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text: Expose method for brute-force path stroke

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K. Lange 2021-10-04 20:31:30 +09:00
parent b87381116b
commit a281da4b82
1 changed files with 28 additions and 0 deletions
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28
lib/text.c
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@ -1011,3 +1011,31 @@ char * tt_get_name_string(struct TT_Font * font, int identifier) {
return NULL;
}
void tt_contour_stroke_bounded(gfx_context_t * ctx, struct TT_Contour * in, uint32_t color, float width,
int x_0, int y_0, int w, int h) {
/* This is a stupid slow thing */
for (int y = y_0; y < y_0 + h; y++) {
for (int x = x_0; x < x_0 + w; x++) {
struct gfx_point p = {(float)x + 0.5, (float)y + 0.5};
/* For every line in the contour... */
float mindist = 100.0;
for (size_t i = 0; i < in->edgeCount; ++i) {
struct gfx_point v = { in->edges[i].start.x, in->edges[i].start.y };
struct gfx_point w = { in->edges[i].end.x, in->edges[i].end.y };
float mine = gfx_line_distance(&p,&v,&w);
if (mine < mindist) mindist = mine;
}
if (mindist < width + 0.5) {
if (mindist < width - 0.5) {
GFX(ctx,x,y) = alpha_blend_rgba(GFX(ctx,x,y), color);
} else {
float alpha = 1.0 - (mindist - width + 0.5);
GFX(ctx,x,y) = alpha_blend_rgba(GFX(ctx,x,y), premultiply(rgba(_RED(color),_GRE(color),_BLU(color),(int)((double)_ALP(color) * alpha))));
}
}
}
}
}