skia2/docs/SkFont_Reference.bmh

#Topic Font
#Alias Font_Reference ##

#Code
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#PhraseDef font_metrics
Typeface, Font_Size, Font_Scale_X,
Font_Skew_X, Font_Hinting, Paint_Anti_Alias, Font_Embolden, Font_Force_Hinting,
Font_Embedded_Bitmaps, Font_Hinting_Spacing, Font_Anti_Alias, Font_Linear,
and Font_Subpixel
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#Subtopic Advance
# incomplete, should probably be in overview, not reference
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#Subtopic Engine
# incomplete, should probably be in overview, not reference
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#Subtopic Size
#Line # overall height in points ##
Font_Size adjusts the overall text size in points.
Font_Size can be set to any positive value or zero.
Font_Size defaults to 12.
Font_Size
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#Subtopic Scale_X
#Line # text horizontal scale ##
Font_Scale_X adjusts the text horizontal scale.
Text scaling approximates condensed and expanded type faces when the actual face
is not available.
Font_Scale_X can be set to any value.
Font_Scale_X defaults to 1.
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#Subtopic Skew_X
#Line # text horizontal slant ##
Font_Skew_X adjusts the text horizontal slant.
Text skewing approximates italic and oblique type faces when the actual face
is not available.
Font_Skew_X can be set to any value.
Font_Skew_X defaults to 0.
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#Subtopic Embolden
#Line # approximate font styles ##

Font_Embolden approximates the bold font style accompanying a normal font when a bold font face
is not available. Skia does not provide font substitution; it is up to the client to find the
bold font face using the platform Font_Manager.

Use Font_Skew_X to approximate an italic font style when the italic font face
is not available.

A FreeType based port may define SK_USE_FREETYPE_EMBOLDEN at compile time to direct
the font engine to create the bold Glyphs. Otherwise, the extra bold is computed
by increasing the stroke width and setting the SkPaint::Style to
SkPaint::kStrokeAndFill_Style as needed.

Font_Embolden is disabled by default.
#Subtopic Embolden ##

#Subtopic Hinting_Spacing
#Line # glyph spacing affected by hinting ##

If Hinting is set to SkFontHinting::kFull, Hinting_Spacing adjusts the character
spacing by the difference of the hinted and unhinted Left_Side_Bearing and
Right_Side_Bearing. Hinting_Spacing only applies to platforms that use
FreeType as their Font_Engine.

Hinting_Spacing is not related to text kerning, where the space between
a specific pair of characters is adjusted using data in the font kerning tables.
#Subtopic Hinting_Spacing ##

#Subtopic Linear
#Line # selects text rendering as Glyph or Path ##
Font_Linear selects whether text is rendered as a Glyph or as a Path.
If Font_Linear is set, it has the same effect as setting Hinting to SkFontHinting::kNormal.
If Font_Linear is clear, it is the same as setting Hinting to SkFontHinting::kNone.
#Subtopic Linear ##

#Subtopic Subpixel
#Line # uses pixel transparency to represent fractional offset ##
#Substitute sub-pixel
Font_Subpixel uses the pixel transparency to represent a fractional offset.
As the opaqueness of the color increases, the edge of the glyph appears to move
towards the outside of the pixel.
#Subtopic Subpixel ##

#Subtopic Anti_Alias
#Line # text relying on the order of RGB stripes ##
When set, Anti_Alias positions glyphs within a pixel, using alpha and
possibly RGB striping. It can take advantage of the organization of RGB stripes
that create a color, and relies on the small size of the stripe and visual perception
to make the color fringing imperceptible.

Anti_Alias can be enabled on devices that orient stripes horizontally
or vertically, and that order the color components as RGB or BGR. Internally, the
glyph cache may store multiple copies of the same glyph with different sub-pixel
positions, requiring more memory.
#Subtopic Anti_Alias ##

#Subtopic Force_Hinting
#Line # always adjust glyph paths ##

If Hinting is set to SkFontHinting::kNormal or SkFontHinting::kFull, Force_Hinting
instructs the Font_Manager to always hint Glyphs.
Force_Hinting has no effect if Hinting is set to SkFontHinting::kNone or
SkFontHinting::kSlight.

Force_Hinting only affects platforms that use FreeType as the Font_Manager.
#Subtopic Force_Hinting ##

#Subtopic Embedded_Bitmaps
#Line # custom sized bitmap Glyphs ##
Embedded_Bitmaps allows selecting custom sized bitmap Glyphs.
Embedded_Bitmaps when set chooses an embedded bitmap glyph over an outline contained
in a font if the platform supports this option.

FreeType selects the bitmap glyph if available when Embedded_Bitmaps is set, and selects
the outline glyph if Embedded_Bitmaps is clear.
Windows may select the bitmap glyph but is not required to do so.
OS_X and iOS do not support this option.
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# ------------------------------------------------------------------------------

#Class SkFont

SkFont controls options applied when drawing and measuring text.

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#EnumClass Edging

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Whether edge pixels draw opaque or with partial transparency.

#Const kAlias  0 # incomplete; replace '0' with member value
#Line # no transparent pixels on glyph edges ##
# incomplete; add description or delete
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#Const kAntiAlias  0 # incomplete; replace '0' with member value
#Line # may have transparent pixels on glyph edges ##
# incomplete; add description or delete
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#Const kSubpixelAntiAlias  0 # incomplete; replace '0' with member value
#Line # glyph positioned in pixel using transparency ##
# incomplete; add description or delete
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# incomplete; add description or delete

#Example
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#EnumClass ##

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#Method SkFont()
#In Constructor
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#Method SkFont(sk_sp<SkTypeface> typeface, SkScalar size)
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#Method SkFont(sk_sp<SkTypeface> typeface, SkScalar size, SkScalar scaleX, SkScalar skewX)
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#Method bool operator==(const SkFont& font) const
#In Operator
#Line # compares fonts for equality ##

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#Method bool isForceAutoHinting() const
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#Method bool isEmbeddedBitmaps() const
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#Method bool isSubpixel() const
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#Method bool isLinearMetrics() const
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#Method bool isEmbolden() const
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#Method void setForceAutoHinting(bool forceAutoHinting)
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#Method void setEmbeddedBitmaps(bool embeddedBitmaps)
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#Method void setSubpixel(bool subpixel)
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#Method void setLinearMetrics(bool linearMetrics)
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#Method void setEmbolden(bool embolden)
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#Method Edging getEdging() const
#In incomplete
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#Method void setEdging(Edging edging)
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#Method void setHinting(SkFontHinting hintingLevel)
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#Method SkFontHinting getHinting() const
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#Method SkFont makeWithSize(SkScalar size) const
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#Method SkTypeface* getTypeface() const
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#Method SkScalar    getSize() const
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#Method SkScalar    getScaleX() const
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#Method SkScalar    getSkewX() const
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#Method sk_sp<SkTypeface> refTypeface() const
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#Method void setTypeface(sk_sp<SkTypeface> tf)
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#Method void setSize(SkScalar textSize)
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#Method void setScaleX(SkScalar scaleX)
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#Method void setSkewX(SkScalar skewX)
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#Method int textToGlyphs(const void* text, size_t byteLength, SkTextEncoding encoding,
                     SkGlyphID glyphs[], int maxGlyphCount) const
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#Method uint16_t unicharToGlyph(SkUnichar uni) const
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#Method int countText(const void* text, size_t byteLength, SkTextEncoding encoding) const
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#Method bool containsText(const void* text, size_t byteLength, SkTextEncoding encoding) const
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#Method size_t breakText(const void* text, size_t length, SkTextEncoding encoding, SkScalar maxWidth,
                     SkScalar* measuredWidth = nullptr) const
#In  incomplete
#Line # incomplete ##
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#Example
    #Description
    Line under "Breakfast" shows desired width, shorter than available characters.
    Line under "Bre" shows measured width after breaking text.
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    #Height 128
    #Width 280
        void draw(SkCanvas* canvas) {
            SkPaint paint;
            paint.setAntiAlias(true);
            paint.setTextSize(50);
            const char str[] = "Breakfast";
            const int count = sizeof(str) - 1;
            canvas->drawText(str, count, 25, 50, paint);
            SkScalar measuredWidth;
            SkFont font;
            font.setSize(50);
            int partialBytes = font.breakText(str, count, kUTF8_SkTextEncoding,
                    100, &measuredWidth);
            canvas->drawText(str, partialBytes, 25, 100, paint);
            canvas->drawLine(25, 60, 25 + 100, 60, paint);
            canvas->drawLine(25, 110, 25 + measuredWidth, 110, paint);
        }
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#Method SkScalar measureText(const void* text, size_t byteLength, SkTextEncoding encoding,
                         SkRect* bounds = nullptr) const
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#Method bool getPath(uint16_t glyphID, SkPath* path) const
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#Method void getPaths(const uint16_t glyphIDs[], int count,
                  void (*glyphPathProc)(const SkPath* pathOrNull, const SkMatrix& mx, void* ctx),
                  void* ctx) const
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#Method SkScalar getMetrics(SkFontMetrics* metrics) const
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#Method SkScalar getSpacing() const
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#Class SkFont ##

#Topic Font ##