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35 lines
1.5 KiB
C++
35 lines
1.5 KiB
C++
#pragma once
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#include "EpdFontData.h"
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class EpdFont {
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void getTextBounds(const char* string, int startX, int startY, int* minX, int* minY, int* maxX, int* maxY) const;
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public:
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const EpdFontData* data;
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explicit EpdFont(const EpdFontData* data) : data(data) {}
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~EpdFont() = default;
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void getTextDimensions(const char* string, int* w, int* h) const;
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const EpdGlyph* getGlyph(uint32_t cp) const;
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/// Returns true if this font covers `cp`: either via its in-RAM interval
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/// table or, for SD card fonts, via the coverageHandler that consults the
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/// full RAM-resident coverage index. Unlike getGlyph(), it never performs
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/// storage I/O and never falls back to the replacement glyph — it reports
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/// only what this font can render. Used by the CJK UI font fallback to
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/// decide whether a string needs to be routed to another font.
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bool hasCodepoint(uint32_t cp) const;
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/// Returns the kerning adjustment (4.4 fixed-point in pixels) between two codepoints.
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/// Returns 0 if no kerning data exists for the pair.
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int8_t getKerning(uint32_t leftCp, uint32_t rightCp) const;
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/// Returns the ligature codepoint for a pair, or 0 if no ligature exists.
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uint32_t getLigature(uint32_t leftCp, uint32_t rightCp) const;
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/// Greedily applies ligature substitutions starting from cp, consuming
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/// as many following codepoints from text as possible. Returns the
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/// (possibly substituted) codepoint; advances text past consumed chars.
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uint32_t applyLigatures(uint32_t cp, const char*& text) const;
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};
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