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