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[sfnt] Support PaintScale in 'COLR' v1 parsing. 

* include/freetype/ftcolor.h (FT_PaintFormat): Renumber values, add
`FT_COLR_PAINTFORMAT_SCALE`.
(FT_PaintScale): New structure to represent 'PaintScale*' tables.
(FT_COLR_Paint): Updated.

* src/sfnt/ttcolr.c (FT_PaintFormat_Internal): New enumeration.
(read_paint): Parse 'PaintScale' and friends.
This commit is contained in:
Dominik Röttsches 2021-06-22 15:01:19 +03:00 committed by Werner Lemberg
parent 0348c627b1
commit 286da6c528
3 changed files with 138 additions and 10 deletions
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12
ChangeLog
View File

@ -1,3 +1,15 @@
2021-06-30 Dominik Röttsches <drott@chromium.org>
[sfnt] Support PaintScale in 'COLR' v1 parsing.
* include/freetype/ftcolor.h (FT_PaintFormat): Renumber values, add
`FT_COLR_PAINTFORMAT_SCALE`.
(FT_PaintScale): New structure to represent 'PaintScale*' tables.
(FT_COLR_Paint): Updated.
* src/sfnt/ttcolr.c (FT_PaintFormat_Internal): New enumeration.
(read_paint): Parse 'PaintScale' and friends.
2021-06-30 Dominik Röttsches <drott@chromium.org>
[sfnt] Handle fonts without layer list in 'COLR' v1.

78
include/freetype/ftcolor.h
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@ -475,12 +475,18 @@ FT_BEGIN_HEADER
* extensions to the 'COLR' table, see
* 'https://github.com/googlefonts/colr-gradients-spec'.
*
* Only non-variable format identifiers are listed in this enumeration;
* as soon as support for variable 'COLR' v1 fonts is implemented,
* interpolation is performed dependent on axis coordinates, which are
* configured on the @FT_Face through @FT_Set_Var_Design_Coordinates.
* This implies that always static (interpolated) values are returned
* for both variable and non-variable formats.
* The enumeration values losely correspond with the format numbers of
* the specification: FreeType always returns a fully specified 'Paint'
* structure for the 'Transform', 'Translate', 'Scale', 'Rotate', and
* 'Skew' table types even though the specification has different formats
* depending on whether or not a center is specified, whether the scale
* is uniform in x and y~direction or not, etc. Also, only non-variable
* format identifiers are listed in this enumeration; as soon as support
* for variable 'COLR' v1 fonts is implemented, interpolation is
* performed dependent on axis coordinates, which are configured on the
* @FT_Face through @FT_Set_Var_Design_Coordinates. This implies that
* always static, readily interpolated values are returned in the 'Paint'
* structures.
*
* @since:
* 2.11 -- **currently experimental only!** There might be changes
@ -498,10 +504,11 @@ FT_BEGIN_HEADER
FT_COLR_PAINTFORMAT_COLR_GLYPH = 11,
FT_COLR_PAINTFORMAT_TRANSFORM = 12,
FT_COLR_PAINTFORMAT_TRANSLATE = 14,
FT_COLR_PAINTFORMAT_ROTATE = 16,
FT_COLR_PAINTFORMAT_SKEW = 18,
FT_COLR_PAINTFORMAT_COMPOSITE = 20,
FT_COLR_PAINT_FORMAT_MAX = 21,
FT_COLR_PAINTFORMAT_SCALE = 16,
FT_COLR_PAINTFORMAT_ROTATE = 24,
FT_COLR_PAINTFORMAT_SKEW = 28,
FT_COLR_PAINTFORMAT_COMPOSITE = 32,
FT_COLR_PAINT_FORMAT_MAX = 33,
FT_COLR_PAINTFORMAT_UNSUPPORTED = 255
} FT_PaintFormat;
@ -1101,6 +1108,56 @@ FT_BEGIN_HEADER
} FT_PaintTranslate;
/**************************************************************************
*
* @struct:
* FT_PaintScale
*
* @description:
* A structure representing all of the 'COLR' v1 'PaintScale*' paint
* tables. Used for scaling downstream paints by a given x and y~scale,
* with a given center. This structure is used for all 'PaintScale*'
* types that are part of specification; fields of this structure are
* filled accordingly. If there is a center, the center values are set,
* otherwise they are set to the zero coordinate. If the source font
* file has 'PaintScaleUniform*' set, the scale values are set
* accordingly to the same value.
*
* @fields:
* paint ::
* An @FT_OpaquePaint object referencing the paint that is to be
* scaled.
*
* scale_x ::
* Scale factor in x~direction.
*
* scale_y ::
* Scale factor in y~direction.
*
* center_x ::
* x~coordinate of center point to scale from.
*
* center_y ::
* y~coordinate of center point to scale from.
*
* @since:
* 2.11 -- **currently experimental only!** There might be changes
* without retaining backward-compatibility of both the API and ABI.
*
*/
typedef struct FT_PaintScale_
{
FT_OpaquePaint paint;
FT_Fixed scale_x;
FT_Fixed scale_y;
FT_Fixed center_x;
FT_Fixed center_y;
} FT_PaintScale;
/**************************************************************************
*
* @struct:
@ -1277,6 +1334,7 @@ FT_BEGIN_HEADER
FT_PaintSweepGradient sweep_gradient;
FT_PaintTransform transform;
FT_PaintTranslate translate;
FT_PaintScale scale;
FT_PaintRotate rotate;
FT_PaintSkew skew;
FT_PaintComposite composite;

58
src/sfnt/ttcolr.c
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@ -49,6 +49,17 @@
#define COLR_HEADER_SIZE 14U
typedef enum FT_PaintFormat_Internal_
{
FT_COLR_PAINTFORMAT_INTERNAL_SCALE_CENTER = 18,
FT_COLR_PAINTFORMAT_INTERNAL_SCALE_UNIFORM = 20,
FT_COLR_PAINTFORMAT_INTERNAL_SCALE_UNIFORM_CENTER = 22,
FT_COLR_PAINTFORMAT_INTERNAL_ROTATE_CENTER = 26,
FT_COLR_PAINTFORMAT_INTERNAL_SKEW_CENTER = 30
} FT_PaintFormat_Internal;
typedef struct BaseGlyphRecord_
{
FT_UShort gid;
@ -561,6 +572,53 @@
return 1;
}
else if ( apaint->format ==
FT_COLR_PAINTFORMAT_SCALE ||
(FT_PaintFormat_Internal)apaint->format ==
FT_COLR_PAINTFORMAT_INTERNAL_SCALE_CENTER ||
(FT_PaintFormat_Internal)apaint->format ==
FT_COLR_PAINTFORMAT_INTERNAL_SCALE_UNIFORM ||
(FT_PaintFormat_Internal)apaint->format ==
FT_COLR_PAINTFORMAT_INTERNAL_SCALE_UNIFORM_CENTER )
{
apaint->u.scale.paint.p = child_table_p;
apaint->u.scale.paint.insert_root_transform = 0;
/* All scale paints get at least one scale value. */
apaint->u.scale.scale_x = FT_NEXT_LONG( p );
/* Non-uniform ones read an extra y value. */
if ( apaint->format ==
FT_COLR_PAINTFORMAT_SCALE ||
(FT_PaintFormat_Internal)apaint->format ==
FT_COLR_PAINTFORMAT_INTERNAL_SCALE_CENTER )
apaint->u.scale.scale_y = FT_NEXT_LONG( p );
else
apaint->u.scale.scale_y = apaint->u.scale.scale_x;
/* Scale paints that have a center read center coordinates, */
/* otherwise the center is (0,0). */
if ( (FT_PaintFormat_Internal)apaint->format ==
FT_COLR_PAINTFORMAT_INTERNAL_SCALE_CENTER ||
(FT_PaintFormat_Internal)apaint->format ==
FT_COLR_PAINTFORMAT_INTERNAL_SCALE_UNIFORM_CENTER )
{
apaint->u.scale.center_x = FT_NEXT_LONG ( p );
apaint->u.scale.center_y = FT_NEXT_LONG ( p );
}
else
{
apaint->u.scale.center_x = 0;
apaint->u.scale.center_y = 0;
}
/* FT 'COLR' v1 API output format always returns fully defined */
/* structs; we thus set the format to the public API value. */
apaint->format = FT_COLR_PAINTFORMAT_SCALE;
return 1;
}
else if ( apaint->format == FT_COLR_PAINTFORMAT_ROTATE )
{
apaint->u.rotate.paint.p = child_table_p;