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more robust outline flipping

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This commit is contained in:
jrkb 2023-09-19 12:44:16 +02:00
parent dda49a89ea
commit 1890926805
1 changed files with 29 additions and 23 deletions
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52
src/gpufont/font.hpp
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@ -714,6 +714,7 @@ class Font {
//cout << "but charcode is r or n" << endl;
continue;
}
// if does exist already
if(glyphs.count(glyphIdentity) != 0){
continue;
}
@ -936,33 +937,38 @@ class Font {
convertContour(curves[i], directions[i], bbs[i], &face->glyph->outline, start, face->glyph->outline.contours[i], emSize);
start = face->glyph->outline.contours[i] + 1;
}
// outmost outline must be clock-wise
// then flip direction the deeper we go inside
for(int i = 0; i < n_contours; i++){
if(directions[i] < 0){
bool flip = true;
for(int j = 0; j < n_contours; j++){
if(i != j){
bool inside = bbs[j].xMin <= bbs[i].xMin
&& bbs[j].xMax >= bbs[i].xMax
&& bbs[j].yMin <= bbs[i].yMin
&& bbs[j].yMax >= bbs[i].yMax;
if(inside){
flip = false;
break;
}
int insideAnother = 0;
for(int j = 0; j < n_contours; j++){
if(i != j){
bool inside = bbs[j].xMin <= bbs[i].xMin
&& bbs[j].xMax >= bbs[i].xMax
&& bbs[j].yMin <= bbs[i].yMin
&& bbs[j].yMax >= bbs[i].yMax;
if(inside){
insideAnother++;
}
}
if(flip){
for(BufferCurve & curve : curves[i]){
float tmp_x = curve.x0;
float tmp_y = curve.y0;
curve.x0 = curve.x2;
curve.y0 = curve.y2;
curve.x2 = tmp_x;
curve.y2 = tmp_y;
}
std::reverse(curves[i].begin(), curves[i].end());
}
}
bool flip = false;
if((insideAnother % 2 == 0 && directions[i] < 0)
|| (insideAnother % 2 == 1 && directions[i] > 0)){
flip = true;
}
if(flip){
for(BufferCurve & curve : curves[i]){
float tmp_x = curve.x0;
float tmp_y = curve.y0;
curve.x0 = curve.x2;
curve.y0 = curve.y2;
curve.x2 = tmp_x;
curve.y2 = tmp_y;
}
std::reverse(curves[i].begin(), curves[i].end());
}
//}
bufferCurves.insert(bufferCurves.end(), curves[i].begin(), curves[i].end());
}
}else{