зеркало из https://github.com/mozilla/gecko-dev.git
275 строки
8.6 KiB
C++
275 строки
8.6 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 "ScaledFontMac.h"
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#ifdef USE_SKIA
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#include "PathSkia.h"
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#include "skia/SkPaint.h"
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#include "skia/SkPath.h"
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#include "skia/SkTypeface_mac.h"
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#endif
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#include "DrawTargetCG.h"
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#include <vector>
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#include <dlfcn.h>
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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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namespace mozilla {
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namespace gfx {
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ScaledFontMac::CTFontDrawGlyphsFuncT* ScaledFontMac::CTFontDrawGlyphsPtr = nullptr;
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bool ScaledFontMac::sSymbolLookupDone = false;
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ScaledFontMac::ScaledFontMac(CGFontRef aFont, Float aSize)
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: ScaledFontBase(aSize)
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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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// XXX: should we be taking a reference
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mFont = CGFontRetain(aFont);
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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 = CTFontCreateWithGraphicsFont(aFont, aSize, nullptr, nullptr);
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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 = CTFontCreateWithGraphicsFont(mFont, mSize, nullptr, nullptr);
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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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TemporaryRef<Path>
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ScaledFontMac::GetPathForGlyphs(const GlyphBuffer &aBuffer, const DrawTarget *aTarget)
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{
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if (aTarget->GetType() == BackendType::COREGRAPHICS || aTarget->GetType() == BackendType::COREGRAPHICS_ACCELERATED) {
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CGMutablePathRef path = CGPathCreateMutable();
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for (unsigned int i = 0; i < aBuffer.mNumGlyphs; i++) {
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// XXX: we could probably fold both of these transforms together to avoid extra work
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CGAffineTransform flip = CGAffineTransformMakeScale(1, -1);
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CGPathRef glyphPath = ::CGFontGetGlyphPath(mFont, &flip, 0, aBuffer.mGlyphs[i].mIndex);
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CGAffineTransform matrix = CGAffineTransformMake(mSize, 0, 0, mSize,
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aBuffer.mGlyphs[i].mPosition.x,
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aBuffer.mGlyphs[i].mPosition.y);
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CGPathAddPath(path, &matrix, glyphPath);
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CGPathRelease(glyphPath);
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}
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TemporaryRef<Path> ret = new PathCG(path, FillRule::FILL_WINDING);
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CGPathRelease(path);
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return ret;
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} else {
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return ScaledFontBase::GetPathForGlyphs(aBuffer, aTarget);
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}
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}
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void
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ScaledFontMac::CopyGlyphsToBuilder(const GlyphBuffer &aBuffer, PathBuilder *aBuilder, BackendType aBackendType, const Matrix *aTransformHint)
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{
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if (!(aBackendType == BackendType::COREGRAPHICS || aBackendType == BackendType::COREGRAPHICS_ACCELERATED)) {
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ScaledFontBase::CopyGlyphsToBuilder(aBuffer, aBuilder, aBackendType, aTransformHint);
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return;
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}
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PathBuilderCG *pathBuilderCG =
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static_cast<PathBuilderCG*>(aBuilder);
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// XXX: check builder type
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for (unsigned int i = 0; i < aBuffer.mNumGlyphs; i++) {
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// XXX: we could probably fold both of these transforms together to avoid extra work
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CGAffineTransform flip = CGAffineTransformMakeScale(1, -1);
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CGPathRef glyphPath = ::CGFontGetGlyphPath(mFont, &flip, 0, aBuffer.mGlyphs[i].mIndex);
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CGAffineTransform matrix = CGAffineTransformMake(mSize, 0, 0, mSize,
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aBuffer.mGlyphs[i].mPosition.x,
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aBuffer.mGlyphs[i].mPosition.y);
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CGPathAddPath(pathBuilderCG->mCGPath, &matrix, glyphPath);
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CGPathRelease(glyphPath);
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}
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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+3) & ~3) / 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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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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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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ScaledFontMac::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, mSize, aBaton);
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return true;
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}
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}
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}
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