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Fix markup drawing when font shadow enabled (fixes issue #709)

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This commit is contained in:
Chris Lee
2018-12-31 18:21:57 +01:00
parent cacd4b8dad
commit c76f056746
8 changed files with 85 additions and 35 deletions
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69
src/util/common.c
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@@ -724,27 +724,60 @@ void render_image(Drawable d, int x, int y)
XFreePixmap(server.display, pixmap);
}
void draw_text(PangoLayout *layout, cairo_t *c, int posx, int posy, Color *color, int font_shadow)
gboolean is_color_attribute(PangoAttribute *attr, gpointer user_data)
{
if (font_shadow) {
const int shadow_size = 3;
const double shadow_edge_alpha = 0.0;
int i, j;
for (i = -shadow_size; i <= shadow_size; i++) {
for (j = -shadow_size; j <= shadow_size; j++) {
cairo_set_source_rgba(c,
0.0,
0.0,
0.0,
1.0 -
(1.0 - shadow_edge_alpha) *
sqrt((i * i + j * j) / (double)(shadow_size * shadow_size)));
pango_cairo_update_layout(c, layout);
cairo_move_to(c, posx + i, posy + j);
pango_cairo_show_layout(c, layout);
}
return attr->klass->type == PANGO_ATTR_FOREGROUND ||
attr->klass->type == PANGO_ATTR_BACKGROUND ||
attr->klass->type == PANGO_ATTR_UNDERLINE_COLOR ||
attr->klass->type == PANGO_ATTR_STRIKETHROUGH_COLOR ||
attr->klass->type == PANGO_ATTR_FOREGROUND_ALPHA ||
attr->klass->type == PANGO_ATTR_BACKGROUND_ALPHA;
}
gboolean layout_set_markup_strip_colors(PangoLayout *layout, const char *markup)
{
PangoAttrList *attrs = NULL;
char *text = NULL;
GError *error = NULL;
if (!pango_parse_markup(markup, -1, 0, &attrs, &text, NULL, &error)) {
g_error_free(error);
return FALSE;
}
pango_layout_set_text(layout, text, -1);
g_free(text);
pango_attr_list_filter(attrs, is_color_attribute, NULL);
pango_layout_set_attributes(layout, attrs);
pango_attr_list_unref(attrs);
return TRUE;
}
void draw_shadow(cairo_t *c, int posx, int posy, PangoLayout *shadow_layout)
{
const int shadow_size = 3;
const double shadow_edge_alpha = 0.0;
int i, j;
for (i = -shadow_size; i <= shadow_size; i++) {
for (j = -shadow_size; j <= shadow_size; j++) {
cairo_set_source_rgba(c,
0.0,
0.0,
0.0,
1.0 -
(1.0 - shadow_edge_alpha) *
sqrt((i * i + j * j) / (double)(shadow_size * shadow_size)));
pango_cairo_update_layout(c, shadow_layout);
cairo_move_to(c, posx + i, posy + j);
pango_cairo_show_layout(c, shadow_layout);
}
}
}
void draw_text(PangoLayout *layout, cairo_t *c, int posx, int posy, Color *color, PangoLayout *shadow_layout)
{
if (shadow_layout)
draw_shadow(c, posx, posy, shadow_layout);
cairo_set_source_rgba(c, color->rgb[0], color->rgb[1], color->rgb[2], color->alpha);
pango_cairo_update_layout(c, layout);
cairo_move_to(c, posx, posy);