thread pool update + refactor

src/coders/imageio.cpp

@@ -0,0 +1,49 @@
+#include "imageio.h"
+
+#include "png.h"
+#include "../graphics/core/ImageData.h"
+
+#include <filesystem>
+#include <functional>
+#include <unordered_map>
+
+namespace fs = std::filesystem;
+
+using image_reader = std::function<ImageData*(const std::string&)>;
+using image_writer = std::function<void(const std::string&, const ImageData*)>;
+
+static std::unordered_map<std::string, image_reader> readers {
+    {".png", png::load_image},
+};
+
+static std::unordered_map<std::string, image_writer> writers {
+    {".png", png::write_image},
+};
+
+bool imageio::is_read_supported(const std::string& extension) {
+    return readers.find(extension) != readers.end();
+}
+
+bool imageio::is_write_supported(const std::string& extension) {
+    return writers.find(extension) != writers.end();
+}
+
+inline std::string extensionOf(const std::string& filename) {
+    return fs::u8path(filename).extension().u8string();
+}
+
+std::unique_ptr<ImageData> imageio::read(const std::string& filename) {
+    auto found = readers.find(extensionOf(filename));
+    if (found == readers.end()) {
+        throw std::runtime_error("file format is not supported (read): "+filename);
+    }
+    return std::unique_ptr<ImageData>(found->second(filename));
+}
+
+void imageio::write(const std::string& filename, const ImageData* image) {
+    auto found = writers.find(extensionOf(filename));
+    if (found == writers.end()) {
+        throw std::runtime_error("file format is not supported (write): "+filename);
+    }
+    return found->second(filename, image);
+}