[nostalgia/studio] Get save working

src/nostalgia/core/studio/tilesheeteditormodel.cpp

@@ -2,6 +2,8 @@
  * Copyright 2016 - 2022 Gary Talent (gary@drinkingtea.net). All rights reserved.
  */
 
+#include <ox/claw/write.hpp>
+
 #include <nostalgia/core/media.hpp>
 
 #include "tilesheeteditormodel.hpp"
@@ -9,6 +11,8 @@
 namespace nostalgia::core {
 
 TileSheetEditorModel::TileSheetEditorModel(Context *ctx, const ox::String &path) {
+	m_ctx = ctx;
+	m_path = path;
 	oxRequireT(img, readObj<TileSheet>(ctx, path.c_str()));
 	m_img = *img;
 	oxThrowError(readObj<Palette>(ctx, m_img.defaultPalette).moveTo(&m_pal));
@@ -46,6 +50,12 @@ void TileSheetEditorModel::ackUpdate() noexcept {
 	m_updated = false;
 }
 
+ox::Error TileSheetEditorModel::saveFile() noexcept {
+	oxRequire(buff, ox::writeClaw(&m_img));
+	oxReturnError(m_ctx->rom->write(m_path.c_str(), buff.data(), buff.size()));
+	return m_ctx->assetManager.setAsset(m_path, m_img).error;
+}
+
 void TileSheetEditorModel::getFillPixels(bool *pixels, const geo::Point &pt, int oldColor) const noexcept {
 	const auto tileIdx = [this](const geo::Point &pt) noexcept {
 		return ptToIdx(pt, img().columns()) / PixelsPerTile;