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wg_engine: implement dash offset

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Introduced dash offset param for stroke dashes
Issue https://github.com/thorvg/thorvg/issues/2592
This commit is contained in:
Sergii Liebodkin 2024-10-31 20:17:16 +00:00 • committed by Hermet Park
parent 505ebe9fe6
commit 93ebd388c7
1 changed files with 16 additions and 2 deletions
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18
src/renderer/wg_engine/tvgWgGeometry.h
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@ -293,6 +293,21 @@ struct WgVertexBufferInd
// starting state
uint32_t index_dash = 0;
float len_total = dashPattern[index_dash];
// get dashes length
float dashes_lenth{};
for (uint32_t i = 0; i < dashCnt; i++)
dashes_lenth += dashPattern[i];
if (dashes_lenth == 0) return;
// normalize dash offset
float dashOffset = rstroke->dashOffset;
while(dashOffset < 0) dashOffset += dashes_lenth;
while(dashOffset > dashes_lenth) dashOffset -= dashes_lenth;
// scip dashes by offset
while(len_total < dashOffset) {
index_dash = (index_dash + 1) % dashCnt;
len_total += dashPattern[index_dash];
}
len_total -= dashOffset;
// iterate by polyline points
for (uint32_t i = 0; i < buff.vcount - 1; i++) {
// append current polyline point
@ -301,8 +316,7 @@ struct WgVertexBufferInd
// move inside polyline segment
while(len_total < buff.vdist[i+1]) {
// get current point
float t = len_total / buff.vdist[i+1];
dashed.append(buff.vbuff[i] + (buff.vbuff[i+1] - buff.vbuff[i]) * t);
dashed.append(tvg::lerp(buff.vbuff[i], buff.vbuff[i+1], len_total / buff.vdist[i+1]));
// update current state
index_dash = (index_dash + 1) % dashCnt;
len_total += dashPattern[index_dash];