[sfnt] Add API to get actual paint from `FT_OpaquePaint` (#59703).
* src/sfnt/ttcolr.c (tt_face_get_paint): New function to resolve an `FT_OpaquePaint` paint reference into an `FT_COLR_Paint` object of a certain format, which contains the detailed information stored in a paint of the respective format. (read_paint): New function to provide the format specific parsing and to populate the data members of each specific `FT_COLR_Paint` subtype. (read_color_line): New function to parse retrieved color line information into an `FT_ColorLine` object, which has information about the color line extend mode as well as an `FT_ColorStopIterator` object. * src/sfnt/ttcolr.h: Updated.
This commit is contained in:
Dominik Röttsches
Werner Lemberg
parent
9e422b67c8
commit
cdad4db424
18
ChangeLog
18
ChangeLog
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@ -1,3 +1,21 @@
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2020-12-16 Dominik Röttsches <drott@chromium.org>
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[sfnt] Add API to get actual paint from `FT_OpaquePaint` (#59703).
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* src/sfnt/ttcolr.c (tt_face_get_paint): New function to resolve an
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`FT_OpaquePaint` paint reference into an `FT_COLR_Paint` object of a
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certain format, which contains the detailed information stored in a
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paint of the respective format.
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(read_paint): New function to provide the format specific parsing
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and to populate the data members of each specific `FT_COLR_Paint`
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subtype.
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(read_color_line): New function to parse retrieved color line
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information into an `FT_ColorLine` object, which has information
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about the color line extend mode as well as an
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`FT_ColorStopIterator` object.
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* src/sfnt/ttcolr.h: Updated.
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2020-12-16 Dominik Röttsches <drott@chromium.org>
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[sfnt] Add API to retrieve 'COLR' v1 root paint (#59703).
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@ -319,6 +319,301 @@
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}
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static FT_Bool
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read_color_line( FT_Byte* paint_base,
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FT_ULong colorline_offset,
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FT_ColorLine *colorline )
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{
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FT_Byte* p = (FT_Byte *)( paint_base + colorline_offset );
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FT_PaintExtend paint_extend;
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/* TODO: Check pointer limits. */
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paint_extend = FT_NEXT_BYTE( p );
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if ( paint_extend > FT_COLR_PAINT_EXTEND_REFLECT )
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return 0;
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colorline->extend = paint_extend;
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colorline->color_stop_iterator.num_color_stops = FT_NEXT_USHORT( p );
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colorline->color_stop_iterator.p = p;
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colorline->color_stop_iterator.current_color_stop = 0;
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return 1;
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}
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static FT_Bool
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read_paint( Colr* colr,
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FT_Byte* p,
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FT_COLR_Paint* apaint )
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{
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FT_Byte* paint_base = p;
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apaint->format = FT_NEXT_BYTE( p );
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if ( apaint->format >= FT_COLR_PAINT_FORMAT_MAX )
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return 0;
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if ( apaint->format == FT_COLR_PAINTFORMAT_COLR_LAYERS )
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{
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/* Initialize layer iterator/ */
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FT_Byte num_layers;
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FT_UInt32 first_layer_index;
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num_layers = FT_NEXT_BYTE( p );
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if ( num_layers > colr->num_layers_v1 )
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return 0;
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first_layer_index = FT_NEXT_ULONG( p );
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if ( first_layer_index + num_layers > colr->num_layers_v1 )
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return 0;
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apaint->u.colr_layers.layer_iterator.num_layers = num_layers;
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apaint->u.colr_layers.layer_iterator.layer = 0;
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/* TODO: Check whether pointer is outside colr? */
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apaint->u.colr_layers.layer_iterator.p =
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colr->layers_v1 +
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LAYER_V1_LIST_NUM_LAYERS_SIZE +
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LAYER_V1_LIST_PAINT_OFFSET_SIZE * first_layer_index;
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return 1;
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}
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if ( apaint->format == FT_COLR_PAINTFORMAT_GLYPH )
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{
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FT_UInt32 paint_offset;
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FT_Byte* paint_p;
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paint_offset = FT_NEXT_UOFF3( p );
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if ( !paint_offset )
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return 0;
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paint_p = (FT_Byte*)( paint_base + paint_offset );
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if ( paint_p > ( (FT_Byte*)colr->table + colr->table_size ) )
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return 0;
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apaint->u.glyph.paint.p = paint_p;
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apaint->u.glyph.glyphID = FT_NEXT_USHORT( p );
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}
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else if ( apaint->format == FT_COLR_PAINTFORMAT_SOLID )
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{
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apaint->u.solid.color.palette_index = FT_NEXT_USHORT ( p );
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apaint->u.solid.color.alpha = FT_NEXT_USHORT ( p );
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/* skip VarIdx */
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FT_NEXT_ULONG ( p );
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}
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else if ( apaint->format == FT_COLR_PAINTFORMAT_LINEAR_GRADIENT )
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{
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FT_ULong color_line_offset = FT_NEXT_OFF3( p );
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if ( !read_color_line( paint_base,
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color_line_offset,
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&apaint->u.linear_gradient.colorline ) )
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return 0;
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/* skip VarIdx entries */
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apaint->u.linear_gradient.p0.x = FT_NEXT_SHORT ( p );
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FT_NEXT_ULONG ( p );
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apaint->u.linear_gradient.p0.y = FT_NEXT_SHORT ( p );
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FT_NEXT_ULONG ( p );
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apaint->u.linear_gradient.p1.x = FT_NEXT_SHORT ( p );
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FT_NEXT_ULONG ( p );
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apaint->u.linear_gradient.p1.y = FT_NEXT_SHORT ( p );
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FT_NEXT_ULONG ( p );
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apaint->u.linear_gradient.p2.x = FT_NEXT_SHORT ( p );
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FT_NEXT_ULONG ( p );
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apaint->u.linear_gradient.p2.y = FT_NEXT_SHORT ( p );
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FT_NEXT_ULONG ( p );
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}
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else if ( apaint->format == FT_COLR_PAINTFORMAT_RADIAL_GRADIENT )
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{
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FT_ULong color_line_offset = color_line_offset = FT_NEXT_OFF3( p );
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if ( !read_color_line( paint_base,
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color_line_offset,
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&apaint->u.linear_gradient.colorline ) )
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return 0;
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/* skip VarIdx entries */
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apaint->u.radial_gradient.c0.x = FT_NEXT_SHORT ( p );
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FT_NEXT_ULONG ( p );
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apaint->u.radial_gradient.c0.y = FT_NEXT_SHORT ( p );
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FT_NEXT_ULONG ( p );
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apaint->u.radial_gradient.r0 = FT_NEXT_USHORT ( p );
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FT_NEXT_ULONG ( p );
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apaint->u.radial_gradient.c1.x = FT_NEXT_SHORT ( p );
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FT_NEXT_ULONG ( p );
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apaint->u.radial_gradient.c1.y = FT_NEXT_SHORT ( p );
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FT_NEXT_ULONG ( p );
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apaint->u.radial_gradient.r1 = FT_NEXT_USHORT ( p );
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FT_NEXT_ULONG ( p );
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}
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else if ( apaint->format == FT_COLR_PAINTFORMAT_TRANSFORMED )
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{
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FT_UInt32 paint_offset;
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FT_Byte* paint_p;
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paint_offset = FT_NEXT_UOFF3( p );
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if ( !paint_offset )
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return 0;
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paint_p = (FT_Byte*)( paint_base + paint_offset );
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if ( paint_p > ( (FT_Byte*)colr->table + colr->table_size ) )
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return 0;
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apaint->u.transformed.paint.p = paint_p;
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/* skip VarIdx entries */
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apaint->u.transformed.affine.xx = FT_NEXT_LONG( p );
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FT_NEXT_ULONG( p );
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apaint->u.transformed.affine.yx = FT_NEXT_LONG( p );
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FT_NEXT_ULONG( p );
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apaint->u.transformed.affine.xy = FT_NEXT_LONG( p );
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FT_NEXT_ULONG( p );
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apaint->u.transformed.affine.yy = FT_NEXT_LONG( p );
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FT_NEXT_ULONG( p );
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apaint->u.transformed.affine.dx = FT_NEXT_LONG( p );
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FT_NEXT_ULONG( p );
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apaint->u.transformed.affine.dy = FT_NEXT_LONG( p );
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FT_NEXT_ULONG( p );
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}
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else if ( apaint->format == FT_COLR_PAINTFORMAT_TRANSLATE )
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{
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FT_UInt32 paint_offset;
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FT_Byte* paint_p;
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paint_offset = FT_NEXT_UOFF3( p );
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if ( !paint_offset )
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return 0;
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paint_p = (FT_Byte*)( paint_base + paint_offset );
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if ( paint_p > ( (FT_Byte*)colr->table + colr->table_size ) )
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return 0;
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apaint->u.translate.paint.p = paint_p;
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/* skip VarIdx entries */
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apaint->u.translate.dx = FT_NEXT_LONG( p );
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FT_NEXT_ULONG( p );
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apaint->u.translate.dy = FT_NEXT_LONG( p );
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FT_NEXT_ULONG( p );
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}
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else if ( apaint->format == FT_COLR_PAINTFORMAT_ROTATE )
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{
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FT_UInt32 paint_offset;
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FT_Byte* paint_p;
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paint_offset = FT_NEXT_UOFF3( p );
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if ( !paint_offset )
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return 0;
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paint_p = (FT_Byte*)( paint_base + paint_offset );
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if ( paint_p > ( (FT_Byte*)colr->table + colr->table_size ) )
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return 0;
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apaint->u.rotate.paint.p = paint_p;
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/* skip VarIdx entries */
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apaint->u.rotate.angle = FT_NEXT_LONG( p );
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FT_NEXT_ULONG( p );
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apaint->u.rotate.center_x = FT_NEXT_LONG( p );
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FT_NEXT_ULONG( p );
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apaint->u.rotate.center_y = FT_NEXT_LONG( p );
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FT_NEXT_ULONG( p );
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}
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else if ( apaint->format == FT_COLR_PAINTFORMAT_SKEW )
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{
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FT_UInt32 paint_offset;
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FT_Byte* paint_p;
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paint_offset = FT_NEXT_UOFF3( p );
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if ( !paint_offset )
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return 0;
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paint_p = (FT_Byte*)( paint_base + paint_offset );
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if ( paint_p > ( (FT_Byte*)colr->table + colr->table_size ) )
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return 0;
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apaint->u.skew.paint.p = paint_p;
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/* skip VarIdx entries */
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apaint->u.skew.x_skew_angle = FT_NEXT_LONG( p );
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FT_NEXT_ULONG( p );
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apaint->u.skew.y_skew_angle = FT_NEXT_LONG( p );
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FT_NEXT_ULONG( p );
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apaint->u.skew.center_x = FT_NEXT_LONG( p );
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FT_NEXT_ULONG( p );
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apaint->u.skew.center_y = FT_NEXT_LONG( p );
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FT_NEXT_ULONG( p );
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}
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else if ( apaint->format == FT_COLR_PAINTFORMAT_COMPOSITE )
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{
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FT_UInt32 source_paint_offset;
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FT_Byte* source_paint_p;
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FT_UInt32 backdrop_paint_offset;
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FT_Byte* backdrop_paint_p;
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FT_UInt composite_mode;
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source_paint_offset = FT_NEXT_UOFF3( p );
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if ( !source_paint_offset )
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return 0;
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source_paint_p = (FT_Byte*)( paint_base + source_paint_offset );
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if ( source_paint_p > ( (FT_Byte*)colr->table + colr->table_size ) )
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return 0;
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apaint->u.composite.source_paint.p = source_paint_p;
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composite_mode = FT_NEXT_BYTE( p );
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if ( composite_mode >= FT_COLR_COMPOSITE_MAX )
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return 0;
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apaint->u.composite.composite_mode = composite_mode;
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backdrop_paint_offset = FT_NEXT_UOFF3( p );
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if ( !backdrop_paint_offset )
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return 0;
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backdrop_paint_p = (FT_Byte*)( paint_base + backdrop_paint_offset );
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if ( backdrop_paint_p > ( (FT_Byte*)colr->table + colr->table_size ) )
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return 0;
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apaint->u.composite.backdrop_paint.p = backdrop_paint_p;
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}
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else if ( apaint->format == FT_COLR_PAINTFORMAT_COLR_GLYPH )
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apaint->u.colr_glyph.glyphID = FT_NEXT_USHORT( p );
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return 1;
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}
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static FT_Bool
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find_base_glyph_v1_record ( FT_Byte * base_glyph_begin,
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FT_Int num_base_glyph,
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@ -398,6 +693,26 @@
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}
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FT_LOCAL_DEF( FT_Bool )
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tt_face_get_paint( TT_Face face,
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FT_OpaquePaint opaque_paint,
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FT_COLR_Paint* paint )
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{
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Colr* colr = (Colr*)face->colr;
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FT_Byte* p;
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if ( opaque_paint.p < (FT_Byte*)colr->table ||
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opaque_paint.p >= ( (FT_Byte*)colr->table + colr->table_size ) )
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return 0;
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p = opaque_paint.p;
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return read_paint( colr, p, paint );
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}
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FT_LOCAL_DEF( FT_Error )
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tt_face_colr_blend_layer( TT_Face face,
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FT_UInt color_index,
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@ -47,6 +47,11 @@ FT_BEGIN_HEADER
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FT_UInt base_glyph,
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FT_OpaquePaint* paint );
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FT_LOCAL( FT_Bool )
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tt_face_get_paint( TT_Face face,
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FT_OpaquePaint opaque_paint,
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FT_COLR_Paint* paint );
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FT_LOCAL( FT_Error )
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tt_face_colr_blend_layer( TT_Face face,
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FT_UInt color_index,
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