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Implement dashed and dotted underlines

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This is implementing new support in Pango for
rendering dashed and dotted lines. This is currently
using a linear gradient for dashes and a repeat node
for dots.
This commit is contained in:
Matthias Clasen
2021-03-30 23:59:38 -04:00
parent 3973a14c07
commit e74e7766d1
1 changed files with 82 additions and 0 deletions
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82
gtk/gskpango.c
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@@ -127,6 +127,85 @@ gsk_pango_renderer_draw_rectangle (PangoRenderer *renderer,
(double)height / PANGO_SCALE));
}
#if PANGO_VERSION_CHECK(1,49,0)
static void
gsk_pango_renderer_draw_line (PangoRenderer *renderer,
PangoRenderPart part,
PangoRenderLineStyle style,
int x,
int y,
int width,
int height)
{
GskPangoRenderer *crenderer = (GskPangoRenderer *) (renderer);
GdkRGBA rgba;
double xx, yy, ww, hh;
xx = (double)x / PANGO_SCALE;
yy = (double)y / PANGO_SCALE;
ww = (double)width / PANGO_SCALE;
hh = (double)height / PANGO_SCALE;
get_color (crenderer, part, &rgba);
switch (style)
{
case PANGO_RENDER_LINE_SOLID:
gtk_snapshot_append_color (crenderer->snapshot,
&rgba,
&GRAPHENE_RECT_INIT (xx, yy, ww, hh));
break;
case PANGO_RENDER_LINE_DOTTED:
{
GskRoundedRect dot;
double d = MIN (ww, hh);
graphene_rect_t bounds = GRAPHENE_RECT_INIT (xx, yy, d, d);
graphene_size_t rr = GRAPHENE_SIZE_INIT (d/2, d/2);
GdkRGBA transparent = { 0.f, 0.f, 0.f, 0.f };
gsk_rounded_rect_init (&dot, &bounds, &rr, &rr, &rr, &rr);
gtk_snapshot_push_repeat (crenderer->snapshot,
&GRAPHENE_RECT_INIT (xx, yy, ww, hh),
NULL);
gtk_snapshot_push_rounded_clip (crenderer->snapshot, &dot);
gtk_snapshot_append_color (crenderer->snapshot, &rgba, &bounds);
gtk_snapshot_pop (crenderer->snapshot);
gtk_snapshot_append_color (crenderer->snapshot, &transparent, &GRAPHENE_RECT_INIT (xx + d, yy, 0.5 * d, d));
gtk_snapshot_pop (crenderer->snapshot);
}
break;
case PANGO_RENDER_LINE_DASHED:
{
GskColorStop stops[4];
GdkRGBA transparent = { 0.f, 0.f, 0.f, 0.f };
stops[0].offset = 0;
stops[0].color = rgba;
stops[1].offset = 0.66;
stops[1].color = rgba;
stops[2].offset = 0.66;
stops[2].color = transparent;
stops[3].offset = 1;
stops[3].color = transparent;
gtk_snapshot_append_repeating_linear_gradient (
crenderer->snapshot,
&GRAPHENE_RECT_INIT (xx, yy, ww, hh),
&GRAPHENE_POINT_INIT (xx, yy),
&GRAPHENE_POINT_INIT (xx + 9 * MIN (ww, hh), yy),
stops, 4);
}
break;
default:
g_assert_not_reached ();
}
}
#endif
static void
gsk_pango_renderer_draw_trapezoid (PangoRenderer *renderer,
PangoRenderPart part,
@@ -431,6 +510,9 @@ gsk_pango_renderer_class_init (GskPangoRendererClass *klass)
renderer_class->draw_trapezoid = gsk_pango_renderer_draw_trapezoid;
renderer_class->draw_error_underline = gsk_pango_renderer_draw_error_underline;
renderer_class->draw_shape = gsk_pango_renderer_draw_shape;
#if PANGO_VERSION_CHECK(1,49,0)
renderer_class->draw_line = gsk_pango_renderer_draw_line;
#endif
renderer_class->prepare_run = gsk_pango_renderer_prepare_run;
}