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235 lines
7.7 KiB
235 lines
7.7 KiB
/*
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* Copyright 2015 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 "SkAdvancedTypefaceMetrics.h"
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#include "SkBitmap.h"
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#include "SkCanvas.h"
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#include "SkGlyph.h"
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#include "SkMakeUnique.h"
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#include "SkPath.h"
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#include "SkRandomScalerContext.h"
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#include "SkRectPriv.h"
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class SkDescriptor;
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class SkRandomScalerContext : public SkScalerContext {
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public:
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SkRandomScalerContext(sk_sp<SkRandomTypeface>, const SkScalerContextEffects&,
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const SkDescriptor*, bool fFakeIt);
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protected:
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unsigned generateGlyphCount() override;
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uint16_t generateCharToGlyph(SkUnichar) override;
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bool generateAdvance(SkGlyph*) override;
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void generateMetrics(SkGlyph*) override;
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void generateImage(const SkGlyph&) override;
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bool generatePath(SkGlyphID, SkPath*) override;
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void generateFontMetrics(SkFontMetrics*) override;
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private:
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SkRandomTypeface* getRandomTypeface() const {
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return static_cast<SkRandomTypeface*>(this->getTypeface());
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}
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std::unique_ptr<SkScalerContext> fProxy;
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bool fFakeIt;
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};
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SkRandomScalerContext::SkRandomScalerContext(sk_sp<SkRandomTypeface> face,
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const SkScalerContextEffects& effects,
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const SkDescriptor* desc,
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bool fakeIt)
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: SkScalerContext(std::move(face), effects, desc)
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, fProxy(getRandomTypeface()->proxy()->createScalerContext(SkScalerContextEffects(), desc))
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, fFakeIt(fakeIt)
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{
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fProxy->forceGenerateImageFromPath();
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}
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unsigned SkRandomScalerContext::generateGlyphCount() {
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return fProxy->getGlyphCount();
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}
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uint16_t SkRandomScalerContext::generateCharToGlyph(SkUnichar uni) {
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return fProxy->charToGlyphID(uni);
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}
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bool SkRandomScalerContext::generateAdvance(SkGlyph* glyph) {
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return fProxy->generateAdvance(glyph);
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}
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void SkRandomScalerContext::generateMetrics(SkGlyph* glyph) {
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// Here we will change the mask format of the glyph
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// NOTE: this may be overridden by the base class (e.g. if a mask filter is applied).
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switch (glyph->getGlyphID() % 4) {
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case 0: glyph->fMaskFormat = SkMask::kLCD16_Format; break;
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case 1: glyph->fMaskFormat = SkMask::kA8_Format; break;
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case 2: glyph->fMaskFormat = SkMask::kARGB32_Format; break;
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case 3: glyph->fMaskFormat = SkMask::kBW_Format; break;
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}
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fProxy->getMetrics(glyph);
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if (fFakeIt || (glyph->getGlyphID() % 4) != 2) {
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return;
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}
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SkPath path;
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if (!fProxy->getPath(glyph->getPackedID(), &path)) {
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return;
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}
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glyph->fMaskFormat = SkMask::kARGB32_Format;
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SkRect storage;
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const SkPaint& paint = this->getRandomTypeface()->paint();
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const SkRect& newBounds = paint.doComputeFastBounds(path.getBounds(),
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&storage,
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SkPaint::kFill_Style);
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SkIRect ibounds;
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newBounds.roundOut(&ibounds);
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glyph->fLeft = ibounds.fLeft;
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glyph->fTop = ibounds.fTop;
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glyph->fWidth = ibounds.width();
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glyph->fHeight = ibounds.height();
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}
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void SkRandomScalerContext::generateImage(const SkGlyph& glyph) {
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// TODO: can force down but not up
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/*
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SkMask::Format format = (SkMask::Format)glyph.fMaskFormat;
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switch (glyph.getGlyphID() % 4) {
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case 0: format = SkMask::kLCD16_Format; break;
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case 1: format = SkMask::kA8_Format; break;
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case 2: format = SkMask::kARGB32_Format; break;
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case 3: format = SkMask::kBW_Format; break;
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}
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const_cast<SkGlyph&>(glyph).fMaskFormat = format;
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*/
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if (fFakeIt) {
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sk_bzero(glyph.fImage, glyph.computeImageSize());
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return;
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}
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if (SkMask::kARGB32_Format != glyph.fMaskFormat) {
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fProxy->getImage(glyph);
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return;
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}
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// If the format is ARGB, just draw the glyph from path.
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SkPath path;
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if (!fProxy->getPath(glyph.getPackedID(), &path)) {
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fProxy->getImage(glyph);
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return;
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}
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SkBitmap bm;
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bm.installPixels(SkImageInfo::MakeN32Premul(glyph.fWidth, glyph.fHeight),
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glyph.fImage, glyph.rowBytes());
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bm.eraseColor(0);
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SkCanvas canvas(bm);
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canvas.translate(-SkIntToScalar(glyph.fLeft), -SkIntToScalar(glyph.fTop));
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canvas.drawPath(path, this->getRandomTypeface()->paint());
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}
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bool SkRandomScalerContext::generatePath(SkGlyphID glyph, SkPath* path) {
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return fProxy->generatePath(glyph, path);
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}
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void SkRandomScalerContext::generateFontMetrics(SkFontMetrics* metrics) {
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fProxy->getFontMetrics(metrics);
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}
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///////////////////////////////////////////////////////////////////////////////
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SkRandomTypeface::SkRandomTypeface(sk_sp<SkTypeface> proxy, const SkPaint& paint, bool fakeIt)
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: SkTypeface(proxy->fontStyle(), false)
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, fProxy(std::move(proxy))
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, fPaint(paint)
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, fFakeIt(fakeIt) {}
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SkScalerContext* SkRandomTypeface::onCreateScalerContext(const SkScalerContextEffects& effects,
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const SkDescriptor* desc) const {
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return new SkRandomScalerContext(sk_ref_sp(const_cast<SkRandomTypeface*>(this)),
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effects, desc, fFakeIt);
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}
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void SkRandomTypeface::onFilterRec(SkScalerContextRec* rec) const {
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fProxy->filterRec(rec);
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rec->setHinting(kNo_SkFontHinting);
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rec->fMaskFormat = SkMask::kARGB32_Format;
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}
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void SkRandomTypeface::getGlyphToUnicodeMap(SkUnichar* glyphToUnicode) const {
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fProxy->getGlyphToUnicodeMap(glyphToUnicode);
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}
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std::unique_ptr<SkAdvancedTypefaceMetrics> SkRandomTypeface::onGetAdvancedMetrics() const {
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return fProxy->getAdvancedMetrics();
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}
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SkStreamAsset* SkRandomTypeface::onOpenStream(int* ttcIndex) const {
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return fProxy->openStream(ttcIndex);
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}
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sk_sp<SkTypeface> SkRandomTypeface::onMakeClone(const SkFontArguments& args) const {
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sk_sp<SkTypeface> proxy = fProxy->makeClone(args);
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if (!proxy) {
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return nullptr;
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}
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return sk_make_sp<SkRandomTypeface>(proxy, fPaint, fFakeIt);
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}
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void SkRandomTypeface::onGetFontDescriptor(SkFontDescriptor* desc, bool* isLocal) const {
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// TODO: anything that uses this typeface isn't correctly serializable, since this typeface
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// cannot be deserialized.
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fProxy->getFontDescriptor(desc, isLocal);
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}
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int SkRandomTypeface::onCharsToGlyphs(const void* chars, Encoding encoding,
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uint16_t glyphs[], int glyphCount) const {
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return fProxy->charsToGlyphs(chars, encoding, glyphs, glyphCount);
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}
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int SkRandomTypeface::onCountGlyphs() const {
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return fProxy->countGlyphs();
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}
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int SkRandomTypeface::onGetUPEM() const {
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return fProxy->getUnitsPerEm();
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}
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void SkRandomTypeface::onGetFamilyName(SkString* familyName) const {
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fProxy->getFamilyName(familyName);
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}
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SkTypeface::LocalizedStrings* SkRandomTypeface::onCreateFamilyNameIterator() const {
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return fProxy->createFamilyNameIterator();
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}
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int SkRandomTypeface::onGetVariationDesignPosition(
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SkFontArguments::VariationPosition::Coordinate coordinates[], int coordinateCount) const
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{
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return fProxy->onGetVariationDesignPosition(coordinates, coordinateCount);
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}
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int SkRandomTypeface::onGetVariationDesignParameters(
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SkFontParameters::Variation::Axis parameters[], int parameterCount) const
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{
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return fProxy->onGetVariationDesignParameters(parameters, parameterCount);
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}
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int SkRandomTypeface::onGetTableTags(SkFontTableTag tags[]) const {
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return fProxy->getTableTags(tags);
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}
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size_t SkRandomTypeface::onGetTableData(SkFontTableTag tag, size_t offset,
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size_t length, void* data) const {
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return fProxy->getTableData(tag, offset, length, data);
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}
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