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gecko-dev/gfx/thebes/gfxGDIFont.cpp

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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* 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/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::unicode;
static inline cairo_antialias_t
GetCairoAntialiasOption(gfxFont::AntialiasOption anAntialiasOption)
{
switch (anAntialiasOption) {
default:
case gfxFont::kAntialiasDefault:
return CAIRO_ANTIALIAS_DEFAULT;
case gfxFont::kAntialiasNone:
return CAIRO_ANTIALIAS_NONE;
case gfxFont::kAntialiasGrayscale:
return CAIRO_ANTIALIAS_GRAY;
case gfxFont::kAntialiasSubpixel:
return CAIRO_ANTIALIAS_SUBPIXEL;
}
}
gfxGDIFont::gfxGDIFont(GDIFontEntry *aFontEntry,
const gfxFontStyle *aFontStyle,
bool aNeedsBold,
AntialiasOption anAAOption)
: gfxFont(aFontEntry, aFontStyle, anAAOption),
mFont(nullptr),
mFontFace(nullptr),
mMetrics(nullptr),
mSpaceGlyph(0),
mNeedsBold(aNeedsBold),
mScriptCache(nullptr)
{
}
gfxGDIFont::~gfxGDIFont()
{
if (mScaledFont) {
cairo_scaled_font_destroy(mScaledFont);
}
if (mFontFace) {
cairo_font_face_destroy(mFontFace);
}
if (mFont) {
::DeleteObject(mFont);
}
if (mScriptCache) {
ScriptFreeCache(&mScriptCache);
}
delete mMetrics;
}
gfxFont*
gfxGDIFont::CopyWithAntialiasOption(AntialiasOption anAAOption)
{
return new gfxGDIFont(static_cast<GDIFontEntry*>(mFontEntry.get()),
&mStyle, mNeedsBold, anAAOption);
}
bool
gfxGDIFont::ShapeText(DrawTarget *aDrawTarget,
const char16_t *aText,
uint32_t aOffset,
uint32_t aLength,
Script aScript,
bool aVertical,
gfxShapedText *aShapedText)
{
if (!mMetrics) {
Initialize();
}
if (!mIsValid) {
NS_WARNING("invalid font! expect incorrect text rendering");
return false;
}
// Ensure the cairo font is set up, so there's no risk it'll fall back to
// creating a "toy" font internally (see bug 544617).
// We must check that this succeeded, otherwise we risk cairo creating the
// wrong kind of font internally as a fallback (bug 744480).
if (!SetupCairoFont(aDrawTarget)) {
return false;
}
return gfxFont::ShapeText(aDrawTarget, aText, aOffset, aLength, aScript,
aVertical, aShapedText);
}
const gfxFont::Metrics&
gfxGDIFont::GetHorizontalMetrics()
{
if (!mMetrics) {
Initialize();
}
return *mMetrics;
}
uint32_t
gfxGDIFont::GetSpaceGlyph()
{
if (!mMetrics) {
Initialize();
}
return mSpaceGlyph;
}
bool
gfxGDIFont::SetupCairoFont(DrawTarget* aDrawTarget)
{
if (!mMetrics) {
Initialize();
}
if (!mScaledFont ||
cairo_scaled_font_status(mScaledFont) != CAIRO_STATUS_SUCCESS) {
// Don't cairo_set_scaled_font as that would propagate the error to
// the cairo_t, precluding any further drawing.
return false;
}
cairo_set_scaled_font(gfxFont::RefCairo(aDrawTarget), mScaledFont);
return true;
}
gfxFont::RunMetrics
gfxGDIFont::Measure(gfxTextRun *aTextRun,
uint32_t aStart, uint32_t aEnd,
BoundingBoxType aBoundingBoxType,
DrawTarget *aRefDrawTarget,
Spacing *aSpacing,
uint16_t 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.x -= aTextRun->GetAppUnitsPerDevUnit();
metrics.mBoundingBox.width += aTextRun->GetAppUnitsPerDevUnit() * 3;
}
return metrics;
}
void
gfxGDIFont::Initialize()
{
NS_ASSERTION(!mMetrics, "re-creating metrics? this will leak");
LOGFONTW logFont;
// Figure out if we want to do synthetic oblique styling.
GDIFontEntry* fe = static_cast<GDIFontEntry*>(GetFontEntry());
bool wantFakeItalic = mStyle.style != NS_FONT_STYLE_NORMAL &&
fe->IsUpright() && mStyle.allowSyntheticStyle;
// If the font's family has an actual italic face (but font matching
// didn't choose it), we have to use a cairo transform instead of asking
// GDI to italicize, because that would use a different face and result
// in a possible glyph ID mismatch between shaping and rendering.
//
// We use the mFamilyHasItalicFace flag in the entry in case of user fonts,
// where the *CSS* family may not know about italic faces that are present
// in the *GDI* family, and which GDI would use if we asked it to perform
// the "italicization".
bool useCairoFakeItalic = wantFakeItalic && fe->mFamilyHasItalicFace;
if (mAdjustedSize == 0.0) {
mAdjustedSize = mStyle.size;
if (mStyle.sizeAdjust > 0.0 && mAdjustedSize > 0.0) {
// to implement font-size-adjust, we first create the "unadjusted" font
FillLogFont(logFont, mAdjustedSize,
wantFakeItalic && !useCairoFakeItalic);
mFont = ::CreateFontIndirectW(&logFont);
// initialize its metrics so we can calculate size adjustment
Initialize();
// calculate the properly adjusted size, and then proceed
// to recreate mFont and recalculate metrics
gfxFloat aspect = mMetrics->xHeight / mMetrics->emHeight;
mAdjustedSize = mStyle.GetAdjustedSize(aspect);
// delete the temporary font and metrics
::DeleteObject(mFont);
mFont = nullptr;
delete mMetrics;
mMetrics = nullptr;
} else if (mStyle.sizeAdjust == 0.0) {
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 (mNeedsBold && GetFontEntry()->IsLocalUserFont()) {
mApplySyntheticBold = true;
}
// this may end up being zero
mAdjustedSize = ROUND(mAdjustedSize);
FillLogFont(logFont, mAdjustedSize, wantFakeItalic && !useCairoFakeItalic);
mFont = ::CreateFontIndirectW(&logFont);
mMetrics = new gfxFont::Metrics;
::memset(mMetrics, 0, sizeof(*mMetrics));
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;
}
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->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;
}
// 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;
}
}
}
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->zeroOrAveCharWidth = ROUND(size.cx);
} else {
mMetrics->zeroOrAveCharWidth = mMetrics->aveCharWidth;
}
SanitizeMetrics(mMetrics, GetFontEntry()->mIsBadUnderlineFont);
} else {
mFUnitsConvFactor = 0.0; // zero-sized font: all values scale to zero
}
if (IsSyntheticBold()) {
mMetrics->aveCharWidth += GetSyntheticBoldOffset();
mMetrics->maxAdvance += GetSyntheticBoldOffset();
}
mFontFace = cairo_win32_font_face_create_for_logfontw_hfont(&logFont,
mFont);
cairo_matrix_t sizeMatrix, ctm;
cairo_matrix_init_identity(&ctm);
cairo_matrix_init_scale(&sizeMatrix, mAdjustedSize, mAdjustedSize);
if (useCairoFakeItalic) {
// Skew the matrix to do fake italic if it wasn't already applied
// via the LOGFONT
double skewfactor = OBLIQUE_SKEW_FACTOR;
cairo_matrix_t style;
cairo_matrix_init(&style,
1, //xx
0, //yx
-1 * skewfactor, //xy
1, //yy
0, //x0
0); //y0
cairo_matrix_multiply(&sizeMatrix, &sizeMatrix, &style);
}
cairo_font_options_t *fontOptions = cairo_font_options_create();
if (mAntialiasOption != kAntialiasDefault) {
cairo_font_options_set_antialias(fontOptions,
GetCairoAntialiasOption(mAntialiasOption));
}
mScaledFont = cairo_scaled_font_create(mFontFace, &sizeMatrix,
&ctm, fontOptions);
cairo_font_options_destroy(fontOptions);
if (!mScaledFont ||
cairo_scaled_font_status(mScaledFont) != CAIRO_STATUS_SUCCESS) {
#ifdef DEBUG
char warnBuf[1024];
sprintf(warnBuf, "Failed to create scaled font: %s status: %d",
NS_ConvertUTF16toUTF8(mFontEntry->Name()).get(),
mScaledFont ? cairo_scaled_font_status(mScaledFont) : 0);
NS_WARNING(warnBuf);
#endif
mIsValid = false;
} else {
mIsValid = true;
}
#if 0
printf("Font: %p (%s) size: %f adjusted size: %f valid: %s\n", this,
NS_ConvertUTF16toUTF8(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 xHeight: %f\n", mMetrics->spaceWidth, mMetrics->aveCharWidth, mMetrics->xHeight);
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,
bool aUseGDIFakeItalic)
{
GDIFontEntry *fe = static_cast<GDIFontEntry*>(GetFontEntry());
uint16_t 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 = mNeedsBold ? 700 : 200;
}
} else {
weight = mNeedsBold ? 700 : fe->Weight();
}
fe->FillLogFont(&aLogFont, weight, aSize,
(mAntialiasOption == kAntialiasSubpixel) ? true : false);
// If GDI synthetic italic is wanted, force the lfItalic field to true
if (aUseGDIFakeItalic) {
aLogFont.lfItalic = 1;
}
}
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<nsDataHashtable<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->Put(aUnicode, glyph);
return glyph;
}
int32_t
gfxGDIFont::GetGlyphWidth(DrawTarget& aDrawTarget, uint16_t aGID)
{
if (!mGlyphWidths) {
mGlyphWidths = MakeUnique<nsDataHashtable<nsUint32HashKey,int32_t>>(128);
}
int32_t width;
if (mGlyphWidths->Get(aGID, &width)) {
return width;
}
DCFromDrawTarget dc(aDrawTarget);
AutoSelectFont fs(dc, GetHFONT());
int devWidth;
if (GetCharWidthI(dc, aGID, 1, nullptr, &devWidth)) {
// clamp value to range [0..0x7fff], and convert to 16.16 fixed-point
devWidth = std::min(std::max(0, devWidth), 0x7fff);
width = devWidth << 16;
mGlyphWidths->Put(aGID, width);
return width;
}
return -1;
}
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);
}
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