Function ObjectChangeInfo

src/newgrf/newgrf_act0_objects.cpp:76–200

* Define properties for objects * @param first Local ID of the first object. * @param last Local ID of the last object. * @param prop The property to change. * @param buf The property value. * @return ChangeInfoResult. */

 * @return ChangeInfoResult.
 */
static ChangeInfoResult ObjectChangeInfo(uint first, uint last, int prop, ByteReader &buf)
{
	ChangeInfoResult ret = CIR_SUCCESS;

	if (last > NUM_OBJECTS_PER_GRF) {
		GrfMsg(1, "ObjectChangeInfo: Too many objects loaded ({}), max ({}). Ignoring.", last, NUM_OBJECTS_PER_GRF);
		return CIR_INVALID_ID;
	}

	/* Allocate object specs if they haven't been allocated already. */
	if (_cur_gps.grffile->objectspec.size() < last) _cur_gps.grffile->objectspec.resize(last);

	for (uint id = first; id < last; ++id) {
		auto &spec = _cur_gps.grffile->objectspec[id];

		if (prop != 0x08 && spec == nullptr) {
			/* If the object property 08 is not yet set, ignore this property */
			ChangeInfoResult cir = IgnoreObjectProperty(prop, buf);
			if (cir > ret) ret = cir;
			continue;
		}

		switch (prop) {
			case 0x08: { // Class ID
				/* Allocate space for this object. */
				if (spec == nullptr) {
					spec = std::make_unique<ObjectSpec>();
					spec->views = 1; // Default for NewGRFs that don't set it.
					spec->size = OBJECT_SIZE_1X1; // Default for NewGRFs that manage to not set it (1x1)
				}

				/* Swap classid because we read it in BE. */
				uint32_t classid = buf.ReadDWord();
				spec->class_index = ObjectClass::Allocate(std::byteswap(classid));
				break;
			}

			case 0x09: { // Class name
				AddStringForMapping(GRFStringID{buf.ReadWord()}, [spec = spec.get()](StringID str) { ObjectClass::Get(spec->class_index)->name = str; });
				break;
			}

			case 0x0A: // Object name
				AddStringForMapping(GRFStringID{buf.ReadWord()}, &spec->name);
				break;

			case 0x0B: // Climate mask
				spec->climate = LandscapeTypes{buf.ReadByte()};
				break;

			case 0x0C: // Size
				spec->size = buf.ReadByte();
				if (GB(spec->size, 0, 4) == 0 || GB(spec->size, 4, 4) == 0) {
					GrfMsg(0, "ObjectChangeInfo: Invalid object size requested (0x{:X}) for object id {}. Ignoring.", spec->size, id);
					spec->size = OBJECT_SIZE_1X1;
				}
				break;