Delete dead code. SkBitmapHasher has not been used since gm.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1704783002

Review URL: https://codereview.chromium.org/1704783002

2 files changed, 0 insertions, 99 deletions

diff --git a/src/utils/SkBitmapHasher.cpp b/src/utils/SkBitmapHasher.cpp
deleted file mode 100644
index 32ff1cb081..0000000000
--- a/src/utils/SkBitmapHasher.cpp
+++ /dev/null
@@ -1,64 +0,0 @@
-/*
- * Copyright 2012 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#include "SkBitmap.h"
-#include "SkBitmapHasher.h"
-#include "SkEndian.h"
-#include "SkImageEncoder.h"
-
-#include "SkMD5.h"
-
-/**
- * Write an int32 value to a stream in little-endian order.
- */
-static void write_int32_to_buffer(uint32_t val, SkWStream* out) {
-    val = SkEndian_SwapLE32(val);
-    for (size_t byte = 0; byte < 4; ++byte) {
-        out->write8((uint8_t)(val & 0xff));
-        val = val >> 8;
-    }
-}
-
-/**
- * Return the first 8 bytes of a bytearray, encoded as a little-endian uint64.
- */
-static inline uint64_t first_8_bytes_as_uint64(const uint8_t *bytearray) {
-    return SkEndian_SwapLE64(*(reinterpret_cast<const uint64_t *>(bytearray)));
-}
-
-/*static*/ bool SkBitmapHasher::ComputeDigestInternal(const SkBitmap& bitmap, uint64_t *result) {
-    SkMD5 out;
-
-    // start with the x/y dimensions
-    write_int32_to_buffer(SkToU32(bitmap.width()), &out);
-    write_int32_to_buffer(SkToU32(bitmap.height()), &out);
-
-    // add all the pixel data
-    SkAutoTDelete<SkImageEncoder> enc(CreateARGBImageEncoder());
-    if (!enc->encodeStream(&out, bitmap, SkImageEncoder::kDefaultQuality)) {
-        return false;
-    }
-
-    SkMD5::Digest digest;
-    out.finish(digest);
-    *result = first_8_bytes_as_uint64(digest.data);
-    return true;
-}
-
-/*static*/ bool SkBitmapHasher::ComputeDigest(const SkBitmap& bitmap, uint64_t *result) {
-    if (ComputeDigestInternal(bitmap, result)) {
-        return true;
-    }
-
-    // Hmm, that didn't work. Maybe if we create a new
-    // version of the bitmap it will work better?
-    SkBitmap copyBitmap;
-    if (!bitmap.copyTo(&copyBitmap, kN32_SkColorType)) {
-        return false;
-    }
-    return ComputeDigestInternal(copyBitmap, result);
-}
diff --git a/src/utils/SkBitmapHasher.h b/src/utils/SkBitmapHasher.h
deleted file mode 100644
index c8a5c0406f..0000000000
--- a/src/utils/SkBitmapHasher.h
+++ /dev/null
@@ -1,35 +0,0 @@
-
-/*
- * Copyright 2012 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#ifndef SkBitmapHasher_DEFINED
-#define SkBitmapHasher_DEFINED
-
-#include "SkBitmap.h"
-
-/**
- * Static class that generates a uint64 hash digest from an SkBitmap.
- */
-class SkBitmapHasher {
-public:
-    /**
-     * Fills in "result" with a hash of the pixels in this bitmap.
-     *
-     * If this is unable to compute the hash for some reason,
-     * it returns false.
-     *
-     * Note: depending on the bitmap colortype, we may need to create an
-     * intermediate SkBitmap and copy the pixels over to it... so in some
-     * cases, performance and memory usage can suffer.
-     */
-    static bool ComputeDigest(const SkBitmap& bitmap, uint64_t *result);
-
-private:
-    static bool ComputeDigestInternal(const SkBitmap& bitmap, uint64_t *result);
-};
-
-#endif