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[gl] Simplify the common CLEAR of a surface

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Almost every surface is at sometime cleared, so catch the operation in
paint(), and emit a simple glClear() instead.
This commit is contained in:
Chris Wilson 2009-07-23 14:46:16 +01:00
parent eed17527f6
commit f5a1cdf283
1 changed files with 24 additions and 1 deletions
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25
src/cairo-gl-surface.c
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@ -1861,6 +1861,29 @@ _cairo_gl_surface_get_font_options (void *abstract_surface,
cairo_font_options_set_hint_metrics (options, CAIRO_HINT_METRICS_ON);
}
static cairo_int_status_t
_cairo_gl_surface_paint (void *abstract_surface,
cairo_operator_t op,
const cairo_pattern_t *source,
cairo_clip_t *clip)
{
/* simplify the common case of clearing the surface */
if (op == CAIRO_OPERATOR_CLEAR && clip == NULL) {
cairo_gl_surface_t *surface = abstract_surface;
cairo_gl_context_t *ctx;
ctx = _cairo_gl_context_acquire (surface->ctx);
_cairo_gl_set_destination (surface);
glClear (GL_COLOR_BUFFER_BIT);
_cairo_gl_context_release (ctx);
return CAIRO_STATUS_SUCCESS;
}
return CAIRO_INT_STATUS_UNSUPPORTED;
}
static const cairo_surface_backend_t _cairo_gl_surface_backend = {
CAIRO_SURFACE_TYPE_GL,
_cairo_gl_surface_create_similar,
@ -1886,7 +1909,7 @@ static const cairo_surface_backend_t _cairo_gl_surface_backend = {
NULL, /* mark_dirty_rectangle */
NULL, /* scaled_font_fini */
NULL, /* scaled_glyph_fini */
NULL, /* paint */
_cairo_gl_surface_paint,
NULL, /* mask */
NULL, /* stroke */
NULL, /* fill */