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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
commit36d22d82aa202bb199967e9512281e9a53db42c9 (patch)
tree105e8c98ddea1c1e4784a60a5a6410fa416be2de /gfx/thebes/gfxGDIFont.cpp
parentInitial commit. (diff)
downloadfirefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz
firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'gfx/thebes/gfxGDIFont.cpp')
-rw-r--r--gfx/thebes/gfxGDIFont.cpp553
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);
+}