blob: e74911d98a26dcdd8ddadb8742b650f04a68d7ef [file] [log] [blame]
// Copyright 2019 Google LLC.
#ifndef FontIterator_DEFINED
#define FontIterator_DEFINED
#include "include/core/SkSpan.h"
#include "include/core/SkString.h"
#include "include/core/SkTypes.h"
#include "modules/skparagraph/include/TextStyle.h"
#include "modules/skshaper/include/SkShaper.h"
namespace skia {
namespace textlayout {
class LangIterator final : public SkShaper::LanguageRunIterator {
public:
LangIterator(SkSpan<const char> utf8, SkSpan<Block> styles, const TextStyle& defaultStyle)
: fText(utf8)
, fTextStyles(styles)
, fCurrentChar(utf8.begin())
, fCurrentStyle(fTextStyles.begin())
, fCurrentLocale(defaultStyle.getLocale()) {}
void consume() override {
SkASSERT(fCurrentChar < fText.end());
if (fCurrentStyle == fTextStyles.end()) {
fCurrentChar = fText.end();
return;
}
fCurrentChar = fText.begin() + fCurrentStyle->fRange.end;
fCurrentLocale = fCurrentStyle->fStyle.getLocale();
while (++fCurrentStyle != fTextStyles.end() && !fCurrentStyle->fStyle.isPlaceholder()) {
if (fCurrentStyle->fStyle.getLocale() != fCurrentLocale) {
break;
}
fCurrentChar = fText.begin() + fCurrentStyle->fRange.end;
}
}
size_t endOfCurrentRun() const override { return fCurrentChar - fText.begin(); }
bool atEnd() const override { return fCurrentChar >= fText.end(); }
const char* currentLanguage() const override { return fCurrentLocale.c_str(); }
private:
SkSpan<const char> fText;
SkSpan<Block> fTextStyles;
const char* fCurrentChar;
Block* fCurrentStyle;
SkString fCurrentLocale;
};
} // namespace textlayout
} // namespace skia
#endif // FontIterator_DEFINED