Experimental coretext backend for SkShaper
Primary goal: API compatibility with SkShaper but reduce code size on iOS. Change-Id: I6ee8f49827a029569010a69308541b74a21ac3e2 Reviewed-on: https://skia-review.googlesource.com/c/skia/+/266854 Reviewed-by: Mike Reed <reed@google.com> Commit-Queue: Mike Reed <reed@google.com>
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Mike Reed
Skia Commit-Bot
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commit
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@ -34,6 +34,8 @@ public:
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static std::unique_ptr<SkShaper> MakeShapeThenWrap(sk_sp<SkFontMgr> = nullptr);
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static std::unique_ptr<SkShaper> MakeShapeDontWrapOrReorder(sk_sp<SkFontMgr> = nullptr);
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#endif
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// Returns nullptr if not supported
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static std::unique_ptr<SkShaper> MakeCoreText();
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static std::unique_ptr<SkShaper> Make(sk_sp<SkFontMgr> = nullptr);
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@ -12,5 +12,6 @@ skia_shaper_public = [ "$_include/SkShaper.h" ]
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skia_shaper_primitive_sources = [
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"$_src/SkShaper.cpp",
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"$_src/SkShaper_primitive.cpp",
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"$_src/SkShaper_coretext.cpp",
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]
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skia_shaper_harfbuzz_sources = [ "$_src/SkShaper_harfbuzz.cpp" ]
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235
modules/skshaper/src/SkShaper_coretext.cpp
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235
modules/skshaper/src/SkShaper_coretext.cpp
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@ -0,0 +1,235 @@
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/*
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* Copyright 2020 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "modules/skshaper/include/SkShaper.h"
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#if defined(SK_BUILD_FOR_MAC) || defined(SK_BUILD_FOR_IOS)
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#ifdef SK_BUILD_FOR_MAC
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#import <ApplicationServices/ApplicationServices.h>
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#endif
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#ifdef SK_BUILD_FOR_IOS
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#include <CoreText/CoreText.h>
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#include <CoreText/CTFontManager.h>
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#include <CoreGraphics/CoreGraphics.h>
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#include <CoreFoundation/CoreFoundation.h>
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#endif
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#include "include/core/SkFontMetrics.h"
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#include "include/core/SkStream.h"
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#include "include/core/SkTypeface.h"
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#include "include/private/SkTo.h"
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#include "src/utils/SkUTF.h"
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class SkShaper_CoreText : public SkShaper {
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public:
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SkShaper_CoreText() {}
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private:
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void shape(const char* utf8, size_t utf8Bytes,
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const SkFont& srcFont,
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bool leftToRight,
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SkScalar width,
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RunHandler*) const override;
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void shape(const char* utf8, size_t utf8Bytes,
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FontRunIterator&,
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BiDiRunIterator&,
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ScriptRunIterator&,
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LanguageRunIterator&,
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SkScalar width,
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RunHandler*) const override;
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void shape(const char* utf8, size_t utf8Bytes,
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FontRunIterator&,
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BiDiRunIterator&,
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ScriptRunIterator&,
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LanguageRunIterator&,
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const Feature*, size_t featureSize,
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SkScalar width,
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RunHandler*) const override;
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};
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std::unique_ptr<SkShaper> SkShaper::MakeCoreText() {
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return std::make_unique<SkShaper_CoreText>();
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}
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void SkShaper_CoreText::shape(const char* utf8, size_t utf8Bytes,
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FontRunIterator& font,
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BiDiRunIterator& bidi,
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ScriptRunIterator&,
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LanguageRunIterator&,
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SkScalar width,
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RunHandler* handler) const
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{
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SkFont skfont;
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if (!font.atEnd()) {
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font.consume();
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skfont = font.currentFont();
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} else {
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skfont.setTypeface(sk_ref_sp(skfont.getTypefaceOrDefault()));
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}
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SkASSERT(skfont.getTypeface());
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bool skbidi = 0;
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if (!bidi.atEnd()) {
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bidi.consume();
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skbidi = (bidi.currentLevel() % 2) == 0;
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}
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return this->shape(utf8, utf8Bytes, skfont, skbidi, width, handler);
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}
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void SkShaper_CoreText::shape(const char* utf8, size_t utf8Bytes,
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FontRunIterator& font,
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BiDiRunIterator& bidi,
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ScriptRunIterator&,
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LanguageRunIterator&,
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const Feature*, size_t,
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SkScalar width,
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RunHandler* handler) const {
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font.consume();
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SkASSERT(font.currentFont().getTypeface());
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bidi.consume();
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return this->shape(utf8, utf8Bytes, font.currentFont(), (bidi.currentLevel() % 2) == 0,
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width, handler);
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}
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#include "include/ports/SkTypeface_mac.h"
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#include <vector>
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// CTFramesetter/CTFrame can do this, but require version 10.14
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class LineBreakIter {
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CTTypesetterRef fTypesetter;
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double fWidth;
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CFIndex fStart;
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public:
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LineBreakIter(CTTypesetterRef ts, SkScalar width) : fTypesetter(ts), fWidth(width) {
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fStart = 0;
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}
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CTLineRef nextLine() {
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CFIndex count = CTTypesetterSuggestLineBreak(fTypesetter, fStart, fWidth);
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if (count == 0) {
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return nullptr;
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}
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auto line = CTTypesetterCreateLine(fTypesetter, {fStart, count});
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fStart += count;
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return line;
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}
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};
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void SkShaper_CoreText::shape(const char* utf8, size_t utf8Bytes,
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const SkFont& font,
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bool /* leftToRight */,
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SkScalar width,
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RunHandler* handler) const {
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auto cgfloat_to_scalar = [](CGFloat x) {
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SkScalar s;
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if (sizeof(CGFloat) == sizeof(double)) {
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s = SkDoubleToScalar(x);
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} else {
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s = x;
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}
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return s;
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};
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CFStringRef textString = CFStringCreateWithBytes(nullptr, (const uint8_t*)utf8, utf8Bytes,
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kCFStringEncodingUTF8, false);
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auto typeface = font.getTypefaceOrDefault();
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auto ctfont = SkTypeface_GetCTFontRef(typeface);
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auto ctfont2 = CTFontCreateCopyWithAttributes(ctfont, font.getSize(), nullptr, nullptr);
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CFMutableDictionaryRef attr =
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CFDictionaryCreateMutable(kCFAllocatorDefault, 0,
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&kCFTypeDictionaryKeyCallBacks,
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&kCFTypeDictionaryValueCallBacks);
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CFDictionaryAddValue(attr, kCTFontAttributeName, ctfont2);
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CFAttributedStringRef attrString = CFAttributedStringCreate(nullptr, textString, attr);
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CTTypesetterRef typesetter = CTTypesetterCreateWithAttributedStringAndOptions(attrString,
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nullptr);
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// We have to compute RunInfos in a loop, and then reuse them in a 2nd loop,
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// so we store them in an array (we reuse the array's storage for each line).
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std::vector<SkShaper::RunHandler::RunInfo> infos;
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LineBreakIter iter(typesetter, width);
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while (CTLineRef line = iter.nextLine()) {
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CFArrayRef run_array = CTLineGetGlyphRuns(line);
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CFIndex runCount = CFArrayGetCount(run_array);
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if (runCount == 0) {
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continue;
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}
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handler->beginLine();
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infos.clear();
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for (CFIndex j = 0; j < runCount; ++j) {
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CTRunRef run = (CTRunRef)CFArrayGetValueAtIndex(run_array, j);
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CFIndex runGlyphs = CTRunGetGlyphCount(run);
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SkASSERT(sizeof(CGGlyph) == sizeof(uint16_t));
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CGSize advances[10000];
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CTRunGetAdvances(run, {0, runGlyphs}, advances);
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SkScalar adv = 0;
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for (CFIndex k = 0; k < runGlyphs; ++k) {
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adv += advances[k].width;
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}
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CFRange range = CTRunGetStringRange(run);
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infos.push_back({
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font, // need resolved font
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0, // need fBidiLevel
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{adv, 0}, // fAdvance;
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(size_t)runGlyphs,
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{(size_t)range.location, (size_t)range.length},
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});
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handler->runInfo(infos.back());
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}
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handler->commitRunInfo();
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// Now loop through again and fill in the buffers
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for (CFIndex j = 0; j < runCount; ++j) {
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const auto& info = infos[j];
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auto buffer = handler->runBuffer(info);
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CTRunRef run = (CTRunRef)CFArrayGetValueAtIndex(run_array, j);
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CFIndex runGlyphs = info.glyphCount;
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SkASSERT(CTRunGetGlyphCount(run) == (CFIndex)info.glyphCount);
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CTRunGetGlyphs(run, {0, runGlyphs}, buffer.glyphs);
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CGPoint positions[10000];
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CTRunGetPositions(run, {0, runGlyphs}, positions);
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CFIndex indices[10000];
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if (buffer.clusters) {
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CTRunGetStringIndices(run, {0, runGlyphs}, indices);
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}
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for (CFIndex k = 0; k < runGlyphs; ++k) {
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buffer.positions[k] = {
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buffer.point.fX + cgfloat_to_scalar(positions[k].x),
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buffer.point.fY,
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};
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if (buffer.offsets) {
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buffer.offsets[k] = {0, 0}; // ???
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}
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if (buffer.clusters) {
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buffer.clusters[k] = indices[k];
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}
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}
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handler->commitRunBuffer(info);
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}
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handler->commitLine();
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}
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}
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#else
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std::unique_ptr<SkShaper> SkShaper::MakeCoreText() {
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return nullptr;
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}
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#endif
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@ -24,6 +24,8 @@
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#include "src/shaders/SkColorShader.h"
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#include "src/utils/SkUTF.h"
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typedef std::unique_ptr<SkShaper> (*ShaperFactory)();
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static const char gText[] =
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"When in the Course of human events it becomes necessary for one people "
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"to dissolve the political bands which have connected them with another "
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@ -33,11 +35,14 @@ static const char gText[] =
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"declare the causes which impel them to the separation.";
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class TextBoxView : public Sample {
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SkString fName;
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public:
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TextBoxView() : fShaper(SkShaper::Make()) {}
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TextBoxView(ShaperFactory fact, const char suffix[]) : fShaper(fact()) {
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fName.printf("TextBox_%s", suffix);
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}
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protected:
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SkString name() override { return SkString("TextBox"); }
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SkString name() override { return fName; }
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void drawTest(SkCanvas* canvas, SkScalar w, SkScalar h, SkColor fg, SkColor bg) {
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SkAutoCanvasRestore acr(canvas, true);
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@ -107,6 +112,7 @@ private:
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typedef Sample INHERITED;
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};
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//////////////////////////////////////////////////////////////////////////////
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DEF_SAMPLE( return new TextBoxView(); )
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DEF_SAMPLE( return new TextBoxView([](){ return SkShaper::Make(); }, "default"); );
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#ifdef SK_BUILD_FOR_MAC
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DEF_SAMPLE( return new TextBoxView(SkShaper::MakeCoreText, "coretext"); );
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#endif
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