banan-os/userspace/image/Image.cpp

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#include "Image.h"
#include "Netbpm.h"
#include <fcntl.h>
#include <stdlib.h>
#include <sys/framebuffer.h>
#include <sys/mman.h>
BAN::UniqPtr<Image> Image::load_from_file(BAN::StringView path)
{
int fd = -1;
if (path.data()[path.size()] == '\0')
{
fd = open(path.data(), O_RDONLY);
}
else
{
char* buffer = (char*)malloc(path.size() + 1);
if (!buffer)
{
perror("malloc");
return {};
}
memcpy(buffer, path.data(), path.size());
buffer[path.size()] = '\0';
fd = open(path.data(), O_RDONLY);
free(buffer);
}
if (fd == -1)
{
perror("open");
return {};
}
struct stat st;
if (fstat(fd, &st) == -1)
{
perror("fstat");
close(fd);
return {};
}
if (st.st_size < 2)
{
fprintf(stderr, "invalid image (too small)\n");
close(fd);
return {};
}
void* addr = mmap(nullptr, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
if (addr == MAP_FAILED)
{
perror("mmap");
close(fd);
return {};
}
BAN::UniqPtr<Image> image;
uint16_t u16_signature = *reinterpret_cast<uint16_t*>(addr);
switch (u16_signature)
{
case 0x3650:
case 0x3550:
case 0x3450:
case 0x3350:
case 0x3250:
case 0x3150:
if (auto res = load_netbpm(addr, st.st_size); res.is_error())
fprintf(stderr, "%s\n", strerror(res.error().get_error_code()));
else
image = res.release_value();
break;
default:
fprintf(stderr, "unrecognized image format\n");
break;
}
munmap(addr, st.st_size);
close(fd);
return image;
}
bool Image::render_to_framebuffer()
{
int fd = open("/dev/fb0", O_RDWR);
if (fd == -1)
{
perror("open");
return false;
}
framebuffer_info_t fb_info;
if (pread(fd, &fb_info, sizeof(fb_info), -1) == -1)
{
perror("pread");
close(fd);
return false;
}
ASSERT(BANAN_FB_BPP == 24 || BANAN_FB_BPP == 32);
size_t mmap_size = fb_info.height * fb_info.width * BANAN_FB_BPP / 8;
void* mmap_addr = mmap(nullptr, mmap_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (mmap_addr == MAP_FAILED)
{
perror("mmap");
close(fd);
return false;
}
uint8_t* u8_fb = reinterpret_cast<uint8_t*>(mmap_addr);
for (uint64_t y = 0; y < BAN::Math::min<uint64_t>(height(), fb_info.height); y++)
{
for (uint64_t x = 0; x < BAN::Math::min<uint64_t>(width(), fb_info.width); x++)
{
u8_fb[(y * fb_info.width + x) * BANAN_FB_BPP / 8 + 0] = m_bitmap[y * width() + x].r;
u8_fb[(y * fb_info.width + x) * BANAN_FB_BPP / 8 + 1] = m_bitmap[y * width() + x].g;
u8_fb[(y * fb_info.width + x) * BANAN_FB_BPP / 8 + 2] = m_bitmap[y * width() + x].b;
if constexpr(BANAN_FB_BPP == 32)
u8_fb[(y * fb_info.width + x) * BANAN_FB_BPP / 8 + 3] = m_bitmap[y * width() + x].a;
}
}
if (msync(mmap_addr, mmap_size, MS_SYNC) == -1)
{
perror("msync");
munmap(mmap_addr, mmap_size);
close(fd);
return false;
}
munmap(mmap_addr, mmap_size);
close(fd);
return true;
}