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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "cc/resources/shared_bitmap.h"
#include "base/logging.h"
#include "base/numerics/safe_math.h"
#include "base/rand_util.h"
namespace cc {
SharedBitmap::SharedBitmap(uint8* pixels, const SharedBitmapId& id)
: pixels_(pixels), id_(id) {
}
SharedBitmap::~SharedBitmap() {
}
// static
bool SharedBitmap::SizeInBytes(const gfx::Size& size, size_t* size_in_bytes) {
if (size.IsEmpty())
return false;
base::CheckedNumeric<size_t> s = 4;
s *= size.width();
s *= size.height();
if (!s.IsValid())
return false;
*size_in_bytes = s.ValueOrDie();
return true;
}
// static
size_t SharedBitmap::CheckedSizeInBytes(const gfx::Size& size) {
CHECK(!size.IsEmpty());
base::CheckedNumeric<size_t> s = 4;
s *= size.width();
s *= size.height();
return s.ValueOrDie();
}
// static
size_t SharedBitmap::UncheckedSizeInBytes(const gfx::Size& size) {
DCHECK(VerifySizeInBytes(size));
size_t s = 4;
s *= size.width();
s *= size.height();
return s;
}
// static
bool SharedBitmap::VerifySizeInBytes(const gfx::Size& size) {
if (size.IsEmpty())
return false;
base::CheckedNumeric<size_t> s = 4;
s *= size.width();
s *= size.height();
return s.IsValid();
}
// static
SharedBitmapId SharedBitmap::GenerateId() {
SharedBitmapId id;
// Needs cryptographically-secure random numbers.
base::RandBytes(id.name, sizeof(id.name));
return id;
}
} // namespace cc
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