TextBackend.h File Reference

#include <optional>
#include "donner/svg/core/FontVariant.h"
#include "donner/base/Path.h"
#include "donner/svg/resources/FontManager.h"

Include dependency graph for TextBackend.h:

This graph shows which files directly or indirectly include this file:

Classes
struct	donner::svg::FontVMetrics
	Font vertical metrics in font design units (unscaled). More...
struct	donner::svg::UnderlineMetrics
	Line decoration positioning metrics in font design units. More...
struct	donner::svg::SubSuperMetrics
	Sub/superscript Y offsets from the OS/2 table, in font design units. More...
class	donner::svg::TextBackend
	Abstract font backend for text rendering operations. More...
struct	donner::svg::TextBackend::BitmapGlyph
	Bitmap glyph data from color fonts (CBDT/CBLC). More...
struct	donner::svg::TextBackend::ShapedGlyph
	A single shaped glyph with advance and cluster info. More...
struct	donner::svg::TextBackend::ShapedRun
	Result of shaping a text range. More...

Namespaces
namespace	donner
	Top-level Donner namespace, which is split into different sub-namespaces such as donner::svg and donner::css.
namespace	donner::svg
	Donner SVG library, which can load, manipulate and render SVG files.

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Class Documentation

donner::svg::FontVMetrics

struct donner::svg::FontVMetrics

Font vertical metrics in font design units (unscaled).

Class Members
int	ascent = 0	Positive, above baseline.
int	descent = 0	Negative, below baseline.
int	lineGap = 0

donner::svg::UnderlineMetrics

struct donner::svg::UnderlineMetrics

Line decoration positioning metrics in font design units.

Class Members
double	position = 0	Signed offset from baseline in font design units (negative = below).
double	thickness = 0	Stroke thickness in font design units.

donner::svg::SubSuperMetrics

struct donner::svg::SubSuperMetrics

Sub/superscript Y offsets from the OS/2 table, in font design units.

Class Members
int	subscriptYOffset = 0
int	superscriptYOffset = 0

donner::svg::TextBackend::BitmapGlyph

struct donner::svg::TextBackend::BitmapGlyph

Bitmap glyph data from color fonts (CBDT/CBLC).

Collaboration diagram for donner::svg::TextBackend::BitmapGlyph:

Class Members
double	bearingX = 0	Horizontal offset from glyph origin.
double	bearingY = 0	Vertical offset from baseline (positive = up).
int	height = 0	Bitmap height in pixels.
vector< uint8_t >	rgbaPixels	RGBA pixel data (premultiplied alpha).
double	scale = 1.0	Scale factor to apply.
int	width = 0	Bitmap width in pixels.

donner::svg::TextBackend::ShapedGlyph

struct donner::svg::TextBackend::ShapedGlyph

A single shaped glyph with advance and cluster info.

Class Members
uint32_t	cluster = 0	Byte offset into the shaped text range.
float	fontSizeScale = 1.0f	< 1.0 for synthesized small-caps glyphs.
int	glyphIndex = 0	Backend-specific glyph ID.
double	xAdvance = 0	Nominal horizontal advance (without kerning).
double	xKern = 0	Kerning adjustment to apply before this glyph.
double	xOffset = 0	Horizontal offset (GPOS mark positioning; 0 for simple).
double	yAdvance = 0	Nominal vertical advance (without kerning).
double	yKern = 0	Kerning adjustment (vertical mode).
double	yOffset = 0	Vertical offset (GPOS mark positioning; 0 for simple).

donner::svg::TextBackend::ShapedRun

struct donner::svg::TextBackend::ShapedRun

Result of shaping a text range.

Collaboration diagram for donner::svg::TextBackend::ShapedRun:

Class Members
vector< ShapedGlyph >	glyphs