зеркало из https://github.com/mozilla/gecko-dev.git
583 строки
17 KiB
C++
583 строки
17 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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 "ScaledFontMac.h"
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#include "UnscaledFontMac.h"
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#include "mozilla/webrender/WebRenderTypes.h"
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#ifdef USE_SKIA
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#include "PathSkia.h"
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#include "skia/include/core/SkPaint.h"
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#include "skia/include/core/SkPath.h"
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#include "skia/include/ports/SkTypeface_mac.h"
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#endif
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#include <vector>
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#include <dlfcn.h>
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#ifdef MOZ_WIDGET_UIKIT
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#include <CoreFoundation/CoreFoundation.h>
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#endif
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#include "nsCocoaFeatures.h"
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#include "mozilla/gfx/Logging.h"
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#ifdef MOZ_WIDGET_COCOA
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// prototype for private API
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extern "C" {
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CGPathRef CGFontGetGlyphPath(CGFontRef fontRef, CGAffineTransform *textTransform, int unknown, CGGlyph glyph);
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};
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#endif
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#ifdef USE_CAIRO_SCALED_FONT
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#include "cairo-quartz.h"
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#endif
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namespace mozilla {
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namespace gfx {
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// Simple helper class to automatically release a CFObject when it goes out
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// of scope.
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template<class T>
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class AutoRelease
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{
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public:
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explicit AutoRelease(T aObject)
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: mObject(aObject)
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{
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}
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~AutoRelease()
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{
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if (mObject) {
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CFRelease(mObject);
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}
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}
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operator T()
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{
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return mObject;
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}
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T forget()
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{
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T obj = mObject;
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mObject = nullptr;
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return obj;
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}
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private:
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T mObject;
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};
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ScaledFontMac::CTFontDrawGlyphsFuncT* ScaledFontMac::CTFontDrawGlyphsPtr = nullptr;
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bool ScaledFontMac::sSymbolLookupDone = false;
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// Helper to create a CTFont from a CGFont, copying any variations that were
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// set on the original CGFont.
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static CTFontRef
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CreateCTFontFromCGFontWithVariations(CGFontRef aCGFont, CGFloat aSize)
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{
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// Avoid calling potentially buggy variation APIs on pre-Sierra macOS
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// versions (see bug 1331683)
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if (!nsCocoaFeatures::OnSierraOrLater()) {
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return CTFontCreateWithGraphicsFont(aCGFont, aSize, nullptr, nullptr);
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}
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CFDictionaryRef vars = CGFontCopyVariations(aCGFont);
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CTFontRef ctFont;
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if (vars) {
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CFDictionaryRef varAttr =
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CFDictionaryCreate(nullptr,
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(const void**)&kCTFontVariationAttribute,
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(const void**)&vars, 1,
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&kCFTypeDictionaryKeyCallBacks,
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&kCFTypeDictionaryValueCallBacks);
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CFRelease(vars);
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CTFontDescriptorRef varDesc = CTFontDescriptorCreateWithAttributes(varAttr);
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CFRelease(varAttr);
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ctFont = CTFontCreateWithGraphicsFont(aCGFont, aSize, nullptr, varDesc);
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CFRelease(varDesc);
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} else {
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ctFont = CTFontCreateWithGraphicsFont(aCGFont, aSize, nullptr, nullptr);
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}
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return ctFont;
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}
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ScaledFontMac::ScaledFontMac(CGFontRef aFont,
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const RefPtr<UnscaledFont>& aUnscaledFont,
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Float aSize,
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bool aOwnsFont,
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const Color &aFontSmoothingBackgroundColor,
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bool aUseFontSmoothing,
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bool aApplySyntheticBold)
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: ScaledFontBase(aUnscaledFont, aSize)
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, mFont(aFont)
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, mFontSmoothingBackgroundColor(aFontSmoothingBackgroundColor)
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, mUseFontSmoothing(aUseFontSmoothing)
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, mApplySyntheticBold(aApplySyntheticBold)
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{
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if (!sSymbolLookupDone) {
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CTFontDrawGlyphsPtr =
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(CTFontDrawGlyphsFuncT*)dlsym(RTLD_DEFAULT, "CTFontDrawGlyphs");
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sSymbolLookupDone = true;
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}
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if (!aOwnsFont) {
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// XXX: should we be taking a reference
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CGFontRetain(aFont);
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}
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if (CTFontDrawGlyphsPtr != nullptr) {
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// only create mCTFont if we're going to be using the CTFontDrawGlyphs API
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mCTFont = CreateCTFontFromCGFontWithVariations(aFont, aSize);
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} else {
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mCTFont = nullptr;
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}
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}
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ScaledFontMac::~ScaledFontMac()
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{
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if (mCTFont) {
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CFRelease(mCTFont);
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}
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CGFontRelease(mFont);
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}
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#ifdef USE_SKIA
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SkTypeface* ScaledFontMac::GetSkTypeface()
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{
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if (!mTypeface) {
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if (mCTFont) {
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mTypeface = SkCreateTypefaceFromCTFont(mCTFont);
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} else {
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CTFontRef fontFace = CreateCTFontFromCGFontWithVariations(mFont, mSize);
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mTypeface = SkCreateTypefaceFromCTFont(fontFace);
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CFRelease(fontFace);
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}
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}
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return mTypeface;
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}
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#endif
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// private API here are the public options on OS X
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// CTFontCreatePathForGlyph
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// ATSUGlyphGetCubicPaths
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// we've used this in cairo sucessfully for some time.
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// Note: cairo dlsyms it. We could do that but maybe it's
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// safe just to use?
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already_AddRefed<Path>
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ScaledFontMac::GetPathForGlyphs(const GlyphBuffer &aBuffer, const DrawTarget *aTarget)
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{
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return ScaledFontBase::GetPathForGlyphs(aBuffer, aTarget);
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}
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uint32_t
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CalcTableChecksum(const uint32_t *tableStart, uint32_t length, bool skipChecksumAdjust = false)
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{
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uint32_t sum = 0L;
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const uint32_t *table = tableStart;
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const uint32_t *end = table + length / sizeof(uint32_t);
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while (table < end) {
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if (skipChecksumAdjust && (table - tableStart) == 2) {
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table++;
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} else {
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sum += CFSwapInt32BigToHost(*table++);
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}
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}
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// The length is not 4-byte aligned, but we still must process the remaining bytes.
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if (length & 3) {
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// Pad with zero before adding to the checksum.
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uint32_t last = 0;
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memcpy(&last, end, length & 3);
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sum += CFSwapInt32BigToHost(last);
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}
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return sum;
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}
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struct TableRecord {
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uint32_t tag;
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uint32_t checkSum;
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uint32_t offset;
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uint32_t length;
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CFDataRef data;
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};
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int maxPow2LessThan(int a)
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{
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int x = 1;
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int shift = 0;
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while ((x<<(shift+1)) < a) {
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shift++;
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}
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return shift;
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}
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struct writeBuf
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{
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explicit writeBuf(int size)
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{
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this->data = new unsigned char [size];
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this->offset = 0;
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}
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~writeBuf() {
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delete[] this->data;
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}
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template <class T>
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void writeElement(T a)
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{
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*reinterpret_cast<T*>(&this->data[this->offset]) = a;
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this->offset += sizeof(T);
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}
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void writeMem(const void *data, unsigned long length)
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{
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memcpy(&this->data[this->offset], data, length);
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this->offset += length;
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}
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void align()
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{
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while (this->offset & 3) {
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this->data[this->offset] = 0;
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this->offset++;
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}
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}
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unsigned char *data;
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int offset;
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};
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bool
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UnscaledFontMac::GetFontFileData(FontFileDataOutput aDataCallback, void *aBaton)
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{
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// We'll reconstruct a TTF font from the tables we can get from the CGFont
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CFArrayRef tags = CGFontCopyTableTags(mFont);
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CFIndex count = CFArrayGetCount(tags);
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TableRecord *records = new TableRecord[count];
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uint32_t offset = 0;
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offset += sizeof(uint32_t)*3;
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offset += sizeof(uint32_t)*4*count;
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bool CFF = false;
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for (CFIndex i = 0; i<count; i++) {
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uint32_t tag = (uint32_t)(uintptr_t)CFArrayGetValueAtIndex(tags, i);
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if (tag == 0x43464620) // 'CFF '
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CFF = true;
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CFDataRef data = CGFontCopyTableForTag(mFont, tag);
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records[i].tag = tag;
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records[i].offset = offset;
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records[i].data = data;
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records[i].length = CFDataGetLength(data);
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bool skipChecksumAdjust = (tag == 0x68656164); // 'head'
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records[i].checkSum = CalcTableChecksum(reinterpret_cast<const uint32_t*>(CFDataGetBytePtr(data)),
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records[i].length, skipChecksumAdjust);
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offset += records[i].length;
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// 32 bit align the tables
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offset = (offset + 3) & ~3;
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}
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CFRelease(tags);
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struct writeBuf buf(offset);
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// write header/offset table
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if (CFF) {
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buf.writeElement(CFSwapInt32HostToBig(0x4f54544f));
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} else {
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buf.writeElement(CFSwapInt32HostToBig(0x00010000));
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}
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buf.writeElement(CFSwapInt16HostToBig(count));
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buf.writeElement(CFSwapInt16HostToBig((1<<maxPow2LessThan(count))*16));
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buf.writeElement(CFSwapInt16HostToBig(maxPow2LessThan(count)));
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buf.writeElement(CFSwapInt16HostToBig(count*16-((1<<maxPow2LessThan(count))*16)));
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// write table record entries
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for (CFIndex i = 0; i<count; i++) {
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buf.writeElement(CFSwapInt32HostToBig(records[i].tag));
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buf.writeElement(CFSwapInt32HostToBig(records[i].checkSum));
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buf.writeElement(CFSwapInt32HostToBig(records[i].offset));
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buf.writeElement(CFSwapInt32HostToBig(records[i].length));
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}
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// write tables
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int checkSumAdjustmentOffset = 0;
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for (CFIndex i = 0; i<count; i++) {
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if (records[i].tag == 0x68656164) {
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checkSumAdjustmentOffset = buf.offset + 2*4;
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}
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buf.writeMem(CFDataGetBytePtr(records[i].data), CFDataGetLength(records[i].data));
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buf.align();
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CFRelease(records[i].data);
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}
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delete[] records;
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// clear the checksumAdjust field before checksumming the whole font
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memset(&buf.data[checkSumAdjustmentOffset], 0, sizeof(uint32_t));
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uint32_t fontChecksum = CFSwapInt32HostToBig(0xb1b0afba - CalcTableChecksum(reinterpret_cast<const uint32_t*>(buf.data), offset));
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// set checkSumAdjust to the computed checksum
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memcpy(&buf.data[checkSumAdjustmentOffset], &fontChecksum, sizeof(fontChecksum));
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// we always use an index of 0
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aDataCallback(buf.data, buf.offset, 0, aBaton);
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return true;
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}
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bool
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UnscaledFontMac::GetWRFontDescriptor(WRFontDescriptorOutput aCb, void* aBaton)
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{
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if (mIsDataFont) {
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return false;
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}
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CFStringRef psname = CGFontCopyPostScriptName(mFont);
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if (!psname) {
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return false;
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}
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char buf[256];
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const char* cstr = CFStringGetCStringPtr(psname, kCFStringEncodingUTF8);
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if (!cstr) {
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if (!CFStringGetCString(psname, buf, sizeof(buf), kCFStringEncodingUTF8)) {
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return false;
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}
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cstr = buf;
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}
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aCb(reinterpret_cast<const uint8_t*>(cstr), strlen(cstr), 0, aBaton);
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return true;
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}
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static void
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CollectVariationsFromDictionary(const void* aKey, const void* aValue, void* aContext)
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{
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auto keyPtr = static_cast<const CFTypeRef>(aKey);
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auto valuePtr = static_cast<const CFTypeRef>(aValue);
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auto outVariations = static_cast<std::vector<FontVariation>*>(aContext);
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if (CFGetTypeID(keyPtr) == CFNumberGetTypeID() &&
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CFGetTypeID(valuePtr) == CFNumberGetTypeID()) {
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uint64_t t;
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double v;
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if (CFNumberGetValue(static_cast<CFNumberRef>(keyPtr), kCFNumberSInt64Type, &t) &&
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CFNumberGetValue(static_cast<CFNumberRef>(valuePtr), kCFNumberDoubleType, &v)) {
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outVariations->push_back(FontVariation{uint32_t(t), float(v)});
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}
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}
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}
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static bool
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GetVariationsForCTFont(CTFontRef aCTFont, std::vector<FontVariation>* aOutVariations)
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{
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// Avoid calling potentially buggy variation APIs on pre-Sierra macOS
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// versions (see bug 1331683)
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if (!nsCocoaFeatures::OnSierraOrLater()) {
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return true;
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}
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if (!aCTFont) {
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return true;
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}
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AutoRelease<CFDictionaryRef> dict(CTFontCopyVariation(aCTFont));
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CFIndex count = dict ? CFDictionaryGetCount(dict) : 0;
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if (count > 0) {
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aOutVariations->reserve(count);
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CFDictionaryApplyFunction(dict, CollectVariationsFromDictionary, aOutVariations);
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}
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return true;
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}
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bool
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ScaledFontMac::GetFontInstanceData(FontInstanceDataOutput aCb, void* aBaton)
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{
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// Collect any variation settings that were incorporated into the CTFont.
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std::vector<FontVariation> variations;
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if (!GetVariationsForCTFont(mCTFont, &variations)) {
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return false;
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}
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aCb(nullptr, 0, variations.data(), variations.size(), aBaton);
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return true;
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}
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bool
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ScaledFontMac::GetWRFontInstanceOptions(Maybe<wr::FontInstanceOptions>* aOutOptions,
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Maybe<wr::FontInstancePlatformOptions>* aOutPlatformOptions,
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std::vector<FontVariation>* aOutVariations)
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{
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GetVariationsForCTFont(mCTFont, aOutVariations);
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wr::FontInstanceOptions options;
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options.render_mode = wr::FontRenderMode::Subpixel;
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options.subpx_dir = wr::SubpixelDirection::Horizontal;
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options.flags = 0;
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if (mUseFontSmoothing) {
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options.flags |= wr::FontInstanceFlags::FONT_SMOOTHING;
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}
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if (mApplySyntheticBold) {
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options.flags |= wr::FontInstanceFlags::SYNTHETIC_BOLD;
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}
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options.bg_color = wr::ToColorU(mFontSmoothingBackgroundColor);
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*aOutOptions = Some(options);
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return true;
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}
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static CFDictionaryRef
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CreateVariationDictionaryOrNull(CGFontRef aCGFont, uint32_t aVariationCount,
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const FontVariation* aVariations)
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{
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// Avoid calling potentially buggy variation APIs on pre-Sierra macOS
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// versions (see bug 1331683)
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if (!nsCocoaFeatures::OnSierraOrLater()) {
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return nullptr;
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}
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AutoRelease<CTFontRef>
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ctFont(CTFontCreateWithGraphicsFont(aCGFont, 0, nullptr, nullptr));
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AutoRelease<CFArrayRef> axes(CTFontCopyVariationAxes(ctFont));
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if (!axes) {
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return nullptr;
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}
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CFIndex axisCount = CFArrayGetCount(axes);
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AutoRelease<CFMutableDictionaryRef>
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dict(CFDictionaryCreateMutable(kCFAllocatorDefault, axisCount,
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&kCFTypeDictionaryKeyCallBacks,
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&kCFTypeDictionaryValueCallBacks));
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// Number of variation settings passed in the aVariations parameter.
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// This will typically be a very low value, so we just linear-search them.
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bool allDefaultValues = true;
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for (CFIndex i = 0; i < axisCount; ++i) {
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// We sanity-check the axis info found in the CTFont, and bail out
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// (returning null) if it doesn't have the expected types.
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CFTypeRef axisInfo = CFArrayGetValueAtIndex(axes, i);
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if (CFDictionaryGetTypeID() != CFGetTypeID(axisInfo)) {
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return nullptr;
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}
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CFDictionaryRef axis = static_cast<CFDictionaryRef>(axisInfo);
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CFTypeRef axisTag =
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CFDictionaryGetValue(axis, kCTFontVariationAxisIdentifierKey);
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if (!axisTag || CFGetTypeID(axisTag) != CFNumberGetTypeID()) {
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return nullptr;
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}
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int64_t tagLong;
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if (!CFNumberGetValue(static_cast<CFNumberRef>(axisTag),
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kCFNumberSInt64Type, &tagLong)) {
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return nullptr;
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}
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CFTypeRef axisName =
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CFDictionaryGetValue(axis, kCTFontVariationAxisNameKey);
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if (!axisName || CFGetTypeID(axisName) != CFStringGetTypeID()) {
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return nullptr;
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}
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// Clamp axis values to the supported range.
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CFTypeRef min = CFDictionaryGetValue(axis, kCTFontVariationAxisMinimumValueKey);
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CFTypeRef max = CFDictionaryGetValue(axis, kCTFontVariationAxisMaximumValueKey);
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CFTypeRef def = CFDictionaryGetValue(axis, kCTFontVariationAxisDefaultValueKey);
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if (!min || CFGetTypeID(min) != CFNumberGetTypeID() ||
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!max || CFGetTypeID(max) != CFNumberGetTypeID() ||
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!def || CFGetTypeID(def) != CFNumberGetTypeID()) {
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return nullptr;
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}
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double minDouble;
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double maxDouble;
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double defDouble;
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if (!CFNumberGetValue(static_cast<CFNumberRef>(min), kCFNumberDoubleType,
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&minDouble) ||
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!CFNumberGetValue(static_cast<CFNumberRef>(max), kCFNumberDoubleType,
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&maxDouble) ||
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!CFNumberGetValue(static_cast<CFNumberRef>(def), kCFNumberDoubleType,
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&defDouble)) {
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return nullptr;
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}
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double value = defDouble;
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for (uint32_t j = 0; j < aVariationCount; ++j) {
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if (aVariations[j].mTag == tagLong) {
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|
value = std::min(std::max<double>(aVariations[j].mValue,
|
|
minDouble),
|
|
maxDouble);
|
|
if (value != defDouble) {
|
|
allDefaultValues = false;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
AutoRelease<CFNumberRef> valueNumber(CFNumberCreate(kCFAllocatorDefault,
|
|
kCFNumberDoubleType,
|
|
&value));
|
|
CFDictionaryAddValue(dict, axisName, valueNumber);
|
|
}
|
|
|
|
if (allDefaultValues) {
|
|
// We didn't actually set any non-default values, so throw away the
|
|
// variations dictionary and just use the default rendering.
|
|
return nullptr;
|
|
}
|
|
|
|
return dict.forget();
|
|
}
|
|
|
|
CGFontRef
|
|
UnscaledFontMac::CreateCGFontWithVariations(CGFontRef aFont,
|
|
uint32_t aVariationCount,
|
|
const FontVariation* aVariations)
|
|
{
|
|
MOZ_ASSERT(aVariationCount > 0);
|
|
MOZ_ASSERT(aVariations);
|
|
|
|
AutoRelease<CFDictionaryRef>
|
|
varDict(CreateVariationDictionaryOrNull(aFont, aVariationCount, aVariations));
|
|
if (!varDict) {
|
|
return nullptr;
|
|
}
|
|
|
|
return CGFontCreateCopyWithVariations(aFont, varDict);
|
|
}
|
|
|
|
already_AddRefed<ScaledFont>
|
|
UnscaledFontMac::CreateScaledFont(Float aGlyphSize,
|
|
const uint8_t* aInstanceData,
|
|
uint32_t aInstanceDataLength,
|
|
const FontVariation* aVariations,
|
|
uint32_t aNumVariations)
|
|
|
|
{
|
|
CGFontRef fontRef = mFont;
|
|
if (aNumVariations > 0) {
|
|
CGFontRef varFont =
|
|
CreateCGFontWithVariations(mFont, aNumVariations, aVariations);
|
|
if (varFont) {
|
|
fontRef = varFont;
|
|
}
|
|
}
|
|
|
|
RefPtr<ScaledFontMac> scaledFont =
|
|
new ScaledFontMac(fontRef, this, aGlyphSize, fontRef != mFont);
|
|
|
|
if (!scaledFont->PopulateCairoScaledFont()) {
|
|
gfxWarning() << "Unable to create cairo scaled Mac font.";
|
|
return nullptr;
|
|
}
|
|
|
|
return scaledFont.forget();
|
|
}
|
|
|
|
#ifdef USE_CAIRO_SCALED_FONT
|
|
cairo_font_face_t*
|
|
ScaledFontMac::GetCairoFontFace()
|
|
{
|
|
MOZ_ASSERT(mFont);
|
|
return cairo_quartz_font_face_create_for_cgfont(mFont);
|
|
}
|
|
#endif
|
|
|
|
} // namespace gfx
|
|
} // namespace mozilla
|