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xcb: Cache whether we have already check a glyph for size.

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Avoid repeated cairo_scaled_glyph_lookup() and checking of sizes if we
have already seen this glyph in this run.
This commit is contained in:
Chris Wilson 2010-03-30 15:26:42 +01:00
parent 1c76e3e9ad
commit 5c4b6d520b
1 changed files with 10 additions and 0 deletions
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10
src/cairo-xcb-surface-render.c
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@ -3603,14 +3603,22 @@ _can_composite_glyphs (cairo_xcb_surface_t *dst,
cairo_glyph_t *glyphs,
int num_glyphs)
{
unsigned long glyph_cache[64];
cairo_status_t status;
const int max_glyph_size = dst->connection->maximum_request_length - 64;
int i;
memset (glyph_cache, 0, sizeof (glyph_cache));
/* first scan for oversized glyphs, and fallback in that case */
for (i = 0; i < num_glyphs; i++) {
cairo_scaled_glyph_t *scaled_glyph;
int width, height, len;
int g;
g = glyphs[i].index % ARRAY_LENGTH (glyph_cache);
if (glyph_cache[g] == glyphs[i].index)
continue;
status = _cairo_scaled_glyph_lookup (scaled_font,
glyphs[i].index,
@ -3629,6 +3637,8 @@ _can_composite_glyphs (cairo_xcb_surface_t *dst,
len = CAIRO_STRIDE_FOR_WIDTH_BPP (width, 32) * height;
if (len >= max_glyph_size)
return CAIRO_INT_STATUS_UNSUPPORTED;
glyph_cache[g] = glyphs[i].index;
}
return CAIRO_STATUS_SUCCESS;