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/* -*- 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 "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;
}
UniquePtr<gfxFont> gfxGDIFont::CopyWithAntialiasOption(
AntialiasOption anAAOption) {
auto entry = static_cast<GDIFontEntry*>(mFontEntry.get());
return MakeUnique<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);
}
const gfxFont::Metrics& gfxGDIFont::GetHorizontalMetrics() { return *mMetrics; }
already_AddRefed<ScaledFont> gfxGDIFont::GetScaledFont(DrawTarget* aTarget) {
if (!mAzureScaledFont) {
LOGFONT lf;
GetObject(GetHFONT(), sizeof(LOGFONT), &lf);
mAzureScaledFont = Factory::CreateScaledFontForGDIFont(
&lf, GetUnscaledFont(), GetAdjustedSize());
InitializeScaledFont();
}
RefPtr<ScaledFont> scaledFont(mAzureScaledFont);
return scaledFont.forget();
}
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(0x6C34, 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.
mHarfBuzzShaper = 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!
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.
// 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
}
SanitizeMetrics(mMetrics, GetFontEntry()->mIsBadUnderlineFont);
} else {
mFUnitsConvFactor = 0.0; // zero-sized font: all values scale to zero
}
if (IsSyntheticBold()) {
mMetrics->aveCharWidth += GetSyntheticBoldOffset();
mMetrics->maxAdvance += GetSyntheticBoldOffset();
}
#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;
DWORD 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).
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);
}