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https://github.com/LadybirdBrowser/ladybird.git
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4e451c1e92
This prevents flicker and looks rather good. The main downside is that resizing gets even more sluggish. That's the price we pay for now.
83 lines
2.4 KiB
C++
83 lines
2.4 KiB
C++
#include "GraphicsBitmap.h"
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#include <sys/mman.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <stdio.h>
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Retained<GraphicsBitmap> GraphicsBitmap::create(Format format, const Size& size)
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{
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return adopt(*new GraphicsBitmap(format, size));
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}
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GraphicsBitmap::GraphicsBitmap(Format format, const Size& size)
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: m_size(size)
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, m_pitch(size.width() * sizeof(RGBA32))
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, m_format(format)
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{
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size_t size_in_bytes = size.area() * sizeof(RGBA32);
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m_data = (RGBA32*)mmap(nullptr, size_in_bytes, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, 0, 0);
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ASSERT(m_data && m_data != (void*)-1);
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set_mmap_name(m_data, size_in_bytes, String::format("GraphicsBitmap [%dx%d]", width(), height()).characters());
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m_mmaped = true;
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}
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Retained<GraphicsBitmap> GraphicsBitmap::create_wrapper(Format format, const Size& size, RGBA32* data)
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{
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return adopt(*new GraphicsBitmap(format, size, data));
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}
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RetainPtr<GraphicsBitmap> GraphicsBitmap::load_from_file(Format format, const String& path, const Size& size)
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{
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int fd = open(path.characters(), O_RDONLY, 0644);
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if (fd < 0) {
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dbgprintf("open(%s) got fd=%d, failed: %s\n", path.characters(), fd, strerror(errno));
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perror("open");
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return nullptr;
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}
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auto* mapped_data = (RGBA32*)mmap(nullptr, size.area() * 4, PROT_READ, MAP_SHARED, fd, 0);
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if (mapped_data == MAP_FAILED) {
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int rc = close(fd);
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ASSERT(rc == 0);
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return nullptr;
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}
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int rc = close(fd);
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ASSERT(rc == 0);
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auto bitmap = create_wrapper(format, size, mapped_data);
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bitmap->m_mmaped = true;
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return bitmap;
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}
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GraphicsBitmap::GraphicsBitmap(Format format, const Size& size, RGBA32* data)
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: m_size(size)
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, m_data(data)
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, m_pitch(size.width() * sizeof(RGBA32))
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, m_format(format)
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{
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}
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Retained<GraphicsBitmap> GraphicsBitmap::create_with_shared_buffer(Format format, Retained<SharedBuffer>&& shared_buffer, const Size& size)
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{
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return adopt(*new GraphicsBitmap(format, move(shared_buffer), size));
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}
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GraphicsBitmap::GraphicsBitmap(Format format, Retained<SharedBuffer>&& shared_buffer, const Size& size)
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: m_size(size)
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, m_data((RGBA32*)shared_buffer->data())
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, m_pitch(size.width() * sizeof(RGBA32))
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, m_format(format)
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, m_shared_buffer(move(shared_buffer))
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{
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}
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GraphicsBitmap::~GraphicsBitmap()
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{
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if (m_mmaped) {
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int rc = munmap(m_data, m_size.area() * 4);
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ASSERT(rc == 0);
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}
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m_data = nullptr;
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}
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