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LibDraw: Add GraphicsBitmap::create_purgeable()

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This allows you to create a process-private purgeable GraphicsBitmap.
The volatile flag is controlled via set_volatile() / set_nonvolatile().
This commit is contained in:
Andreas Kling 2019-12-18 20:50:05 +01:00
parent 72ec2fae6e
commit 77ae98a9b6
Notes: sideshowbarker 2024-07-19 10:49:09 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/77ae98a9b69
2 changed files with 47 additions and 4 deletions
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40
Libraries/LibDraw/GraphicsBitmap.cpp
View File

@ -9,17 +9,24 @@
NonnullRefPtr<GraphicsBitmap> GraphicsBitmap::create(Format format, const Size& size)
{
return adopt(*new GraphicsBitmap(format, size));
return adopt(*new GraphicsBitmap(format, size, Purgeable::No));
}
GraphicsBitmap::GraphicsBitmap(Format format, const Size& size)
NonnullRefPtr<GraphicsBitmap> GraphicsBitmap::create_purgeable(Format format, const Size& size)
{
return adopt(*new GraphicsBitmap(format, size, Purgeable::Yes));
}
GraphicsBitmap::GraphicsBitmap(Format format, const Size& size, Purgeable purgeable)
: m_size(size)
, m_pitch(round_up_to_power_of_two(size.width() * sizeof(RGBA32), 16))
, m_format(format)
, m_purgeable(purgeable == Purgeable::Yes)
{
if (format == Format::Indexed8)
m_palette = new RGBA32[256];
m_data = (RGBA32*)mmap_with_name(nullptr, size_in_bytes(), PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, 0, 0, String::format("GraphicsBitmap [%dx%d]", width(), height()).characters());
int map_flags = purgeable == Purgeable::Yes ? (MAP_PURGEABLE | MAP_PRIVATE) : (MAP_ANONYMOUS | MAP_PRIVATE);
m_data = (RGBA32*)mmap_with_name(nullptr, size_in_bytes(), PROT_READ | PROT_WRITE, map_flags, 0, 0, String::format("GraphicsBitmap [%dx%d]", width(), height()).characters());
ASSERT(m_data && m_data != (void*)-1);
m_needs_munmap = true;
}
@ -111,3 +118,30 @@ void GraphicsBitmap::fill(Color color)
fast_u32_fill(scanline, color.value(), width());
}
}
void GraphicsBitmap::set_volatile()
{
ASSERT(m_purgeable);
if (m_volatile)
return;
int rc = madvise(m_data, size_in_bytes(), MADV_SET_VOLATILE);
if (rc < 0) {
perror("madvise(MADV_SET_VOLATILE)");
ASSERT_NOT_REACHED();
}
m_volatile = true;
}
[[nodiscard]] bool GraphicsBitmap::set_nonvolatile()
{
ASSERT(m_purgeable);
if (!m_volatile)
return true;
int rc = madvise(m_data, size_in_bytes(), MADV_SET_NONVOLATILE);
if (rc < 0) {
perror("madvise(MADV_SET_NONVOLATILE)");
ASSERT_NOT_REACHED();
}
m_volatile = false;
return rc == 0;
}

11
Libraries/LibDraw/GraphicsBitmap.h
View File

@ -20,6 +20,7 @@ public:
};
static NonnullRefPtr<GraphicsBitmap> create(Format, const Size&);
static NonnullRefPtr<GraphicsBitmap> create_purgeable(Format, const Size&);
static NonnullRefPtr<GraphicsBitmap> create_wrapper(Format, const Size&, size_t pitch, RGBA32*);
static RefPtr<GraphicsBitmap> load_from_file(const StringView& path);
static RefPtr<GraphicsBitmap> load_from_file(Format, const StringView& path, const Size&);
@ -98,8 +99,14 @@ public:
set_pixel(position.x(), position.y(), color);
}
bool is_purgeable() const { return m_purgeable; }
bool is_volatile() const { return m_volatile; }
void set_volatile();
[[nodiscard]] bool set_nonvolatile();
private:
GraphicsBitmap(Format, const Size&);
enum class Purgeable { No, Yes };
GraphicsBitmap(Format, const Size&, Purgeable);
GraphicsBitmap(Format, const Size&, size_t pitch, RGBA32*);
GraphicsBitmap(Format, const Size&, MappedFile&&);
GraphicsBitmap(Format, NonnullRefPtr<SharedBuffer>&&, const Size&);
@ -110,6 +117,8 @@ private:
size_t m_pitch { 0 };
Format m_format { Format::Invalid };
bool m_needs_munmap { false };
bool m_purgeable { false };
bool m_volatile { false };
MappedFile m_mapped_file;
RefPtr<SharedBuffer> m_shared_buffer;
};