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#include "BMP.hpp"
#include <cstring>
#include <set>
#include "openvic-simulation/utility/Logger.hpp"
using namespace OpenVic;
BMP::~BMP() {
close();
}
bool BMP::open(fs::path const& filepath) {
reset();
file.open(filepath, std::ios::binary);
if (file.fail()) {
Logger::error("Failed to open BMP file \"", filepath, "\"");
close();
return false;
}
return true;
}
bool BMP::read_header() {
if (header_validated) {
Logger::error("BMP header already validated!");
return false;
}
if (!file.is_open()) {
Logger::error("Cannot read BMP header before opening a file");
return false;
}
file.seekg(0, std::ios::beg);
if (file.fail()) {
Logger::error("Failed to move to the beginning of the BMP file!");
return false;
}
file.read(reinterpret_cast<char*>(&header), sizeof(header));
if (file.fail()) {
Logger::error("Failed to read BMP header!");
return false;
}
header_validated = true;
// Validate constants
static constexpr uint16_t BMP_SIGNATURE = 0x4d42;
if (header.signature != BMP_SIGNATURE) {
Logger::error("Invalid BMP signature: ", header.signature, " (must be ", BMP_SIGNATURE, ")");
header_validated = false;
}
static constexpr uint32_t DIB_HEADER_SIZE = 40;
if (header.dib_header_size != DIB_HEADER_SIZE) {
Logger::error("Invalid BMP DIB header size: ", header.dib_header_size, " (must be ", DIB_HEADER_SIZE, ")");
header_validated = false;
}
static constexpr uint16_t NUM_PLANES = 1;
if (header.num_planes != NUM_PLANES) {
Logger::error("Invalid BMP plane count: ", header.num_planes, " (must be ", NUM_PLANES, ")");
header_validated = false;
}
static constexpr uint16_t COMPRESSION = 0; // Only support uncompressed BMPs
if (header.compression != COMPRESSION) {
Logger::error("Invalid BMP compression method: ", header.compression, " (must be ", COMPRESSION, ")");
header_validated = false;
}
// Validate sizes and dimensions
// TODO - image_size_bytes can be 0 for non-compressed BMPs
if (header.file_size != header.offset + header.image_size_bytes) {
Logger::error("Invalid BMP memory sizes: file size = ", header.file_size, " != ", header.offset + header.image_size_bytes,
" = ", header.offset, " + ", header.image_size_bytes, " = image data offset + image data size");
header_validated = false;
}
// TODO - support negative widths (i.e. horizontal flip)
if (header.width_px <= 0) {
Logger::error("Invalid BMP width: ", header.width_px, " (must be positive)");
header_validated = false;
}
// TODO - support negative heights (i.e. vertical flip)
if (header.height_px <= 0) {
Logger::error("Invalid BMP height: ", header.height_px, " (must be positive)");
header_validated = false;
}
// TODO - validate x_resolution_ppm
// TODO - validate y_resolution_ppm
// Validate colours
#define VALID_BITS_PER_PIXEL 1, 2, 4, 8, 16, 24, 32
#define STR(x) #x
static const std::set<uint16_t> BITS_PER_PIXEL { VALID_BITS_PER_PIXEL };
if (!BITS_PER_PIXEL.contains(header.bits_per_pixel)) {
Logger::error("Invalid BMP bits per pixel: ", header.bits_per_pixel, " (must be one of " STR(VALID_BITS_PER_PIXEL) ")");
header_validated = false;
}
#undef VALID_BITS_PER_PIXEL
#undef STR
static constexpr uint16_t PALETTE_BITS_PER_PIXEL_LIMIT = 8;
if (header.num_colours != 0 && header.bits_per_pixel > PALETTE_BITS_PER_PIXEL_LIMIT) {
Logger::error("Invalid BMP palette size: ", header.num_colours, " (should be 0 as bits per pixel is ", header.bits_per_pixel, " > 8)");
header_validated = false;
}
// TODO - validate important_colours
palette_size = header.bits_per_pixel > PALETTE_BITS_PER_PIXEL_LIMIT ? 0
// Use header.num_colours if it's greater than 0 and at most 1 << header.bits_per_pixel
: 0 < header.num_colours && header.num_colours - 1 >> header.bits_per_pixel == 0 ? header.num_colours
: 1 << header.bits_per_pixel;
const uint32_t expected_offset = palette_size * PALETTE_COLOUR_SIZE + sizeof(header);
if (header.offset != expected_offset) {
Logger::error("Invalid BMP image data offset: ", header.offset, " (should be ", expected_offset, ")");
header_validated = false;
}
return header_validated;
}
bool BMP::read_palette() {
if (palette_read) {
Logger::error("BMP palette already read!");
return false;
}
if (!file.is_open()) {
Logger::error("Cannot read BMP palette before opening a file");
return false;
}
if (!header_validated) {
Logger::error("Cannot read palette before BMP header is validated!");
return false;
}
if (palette_size == 0) {
Logger::error("Cannot read BMP palette - header indicates this file doesn't have one");
return false;
}
file.seekg(sizeof(header), std::ios::beg);
if (file.fail()) {
Logger::error("Failed to move to the palette in the BMP file!");
return false;
}
palette.resize(palette_size);
file.read(reinterpret_cast<char*>(palette.data()), palette_size * PALETTE_COLOUR_SIZE);
if (file.fail()) {
Logger::error("Failed to read BMP header!");
palette.clear();
return false;
}
palette_read = true;
return palette_read;
}
void BMP::close() {
if (file.is_open()) {
file.close();
}
}
void BMP::reset() {
close();
memset(&header, 0, sizeof(header));
header_validated = false;
palette_size = 0;
palette.clear();
pixel_data.clear();
}
int32_t BMP::get_width() const {
return header.width_px;
}
int32_t BMP::get_height() const {
return header.height_px;
}
uint16_t BMP::get_bits_per_pixel() const {
return header.bits_per_pixel;
}
std::vector<colour_t> const& BMP::get_palette() const {
if (!palette_read) {
Logger::warning("Trying to get BMP palette before loading");
}
return palette;
}
bool BMP::read_pixel_data() {
if (pixel_data_read) {
Logger::error("BMP pixel data already read!");
return false;
}
if (!file.is_open()) {
Logger::error("Cannot read BMP pixel data before opening a file");
return false;
}
if (!header_validated) {
Logger::error("Cannot read pixel data before BMP header is validated!");
return false;
}
file.seekg(header.offset, std::ios::beg);
if (file.fail()) {
Logger::error("Failed to move to the pixel data in the BMP file!");
return false;
}
const size_t pixel_data_size = get_width() * get_height() * header.bits_per_pixel / 8;
pixel_data.resize(pixel_data_size);
file.read(reinterpret_cast<char*>(pixel_data.data()), pixel_data_size);
if (file.fail()) {
Logger::error("Failed to read BMP pixel data!");
pixel_data.clear();
return false;
}
pixel_data_read = true;
return pixel_data_read;
}
std::vector<uint8_t> const& BMP::get_pixel_data() const {
if (!pixel_data_read) {
Logger::warning("Trying to get BMP pixel data before loading");
}
return pixel_data;
}
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