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scaled-scene-buffer: reduce unnecessary renderings

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Prior to this commit, a backing buffer with scale 1 was always created for
a scaled_scene_buffer before showing it, and backing buffers for specific
scales were created on output_enter events.

This commit removes this redundant re-renderings by calling
wlr_scene_buffer_set_dest_size() upon scaled_scene_buffer creation just to
receive output_enter events and delaying the first rendering to the first
output_enter event.

I needed to add font_get_buffer_size() to obtain the size of a font buffer
without actually creating it.
This commit is contained in:
tokyo4j 2024-12-03 16:18:52 +09:00 • committed by Hiroaki Yamamoto
parent cc838e79ed
commit 5db953aa89
6 changed files with 69 additions and 23 deletions
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23
src/common/font.c
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@ -79,6 +79,18 @@ font_width(struct font *font, const char *string)
return rectangle.width;
}
void
font_get_buffer_size(int max_width, const char *text, struct font *font,
int *width, int *height)
{
PangoRectangle text_extents = font_extents(font, text);
if (max_width > 0 && text_extents.width > max_width) {
text_extents.width = max_width;
}
*width = text_extents.width;
*height = text_extents.height;
}
void
font_buffer_create(struct lab_data_buffer **buffer, int max_width,
const char *text, struct font *font, const float *color,
@ -88,13 +100,10 @@ font_buffer_create(struct lab_data_buffer **buffer, int max_width,
return;
}
PangoRectangle text_extents = font_extents(font, text);
int width, height;
font_get_buffer_size(max_width, text, font, &width, &height);
if (max_width > 0 && text_extents.width > max_width) {
text_extents.width = max_width;
}
*buffer = buffer_create_cairo(text_extents.width, text_extents.height, scale);
*buffer = buffer_create_cairo(width, height, scale);
if (!*buffer) {
wlr_log(WLR_ERROR, "Failed to create font buffer");
return;
@ -127,7 +136,7 @@ font_buffer_create(struct lab_data_buffer **buffer, int max_width,
PangoLayout *layout = pango_cairo_create_layout(cairo);
pango_context_set_round_glyph_positions(pango_layout_get_context(layout), false);
pango_layout_set_width(layout, text_extents.width * PANGO_SCALE);
pango_layout_set_width(layout, width * PANGO_SCALE);
pango_layout_set_text(layout, text, -1);
pango_layout_set_ellipsize(layout, PANGO_ELLIPSIZE_END);