[nostalgia/core/studio] Break out TileSheetEditor application logic

src/nostalgia/core/studio/tilesheeteditormodel.cpp

@@ -0,0 +1,50 @@
+/*
+ * Copyright 2016 - 2022 Gary Talent (gary@drinkingtea.net). All rights reserved.
+ */
+
+#include <nostalgia/core/media.hpp>
+
+#include "tilesheeteditormodel.hpp"
+
+namespace nostalgia::core {
+
+TileSheetEditorModel::TileSheetEditorModel(Context *ctx, const ox::String &path) {
+	// build shaders
+	oxRequireT(img, readObj<NostalgiaGraphic>(ctx, path.c_str()));
+	m_img = std::move(*img);
+	oxThrowError(readObj<NostalgiaPalette>(ctx, m_img.defaultPalette).moveTo(&m_pal));
+}
+
+void TileSheetEditorModel::getFillPixels(bool *pixels, geo::Point pt, int oldColor) const noexcept {
+	const auto tileIdx = [this](const geo::Point &pt) noexcept {
+		return ptToIdx(pt, img().columns) / PixelsPerTile;
+	};
+	// get points
+	const auto leftPt = pt + geo::Point(-1, 0);
+	const auto rightPt = pt + geo::Point(1, 0);
+	const auto topPt = pt + geo::Point(0, -1);
+	const auto bottomPt = pt + geo::Point(0, 1);
+	// calculate indices
+	const auto idx = ptToIdx(pt, m_img.columns);
+	const auto leftIdx = ptToIdx(leftPt, m_img.columns);
+	const auto rightIdx = ptToIdx(rightPt, m_img.columns);
+	const auto topIdx = ptToIdx(topPt, m_img.columns);
+	const auto bottomIdx = ptToIdx(bottomPt, m_img.columns);
+	const auto tile = tileIdx(pt);
+	// mark pixels to update
+	pixels[idx % PixelsPerTile] = true;
+	if (!pixels[leftIdx % PixelsPerTile] && tile == tileIdx(leftPt) && m_img.pixels[leftIdx] == oldColor) {
+		getFillPixels(pixels, leftPt, oldColor);
+	}
+	if (!pixels[rightIdx % PixelsPerTile] && tile == tileIdx(rightPt) && m_img.pixels[rightIdx] == oldColor) {
+		getFillPixels(pixels, rightPt, oldColor);
+	}
+	if (!pixels[topIdx % PixelsPerTile] && tile == tileIdx(topPt) && m_img.pixels[topIdx] == oldColor) {
+		getFillPixels(pixels, topPt, oldColor);
+	}
+	if (!pixels[bottomIdx % PixelsPerTile] && tile == tileIdx(bottomPt) && m_img.pixels[bottomIdx] == oldColor) {
+		getFillPixels(pixels, bottomPt, oldColor);
+	}
+}
+
+}