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[image] Clone the format for a similar surface with identical content

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Honour the incoming surface format when we are asked to create a similar
surface with identical content. The goal of
cairo_surface_create_similar() is to create an intermediate with similar
characteristics to the original that can be used in place of the
original and be quick to copy to the original. Matching the format for
the same content, ensures that the blits between the two need only be a
memcpy.
This commit is contained in:
Chris Wilson 2009-10-16 08:43:21 +01:00
parent ed94d7caad
commit 6a19a82efd
1 changed files with 9 additions and 2 deletions
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11
src/cairo-image-surface.c
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@ -760,12 +760,19 @@ _cairo_format_bits_per_pixel (cairo_format_t format)
}
static cairo_surface_t *
_cairo_image_surface_create_similar (void *abstract_src,
_cairo_image_surface_create_similar (void *abstract_other,
cairo_content_t content,
int width,
int height)
{
assert (CAIRO_CONTENT_VALID (content));
cairo_image_surface_t *other = abstract_other;
if (content == other->base.content) {
return _cairo_image_surface_create_with_pixman_format (NULL,
other->pixman_format,
width, height,
0);
}
return _cairo_image_surface_create_with_content (content,
width, height);