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[sfnt] Add 'COLR' v1 API to retrieve color layers (#59703).

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* src/sfnt/ttcolr.c (tt_face_get_paint_layers): New function to get
the layers of a `PaintColrLayers` table in the font, using an
`FT_LayerIterator` from an `FT_PaintColrLayers` object retrieved via
`tt_face_get_paint`.

* src/sfnt/ttcolr.h: Updated.
This commit is contained in:
Dominik Röttsches 2020-12-16 17:06:42 +02:00 committed by Werner Lemberg
parent be06a9d002
commit 6260b4901c
3 changed files with 68 additions and 0 deletions
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11
ChangeLog
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@ -1,3 +1,14 @@
2020-12-16 Dominik Röttsches <drott@chromium.org>
[sfnt] Add 'COLR' v1 API to retrieve color layers (#59703).
* src/sfnt/ttcolr.c (tt_face_get_paint_layers): New function to get
the layers of a `PaintColrLayers` table in the font, using an
`FT_LayerIterator` from an `FT_PaintColrLayers` object retrieved via
`tt_face_get_paint`.
* src/sfnt/ttcolr.h: Updated.
2020-12-16 Dominik Röttsches <drott@chromium.org>
[sfnt] Add 'COLR' v1 API to iterate color stops (#59703).

52
src/sfnt/ttcolr.c
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@ -693,6 +693,58 @@
}
FT_LOCAL_DEF( FT_Bool )
tt_face_get_paint_layers( TT_Face face,
FT_LayerIterator* iterator,
FT_OpaquePaint* opaque_paint )
{
FT_Byte* p = NULL;
FT_Byte* p_first_layer = NULL;
FT_UInt32 paint_offset;
Colr* colr;
if ( iterator->layer == iterator->num_layers )
return 0;
colr = (Colr*)face->colr;
if ( !colr )
return 0;
/*
* We have an iterator pointing at a paint offset as part of the
* `paintOffset` array in `LayerV1List`.
*/
p = iterator->p;
/*
* Do a cursor sanity check of the iterator. Counting backwards from
* where it stands, we need to end up at a position after the beginning
* of the `LayerV1List` table and not after the end of the
* `LayerV1List`.
*/
p_first_layer = p -
iterator->layer * LAYER_V1_LIST_PAINT_OFFSET_SIZE -
LAYER_V1_LIST_NUM_LAYERS_SIZE;
if ( p_first_layer < (FT_Byte*)colr->layers_v1 )
return 0;
if ( p_first_layer >= (FT_Byte*)(
colr->layers_v1 + LAYER_V1_LIST_NUM_LAYERS_SIZE +
colr->num_layers_v1 * LAYER_V1_LIST_PAINT_OFFSET_SIZE ) )
return 0;
paint_offset = FT_NEXT_ULONG( p );
opaque_paint->p = (FT_Byte*)( colr->layers_v1 + paint_offset );
iterator->p = p;
iterator->layer++;
return 1;
}
FT_LOCAL_DEF ( FT_Bool )
tt_face_get_colorline_stops( TT_Face face,
FT_ColorStop* color_stop,

5
src/sfnt/ttcolr.h
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@ -47,6 +47,11 @@ FT_BEGIN_HEADER
FT_UInt base_glyph,
FT_OpaquePaint* paint );
FT_LOCAL ( FT_Bool )
tt_face_get_paint_layers( TT_Face face,
FT_LayerIterator* iterator,
FT_OpaquePaint* paint );
FT_LOCAL( FT_Bool )
tt_face_get_colorline_stops( TT_Face face,
FT_ColorStop* color_stop,