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Donner 0.5.0
Embeddable browser-grade SVG2 engine
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Donner 0.5.0
Embeddable browser-grade SVG2 engine
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Public Member Functions | |
| MOCK_METHOD (FontVMetrics, fontVMetrics,(FontHandle),(const, override)) | |
| MOCK_METHOD (float, scaleForPixelHeight,(FontHandle, float),(const, override)) | |
| MOCK_METHOD (float, scaleForEmToPixels,(FontHandle, float),(const, override)) | |
| MOCK_METHOD (std::optional< UnderlineMetrics >, underlineMetrics,(FontHandle),(const, override)) | |
| MOCK_METHOD (std::optional< UnderlineMetrics >, strikeoutMetrics,(FontHandle),(const, override)) | |
| MOCK_METHOD (std::optional< SubSuperMetrics >, subSuperMetrics,(FontHandle),(const, override)) | |
| MOCK_METHOD (Path, glyphOutline,(FontHandle, int, float),(const, override)) | |
| MOCK_METHOD (bool, isBitmapOnly,(FontHandle),(const, override)) | |
| MOCK_METHOD (bool, isCursive,(uint32_t),(const, override)) | |
| MOCK_METHOD (bool, hasSmallCapsFeature,(FontHandle),(const, override)) | |
| MOCK_METHOD (std::optional< BitmapGlyph >, bitmapGlyph,(FontHandle, int, float),(const, override)) | |
| MOCK_METHOD (ShapedRun, shapeRun,(FontHandle, float, std::string_view, size_t, size_t, bool, FontVariant, bool),(const, override)) | |
| MOCK_METHOD (double, crossSpanKern,(FontHandle, float, FontHandle, float, uint32_t, uint32_t, bool),(const, override)) | |
| Public Member Functions inherited from donner::svg::TextBackend | |
| virtual FontVMetrics | fontVMetrics (FontHandle font) const =0 |
| Vertical metrics (ascent, descent, lineGap) in font design units. | |
| virtual float | scaleForPixelHeight (FontHandle font, float pixelHeight) const =0 |
| Scale factor: font design units → pixels, normalized to ascent−descent height. This is stbtt_ScaleForPixelHeight semantics. | |
| virtual float | scaleForEmToPixels (FontHandle font, float pixelHeight) const =0 |
| Scale factor: em units → pixels. Differs from scaleForPixelHeight when ascent−descent != unitsPerEm. This is the correct scale for CSS font-size. | |
| virtual std::optional< UnderlineMetrics > | underlineMetrics (FontHandle font) const =0 |
| Underline position/thickness from the 'post' table, in font design units. Returns std::nullopt if the table is missing. | |
| virtual std::optional< UnderlineMetrics > | strikeoutMetrics (FontHandle font) const =0 |
| Strikeout position/thickness from the OS/2 table, in font design units. Returns std::nullopt if the table is missing. | |
| virtual std::optional< SubSuperMetrics > | subSuperMetrics (FontHandle font) const =0 |
| Sub/superscript Y offsets from the OS/2 table, in font design units. Returns std::nullopt if the table is missing. | |
| virtual Path | glyphOutline (FontHandle font, int glyphIndex, float scale) const =0 |
Extract a glyph outline as a Path. Coordinates are in font units scaled by scale, with Y flipped for SVG's y-down convention. | |
| virtual bool | isBitmapOnly (FontHandle font) const =0 |
| Returns true if the font is bitmap-only (no vector outlines). | |
| virtual bool | isCursive (uint32_t codepoint) const =0 |
| Returns true if letter-spacing should be suppressed for this codepoint (cursive/connected scripts like Arabic). Simple backends return false. | |
| virtual bool | hasSmallCapsFeature (FontHandle font) const =0 |
| Returns true if the font has a native OpenType small-caps feature (smcp). If false, the engine synthesizes small-caps via uppercase + reduced size. | |
| virtual std::optional< BitmapGlyph > | bitmapGlyph (FontHandle font, int glyphIndex, float scale) const =0 |
| Extract a bitmap glyph (CBDT/CBLC color emoji). Returns std::nullopt if the glyph is not a bitmap. Simple backends always return std::nullopt. | |
| virtual ShapedRun | shapeRun (FontHandle font, float fontSizePx, std::string_view spanText, size_t byteOffset, size_t byteLength, bool isVertical, FontVariant fontVariant, bool forceLogicalOrder) const =0 |
| Shape a range of text, producing glyph IDs with advances and kerning. | |
| virtual double | crossSpanKern (FontHandle prevFont, float prevSizePx, FontHandle curFont, float curSizePx, uint32_t prevCodepoint, uint32_t curCodepoint, bool isVertical) const =0 |
| Compute cross-span kerning between the last codepoint of the previous span and the first codepoint of the current span. | |
1.15.0