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damage-refinery: Hash directly instead of copying

pixman-rendering
Andri Yngvason 2020-06-22 19:37:25 +00:00
parent a4e1a957c9
commit 7fda124c69
1 changed files with 10 additions and 12 deletions
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22
src/damage-refinery.c
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@ -33,11 +33,10 @@ void damage_refinery_destroy(struct damage_refinery* self)
free(self->hashes);
}
static size_t damage_copy_tile(struct damage_refinery* self, void* tile_buffer,
uint32_t tx, uint32_t ty, const struct wv_buffer* buffer)
static uint32_t damage_hash_tile(struct damage_refinery* self, uint32_t tx,
uint32_t ty, const struct wv_buffer* buffer)
{
// TODO: Support different pixel sizes
uint32_t* tile = tile_buffer;
uint32_t* pixels = buffer->pixels;
int pixel_stride = buffer->stride / 4;
@ -46,17 +45,18 @@ static size_t damage_copy_tile(struct damage_refinery* self, void* tile_buffer,
pixel_stride *= -1;
}
size_t i = 0;
int x_start = tx * 32;
int x_stop = MIN(((int)tx + 1) * 32, buffer->width);
int x_stop = MIN((tx + 1) * 32, self->width);
int y_start = ty * 32;
int y_stop = MIN(((int)ty + 1) * 32, buffer->height);
int y_stop = MIN((ty + 1) * 32, self->height);
uint32_t hash = 0;
for (int y = y_start; y < y_stop; ++y)
for (int x = x_start; x < x_stop; ++x)
tile[i++] = pixels[x + y * pixel_stride];
hash = murmurhash((void*)&(pixels[x_start + y * pixel_stride]),
4 * (x_stop - x_start), hash);
return i;
return hash;
}
static uint32_t* damage_tile_hash_ptr(struct damage_refinery* self,
@ -70,9 +70,7 @@ static void damage_refine_tile(struct damage_refinery* self,
struct pixman_region16* refined, uint32_t tx, uint32_t ty,
const struct wv_buffer* buffer)
{
uint32_t tile[32 * 32];
size_t len = damage_copy_tile(self, tile, tx, ty, buffer);
uint32_t hash = murmurhash((void*)tile, len, HASH_SEED);
uint32_t hash = damage_hash_tile(self, tx, ty, buffer);
uint32_t* old_hash_ptr = damage_tile_hash_ptr(self, tx, ty);
int is_damaged = hash != *old_hash_ptr;
*old_hash_ptr = hash;