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/*
* Copyright 2018 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkRemoteTypeface_DEFINED
#define SkRemoteTypeface_DEFINED
#include "SkAdvancedTypefaceMetrics.h"
#include "SkDescriptor.h"
#include "SkFontDescriptor.h"
#include "SkFontStyle.h"
#include "SkPaint.h"
#include "SkScalerContext.h"
#include "SkTypeface.h"
class SkStrikeClient;
class SkTypefaceProxy;
class SkScalerContextProxy : public SkScalerContext {
public:
SkScalerContextProxy(
sk_sp<SkTypeface> tf,
const SkScalerContextEffects& effects,
const SkDescriptor* desc,
SkStrikeClient* rsc);
protected:
unsigned generateGlyphCount() override;
uint16_t generateCharToGlyph(SkUnichar) override;
void generateAdvance(SkGlyph* glyph) override;
void generateMetrics(SkGlyph* glyph) override;
void generateImage(const SkGlyph& glyph) override;
bool generatePath(SkGlyphID glyphID, SkPath* path) override;
void generateFontMetrics(SkPaint::FontMetrics* metrics) override;
private:
// Copied from SkGlyphCache
// so we don't grow our arrays a lot
static constexpr size_t kMinGlyphCount = 8;
static constexpr size_t kMinGlyphImageSize = 16 /* height */ * 8 /* width */;
static constexpr size_t kMinAllocAmount = kMinGlyphImageSize * kMinGlyphCount;
SkTypefaceProxy* typefaceProxy();
SkArenaAlloc fAlloc{kMinAllocAmount};
SkStrikeClient* const fClient;
typedef SkScalerContext INHERITED;
};
class SkTypefaceProxy : public SkTypeface {
public:
SkTypefaceProxy(
SkFontID fontId,
int glyphCount,
const SkFontStyle& style,
bool isFixed,
SkStrikeClient* rsc)
: INHERITED{style, false}
, fFontId{fontId}
, fGlyphCount{glyphCount}
, fRsc{rsc} { }
SkFontID remoteTypefaceID() const {return fFontId;}
int glyphCount() const {return fGlyphCount;}
static SkTypefaceProxy* DownCast(SkTypeface* typeface) {
// TODO: how to check the safety of the down cast?
return (SkTypefaceProxy*)typeface;
}
protected:
int onGetUPEM() const override { SK_ABORT("Should never be called."); return 0; }
SkStreamAsset* onOpenStream(int* ttcIndex) const override {
SK_ABORT("Should never be called.");
return nullptr;
}
std::unique_ptr<SkFontData> onMakeFontData() const override {
SK_ABORT("Should never be called.");
return nullptr;
}
int onGetVariationDesignPosition(SkFontArguments::VariationPosition::Coordinate coordinates[],
int coordinateCount) const override {
SK_ABORT("Should never be called.");
return 0;
}
void onGetFamilyName(SkString* familyName) const override {
SK_ABORT("Should never be called.");
}
SkTypeface::LocalizedStrings* onCreateFamilyNameIterator() const override {
SK_ABORT("Should never be called.");
return nullptr;
}
int onGetTableTags(SkFontTableTag tags[]) const override {
SK_ABORT("Should never be called.");
return 0;
}
size_t onGetTableData(SkFontTableTag, size_t offset, size_t length, void* data) const override {
SK_ABORT("Should never be called.");
return 0;
}
SkScalerContext* onCreateScalerContext(const SkScalerContextEffects& effects,
const SkDescriptor* desc) const override {
return new SkScalerContextProxy(sk_ref_sp(const_cast<SkTypefaceProxy*>(this)), effects,
desc, fRsc);
}
void onFilterRec(SkScalerContextRec* rec) const override {
// Add all the device information here.
//rec->fPost2x2[0][0] = 0.5f;
// This would be the best place to run the host SkTypeface_* onFilterRec.
// Can we move onFilterRec to the FongMgr, that way we don't need to cross the boundary to
// filter.
}
void onGetFontDescriptor(SkFontDescriptor*, bool*) const override {
SK_ABORT("Should never be called.");
}
std::unique_ptr<SkAdvancedTypefaceMetrics> onGetAdvancedMetrics() const override {
SK_ABORT("Should never be called.");
return nullptr;
}
int onCharsToGlyphs(const void* chars, Encoding,
uint16_t glyphs[], int glyphCount) const override {
SK_ABORT("Should never be called.");
return 0;
}
int onCountGlyphs() const override {
SK_ABORT("Should never be called.");
return 0;
}
void* onGetCTFontRef() const override {
SK_ABORT("Should never be called.");
return nullptr;
}
private:
const SkFontID fFontId;
const int fGlyphCount;
SkStrikeClient* const fRsc;
typedef SkTypeface INHERITED;
};
#endif // SkRemoteTypeface_DEFINED
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