Commit cdad4db4240044512a33cf480f28b093ae3a85c9
2020-12-16T16:52:24
[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.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377
diff --git a/ChangeLog b/ChangeLog
index c4c3b3a..a33c1e2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,23 @@
2020-12-16 Dominik Röttsches <drott@chromium.org>
+ [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.
+
+2020-12-16 Dominik Röttsches <drott@chromium.org>
+
[sfnt] Add API to retrieve 'COLR' v1 root paint (#59703).
* src/sfnt/ttcolr.c (BaseGlyphV1Record): New structure.
diff --git a/src/sfnt/ttcolr.c b/src/sfnt/ttcolr.c
index 9b05b3a..0d2b866 100644
--- a/src/sfnt/ttcolr.c
+++ b/src/sfnt/ttcolr.c
@@ -320,6 +320,301 @@
static FT_Bool
+ read_color_line( FT_Byte* paint_base,
+ FT_ULong colorline_offset,
+ FT_ColorLine *colorline )
+ {
+ FT_Byte* p = (FT_Byte *)( paint_base + colorline_offset );
+ FT_PaintExtend paint_extend;
+ /* TODO: Check pointer limits. */
+
+
+ paint_extend = FT_NEXT_BYTE( p );
+ if ( paint_extend > FT_COLR_PAINT_EXTEND_REFLECT )
+ return 0;
+
+ colorline->extend = paint_extend;
+
+ colorline->color_stop_iterator.num_color_stops = FT_NEXT_USHORT( p );
+ colorline->color_stop_iterator.p = p;
+ colorline->color_stop_iterator.current_color_stop = 0;
+
+ return 1;
+ }
+
+
+ static FT_Bool
+ read_paint( Colr* colr,
+ FT_Byte* p,
+ FT_COLR_Paint* apaint )
+ {
+ FT_Byte* paint_base = p;
+
+
+ apaint->format = FT_NEXT_BYTE( p );
+
+ if ( apaint->format >= FT_COLR_PAINT_FORMAT_MAX )
+ return 0;
+
+ if ( apaint->format == FT_COLR_PAINTFORMAT_COLR_LAYERS )
+ {
+ /* Initialize layer iterator/ */
+ FT_Byte num_layers;
+ FT_UInt32 first_layer_index;
+
+
+ num_layers = FT_NEXT_BYTE( p );
+ if ( num_layers > colr->num_layers_v1 )
+ return 0;
+
+ first_layer_index = FT_NEXT_ULONG( p );
+ if ( first_layer_index + num_layers > colr->num_layers_v1 )
+ return 0;
+
+ apaint->u.colr_layers.layer_iterator.num_layers = num_layers;
+ apaint->u.colr_layers.layer_iterator.layer = 0;
+ /* TODO: Check whether pointer is outside colr? */
+ apaint->u.colr_layers.layer_iterator.p =
+ colr->layers_v1 +
+ LAYER_V1_LIST_NUM_LAYERS_SIZE +
+ LAYER_V1_LIST_PAINT_OFFSET_SIZE * first_layer_index;
+
+ return 1;
+ }
+
+ if ( apaint->format == FT_COLR_PAINTFORMAT_GLYPH )
+ {
+ FT_UInt32 paint_offset;
+ FT_Byte* paint_p;
+
+
+ paint_offset = FT_NEXT_UOFF3( p );
+ if ( !paint_offset )
+ return 0;
+
+ paint_p = (FT_Byte*)( paint_base + paint_offset );
+ if ( paint_p > ( (FT_Byte*)colr->table + colr->table_size ) )
+ return 0;
+
+ apaint->u.glyph.paint.p = paint_p;
+ apaint->u.glyph.glyphID = FT_NEXT_USHORT( p );
+ }
+
+ else if ( apaint->format == FT_COLR_PAINTFORMAT_SOLID )
+ {
+ apaint->u.solid.color.palette_index = FT_NEXT_USHORT ( p );
+ apaint->u.solid.color.alpha = FT_NEXT_USHORT ( p );
+ /* skip VarIdx */
+ FT_NEXT_ULONG ( p );
+ }
+
+ else if ( apaint->format == FT_COLR_PAINTFORMAT_LINEAR_GRADIENT )
+ {
+ FT_ULong color_line_offset = FT_NEXT_OFF3( p );
+
+
+ if ( !read_color_line( paint_base,
+ color_line_offset,
+ &apaint->u.linear_gradient.colorline ) )
+ return 0;
+
+ /* skip VarIdx entries */
+ apaint->u.linear_gradient.p0.x = FT_NEXT_SHORT ( p );
+ FT_NEXT_ULONG ( p );
+ apaint->u.linear_gradient.p0.y = FT_NEXT_SHORT ( p );
+ FT_NEXT_ULONG ( p );
+ apaint->u.linear_gradient.p1.x = FT_NEXT_SHORT ( p );
+ FT_NEXT_ULONG ( p );
+ apaint->u.linear_gradient.p1.y = FT_NEXT_SHORT ( p );
+ FT_NEXT_ULONG ( p );
+ apaint->u.linear_gradient.p2.x = FT_NEXT_SHORT ( p );
+ FT_NEXT_ULONG ( p );
+ apaint->u.linear_gradient.p2.y = FT_NEXT_SHORT ( p );
+ FT_NEXT_ULONG ( p );
+ }
+
+ else if ( apaint->format == FT_COLR_PAINTFORMAT_RADIAL_GRADIENT )
+ {
+ FT_ULong color_line_offset = color_line_offset = FT_NEXT_OFF3( p );
+
+
+ if ( !read_color_line( paint_base,
+ color_line_offset,
+ &apaint->u.linear_gradient.colorline ) )
+ return 0;
+
+ /* skip VarIdx entries */
+ apaint->u.radial_gradient.c0.x = FT_NEXT_SHORT ( p );
+ FT_NEXT_ULONG ( p );
+ apaint->u.radial_gradient.c0.y = FT_NEXT_SHORT ( p );
+ FT_NEXT_ULONG ( p );
+
+ apaint->u.radial_gradient.r0 = FT_NEXT_USHORT ( p );
+ FT_NEXT_ULONG ( p );
+
+ apaint->u.radial_gradient.c1.x = FT_NEXT_SHORT ( p );
+ FT_NEXT_ULONG ( p );
+ apaint->u.radial_gradient.c1.y = FT_NEXT_SHORT ( p );
+ FT_NEXT_ULONG ( p );
+
+ apaint->u.radial_gradient.r1 = FT_NEXT_USHORT ( p );
+ FT_NEXT_ULONG ( p );
+ }
+
+ else if ( apaint->format == FT_COLR_PAINTFORMAT_TRANSFORMED )
+ {
+ FT_UInt32 paint_offset;
+ FT_Byte* paint_p;
+
+
+ paint_offset = FT_NEXT_UOFF3( p );
+ if ( !paint_offset )
+ return 0;
+
+ paint_p = (FT_Byte*)( paint_base + paint_offset );
+ if ( paint_p > ( (FT_Byte*)colr->table + colr->table_size ) )
+ return 0;
+
+ apaint->u.transformed.paint.p = paint_p;
+
+ /* skip VarIdx entries */
+ apaint->u.transformed.affine.xx = FT_NEXT_LONG( p );
+ FT_NEXT_ULONG( p );
+ apaint->u.transformed.affine.yx = FT_NEXT_LONG( p );
+ FT_NEXT_ULONG( p );
+ apaint->u.transformed.affine.xy = FT_NEXT_LONG( p );
+ FT_NEXT_ULONG( p );
+ apaint->u.transformed.affine.yy = FT_NEXT_LONG( p );
+ FT_NEXT_ULONG( p );
+ apaint->u.transformed.affine.dx = FT_NEXT_LONG( p );
+ FT_NEXT_ULONG( p );
+ apaint->u.transformed.affine.dy = FT_NEXT_LONG( p );
+ FT_NEXT_ULONG( p );
+ }
+
+ else if ( apaint->format == FT_COLR_PAINTFORMAT_TRANSLATE )
+ {
+ FT_UInt32 paint_offset;
+ FT_Byte* paint_p;
+
+
+ paint_offset = FT_NEXT_UOFF3( p );
+ if ( !paint_offset )
+ return 0;
+
+ paint_p = (FT_Byte*)( paint_base + paint_offset );
+ if ( paint_p > ( (FT_Byte*)colr->table + colr->table_size ) )
+ return 0;
+
+ apaint->u.translate.paint.p = paint_p;
+
+ /* skip VarIdx entries */
+ apaint->u.translate.dx = FT_NEXT_LONG( p );
+ FT_NEXT_ULONG( p );
+ apaint->u.translate.dy = FT_NEXT_LONG( p );
+ FT_NEXT_ULONG( p );
+ }
+
+ else if ( apaint->format == FT_COLR_PAINTFORMAT_ROTATE )
+ {
+ FT_UInt32 paint_offset;
+ FT_Byte* paint_p;
+
+
+ paint_offset = FT_NEXT_UOFF3( p );
+ if ( !paint_offset )
+ return 0;
+
+ paint_p = (FT_Byte*)( paint_base + paint_offset );
+ if ( paint_p > ( (FT_Byte*)colr->table + colr->table_size ) )
+ return 0;
+
+ apaint->u.rotate.paint.p = paint_p;
+
+ /* skip VarIdx entries */
+ apaint->u.rotate.angle = FT_NEXT_LONG( p );
+ FT_NEXT_ULONG( p );
+
+ apaint->u.rotate.center_x = FT_NEXT_LONG( p );
+ FT_NEXT_ULONG( p );
+ apaint->u.rotate.center_y = FT_NEXT_LONG( p );
+ FT_NEXT_ULONG( p );
+ }
+
+ else if ( apaint->format == FT_COLR_PAINTFORMAT_SKEW )
+ {
+ FT_UInt32 paint_offset;
+ FT_Byte* paint_p;
+
+
+ paint_offset = FT_NEXT_UOFF3( p );
+ if ( !paint_offset )
+ return 0;
+
+ paint_p = (FT_Byte*)( paint_base + paint_offset );
+ if ( paint_p > ( (FT_Byte*)colr->table + colr->table_size ) )
+ return 0;
+
+ apaint->u.skew.paint.p = paint_p;
+
+ /* skip VarIdx entries */
+ apaint->u.skew.x_skew_angle = FT_NEXT_LONG( p );
+ FT_NEXT_ULONG( p );
+ apaint->u.skew.y_skew_angle = FT_NEXT_LONG( p );
+ FT_NEXT_ULONG( p );
+
+ apaint->u.skew.center_x = FT_NEXT_LONG( p );
+ FT_NEXT_ULONG( p );
+ apaint->u.skew.center_y = FT_NEXT_LONG( p );
+ FT_NEXT_ULONG( p );
+ }
+
+ else if ( apaint->format == FT_COLR_PAINTFORMAT_COMPOSITE )
+ {
+ FT_UInt32 source_paint_offset;
+ FT_Byte* source_paint_p;
+
+ FT_UInt32 backdrop_paint_offset;
+ FT_Byte* backdrop_paint_p;
+
+ FT_UInt composite_mode;
+
+
+ source_paint_offset = FT_NEXT_UOFF3( p );
+ if ( !source_paint_offset )
+ return 0;
+
+ source_paint_p = (FT_Byte*)( paint_base + source_paint_offset );
+ if ( source_paint_p > ( (FT_Byte*)colr->table + colr->table_size ) )
+ return 0;
+
+ apaint->u.composite.source_paint.p = source_paint_p;
+
+ composite_mode = FT_NEXT_BYTE( p );
+ if ( composite_mode >= FT_COLR_COMPOSITE_MAX )
+ return 0;
+
+ apaint->u.composite.composite_mode = composite_mode;
+
+ backdrop_paint_offset = FT_NEXT_UOFF3( p );
+ if ( !backdrop_paint_offset )
+ return 0;
+
+ backdrop_paint_p = (FT_Byte*)( paint_base + backdrop_paint_offset );
+ if ( backdrop_paint_p > ( (FT_Byte*)colr->table + colr->table_size ) )
+ return 0;
+
+ apaint->u.composite.backdrop_paint.p = backdrop_paint_p;
+ }
+
+ else if ( apaint->format == FT_COLR_PAINTFORMAT_COLR_GLYPH )
+ apaint->u.colr_glyph.glyphID = FT_NEXT_USHORT( p );
+
+ return 1;
+ }
+
+
+ static FT_Bool
find_base_glyph_v1_record ( FT_Byte * base_glyph_begin,
FT_Int num_base_glyph,
FT_UInt glyph_id,
@@ -398,6 +693,26 @@
}
+ FT_LOCAL_DEF( FT_Bool )
+ tt_face_get_paint( TT_Face face,
+ FT_OpaquePaint opaque_paint,
+ FT_COLR_Paint* paint )
+ {
+ Colr* colr = (Colr*)face->colr;
+
+ FT_Byte* p;
+
+
+ if ( opaque_paint.p < (FT_Byte*)colr->table ||
+ opaque_paint.p >= ( (FT_Byte*)colr->table + colr->table_size ) )
+ return 0;
+
+ p = opaque_paint.p;
+
+ return read_paint( colr, p, paint );
+ }
+
+
FT_LOCAL_DEF( FT_Error )
tt_face_colr_blend_layer( TT_Face face,
FT_UInt color_index,
diff --git a/src/sfnt/ttcolr.h b/src/sfnt/ttcolr.h
index 6cce50f..cdae3fa 100644
--- a/src/sfnt/ttcolr.h
+++ b/src/sfnt/ttcolr.h
@@ -47,6 +47,11 @@ FT_BEGIN_HEADER
FT_UInt base_glyph,
FT_OpaquePaint* paint );
+ FT_LOCAL( FT_Bool )
+ tt_face_get_paint( TT_Face face,
+ FT_OpaquePaint opaque_paint,
+ FT_COLR_Paint* paint );
+
FT_LOCAL( FT_Error )
tt_face_colr_blend_layer( TT_Face face,
FT_UInt color_index,