ladybird/SharedGraphics/GraphicsBitmap.cpp

#include <SharedGraphics/GraphicsBitmap.h>
#include <SharedGraphics/PNGLoader.h>
#include <AK/MappedFile.h>
#include <sys/mman.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <stdio.h>

Retained<GraphicsBitmap> GraphicsBitmap::create(Format format, const Size& size)
{
    return adopt(*new GraphicsBitmap(format, size));
}

GraphicsBitmap::GraphicsBitmap(Format format, const Size& size)
    : m_size(size)
    , m_pitch(size.width() * sizeof(RGBA32))
    , m_format(format)
{
    size_t size_in_bytes = size.area() * sizeof(RGBA32);
    m_data = (RGBA32*)mmap(nullptr, size_in_bytes, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, 0, 0);
    ASSERT(m_data && m_data != (void*)-1);
    m_needs_munmap = true;
    set_mmap_name(String::format("GraphicsBitmap [%dx%d]", width(), height()).characters());
}

Retained<GraphicsBitmap> GraphicsBitmap::create_wrapper(Format format, const Size& size, RGBA32* data)
{
    return adopt(*new GraphicsBitmap(format, size, data));
}

RetainPtr<GraphicsBitmap> GraphicsBitmap::load_from_file(const String& path)
{
    return load_png(path);
}

RetainPtr<GraphicsBitmap> GraphicsBitmap::load_from_file(Format format, const String& path, const Size& size)
{
    MappedFile mapped_file(path);
    if (!mapped_file.is_valid())
        return nullptr;
    return adopt(*new GraphicsBitmap(format, size, move(mapped_file)));
}

GraphicsBitmap::GraphicsBitmap(Format format, const Size& size, RGBA32* data)
    : m_size(size)
    , m_data(data)
    , m_pitch(size.width() * sizeof(RGBA32))
    , m_format(format)
{
}

GraphicsBitmap::GraphicsBitmap(Format format, const Size& size, MappedFile&& mapped_file)
    : m_size(size)
    , m_data((RGBA32*)mapped_file.pointer())
    , m_pitch(size.width() * sizeof(RGBA32))
    , m_format(format)
    , m_mapped_file(move(mapped_file))
{
}

Retained<GraphicsBitmap> GraphicsBitmap::create_with_shared_buffer(Format format, Retained<SharedBuffer>&& shared_buffer, const Size& size)
{
    return adopt(*new GraphicsBitmap(format, move(shared_buffer), size));
}

GraphicsBitmap::GraphicsBitmap(Format format, Retained<SharedBuffer>&& shared_buffer, const Size& size)
    : m_size(size)
    , m_data((RGBA32*)shared_buffer->data())
    , m_pitch(size.width() * sizeof(RGBA32))
    , m_format(format)
    , m_shared_buffer(move(shared_buffer))
{
}

GraphicsBitmap::~GraphicsBitmap()
{
    if (m_needs_munmap) {
        size_t size_in_bytes = m_size.area() * sizeof(RGBA32);
        int rc = munmap(m_data, size_in_bytes);
        ASSERT(rc == 0);
    }
    m_data = nullptr;
}

void GraphicsBitmap::set_mmap_name(const String& name)
{
    ASSERT(m_needs_munmap);
    size_t size_in_bytes = m_size.area() * sizeof(RGBA32);
    ::set_mmap_name(m_data, size_in_bytes, name.characters());
}