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https://github.com/italicsjenga/vello.git
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0f91149b49
This patch adds radial gradients, including both the piet API and some new methods specifically to support COLRv1, including the ability to transform the gradient separately from the path.
42 lines
1.1 KiB
GLSL
42 lines
1.1 KiB
GLSL
// SPDX-License-Identifier: Apache-2.0 OR MIT OR Unlicense
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// Common data structures and functions for the draw tag stream.
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// Design of draw tag: & 0x1c gives scene size in bytes
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// & 1 gives clip
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// (tag >> 4) & 0x3c is info size in bytes
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#define Drawtag_Nop 0
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#define Drawtag_FillColor 0x44
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#define Drawtag_FillLinGradient 0x114
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#define Drawtag_FillRadGradient 0x2dc
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#define Drawtag_FillImage 0x48
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#define Drawtag_BeginClip 0x05
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#define Drawtag_EndClip 0x25
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struct DrawMonoid {
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uint path_ix;
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uint clip_ix;
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uint scene_offset;
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uint info_offset;
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};
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DrawMonoid draw_monoid_identity() {
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return DrawMonoid(0, 0, 0, 0);
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}
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DrawMonoid combine_draw_monoid(DrawMonoid a, DrawMonoid b) {
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DrawMonoid c;
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c.path_ix = a.path_ix + b.path_ix;
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c.clip_ix = a.clip_ix + b.clip_ix;
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c.scene_offset = a.scene_offset + b.scene_offset;
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c.info_offset = a.info_offset + b.info_offset;
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return c;
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}
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DrawMonoid map_tag(uint tag_word) {
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// TODO: at some point, EndClip should not generate a path
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uint has_path = uint(tag_word != Drawtag_Nop);
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return DrawMonoid(has_path, tag_word & 1, tag_word & 0x1c, (tag_word >> 4) & 0x3c);
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}
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