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xlib compositor: Support subpixel positioning

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As for the image compository, support a 4x4
subpixel grid.
This commit is contained in:
Matthias Clasen 2019-05-25 00:35:04 +00:00 • committed by Behdad Esfahbod
parent 6fd4222ab0
commit e4a79db010
1 changed files with 13 additions and 5 deletions
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18
src/cairo-xlib-render-compositor.c
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@ -1074,8 +1074,7 @@ _cairo_xlib_glyph_fini (cairo_scaled_glyph_private_t *glyph_private,
to_free->count = 0;
}
to_free->indices[to_free->count++] =
_cairo_scaled_glyph_index (glyph);
to_free->indices[to_free->count++] = glyph->hash_entry.hash;
}
cairo_list_del (&glyph_private->link);
@ -1193,7 +1192,7 @@ _cairo_xlib_surface_add_glyph (cairo_xlib_display_t *display,
cairo_bool_t already_had_glyph_surface;
cairo_xlib_font_glyphset_t *info;
glyph_index = _cairo_scaled_glyph_index (glyph);
glyph_index = glyph->hash_entry.hash;
/* check to see if we have a pending XRenderFreeGlyph for this glyph */
info = find_pending_free_glyph (display, font, glyph_index, glyph_surface);
@ -1570,6 +1569,9 @@ check_composite_glyphs (const cairo_composite_rectangles_t *extents,
* enough room for padding */
#define _cairo_sz_xGlyphElt (sz_xGlyphElt + 4)
#define PHASE(x) ((int)(floor (4 * (x + 0.125)) - 4 * floor (x + 0.125)))
#define POSITION(x) ((int) floor (x + 0.125))
static cairo_int_status_t
composite_glyphs (void *surface,
cairo_operator_t op,
@ -1605,9 +1607,15 @@ composite_glyphs (void *surface,
op = _render_operator (op),
_cairo_xlib_surface_ensure_picture (dst);
for (i = 0; i < num_glyphs; i++) {
int xphase, yphase;
int this_x, this_y;
int old_width;
xphase = PHASE(glyphs[i].d.x);
yphase = PHASE(glyphs[i].d.y);
glyphs[i].index |= (xphase << 24) | (yphase << 26);
status = _cairo_scaled_glyph_lookup (info->font,
glyphs[i].index,
CAIRO_SCALED_GLYPH_INFO_METRICS,
@ -1615,8 +1623,8 @@ composite_glyphs (void *surface,
if (unlikely (status))
return status;
this_x = _cairo_lround (glyphs[i].d.x);
this_y = _cairo_lround (glyphs[i].d.y);
this_x = POSITION (glyphs[i].d.x);
this_y = POSITION (glyphs[i].d.y);
/* Send unsent glyphs to the server */
if (glyph->dev_private_key != display) {