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[cairo-gstate] Use a local buffer on the stack for small glyph operations

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We duplicate the incoming glyph array for two reasons: 1) applying
transformations, and 2) to let the lower level functions have a glyph array
they can modify.  By using a 2kb array on the stack we can avoid malloc() for
requests of less than 100 glyphs.  The size of the array can be tuned by
setting CAIRO_STACK_BUFFER_SIZE.
This commit is contained in:
Behdad Esfahbod 2006-12-11 03:13:34 -05:00
parent da60bc45f2
commit e7ed9eee76
1 changed files with 23 additions and 7 deletions
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30
src/cairo-gstate.c
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@ -1464,6 +1464,7 @@ _cairo_gstate_glyph_extents (cairo_gstate_t *gstate,
return CAIRO_STATUS_SUCCESS;
}
#define STACK_GLYPHS_LEN ((int) (CAIRO_STACK_BUFFER_SIZE / sizeof (cairo_glyph_t)))
cairo_status_t
_cairo_gstate_show_glyphs (cairo_gstate_t *gstate,
const cairo_glyph_t *glyphs,
@ -1472,6 +1473,8 @@ _cairo_gstate_show_glyphs (cairo_gstate_t *gstate,
cairo_status_t status;
cairo_pattern_union_t source_pattern;
cairo_glyph_t *transformed_glyphs;
cairo_glyph_t stack_transformed_glyphs[STACK_GLYPHS_LEN];
if (gstate->source->status)
return gstate->source->status;
@ -1484,9 +1487,13 @@ _cairo_gstate_show_glyphs (cairo_gstate_t *gstate,
if (status)
return status;
transformed_glyphs = malloc (num_glyphs * sizeof(cairo_glyph_t));
if (transformed_glyphs == NULL)
return CAIRO_STATUS_NO_MEMORY;
if (num_glyphs <= STACK_GLYPHS_LEN) {
transformed_glyphs = stack_transformed_glyphs;
} else {
transformed_glyphs = malloc (num_glyphs * sizeof(cairo_glyph_t));
if (transformed_glyphs == NULL)
return CAIRO_STATUS_NO_MEMORY;
}
_cairo_gstate_transform_glyphs_to_backend (gstate, glyphs, num_glyphs,
transformed_glyphs);
@ -1501,7 +1508,9 @@ _cairo_gstate_show_glyphs (cairo_gstate_t *gstate,
gstate->scaled_font);
_cairo_pattern_fini (&source_pattern.base);
free (transformed_glyphs);
if (transformed_glyphs != stack_transformed_glyphs)
free (transformed_glyphs);
return status;
}
@ -1513,13 +1522,17 @@ _cairo_gstate_glyph_path (cairo_gstate_t *gstate,
cairo_path_fixed_t *path)
{
cairo_status_t status;
cairo_glyph_t *transformed_glyphs = NULL;
cairo_glyph_t *transformed_glyphs;
cairo_glyph_t stack_transformed_glyphs[STACK_GLYPHS_LEN];
status = _cairo_gstate_ensure_scaled_font (gstate);
if (status)
return status;
transformed_glyphs = malloc (num_glyphs * sizeof(cairo_glyph_t));
if (num_glyphs < STACK_GLYPHS_LEN)
transformed_glyphs = stack_transformed_glyphs;
else
transformed_glyphs = malloc (num_glyphs * sizeof(cairo_glyph_t));
if (transformed_glyphs == NULL)
return CAIRO_STATUS_NO_MEMORY;
@ -1530,9 +1543,12 @@ _cairo_gstate_glyph_path (cairo_gstate_t *gstate,
transformed_glyphs, num_glyphs,
path);
free (transformed_glyphs);
if (transformed_glyphs != stack_transformed_glyphs)
free (transformed_glyphs);
return status;
}
#undef STACK_GLYPHS_LEN
cairo_status_t
_cairo_gstate_set_antialias (cairo_gstate_t *gstate,