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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/390223051): Remove C-library calls to fix the errors.
#pragma allow_unsafe_libc_calls
#endif
#include "ui/gfx/skia_util.h"
#include "base/check.h"
#include "base/numerics/safe_conversions.h"
#include "third_party/skia/include/core/SkBitmap.h"
namespace gfx {
bool BitmapsAreEqual(const SkBitmap& bitmap1, const SkBitmap& bitmap2) {
if (bitmap1.isNull() != bitmap2.isNull() ||
bitmap1.dimensions() != bitmap2.dimensions())
return false;
if (bitmap1.getGenerationID() == bitmap2.getGenerationID() ||
(bitmap1.empty() && bitmap2.empty()))
return true;
// Calling getAddr32() on null or empty bitmaps will assert. The conditions
// above should return early if either bitmap is empty or null.
DCHECK(!bitmap1.isNull() && !bitmap2.isNull());
DCHECK(!bitmap1.empty() && !bitmap2.empty());
void* addr1 = bitmap1.getAddr32(0, 0);
void* addr2 = bitmap2.getAddr32(0, 0);
size_t size1 = bitmap1.computeByteSize();
size_t size2 = bitmap2.computeByteSize();
return (size1 == size2) && (0 == memcmp(addr1, addr2, size1));
}
// We treat HarfBuzz ints as 16.16 fixed-point.
static const int kHbUnit1 = 1 << 16;
int SkiaScalarToHarfBuzzUnits(SkScalar value) {
return base::saturated_cast<int>(value * kHbUnit1);
}
SkScalar HarfBuzzUnitsToSkiaScalar(int value) {
static const SkScalar kSkToHbRatio = SK_Scalar1 / kHbUnit1;
return kSkToHbRatio * value;
}
float HarfBuzzUnitsToFloat(int value) {
static const float kFloatToHbRatio = 1.0f / kHbUnit1;
return kFloatToHbRatio * value;
}
} // namespace gfx
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