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LibGfx: Allow creating a Gfx::Bitmap backed by an anonymous file
Gfx::Bitmap::create_with_anon_fd() creates such a Bitmap, and also optionally takes ownership of the file, making sure to close() it on destruction.
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fb4993f067
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4d97b955e6
2 changed files with 50 additions and 0 deletions
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@ -182,6 +182,29 @@ static bool check_size(const IntSize& size, BitmapFormat format, unsigned actual
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return true;
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}
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RefPtr<Bitmap> Bitmap::create_with_anon_fd(BitmapFormat format, int anon_fd, const IntSize& size, ShouldCloseAnonymousFile should_close_anon_fd)
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{
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if (size_would_overflow(format, size))
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return nullptr;
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const auto pitch = minimum_pitch(size.width(), format);
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const auto data_size_in_bytes = size_in_bytes(pitch, size.height());
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auto* data = mmap(nullptr, round_up_to_power_of_two(data_size_in_bytes, PAGE_SIZE), PROT_READ | PROT_WRITE, MAP_FILE | MAP_SHARED, anon_fd, 0);
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if (data == MAP_FAILED) {
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perror("mmap");
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return nullptr;
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}
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if (should_close_anon_fd == ShouldCloseAnonymousFile::Yes) {
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int rc = close(anon_fd);
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ASSERT(rc == 0);
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anon_fd = -1;
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}
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return adopt(*new Bitmap(format, anon_fd, size, data));
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}
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RefPtr<Bitmap> Bitmap::create_with_shared_buffer(BitmapFormat format, NonnullRefPtr<SharedBuffer>&& shared_buffer, const IntSize& size, const Vector<RGBA32>& palette)
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{
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if (size_would_overflow(format, size))
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@ -293,6 +316,19 @@ Bitmap::Bitmap(BitmapFormat format, NonnullRefPtr<SharedBuffer>&& shared_buffer,
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allocate_palette_from_format(m_format, palette);
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}
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Bitmap::Bitmap(BitmapFormat format, int anon_fd, const IntSize& size, void* data)
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: m_size(size)
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, m_data(data)
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, m_pitch(minimum_pitch(size.width(), format))
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, m_format(format)
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, m_needs_munmap(true)
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, m_purgeable(true)
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, m_anon_fd(anon_fd)
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{
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ASSERT(!is_indexed());
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ASSERT(!size_would_overflow(format, size));
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}
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RefPtr<Gfx::Bitmap> Bitmap::clone() const
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{
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RefPtr<Gfx::Bitmap> new_bitmap {};
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@ -378,6 +414,10 @@ Bitmap::~Bitmap()
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int rc = munmap(m_data, size_in_bytes());
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ASSERT(rc == 0);
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}
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if (m_anon_fd != -1) {
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int rc = close(m_anon_fd);
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ASSERT(rc == 0);
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}
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m_data = nullptr;
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delete[] m_palette;
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}
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@ -88,11 +88,17 @@ enum RotationDirection {
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class Bitmap : public RefCounted<Bitmap> {
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public:
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enum class ShouldCloseAnonymousFile {
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No,
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Yes,
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};
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static RefPtr<Bitmap> create(BitmapFormat, const IntSize&);
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static RefPtr<Bitmap> create_shareable(BitmapFormat, const IntSize&);
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static RefPtr<Bitmap> create_purgeable(BitmapFormat, const IntSize&);
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static RefPtr<Bitmap> create_wrapper(BitmapFormat, const IntSize&, size_t pitch, void*);
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static RefPtr<Bitmap> load_from_file(const StringView& path);
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static RefPtr<Bitmap> create_with_anon_fd(BitmapFormat, int anon_fd, const IntSize&, ShouldCloseAnonymousFile);
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static RefPtr<Bitmap> create_with_shared_buffer(BitmapFormat, NonnullRefPtr<SharedBuffer>&&, const IntSize&);
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static RefPtr<Bitmap> create_with_shared_buffer(BitmapFormat, NonnullRefPtr<SharedBuffer>&&, const IntSize&, const Vector<RGBA32>& palette);
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static RefPtr<Bitmap> create_from_serialized_byte_buffer(ByteBuffer&& buffer);
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@ -224,6 +230,8 @@ public:
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void set_volatile();
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[[nodiscard]] bool set_nonvolatile();
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int anon_fd() const { return m_anon_fd; }
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private:
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enum class Purgeable {
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No,
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@ -232,6 +240,7 @@ private:
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Bitmap(BitmapFormat, const IntSize&, Purgeable, const BackingStore&);
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Bitmap(BitmapFormat, const IntSize&, size_t pitch, void*);
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Bitmap(BitmapFormat, NonnullRefPtr<SharedBuffer>&&, const IntSize&, const Vector<RGBA32>& palette);
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Bitmap(BitmapFormat, int anon_fd, const IntSize&, void*);
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static Optional<BackingStore> allocate_backing_store(BitmapFormat, const IntSize&, Purgeable);
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@ -246,6 +255,7 @@ private:
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bool m_purgeable { false };
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bool m_volatile { false };
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RefPtr<SharedBuffer> m_shared_buffer;
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int m_anon_fd { -1 };
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};
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inline u8* Bitmap::scanline_u8(int y)
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