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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/. */
#if defined(MOZ_WIDGET_GTK)
# include "gfxPlatformGtk.h"
# define gfxToolkitPlatform gfxPlatformGtk
#elif defined(XP_WIN)
# include "gfxWindowsPlatform.h"
# define gfxToolkitPlatform gfxWindowsPlatform
#elif defined(ANDROID)
# include "gfxAndroidPlatform.h"
# define gfxToolkitPlatform gfxAndroidPlatform
#endif
#include "gfxTypes.h"
#include "gfxFT2Fonts.h"
#include "gfxFT2FontBase.h"
#include "gfxFT2Utils.h"
#include "gfxFT2FontList.h"
#include "gfxTextRun.h"
#include <locale.h>
#include "nsGkAtoms.h"
#include "nsTArray.h"
#include "nsCRT.h"
#include "nsXULAppAPI.h"
#include "mozilla/Logging.h"
#include "prinit.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/Preferences.h"
#include "mozilla/gfx/2D.h"
using namespace mozilla;
using namespace mozilla::gfx;
/**
* gfxFT2Font
*/
bool gfxFT2Font::ShapeText(DrawTarget* aDrawTarget, const char16_t* aText,
uint32_t aOffset, uint32_t aLength, Script aScript,
nsAtom* aLanguage, bool aVertical,
RoundingFlags aRounding,
gfxShapedText* aShapedText) {
if (!gfxFont::ShapeText(aDrawTarget, aText, aOffset, aLength, aScript,
aLanguage, aVertical, aRounding, aShapedText)) {
// harfbuzz must have failed(?!), just render raw glyphs
AddRange(aText, aOffset, aLength, aShapedText);
PostShapingFixup(aDrawTarget, aText, aOffset, aLength, aVertical,
aShapedText);
}
return true;
}
void gfxFT2Font::AddRange(const char16_t* aText, uint32_t aOffset,
uint32_t aLength, gfxShapedText* aShapedText) {
typedef gfxShapedText::CompressedGlyph CompressedGlyph;
const uint32_t appUnitsPerDevUnit = aShapedText->GetAppUnitsPerDevUnit();
// we'll pass this in/figure it out dynamically, but at this point there can
// be only one face.
gfxFT2LockedFace faceLock(this);
FT_Face face = faceLock.get();
CompressedGlyph* charGlyphs = aShapedText->GetCharacterGlyphs();
const gfxFT2Font::CachedGlyphData *cgd = nullptr, *cgdNext = nullptr;
FT_UInt spaceGlyph = GetSpaceGlyph();
for (uint32_t i = 0; i < aLength; i++, aOffset++) {
char16_t ch = aText[i];
if (ch == 0) {
// treat this null byte as a missing glyph, don't create a glyph for it
aShapedText->SetMissingGlyph(aOffset, 0, this);
continue;
}
NS_ASSERTION(!gfxFontGroup::IsInvalidChar(ch), "Invalid char detected");
if (cgdNext) {
cgd = cgdNext;
cgdNext = nullptr;
} else {
cgd = GetGlyphDataForChar(face, ch);
}
FT_UInt gid = cgd->glyphIndex;
int32_t advance = 0;
if (gid == 0) {
advance = -1; // trigger the missing glyphs case below
} else {
// find next character and its glyph -- in case they exist
// and exist in the current font face -- to compute kerning
char16_t chNext = 0;
FT_UInt gidNext = 0;
FT_Pos lsbDeltaNext = 0;
if (FT_HAS_KERNING(face) && i + 1 < aLength) {
chNext = aText[i + 1];
if (chNext != 0) {
cgdNext = GetGlyphDataForChar(face, chNext);
gidNext = cgdNext->glyphIndex;
if (gidNext && gidNext != spaceGlyph)
lsbDeltaNext = cgdNext->lsbDelta;
}
}
advance = cgd->xAdvance;
// now add kerning to the current glyph's advance
if (chNext && gidNext) {
FT_Vector kerning;
kerning.x = 0;
FT_Get_Kerning(face, gid, gidNext, FT_KERNING_DEFAULT, &kerning);
advance += kerning.x;
if (cgd->rsbDelta - lsbDeltaNext >= 32) {
advance -= 64;
} else if (cgd->rsbDelta - lsbDeltaNext < -32) {
advance += 64;
}
}
// convert 26.6 fixed point to app units
// round rather than truncate to nearest pixel
// because these advances are often scaled
advance = ((advance * appUnitsPerDevUnit + 32) >> 6);
}
if (advance >= 0 && CompressedGlyph::IsSimpleAdvance(advance) &&
CompressedGlyph::IsSimpleGlyphID(gid)) {
charGlyphs[aOffset].SetSimpleGlyph(advance, gid);
} else if (gid == 0) {
// gid = 0 only happens when the glyph is missing from the font
aShapedText->SetMissingGlyph(aOffset, ch, this);
} else {
gfxTextRun::DetailedGlyph details;
details.mGlyphID = gid;
NS_ASSERTION(details.mGlyphID == gid,
"Seriously weird glyph ID detected!");
details.mAdvance = advance;
aShapedText->SetDetailedGlyphs(aOffset, 1, &details);
}
}
}
gfxFT2Font::gfxFT2Font(const RefPtr<UnscaledFontFreeType>& aUnscaledFont,
RefPtr<mozilla::gfx::SharedFTFace>&& aFTFace,
FT2FontEntry* aFontEntry, const gfxFontStyle* aFontStyle,
int aLoadFlags)
: gfxFT2FontBase(aUnscaledFont, std::move(aFTFace), aFontEntry, aFontStyle,
aLoadFlags, aFontStyle->NeedsSyntheticBold(aFontEntry)),
mCharGlyphCache(32) {
NS_ASSERTION(mFontEntry,
"Unable to find font entry for font. Something is whack.");
InitMetrics();
}
gfxFT2Font::~gfxFT2Font() {}
already_AddRefed<ScaledFont> gfxFT2Font::GetScaledFont(
const TextRunDrawParams& aRunParams) {
if (ScaledFont* scaledFont = mAzureScaledFont) {
return do_AddRef(scaledFont);
}
RefPtr<ScaledFont> newScaledFont = Factory::CreateScaledFontForFreeTypeFont(
GetUnscaledFont(), GetAdjustedSize(), mFTFace,
GetStyle()->NeedsSyntheticBold(GetFontEntry()));
if (!newScaledFont) {
return nullptr;
}
InitializeScaledFont(newScaledFont);
if (mAzureScaledFont.compareExchange(nullptr, newScaledFont.get())) {
Unused << newScaledFont.forget();
}
ScaledFont* scaledFont = mAzureScaledFont;
return do_AddRef(scaledFont);
}
bool gfxFT2Font::ShouldHintMetrics() const {
return !gfxPlatform::GetPlatform()->RequiresLinearZoom();
}
void gfxFT2Font::FillGlyphDataForChar(FT_Face face, uint32_t ch,
CachedGlyphData* gd) {
if (!face->charmap || (face->charmap->encoding != FT_ENCODING_UNICODE &&
face->charmap->encoding != FT_ENCODING_MS_SYMBOL)) {
if (FT_Err_Ok != FT_Select_Charmap(face, FT_ENCODING_UNICODE) &&
FT_Err_Ok != FT_Select_Charmap(face, FT_ENCODING_MS_SYMBOL)) {
NS_WARNING("failed to select Unicode or symbol charmap!");
}
}
FT_UInt gid = FT_Get_Char_Index(face, ch);
if (gid == 0) {
// this font doesn't support this char!
NS_ASSERTION(gid != 0,
"We don't have a glyph, but font indicated that it supported "
"this char in tables?");
gd->glyphIndex = 0;
return;
}
FT_Error err = Factory::LoadFTGlyph(face, gid, mFTLoadFlags);
if (err) {
// hmm, this is weird, we failed to load a glyph that we had?
NS_WARNING("Failed to load glyph that we got from Get_Char_index");
gd->glyphIndex = 0;
return;
}
gd->glyphIndex = gid;
gd->lsbDelta = face->glyph->lsb_delta;
gd->rsbDelta = face->glyph->rsb_delta;
gd->xAdvance = face->glyph->advance.x;
if (gd->xAdvance) {
gd->xAdvance += GetEmboldenStrength(face).x;
}
}
void gfxFT2Font::AddSizeOfExcludingThis(MallocSizeOf aMallocSizeOf,
FontCacheSizes* aSizes) const {
gfxFont::AddSizeOfExcludingThis(aMallocSizeOf, aSizes);
aSizes->mFontInstances +=
mCharGlyphCache.ShallowSizeOfExcludingThis(aMallocSizeOf);
}
void gfxFT2Font::AddSizeOfIncludingThis(MallocSizeOf aMallocSizeOf,
FontCacheSizes* aSizes) const {
aSizes->mFontInstances += aMallocSizeOf(this);
AddSizeOfExcludingThis(aMallocSizeOf, aSizes);
}
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