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Draw Pango backgrounds and underlines through Cairo (#145)

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Filter out underline and bg and draw it ourselves
This commit is contained in:
NBonaparte 2017-03-29 14:32:43 -07:00 • committed by GitHub
parent 89925b565a
commit e96cc9ae72
1 changed files with 85 additions and 8 deletions
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93
src/ya_draw.c
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@ -658,6 +658,22 @@ void ya_draw_text_var_width(ya_block_t * blk) {
#endif //YA_VAR_WIDTH
/*
* This filters out the underline and background attributes so we can separate them
*/
static gboolean filter(PangoAttribute *attribute, gpointer user_data) {
switch(attribute->klass->type) {
case PANGO_ATTR_UNDERLINE_COLOR:
case PANGO_ATTR_UNDERLINE:
case PANGO_ATTR_BACKGROUND:
#if (PANGO_VERSION_MAJOR == 1 && PANGO_VERSION_MINOR >= 38)
case PANGO_ATTR_BACKGROUND_ALPHA:
#endif
return true;
default:
return false;
}
}
/*
* Here is how the text buffer of a block is rendered on the screen
*/
@ -694,12 +710,6 @@ void ya_draw_pango_text(struct ya_block *blk) {
PangoLayout *layout = pango_layout_new(context);
pango_layout_set_font_description(layout, blk->bar->desc);
cairo_set_source_rgba(cr,
GET_RED(blk->fgcolor),
GET_GREEN(blk->fgcolor),
GET_BLUE(blk->fgcolor),
GET_ALPHA(blk->fgcolor));
//fprintf(stderr, "010=%s\n", blk->name);
#ifdef YA_DYN_COL
//Start drawing text at strbuf member, where !Y COLORS Y! config ends.
@ -730,8 +740,6 @@ void ya_draw_pango_text(struct ya_block *blk) {
pango_layout_set_ellipsize(layout, PANGO_ELLIPSIZE_END);
int offset = (blk->bar->height - ht)/2 + blk->bar->oosize;
cairo_move_to(cr, 0, offset);
pango_cairo_show_layout(cr, layout);
cairo_move_to(cr, 0, offset);
//Draw overline if defined
if(blk->attr & BLKA_OVERLINE) {
@ -754,6 +762,75 @@ void ya_draw_pango_text(struct ya_block *blk) {
cairo_fill(cr);
}
//retrieve list of attributes; we will filter it to look for underline and background attrs
//so we can draw it ourselves
PangoAttrList *orig = pango_layout_get_attributes(layout), *list;
//filtering results in a new list with only the filtered attributes (see filter function)
if(orig != NULL && (list = pango_attr_list_filter(orig, filter, NULL)) != NULL) {
PangoAttrIterator *it = pango_attr_list_get_iterator(list);
do {
PangoAttribute *attr;
PangoRectangle rect1, rect2;
gint start, end;
//get the starting and ending byte position for the attribute, and their positional data
//note that PangoRectangle units are in Pango units, so we have to divide by PANGO_SCALE
pango_attr_iterator_range(it, &start, &end);
pango_layout_index_to_pos(layout, start, &rect1);
pango_layout_index_to_pos(layout, end, &rect2);
if((attr = pango_attr_iterator_get(it, PANGO_ATTR_BACKGROUND)) != NULL) {
PangoColor color = ((PangoAttrColor *)attr)->color;
int alpha = G_MAXUINT16;
//bgalpha is only available on Pango >= 1.38, use if specified
#if (PANGO_VERSION_MAJOR == 1 && PANGO_VERSION_MINOR >= 38)
if((attr = pango_attr_iterator_get(it, PANGO_ATTR_BACKGROUND_ALPHA)) != NULL)
alpha = ((PangoAttrInt *)attr)->value;
#endif
cairo_set_source_rgba(cr,
(double)color.red/G_MAXUINT16,
(double)color.green/G_MAXUINT16,
(double)color.blue/G_MAXUINT16,
(double)alpha/G_MAXUINT16);
//create the background rectangle using the starting and ending positions
cairo_rectangle(cr, rect1.x/PANGO_SCALE, 0,
rect2.x/PANGO_SCALE - rect1.x/PANGO_SCALE, blk->bar->height);
cairo_fill(cr);
}
//make sure that the underline attribute value isn't 0 (there actually is underline)
if((attr = pango_attr_iterator_get(it, PANGO_ATTR_UNDERLINE)) != NULL &&
((PangoAttrInt *)attr)->value) {
//if underline color is specified, set the source to be that color
if((attr = pango_attr_iterator_get(it, PANGO_ATTR_UNDERLINE_COLOR)) != NULL)
cairo_set_source_rgb(cr,
(double)((PangoAttrColor *)attr)->color.red/G_MAXUINT16,
(double)((PangoAttrColor *)attr)->color.green/G_MAXUINT16,
(double)((PangoAttrColor *)attr)->color.blue/G_MAXUINT16);
//if not, use foreground color
else
cairo_set_source_rgba(cr,
GET_RED(blk->fgcolor),
GET_GREEN(blk->fgcolor),
GET_BLUE(blk->fgcolor),
GET_ALPHA(blk->fgcolor));
//create the underline rectangle using the starting and ending positions
cairo_rectangle(cr, rect1.x/PANGO_SCALE, blk->bar->height - blk->bar->ulsize,
rect2.x/PANGO_SCALE - rect1.x/PANGO_SCALE, blk->bar->ulsize);
cairo_fill(cr);
}
} while(pango_attr_iterator_next(it));
pango_attr_iterator_destroy(it);
pango_attr_list_unref(list);
}
cairo_set_source_rgba(cr,
GET_RED(blk->fgcolor),
GET_GREEN(blk->fgcolor),
GET_BLUE(blk->fgcolor),
GET_ALPHA(blk->fgcolor));
cairo_move_to(cr, 0, offset);
pango_cairo_show_layout(cr, layout);
cairo_surface_flush(surface);
xcb_copy_area(ya.c, blk->pixmap, blk->bar->win, blk->gc, 0,0,blk->shift, 0, blk->width, blk->bar->height);
xcb_flush(ya.c);