics.strikethroughThickness * mFUnitsConvFactor; + + SanitizeMetrics(&mMetrics, GetFontEntry()->mIsBadUnderlineFont); + + 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\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 zeroWidth: %f\n", + mMetrics.spaceWidth, mMetrics.aveCharWidth, mMetrics.zeroWidth); + 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 +} + +using namespace mozilla; // for AutoSwap_* types + +struct EBLCHeader { + AutoSwap_PRUint32 version; + AutoSwap_PRUint32 numSizes; +}; + +struct SbitLineMetrics { + int8_t ascender; + int8_t descender; + uint8_t widthMax; + int8_t caretSlopeNumerator; + int8_t caretSlopeDenominator; + int8_t caretOffset; + int8_t minOriginSB; + int8_t minAdvanceSB; + int8_t maxBeforeBL; + int8_t minAfterBL; + int8_t pad1; + int8_t pad2; +}; + +struct BitmapSizeTable { + AutoSwap_PRUint32 indexSubTableArrayOffset; + AutoSwap_PRUint32 indexTablesSize; + AutoSwap_PRUint32 numberOfIndexSubTables; + AutoSwap_PRUint32 colorRef; + SbitLineMetrics hori; + SbitLineMetrics vert; + AutoSwap_PRUint16 startGlyphIndex; + AutoSwap_PRUint16 endGlyphIndex; + uint8_t ppemX; + uint8_t ppemY; + uint8_t bitDepth; + uint8_t flags; +}; + +typedef EBLCHeader EBSCHeader; + +struct BitmapScaleTable { + SbitLineMetrics hori; + SbitLineMetrics vert; + uint8_t ppemX; + uint8_t ppemY; + uint8_t substitutePpemX; + uint8_t substitutePpemY; +}; + +bool gfxDWriteFont::HasBitmapStrikeForSize(uint32_t aSize) { + uint8_t* tableData; + uint32_t len; + void* tableContext; + BOOL exists; + HRESULT hr = mFontFace->TryGetFontTable( + DWRITE_MAKE_OPENTYPE_TAG('E', 'B', 'L', 'C'), (const void**)&tableData, + &len, &tableContext, &exists); + if (FAILED(hr)) { + return false; + } + + bool hasStrike = false; + // not really a loop, but this lets us use 'break' to skip out of the block + // as soon as we know the answer, and skips it altogether if the table is + // not present + while (exists) { + if (len < sizeof(EBLCHeader)) { + break; + } + const EBLCHeader* hdr = reinterpret_cast<const EBLCHeader*>(tableData); + if (hdr->version != 0x00020000) { + break; + } + uint32_t numSizes = hdr->numSizes; + if (numSizes > 0xffff) { // sanity-check, prevent overflow below + break; + } + if (len < sizeof(EBLCHeader) + numSizes * sizeof(BitmapSizeTable)) { + break; + } + const BitmapSizeTable* sizeTable = + reinterpret_cast<const BitmapSizeTable*>(hdr + 1); + for (uint32_t i = 0; i < numSizes; ++i, ++sizeTable) { + if (sizeTable->ppemX == aSize && sizeTable->ppemY == aSize) { + // we ignore a strike that contains fewer than 4 glyphs, + // as that probably indicates a font such as Courier New + // that provides bitmaps ONLY for the "shading" characters + // U+2591..2593 + hasStrike = (uint16_t(sizeTable->endGlyphIndex) >= + uint16_t(sizeTable->startGlyphIndex) + 3); + break; + } + } + // if we reach here, we didn't find a strike; unconditionally break + // out of the while-loop block + break; + } + mFontFace->ReleaseFontTable(tableContext); + + if (hasStrike) { + return true; + } + + // if we didn't find a real strike, check if the font calls for scaling + // another bitmap to this size + hr = mFontFace->TryGetFontTable(DWRITE_MAKE_OPENTYPE_TAG('E', 'B', 'S', 'C'), + (const void**)&tableData, &len, &tableContext, + &exists); + if (FAILED(hr)) { + return false; + } + + while (exists) { + if (len < sizeof(EBSCHeader)) { + break; + } + const EBSCHeader* hdr = reinterpret_cast<const EBSCHeader*>(tableData); + if (hdr->version != 0x00020000) { + break; + } + uint32_t numSizes = hdr->numSizes; + if (numSizes > 0xffff) { + break; + } + if (len < sizeof(EBSCHeader) + numSizes * sizeof(BitmapScaleTable)) { + break; + } + const BitmapScaleTable* scaleTable = + reinterpret_cast<const BitmapScaleTable*>(hdr + 1); + for (uint32_t i = 0; i < numSizes; ++i, ++scaleTable) { + if (scaleTable->ppemX == aSize && scaleTable->ppemY == aSize) { + hasStrike = true; + break; + } + } + break; + } + mFontFace->ReleaseFontTable(tableContext); + + return hasStrike; +} + +bool gfxDWriteFont::IsValid() const { return mFontFace != nullptr; } + +IDWriteFontFace* gfxDWriteFont::GetFontFace() { return mFontFace.get(); } + +gfxFont::RunMetrics gfxDWriteFont::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 && + GetMeasuringMode() == DWRITE_MEASURING_MODE_GDI_CLASSIC && + metrics.mBoundingBox.Width() > 0) { + metrics.mBoundingBox.MoveByX(-aTextRun->GetAppUnitsPerDevUnit()); + metrics.mBoundingBox.SetWidth(metrics.mBoundingBox.Width() + + aTextRun->GetAppUnitsPerDevUnit() * 3); + } + + return metrics; +} + +bool gfxDWriteFont::ProvidesGlyphWidths() const { + return !mUseSubpixelPositions || + (mFontFace->GetSimulations() & DWRITE_FONT_SIMULATIONS_BOLD) || + ((gfxDWriteFontEntry*)(GetFontEntry()))->HasVariations(); +} + +int32_t gfxDWriteFont::GetGlyphWidth(uint16_t aGID) { + if (!mGlyphWidths) { + mGlyphWidths = MakeUnique<nsTHashMap<nsUint32HashKey, int32_t>>(128); + } + + return mGlyphWidths->LookupOrInsertWith( + aGID, [&] { return NS_lround(MeasureGlyphWidth(aGID) * 65536.0); }); +} + +bool gfxDWriteFont::GetForceGDIClassic() const { + return sForceGDIClassicEnabled && + static_cast<gfxDWriteFontEntry*>(mFontEntry.get()) + ->GetForceGDIClassic() && + GetAdjustedSize() <= gfxDWriteFontList::PlatformFontList() + ->GetForceGDIClassicMaxFontSize(); +} + +DWRITE_MEASURING_MODE +gfxDWriteFont::GetMeasuringMode() const { + return DWriteSettings::Get(GetForceGDIClassic()).MeasuringMode(); +} + +gfxFloat gfxDWriteFont::MeasureGlyphWidth(uint16_t aGlyph) { + MOZ_SEH_TRY { + HRESULT hr; + if (mFontFace1) { + int32_t advance; + if (mUseSubpixelPositions) { + hr = mFontFace1->GetDesignGlyphAdvances(1, &aGlyph, &advance, FALSE); + if (SUCCEEDED(hr)) { + return advance * mFUnitsConvFactor; + } + } else { + hr = mFontFace1->GetGdiCompatibleGlyphAdvances( + FLOAT(mAdjustedSize), 1.0f, nullptr, + GetMeasuringMode() == DWRITE_MEASURING_MODE_GDI_NATURAL, FALSE, 1, + &aGlyph, &advance); + if (SUCCEEDED(hr)) { + return NS_lround(advance * mFUnitsConvFactor); + } + } + } else { + DWRITE_GLYPH_METRICS metrics; + if (mUseSubpixelPositions) { + hr = mFontFace->GetDesignGlyphMetrics(&aGlyph, 1, &metrics, FALSE); + if (SUCCEEDED(hr)) { + return metrics.advanceWidth * mFUnitsConvFactor; + } + } else { + hr = mFontFace->GetGdiCompatibleGlyphMetrics( + FLOAT(mAdjustedSize), 1.0f, nullptr, + GetMeasuringMode() == DWRITE_MEASURING_MODE_GDI_NATURAL, &aGlyph, 1, + &metrics, FALSE); + if (SUCCEEDED(hr)) { + return NS_lround(metrics.advanceWidth * mFUnitsConvFactor); + } + } + } + } + MOZ_SEH_EXCEPT(EXCEPTION_EXECUTE_HANDLER) { + // Exception (e.g. disk i/o error) occurred when DirectWrite tried to use + // the font resource; possibly a failing drive or similar hardware issue. + // Mark the font as invalid, and wipe the fontEntry's charmap so that font + // selection will skip it; we'll use a fallback font instead. + mIsValid = false; + GetFontEntry()->mCharacterMap = new gfxCharacterMap(); + GetFontEntry()->mShmemCharacterMap = nullptr; + gfxCriticalError() << "Exception occurred measuring glyph width for " + << GetFontEntry()->Name().get(); + } + return 0.0; +} + +bool gfxDWriteFont::GetGlyphBounds(uint16_t aGID, gfxRect* aBounds, + bool aTight) { + MOZ_SEH_TRY { + DWRITE_GLYPH_METRICS m; + HRESULT hr = mFontFace->GetDesignGlyphMetrics(&aGID, 1, &m, FALSE); + if (FAILED(hr)) { + return false; + } + gfxRect bounds(m.leftSideBearing, m.topSideBearing - m.verticalOriginY, + m.advanceWidth - m.leftSideBearing - m.rightSideBearing, + m.advanceHeight - m.topSideBearing - m.bottomSideBearing); + bounds.Scale(mFUnitsConvFactor); + // GetDesignGlyphMetrics returns 'ideal' glyph metrics, we need to pad to + // account for antialiasing. + if (!aTight && !aBounds->IsEmpty()) { + bounds.Inflate(1.0, 0.0); + } + *aBounds = bounds; + return true; + } + MOZ_SEH_EXCEPT(EXCEPTION_EXECUTE_HANDLER) { + // Exception (e.g. disk i/o error) occurred when DirectWrite tried to use + // the font resource; possibly a failing drive or similar hardware issue. + // Mark the font as invalid, and wipe the fontEntry's charmap so that font + // selection will skip it; we'll use a fallback font instead. + mIsValid = false; + GetFontEntry()->mCharacterMap = new gfxCharacterMap(); + GetFontEntry()->mShmemCharacterMap = nullptr; + gfxCriticalError() << "Exception occurred measuring glyph bounds for " + << GetFontEntry()->Name().get(); + } + return false; +} + +void gfxDWriteFont::AddSizeOfExcludingThis(MallocSizeOf aMallocSizeOf, + FontCacheSizes* aSizes) const { + gfxFont::AddSizeOfExcludingThis(aMallocSizeOf, aSizes); + if (mGlyphWidths) { + aSizes->mFontInstances += + mGlyphWidths->ShallowSizeOfIncludingThis(aMallocSizeOf); + } +} + +void gfxDWriteFont::AddSizeOfIncludingThis(MallocSizeOf aMallocSizeOf, + FontCacheSizes* aSizes) const { + aSizes->mFontInstances += aMallocSizeOf(this); + AddSizeOfExcludingThis(aMallocSizeOf, aSizes); +} + +already_AddRefed<ScaledFont> gfxDWriteFont::GetScaledFont( + const TextRunDrawParams& aRunParams) { + bool useClearType = UsingClearType(); + if (mAzureScaledFontUsedClearType != useClearType) { + if (auto* oldScaledFont = mAzureScaledFont.exchange(nullptr)) { + oldScaledFont->Release(); + } + if (auto* oldScaledFont = mAzureScaledFontGDI.exchange(nullptr)) { + oldScaledFont->Release(); + } + } + bool forceGDI = aRunParams.allowGDI && GetForceGDIClassic(); + ScaledFont* scaledFont = forceGDI ? mAzureScaledFontGDI : mAzureScaledFont; + if (scaledFont) { + return do_AddRef(scaledFont); + } + + gfxDWriteFontEntry* fe = static_cast<gfxDWriteFontEntry*>(mFontEntry.get()); + bool useEmbeddedBitmap = + (gfxVars::SystemTextRenderingMode() == DWRITE_RENDERING_MODE_DEFAULT || + forceGDI) && + fe->IsCJKFont() && HasBitmapStrikeForSize(NS_lround(mAdjustedSize)); + + const gfxFontStyle* fontStyle = GetStyle(); + RefPtr<ScaledFont> newScaledFont = Factory::CreateScaledFontForDWriteFont( + mFontFace, fontStyle, GetUnscaledFont(), GetAdjustedSize(), + useEmbeddedBitmap, ApplySyntheticBold(), forceGDI); + if (!newScaledFont) { + return nullptr; + } + InitializeScaledFont(newScaledFont); + + if (forceGDI) { + if (mAzureScaledFontGDI.compareExchange(nullptr, newScaledFont.get())) { + Unused << newScaledFont.forget(); + mAzureScaledFontUsedClearType = useClearType; + } + scaledFont = mAzureScaledFontGDI; + } else { + if (mAzureScaledFont.compareExchange(nullptr, newScaledFont.get())) { + Unused << newScaledFont.forget(); + mAzureScaledFontUsedClearType = useClearType; + } + scaledFont = mAzureScaledFont; + } + return do_AddRef(scaledFont); +} + +bool gfxDWriteFont::ShouldRoundXOffset(cairo_t* aCairo) const { + // show_glyphs is implemented on the font and so is used for all Cairo + // surface types; however, it may pixel-snap depending on the dwrite + // rendering mode + return GetMeasuringMode() != DWRITE_MEASURING_MODE_NATURAL; +} |