[nostalgia/core/studio] Add zoom support to TileSheetEditor

src/nostalgia/core/studio/tilesheetpixelgrid.cpp

@@ -7,6 +7,10 @@
 
 namespace nostalgia::core {
 
+void TileSheetGrid::setPixelSizeMod(float sm) noexcept {
+	m_pixelSizeMod = sm;
+}
+
 ox::Error TileSheetGrid::buildShader() noexcept {
 	const auto pixelLineVshad = ox::sfmt(VShad, glutils::GlslVersion);
 	const auto pixelLineFshad = ox::sfmt(FShad, glutils::GlslVersion);
@@ -92,11 +96,11 @@ void TileSheetGrid::setBufferObjects(const NostalgiaGraphic &img, glutils::Buffe
 	}
 }
 
-ImVec2 TileSheetGrid::pixelSize() noexcept {
+ImVec2 TileSheetGrid::pixelSize() const noexcept {
 	const auto [sw, sh] = ImGui::GetContentRegionAvail();
 	constexpr float ymod = 0.35f / 10.0f;
 	const auto xmod = ymod * sh / sw;
-	return {xmod, ymod};
+	return {xmod * m_pixelSizeMod, ymod * m_pixelSizeMod};
 }
 
 }