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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
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;
}