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try to impl rect multicolor command with cairo

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This commit is contained in:
Richard Gill 2021-05-01 20:50:31 +02:00
parent 1ae558aa7f
commit 596e5d76d9
1 changed files with 27 additions and 3 deletions
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30
demo/xcb_cairo/nuklear_xcb.h
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@ -637,9 +637,33 @@ NK_API int nk_cairo_render(struct nk_cairo_context *cairo_ctx, struct nk_context
break;
case NK_COMMAND_RECT_MULTI_COLOR:
{
/* const struct nk_command_rect_multi_color *r =
(const struct nk_command_rect_multi_color *) cmd; */
/* TODO */
struct nk_color c0, c1;
const struct nk_command_rect_multi_color *r = (const struct nk_command_rect_multi_color *)cmd;
nk_uint lc = nk_color_u32(r->left), tc = nk_color_u32(r->top), rc = nk_color_u32(r->right);
cairo_pattern_t *pat;
double x0, x1, y0, y1;
/* for now, only accept 2 colors gradients, so either left=right (vertical gradient) or left!=right (horizontal gradient) */
if (nk_color_u32(r->left) == nk_color_u32(r->right)) {
x0 = x1 = 0.0;
y0 = 1.0;
y1 = 0.0;
c0 = r->top;
c1 = r->bottom;
}
else {
y0 = y1 = 0.0;
x0 = 0.0;
x1 = 1.0;
c0 = r->left;
c1 = r->right;
}
pat = cairo_pattern_create_linear(x0, y0, x1, y1);
cairo_pattern_add_color_stop_rgba(pat, 0, NK_TO_CAIRO(c0.r), NK_TO_CAIRO(c0.g), NK_TO_CAIRO(c0.b), NK_TO_CAIRO(c0.a));
cairo_pattern_add_color_stop_rgba(pat, 1, NK_TO_CAIRO(c1.r), NK_TO_CAIRO(c1.g), NK_TO_CAIRO(c1.b), NK_TO_CAIRO(c1.a));
cairo_rectangle(cr, r->x, r->y, r->w, r->h);
cairo_set_source(cr, pat);
cairo_fill(cr);
cairo_pattern_destroy(pat);
}
break;
case NK_COMMAND_CIRCLE: