Method load_image

compat/ico_loader.cpp:306–376

}

Error ImageLoaderICO::load_image(Ref<Image> p_image, Ref<FileAccess> p_fileaccess, BitField<ImageFormatLoader::LoaderFlags> p_flags, float p_scale) {
	ERR_FAIL_COND_V_MSG(p_fileaccess.is_null(), ERR_INVALID_PARAMETER, "ImageLoaderICO: Invalid FileAccess.");

	// Read ICONDIR header
	uint16_t reserved = p_fileaccess->get_16();
	ERR_FAIL_COND_V_MSG(reserved != 0, ERR_FILE_UNRECOGNIZED, "ImageLoaderICO: Invalid ICO file (reserved field should be 0).");

	uint16_t icon_type = p_fileaccess->get_16();
	ERR_FAIL_COND_V_MSG(icon_type != 1, ERR_FILE_UNRECOGNIZED, "ImageLoaderICO: Invalid ICO file (type should be 1 for ICO).");

	uint16_t icon_count = p_fileaccess->get_16();
	ERR_FAIL_COND_V_MSG(icon_count == 0, ERR_FILE_CORRUPT, "ImageLoaderICO: ICO file contains no images.");

	// Read all icon entries
	Vector<IconEntry> entries;
	entries.resize(icon_count);

	int best_index = -1;
	int best_size = -1;

	for (uint16_t i = 0; i < icon_count; i++) {
		IconEntry &entry = entries.write[i];
		entry.width = p_fileaccess->get_8();
		entry.height = p_fileaccess->get_8();
		entry.colors = p_fileaccess->get_8();
		entry.reserved = p_fileaccess->get_8();
		entry.planes = p_fileaccess->get_16();
		entry.bits_per_pixel = p_fileaccess->get_16();
		entry.image_size = p_fileaccess->get_32();
		entry.image_offset = p_fileaccess->get_32();

		// Handle 0 width/height meaning 256
		uint16_t actual_width = (entry.width == 0) ? 256 : entry.width;
		uint16_t actual_height = (entry.height == 0) ? 256 : entry.height;

		// Select best image: prefer larger images (ICO files typically contain multiple sizes)
		int size = actual_width * actual_height;
		if (best_index == -1 || size > best_size) {
			best_index = i;
			best_size = size;
		}
	}

	ERR_FAIL_COND_V_MSG(best_index == -1, ERR_FILE_CORRUPT, "ImageLoaderICO: Could not select an image from ICO file.");

	const IconEntry &selected_entry = entries[best_index];

	// Read the selected image data
	ERR_FAIL_COND_V_MSG(selected_entry.image_offset + selected_entry.image_size > (uint32_t)p_fileaccess->get_length(),
			ERR_FILE_CORRUPT, "ImageLoaderICO: Image data offset exceeds file size.");

	Vector<uint8_t> image_data;
	image_data.resize(selected_entry.image_size);

	uint64_t saved_pos = p_fileaccess->get_position();
	p_fileaccess->seek(selected_entry.image_offset);
	p_fileaccess->get_buffer(image_data.ptrw(), selected_entry.image_size);
	p_fileaccess->seek(saved_pos);