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AK: Make Bitmap use size_t for its size

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Also rework its API's to return Optional<size_t> instead of int with -1
as the error value.
This commit is contained in:
Andreas Kling 2020-02-24 09:55:46 +01:00
parent b813b2f871
commit 0763f67043
4 changed files with 34 additions and 32 deletions
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50
AK/Bitmap.h
View file

@ -28,6 +28,7 @@
#include <AK/Assertions.h>
#include <AK/Noncopyable.h>
#include <AK/Optional.h>
#include <AK/StdLibExtras.h>
#include <AK/Types.h>
#include <AK/kmalloc.h>
@ -79,13 +80,13 @@ public:
m_data = nullptr;
}
int size() const { return m_size; }
bool get(int index) const
size_t size() const { return m_size; }
bool get(size_t index) const
{
ASSERT(index < m_size);
return 0 != (m_data[index / 8] & (1u << (index % 8)));
}
void set(int index, bool value) const
void set(size_t index, bool value) const
{
ASSERT(index < m_size);
if (value)
@ -97,7 +98,7 @@ public:
u8* data() { return m_data; }
const u8* data() const { return m_data; }
void grow(int size, bool default_value)
void grow(size_t size, bool default_value)
{
ASSERT(size > m_size);
@ -129,27 +130,28 @@ public:
memset(m_data, value ? 0xff : 0x00, size_in_bytes());
}
int find_first_set() const
Optional<size_t> find_first_set() const
{
int i = 0;
size_t i = 0;
while (i < m_size / 8 && m_data[i] == 0x00)
i++;
int j = 0;
for (j = i * 8; j < m_size; j++)
size_t j = 0;
for (j = i * 8; j < m_size; j++) {
if (get(j))
return j;
}
return -1;
return {};
}
int find_first_unset() const
Optional<size_t> find_first_unset() const
{
int i = 0;
size_t i = 0;
while (i < m_size / 8 && m_data[i] == 0xff)
i++;
int j = 0;
size_t j = 0;
for (j = i * 8; j < m_size; j++)
if (!get(j))
return j;
@ -157,20 +159,20 @@ public:
return -1;
}
int find_longest_range_of_unset_bits(int max_length, int& found_range_size) const
Optional<size_t> find_longest_range_of_unset_bits(size_t max_length, size_t& found_range_size) const
{
int first_index = find_first_unset();
if (first_index == -1)
return -1;
auto first_index = find_first_unset();
if (!first_index.has_value())
return {};
int free_region_start = first_index;
int free_region_size = 1;
size_t free_region_start = first_index;
size_t free_region_size = 1;
int max_region_start = free_region_start;
int max_region_size = free_region_size;
size_t max_region_start = free_region_start;
size_t max_region_size = free_region_size;
// Let's try and find the best fit possible
for (int j = first_index + 1; j < m_size && free_region_size < max_length; j++) {
for (size_t j = first_index + 1; j < m_size && free_region_size < max_length; j++) {
if (!get(j)) {
if (free_region_size == 0)
free_region_start = j;
@ -204,7 +206,7 @@ public:
m_data = nullptr;
}
explicit Bitmap(int size, bool default_value)
explicit Bitmap(size_t size, bool default_value)
: m_size(size)
, m_owned(true)
{
@ -221,10 +223,10 @@ public:
}
private:
int size_in_bytes() const { return ceil_div(m_size, 8); }
size_t size_in_bytes() const { return ceil_div(m_size, 8); }
u8* m_data { nullptr };
int m_size { 0 };
size_t m_size { 0 };
bool m_owned { false };
};