From: Jeff King <peff@xxxxxxxx>
There's no easy way to make a copy of a bitmap. Obviously a caller can
iterate over the bits and set them one by one in a new bitmap, but we
can go much faster by copying whole words with memcpy().
Signed-off-by: Jeff King <peff@xxxxxxxx>
Signed-off-by: Taylor Blau <me@xxxxxxxxxxxx>
---
ewah/bitmap.c | 7 +++++++
ewah/ewok.h | 1 +
2 files changed, 8 insertions(+)
diff --git a/ewah/bitmap.c b/ewah/bitmap.c
index c3f8e7242b..eb7e2539be 100644
--- a/ewah/bitmap.c
+++ b/ewah/bitmap.c
@@ -35,6 +35,13 @@ struct bitmap *bitmap_new(void)
return bitmap_word_alloc(32);
}
+struct bitmap *bitmap_dup(const struct bitmap *src)
+{
+ struct bitmap *dst = bitmap_word_alloc(src->word_alloc);
+ COPY_ARRAY(dst->words, src->words, src->word_alloc);
+ return dst;
+}
+
static void bitmap_grow(struct bitmap *self, size_t word_alloc)
{
if (word_alloc > self->word_alloc) {
diff --git a/ewah/ewok.h b/ewah/ewok.h
index 011852bef1..1fc555e672 100644
--- a/ewah/ewok.h
+++ b/ewah/ewok.h
@@ -173,6 +173,7 @@ struct bitmap {
struct bitmap *bitmap_new(void);
struct bitmap *bitmap_word_alloc(size_t word_alloc);
+struct bitmap *bitmap_dup(const struct bitmap *src);
void bitmap_set(struct bitmap *self, size_t pos);
void bitmap_unset(struct bitmap *self, size_t pos);
int bitmap_get(struct bitmap *self, size_t pos);
--
2.29.2.156.gc03786897f
