forked from minhngoc25a/freetype2
Add types required for 'COLR' v1 to public API (#59703).
* include/freetype/freetype.h (FT_PaintFormat, FT_ColorStopIterator, FT_ColorIndex, FT_ColorStop, FT_PaintExtend, FT_ColorLine, FT_Affine23, FT_CompositeMode, FT_OpaquePaint, FT_PaintColrLayers, FT_PaintSolid, FT_PaintLinearGradient, FT_PaintRadialGradient, FT_PaintGlyph, FT_PaintColrGlyph, FT_PaintTransformed, FT_PaintTranslate, FT_PaintRotate, FT_PaintSkew, FT_PaintComposite, FT_COLR_Paint): Adding structs and enum to represent paint format, color stop information, gradient extend information, structs to reference paint offsets, and to define transforms and compositions. Adding a union type to represent the union of the structs, distinguished by `FT_PaintFormat`.
This commit is contained in:
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ChangeLog
16
ChangeLog
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@ -1,3 +1,19 @@
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2020-12-16 Dominik Röttsches <drott@chromium.org>
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Add types required for 'COLR' v1 to public API (#59703).
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* include/freetype/freetype.h (FT_PaintFormat, FT_ColorStopIterator,
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FT_ColorIndex, FT_ColorStop, FT_PaintExtend, FT_ColorLine,
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FT_Affine23, FT_CompositeMode, FT_OpaquePaint, FT_PaintColrLayers,
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FT_PaintSolid, FT_PaintLinearGradient, FT_PaintRadialGradient,
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FT_PaintGlyph, FT_PaintColrGlyph, FT_PaintTransformed,
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FT_PaintTranslate, FT_PaintRotate, FT_PaintSkew, FT_PaintComposite,
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FT_COLR_Paint): Adding structs and enum to represent paint format,
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color stop information, gradient extend information, structs to
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reference paint offsets, and to define transforms and compositions.
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Adding a union type to represent the union of the structs,
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distinguished by `FT_PaintFormat`.
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2021-01-10 Werner Lemberg <wl@gnu.org>
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* builds/*: s/BUILD_DIR/PLATFORM_DIR/.
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@ -2902,7 +2902,7 @@ FT_BEGIN_HEADER
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*
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* If the font is 'tricky' (see @FT_FACE_FLAG_TRICKY for more), using
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* `FT_LOAD_NO_SCALE` usually yields meaningless outlines because the
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* subglyphs must be scaled and positioned with hinting instructions.
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* subglyphs must be scaled and positioned with hinting instructions.
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* This can be solved by loading the font without `FT_LOAD_NO_SCALE`
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* and setting the character size to `font->units_per_EM`.
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*
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@ -4219,6 +4219,666 @@ FT_BEGIN_HEADER
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FT_LayerIterator* iterator );
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/**************************************************************************
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*
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* @enum:
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* FT_PaintFormat
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*
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* @description:
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* Enumeration describing the different gradient types of the v1
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* extensions to the 'COLR' table, see
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* 'https://github.com/googlefonts/colr-gradients-spec'.
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*/
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typedef enum FT_PaintFormat_
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{
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FT_COLR_PAINTFORMAT_COLR_LAYERS = 1,
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FT_COLR_PAINTFORMAT_SOLID = 2,
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FT_COLR_PAINTFORMAT_LINEAR_GRADIENT = 3,
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FT_COLR_PAINTFORMAT_RADIAL_GRADIENT = 4,
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FT_COLR_PAINTFORMAT_GLYPH = 5,
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FT_COLR_PAINTFORMAT_COLR_GLYPH = 6,
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FT_COLR_PAINTFORMAT_TRANSFORMED = 7,
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FT_COLR_PAINTFORMAT_TRANSLATE = 8,
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FT_COLR_PAINTFORMAT_ROTATE = 9,
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FT_COLR_PAINTFORMAT_SKEW = 10,
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FT_COLR_PAINTFORMAT_COMPOSITE = 11,
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FT_COLR_PAINT_FORMAT_MAX = 12,
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FT_COLR_PAINTFORMAT_UNSUPPORTED = 255
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} FT_PaintFormat;
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/**************************************************************************
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*
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* @struct:
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* FT_ColorStopIterator
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*
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* @description:
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* This iterator object is needed for @FT_Get_Colorline_Stops. It keeps
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* state while iterating over the stops of an @FT_ColorLine,
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* representing the `ColorLine` struct of the v1 extensions to 'COLR',
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* see 'https://github.com/googlefonts/colr-gradients-spec'.
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*
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* @fields:
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* num_color_stops ::
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* The number of color stops for the requested glyph index. Set by
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* @FT_Get_Colorline_Stops.
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*
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* current_color_stop ::
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* The current color stop. Set by @FT_Get_Colorline_Stops.
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*
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* p ::
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* An opaque pointer into 'COLR' table data. The caller must set this
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* to `NULL` before the first call of @FT_Get_Colorline_Stops.
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*/
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typedef struct FT_ColorStopIterator_
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{
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FT_UInt num_color_stops;
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FT_UInt current_color_stop;
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FT_Byte* p;
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} FT_ColorStopIterator;
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/**************************************************************************
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*
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* @struct:
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* FT_ColorIndex
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*
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* @description:
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* A structure representing a `ColorIndex` value of the 'COLR' v1
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* extensions, see 'https://github.com/googlefonts/colr-gradients-spec'.
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*
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* @fields:
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* palette_index ::
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* The palette index into a 'CPAL' palette.
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*
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* alpha ::
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* Alpha transparency value multiplied with the value from 'CPAL'.
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*/
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typedef struct FT_ColorIndex_
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{
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FT_UInt16 palette_index;
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FT_F2Dot14 alpha;
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} FT_ColorIndex;
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/**************************************************************************
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*
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* @struct:
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* FT_ColorStop
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*
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* @description:
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* A structure representing a `ColorStop` value of the 'COLR' v1
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* extensions, see 'https://github.com/googlefonts/colr-gradients-spec'.
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*
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* @fields:
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* stop_offset ::
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* The stop offset between 0 and 1 along the gradient.
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*
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* color ::
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* The color information for this stop, see @FT_ColorIndex.
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*/
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typedef struct FT_ColorStop_
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{
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FT_F2Dot14 stop_offset;
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FT_ColorIndex color;
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} FT_ColorStop;
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/**************************************************************************
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*
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* @enum:
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* FT_PaintExtend
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*
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* @description:
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* An enumeration representing the 'Extend' mode of the 'COLR' v1
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* extensions, see 'https://github.com/googlefonts/colr-gradients-spec'.
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* It describes how the gradient fill continues at the other boundaries.
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*/
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typedef enum FT_PaintExtend_
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{
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FT_COLR_PAINT_EXTEND_PAD = 0,
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FT_COLR_PAINT_EXTEND_REPEAT = 1,
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FT_COLR_PAINT_EXTEND_REFLECT = 2
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} FT_PaintExtend;
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/**************************************************************************
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*
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* @struct:
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* FT_ColorLine
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*
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* @description:
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* A structure representing a `ColorLine` value of the 'COLR' v1
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* extensions, see 'https://github.com/googlefonts/colr-gradients-spec'.
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* It describes a list of color stops along the defined gradient.
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*
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* @fields:
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* extend ::
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* The extend mode at the outer boundaries, see @FT_PaintExtend.
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*
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* color_stop_iterator ::
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* The @FT_ColorStopIterator used to enumerate and retrieve the
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* actual @FT_ColorStop's.
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*/
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typedef struct FT_ColorLine_
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{
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FT_PaintExtend extend;
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FT_ColorStopIterator color_stop_iterator;
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} FT_ColorLine;
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/**************************************************************************
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*
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* @struct:
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* FT_Affine23
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*
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* @description:
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* A structure used to store a 2x3 matrix. Coefficients are in
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* 16.16 fixed-point format. The computation performed is
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*
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* ```
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* x' = x*xx + y*xy + dx
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* y' = x*yx + y*yy + dy
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* ```
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*
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* @fields:
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* xx ::
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* Matrix coefficient.
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*
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* xy ::
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* Matrix coefficient.
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*
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* dx ::
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* x translation.
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*
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* yx ::
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* Matrix coefficient.
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*
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* yy ::
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* Matrix coefficient.
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*
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* dy ::
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* y translation.
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*
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*/
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typedef struct FT_Affine_23_
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{
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FT_Fixed xx, xy, dx;
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FT_Fixed yx, yy, dy;
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} FT_Affine23;
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/**************************************************************************
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*
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* @enum:
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* FT_Composite_Mode
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*
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* @description:
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* An enumeration listing the 'COLR' v1 composite modes used in
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* @FT_PaintComposite. For more details on each paint mode, see
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* 'https://www.w3.org/TR/compositing-1/#porterduffcompositingoperators'.
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*/
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typedef enum FT_Composite_Mode_
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{
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FT_COLR_COMPOSITE_CLEAR = 0,
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FT_COLR_COMPOSITE_SRC = 1,
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FT_COLR_COMPOSITE_DEST = 2,
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FT_COLR_COMPOSITE_SRC_OVER = 3,
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FT_COLR_COMPOSITE_DEST_OVER = 4,
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FT_COLR_COMPOSITE_SRC_IN = 5,
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FT_COLR_COMPOSITE_DEST_IN = 6,
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FT_COLR_COMPOSITE_SRC_OUT = 7,
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FT_COLR_COMPOSITE_DEST_OUT = 8,
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FT_COLR_COMPOSITE_SRC_ATOP = 9,
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FT_COLR_COMPOSITE_DEST_ATOP = 10,
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FT_COLR_COMPOSITE_XOR = 11,
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FT_COLR_COMPOSITE_SCREEN = 12,
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FT_COLR_COMPOSITE_OVERLAY = 13,
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FT_COLR_COMPOSITE_DARKEN = 14,
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FT_COLR_COMPOSITE_LIGHTEN = 15,
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FT_COLR_COMPOSITE_COLOR_DODGE = 16,
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FT_COLR_COMPOSITE_COLOR_BURN = 17,
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FT_COLR_COMPOSITE_HARD_LIGHT = 18,
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FT_COLR_COMPOSITE_SOFT_LIGHT = 19,
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FT_COLR_COMPOSITE_DIFFERENCE = 20,
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FT_COLR_COMPOSITE_EXCLUSION = 21,
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FT_COLR_COMPOSITE_MULTIPLY = 22,
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FT_COLR_COMPOSITE_HSL_HUE = 23,
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FT_COLR_COMPOSITE_HSL_SATURATION = 24,
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FT_COLR_COMPOSITE_HSL_COLOR = 25,
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FT_COLR_COMPOSITE_HSL_LUMINOSITY = 26,
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FT_COLR_COMPOSITE_MAX = 27
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} FT_Composite_Mode;
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/**************************************************************************
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*
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* @struct:
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* FT_OpaquePaint
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*
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* @description:
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* A structure representing an offset to a `Paint` value stored in any
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* of the paint tables of a 'COLR' v1 font. Compare Offset<24> there.
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* When 'COLR' v1 paint tables represented by FreeType objects such as
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* @FT_PaintColrLayers, @FT_PaintComposite, or @FT_PaintTransformed
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* reference downstream nested paint tables, we do not immediately
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* retrieve them but encapsulate their location in this type. Use
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* @FT_Get_Paint to retrieve the actual @FT_COLR_Paint object that
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* describes the details of the respective paint table.
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*
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* @fields:
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* p ::
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* An internal offset to a Paint table, needs to be set to NULL before
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* passing this struct as an argument to @FT_Get_Paint.
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*/
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typedef struct FT_Opaque_Paint_
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{
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FT_Byte* p;
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} FT_OpaquePaint;
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/**************************************************************************
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*
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* @struct:
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* FT_PaintColrLayers
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*
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* @description:
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* A structure representing a `PaintColrLayers` table of a 'COLR' v1
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* font. This table describes a set of layers that are to be composited
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* with composite mode `FT_COLR_COMPOSITE_SRC_OVER`. The return value
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* of this function is an @FT_LayerIterator initialized so that it can
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* be used with @FT_Get_Paint_Layers to retrieve the @FT_OpaquePaint
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* objects as references to each layer.
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*
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* @fields:
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* layer_iterator ::
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* The layer iterator that describes the layers of this paint.
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*/
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typedef struct FT_PaintColrLayers_
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{
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FT_LayerIterator layer_iterator;
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} FT_PaintColrLayers;
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/**************************************************************************
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*
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* @struct:
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* FT_PaintSolid
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*
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* @description:
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* A structure representing a `PaintSolid` value of the 'COLR' v1
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* extensions, see 'https://github.com/googlefonts/colr-gradients-spec'.
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* Using a `PaintSolid` value means that the glyph layer filled with
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* this paint is solid-colored and does not contain a gradient.
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*
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* @fields:
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* color ::
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* The color information for this solid paint, see @FT_ColorIndex.
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*/
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typedef struct FT_PaintSolid_
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{
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FT_ColorIndex color;
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} FT_PaintSolid;
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/**************************************************************************
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*
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* @struct:
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* FT_PaintLinearGradient
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*
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* @description:
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* A structure representing a `PaintLinearGradient` value of the 'COLR'
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* v1 extensions, see
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* 'https://github.com/googlefonts/colr-gradients-spec'. The glyph
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* layer filled with this paint is drawn filled with a linear gradient.
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*
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* @fields:
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* colorline ::
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* The @FT_ColorLine information for this paint, i.e., the list of
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* color stops along the gradient.
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*
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* p0 ::
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* The starting point of the gradient definition (in font units).
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*
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* p1 ::
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* The end point of the gradient definition (in font units).
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*
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* p2 ::
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* Optional point~p2 to rotate the gradient (in font units).
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* Otherwise equal to~p0.
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*/
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typedef struct FT_PaintLinearGradient_
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{
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FT_ColorLine colorline;
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/* TODO: Potentially expose those as x0, y0 etc. */
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FT_Vector p0;
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FT_Vector p1;
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FT_Vector p2;
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} FT_PaintLinearGradient;
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/**************************************************************************
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*
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* @struct:
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* FT_PaintRadialGradient
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*
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* @description:
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* A structure representing a `PaintRadialGradient` value of the 'COLR'
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* v1 extensions, see
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* 'https://github.com/googlefonts/colr-gradients-spec'. The glyph
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* layer filled with this paint is drawn filled filled with a radial
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* gradient.
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*
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* @fields:
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* colorline ::
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* The @FT_ColorLine information for this paint, i.e., the list of
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* color stops along the gradient.
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*
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* c0 ::
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* The center of the starting point of the radial gradient (in font
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* units).
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*
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* r0 ::
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* The radius of the starting circle of the radial gradient (in font
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* units).
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*
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* c1 ::
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* The center of the end point of the radial gradient (in font units).
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*
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* r1 ::
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* The radius of the end circle of the radial gradient (in font
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* units).
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*/
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typedef struct FT_PaintRadialGradient_
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{
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FT_ColorLine colorline;
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/* TODO: Potentially expose those as x0, y0 etc. */
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FT_Vector c0;
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FT_UShort r0;
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FT_Vector c1;
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FT_UShort r1;
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} FT_PaintRadialGradient;
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/**************************************************************************
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*
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* @struct:
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* FT_PaintGlyph
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*
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* @description:
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* A structure representing a 'COLR' v1 `PaintGlyph` paint table.
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*
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* @fields:
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* paint ::
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* An opaque paint object pointing to a `Paint` table that serves as
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* the fill for the glyph ID.
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*
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* glyphID ::
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* The glyph ID from the 'glyf' table, which serves as the contour
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* information that is filled with paint.
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*
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*/
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typedef struct FT_PaintGlyph_
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{
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FT_OpaquePaint paint;
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FT_UInt glyphID;
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} FT_PaintGlyph;
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/**************************************************************************
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*
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* @struct:
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* FT_PaintColrGlyph
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*
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* @description:
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* A structure representing a 'COLR' v1 `PaintColorGlyph` paint table.
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*
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* @fields:
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* glyphID ::
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* The glyph ID from the `BaseGlyphV1List` table that is drawn for
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* this paint.
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*/
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typedef struct FT_PaintColrGlyph_
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{
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FT_UInt glyphID;
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} FT_PaintColrGlyph;
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/**************************************************************************
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*
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* @struct:
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* FT_PaintTransformed
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*
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* @description:
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* A structure representing a 'COLR' v1 `PaintTransformed` paint table.
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*
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* @fields:
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* paint ::
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* An opaque paint that is subject to being transformed.
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*
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* affine ::
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* A 2x3 transformation matrix in @FT_Affine23 format.
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*/
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typedef struct FT_PaintTransformed_
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{
|
||||
FT_OpaquePaint paint;
|
||||
FT_Affine23 affine;
|
||||
|
||||
} FT_PaintTransformed;
|
||||
|
||||
|
||||
/**************************************************************************
|
||||
*
|
||||
* @struct:
|
||||
* FT_PaintTranslate
|
||||
*
|
||||
* @description:
|
||||
* A structure representing a 'COLR' v1 `PaintTranslate` paint table.
|
||||
* Used for translating downstream paints by a given x and y~delta.
|
||||
*
|
||||
* @fields:
|
||||
* paint ::
|
||||
* An @FT_OpaquePaint object referencing the paint that is to be
|
||||
* rotated.
|
||||
*
|
||||
* dx ::
|
||||
* Translation in x~direction (in font units).
|
||||
*
|
||||
* dy ::
|
||||
* Translation in y~direction (in font units).
|
||||
*/
|
||||
typedef struct FT_PaintTranslate_
|
||||
{
|
||||
FT_OpaquePaint paint;
|
||||
|
||||
FT_Fixed dx;
|
||||
FT_Fixed dy;
|
||||
|
||||
} FT_PaintTranslate;
|
||||
|
||||
|
||||
/**************************************************************************
|
||||
*
|
||||
* @struct:
|
||||
* FT_PaintRotate
|
||||
*
|
||||
* @description:
|
||||
* A structure representing a 'COLR' v1 `PaintRotate` paint table. Used
|
||||
* for rotating downstream paints with a given center and angle.
|
||||
*
|
||||
* @fields:
|
||||
* paint ::
|
||||
* An @FT_OpaquePaint object referencing the paint that is to be
|
||||
* rotated.
|
||||
*
|
||||
* angle ::
|
||||
* The rotation angle that is to be applied.
|
||||
*
|
||||
* center_x ::
|
||||
* The x~coordinate of the pivot point of the rotation (in font
|
||||
* units).
|
||||
*
|
||||
* center_y ::
|
||||
* The y~coordinate of the pivot point of the rotation (in font
|
||||
* units).
|
||||
*/
|
||||
|
||||
typedef struct FT_PaintRotate_
|
||||
{
|
||||
FT_OpaquePaint paint;
|
||||
|
||||
FT_Fixed angle;
|
||||
|
||||
FT_Fixed center_x;
|
||||
FT_Fixed center_y;
|
||||
|
||||
} FT_PaintRotate;
|
||||
|
||||
|
||||
/**************************************************************************
|
||||
*
|
||||
* @struct:
|
||||
* FT_PaintSkew
|
||||
*
|
||||
* @description:
|
||||
* A structure representing a 'COLR' v1 `PaintSkew` paint table. Used
|
||||
* for skewing or shearing downstream paints by a given center and
|
||||
* angle.
|
||||
*
|
||||
* @fields:
|
||||
* paint ::
|
||||
* An @FT_OpaquePaint object referencing the paint that is to be
|
||||
* skewed.
|
||||
*
|
||||
* x_skew_angle ::
|
||||
* The skewing angle in x~direction.
|
||||
*
|
||||
* y_skew_angle ::
|
||||
* The skewing angle in y~direction.
|
||||
*
|
||||
* center_x ::
|
||||
* The x~coordinate of the pivot point of the skew (in font units).
|
||||
*
|
||||
* center_y ::
|
||||
* The y~coordinate of the pivot point of the skew (in font units).
|
||||
*/
|
||||
typedef struct FT_PaintSkew_
|
||||
{
|
||||
FT_OpaquePaint paint;
|
||||
|
||||
FT_Fixed x_skew_angle;
|
||||
FT_Fixed y_skew_angle;
|
||||
|
||||
FT_Fixed center_x;
|
||||
FT_Fixed center_y;
|
||||
|
||||
} FT_PaintSkew;
|
||||
|
||||
|
||||
/**************************************************************************
|
||||
*
|
||||
* @struct:
|
||||
* FT_PaintComposite
|
||||
*
|
||||
* @description:
|
||||
* A structure representing a 'COLR'v1 `PaintComposite` paint table.
|
||||
* Used for compositing two paints in a 'COLR' v1 directed acycling
|
||||
* graph.
|
||||
*
|
||||
* @fields:
|
||||
* source_paint ::
|
||||
* An @FT_OpaquePaint object referencing the source that is to be
|
||||
* composited.
|
||||
*
|
||||
* composite_mode ::
|
||||
* An @FT_Composite_Mode enum value determining the composition
|
||||
* operation.
|
||||
*
|
||||
* backdrop_paint ::
|
||||
* An @FT_OpaquePaint object referencing the backdrop paint that
|
||||
* `source_paint` is composited onto.
|
||||
*/
|
||||
typedef struct FT_PaintComposite_
|
||||
{
|
||||
FT_OpaquePaint source_paint;
|
||||
FT_Composite_Mode composite_mode;
|
||||
FT_OpaquePaint backdrop_paint;
|
||||
|
||||
} FT_PaintComposite;
|
||||
|
||||
|
||||
/**************************************************************************
|
||||
*
|
||||
* @union:
|
||||
* FT_COLR_Paint
|
||||
*
|
||||
* @description:
|
||||
* A union object representing format and details of a paint table of a
|
||||
* 'COLR' v1 font, see
|
||||
* 'https://github.com/googlefonts/colr-gradients-spec'. Use
|
||||
* @FT_Get_Paint to retrieve a @FT_COLR_Paint for an @FT_OpaquePaint
|
||||
* object.
|
||||
*
|
||||
* @fields:
|
||||
* format ::
|
||||
* The gradient format for this Paint structure.
|
||||
*
|
||||
* u ::
|
||||
* Union of all paint table types:
|
||||
*
|
||||
* * @FT_PaintColrLayers
|
||||
* * @FT_PaintGlyph
|
||||
* * @FT_PaintSolid
|
||||
* * @FT_PaintLinearGradient
|
||||
* * @FT_PaintRadialGradient
|
||||
* * @FT_PaintTransformed
|
||||
* * @FT_PaintTranslate
|
||||
* * @FT_PaintRotate
|
||||
* * @FT_PaintSkew
|
||||
* * @FT_PaintComposite
|
||||
* * @FT_PaintColrGlyph
|
||||
*/
|
||||
typedef struct FT_COLR_Paint_
|
||||
{
|
||||
FT_PaintFormat format;
|
||||
|
||||
union
|
||||
{
|
||||
FT_PaintColrLayers colr_layers;
|
||||
FT_PaintGlyph glyph;
|
||||
FT_PaintSolid solid;
|
||||
FT_PaintLinearGradient linear_gradient;
|
||||
FT_PaintRadialGradient radial_gradient;
|
||||
FT_PaintTransformed transformed;
|
||||
FT_PaintTranslate translate;
|
||||
FT_PaintRotate rotate;
|
||||
FT_PaintSkew skew;
|
||||
FT_PaintComposite composite;
|
||||
FT_PaintColrGlyph colr_glyph;
|
||||
|
||||
} u;
|
||||
|
||||
} FT_COLR_Paint;
|
||||
|
||||
|
||||
/**************************************************************************
|
||||
*
|
||||
* @section:
|
||||
|
|
Loading…
Reference in New Issue